Some of the major role of Core Drill Bits

First, what is the drill
Is used to drill a workpiece to drilling tools.
Drill generally just (W18Cr4V or W9Cr4V2) made ​​of high-speed, divided twist , flat drill, center drill , countersink hole drilling, deep hole drilling , which is our twist fitter , machining the most  GUSHI metal grinding wheel common drill .
This is a paper I have to talk about is the main method of twist drill sharpening its restructuring . I began to talk about from the twist , first introduces the basic knowledge under twist .
Twist the type and structure:
Straight shank twist drill into , Morse taper shank . Generally straight shank twist drill diameter 13mm or less in diameter Morse taper shank twist drills are in 13mm or more. Typically the twist handle , neck , working part , wherein the working portion and the guide portion , the cutting part . Specifically as shown in Figure
( A ) the handle - is generally used to transfer the clamping force and a smaller diameter than Φ13 mm straight shank drill made ​​it , no clear straight shank drill neck , the diameter of the drill , trademark etc. engraved on the handle directly . Φ13 mm and a diameter greater than generally made taper shank drills , taper shank drills taper is produced according to national standards , according to the size of the drill diameter and made Mohs 1 #, 2 #, 3 #, 4 #, 5 #, etc. taper, the larger the size of the handle numeral greater . Flat tail taper the ends for easy removal and  GUSHI diamond bandsaw blades transfer torque from the drill bit role.
( 2 ) Neck - The neck is connected to the handle portion and a portion of the work , but also for the grinding wheel retraction drill is used , the diameter of the drill itself , materials and trademarks are engraved on the neck.
( 3 ) working part - it is divided into two parts ① cutting guide and the guide portion twist to the right direction to keep working , and when re- sharpening drill bits , cutting guide portion and gradually become part and to work. The guide portion has two parallel helical grooves , is to be formed to accommodate the cutting edge and the removal of the GUSHI turbo diamond blade  chips and facilitate the input of the cutting fluid . There are two edges with a guide portion , its diameter is slightly inverted cone , every 100mm length , shank diameter is reduced to 0.05-0.10mm, both to guide the direction of the drill bit cutting , but also can reduce the drill hole wall friction . ② a key part of the cutting portion of the drill bit , the flank twist of six , five blade consists of: a rake face comprising two , two rear flank , two sub behind the two main cutting edges , two auxiliary cutting edge , a horizontal edge , namely " a sharp three blade ." As shown in Figure
Through these two points , I believe we have fully understood the basics of the drill point , so I can deeper introduce myself sharpening methods and steps up .
Twist mainly by cutting part of the cutting , but we have to start from the drill bit is also part of the transformation . Start sharpening my own way to start talking .

