Engineering ceramics are brittle and difficult to machine materials, using traditional processing methods

Engineering Ceramics less susceptible to oxidation, corrosion resistant, high temperature and abrasion and excellent performance. With the development of processing technology, it has the possibility of substitution of other materials, but is also brittle engineering ceramics materials difficult to machine using conventional  synthetic diamond , to high processing costs, low processing efficiency, the processing quality is not satisfactory, and there are special shape processing requirements of the product is difficult to accomplish, limiting its range of applications. For  cutting tools , the abrasive water jet (AWJ) processing is cost-effective non-traditional processing techniques, it is not thermal, electrical, and chemical reaction process, the workpiece does not produce metallurgical, chemical or physical properties changes.

Abrasive jet is mixed with the fluid medium hard particles high pressure water jet

The oil is cleaned using sandblasting tubing with paint, but a lot of cleaning surface pitting, efficiency is not high. Abrasive Water Jet is a new development of a new type of high efficient jet,  Diamond blade  in many industries has been applied. In the UK, it is now generally believed that the metal surface treatment abrasive jet is the most appropriate method. The so-called fluid medium abrasive jet is hard particles are  synthetic diamond  water jet. After mixed abrasive jet is mixed with the appropriate concentration of abrasive slurry (such as quartz mortar body) delivered to the nozzle mixing chamber is injected into the mixing chamber high  abrasive grinding  jet acceleration, and went into the mixing tube, in mixing tube to obtain high-energy abrasive particles like high-velocity bullets sprayed into the work piece as inner and outer surfaces, the surface of the paint, rust, oil, etc. quickly clean up.

Radius horizontal well drilling technology by high-pressure water jet rock breaking

Into the nineties , the use of high technology to enhance the development of low permeability reservoirs and oil fields for enhanced oil recovery is to improve economic efficiency , ensure the stable development of an important measure. Radius horizontal well  synthetic diamond  by high-pressure water jet rock breaking , in the production of multi- layer direct drilled horizontal wells mouth radial distribution network , to achieve efficient development of low permeability reservoirs , the transformation of the old oil fields and enhanced oil recovery purposes,  polycrystalline diamond  in eastern China has good application prospects and strong vitality. The results from the preliminary study and field test situation, the use of rotating water jet in relatively soft formations or light oil in drilling, hole diameter of 80 ~ 110mm, to meet the requirements of oil and gas production , and have in depth about 1000m oil well drilled in  synthetic diamond powder  . However, if the radius horizontal well technology successfully applied even deeper reservoir depth of 2000m or harder formations , it is necessary to improve the jet rock breaking . Therefore, the purpose of utilization of abrasive water jet and rotary jet advantages and overcome their shortcomings , by experiment , researchers not only rock breaking ability, high drilling speed , but also has characteristics of drilling large diameter holes rotating abrasive jet . Abrasive Water Jet refers jet artificially added solid abrasive particles jet .

In confining pressure conditions, due to the simple jet or abrasive jet cavitation erosion crushing capacity increases with confining pressure decreases rapidly

If the energy of the jet can be fully utilized, then the erosion crushing capacity will further increase operational effectiveness will be greatly enhanced. In addition, with the development and utilization of marine resources accelerates, the deepwater drilling become an important direction of development at home and abroad, deep  grinding wheel  technology more  polycrystalline diamond  and attention. In confining pressure conditions, due to the simple jet or abrasive jet cavitation erosion  synthetic diamond  increases with confining pressure decreases rapidly, so the abrasive water jet cutting capacity to be improved. , Proposed the use of BP neural network to predict the depth of abrasive jet perforating rock breaking new method. By comparing the predicted values ​​with the experimental findings, the prediction accuracy of the method fully meet the engineering requirements for on-site applications provide theoretical support.

