How to make a diamond grinding wheel wear slower reasons

Diamond Wheel in our daily lives has become so widespread, that how can you wear diamond wheel is often slow, you know? If you do not know to give with Xiaobian look at it.
Select the diamond grinding wheel hardness general principle is: the processing of soft metal, in order not to make premature loss of abrasive, then use a hard wheel. Wear resistance and long life. Diamond grinding wheel ratio up to 3500-5500, a hundred times higher than normal corundum grinding wheel, 3-5 times higher than ordinary diamond wheel. When  GUSHI diamond polishing tools processing hard metal, in order to make timely blunt grit off, thereby exposing new abrasive grains with sharp edges (ie, self-sharpening), use a soft wheel. Or because the soft material in the grinding wheel abrasive wear is slow work, without departing too early; latter is because the grinding of hard materials, abrasive wear of the grinding wheel work faster, require faster updated. High efficiency, good overall economic efficiency. Grinding sharp, small grinding force, diamond grinding wheel dressing cycle length, less the amount of dressing, long replacement time; long life cycle, grinding ratio, getting a better economy, use good shape retention, without regular Replace the wheel and wheel dressing, saving time and improving working conditions conducive to machining operations. In the grinding force and grinding conditions are low speed after using diamond grinding wheel, and its distribution on the surface of a large number of angular, consistent diamond abrasive wear reflective facets. This is GUSHI circular blades  mechanical wear due to mechanical friction and superhard abrasive diamond material produced. This wear is gradual, with the amount of wear of the abrasive grinding stroke length proportional relationship.
At higher temperatures the grinding conditions grinding zone, diamond grit diamond wheel on and graphite oxidation and loss. According to the nature of the diamond understood, oxidation, depending on the degree of graphitization of the diamond abrasive crystals integrity, and the degree of graphitization and also on the crystal orientation. Good crystal perfection diamond abrasive, oxidation, low degree of graphitization loss.
On the part of diamond grit diamond wheel surface localized fracture and fragmentation, resulting in whole shedding. Cleavage  GUSHI stone drill bits occurs diamond abrasive damage. Since the crystal cleavage plane of rupture was determined by the crystal structure of factor 7 bond type, intensity and distribution of the generated, which is often generated along the surface of the orientation strength of the final bond. Random distribution of grains to determine their cleavage occurred damage is inevitable.

How to replace the worn drill

After some time working in the underground drill , drill scraper blade diameter becomes smaller, shorter, blunt , rock crushing capacity will become weak , slowing progress . Tags: geological coring drill concave three wings drill
Drill a certain time after the underground work , scraper blade diameter drill bit smaller , shorter, blunt , rock Crankshaft Grinding  crushing capacity will become weak , slow down progress ; cone bit due to the erosion of tooth wear , bearing damage , can cause cone rotation is not flexible or cone stuck, the torque increases, if not promptly fall from the cone accidents will happen ; diamond drill due to heterogeneity caused by the formation of PDC drill bits crack occurred on , off, off Similarly the drilling footage slower. To speed up the pace of drilling wells whole , must be replaced with the old drill , and drill a few hundred meters to several kilometers in the underground , how to replace the drill bit drilling workers do ?
When drilling rig power driven  hone tool  turntable, kelly , drill and drill bit rotates through the instrument to observe the work of the underground drill rig floor , after the comprehensive judgment, if deemed drill has been worn , replace the drill bit must immediately stop drilling . After stopping drilling, drilling fluid circulation to maintain a period of time , the purpose is to adjust the good performance of the drilling fluid , and the suspension in drilling cuttings out of the ground, the cycle of the new borehole wall remained stable , while also to carry out routine checks on drilling equipment . Workers drilling derrick crane use on the traveling block and hook, according to the height of the mast by column ( generally consisting of two or three drill ) from the entire drill string from the well . After the drill column in the order from the discharge in the derrick while the drill string downhole stone polishing pads  proposed , to use a pump to keep the annular space drilling infusion fluids , the aim of maintaining the liquid level does not fall within the wellbore so that a wellbore pressure to balance the formation pressure to prevent borehole collapse or underground formation fluids into the wellbore . Meanwhile, we should pay particular attention to the reduced diameter borehole drilling may occur card , the operator should be strictly controlled to improve speed. The entire drill wellbore , drill collars from the rear , while the need to replace the drill bit will play out , workers remove the old drill press drill fitted with a new column under the original order can be restored to the wells after drilling