Alloy Saw What Precautions

One must carefully read the items mentioned in the manual cutting machines and packaging shell on the front. 2, according to the material being cut blade varieties to select and check the blade for cracks, distortion, lost teeth, do not use if damaged blade. 3, be sure GUSHI turbo diamond blade  to install the cutter blade guard when using the shell, and wear masks or protective eye. 4, please check before installing blade cutter spindle is beating, when you install the blade with flange and nut set tight, people must be the center hole of the blade and is firmly fixed on the flange, according to Taiwan after installation, gasket sets must be purchased after a good hand gently push the blade when the washer confirm whether the eccentric rotation shaking. 5 job to be cut before use after installation Alloy saw pre-turn for a minute, until the machine into operation. 6, when the non-automatic cutting operation, you must gently cut into the normal operation of the blade material is prohibited Forced straining hard to push. And prohibit reverse ban suddenly stopped in the middle of the blade material is cut, otherwise lead to jagged off, saw  GUSHI concrete polishing pads body deformation, prone to danger. 7, using hear abnormal sounds, see abnormal shaking or section does not usually stop the job and find the cause of the exception, the timely replacement blade. 8, please wipe the rust after cutting oil, to prevent the blade is not used for a long time and rust. 9, insert the blade perpendicular to the tool holder to hang in a dry, avoid damp areas. Do not place the blade flat on the ground, otherwise easily lead to blade deformation. Do not directly stacked multi-chip saw blade should be spaced packaging to avoid jagged collision should gently. 10, again when the blade is not sharp serrated grinding, grinding is not easy to destroy serrated timely original angle, the impact of cutting accuracy and shorten blade life.
First, how to choose the right blade?
1, the basic data: ① machine spindle speed, ② workpiece thickness and material, ③ saw blade diameter size and pore size (shaft);
2, selected on the basis: the number of revolutions of the spindle and intends to match the outer diameter of the blade computing, cutting speed: V = π × outer diameter D × revolutions N/60 (m / s) is generally reasonable cutting speed 60-90 m / second,
Specific recommendations:
Material cutting
Softwood 60-90 (m / s)
Hardwood 50-70 (m / s)
Particleboard, plywood 60-80 (m / s)
Cutting speed is too large, machine vibration, voice large blade stability is reduced, degradation processing, cutting speed is too small, reducing production efficiency. The same feed rate per  tooth cutting increased, affecting the processing quality and life of the saw blade. Because the blade diameter D and spindle speed N is a power function, in practical applications, a reasonable increase speed and reduce the diameter GUSHI diamond polishing tools  of the blade is most economical.
3, quality bid:
As the saying goes: "not good goods cheaper, better goods are not cheap," probably true for other commodities, but it is probably not the right tool tools Sure; crucial match. Job site on many factors: such as sawing device object, quality requirements, quality of personnel. Comprehensive assessment, rationally choose the best use, just right in order to save money, reduce costs, participation in the competition. It depends on the expertise of similar products and understand the information.

Coring drill automation into future trends

The primary steel ball locking style locking retainer lock . It is fitted with an interference surface of the tooth does not charge big bang for the relative behavior of the cone from the slot Migration to dip . .
   But in some extraordinary formations , such as the water of the old dam water through the soil hardness between 3 to 5 , and the uneven distribution of hard and soft , to soil mixing pile ( spray or powder form ) over the soil solid , conical coring drill guide ( envelope ) Bored Pile havoc caused by extreme degree . Up to avoid damage , and then use tungsten carbide to the need to have wonderful mechanical wear resistant stone polishing pads  applications are being fully carried out the study of the matrix changes the matrix pill high energy blast renew . The relations between implied by the following formula . Figure unit volume crushing power and angle of incidence of the jet off hog ' disagreement on the radius of the affected tooth disseminated on the fate of the rock breaking discipline differences dip radius line speed differences drilling teeth to move the process does not differ from the angular velocity level differences and thus the formation of teeth drilled differences the crushing effect of differences occurred on rock stress field .
 Conical head under the horizon  diamond polishing tools drilling 6h, footage inadequate lm, for simplified core drill straight error can not be applied sparingly . Scale structure simply does not manufacture the low- locking retaining ring bosses care more convenient loading and unloading using commonly used in low- abrasive soft formations steel. Finite element simulation and analysis of the effectiveness of the angle of incidence of the jet rock breaking influence the fate of the angle of incidence is the angle between the disciplinary jet jet axis normal to the underlying purpose of the rock profile between . Test try  pdc teeth cutting load for six kinds of differences between the mechanical properties of rocks and sanding discs  49 kinds of specifications pdc teeth  divergence angle of the front , side angle , chamfer cutting teeth structure , diamond profile roughness , cutting depth , cutting speed , mechanical properties of rock seven aspects  cutting load tests carried out with the cutting load testing and analysis related to the other to try to get a large amount of valuable  attempt data . Tapered core drill holes through the trial into a temper , can not meet the requirements of footage . Shock loads that occur close drilling impact resistance era . The performance is poor, can not guarantee the verticality into the hole .

