Abrasive grinding can effectively prevent surface damage caused by the process of large particles, and simultaneously improve processing efficiency and accuracy

Efficient, high-precision , low surface damage has always been ultra-precision machining pursuit of the goal . With the development of modern industry, for ultra-precision  synthetic diamond  are increasingly high requirements , reduce surface damage and processing to improve the processing efficiency of the contradiction between the increasingly prominent. To alleviate this problem, the research center proposed a fixed abrasive machining and free abrasive machining of semi- solid integration with grit abrasive machining technology, the core of which is the use of having a "trap " effect of semi- fixed abrasive grinding with ultra- precision machining. The abrasive surface can effectively prevent damage to the grinding process caused by large particles , simultaneously improve processing efficiency and accuracy. References of conventional abrasive manufacturing process ,  synthetic diamond powder  the characteristics of semi- fixed abrasive grinding tools , grinding tools for semi- fixed abrasive manufacturing process has been improved, made ​​more perfect machining process. By combining experimental study and additives , determining suitable for semi- solid formulations with abrasive grit . Referring to the traditional abrasive characteristic parameter detection method chosen hardness , shear strength, compression ratio of the key parameters and spring rate , abrasive grinding of these organizations as a semi- fixed abrasive grinding evaluation index , Construction of the evaluation system of semi- fixed abrasive grains . According to the characteristic parameters of semi- fixed abrasive abrasive grit to establish a semi- fixed abrasive PFC models.

Mechanical parts surface finishing field of research and development has rolling mill, magnetic grinding, honing squeeze

Mechanical parts surface finishing field has research and development of new technology, new methods rolling mill, magnetic grinding, extrusion honing, electrolytic chemical polishing, ultrasonic polishing, each method of solving certain problems have very good results. However, whether it is the traditional method or the recently  synthetic diamond powder  are deficient, such as the processing of irregular surfaces, poor control more difficult and do not have the full capability of precision optical cavity surface. This is an urgent need to develop new, more  polycrystalline diamond  to the problem of new abrasive and finishing processes. Compared with the traditional processing methods, magnetic liquid abrasive finishing method has unparalleled advantages, its advantages body in liquid magnetic abrasive finishing method is suitable for finishing outside the irregular surface of the part and the cavity, which because the magnetic grinding fluid rheology, before applying the magnetic field which is a good flow of the liquid, and can fully contact with the cavity surface of the workpiece;

Water by adding abrasives (ie, abrasive water jet) is to improve the performance of an important way jet

For higher pressure jet working condition, basically limited to some of the research sector from abroad pressure generator and jet equipment research work. Attempts have been made in the high-pressure water jet technology, and continue beyond the new high record Generally said current level of technology enables people to use 200 ~ 400 MPa  synthetic diamond  while with further increase the pressure in the device and the device manufacturing, material, cost and other aspects of life will be limited, there is also the use of security .70 years, people began to note exhausted improve the work efficiency of the jet, focusing on research work  synthetic diamond powder  not too high but with a high-performance jet mechanism, for example, additives jet, 'pulse jet, resonance jet, jet and abrasive water jet cavitation in an attempt to lower operating pressure, achieve a higher economic  cutting tools , added to the water abrasive (ie, abrasive water jet) is to improve the performance of a jet important way. abrasive jet high pressure water jet and general different, it is a highly concentrated jet of energy, the working medium is water and a mixed solution of abrasive particles.

Abrasive water jet cutting metal materials physics

Abrasive jet cutting is not subject to the cutting position and the eccentric bushing restrictions, thus becoming obsolete wellhead and riser removal and effective means. Based on the theoretical analysis of cavity expansion abrasive jet cutting metal materials physical process, the establishment of a single abrasive particle  synthetic diamond powder  depth calculation model, obtained the higher jet pressure, the use of high density and with a sharp angular abrasive can significantly improve the cutting efficiency of the law, as the construction work is  synthetic diamond  category provides a theoretical basis. Were submerged jet under pressure, nozzle diameter, number of nozzles, cutting head speed, cutting duration, standoff distance, abrasive quality copies, abrasive type on cutting depth effect.