Relationship between the wheel and the substrate

Wheel base affects their quality and use of molding precision level , today ,  here with you to talk about diamond grinding wheel and the substrate relationship , hoping to give you help.
As with the characteristics of diamond abrasive ( high hardness , high compressive strength , good wear concrete diamond blades  resistance ) , the diamond abrasive in grinding become hard and brittle materials and carbide grinding ideal tool not only high efficiency, precision high, and good roughness , abrasive consumption, long life, but can also improve working conditions . Diamond diamond abrasive wheel features include the type, size, concentration , and geometry of binders . It is widely used for general abrasive difficult to process low iron content of the metal and non-metallic brittle materials , such as tungsten carbide ( carbide ) , alumina ceramic , optical glass , agate gemstone , semiconductor materials , stone , ceramics, ferrite body , hard and brittle materials such as semiconductor materials and metallic materials, grinding , carbide materials, shape Edge 2000 Pads  processing , electrolytic grinding, and grinding center drill with diamond grinding other heavy-duty cutting , grinding abrasion with good , high efficiency, long life characteristics .
Therefore, the collective choice of diamond is very important , everyone in the selection process must be careful . Our resin grinding wheel should have some preliminary understanding, but it should still be enough to understand the properties of a comprehensive , how  diamond cup wheels in everyday use will maximize the efficiency of resin grinding wheel , let us work together to understand :
First, you know, resin grinding wheel is made ​​of resin grinding wheel, such as phenolic , epoxy, polyurethane , polyvinyl alcohol, resin grinding wheel is a high strength, can strengthen the wheel to add fiber mesh and steel , such as our cutting discs, grinding, now most of us are not waterproof resin grinding wheel abrasive grinding fluid could not be used , of course, need to add some resin grinding wheel grinding fluids , such as epoxy , resin grinding wheel is a good finish, not easy to burn currently used in the resin grinding wheel cutting disc, double-end , heavy duty wheels, polishing wheels and so on.

Diamond Wheel introduce a variety of classification

Diamond grinding wheel by binding agents can be divided into: resin bond diamond wheel ; vitrified diamond grinding wheel ; metal bond diamond wheel ( bronze bond diamond wheel ) diamond grinding wheel according  industrial saw blades to the production process can be divided into: sintered diamond wheel ( resin bond diamond grinding wheel ; vitrified diamond grinding wheel ; metal bond diamond wheel ) ; electroplated diamond grinding wheel ; brazed diamond wheel . Diamond grinding wheel can be divided according to : diamond with diamond grinding wheel ; grinding carbide with diamond wheel ( diamond cutter grinding wheel ) ; PDC with diamond grinding wheel ; coreless grinder with a diamond centerless grinding wheel ; grinding ceramics with wood drill bits  a diamond wheel ; cutting diamond wheel ( also known as diamond cutting discs ) ; diamond saw .
Diamond grinding wheel by the appearance or shape can be divided into : Parallel grinding wheel ; cylindrical grinding wheel ; cup wheels ; Wheel Bowl ; disc wheel ; grinding wheel ; disc and so on.
First we have to consider its abrasive texture, iron roller, rubber roller , copper roller and so on. Do not have to be the same as the material pairing with the corresponding wheel .
Second, we have to consider is  wet tile saw the size of choice, when you want to select coarse grained diamond wheels and vice versa , when faced with ultra- fine grinding wheel to use powder .
Finally also take into account the hardness , wheel wear fast, then you want to do the following:
One , trying to improve its wheel speed
2 , the pressure roller will have to reduce the speed aspect
3, to improve longitudinal feed speed

Factors size diamond saw blade

The grit size used in the 30/35 ~ 60/80 range. The more hard rock,

should be selected with a finer granularity. Because at the same

pressure conditions, the more detailed the more sharp diamond, cut hard

rock in favor. In addition, the general requirements of a large-diameter

blade cutting efficiency is high, with the  coarser particle size should

be selected, for example, 30/40, 40/50; small-diameter blade cutting

efficiency is low, requires smooth  green concrete blades rock cutting section, preferably to a

smaller particle size, such as 50/60, 60/80.
Segment concentration
The so-called diamond concentration, the diamond in the working layer is

the carcass in the density distribution (i.e. contained within the unit

area weight of the diamond). "Norms" provides work per cubic centimeter

of the matrix containing 4.4 kt diamond, the concentration of 100%,

including 3.3 kt diamond, the concentration was 75%. Volume

concentration of said agglomerates in the volume occupied by the number

of diamond and provides that when the volume of the total volume of the

diamond 1/4 concentration of 100%. Increasing the concentration of

diamond is expected to extend the life of the blade, because of the

increased concentration of each piece of diamond is reduced, the average

cutting force suffered. However, increasing concentrations will increase

the cost of the blade, so there is concrete core bits  a concentration of the most

economical, and the concentration increases with the cutting rate.
Blade hardness
Generally, the higher the hardness binding agents, the stronger its wear

resistance. Thus, when a large rock abrasive cutting, the bonding agent

should be high hardness; when the cutting of soft rock material, the

hardness of the binding agent should be low; when large and abrasive

cutting hard rock, the binding agent should be moderate hardness .
Effect
Diamond saw blades in the process of cutting stone, will be centrifugal

force, cutting power, cutting hot alternating load effect.
Because force and temperature effects caused by diamond saw blade

grinding breakage.
Force effects: In the cutting process, the blade subject to axial force

and tangential force. Because there is  wood band saw blades in the circumferential direction