Resin grinding wheel can not be stored in damp places

Insist on using the FIFO principle , be used during the best use to ensure wheel, resin grinding wheel use during the warranty period , if more than one year will need re-testing its strength and appearance , may continue to use the check. Wheel, resin grinding wheel requires a full , tight packaging , so as to ensure that transportation to and from the course without collisions. During transport needs careful not to get wet , away from alkalis items. Resin wheel to wheel and usually square and placed neatly , try  concrete ring saw not to tilt, do not let their pressure and prevent deformation. Wheel in the store when the use of wooden pallets Gechao mopping -out , avoid direct contact with the ground , from the ground requires 10cm to 15cm, the maximum height does not exceed 1m. The company has advanced production equipment and first-class technology . Product quality and perfect after-sales service , the main production and operation : ceramic grinding wheel, resin grinding wheel , abrasive series and other electrical products.
The wheel up from the melt rotation , relying on rotating grinding wheel blows excess impregnant . Whetstone holding abrasive grinding wheels  time in the air for 1-1.5 hours . Wheel according to this specification discard excess impregnant not formed on the diamond trimming the tumor , while the grinding surface of the plug is not greasy , and will not produce burns on the surface to be ground . Vintage stearyl wheel and immersion treatment is sulfur impregnation of the substrate to process a variety of wheel technology, can improve grinding performance, but there are some defects in the process of handling the final result is often used to reduce the effect of wheel . Our analysis of the reasons that these components can form a homogeneous melt , stearyl distributed above and below the sulfur distribution in  tile cutting blades contrast , modern technology is dipping treatment on the development of conventional treatment , were then placed in was heated to 130-135 ℃ impregnant composition in the melt , from 2.8 rpm / sec to stop the fall of the pulse with the rotation speed of four minutes . This will ensure that all components of impregnation evenly soaked in the wheel .

How to avoid the cutting process burns

The question now is how to avoid burns during cutting , the low cutting efficiency.
The first is whether the choice of wheel hardness is too high or too bottom , should burn microstructure appears too high , can not accurately test the organizational structure of material errors. Should the hardness appears over the bottom end of the cutting efficiency , waste cutting disc . How can the cutting process does not burn and sharp, the diamond blades  hardness of the material needs to be used correctly detected , and the cooling fluid.
 Followed by the selection of cutting slices of raw materials , alumina material of choice for cutting metal materials , cutting non-ferrous metals and non-metallic materials of choice for silicon carbide material. Because the cutting metal material with no chemical reaction with the metal alumina material chemical composition, facilitates the cut . Non-metallic and non-ferrous metal chemical activity of small, silicon carbide material itself chemically active than the alumina , better cutting performance , small burns , wear and small .
 Once again, the particle size , particle size selection in favor of a moderate cut . If the request should use dry cut blades  sharp coarse granularity. If you require high precision cutting , partial fine granularity should be used abrasive .
 In short , the problem of the cutting process in metallurgical samples to the hardness of the material before and determined in the selection of cut pieces . In the selection of the targeted cut sheet material. Unlike ordinary metallurgical cutting metal cutting , common metal not require more than you can burn off just durable resin grinding wheel cutting disc quality analysis resin grinding wheel cutting disc with ceramic small wheel , super oil stone , plated grinding wheels, abrasive resin ( superhard and Cape mill ) products, suitable for business investment , marketing is not difficult , most can be said cottage , less investment , less employment , small footprint, simple process , which produces high- quality products with stable quality there are some difficulties, only regular visits to customers , invested research and development of new products , a lot to learn advanced technology to the workshop to develop into a real business.
    ( 1 ) Abrasive material: Common abrasive cutting wheels have cut brown jade (A), white fused alumina (wA), black corundum (BA), silicon carbide (c) , the most commonly used is corundum, corundum hardness because high , high toughness and shape , applicability and low price compared to other abrasive characteristics . Corundum their reduction in the adequacy of primary smelting and secondary sand sand , mainly in the chemical composition : Al2O3 content level sands ≥ 94.5; Al2O3 content of 94.5% of secondary sand ; generally around 85% and Fe2O3 content of 4-5% ; therefore stone polishing pads  lower than the hardness of the secondary level sand sand , but the price is also low ; corundum for a variety of carbon and alloy steel processing in general ; higher than white fused corundum hardness, brittleness large , grinding heat is small, because the price is high , the thermal deformation of the workpiece requires hours , and it also has a special material is used as an abrasive mix processing ; Al2O3 corundum content in the 70 ~ 85%, Fe203 content of 7-9 %. low hardness , cutting forces poor, but the price is cheap ; tall black silicon carbide hardness and brittleness good , sharp cutting edge , good self-sharpening properties, good thermal conductivity, have an advantage in terms of processing non-ferrous metals , plastics , rubber and cast iron .
 2 ) Abrasive Grit: Common particle size : 22 # -80 # , fine granularity low cutting efficiency.
 3 ) Wheel hardness: Hardness used : P, Q, R; N, S; hard wheel generally used to reduce grinding wheel wear. The hardness number of the binding agent , the density of the molding , sintering temperature and sintering time were controlled .
 ( 4 ) binders:
 ( 5 ) Organizations: cutting wheels should be slightly larger number of organizations to improve cutting efficiency : too much strength and influence , often organized No. 3 to 7 . Forming firing ( also called hardening ) the impact of technology on the cutting performance :
 ( 1 ) Molding are: hot , cold, rolled three methods. Thermoforming method required little pressure. Cutting sheet molding density, high hardness , strength ; multi-purpose hot pressing in northern China ; advantage of cold pressing method is that when the heat source is not required for grinding various binding agents ; multi-purpose cold southern China Law ; rolling law required energy is small, small molding density, low efficiency , are less common . Generally without enhanced network has thin wheel and export resin piece wheel with Bo .

