MRF polishing technology is the use of a magnetorheological fluid rheology

Abrasive magnetic fluid in the case of an external magnetic field without the performance of a general fluid state, has a good fluidity, and once it is applied to the external magnetic field will rapidly increase the viscosity, exhibit solid-like properties, which is a liquid abrasive magnetic rheology. Currently MRF polishing  synthetic diamond powder  the use of a magneto-rheological fluid rheology, but the technology is also limited to optical lenses, ceramics, glass and some other non-metallic materials, parts of the surface grinding. This thesis is in the full use of  Abrasive grinding  abrasive fluid rheology basis, in order to achieve the metallic materials, especially  Diamond blade  parts of the surface finishing, while presenting a liquid magnetic abrasive finishing technologies. By analyzing the composition of liquid and characteristics of magnetic abrasive, abrasive magnetic fluid obtained finishing machining technique works.

Abrasive is to combine a boehmite, aluminum hydroxide and magnesium nitrate combined with the product

Abrasives grown in an aqueous gel abrasive abrasive technology has been considered a big step forward. Ministry of Industry abrasive early in the 1980s began using sol-gel processing method to generate an abrasive. Mineral technology manager explained, The abrasive is to combine a boehmite, aluminum hydroxide and magnesium nitrate  polycrystalline diamond  product. Magnesium nitrate is used as a modifier. These gel generated on the liquid taken out, allowed the formation of massive precipitate. then it is crushed into a desired size. And finally into the furnace calcination. This has been improved, like the very dense ceramic corundum abrasive as new. The sol-gel method of the production of  synthetic diamond  corundum normal  abrasive grinding  compared to the advantages of a gel abrasive after calcination in the broken, thus eliminating the micro-cracks. Abrasive micro-cracks on the grinding pressure, causing premature wear of the main factors abrasive.

Abrasives Abrasives Company as an example to corporate tax planning for diagnostic studies

Abrasives company is state-owned enterprises from the past of modern enterprise system from the restructuring abrasives business, business tax planning lack of due attention, do not attach importance to the use of modern enterprise financial system, leading to high cost of corporate tax, the lack of financial competition advantage. This thesis is divided into five chapters, for example on the company Abrasives Abrasives  synthetic diamond  for diagnostic studies. The first chapter of the world and China Abrasives production and development trend analysis, the use of the five competitive  synthetic diamond powder  analysis of the abrasives industry competition, combined with the characteristics of the industry for the abrasives industry conditions, industry tax analysis of the characteristics; the second chapter reviews the related research and foreign tax planning, tax planning summed up the basic theory, combined with characteristics of abrasives industry, analysis of the use of tax planning; abrasives company's operating condition, tax features, and then combined with enterprise systems analysis features the BG abrasives company tax planning space;

Abrasive abrasive bending theory and design

Consider the workpiece from the initial processing to the sphere in the process of removal of the paraboloid and to establish the mathematical model and the ideal state derived abrasive density trend. Bending theory expounded abrasive and grinding tools, design,  abrasive wheels  of the abrasive abrasive on uneven density distribution method. The use of such  abrasive grinding  density abrasive grinding test results are analyzed and the theoretical calculation of worn grinding parabolic  synthetic diamond , the same as the general conditions using abrasive uniform density results, the conclusion is : the calculated density abrasive trend is positive, and the use of production based on this theory for parabolic speed grinding abrasive, abrasive wear can reduce the degree of unevenness, reducing the number of abrasive trimming.

Abrasive water jet theory and research status, proposed hydraulic squeeze-type abrasive water jet system model

Engineered and tested hydraulic squeeze-type abrasive water jet equipment prototypes. Come up with a site can be used for disaster relief, and penetration, crushing various materials (such as steel, steel, concrete, rock, etc.) hydraulic squeeze-type abrasive water jet way and equipment. This paper discusses the abrasive water jet  abrasive grinding  theoretical and research status, proposed hydraulic squeeze-type abrasive water jet system model, and use the theory of transient flow system is analyzed. Hydraulic squeeze-type abrasive waterjet system uses a small horizontal  lycrystalline diamond  abrasive chamber confining pressure from environmental media on the resistance caused by the jet. Environmental conditions at high confining pressure dynamic pressure under the jet axis apparent than in the non-confining pressure decay much faster;