and the radial force, in the axial direction so that the blade wavy dish

in radial direction. Both can cause deformation of the rock section is

not flat, stone wasted, sawing noise, vibration intensified, resulting

in diamond caking early damage, reduced blade life. +++

Diamond tool materials species classification

Synthetic polycrystalline diamond (PCD) and synthetic polycrystalline diamond and carbide composite blade (PCD / CC)
PCD is at high temperature ( about 1800 ℃), pressure (5 ~ 6MPa) , the use of cobalt and other metal binding agent to a  oncrete crack chaser number of polycrystalline diamond crystal powder polycrystalline material , although slightly lower than the hardness of a single crystal diamond , but it is randomly oriented diamond grains polymerization , is isotropic , as can be arbitrarily oriented cutting tool sharpening , no natural diamond that must be selected as the best cleavage plane as a rake . In cutting, the cutting edge is very sensitive for accidental damage , wear resistance is also strong , long stay sharp cutting edge , can be used when machining high cutting speed and larger cutting depth ( to eat deep ) , life concrete core bits  is generally higher than the WC-based cemented carbide cutting tools 10 to 500 times , and because the metal binding agent PCD has conductivity , making PCD easy to cut to shape , and is a rich source of raw materials , the price is only a few tenth of natural diamond a fraction of the ten have become traditions WC-based cemented carbide cutting tools , high-performance alternatives.
PCD inserts to improve the toughness and weldability in the cemented carbide substrate , sintered or pressed on the surface of 0.5 ~ 1mm thick layer of the composition of PCD diamond composite blade (PCD / CC). PCD / CC welding or machine folder available way of making knives. Due to its good weldability , regrinding easy , low cost, and polishing pads for granite  therefore widely used. Hereupon , PCD and PCD / CC sharp cutting edge of the tool and are not as good surface quality single crystal diamond , while its workability is poor, the grinding ratio is small , it is difficult according to the geometry of any shape head , still not easy to manufacture with chipbreakers indexable end mills and other geometric shapes and complex products.
CVD diamond
CVD diamond is a diamond material of high wear resistance of pure , non- binding agent , which is at low pressure (<0.1MPa) prepared under . CVD diamond films are coated CVD (CD) and CVD thick (TFD) forms.
CD is a CVD ( chemical vapor deposition ) process , the carbide substrate ( K type alloy used ) is deposited to a thickness of about 10 ~ 30μm, composed of a polycrystalline diamond film is made .

Speed ​​Cutting Tools Introduction

 Since , and friction will no longer be a major source of cutting heat; same as cutting speed, flank at the elastic tile saw blade  deformation of the workpiece material to keep up with the deformation rate gradually reduced cutting speed, flank friction and thus also reduced, thereby to reduce cutting forces and heat generation beneficial effect. Therefore, in high-speed cutting, the main cutting heat will be derived chips, the temperature rise of the workpiece and the tool are very small, high-speed cutting is also known as "cold cutting." The high-speed machining We usually recommend a new interface standard called HSK. HSK tool by the German Institute of Aachen granite polishing pads  University specifically for the development of new high-speed machine tool - machine interface, and formed a tool for automatic and manual tool change, the central cooling and face cooling, ordinary type and compact 6 kinds of forms . HSK is a small taper (1:10) short hollow taper shank, tapered at the same time when using the contact face and to form a high contact stiffness. After analysis, although HSK spindle connected to the high-speed rotation, will also expand, but still able to maintain a good contact, rigidity of the connection speed of the interface is not affected.

promising cutting manufacturing machined blade

Slitter blade is high carbon tool steel manufacturing overall, the allowable cutting speed is about 5 m / min.
In the use of alloy tool steel, slitting machine blade cutting speed progress to about 8 m / min, using high-speed steel, and  wet saw blades more than twice the progress to the use of carbide, the progress of high-speed steel off than with more than twice the machining the workpiece surface quality and dimensional accuracy greatly improved.Because the price of high-speed steel and carbide is more expensive, slitting machine blade thrown welding and mechanical clamping structure.
Slitting machine machinery manufacturing  concrete ring saw top blade is used cutting tools, also known as circular cutting blade.
The outer surface of the processing of various tools, including turning, planing, milling cutters, broaches and rasp outer surfaces, etc.; hole cutting tools, including drills, reamers, boring tools, reamers and the inner surface broaches, etc.; thread processing tools, including taps, dies, automatic opening and closing of thread cutting head, thread  hss drill bits turning and thread milling cutters; gear cutting tools, including hobs, shaper cutters, shaving cutters, bevel gear cutting tools, etc.; interception tools, including inserts tooth circular saw blades, band saw, bow saw, cut off saw milling turning and so on. Late Warring States period (third century BC), because grasp carburizing technology, made of copper tools.

diamond abrasive and filler mixed in advance

Diamond grinding wheel used more widely , mainly for grinding or cutting , then you know how to process diamond wheel is made ​​of it ? Here we introduce a simple method for processing diamond wheel :
Prior and diamond abrasive fillers , these fillers can be salts, glass beads or magnetic particles. After sds plus drill bits  bonding , 20% the thickness of the filler particles are bonded by a metal binding agent , these fillers were used in addition to the following methods : dissolution method , sublimation method or magnetic method . This method of diamond abrasive filler particle size and particle size roughly the same amount of filler to make the diamond abrasive work surface to achieve the required concentration . The disadvantage of these methods is complicated in addition to the wet saw blades  filler , require special set of methods .
In addition to the filler is a relatively simple method using the spherical filler particles, the surface is smooth, a metal binding agent is first deposited diamond abrasive grains having a thickness of 20% of the height , and the filler brush with a brush , and finally continue the metal binding agent is deposited to predetermined thickness , use of this method to different metal bonded surface roughness and shape of the particles of different capacities of the gripping effect, the drawback is that  concrete cutting blade the diamond abrasive particle size of the filler particle size rather , after bonding and thus in the same plane, with the mechanical in addition to the packing method , there may give some diamond abrasive brush together , especially those close to equal area like shape of the particles , smooth surface of the particles .