Complex non-linear relationship, the corresponding mathematical model is very difficult

Abrasive water jet perforation is a production by injection of technical measures is mainly used for low-yielding permeability, old wells, and other carbonate rocks cemented dense formations tip hole processing in order to improve the ability to penetrate the near wellbore, thereby to increase production by injection purposes. Since the nozzle diameter perforation depth, nozzle pressure drop, abrasive concentration, perforation time, displacement and lithology, and many other arguments,  synthetic diamond powder  is a complex nonlinear relationship, the corresponding mathematical model is very difficult. Artificial neural networks have the topological  synthetic diamond  a high degree of dynamic systems in parallel, it can be applied to effect the input state to obtain information output by the processing unit and a network to the connected components. Artificial  abrasive grinding  are the most widely error back propagation neural network, namely BP neural network, it has a powerful complex nonlinear function mapping capability. BP neural network technology used in the modeling of rock breaking perforation depth.

Cavitation abrasive jet coupling involves cavitation jet and abrasive water jet

Abrasive water jet cavitation ideas from muddy sand water conservancy and hydropower project construction and equipment for hydraulic blended abrasive damage. High head and large flow of water carrying sand concrete or metal materials can lead to the destruction of their scope  Diamond blade  or water cavitation wear is much more serious. Cavitation abrasive jet coupling involves cavitation jet  abrasive grinding  jet. Cavitation jet and abrasive water jet in petroleum engineering is widely available, such as self-resonating cavitating jet drills, abrasive jet perforating machinery to improve  abrasive wheels  speed, etc., play an important role in increasing oil recovery; coiled tubing drilling radial water Hirai technology, water jet assisted deep penetrating perforating fracturing technology is the use of abrasive water jet directly erosion casing and broken rocks.

Premixed abrasive water jet cutting brittle materials and plastic materials cutting mechanism

Previously mixed abrasive jet CNC system research, discusses in detail the overall program CNC system. Of CNC system hardware were designed and studied theoretically described the CNC system control software. On the relevant premixed abrasive water jet mechanism based on the study focuses on the premixed abrasive water jet cutting brittle materials and plastic materials cutting mechanism for premixed  cubic boron nitride  jet cutting technology popularization and application of theoretical support. Meanwhile, this paper uses a combination of theory and empirical methods, the cutting depth of the abrasive water jet mixing with the previous section  synthetic diamond  energy distribution, the establishment of premixed abrasive water jet cutting parametric equations. The data were obtained through experiments, and the Gaussian algorithm derived under the experimental conditions, steel cutting depth parameter equation.

Submerged state premixed abrasive water jet cutting concrete impact of the main parameters of the relationship with the cutting depth

Transformation and maintenance of the project , often involving cutting of concrete structures , such as construction and mining . Currently, broken concrete cutting that traditional methods ─ ─ mechanical cutting , drawback of the method is time-consuming , laborious , inefficient and working environment pollution. With new technologies emerging cutting , water jet cutting are also numerous reports of broken concrete , but premixed abrasive water jet underwater ( in a submerged state ) cutting concrete materials research has not been reported , and the submerged state cutting technology for the transformation of flooded mine and  synthetic diamond powder  are of great significance , therefore , experimental research in the submerged state premixed abrasive water jet cutting concrete impact on the main parameters of the relationship with the cutting depth . Premixed  synthetic diamond  jet cutting concrete underwater test apparatus including premixed abrasive water jet generating system and the target object ( specimen ) mobile systems and nozzle clamping devices. Premixed abrasive jet generating system has a piston implementation stage three supercharged , the abrasive tank is placed among the high-pressure circuit , so that the abrasive and water mix to form abrasive water jet through the nozzle , the target object ( specimen ) mobile systems with DC motor driven screw drive , thyristor rectifier circuit by adjusting the output voltage to achieve speed .

High degree of accuracy and surface roughness of the mirror at the same time the requirements of a growing demand for processing

Recently, the ceramics, semiconductors, and optical glass as the representative of brittle materials have become increasingly demanding precision, especially high degree of precision and mirror surface roughness also requires processing needs are growing, this abrasive wheels is known as ultra-precision mirror finish. For the semiconductor substrate, and computer hard drives and other parts of simple geometry, usually after the first  cutting tools , polishing processing methods. But for the outer cylindrical surface and complex aspherical mirror ultra-precision machining, grinding process must also meet the high shape accuracy and small surface roughness of the dual requirements.