High-pressure water jet rock breaking theory and its application in underground engineering basic research

Traditional abrasive water jet technology pump pressure, high cost, energy consumption, bulky and sophisticated system, not suitable for the application of post-disaster rescue scene. By the National Natural Science Foundation of Innovative Research Groups fund "high-pressure water jet rock breaking theory and its application in  abrasive wheels  engineering basic research" and the nation-building project level Graduate Students relying on the traditional premixed abrasive water jet  synthetic diamond  proposed a new type of hydraulic squeeze-type abrasive water jet formation mechanism and equipment for research; built hydraulic squeeze-type abrasive water jet system model; carry out the system's abrasive jet formation mechanism and abrasive nozzle wear mechanisms visualization experiments research;

Abrasive water jet cutting mechanism and key techniques of engineering ceramics research is still far from fully

Processed with special high quality and high performance of the new engineering ceramic products. It is widely used in machinery, electronics, aerospace, defense industry, bio-engineering and other fields. At present, China in abrasive waterjet  synthetic diamond powder  ceramics mechanism and key technology research is far from sufficient, domestic Abrasive water jet equipment mainly rely on imports. Furthermore, since the lack of abrasive water jet cutting depth study of the mechanism, the introduction of  synthetic diamond  has not been fully utilized, processed products of quality, efficiency and cost associated with the developed countries there is a large gap. Therefore, this study and further promote the implementation of the outcome, will increase the processing capacity of engineering ceramic products and expand the application fields of engineering ceramics.

Effect was due to the size of its impact will be reflected in the Raman spectrum in the mouth in order to properly assess the amount of deformation resistance

Result can be that the amount of the lattice constant is almost the particle size in recent years not only for decorative processing of diamond, regardless of the value was constant. And not in the cutting tool, coating, cooling plate, the speaker on a variety of all-just the right size pink blanket bundle lattice constant hatred in cubic boron nitride ​​vibrating plate spinning, optical windows and other areas have been widely used. Wave convergence, the half amplitude of the Bragg Raman spectroscopy showed FIG Eagle widely used size of the crystalline diamond film crystal fertile synthetic diamond between the half roundworm towers Movies County deformation degree and assessments. If the thin film thickness, the deformation of the movement curve will increase the Raman. Moreover, since the size effect had its impact will be reflected in the Raman spectrum in the mouth in order to properly assess the amount of deformation resistance, it is necessary to know the size effect of leaving the Raman spectrum changes causes.

Diamond powder and the former Soviet Union rather refined round of diamond powder

Static synthetic diamond powder catalyst method best carbon discussion Zhu Jiayong , Liu Zhongxiao , Zhang Xiao Xu , Xu Yumin ( Jilin Institute of Metallurgy ) ( rock graphite mine ) Abstract discovered a Type 3R content of up to about 30%, the degree of graphitization up to 94 % natural specialty graphite and successfully implemented with static method to touch coal direct synthesis of natural graphite diamond powder .diamond graphite conversion rate as high as 47 percent, complete crystal rate 76.2% , and so on more than 98% plot type , shape and type Ⅳ United States and the former Soviet Union refined diamond powder of diamond powder quite rounded , this paper introduces the best kinds of synthetic diamond powder specialty  polycrystalline diamond  main characteristics of natural and synthetic diamond powder used in the test situation . Introduction In the static pressure  Diamond blade  of diamond production , despite a lot of work , developed a variety of special graphite, transform a variety of ingredients, the development of new catalysts , and  Synthetic diamond  synthesis process parameters and process , graphite a diamond the conversion rate has been low ( 10% to 20% ) , severely restricts the diamond yield improvement and cost reduction. For this problem, in recent years to seek the best carbon source to do some work, made ​​with natural specialty graphite as carbon catalyst method using hydrostatic successful direct synthesis of diamond powder .

Has a very low turn-on and field emission threshold field strength, a large field emission current density and higher emission stability

Nanotubes having a smaller radius of curvature, the larger the aspect ratio, high conductivity, excellent mechanical strength and chemical stability, etc., making it ideal for field emission cathode material. The earliest research on carbon nanotube field emission is De Heer WA reported in 1995 in Science magazine published, followed by a large number of studies have shown that it has a very low turn-on and field polycrystalline diamond field strength, and a big field emission current density, and higher emission stability. Prepared using carbon nanotube field emission electron source  abrasive wheels  type flat panel display prototypes. Then there are some of the research team successfully demonstrated based on synthetic diamond powder as electron sources such as X-ray tube practical vacuum microelectronic devices. These devices are the core of the production process of an efficient carbon nanotube field emission cathode production. About CNT field emission cathode production there are three main methods: chemical vapor deposition, and electrophoretic assembly of printed carbon nanotube paste.