diamond abrasive and filler mixed in advance

Diamond grinding wheel used more widely , mainly for grinding or cutting , then you know how to process diamond wheel is made ​​of it ? Here we introduce a simple method for processing diamond wheel :
Prior and diamond abrasive fillers , these concrete ring saw  fillers can be salts, glass beads or magnetic particles. After bonding , 20% the thickness of the filler particles are bonded by a metal binding agent , these fillers were used in addition to the following methods : dissolution method , sublimation method or magnetic method . This method of diamond abrasive filler particle size and particle size roughly the same amount of filler to make the diamond abrasive work surface to achieve the required concentration . The disadvantage of these methods is complicated in  tile cutting blades addition to the filler , require special set of methods .
In addition to the filler is a relatively simple method using the spherical filler particles, the surface is smooth, a metal binding agent is first deposited diamond abrasive grains having a thickness of 20% of the height , and the filler brush with a brush , and finally continue the metal binding agent is deposited to predetermined thickness , use of this method to different metal bonded surface roughness and shape of the particles of different capacities of the gripping effect, the drawback is that the diamond abrasive particle  concrete saws size of the filler particle size rather , after bonding and thus in the same plane, with the mechanical in addition to the packing method , there may give some diamond abrasive brush together , especially those close to equal area like shape of the particles , smooth surface of the particles .

diamond blade innovation and transformation Discussion

Make diamond segment in this industry for a long time, so now of what the diamond blade innovation and transformation. I personally think that diamond segments and industries associated with this diamond tool manufacturer  particular the rapid development in recent years, momentum and full of various manufacturers are vying to launch their new products.Said that the current good momentum of development, but as a vendor should have sense of urgency. Restructuring and adjustment measures is particularly important. But also for the industry to do more of the abyss development and lay a solid foundation.Cutting tool material has been entered in the development of the  cutting wheels times represnted by cemented carbide and high speed steel, carbide has better performance and higher cutting efficiency, which, together with the hard material, is to achieve efficient processing of modern cutting technology an important guarantee. At present, the proportion of carbide cutting tools up to 40%, far below the level of industrialized countries, has seriously hampered our tool to improve the overall level of product. Not a good tool material, any innovation and cutting tool technology advances are lack of necessary physical infrastructure. From the fundamental solution to this circular blades  problem will involve the adjustment of industrial structure, accelerate research and development with a capacity of carbide materials and tool production base building process, the rapid increase in carbide cutting tools in the proportion of all tools.

on dry cutting diamond tool Precautions

The current tool materials, such as new carbide, ceramic, CBN and PCBN and other high-temperature wear performance sufficient, able to dry cutting conditions.
  Dry cutting tool materials must have excellent hot hardness and wear resistance as to be effective to withstand  dry pads high temperatures during the cutting process; low friction coefficient, in order to reduce the tool and the chip and suppressing the friction between the surface temperature of the cutting rise. To implement the requirements of the tool dry cutting, it is necessary for the tool coating, is an important way to improve tool performance. In a robust surface coating of the tool base body and  hole saw blades wear resistant materials are very high, so that the cutting tool and the chip in the process of increase of a thermal barrier between, to prevent heat transfer to the tool base body decreases Tool wear and heat generation. The tool geometry, the dry cutting tool design should strive to follow the "low cutting temperature" design principles, the tool must be designed so  flap wheels that the processing structure of the heat generated in the process as little as possible, that the tool structure should strive to achieve low cutting forces and low friction.

performance of cutting tool materials - metal-ceramic

Cermet (Cermet), also known as titanium-based alloy (also called it as "porcelain gold", "Tao Jin," etc.), it has excellent mechanical properties and high temperature performance, as its name implies it, has both ceramic (Ceramics) materials with high hardness, but dry polishing pads  also has a metal (Metal) material strength and toughness, and the price is relatively cheap. For a long time, cermet cutting tool materials applications as far as widespread as other similar carbide. In recent years, metal ceramic tool materials development and application of gradually be taken seriously, also expanded its scope of application. 2 Performance analysis and comparison of cermet
Cermet sintered material with other commonly used - carbide and ceramic, the main chemical composition, temperature performance, and other mechanical and physical properties.
Cermet have the following performance characteristics.
High hardness and high temperature hardness
Tool flank wear mainly by friction between the tool and the workpiece caused by the relative motion, and the tool is directly related to the hardness and high-temperature hardness. Metal ceramic blade, high hardness, good red hardness, so then flank wear better. High hardness but also improve the wear resistance of the tool rake face an important factor.
High surface free energy of the low
Materials, surface free energy and its enthalpy, surface tension, and so on, is the characterization of surface properties of materials based on indicators, which can characterize the  sds drill bits material surface chemical stability under high temperature conditions, the surface free energy of the negative material, the greater the more stable chemical properties. Surface free energy value is calculated as DG DG = nu ∫ w dE dr
2 l0 dr
Where: E - interatomic potential
l0 - stable union state atomic spacing
nu - material damage cracking unit area required to pull a combination of atoms
r - the distance between atoms
Cutting steel, the tool flank wear in front of the main form of crater wear, the wear rate of the tool material chemical stability under high temperature, molten material into the tool material in the iron solubility of other closely related. As cermet surface free energy, into the molten iron solubility and diffusion reaction between materials is lower than cemented carbide, cermet tool rake face so crater wear resistance than the diamond discs  ability carbide.
The lower surface free energy (DG negative large), better chemical stability, materials and the stronger the antioxidant capacity. Tool wear occurs mainly in the boundary depth of cut at the boundary in contact with air, where the oxidation-shaped groove is formed easily intense wear. Cermet superior antioxidant properties of carbide. Figure 3 shows the NX33 P10 carbide cermet tools and the tool to cut the workpiece under the same processing conditions due to differences in tool boundary wear surface quality differences. The figure shows the boundary cermet tool wear, good surface quality; boundary carbide tool wear and poor surface quality.