On the material properties put forward higher requirements, forcing the research and development of materials to a deeper and more extensive expansion direction

As we all know , energy, materials and information are the three pillar industries of China's modernization , the material is vanguard , and its development is often the precursor of major grinding wheel change and signs , while the modern requirements of the development of new materials and gave a strong impetus. In recent years, such as electronics, heat , laser, aerospace technology, automatic control , energy and information processing , and many other areas of the rapid development of emerging technologies , the performance of the material put polycrystalline diamond requirements , forcing the research and development of materials to a deeper and more broad direction of expansion. As a new special ceramics , inorganic non-metallic materials , with its unique fine structure and multi-effect , a variety of performance rapidly and widely applied in materials  synthetic diamond  of vast areas stand out, to bring the ancient ceramics new vitality. This is because the melting point and hardness of the ceramic material than metal materials generally high, with also has good insulating properties and chemical stability ( especially resistance to corrosion , oxidation resistance ) , so that it is in many high technology applications in the field increasingly extensive. Wherein the oxide ceramic high temperature oxidation due superior performance, making it easier , cheaper , it is a large number of application areas and industrial production of a high-temperature materials . 2 Literature Review Alumina is an amphoteric compounds, ionic bonding , the Department of hexagonal crystals.

Hot isostatic pressing process and its influencing factors of fracture toughness and the corresponding toughening mechanisms

Cermet is an integrated high performance hard materials, wear, corrosion and heat resistance and other fields have broad application prospects. This paper uses X-ray diffraction, scanning electron microscopy, X-ray spectroscopy, transmission electron microscopy and other experimental means of cermet sintering, hot isostatic pressing process and its influencing factors of fracture toughness and the corresponding  Abrasive grinding  mechanisms and other content a systematic study, and the fine grain Mo_2FeB_2 cermet technology for the preparation of preliminary exploration. First studied the sintering temperature, holding time, heating rate and sintering  synthetic diamond  on cermets and properties. The results showed that the sample in the liquid near the (1030 ℃ -1080 ℃) to 2 ℃ / min heating rate, by 1250 ℃ vacuum sintering 40min, to the contraction of its consistent tissue is relatively uniform, relatively good mechanical properties. Studied cermets hot  abrasive grinding  treatment process. The results show that the hot isostatic pressing treatment increases cermet hard phase particle size, particle consolidation and dissolution - precipitation mechanism is the main reason for the increase of their particle size.

To improve the mechanical properties of ceramic materials and performance

The intrinsic brittleness of ceramic materials is related to its ability to issue a widely used key issues. In order to improve the brittleness of ceramic materials to increase their  grinding wheel , scholars have proposed various countries over the years Toughening mechanisms such as particle dispersion toughening, transformation toughening, microcrack toughening and synergy toughening etc., and a variety of materials such as grain boundaries stress  cutting tools , so as to better improve the mechanical properties of ceramic materials and the use of performance, increase reliability of its work. However, current research and toughening toughening mechanism in the choice of methods and design and other aspects still need to be further expanded and deepened. As diamond allotrope of carbon one.

Diamond grinding wheel, and, also through high-temperature high-pressure sintering of polycrystalline diamond into a variety of shapes...

Diamond powder is so widely used, it not only can be directly used to produce diamond polishing paste (synthetic diamondlapping paste), diamond grinding wheel (synthetie diamond grinding wheels), but, also through high-temperature high-pressure sintering of polycrystalline diamond into a variety of shapes (synthetie polyerystalline diamonds). currently, the domestic diamond industry generally uses NIMnC. Flake catalyst  grinding wheel  compound of the JRI, JR: type low-grade diamond, after repeated grinding, pickling (ie crushing method) obtained after particle size ranging from  Abrasive grinding , such process operation cycle length, energy consumption, diamond high material loss; explosive detonation synthetic  Abrasive grinding wheel  (ie impact method) findings; while domestic cubic press on the direct synthesis of diamond powder (ie static method) for research, documentation publicly reported much. this selection of SY an I-type powder catalyst directly in the cubic press last synthesized diamond powder, and its results are analyzed and discussed.