By electrophoresis approach makes superfine diamond deposition obtained at the cathode, carbon nanotube composite materials with ultrafine diamond

Field emission cathode materials research has attracted the eyes of many researchers . The field emission cathode for now , most of the reported a mere carbon nanotube film and diamond film . Carbon nanotubes have been shown to have good field emission characteristics , but also has a negative superfine diamond affinity and low . Therefore, considering the above factors , the ultrafine diamond carbon  cutting tools  and field emission properties of the material has a certain significance . In the preparation of synthetic materials , considering the ultrafine diamond in some organic solvents as its surface will absorb some of the charged ions , it will take a weak voltage. So make way through electrophoresis  synthetic diamond powder  deposition on the cathode to get this diamond ultrafine carbon nanotubes with the preparation of synthetic materials has important significance. Electrophoresis method used in the experiment , the diamond superfine the cathode substrate, thereby preparing a synthetic material , such an  Diamond blade  the PECVD method of carbon nanotubes on a substrate and the diamond growth ultrafine synthetic materials compared to more economical simple and practical, and easier to control . Final testing of field emission characteristics of the samples , and a comparative analysis with separate layers deposited ultrafine diamond , diamond film and field emission properties of carbon nanotube film .

Electrophoresis deposition of diamond coating sol charged ions in the applied electric field

Studied by electrophoresis on a silicon tip arrays powder layer deposited on the surface of diamond emblem made ​​of gold mesh Shinoda large area field emission arrays stone field emission characteristics . electrophoresis deposition diamond coating sol charged ions under the action of an abrasive grinding field, along with its electrodes of opposite polarity charge on the migration direction, a phenomenon known as cutting tools electrophoresis solution preparation: in deionized water, one drop of weak acid, the PH value of the solution was about 5. then, put Kim Assistant abrasive wheels , particle size of about 0.25 emblem meters and with it his power ultrasound solution mixing, preparation of a good electrophoretic fluid is milky white. electrophoresis process: anode electrophoresis electrophoresis pieces to be coated silicon tip arrays, materials an N-type, a sharp density of 25.

Vacuum microelectronics research hotspot collar city, and has been rocking on the field emission flat panel display applications

Diamond has many excellent properties especially, such as high hardness, high thermal conductivity, high chemical stability foot, etc., in the electrical performance, because it unique "negative electron affinity", it has a low work function, thus mention that the ideal field emission cathode material in recent years become a leading city of synthetic diamond powder research hotspot, and has been rocking on the field emission flat panel display applications for mattress; but most researchers in plasma  synthetic diamond deposition of polycrystalline diamond films for the study, the field emission characteristics are not satisfactory, mainly the presence of the starting field emission high emission current density is small.

Coating flaking and failure, which in turn resulted in high-speed steel coated tool performance deficiencies of instability

As a common high-speed steel cutting tool material, due to have a good process , strength, toughness and other advantages are still in use , especially in complex -shaped cutter blade manufacture and use has always dominant , but the high-speed steel cutting tools and carbide tools compared in terms of hardness , red hardness , wear resistance and so there are deficiencies, which restricts its use is more widespread in the late 1970s , the emergence of coated high speed steel cutting tools , only a fundamental change in the high-speed steel cutting tools , high speed steel to effectively solve the defects and deficiencies , but the coating thickness of the coated high  abrasive wheels  tools are limited , internal coating is easy to produce a large residual stress cracks , the coating flaking and failure,  cutting tools  resulting in high speed steel coated tool performance instability defects and shortcomings of higher prices in recent years, the application of nano-materials research has been involved in a number of areas , and have achieved more  grinding wheel  , which has become a priority research developed countries one of the hot authors utilize nanoscale diamond heat impregnation technique will speed steel cutting tools to strengthen the surface , the prepared tool has high strength, high hardness, high ductility , impact resistance , difficult corrosion, wear resistance, no penetration interface, ultra-fine grain material gradient tool , and this cutting tools do further research .