red granite plate production processes and points to note

Granite is a volcanic lava from the under considerable pressure in a molten state to the granite surface crust uplift, magma is not ejected the ground, and slowly cooled and solidified in the sds drill bits  ground structure formed after the rock, a Acid plutonic igneous rock types, are igneous rocks. Igneous, also called acid crystals plutonic igneous rock is the most widely distributed as a rock, its composition of silica-based, accounting for about 65% -75%.
Benefits include granite features high load resistance, compressive strength and good ductility grinding, granite very easy to cut and shape, you can create a thin slab, etc. In short, granite with superior endurance capacity.
Granite red plate production process and technology:
First of ferric chloride dissolved in water, and add a small amount of a catalyst made of stain.
Then put into granite and edge polishing pads  completely immersed in the staining solution.
After a certain time in the soaking removed for cleaning, drying, color is obtained after red granite.
(Note soaking time should be according to Stone, color, water absorption, stone clearance and so different to set)
Manufacturing production process should pay attention to the main points:
Color concentration: Different concentrations to get different color effects, the production should look at the actual case may be, the general concentration of 20% for the best.
Soaking time: to have tile cutting blades  enough time to good coloring short time, but the time is too long the job efficiency is not high. Generally take 3-4 hours as well.
Color liquid PH value: PH value is too large and too small right after the color change and gloss granite color is not good, and generally two for the best.
Drying temperature: generally choose 200-250 ℃ (Celsius) is appropriate.
Drying time: usually about 2 hours.

main cutting diamond tool cutting edge orthogonal planes

In the main cutting diamond tool cutting edge perpendicular to the plane (OO) the angle measurement
(1) the rake angle of the rake face and go angle between the base surface. Parallel to this flank and the sand paper  base surface, the first angle is zero. Less than the rake face base surface, the rake angle is negative. The rake face than the base surface, the rake angle is positive.
(2) After the angle ao flank angle between the cutting plane.
(3) bo wedge angle between the rake face and the flank angle.
The size of the wedge angle of the cutting portion section will affect the size of the diamond cutting tool determines the intensity of the portion, which the front and rear corner angle ao go following relationship 3 in the cutting plane (S direction) angle measured
Ls main cutting edge blade angle and the angle between the base surface. The provisions of the positive and negative edge inclination as shown in Figure 7.3.8. Tip at the sds hammer drill bits  highest point, the blade angle is positive; tip at its lowest point, the blade angle is negative; cutting edge parallel to the bottom surface, the blade angle is zero. ls = 0 is called the cutting angle cutting, then the main cutting edge and cutting direction perpendicular to the chip along the cutting edge normal outflow. ls ≠ 0 is called oblique cutting of the cutting, then the direction of the main cutting edge and the cutting speed is not perpendicular to the flow of the chip and the cutting edge is inclined at an angle method 4 in the secondary cutting edge perpendicular to the plane of diamond tool (O'-O ') of the angle measurement
Secondary clearance ao 'flanks and the secondary cutting edge angle between the cutting plane.
The geometric angles, the fibre discs  most commonly used is the rake angle (go), posterior horn (ao), the main angle (kr), blade angle (ls), Vice-angle (kr ') and the Deputy posterior horn (ao') , commonly referred to common angle, parts of the diamond cutting tool geometry, the angle of the base out of the bus to complete expression geometry blade cutting portion, reflecting characteristics of the diamond cutting tool. er, bo is derived angle. 7.3.4 Diamond Tool working angle
Cutting process, due to the installation location of the diamond cutter, diamond cutting tool on the workpiece relative motion between the situation changes, the actual functioning of the angle and perspective of different dimension, we call these angles as the working angle.