Mainstream mechanical cutting techniques in cutting, shaped cutting and blasting abrasive jet cutting

With the offshore oil and gas exploration and development progresses, a number of offshore platforms have completed their mission, platform removal has become a hot project. Platform is one of the key technologies demolition waste wellhead and riser  synthetic diamond  of the current foreign mainstream mechanical cutting techniques in cutting, drilling tablets cable cut, shaped blasting abrasive jet cutting and cutting. As is  synthetic diamond powder  by the multi-layer casing and  Diamond blade  cemented together and there may be eccentric, but need to cut at 5m below the seabed, drilling and mechanical cable cutter grain cutting method is difficult to meet the project needs, and shaped cutting due to blasting a greater damage to the environment, gradually limit the use of;

Mainstream mechanical cutting techniques in cutting, shaped cutting and blasting abrasive jet cutting

With the offshore oil and gas exploration and development progresses, a number of offshore platforms have completed their mission, platform removal has become a hot project. Platform is one of the key technologies demolition waste wellhead and riser  synthetic diamond  of the current foreign mainstream mechanical cutting techniques in cutting, drilling tablets cable cut, shaped blasting abrasive jet cutting and cutting. As is  synthetic diamond powder  by the multi-layer casing and  Diamond blade  cemented together and there may be eccentric, but need to cut at 5m below the seabed, drilling and mechanical cable cutter grain cutting method is difficult to meet the project needs, and shaped cutting due to blasting a greater damage to the environment, gradually limit the use of;

Mainstream mechanical cutting techniques in cutting, drilling tablets cable cut, shaped cutting and blasting abrasive jet cutting

With the offshore oil and gas exploration and development progresses, a number of offshore platforms have completed their mission, platform removal has become a hot project. Platform is one of the key technologies demolition waste wellhead and riser  synthetic diamond  of the current foreign mainstream mechanical cutting techniques in cutting, drilling tablets cable cut, shaped blasting abrasive jet cutting and cutting. As is  synthetic diamond powder  by the multi-layer casing and wellhead riser cemented together and there may be eccentric, but need to cut at 5m below the seabed, drilling and mechanical cable cutter grain cutting method is difficult to meet the project needs, and shaped cutting due to blasting a greater damage to the environment, gradually limit the use of;

To overcome the resistance caused by compaction effect

Oil (water) wells drilled, causing stress redistribution, borehole stratigraphy affected stress increased compaction effects occur, rock fissures occur in varying degrees within the pores closed, so that the formation of porous and fractured connecting  synthetic diamond powder  becomes too narrow, permeability reduction, fluid flow resistance increases, flow rate, flow rate decreases, oil production wells, water injection wells decreased. Especially late in oilfield development,  cubic boron nitride  drops, not enough to overcome the resistance caused by compaction effects, crude oil can not flow into the wellbore by a borehole formed within the dead wells, thus eliminating the oil wells near wellbore compaction effect, restoring the original formation some penetration as well stimulation, well stimulation, enhanced oil recovery essential way.

Wells abrasive jet cutting seam, sew the body fluid in the flow

Abrasive jet cutting seam technology is developed in an eighty year-end for releasing pollution and expand the near-wellbore permeability reservoir permeability of the new technology , with a penetration depth , no secondary pollution, the discharge area, the effect is significant construction and so on. But there are still many problems with the air compared to the free water jet , underwater jet  synthetic diamond  is also less . Especially for submerged conditions, high-speed non-free two -phase jet theory needs further study. The abrasive jet wells slotted body fluid flow at the seam , the movement of the solid particles ,  synthetic diamond powder  changes with time , the second return and the jet of fluid as the direction along the kerf attenuation rate few studies . To solve the above problems , this paper uses a theoretical and numerical investigation of the combination of research methods. The use of two -phase jet theory and   Diamond blade fluid dynamics and other basic knowledge , analysis wells abrasive jet slotting two-phase fluid motion mechanism . Gambit pre-processing software application , based on test results to establish the ground and underground seam 2D and 3D model of the body . Based on FLUENT software carried out on the two-dimensional numerical simulation of abrasive jet slotting process provides a theoretical basis and experimental evidence .