Metal powder and diamond powder wettability of different characteristics, in order to guide the choice of metal powder system

Diamond powder compacts in the role of high-power CO2 laser sintering process . Combined with diamond powder and metal powder bonded microscopic analysis of the state introduced the metal powder and diamond powder infiltrating the different characteristics of the metal powder system to guide the selection and design . Established a  synthetic diamond  powder sintering laser power and scanning speed with the relationship between the basic framework to facilitate the process parameter selection , design and optimization. Process Study showed that: ① sintered in a non- protective  cutting tools  Ti powder compacts is more susceptible to oxidation , powder for powder wettability is poor, wear resistance is lower. ② amount of laser power increases ( amount of the scanning speed decreases ) , is conducive to the densification of sintered parts and strong carbide forming elements on the diamond powder infiltration , but if the energy of the laser input  abrasive grinding  a certain threshold will result in fine powder burning . When the spot diameter is 8.5mm , the laser power of 550W, scanning speed 1100mm/min under sintering conditions , powder sintering tool has the best performance. ③ The same process parameters , since the laser heating and compacts composition non-uniformity , surface state powder and metal binding properties and differences . For the laser sintering process in a variety of different phenomena , the sintering mechanism were studied intensively .

Purification process of the ultra-fine diamond powder grading

Particle size and distribution width of two key technical indicators are in line with international advanced standards diamond powder classification technology. The paper also explores the purification process of the ultrafine diamond powder grading, purification and grading will combine. The reagent-treated fine powder was washed by , adding a certain proportion of the surface active agent, and observed under the microscope. By a large number of experiments, we developed a new purification method for fine diamond powder: the dedicated reagent strong  synthetic diamond , prepared open diamond agglomerates formed during impurities, which is due to high temperature and pressure such that the resultant diamond single crystal particles and the reaction raw materials, additives, catalysts and other  abrasive grinding  together and form, thus increasing the contact area of ​​the reagent, the effect to improve the decomposition of impurities, finally obtained purified to more than 99.95% ultra-fine diamond powder.

Processing of heavy large diameter thin-walled workpieces CNC machining aspects of our strengths

Processing of heavy large diameter thin-walled workpieces CNC machining aspects of our strengths, including large pitch trapezoidal thread processing is particularly prominent. We use imported carbide coated tools, make full use of CNC lathes lateral approach and alternate feed function to complete processing of thin-walled workpieces  synthetic diamond  thread. Have introduced a large number of world advanced CNC machine tools, high-speed five-axis machining centers, CNC machine tools in the introduction of these advanced and promoted, in the design, manufacture of  cutting tools  the original two-dimensional to three-dimensional design changes, product development from the ground to space products , diversified products. Thin, contoured, complex, difficult materials and other parts, is often encountered in routine work. In the CNC production process of many factors affecting the quality of products: machine tool performance and accuracy, processing steps, processing parameters, and trajectory of the tool, a reasonable method of clamping, cutting fluids, tool selection.

The introduction of a large number of world advanced CNC machine tools, high-speed five-axis machining centers

Processing of heavy large diameter thin-walled workpieces CNC machining aspects of our strengths, including large pitch trapezoidal thread processing is particularly prominent. We use imported carbide coated tools, make full use of CNC lathes lateral approach and alternate feed function to complete processing of thin-walled workpieces  synthetic diamond  thread. Have introduced a large number of world advanced CNC machine tools, high-speed five-axis machining centers, CNC machine tools in the introduction of these advanced and promoted, in the design, manufacture of  cutting tools  the original cubic boron nitride to three-dimensional design changes, product development from the ground to space products , diversified products. Thin, contoured, complex, difficult materials and other parts, is often encountered in routine work. In the CNC production process of many factors affecting the quality of products: machine tool performance and accuracy, processing steps, processing parameters, and trajectory of the tool, a reasonable method of clamping, cutting fluids, tool selection.