vitrified diamond and CBN grinding wheel slotting process

1 Overview
  Evolving cutting tool materials, from high-speed steel, tungsten, ceramic metal oxide ceramic micro-particles until tungsten. At the same time, the geometry of the tools of new materials, structures, and even change the shape aspect is also changing, led the development of grinding technology, the ceramic tile saw  emergence of new tools for grinding and finishing techniques, as well as a new way of binding agents. This grinding equipment accordingly requests, high power, high material removal rate become a trend, and on this basis is in the processing of higher requirements can also achieve the same machine trimmed.
 On the economic assessment of the grinding process will involve the machine costs, labor costs, management fees and tool costs. Among them, labor hours and machine costs account for as much as 80 percent, which determines the need to improve the economy, the need from the  diamond hole saw following two aspects: 1) high material removal rate, that improve grinding efficiency; 2) to reduce non-grinding time . Enhance the material removal rate by increasing the feed rate and feed rate to achieve every time, and in order to reduce the non-grinding time, consider reducing the frequency of wheel replacement time, as well as aid in the machine grinder trimmed to achieve their goals.
  Recently, has emerged to replace the usual use of resin bond diamond and CBN grinding wheels ideal alternative - vitrified diamond and CBN grinding wheels, grinding its superiority in terms of these two aspects is built in to improve the economy of the above, especially in terms of processing slotted, more fully reflects its advantages.
2 Vitrified diamond or CBN grinding wheel grooving state
  It is undeniable that, because of its strong grinding force and high material removal rate, softer resin bond diamond or CBN grinding wheel in the current machining carbide or high speed steel cutting tools are still to be widely used. However, an increasing awareness of the tool manufacturer, resin bonded grinding wheel there is a lower than poor shape retention and drawbacks, which makes the high cost of machining groove, especially the use of shape processing 14F1 When circular groove, this phenomenon is more serious.
 The vitrified diamond or CBN grinding wheel is able to overcome this shortcoming, it is not only easy to repair, maintain good, but also help to control the chip and the heat of formation of pores, with a strong grinding force.
Usually installed in each wheel, radial and  General purpose blade axial runout will appear, as well as dynamic imbalance and other issues in the use of ceramic binder will encounter, so do not be handling and interior trim will contribute directly to the machine significantly Improved accuracy of the wheel.
3 Vitrified diamond or CBN grinding wheel grooving to use examples
 Grinding parameters:
 Margin ae = 3,5 mm; feed speed vf highest 150mm/min; cutting speed vc = 12-44m / s.
 Trimming parameters:
Wheel feed rate vcd = 18m / s; wheel and wheel speed ratio when dressing qd = 0.7; Feed aed = 3μm.
4 trim system
 Single piece of diamond or CBN grinding wheel vitrified high cost, which is only valid ground floor just a few millimeters, is calculated to be trimmed if added, soon ran out, the amount actually used in the grinding of a workpiece Only 5-10% of the grinding wheel layer, the rest is actually out of the repair. Therefore, the correct way of dressing is very important.