Metallic material by nano-diamond Hot Dip treatment, the hardness and wear resistance in the end, what changes have occurred

Conventional chemical treatment methods such as carburizing , nitriding , carbonitriding , etc., using a carbon , nitrogen atoms penetration into the material , especially metal sub-surface , thus changing the surface hardness, wear resistance and other mechanical properties. Although such treatment methods with lower production costs , but there are some drawbacks , such as handling complex process,  polycrystalline diamond  high hardness and wear resistance is not improved after treatment material permeable layer shallow, generally only tens to hundreds of micrometers , and nitrided layer interfacial bonding force is small, easy to peel , etc. The diamond as the hardest material in nature , its hardness and wear resistance has been widely recognized, and nanodiamond osmosis treatment process easy and  synthetic diamond powder , equipment requirements are not very high, penetration depth can be more than 20mm, processed steel structure and performance have undergone great changes. metallic material by impregnation nanodiamond heat treatment, the hardness and wear resistance in the end , what changes have occurred is unclear . article two kinds of metal materials , respectively  grinding wheel  treatment, the comparative experiments , the main test by nano-diamond heat treated metal material impregnated with the hardness and wear resistance are improved than carburizing treatment and observation and analysis of its microstructure changes that have occurred . choose one of two experimental conditions and methods of experimental material .

Material surface treatment in many ways, but its essence is substantially the same, all by changing the organizational structure of the surface material

Surface modification of metallic materials There are many ways , more traditional methods such as carburizing, carbonitriding , ion precipitation penetration, thermal spray technology , electroless plating technology, laser surface modification technology, although the material surface treatment in many ways, but is substantially the same, are the surface by changing the material structure in order to achieve the requirements . Briefly , chemical treatment processes are basically the chemical reaction medium , the diffusion boundary layer , surface adsorption and diffusion  Abrasive grinding  reaction and the process of four separate sub- component , but four processes associated with each other , each constraints are indispensable. Although these techniques mentioned above have many advantages, already in production and daily life have been widely used , and has achieved great results , but there are also  synthetic diamond  or penetration effect confined near the surface and other issues , the effect can not reach certain technical  Diamond blade . Such as the use of thermal spray technology to change the surface properties of materials , although the technology has a variety of base material for spraying , the cost is relatively low , significant economic benefits , etc., but there are also coated impact resistance and corrosion resistance is not high, the spraying process on the environment and harmful to the operator and other shortcomings . Another example carburizing treatment , although simple process, but relatively shallow depth of penetration , and thus in the actual production has significant limitations.

Discharge parameters that affect the dressing efficiency, trimming precision grinding wheel dressing effect and the key factor in performance

Ultra-precision grinding wheel diamond powder is ultra-precision machining technology research focus . The use of diamond powder grinding wheel for engineering ceramics and other brittle materials for ultra- precision grinding , grinding and polishing  synthetic diamond  the need , not only to meet the machining accuracy and surface quality requirements , but also greatly improve productivity and reduce processing costs. Ultra- precision grinding wheel diamond powder one of the key technologies of diamond powder dresser . EDM trimming method is an cubic boron nitride metal bond diamond powder wheel approach. Diamond grinding wheel dressing spark experiments showed that: discharge parameters that affect the dressing efficiency , trimming precision grinding wheel sharpening effects and performance of one of the key factors , thus finishing with a spark pulse power is very important. A metal-bonded diamond powder  polycrystalline diamond  dressing spark pulse power requirements analysis , including wheel dressing shaping and sharpening two parts. Shaping its axis of rotation of the grinding wheel surface satisfy certain geometric relationships between , for flat grinding wheel grinding wheel is to ensure roundness and cylindricity . Dressing is to make the surface of the abrasive wheel protruding to form a sharp cutting edge and the chip space .

