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.

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 .

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;

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.

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.

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.

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.

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.

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.

New PDC coring bit circular contour abandon the traditional knife-wing design

Bit crown design Huaqing oil region to massive sandstone reservoir, ranging from thick mudstone  polycrystalline diamond , sand and wide distribution, thickness, drilling, and no gravel strata belonging to medium hardness, wear and tear with the other principles and other principles of combining cutting crown profile design, the new PDC  cubic boron nitride  contour abandon the traditional knife-wing design, with flat double-arc design, schematic cross section of drill bits PDC cutter contour selection based on  grinding wheel  being drilled lithological features, choose the 13mm diameter composite sheet as the main PDC cutting elements, select the taper of 30 ° of the new tines PDC PDC for the auxiliary.

Difficulty in retaining hole blocking, low pore

Currently, the situ leachable sandstone-type uranium deposits of uranium exploration in China has become the main type deposits. Our situ leachable sandstone-type polycrystalline diamond  exploration areas are mainly located in the north of the Mesozoic-Cenozoic basins, drilling, construction difficult, the production of the main problems are: (1) rock cores taken low; (2) Drilling Protection blocking difficulties into the hole low; (3) hole accidents; (4) drilling efficiency is low, construction costs are high; (5) eggs conglomerate drilling difficult. "Loose rock coring" and "gravel drilling" is a basin-situ leachable sandstone-type synthetic diamond of two important problems. Thesis topics from the Nuclear Industry Geological Bureau "fifteen" uranium geology research project "situ leachable  cubic boron nitride  uranium deposits loose rock coring technology research and its applications", introduces the author in recent years, "loose rock coring technique research "and" gravel coring technology research, "Some aspects of the research carried out and achieved some results.

Coring drill bit uneven distribution of the cutting surface of the teeth and flutes

Therefore, in the coring process, to ensure diamond cutting teeth rational flow of fluid around to adequately wash and cool the drill bit is very important. Coring drill bit uneven distribution of the cutting  polycrystalline diamond  tooth and the flute, the number of  cubic boron nitride g from a few to a dozen, the jet at the bottom of a very tight space constraints and irregular wall turbulence produces a very complex flow, a method of  synthetic diamond  analysis of this complex flow field distribution is almost impossible, and the flow field of the structure and properties of structural optimization was carried hydraulic drill, improving the basis for cleaning and cooling effect.

Costs or losses may also include the cost of production and non-production costs

Natural human transformation program planning and design process generally reflect maximize efficiency, minimize costs of this basic principle of optimization. Maximize efficiency, minimize costs is essentially a multi-objective optimization problem. Benefits may include a variety of benefits, such as economic and  cubic boron nitride  and social benefits; costs or losses may also include the cost of production and non-production costs associated with this or other objectives, such as environmental pollution losses. The overall design of the spacecraft payload, range, thrust and other indicators parameter synthesis is a typical multi-objective  synthetic diamond . Control engineering control system stable, accurate, and fast time-domain indexes and stable region degrees, the system bandwidth frequency domain characteristics of integrated problem is also a multi-objective  Diamond blade  of engineering design problems. There is also in the national economy and social development and long-term development plan optimization and decision making problems.

Computational Mechanics and modern design important research direction in the field of manufacturing

Structural optimization design can not only reduce the structural weight and material costs, but also to improve the structural strength, stiffness, vibration, buckling stability and other properties, is the design and manufacture of modern computational  synthetic diamond powder  and important research areas. This research consists of two parts: In the study analyzed the basic grinding wheel  of genetic algorithms and  cubic boron nitride recent research on the genetic algorithm based on structural optimization problem for the special nature and requirements of the genetic algorithm made ​​several improvements. In certain types of structural optimization problems apply this improved genetic algorithm.

In order to give decision alternatives, the algorithm must give a satisfactory solution in a relatively short period of time

The TSP (Traveling Salesman Problem, TSP) is a typical combinatorial optimization problem, has become and will continue to be testing the new algorithm hotspot combinatorial optimization problems. In the traditional TSP problem, the city's size and the distance between cities is fixed, but in practice, the size and cost of the problem is often the vector matrix dynamic changes over time, saying such issues as dynamic TSP. In order to give managers the right decision scheme, the algorithm must be based on real-time information in a relatively short period of time given satisfactory solution. Research on such issues, not only for all types of dynamic  cubic boron nitride  optimization  synthetic diamond  a theoretical reference, but also has a wide range of practical value. As an adaptive genetic algorithm for global optimization probabilistic search algorithm, with simple and universal, robust and strong,  Abrasive grinding  and parallelism, etc., has been successfully applied to solve combinatorial optimization problems. In this paper, an improved genetic algorithm to solve TSP problems, the main research work and innovation on the TSP problems were analyzed to establish a mathematical model.

Cubic boron nitride (cBN) is a mesh having a diamond-like structure

Boron nitride is typically covalent Ⅲ-V group compound, wherein hexagonal boron nitride (hBN) with lamellar graphite-like structure, cubic boron nitride (cBN) is a diamond-like network structure. And, like diamond, cubic  synthetic diamond  is a lot of excellent  cubic boron nitride in a multi-functional materials, its overall performance even more than diamonds. For example, cBN has a wide band gap (6.4 eV) and excellent thermal conductivity, by doping the N-type, P-type semiconductor, chemical stability and inertia between the high and the iron in the infrared to ultraviolet within the translucent so good.

Wear resistance has a strong directivity, the application is limited

Cubic boron nitride (referred to as CBN) is developed out of the mid-fifties superhard material hardness only to diamond, it has a high hardness, high thermal stability and high chemical inertness, but its hardness, wear resistance, which are highly directionality of application is limited. To compensate for the lack of a single crystal cubic boron nitride, the relevant researchers developed in the seventies  cubic boron nitride cubic boron nitride (referred to as PCBN), which not only has a single crystal of cubic boron nitride of high hardness, high wear resistance, etc. while   polycrystalline diamond 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 sintering temperature and pressure conditions.

Larger band gap, high working temperature

Cubic boron nitride is a synthetic wide band gap semiconductor material, the band gap of 6.4eV, cutoff wavelength of 193nm, suitable for DUV-blind detection. And other materials for UV detection compared with the following advantages: greater band gap, high working temperature; dielectric constant is small, parasitic capacitance, the device fast response; corrosion resistance, high-energy particle radiation, more suitable work in harsh environments; and material breakdown voltage. In addition,  Abrasive grinding wheel  current ultraviolet detector mechanism and structure of the work that the MSM photovoltaic and photoconductive structure type, PN junction, PIN junction compared to advantage. It is the dark current, short response time,  cubic boron nitride , structure process is relatively simple, the material requirements are not demanding. This thesis MSM coplanar electrode structure, by evaporation, photolithography, such peeling of the structure of the sample production process, and the substrate material used in accordance with, the electrode structure produced a variety of different samples, including a glass substrate is substrate as a substrate in a simple mosaic powder samples and to mosaic powder as substrate interdigitated structure sample.