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

Grinding wheel used to improve the performance of the basic parameters can not be discounted

Carry on the work of the grinding process , to choose the right material , depending on the hardness of the grinding wheel grain size of the workpiece, in addition to these commonly used during the grinding wheel a few basic parameters , but also pay attention to , so masonry saw blades   as to maximize the improvement of grinding efficiency.
Arc a diamond wheel in contact with the workpiece ( unit : mm).
2 . Wear ratio .
3 grinding energy . Is the energy per unit volume ( or weight ) of the metal consumed removed. Its value is smaller, the better the material can be grinding , metal removal rate is relatively higher .
4 diamond wheel line speed . ( Unit : M / S)
According to grinding machine spindle speed diamond wheel speed can be drawn , then the basis of its diameter , it can draw its line speed. Wheel manufacturers are generally of a standard line  granite core bits speed , i.e. the linear velocity , diameter, rotational speed are related.
5 in the axial cylindrical grinding feed rate ( Unit : mm / r)
According to the width of the wheel , using the appropriate amount of axial feed , in the process , you can ensure efficient grinding efficiency at the same time , to get better results. If coarse steel , feed rate of 30% to 70% of the width of the coarse castings , feed rate of 70 % to 80 % of the width , while grinding , feed rate , compared with 10% of the width to 30 %.
6 inner axial cylindrical grinding feed diamond grinding wheel  rate (unit : m / min). Axial and axial feed rate is the feed rate and workpiece speed related .
7 workpiece speed ( unit : m / min). This is the diameter of the rotational speed of the workpiece and the workpiece related .
Only in a variety of relevant factors are considered comprehensive , and will make the grinding wheel to achieve the best results....

The chemical composition of the diamond and the causes

Diamond is one of many married women must have a baby in mind, this is actually a diamond diamond. This diamond and diamond saw we say what does it matter? A senior quality natural diamond, a diamond for industrial use, poor quality, it may be artificial, but one thing wood band saw blades  is the same: their hardness. Diamond is one of the hardest metals, natural form so hard, but why such a beautiful stone?
First, the chemical composition of the diamond
To understand the formation of the first to know his diamond chemical composition. The chemical composition of the diamond is carbon, which is the only single-element in the gem. Is isometric crystal system. Crystal form mostly octahedron, rhombic dodecahedron, tetrahedron, and their poly shape. Pure colorless diamonds, the mixing of trace elements present different colors. Strong adamantine luster. 2.417 refractive index, dispersion medium, 0.044. Homogeneous body. Thermal conductivity of 0.35 cal / cm? Sec? Degrees. Thermal conductivity meter test, the reaction is most sensitive. Hardness of 10, is the hardest known mineral, quartz absolute hardness is 1000 times, 150 times corundum, fear, hit after hit will be broken along its cleavage. A cleavage completely. Density 3.52 g / cc. Diamond has a luminous, the  Plate Compactor sunlight, the night can emit phosphorescent light cyan. X-ray irradiation, emit blue fluorescence. Diamond is chemically stable at room temperature is not easy to dissolve in acid and alkaline, acid does not produce its effect.
Diamonds and similar gems, synthetic diamond distinction. The gemstone market common substitutes or fake colorless stones, colorless spinel, cubic zirconia, strontium titanate, yttrium aluminum garnet, yttrium gallium garnet, synthetic rutile. Synthetic diamond was first developed in 1955 by the Japanese success, but mass production. Because synthetic diamonds than the high cost of natural diamonds, synthetic diamonds on the market so rare. Diamond its unique hardness, density, and dispersion, the refractive index difference may be similar thereto gems. Such as: Fangzuan cubic zirconia and more colorless, strong dispersion (0.060), strong luster, density, 5.8 g / cc, weigh heavy hand feel obvious. Yttrium aluminum garnet dispersion soft, it is difficult to visually distinguish the diamond.
It has become the people who can stone polishing pads  own, wear mass gems. Diamond's culture and long history, more people today see it as a symbol of love and loyalty.
Second, the causes
These components together is how to become a diamond it? Modern science and technology, the means to explore the formation of diamond provides new ideas and methods. Diamonds are the hardest in the world, the most simple ingredients gem, which is composed of carbon, and a natural cubic crystal structure.