Common use of mechanical grinding method for removing surface grinding wheel dressing blunt to resume grinding capacity

Ultrafine grained metal bonded superabrasive grinding wheel to achieve hard and brittle materials, precision and ultra-precision grinding is the recent emergence of a new processing technologies. Metal-based grinding wheel wear resistance and rigidity, but abrasive wheels . In general grinding wheel using mechanical methods for removing blunt surface finishing, grinding ability to regain it. However, this method is used for metal-based powder grinding wheel dressing superabrasive inefficient, and mechanical  Synthetic diamond  wheel dressing metal matrix binder Delta left behind, making the rear angle is zero and makes abrasive friction increases, which for powder Grinding is particularly affected. Different from  Abrasive grinding wheel  wheel, metal bond diamond wheel dressing powder shaping and sharpening into two stages. Electrolysis can also be used for shaping metal bonded grinding wheel, but due to the electrochemical reaction on the spark gap is not sensitive to the reaction, and the presence of chemical products of electrolysis shaping more complex, so the electrolytic shaping precision not high enough.

In order to obtain a surface roughness of a mirror surface, the wheel more favorable low rigidity

Rigidity support abrasive shape accuracy and surface roughness to ensure high shape accuracy of the wheel should be as rigid as possible. However, in order to obtain a surface roughness of a mirror surface, the wheel is more advantageous low rigidity. synthetic diamond powder the perspective of a rigid tool, ultra-precision mirror grinding requirements are contradictory. Rigid metal bonded grinding wheel, to ensure favorable shape accuracy, but it is not easy processing of the degree of synthetic diamond of the mirror, dressing difficult to achieve this level, the grinding accuracy and rigidity requirements are very demanding. High elasticity of the resin binder, with vibration absorption, and easy to make highly uniform cutting edge prominent; resin grinding wheel during grinding abrasive rotary phenomenon occurs with authigenesis effect.

With the decoration industry continues to develop, on the shape and size of stone products have become increasingly demanding

With the decoration industry continues to develop, on the shape and size of stone products have become increasingly demanding. A large number of CNC and automated processing  polycrystalline diamond  stone processing industry, decorative stone processing technology is generally divided into:  abrasive grinding  - coarse - fine grinding - grinding. Among them, the fine grinding and fine grinding stone restricting processing efficiency and accuracy of the main factors that also affect the CNC machine tools in the stone  Diamond blade  the main reason for the popularity. Therefore, the study grinding process has very important significance. Introduce a lot of information about Granite Grinding Mechanism, little about the actual production of grinding process.

Abrasive wear resistance sheet specimens, other materials can also be used to determine the sample plate or sheet Abrasive wear resistance

Rolling wear test is the so-called wheel disc at a predetermined load in contact with the rotating condition, so that the sample be worn, and measured the amount of wear tests. This method is suitable for the determination of plastic plates, sheets and  cutting tools  wear resistance,  cubic boron nitride  can also be used to determine the plate or sheet specimens abrasive wear resistance. The rolling wear tester used by the rotating disc, grinding wheel, loading device, abrasive dust  Polycrystalline diamond , repair wheel drive and other components. Economy, productivity, pleasant degree and green management, etc.; greenness on the grinding process evaluation system and evaluation methods were studied, pointing out that the system's modules and evaluation standards and methods;

Copper bonded diamond grinding wheel for ceramic tile trim, have a longer service life

Copper bonded diamond grinding wheel for ceramic tile trim, have a longer life, less prone to crimping ceramic defects, but trimmed smoothness over resin bond diamond  synthetic diamond . Metal bonded diamond grinding wheel machining ceramics, rough surface, chipping, chipping serious, product processing quality is not high. Resin bonded diamond tools  grinding wheel  resin and polyimide as a binding agent, has a good grinding characteristics of smoothness, but the common drawback is poor in heat resistance is not durable in the preparation and use of the process on  cutting tools  and operate personnel hazards; polyimide heat resistance than phenolic resin, but its price is higher, the high cost of preparing diamond tools, and more for large feed coarse carbide and other materials. In addition, the resin bond diamond tools, while preparing convenient, but secondary curing time-consuming long, resulting in the production cycle is too long.

AZS fused refractories has compact structure, high thermal stability, good wear resistance

Fused refractories is to meet directly after high temperature melting and casting process to produce materials, due to general electric arc furnace melting batch, so the cast molded product called fused products. Successfully developed a cast AZS, in the early 1950s, the use of industrial materials alumina instead of impurities developed cast AZS oxidation process, the formation of fused zirconia corundum refractories. AZS  synthetic diamond powder  has compact structure, high thermal stability,  Diamond blade , corrosion resistance and other characteristics, and its successful development and application of glass from the industrial development has played a particularly important role, greatly improving the glass  abrasive wheels , extend the life of liquid glass furnaces, has greatly improved the glass manufacturer's technical and economic indicators. Currently, the glass tank furnaces liquid contact with the glass wall and bottom and other parts, widely used at home and abroad AZS masonry, float glass production line of its glass furnace melting parts of the parapet, a small mouth, oblique neck strings, end of the wall, the wall, corner, initial layer are made of corrosion-resistant zirconium corundum refractories.