The introduction of the surface roughness of diamond grinding wheel

The machined parts diamond grinding wheel surface , there will always be some macro and micro geometry errors , part on the surface of microscopic diamond wheel geometry error is determined by the parts on the surface of a series of tiny diamond wheel spacing valley wood band saw blades  formed , these tiny undulating valley called the degree of surface roughness of diamond wheel parts .
Surface roughness is a measure of diamond wheel diamond grinding wheel surface machining precision parts is an important indicator of the surface roughness of diamond wheel parts will affect the level of two parts in contact with the surface of the diamond wheel friction , motion surface wear , the bonding surface sealing , with a surface of the working precision , the fatigue strength of the rotary member , the appearance of  diamond blade circular saw parts , etc., even on the part of diamond grinding wheel has an impact on the corrosion resistance of the surface . 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 metal drill bits  currently used in the resin grinding wheel cutting disc, double-end , heavy duty wheels, polishing wheels and so on.
There are many special resin binding cutting diamond wheel for rapid cooling . These wheels especially suitable for carbide tools ( such as saws, cutting machines , drilling tools, end mills , etc. ) grinding . In addition, these tools can also be used carbide dies , rollers and carbide wear parts , precision grinding operations. Resin binding wheel and precision machining of ceramic products, ceramic grinding tungsten carbide and the preferred thermal sprayed layer . CBN grinding wheel can be used with resin glue used in combination for grinding high-speed steel , tool and die steels and superalloys FtRC50 above .

Use some method of diamond tools

Diamond cutting tool is mainly processing of non-metallic materials of high hardness , scope more widely, then we use diamond tool tips when you do what ? 1 , different specifications and uses of the blade , the blade angle and the design matrix forms are different, as far as possible according to their corresponding occasions ; 2, the device spindle and plywood size and shape and position accuracy with the results there are influence , installation and adjustment to be checked before the blade . Especially iamond tools manufacturer  for plywood blade contact surface with the impact caused by the clamping force to slip displacement factors must be excluded ;
3 , pay attention to the work of the blade , an exception occurs, such as vibration, my voice , machined surface material moving situation, you must promptly stop adjustment , and timely grinding, maintaining peak interest ;
4 , grinding blade must not change its original angle , to avoid sudden thermal quench local head , the best professional grinding
  Diamond tools with high hardness and wear resistance , low friction coefficient, high elastic metal drill bits  modulus , high thermal conductivity , low thermal expansion coefficient, and low affinity and non-ferrous metals and so on. Can be used for non-metal brittle materials such as graphite , high wear-resistant materials , composite materials, high toughness silicon aluminum alloy and other non-ferrous materials, precision machining . Many types of diamond tools , the performance difference was significant , the structure of different types of diamond tools , method of preparation and application areas is quite different .
Within a certain range , when the diamond concentration changes from low to high , the blade sharpness and cutting efficiency carbide tipped saw blade  decreased, while life is gradually extended ; but the concentration is too high , the blade becomes blunt . The use of low concentration , coarse , efficiency will be increased . The use of various parts of the cutting head when the different roles of different concentrations ( i.e. three or more layer structure in the intermediate layer can be used in low concentrations ) , the saw blade during the work head to form an intermediate groove , with helps prevent blade deflection , thereby improving the quality of stone processing .