As abrasive wheel itself has high hardness and heat resistance

 As intense friction, leaving the grinding zone temperature is high. This will cause the workpiece to produce stress and deformation of the workpiece surface and even cause burns. Therefore, a  dry polishing pads lot of grinding coolant must be injected to reduce the grinding temperature. Also from the coolant and lubrication chip.
Grinding large radial forces. This will cause the machine - grinding wheel - workpiece system flexibility retreat, the actual depth of cut less than the nominal depth of cut. Therefore, the grinding will be completed when the light is not to be infeed grinding to remove the error.
After blunt abrasive, grinding force also increased, resulting in grain crushing or off, re-exposing the sharp abrasive grinding wheels  edge, this feature is called "self-sharpening." Self-sharpening of the grinding head in a certain period of time to normal, but over a certain working time should be performed after manual trimming, grinding force increases so as to cause vibration, noise, and damage the workpiece surface quality.
As abrasive wheel itself has high hardness and heat resistance, high hardness can be processed so grinding materials such as hardened steel, carbide, etc..
Determine the characteristics of  abrasive grinding wheels the grinding wheel and grinding grinding system can make even a trace cutting, general ap = 0.001 ~ 0.005mm; grinding speed is high, generally up to v = 30 ~ 50m / s; grinder stiffness; adopts hydraulic transmission, Therefore, grinding can be obtained economically with high precision (IT6 ~ IT5) and a small surface roughness (Ra = 0.8 ~ 0.2μm). Grinding is one of the main methods parts finishing.

Ultra-thin diamond grinding wheel series use

Thin diamond grinding wheel diamond grinding wheel is used on the basis of common technology, then after selection through the use of diamond powder metal contact made ​​of ways . A variety of hard concrete core bits  and brittle so it can cut grooving data , such as : a variety of silicon , germanium , ferrite, glass , lithium niobate , gallium phosphide ( diamond wheel ) , lithium tantalate , phosphorus arsenic gallium , gallium arsenide , all kinds of ceramics. Which has high strength and ultra-thin diamond grinding wheel tolerance , high precision, ultra-thin and other features .
 Ultra-thin diamond grinding wheel series is a fact that thin ring. Which will demand pick appropriate scale flange can use , through the use of edge wear after assuming full circle may have been destroyed after the blade , then it can be swapped into a smaller flange can be sustained by trimming after use can be described as very economical. Just simply use another fine grinding wheel flange, then we can get the best cut effect. So  diamond blade saws the use of diamond grinding wheel conditions are what it ?
1 cut diamond grinding wheel speed is necessary more than 80 m / s ;
2 cut diamond grinding wheel normal speed ( to be cut speed ) based on the information and cut precision cut demand conclude , usually 0.5 to 200 mm / seconds ;
 3 cut diamond grinding wheel when it is necessary to water cooling, cooling water flow rate is not less than 2.4 l / min ;
 4 cut diamond grinding wheel grinding wheel thickness and depth of cut based on information determined . Maximum depth cbn wheels  of 3 mm incision is usually within ;
 5 new sand grinding wheel before use is necessary to open with a special marking plate edge marking .
 6 films selected diamond grinding wheel , in order to ensure the best cut effect ( glass grinding wheel ) cut data based on different needs to select the appropriate grit size grinding wheel .

CBN grinding wheel dressing cycle is long

  CBN abrasive hardness higher than normal , high hardness means more sharp

and cutting stronger ; CBN has a higher wear resistance, means that it is

harder than ordinary abrasive wear ; ability  sds drill bit  to maintain the shape of CBN

abrasive high-performance one of the main characteristics of the abrasive ;

CBN high compressive strength , which means that in the harsh conditions of

use it can remain intact and not broken particles ; CBN has good thermal

conductivity , the grinding can be achieved when cold cutting .
1, high hardness, high toughness CBN human hardness only to diamond synthesis

of superhard material is much higher than the normal corundum and silicon

carbide abrasive , and thus has a flap wheels  better cutting ability , more sharp.
2 , high temperature resistance , good thermal stability .
3 , chemical inertness . 4 , good thermal conductivity . 5, the grinding

performance, good surface quality 6 , abrasion resistance and longer life.

CBN grinding wheel ratio up to 3500-5500 , a hundred times more than ordinary

high corundum grinding wheel , diamond grinding wheel 3-5 times higher than

that . 7 , environmental pollution, energy saving. Without too much powder

dust. 8 , high efficiency, good overall economic efficiency . Sharp grinding

, grinding force is small , CBN grinding wheel dressing cycle is long ,

finishing less the amount , the replacement for a long time ; long life

cycle, grinding ratio , getting a better economy, in use to maintain good

shape , without regular replacement wheel and wheel dressing , saving time ,

improving working conditions , is  stone drill bits conducive to the machining operation .
   Cubic boron nitride (CBN) is not suitable for grinding carbide and non-

metallic hard materials . In the grinding temperatures , CBN case of alkaline

aqueous chemical reaction occurs , CBN wheel at 300 ℃ alkaline solution will

be decomposed in boiling water to trace decomposition destroyed crystal

grains will result , so that when grinding only use oil-based coolant , not

water-based coolant.