Initial wear stage, normal wear and rapid wear stage stage

Metal cutting process, tool wear is bound to happen . Although a variety of tool wear , wear different reasons . But the tool wear process have a common feature, namely the tool wear process can be divided into three stages: the initial wear stage , normal wear stage and rapid wear stage . Only to find a different cutting tool , cutting conditions in different tool wear and machined surface quality variation of children , in order to provide  synthetic diamond  cutting basis, and further grinding wheel of the metal cutting process [ the effective control of the state . To explore the process of cemented carbide tool wear machined surface quality variation , as well as the process of tool wear of the blade edge radius change and its impact on the quality of the machined surface , the author conducted a carbide  cubic boron nitride  alloy tool wear process and change the machined surface quality Tong experimental study , the choice of Zhuzhou Cemented Carbide plant YDOS grades of carbide cutting tools , tool first universal tool grinder on the sand with a resin bonded diamond grinding wheel , and the grinding synthetic diamond grinding machine with green grinding.

Tool wear in the form of tool wear of the tool in the normal cutting process

Tool wear in the form of tool wear is the cutting tool is in the normal process, due to physical or chemical action, the tool has the effect of wear. In the cutting process, the tool rake face and flank face with chip and workpiece, and generates  polycrystalline diamond , while in the contact  synthetic diamond powder  high temperature and pressure. Therefore, as for the cutting, before the flank wear will occur. Tool wear has the following three forms. The rake face of tool wear shape wear (crater wear) in the cutting of plastic material, if the cutting speed and cutting large thickness tends to grind the surface of the first crescent knife.

Involute tooth profile with a line and an arc tooth meshing characteristics uneven contact with the advantages of tooth profile

In recent years we have developed a line meshing gear, both with involute tooth profile wire meshing characteristics but also has a convex arc tooth profile tooth contacts advantages. Theoretical and experimental research results will now be summarized as follows.cubic boron nitride profile of the original conditions to take the tool  synthetic diamond powder  for the axis line Z, to take over the node straight lines perpendicular to the centerline axis evening, and take the top of the tooth profile is positive, the roots tooth profile is negative. Let the original  cutting tools  equation is creating "f (x) (15) Thus, the wire meshing tooth profile is the first condition of the original tooth tooth profile curve to be symmetrical about the origin, the original f (a x) = a f (x) (16) line of the second tooth profile of the original tooth profile of the conditions to be continuous monotonic rise function.

Class of non-circular gear design and manufacturing is no longer a bottleneck in the application

Non-circular gear transmission mechanism can achieve variable ratio transmission, suitable for printing, textile, agricultural machinery, instrumentation and other areas where a non-uniform motion, but because of its pitch curve and the computational complexity of the tooth profile design, 3D modeling and processing difficulties,  Synthetic diamond  been universal. In recent years, with CAD / CAM and CNC machining technology, the rapid development of non-circular gear design and processing class is no longer a bottleneck in the application, its advantages increasingly being played.  Abrasive grinding  non-circular gear mechanism is an eccentric cylindrical gear and its conjugate composed of a non-circular gear, the agency using the eccentric gear outside conjugated non-circular gears meshing to achieve non-uniform  Diamond blade , select the appropriate amount of eccentricity and center distance to form the desired non-uniform transmission ratio and angle relationship. The reason capstan eccentric gear, the eccentric gear may be used because the general manufacturing method, the processing is easy, and low cost. Many scholars of non-circular gear is designed to do the research on computer-aided design of oval gear research on non-circular gear pitch curve design theory has been studied;