Diamond high hardness and excellent mechanical properties make diamond tools

 Diamond high hardness and excellent mechanical properties make diamond tools for processing a variety of hard materials become indispensable effective tool. Metal base of the diamond matrix adhesion (matrix package Xiang ability) that affect the life and performance of diamond tools is one of the main factors.
The diamond and general metals and  alloys having a high interfacial energy between, resulting in the diamond particles can not be generally low-melting alloy infiltration, poor adhesion, in the conventional manufacturing techniques, the diamond particles alone after the carcass shrink the mechanical gripping force embedded in the metal matrix of the  12 inch saw blade carcass, but not form a strong chemical bonding or metallurgical combine, resulting diamond particles in the work easily with metal base carcass separation, greatly reducing the diamond tool life and performance levels. Most of the diamond impregnated type tool utilization is low, a lot of expensive diamond in the work lost in the litter fall into. Lin Zengdong other first surface metallization using diamond diamond surface to impart a number  drill bits of new features, such as excellent thermal conductivity, good thermal stability, improving its original physical and chemical properties of the metal or alloy to improve its wettability of the solution, etc.
Diamond surface metallization problem , it caused a domestic diamond tool manufacturing industry's attention. Many people committed during the sintering process to achieve the diamond surface of metal in the matrix material or on the diamond surface to add the pre-glue strong carbide metal powder (which is not heated before the diamond, not associated with a chemical coating reaction only belong diamond coating) to expect them hole saw blades  to realize the sintering process chemical bonding of the diamond. Although the literature has demonstrated some metal such as tungsten (not oxidized) at a lower temperature (800 ℃ or so) WC can be formed on the surface layer of the diamond, but the diamond surface to achieve the pre-metallization process used to view, to be in a vacuum conditions, 600 ℃ heating above one hour to get the desired adhesion. Impregnated with the most commonly used cutting tool diamond sintering conditions of view, non-vacuum or low vacuum of not more than 900 ℃ heated for 5 minutes or so

the main material grinding wheel

Grinding wheel is used for grinding abrasive, thin wheel dry pads  a call. Grinding wheel as the dental industry, many industrial enterprises were adopted, then the grinding wheel which specific material it?
The so-called material is produced using abrasive grinding wheel. The most commonly used abrasive grinding wheel is corundum (A) and corundum (WA), followed by black silicon carbide (C) and green silicon carbide (GC), the remaining common and chrome corundum (PA), monocrystalline corundum ( SA), microcrystalline corundum (MA), zirconium corundum (ZA). Produced using different abrasive grinding wheel, there are different characteristics.
Corundum grinding wheel: slightly higher than the diamond cup wheels  hardness of corundum corundum, corundum toughness lower than in grinding, abrasive shatter easily, so grinding heat a small, suitable for manufacturing grinding hardened steel, high carbon steel , high-speed steel and thin-walled parts with grinding wheel, high cost than corundum.
Corundum grinding wheel: corundum hardness, toughness, suitable for grinding high tensile strength metals such as carbon steel, alloy steel, malleable iron and hard bronze, etc. The  industrial saw blades abrasive grinding performance, adaptability , commonly used in the removal of coarse large margin, cheap, can be widely used.
Green silicon carbide grinding wheel: Green silicon carbide high hardness brittle than black, abrasive sharp, good thermal conductivity, suitable for grinding carbide, optical glass, ceramics and other brittle materials.