cutter mold industry consumption characteristics

Diamond tool manufacturers say that in order to achieve mold lean manufacturing, mold enterprise scientific organization tool procurement and inventory management, need to study and  metal drill bits explore how to ensure that the production line functioning circumstances reduce tool inventory of funds used to optimize the tool's minimum inventory settings, the tool the starting point of purchase, purchase frequency and reasonable tool procurement quantities, to establish an effective early warning system tool, emergency response mechanisms and rapid response mechanism, there is a scientific and effective way tracking, status monitoring tool inventory and  carbide saw blades procurement status. It is understood that 68.5% of the total cost of the user enterprise cost of tools for less than 3%, and developed the tool manufacturing costs accounted for about 4% of the production costs, constitute a big gap, which is caused by the low level of China's manufacturing cutting a factor.
China mold industry is fragmented, low-scale, low-level phenomena, China mold manufacturer is only a handful of a few particularly large scale, and the remaining are mostly small and medium scale. These conditions determine the mold industry users of the tool features: procurement volume increased, and the number of frequent purchases, ie up to two months or so purchasing one, this reflects the consumer market is relatively mature, the mold industry in developing the budget tool users more inclined on flexibility, rather than retaining excess inventory. Meanwhile, the ring saw blades  user purchases the flexibility for those who have not yet entered the tool provider, the market provides ready access to opportunities. As demand procurement, have been replaced with another brand competition is also increasing.

Granite Building Materials may be carcinogenic

 carcinogenic killer careful radiationPeople benzene, formaldehyde and other indoor pollution has gradually attention, but also lack of knowledge building radiation contamination. She  drill bits pointed out that the mostMuch hidden from the stone. Due to the earth's crust contain radioactive substances, natural stone, too.
Radioactive stone on the human body, there are two, one is the stone decay of radionuclides emit X-rays of the human bodyCause external irradiation, but the probability is very low; Another is the release of radon exposure on the human body inside. Radon is toShell radioactive uranium, radium and thorium decay products of radon is listed as one of 19 kinds of carcinogenic substances, mainly the production of induced lung cancerAccording to testing, the radioactivity of different colors are different stone. Highest red and green, white, black is the mostLow. Therefore, consumers should choose carefully the red, green, or red blotches with granite varieties. He said that the wet granite pads  graniticExtensive use of stone should not be in the room, especially not in the bedroom, children's room to use.
Using more than 60% the proportion of Guangdong
"The use of granite is indeed very popular in Guangdong." Guangdong Provincial Bureau of Nonferrous Metal Geological Exploration team captain Zhang Xinxiong 931Said Granite is an important building material in Guangdong, and some of the more serious areas of granite radiation. Geological SurveyAlthough the department has long been investigated, but now this problem has not yet attracted people's attention.
It is understood that the  cutting blades level of radioactivity is divided into stone by A, B, C three categories, according to regulations, only the A class can be used in home roomInterior decoration. House renovated to do the best detection
Natural marble, they need to be taken to dilute the pollution ways to reduce pollution. Radon half-life of only 3.2 days at roomRadon concentration in the open doors and windows after 20 to 30 minutes afterthe outdoor levels can be reduced.
Therefore, the easiest way is to enhance ventilation. Just a furnished room is best to be detected. If the test resultsIf failed, you can use lower radiation shield paint or lead-free installation, to prevent the release of radon from building materials. If the radioactive targetToo high, the stone must be replaced immediately.