Gear is an important quality indicators

Conjugate tooth profile of the slip rate is the relative sliding of two arc tooth profile and the tooth profile over the limit of the ratio of arc length. Slip ratio is larger, more serious tooth wear, friction loss also, it is an important quality gear indicator. Sliding engagement means zero rate of pure rolling between the tooth surface, it would reduce the friction between the teeth and wear. Engagement means such slip rate constant under the conditions of a pressure of the tooth profile of polycrystalline diamond , good tooth. In this paper, a rack meshing tool for the media on the plane of zero slip sliding engagement drive and wait for the theoretical derivation. The proposed: parameters via a toothed rack cutter  abrasive grinding of a sliding catch rates of tooth profile, two drawn flat rigid sliding engagement zero does not exist in the conclusions of the tooth profile, three other proposed slip rate of the presence of tooth profile vehicles range. Discussion only symmetrical tooth rack tooth profile conjugate tooth profile, because only this tooth profile greater practical significance.

According to the different processing technology is mainly divided into the following three categories: roll method sheets, thick flakes and paper pulp France France flakes

Tobacco sheet, also known as reconstituted tobacco, is tobacco stems, tobacco dust, such as shredded tobacco cigarette tobacco produced during machining material,  grinding wheel  and chemical means to be reassembled made ​​use of tobacco products. According to the different processing technology is mainly divided into the following three categories: roll method sheets, thick flakes and paper pulp France France flakes.  synthetic diamond production of tobacco sheet mainly dominated tobacco sheet of paper making, paper making tobacco sheet bulk of its good  Diamond blade and good resistance and good processability characteristics of gaining the favor of the world tobacco industry, and its applications are also increasingly The more extensive.

Computers in the heat treatment applied research in the field of increasingly active

The application of heat treatment has a long history, but in practice there are still not able to produce satisfactory results, mainly in two aspects: first, low productivity and high cost; second rejection rate, economic poor. As part of its internal heat treatment process occurs very complex physical and chemical changes, so long failed to identify effective solutions. Development and application of  polycrystalline diamond  to solve these problems provided the conditions. Computers in the heat treatment applied research in the field of increasingly active. Heat treatment applied to the field of computer technology has made ​​a lot of achievements, which greatly promoted the development of heat treatment technology.  synthetic diamond  technology is a key technology areas. Vacuum heat treatment expert system is a computer technology, artificial intelligence technology and  abrasive wheels  technology integration of the product, they will apply to vacuum heat treatment and vacuum heat treatment process optimization control of process parameters on the conventional vacuum heat treatment technology can achieve quantitative, intelligent oriented and precise control.

Non-smooth surface structure theory is the theoretical basis of bionic PDC bits

Smooth surface structure is not typical soil animals have the following properties: adhesion, resistance slow, high strength, good wear resistance. First, Mole, earthworms, beetles and other soil animals typical example of the animal's bionic system.  synthetic diamond powder  structure theory is the theoretical basis of bionic PDC bits. Based on past experience, to bionics theory, combined with the smoothness of PDC bits bionic theoretical model development rules,  cubic boron nitride principle. This article mainly on bionic experiment type PDC bits are introduced, while the traditional analysis and comparison of PDC bits, which can show that when the drill rock drill bit wear, friction, wear resistance and non-smooth surface structure and other properties.

Exploitation of underground resources are facing more and more difficult mining conditions, the status of mining deeper strata

The emergence of underground drilling technology resources are constantly being mined. Currently, the exploitation of underground resources are facing more and more difficult mining conditions and mining deeper strata conditions. So difficult mining  Diamond blade  not only reduce drilling efficiency, reduce service life, even destroy the drill bit. Under such adverse geological conditions,  Synthetic diamond PDC bit is not applicable. Therefore, in complex geological conditions, how to improve productivity and increase the bit extraction become a new issue in the field of drilling. In this paper, drilling technology and bionics theory, combined with PDC bit design theory and techniques are discussed.

Comparing different pilot hole diameter two-stage PDC bit bottom-hole stress field, preferably a pilot hole diameter

Downhole drilling process and after the formation of the bottom three states stress field, the preparation of the finite cubic boron nitride program. The analysis has been a series of downhole drill stress field. Contrast double-stage conventional PDC bits PDC bits and downhole stress field studies to improve its mechanical mechanism ROP. abrasive wheels  the different pilot hole diameter two-stage PDC bit bottom-hole stress field, preferably a pilot hole diameter. ② application of non-Newtonian  abrasive grinding , drill string and drill bit hydraulics hydraulics theory deduced two-stage flow distribution system of equations and parameters affecting the simplified formula, prepared a two-stage flow distribution and nozzle combination design process.