Slotted on casing strength analysis demonstrated slotted the casing does not have a big impact

Slotted casing strength through the impact on the analysis demonstrated slotted the casing does not have a big impact. Based on the above findings establish the mathematical model,  synthetic diamond powder  element analysis software ANSYS slotted wells around the well before and after the stress changes the numerical simulation results slotted rock  polycrystalline diamond  the well and spread the scope and impact analysis. Finally, the derived yield well before slotting the mathematical expression of the slotted slotted front and rear output compare output notes further explain and demonstrate the well stimulation mechanism and slotted slotted on yield changes.

Amorphous silicon thin film will not be light-induced attenuation effect (SW effect), it is considered highly efficient

Not only polycrystalline silicon thin film made ​​of silicon material having a bulk high mobility and high stability characteristics, and will not be an amorphous silicon thin film light-induced attenuation effect (SW effect), it is considered a high efficiency, low cost solar cell is ideal materials. Preparation of polycrystalline  synthetic diamond powder  mainly solid phase crystallization (SPC), excimer laser crystallization (ELA), metal-induced crystallization (MIC) and chemical vapor deposition (CVD) 3 ways. Of which the first two processes more complex, polycrystalline  synthetic diamond  prepared by metal induced the research team also made some more ideal research, Xia Donglin and other aluminum-induced electric field assisted prepared a  Diamond blade  silicon thin film. However, the polysilicon thin film metal induced high levels of metal impurities can not be directly used in the production of solar cells absorbent layer. CVD method, a hot filament chemical vapor deposition (HWCVD) has a low-temperature, low-cost, fast growth characteristics, and there is no plasma bombardment, little damage to the film.

If it is a different wheel designs will not, or how it will affect the accuracy of trajectory knife

Wheels, also called wheel. Grinding machine designed to split from two wheels, respectively, the upper and lower knives mounted on a position. This paper first discusses the wheel  synthetic diamond  the exact trajectory, but do not explore what the second "wheel of the processing should be grinding wheel  and other similar problems, and the third study is whether what kind of knife grinding wheel designed to make access to accurate trajectory. In other words, if it is a different wheel designs will not, or how it will affect the accuracy of trajectory knife. So,  synthetic diamond powder  side to split into knife knives centered on top of the wheel and under the knife under the wheel design is less known. In the tanning industry, from wet blue leather split between the world of new technology has been widely adopted because of the fresh human attention, researchers shortage. But most are "Because domestic aircraft do not know much, especially its structure described below" or "its merits numerous reports have been made" and so can not be obtained in a village a good article, does give future generations to enlightenment and thematic studies on the structure and properties of a split might affect rare.

CBN preparation, properties and n-type doping

CBN because of its high hardness, high thermal stability and chemical stability, excellent physical and chemical properties, and much attention. In recent years, cubic boron nitride thin films and properties of international research has been one of the hot, but it is also one of the difficulties. This paper studies the preparation of cubic boron nitride, nature and content of the n-type doping. RF sputtering on Si synthetic diamond powder  were successfully prepared high-quality cubic boron nitride film, reached the international advanced level. And a negative substrate bias voltage of the RF power on the preparation of cubic boron nitride thin films of cubic Abrasive grinding is deposited on the P-type substrate, the target for the h-BN target, the sputtering gas is a mixture of argon and nitrogen and Cheng, sample preparation process, the substrate plus DC negative bias. Film composition by infrared absorption spectroscopy and X-ray photoelectron spectroscopy logo, film morphology observed by atomic force microscopy. Experiments show that cubic boron nitride thin film nucleation and growth conditions of the window is very narrow, so difficult to synthesize cubic boron nitride films. To get the cubic boron nitride film, a negative bias can not be less than 90V, the power can not be less than 200W. When the negative bias of 200V, 300W, when the film cubic phase content of 92.8%.

Metal bonded diamond grinding wheel machining ceramics, rough surface

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 wheel differential. Metal bonded synthetic diamond powder  wheel machining ceramics, rough surface, chipping, chipping serious, product processing quality is not high. Resin bonded diamond tools typically phenolic resin and polyimide as a binding agent, has a good cutting tools characteristics of smoothness, but the common drawback is poor in heat resistance is not durable in the preparation and use of the process on the environment 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.