diamond cutter in the hole machining pay

 Diamond tool manufacturers say that the saying goes: "not good goods cheaper, better goods are not cheap", on the  diamond blade circular saw other commodities that may true, but I am afraid that the tool tool is not at all clear; key is to match. On the job site of many factors: cutting objects such as equipment, quality requirements, quality of personnel and so on. Comprehensive assessment, sensible manner, the best use, just right, in order to save money, reduce costs, participation in the competition in the industry. This depends on the mastery of professional knowledge and understanding of information of similar products.
 In machining, drilling about its processing total of 1/3. Holes are semi-enclosed cutting, therefore, chip, heat diffusing, cutting fluids are more difficult to cast, and processing difficult. With scientific and technological advances in machinery parts, precision of the hole and surface roughness increasing demand, while the precision bore machining production often become critical, must be resolved.
Hole machining techniques should be used when processing research equipment and machine tools (so-called hardware), but also to study how to effectively use the equipment better application technology (the so-called software).
Definition and classification of the hole
What is a hole? According to the national standard GB1800-1979 requirements: Hole mainly refers to the cylindrical inner surface. Seen, refers broadly inclusive face hole. Holes are usually classified according to the following method:
(1) according to the shape of points. There cylindrical bore, tapered bore, drum-shaped hole, polygonal hole, spline holes and other shaped holes and special-shaped hole (such as bending holes) and so on. Among them, the most widely used cylindrical hole.
(2) According to the shape of points. A through hole and the blind hole (blind hole); hole (refer to the hole depth L and the diameter D of the hole than 5, L / D short depth to diameter ratio or aspect ratio; L / D = 5 ~ 20 are generally Deep, L / D> 20 ~ 30 is a medium deep, L / D> 30 ~ 100 called special deep) and shallow hole.
(3) according to the size of the aperture. A large hole (D> 100mm), common holes (D = 10 ~ 100mm), holes (D = 1 ~ 10mm) and micropores (D <1mm hole).
(4) according to the processing mechanism to points. There are machining, special processing, mechanical and electrical composite processing. Despite the special processing method more, but 4 inch saw blades  because the equipment is more expensive and processing efficiency is not high reason, either now or in the foreseeable future, conventional machining process will continue to be the primary means of holes.
(5) Press the machining precision points. With coarse holes (such as drilling and boring after a rough hole), semi-fine holes (such as reaming, thick hinge, semi-fine boring holes) and precision holes (such as precision hinge, finely drawn, grinding, honing, grinding holes), etc. Precision holes usually refers to the IT7 ~ IT6 tolerance level or above, the surface roughness Ra <0.8 ~ 0.4m hole in its geometric shape accuracy (eg roundness, cylindricity, straightness axis, etc.) General provisions in its dimensional tolerances with 1/2 to 1/3 range.
As aerospace, automotive, high-speed trains, wind power, electronics, home appliances, energy, mold, hydraulic, machine tools and precision machinery equipment manufacturing industry rapid development and upgrading of products, precision hole applications is increasing. Such as a hydraulic system widely used in a variety valve hole, high-pressure cylinder tube are some typical precision holes. Hole machining due to its own characteristics, processing more difficult, but more difficult machining precision holes.
Hole machining characteristics
Hole machining is a more complex process, the processing chip must be properly resolved, cooling and lubrication and guidance and other issues. Holes main features are:
(1) Due to the workpiece aperture size, length and shape constraints, the cutting tool corresponding slender, rigidity, and most of the cantilever clamping manner, the processing likely to cause deflection and vibration of the tool.
(2) difficult to eliminate chips. To improve the conditions of the chip and chip, the chip is bound to increase the groove, but this will make the lower strength and stiffness of the tool.
(3) difficult to introduce cutting fluid to the cutting area, the chip, between the tool and the workpiece hole wall friction is large, the cutting temperature is high, particularly in deep holes. Therefore, the cutting fluid in the hole machining has a special role. Cutting fluid rational selection and proper use of hole machining quality, tool life and cutting efficiency have a great impact.
Holes commonly used methods of cutting liquid supply pressure casting method and cooled French. The former is the most simple, but poor results for the fluid and cutting fluid consumed in large quantities. Internal cooling method used for hole drilling, deep hole drilling, ejector drilling, nesting knife and single edge boring reamer hole cutting tools, the need to make the tool for the fluid pressure within the cooling (oil) passage hole, oil and gas mixture is passed through this channel is fed to the cutting area, this method with less consumption of the cutting fluid, the tool structure is more complicated. Now, with the tool manufacturing technology, domestic and foreign companies have introduced a variety of tools with internal coolant supply high pressure fluid (oil) passage hole new tool for internal cooling method used to create the conditions.
Now research suggests that colde saw blade  cutting fluid used almost dry cutting "Steam bundle" spray cooling method is most effective, and cutting fluid consumption, low processing costs. "Steam beam" spray cooling is a certain pressure (0.3 ~ 1MPa) the cutting fluid air atomized and sprayed at high speed cutting zone, so that temperatures were in the region of the cutting droplets quickly swirl vaporized. Vaporization of the liquid will absorb the heat, which can greatly cut down the temperature region, while also taking the cutting zone cutting fluid and space heat and powder, improve the working environment. Practice has proved that the same amount of cutting fluid in the case of "steam beam" spray cooling at the same time by the casting method of the heat is absorbed in 1000. Therefore, it is not only to improve tool life, but also enable the cutting fluid consumption is greatly reduced. "Steam bundle" spray cooling both for automatic production line, but also for the general metal cutting.
(4) processing the cutting tool can not be directly observed, particularly in the processing of the pores and deep. Therefore, automatic monitoring and control is more important than the other processing methods.
(5) accuracy of hole size, geometry, precision, accuracy and surface roughness mutual position often due to the special nature of hole machining is difficult to control, but once the trial is successful, rather than other processing methods can be more regularly maintained.

The basic use of superhard cutting tool items

Tool of different types of knives and cutters of different materials, superhard cutting tool diamond tool explain the basic use of items:
1, the tool cutting edge sds drill bits  products to be processed must be strictly adjusted to the center and the center height of the contour, is strictly prohibited below the center of the cutting.
2, PCD cutting tool main processing of copper, aluminum, zinc, alloys and other non-ferrous metals and rubber, plastics, bakelite, etc.
3, PCBN cutting tool main  wood drill bits processing hardened steel, cast iron, iron-based powder metallurgy and other ferrous metals.
4, PCBN tooling steel type workpiece, the workpiece should be greater than the hardness HRC40 or more. 5, PCBN cutting tool with a negative rake angle, for a positive rake angle and 0 ° rake angle of the tool, by increasing the inverted angularity compensation.
6, PCD cutting tool depth of no more than 3/4 tip is appropriate. PCBN no more than 2/5 of the dry polishing pads  tip is appropriate.
7, PCD milling available coolant. PCBN Milling can without coolant, suitable for dry cutting

