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.

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;

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.

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.

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 .

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.

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.

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.

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.

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.

Conduct drilling operations, under which a casing diameter will be smaller

In some fields deep within the block are still a lot of oil and gas reserves. For the development of this part of the energy, and therefore the original on the basis of the borehole drilling  cubic boron nitride  oil wells with 5 1/2 bushing diameter is ф123.7mm, if carried out on the basis of  Diamond blade , under which a casing diameter will be smaller, it is bound to the later development of oilfields with to a lot of abrasive wheels  . Therefore, the development of a demand to meet the Daqing oil field drilling, reaming or drilling reaming drill after a slimhole conditions PDC adjustable drill, the development of oil production has a very important value.

Parameters such as loop element quadrilateral has effectively solved the model

Valve working on a variety of loads were analyzed to establish the corresponding mechanical model. Because of its structure and suffered loads more complicated, this article uses a  abrasive wheels  8-node quadrilateral element of the model parameters such as the ring has effectively solved. In order to improve the life of reciprocating pump cone valve, built its structural optimization mathematical model, the objective  grinding wheel  largest integrated stress on the body, including the valve without the impact of constraint conditions, the valve clearance liquid flow rate constraint, size constraints and so on. The non-linear mathematical  Diamond blade  mathematical programming. According to the characteristics of the problem, this paper uses a fast convergence, stability, good sequential quadratic programming model was effectively solved.

Gradually carried out a study PDC bit drilling hard rock, and with the bottom driver made ​​a good effect

Oil and gas drilling industry, rock into soft, medium, hard three categories, a total of 10 indicators can be drilled, drilling in hard-over (5 or more) rock oil and gas drilling has been restricted to the deep development of the technical difficulties . As China's industrialization process accelerated, sustained and mineral resources, security of supply has become a people rich, the country strong and critical national security constraints. For drilling hard rock formations, geological  cutting tools  uses diamond bit drilling and oil and gas drilling industry addition to the traditional method using cone drill bits and diamond drilling, but also gradually got into the hard rock PDC bit carried out research and with bottom drive  abrasive wheels effect. Here will be described separately cone drill bits, diamond drill bits and PDC bits in hard rock drilling Application of the status quo. Two main rock bit tricone rock bit system, shown in Figure 1. Pressure and the rotational force of the drill under the action of gear teeth both  Diamond blade , resulting in a rolling, sliding and shock and vibration effects composite crushed rock, an impact on the rock, crushing and cutting shear, can significantly improve the mechanical drill speed.

Can be incorporated in a cage inside the atomic electron volatile

Since been found since the fullerene compounds has been rapid development. Currently, the synthesized fullerene carbon cage C atoms majority; However, for those less than fullerenes, due to its high bending geometry , it has a unique electronic properties,  polycrystalline diamond  and physicist attention. experiments confirmed that the cage can be mixed with volatile internal atomic electrons, atoms, or in a cage outside  abrasive wheels , atoms, so that pentagon rule does not meet the independence atypical fullerenes stabilized recently, such as the use of the latter method successfully prepared a new, C atomic ratio less atypical fullerenes, and their structures were  Polycrystalline diamond  biggest feature is adjacent pentagons with Four 8 Cl atoms adsorbed on the two adjacent vertices of the pentagon, and another two Cl atoms adsorbed on the two hexagons - pentagons - hexagon common vertex to form a cage-like structure stable. other hand, has been confirmed experimentally and theoretically, often used to stabilize the same halogen fullerenes.

Did not consider the issue of dynamic extent that these assessment criteria difficult to apply practical

DTSP optimization algorithm proposed assessment criteria, but it did not consider the issue of the degree of dynamic change, making these evaluation criteria difficult to apply practical. Therefore, the dynamic multi-objective TSP dynamic measure of the degree becomes more important. Similarly, the multi-objective TSP problem  synthetic diamond powder  degree of conflict between the goals of a great relationship, and there are experimental results show that the greater the degree of conflict, the more optimal solution, so the degree of conflict between the goals is a  abrasive wheels  optimization algorithm for TSP assessment needs to be considered an important issue. Synthetic diamond for multi-objective optimization problems, there have been some analysis of the relationship between objective methods, but these methods are not applicable to discrete multi-objective TSP. How to measure the extent of the problem and the problem of the dynamic correlation between objectives is a serious problem, its study is of great theoretical significance.