For two-stage PDC bit more comprehensive study has important significance

With the increase in deep and ultra-deep, φ311mm diameter hole section and a larger increase and improve the deep wells of large diameter section of ROP has become an urgent need to solve the main problem. Two-stage PDC bit drilled through a  polycrystalline diamond  release stress and  cubic boron nitride  free surface, effectively improve the ROP. In this paper, two-stage PDC bit more comprehensive study has important significance. ① In rock excavation and finite element theory and method, based on the established two-stage conventional PDC bits PDC bits and bottomhole finite element model. Proposed using three time steps simulated truthfully spud.

Abroad has been very importance of new cutting teeth, using different forms of cutting teeth, a variety of new products have been developed

PDC bits are geological drilling industry has been more widely used, but mainly for drilling soft to medium hard homogeneous formation, but also not suitable for drilling hard formations. Drilling workers at  cutting tools  in recent years gradually in different strata of PDC cutting teeth the best structure and the best fabric tooth design, PDC bit better for the geological drilling industries. PDC cutter PDC bit is the basic cutting units, on the merits of its structural performance PDC polycrystalline diamond  has a decisive influence. Has always attached great importance to domestic and foreign research new cutting teeth, the use of different forms of cutting teeth, has developed a variety of new products, more representative of a  Synthetic diamond , pre-chamfered edges to strengthen the tooth, a protective layer covering cutting teeth, teeth and other composite structures. In the application of certain conditions, these special cutting teeth morphology significantly improved performance.

Because rock composition, structure, mode of occurrence of different surface

Rock mechanics characteristics are the basis for geotechnical studies, because rock composition, structure, mode of occurrence of different surfaces, leading to differences in the mechanical properties of rock, for geotechnical engineering should be a combination of different environmental conditions and engineering requirements for rock physical characteristics, in order to determine the economic  polycrystalline diamond design and technical feasible engineering control measures to provide basic data. In this paper, Panzhihua Zhu mine Dongshan head deformation and failure of slope landslides example, through the structure of the surface shear slope rock mass, in situ shear, unloading and rheological rock mechanics test,abrasive wheels geological conditions, evaluated Dongshan head rock mechanical properties, recommended engineering control measures required to determine the physical and mechanical parameters and applied in practice, and achieved good results.

Downhole drill string on a very good state of motion simulation platform

In order to better study the downhole drill string motion state, the establishment of underground process simulation laboratories, downhole drill string have a good state of  synthetic diamond  platform, but the bottom of the drill string in motion by the radial and axial force and torque measurement at home and abroad without ancillary measuring equipment. Therefore, development of a set of  cubic boron nitride  measurement of the system, so that the bottom of the laboratory of the state of motion of the drill string has the ideal measurement tool. A  cutting tools  the basic structure and principle, the overall structure of the measurement system for analog drillstring range of different diameters and different specifications for, the development and adoption of hardware are: ① four-component force sensor, 2 sets of ranges are 12kN type and 4kN type; ② speed sensor; ③ signal modulation circuit;

Theory and engineering practice raised a lot about the state of motion in the underground drillstring different assumptions

For decades, research drillstring mechanics and foreign scholars based on different research objectives and methods, theory and engineering practice raised a lot about the state of motion in the underground drillstring different assumptions, of guiding  Diamond blade  for the engineering  abrasive grinding  so drillstring dynamics theory developed rapidly, but most force on the drill string and drill string movement's findings are based on theoretical analysis,cubic boron nitride and other methods come. In actual drilling equipment using existing data measured in the field with a certain one-sidedness, up from the economic considerations quite feasible.

Transformation of old wells for oilfield undertaken a research work

Transformation of old wells for oilfield undertaken a research work. Reaming drill bit for the current existing problems, this paper refer to the relevant provisions of the manual drilling,  Synthetic diamond  the existing design methods and oilfield drill specific geological conditions, the proposed drilling reaming or drilling reaming after a under conditions suitable for the job slimhole adjustable PDC drill bits, drill bits and PDC adjustable hydraulic characteristics,  polycrystalline diamond  field, the form of distribution of the teeth mechanical properties of drill and many other areas were analyzed. Reducing PDC drill bits hydraulic structures related to work performance quality and length of life.