The design of the hollow drill cutting

Hollow drill bit is a more appropriate tool to use portable hole machining tool. However, due to the manufacturing process of the hollow drill bit more complex, and the blind holes can not be processed, so in the metal cutting process is not widely used, usually only in the  diamond hole saw processing of a number of large-diameter through-hole of the workpiece or a noble metal or drilling equipment used only when the power is limited . Since there is no standard hollow drill styling products, so most of the processing for special materials developed hollow drill bit is required.
We worked to develop a user for processing difficult materials special hollow drill bit. Code of material to be processed U-Mn, the main chemical components include: carbon (0.56% to 0.68%), manganese (1.35% to 1.65%), silicon (0.2% to 0.35%), etc.; tensile strength ≥ 882N/mm2, hardness and wear resistance are high. The drill is used in a 17mm thick material processing? 30 +0.5 mm hole, portable drilling rig power <1000w, requires drill life> 30min, drill material W6Mo5Gr4V2. In the development process of the hollow drill bit, drill through repeated adjustment of the design parameters and drilling tests to finalize drill geometry parameters: rake angle g = 12 °, clearance angle a = 9 °, vice posterior horn a1 = 3 ° .
Here's the design of the cutting hollow drill bit to make a brief analysis of the impact.
1, drill cutting rake angle change on the impact of
Rake angle on the cutting force of the impact
The changes will affect the anterior horn of the chip material deformation, so that the cutting force change. Chip deformation greater cutting forces greater; chip deformation is smaller, the smaller the cutting force. This angle is 0 ° ~ 15 ° range of changes, the cutting force correction coefficient ranges from 1.18 to 1.
Rake angle drill durability against impact
Increasing the rake angle drill, makes the tip strength and thermal volume decreases, while the tip will affect the force. This angle is positive, the tip tensile stress; current angle is negative, the tip compressive stress. Such as the selection of the rake angle is too large, although the increased drill sharpness, reduced cutting forces, but the carbide tipped saw blade  tip tensile stress suffered greater tip strength decreased, easily broken. In many drill cutting tests are due to excessive damage to the anterior horn. However, since the material to be machined high hardness and strength, coupled with a portable drill spindle and machine rigidity is low, such as the selection of the rake angle is too small, the increase in drilling cutting force causes the spindle vibration, vibration apparent machined surface pattern, drill durability will be reduced.
2, the posterior horn of the impact of changes on the drill cutting
After increasing flank angle can reduce the friction between the cutting material, reducing the surface of the extrusion process. However, if after the angle is too large, it will reduce the edge strength and heat dissipation.
Directly affects the size of the posterior horn drill durability. In the drilling process, the drill main wear to mechanical abrasion and wear of the phase change. Consider mechanical abrasion wear when cutting life is constant, the posterior horn of the larger cutting longer available; consider phase transition wear, after the drill angle increases cooling capacity will decrease. Bit wear, with the flank wear with a gradual widening gradually increase cutting power, heat generated by friction will gradually increase, the bit temperature, when the temperature rises to the bit phase transition temperature, the bit will appear rapid wear.
3, drill sharpening process on the impact of design
Hollow drill bit less dosage, processing small quantities, so the design should consider the drill process issues, as far as common machining equipment and tools used to achieve processing and grinding.
The rake chip out, so a direct impact on the shape of the rake face and chip performance chip shape. Used chips in the process of being squeezed and friction of the rake face, and further deformation. The maximum degree of deformation of the base metal chips and to slip along the rake face, the chips bottom length is longer, thereby forming a variety of crimp shape. When using a hollow drill bit and hope the chips into crumbs or ribbon cuttings, in order to facilitate chip removal. For ease of machining and grinding, must be designed for flat rake face, without chip breaking groove. Rake in use does not require re-grinding.
Hollow drill flank is most likely to re-grinding of the face, but also the fastest surface wear, so hollow drill flank grinding sharpening is achieved.
Deputy Vice flank divided into inner and outer flank minor flank. Heavy grinding perspective, re-grinding inner and outer flanks not easy to achieve, so minor flank shall be designed for a throwaway form.
Based on the above analysis, the hollow drill blade is designed in the form shown in Figure 1. Processing Practice has proved that the design can meet the requirements and tool regrinding requirements.
4, the cutting fluid used and the impact on the drill cutting
The main characteristics of the hollow drill processing hole of the core is not to be cut, thus cutting the hollow drill twist ratio was significantly reduced, the power required for drilling and cutting the heat generated is small.
High-speed steel drill with a hollow drill, because of the hardness of the bit processing area a great influence on the temperature, thus the drilling process must be cooled using a cooling fluid (eg without coolant, the start bit will wear the phase change and rapid wear of the ring saw blades  main wear and tear). We started using an external spray cooling, but bit-position horizontal axis machining, the coolant is not easy to enter the drill blade portion, a large consumption of cooling fluid, the cooling effect is not ideal. The redesigned drill spindle structure change, the external spray cooling becomes an internal spray cooling, the cooling fluid from the hollow drill core join, the coolant can reach the cutting part of the drill, thereby significantly reducing coolant consumption, improved cooling effect.
5, the hollow drill bit to use effects
A well-designed hollow drill bit should also meet the requirements of the following aspects: ① easy to manufacture, to use common tools and common tooling; ② easy re-sharpening, grinding machine can be used for general sharpening; ③ high efficiency, long life; ④ low prices.
We have developed a hollow drill basically reached the above requirements. In actual use, drill durability is stable up to 50 minutes, the diameter tolerance, surface roughness, all reached the design requirements. Because only regrinding flank, posterior horn drill easier to control, in an ordinary grinder can be easily implemented on sharpening.