Grinding performance using a metal-bonded diamond grinding wheel for machining

Surface roughness is poor, even in the processing of micro-cracks on the surface of the part edge is easy to "dregs" and form a "gap." These issues, quality assurance for aeronautical products are not allowed. Grinding performance can only be used excellent metal-bonded diamond grinding wheel for processing, but the metal-bonded  synthetic diamond powder wheel self-sharpening nature (ie, self-trimming) is poor, blunt after trimming is also very difficult. mechanical trimming  abrasive wheels  used (such as silicon carbide grinding wheel rolling) diamond particles during trimming off more, wheel loss, trimming slow, harsh operating conditions in order to solve metal binding.

Cutter tooth surface to be machined with gear tooth surface is a point contact

Machinery and equipment, the extensive use of the gear. High-precision, high-efficiency gear processing methods of research, improve gear precision processing technology and application technology, the machinery manufacturing industry is facing an urgent task. Hardened gear honing method is the high efficiency of precision machining method honing technology to improve manufacturing precision of the gear significance.  synthetic diamond powder  tool in the machining process, the tool is machining the gear tooth surface and tooth surface is point contact, the whole cutting type honing tool will achieve line contact, that is the tool tooth and all are involved to do the cutting, resulting in the gear being processed meet  polycrystalline diamond  of the premise, greatly improving the tool cutting capabilities and tool life was extended. Introduction honing honing principle. Gear honing process is shaped by honing honing wheel and gear meshing for freedom, equal one pair of crossed helical gears, using the tooth surface between the relative sliding velocity and pressure Heng cut processing, mainly for hardened gear the final processing. Traditional honing and full cutting honing. Traditional honing wheel tooth involute, according to differential geometry shows that the tool during machining the tooth surface to be machined with gear tooth surface is a point contact.

Honing tooth surfaces are involved in cutting all the effective range

Throughout the process of honing cutting, honing tooth surface to be machined gear tooth surface will achieve line contact along its  Abrasive grinding  tooth meshing line cutting, honing tooth surface so that all of the valid range are involved in cutting (so called full cutting ), so that the ability to greatly improve the cutting tool, the tool life was extended. The research was supported by the technology in Shanxi synthetic diamond powder  and technological project funding. This paper focuses standard involute gear teeth on the whole cutting type honing surface design done basic research and discussion. Whole cutting type honing wheel involute tooth surface is cylindrical envelope surface, which is more complex mathematical equations.

Processing honing tooth surface to be machined gear tooth surfaces

Hardened gear honing is a highly efficient method of precision machining, precision manufacturing the gear which plays an important role. Therefore, honing technology improves precision manufacturing of the gear has a very important significance. Common  synthetic diamond powder  tooth involute helicoid tooth in the process of honing the workpiece surface and the tooth surface is a point contact, and thus the processing  abrasive grinding is relatively low, limiting the ability of the honing tool into full play. In this paper, ordinary honing wheel this deficiency, the whole design of honing the cutting type were studied. Full Duty honing wheel is engaged gear machining based on the study proposed a new hardened gear honing tool.

Curing light curing resin abrasive properties of

By analyzing the classical theory of the mechanism of adhesion, for the light-curing resin is characterized, discusses a photocurable resin for binding the abrasive mechanism,  synthetic diamond powder , from two angles of abrasive particles and a binder made ​​a series of improvements with light-curing resin abrasive performance measure. Studied the light-cured resin bonded abrasives curing mechanism. Analysis of the diamond  abrasive wheels  and other fillers curing light curing resin abrasive performance, and then select the light-cured resin blade as the research object, the blade curing mechanism is analyzed and modeled by the model experiments verified. Finally inside the light curing resin abrasive light quantity distribution discussed.

The new sub-nanometer resolution coaxial laser profile measurement system

Theoretically elaborated coaxial laser profile measurement technology principle, analysis of the impact test system vertical resolution and horizontal resolution of the main factors. And on the basis of the theoretical research, developed a new type of  abrasive wheels  resolution coaxial laser profile measurement system, which is mainly used to measure ultra-fine  synthetic diamond powder . The project developed by the sub-nanometer  Abrasive grinding wheel  profile measurement system is based on H_e-N_e double longitudinal mode laser laser as a light source, its operating frequency (beat frequencies) is 790MH_z. It applies not only static, but also dynamic measurement also has excellent characteristics.