Synthesis of cubic boron nitride crystals are small

Cubic boron nitride and diamond also has similar physical properties, such as wide band gap, high thermal conductivity, low surface such as negative electron affinity, and cubic boron nitride is one of the few known substances in the diamond lattice constant , crystal structure, surface free energy very similar on both crystalline material. Since CBN is having so many advantages artificial crystal materials,  Synthetic diamond  on the nature of the research more and more people's attention. High quality cubic boron nitride crystals synthesized by high temperature and pressure. Since this method is the synthesis of cubic boron nitride crystals are small, about its electrical properties of facing great difficulties, such as semiconductor  cutting tools  measurements, conductivity measurement, piezoelectric and optical characteristics measurement. To obtain these important  abrasive wheels , can only be measured indirectly or simply to get some relatively qualitative result, although to some extent, reflect the nature of the cubic boron nitride, but the measurement data is not accurate in making these properties.

The cubic boron nitride particles and a binder composed of certain proportion

Single crystal cubic boron nitride having a high hardness, high wear resistance, etc., while overcoming the deficiencies of its anisotropy. Polycrystalline cubic boron nitride in accordance with the cubic boron nitride particles and a binder composed of a certain percentage of the sintered under high  cutting tools  and pressure, adding an  abrasive wheels  amount of the adhesive may be to promote the sintering, reduce the sintering temperature and pressure required and can improve the performance of the sintered body. Thus, the synthetic binder PCBN plays an important role. With a  Synthetic diamond  of titanium nitride, cobalt, aluminum as a binder, sintering at high temperature and pressure conditions, polycrystalline cubic boron nitride sintered body, the sintering pressure is 5Gpa, the sintering temperature range of 1250 ℃ -1650 ℃, the obtained sintered body samples polishing.

Majority of elemental metal or alloy which is difficult to effectively wetting and bonding

However, diamond is non-metallic material, which metal (or alloy) between strength, hardness, elastic modulus, and other aspects of the structure there is a big difference, especially the interfacial energy between the two so high that the vast most  polycrystalline diamond  metal or alloy which is difficult to effectively wetting and adhesion of diamond particles, the bonding is weak, limiting its scope of application. Therefore, the study of diamond and bond issues interfacial  Diamond blade  the metal and composite mechanism has a special significance. Given the current  abrasive wheels  polycrystalline diamond composite research status and problems to Hunan Provincial Natural Science Fund Project "polycrystalline diamond composite interface and composite Mechanism" (Project No. 00JJY2044) relying on the guidance of instructors and launched on the basis of previous work of this thesis.

Consider the workpiece material to match the mechanical properties, physical properties, chemical properties, but also requires a good economy

Depending on the tool material processing conditions, a reasonable choice is to design, manufacture and use of those tools is an important task. Tool material selection relies mainly on knowledge and experience, in addition to considering the workpiece material to match the mechanical properties, physical properties, chemical properties, but also requires a good economy. Over the years, foreign companies have  abrasive wheels  tool material is the main mode of trial cut method and the reference manuals and tools catalogs. With the application of computer technology, people began to select the database by cutting tool material. Select a suitable tool material knowledge representation, common rules or framework requires huge  synthetic diamond powder  and inference mechanism with suitable support, and to enable a comprehensive reflection of both tool materials with a variety of performance indicators to be workpiece material properties matching is very difficult. CBR is the latest development of artificial intelligence, with convenient access to knowledge, knowledge maintenance is simple, efficient and  Polycrystalline diamond to the quality and other advantages. CBR CBR advantage and its decision-making process is a field of artificial intelligence research hotspot in recent years, it is through modify the previous problem solving similar to solve new problems, such reasoning due to people's way of solving the problem.

Developed countries have successfully applied the technique of high-precision machining of the surface of the microstructure

Micro-structure of the surface because of its specific properties, such as optical characteristics, adhesion, friction, lubrication, wear resistance, etc., in the field of civil and military industry has a very broad application background. FTS-based ultra-precision machining technology because of its high frequency response, high positioning accuracy and other characteristics, has become a  Polycrystalline diamond  surface machining a mainstream technology. Currently, the application of this technology has been successfully developed to a high-precision machining of the surface microstructure, and industrial applications has been achieved. China the technology is still in its infancy, one of the key  Diamond blade  technologies not yet fully mastered, processing quality compared with other countries there is a certain gap. Based on this, this paper, based on micro-structured  abrasive wheels  machining FTS key underlying technologies were studied. Good tool path is to obtain high-quality micro-structured surface of the premise. FTS machining using micro-structured surface, the micro-structure of the surface morphology is determined by the spindle rotation, X to the slide plate and FTS common interpolation is made, which is the process of turning the conventional surface topography formed in different ways, so need to use special tool trajectory generation strategy, and because FTS travel is limited, and can not be directly processed substantially non-rotational symmetry value micro structured surfaces.