The main mechanism of grinding wheel burns introduction

When the grinding wheel surface temperature , if the cooling measures is not good , it's easy on the workpiece surface ( from tens to hundreds of um um) occur secondary quenching and tempering . If the grinding wheel surface layer of the instant temperature exceeds steels AC1 point, the role of the secondary coolant quenched martensite , while  concrete saw blades in the subsurface due to temperature gradients , short time , only the formation of high-temperature tempering organization This makes the surface and subsurface between the tensile stress and the surface of a thin brittle secondary hardening martensitic , when can not afford , it will crack.
Heat treatment of
A ) residual austenite retained austenite grinding wheel grinding wheel grinding wheel because heat and pressure generated changes occur at the same time may be accompanied by tempering and grinding wheel surface cracks. Amount of residual austenite should be controlled within 30% .
2 ) carbon concentration diffusion layer nitrided layer carbon concentration is too high, easy to form a nitrided layer tissue or excessive free mesh carbide carbide . Because this substance extremely hard , the wheel grinding process may lead to local overheating tendencies and incidence surface tempering . Nitrided layer carbon concentration is too high, the surface will produce excessive residual austenite. Resulting in burns and cracks. Therefore, the surface carbon concentration increases, reducing the performance of the grinding wheel , the general surface carbon concentration should be controlled within the range of 0.75% -0.95 % .
3 ) carbide distribution should be diamond core drills  uniform carbide distribution and morphology , particle size not greater than the average diameter lμm; carbide morphology should be spherical , powdered or finely punctate distribution along the net , mesh or angular carbides are not allowed .
4 ) decarburization heat treatment . Surface or environmental cause improper surface oxidation , so that the workpiece will produce a thin carbon layer , this layer will cause decarburization soft wheel overload or overheating , resulting in surface tempering .
5 ) tempering the premise of ensuring the hardness , the tempering temperature is as high as possible a number , as long as some of the annealing time . This can improve the surface carburized hardened plastic , and the residual stresses are balanced or lower . Improving the abrasive tools  distribution of surface stress . This can reduce the probability of cracks occur workpiece , thereby improving the efficiency of the grinding wheel grinds the workpiece .
6 ) deformation should minimize heat deformation . This reduces the grinding wheel margin. If the heat deformation is too large, if the operation is not in the workpiece grinding wheel radial runout maximum at the beginning of the grinding wheel , grinding wheel each time point at which the grinding wheel is removed margin would not be normal, resulting in burns and cracks.

CVD diamond coating and the difference between the amorphous diamond coating

(1) CVD diamond coated with amorphous diamond coating difference
Amorphous diamond ( also called diamond-like carbon - Annotation ) coatings are deposited using a PVD process carbon . It has a key part of the diamond SP3 , SP2 also has some carbon bond ; their sds hammer drill bits  film hardness is high, but lower than the hardness of diamond film ; thickness than we usually deposited diamond film to be thinner . Machining graphite , amorphous diamond coated tool life is uncoated carbide tools 2-3 times. In contrast , CVD diamond is deposited using CVD process pure diamond coating , machining graphite carbide cutting tool life is 12-20 times , thereby reducing the number of tool changes to improve the reliability and accuracy of processing consistency.
( 2 ) can not be hardened steel with diamond tooling
Diamond from carbon atoms. Certain materials when heated , sucked from the carbon atoms in diamond and carbide is formed in the workpiece . Iron is one such material . Cutting tools with diamond iron group material , the friction generated heat causes diffusion of carbon atoms in the diamond into the iron , the resulting diamond coating due  diamond blade circular saw to chemical wear and premature failure . 
( 3 ) re-grinding and ( or ) heavy coating of diamond coated tools is difficult to guarantee the quality of the coating formed on the surface as the tool for the pure diamond , so the tool with a diamond wheel for re-grinding takes a very long time. In addition , the growth of the diamond tool used . Preparation of the tool will change the chemical properties of the surface , since the coating of this chemical properties requires very precise control, so the effect of the tool recoating difficult to be guaranteed .
( 4 ) diamond coated tool life varies
Like any other tool , diamond coated tool life varies , depending on the material to be cut , the choice of feed rate and cutting speed , and the geometry of the workpiece and so on. Generally, diamond-coated graphite machining tool life is uncoated carbide tools 10-20 times , in some cases, may even be longer. This way , you can use a tool to complete almost any processing tasks without tool change due to tool wear and to avoid disruption and recalibration process , making it possible to achieve unattended machining . The processing of the composite material , is entirely possible to obtain a longer tool life.
According to reports, in the processing of high-density glass fiber , carbon fiber and Gl0-FR4 other difficult cutting blades  machining composite materials , diamond-coated tool life up to uncoated carbide tool 70 times .
( 5 ) diamond coating spalling can prevent flaking coating of diamond -coated tools are a serious problem , but also a common problem ( especially in the processing of materials like carbon fiber ) , will lead to unpredictable tool life . The late 1990s , interfacial chemical properties were identified as affecting the diamond coating adhesion properties of important factors. By selecting good compatibility Carbide chemical characteristics, the use of appropriate technology and reasonable pre- deposition reaction conditions , it is possible to reduce or eliminate the diamond coating spalling , stably smooth wear patterns . Observed under the microscope normal wear diamond coated tool , you can find the diamond was worn until stable carbide substrate , without chipping or peeling .