Conductor roundness measuring mainly by workers and frequent stops rolling wheels by adjusting the position of the right or the distance to complete

The advantages and disadvantages of ordinary carbide dies circular compacted stranded conductor production, was first layered twisted after rolling through multiple sets of  abrasive wheels  forming. Conductor  abrasive grinding  measuring mainly by workers and frequent stops rolling wheels by adjusting the position of the right or the distance to complete, require production workers have a higher technology and rich experience.  Diamond blade , this makes the control of the artificial stranded conductors are still generated when angular, round surface is poor, affecting the electrical properties of the cable, increasing the likelihood of breakdown of the cable. Later, as people used a circular carbide drawing die constant awareness will be applied on the conductor strands pressed molding process.

Surface smoothness directly affects the quality of the conductor shield layer

Rated voltage XLPE insulated power cable conductors usually circular compacted stranded conductor, the surface smoothness will directly affect the quality of the conductor and the cable shield using life.  synthetic diamond  pressed in two ways: one is  abrasive wheels  pressed; Another is pressed mold pull pullout. Pressed by the cable conductor molding pressed after drawing, bright surface, precise size. Based on the nano-diamond composite coating die and pressed analysis and comparison of ordinary carbide dies that nano-diamond coating pressed mold has long service life, high production efficiency, low manufacturing cost and quality advantages.

Tool and mold applications is extremely frequent

In the process of manufacturing machinery and equipment , tool and mold applications is extremely frequent , improve the working life of the tool and die , it can effectively reduce costs and improve labor productivity and reduce labor intensity . So, in what way to improve the performance of the tool and die is the easiest and most effective of synthetic diamond  and engineers first thought was coating technology , that is, to the original tool or mold as the substrate , coated with a hard wearing , low friction coating , you can have a multiplier effects. In a variety of coatings , is naturally the most desirable diamond ( diamond ) coating it. If you can put the magic diamond coat , the tool and mold can be more functional layers on the building. Diamond : Fascinating not only due to the beautiful synthetic diamond powder  diamond ( diamond ) is extremely precious stones , in people 's eyes flashing light it is often a symbol of status and wealth . However, there are many excellent  abrasive wheels  and chemical properties known : it is the highest hardness , thermal conductivity, preferably , also has excellent optical performance , not only with ultraviolet light, visible light, infrared light , but also by X-ray microwave ; diamond excellent chemical stability , capability at room temperature almost all chemical reagents ;

Diamond cutter running direction (direction scribing)

Grating ruling machine known as " precision machinery of the King" , its main working principle is to use the diamond cutter in a raster scored on an aluminum substrate having a certain shape groove array. It includes two orthogonal directions of motion , the direction of the grating substrate ( indexing direction) and the running direction of the diamond cutter ( scribing direction ) . Movement in both  synthetic diamond  precise fit , forming a periodic groove , grating ruling machine working process diagram depicts the process of the grating , the grating with the movement of the substrate , diamond tool within the specified time  cutting tools  and fall, lift off the knife process takes as much as possible to keep running stability , otherwise, it will cause the grating substrate and scored rail vibration , resulting in deterioration of the quality grating ruling lines . Lift off the knife speed and height should be adjusted according to the technical  grinding wheel  of real-time , off the knife position should reach micron level precision . In addition, the characterization before , according to the grating ruling process requirements , the need for preparation of diamond tool to adjust the adjusting work completed by the craftsmen , which requires lift off knife mechanism can be controlled manually . Traditional grating ruling machine uses a mechanical lift off knife mechanism , there is poor stability, mechanical structure complicated maneuver, precision and low defects , which directly affect ruled grating quality and production efficiency .