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(1) machining of ceramic materials
(2) ceramics grinding, polishing process
(3) drilling of ceramic materials
Ceramic engine, aerospace, chemical mechanical engineering applications, such as ceramic parts, usually the need for drilling holes. In particular, the holes with a thread processing is the processing of ceramic materials is highly demanding process operation. Mechanical drilling method at present only a few mm ceramic processing holes. Processing needs of small holes ultrasound, laser, EDM, and machining of composite processing technologies, such as processing.
1947 BRLazarenko EDM, such as a hard metal material new ideas. The late 80's, the introduction of EDM technology is the field of ceramics processing. Study shows that: when the single-phase or ceramic / ceramic, ceramic / metal composite material is less than the resistance 100Ω.m, the ceramic material can discharge processing, processing principle slightly.
According to the basic principles of electrical discharge machining, materials depends mainly on the electrical properties of machinable, thermal physical properties, such as: electrical conductivity, melting point, specific heat, thermal conductivity and so on.
EDM is the preparation of high-dimensional accuracy, low surface roughness, high-performance ceramic components of complex shape promising processing technology, in-depth study steps EDM process control, design and preparation of conductive properties and superior mechanical properties of composite ceramic materials The method is crucial for future development.
3. Ultrasonic Machining
Ultrasonic machining is the use of ultrasonic vibration produce a tool (mold), driven tools and ceramic components of the abrasive suspension, shocks and anti-mill for processing workpieces. With the three-dimensional tool feed direction, tool tip shape was gradually copied in the ceramic workpiece. Boron carbide abrasive is used, such as silicon carbide and alumina. The work of the general solution of choice for the water, to improve the quality of surface processing, kerosene or oil can also be used for liquid medium. Research indicates that: use of ultrasonic vibration of diamond grinding wheel for ceramic materials, the material removal rate increases with the processing and the increased intensity, and only reach a certain critical pressure, the abrasive grinding of ceramic materials have the role. The principle of ultrasonic processing slightly. Some ceramic materials processing ultrasonic process parameters shown in the table below.
4. Laser processing
Ceramic materials used in laser drilling and cutting, the normal laser power for 150W ~ 15kW. However, as with the discharge process, as the ceramic materials with low thermal conductivity, high-energy beam may be generated in the surface concentration of thermal stress, the formation of micro-cracks, large debris, and even fracture. Suitable for laser processing in the organic and inorganic materials such as ceramics for micro-drilling, micro cutting, micro-structure of production. Has been able to process a diameter of 4 ~ 5μm, deep-diameter ratio of 10 or more porous. Laser source is usually used for CO2 and Nd: YAG laser.
5. Composite processing
For different ceramic materials and ceramic materials of different thermodynamics, physico-chemical properties, the traditional mechanical processing technology continues to improve, while an endless stream of new processing technology. Traditional processing technology of high efficiency, low-dimensional accuracy, poor surface finish, a variety of new electrical, thermal, chemical, laser processing technology for processing high-precision, complex shape at the same time with a specific performance (electrical conductivity, chemical properties, etc.) of ceramic materials However, the low processing efficiency at the same time, the processing requirements of small size. In recent years, a variety of composite processing technology in the laboratory and engineering fields and application of extensive attention. A variety of composite processing techniques include: chemical mechanical processing, electrolytic grinding, ultrasonic mechanical grinding, electrical discharge grinding, ultrasonic machining EDM compound, electrolytic composite EDM processing, electrolytic processing of electrical discharge machinery, such as grinding compound. Engineering practice shows that: composite material processing technology to improve processing
Processing efficiency and improve the surface quality of materials, ceramic materials is one of the trends of technological development.
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