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 .

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.

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 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

How to replace the worn drill

Bits in underground work after a certain time, scraper blade drill a smaller diameter, shorter, blunt, rock crushing capacity will become weak, progress slowed down. Tags: Geological coring drill bit concave three wings
Bits in underground work after a certain time, scraper blade drill a smaller diameter, shorter, blunt, rock diamond bandsaw blades  crushing capacity will become weak, slowed down progress; cone drill because tooth wear erosion, 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 the heterogeneity caused by the formation of the PDC drill occurred crack, break, out , also makes drilling footage slower. To speed up the whole well drilling speed, must be replaced with the old drill and drill bit is a few hundred meters to several kilometers underground, how to replace the drill rig workers do?
Drilling rig power driven turntable, kelly, drill and drill bit rotates through observation instrument ground rig drill underground work, as consolidated judgment, if that bit has been worn, replace the drill bit should immediately stop drilling . After stopping drilling to  tile cutting blades continue to maintain the drilling fluid circulation for some time, the purpose is to adjust the performance of the drilling fluid and the cuttings suspended in the fluid out of the ground, the loop so that the new wellbore wall remained stable, while also To carry out routine inspections of drilling equipment. Workers use derrick drilling crown block, traveling block and hook, according to the height of the derrick by column (generally composed of two or three drill) from drilling wells up out of all. After the drill column from the discharge order in the derrick, the proposed downhole drill string while continuing to use the drilling pump perfusion fluid annular space, the  concrete cutting blade purpose is to keep the wellbore fluid level does not drop, the wellbore pressure to balance the formation pressure to prevent borehole collapse or underground formation fluid into the wellbore. Meanwhile, we should pay particular attention to the reduced diameter borehole sticking may occur, the operator must be strictly controlled to enhance speed. All within the wellbore drill pipe, drill collars, after starting out, the need to replace the drill will also act out the workers after removing the old drill press fitted with the new drill down to the original column order can be restored after drilling wells .

Drill a brief description of the use of technology

Different well structure, the size of rock bit, type and use are special requirements. As general requirements whipstock cone drill teeth or warranty with trimming path structure, the use requiring high speed, low WOB and so on. Tags: three-wing concave concave geological core drill bit
Different well structure, the PCD grinding wheel  size of rock bit, type and use are special requirements. As general requirements whipstock cone drill teeth or warranty with trimming path structure, the use requiring high speed, low WOB and so on.
WOB and RPM to determine, not only determines the efficiency of the rock crusher cone bits, but also affect the cone drill teeth, bearing wear. Asai, soft formations, rock bit to shearing based, generally using high speed, low WOB. Medium hard formations, rock bit shearing, impact, crush comprehensive role, generally use medium speed and concrete drill bits  medium and high WOB.
Crustal rocks in different positions, which greatly changes the mechanical properties of the rock. Deeply buried rocks, in the multi-directional compression stress state, the rock porosity decreases, the intensity increases. Cementation upper hole section generally loose, soft, high speed roller bits, drill down. Lower section generally rock hard, abrasive large, low speed cone drill, drill pressure is high, use a long time. Lithology and different soft and hard rock crushing mechanism is different, resulting cone bit different forms of failure. Our various oil drilling in  masonry drill bits the common lithology, its mechanical properties are measured petrophysical.
Controlled drilling drill Type: PCB drilling with a drill with straight shank twist drill, twist drill set and fixed shank shank Spade (undercut) drill bit. Straight shank twist drill mostly for single head machines, PCB drilling relatively simple or single panels.