As the saying goes: strong horse with strong saddle. In the modern manufacturing industry, major companies use a large number of advanced CNC machining equipment, but if there is no corresponding high-performance cutting tools, even the best machine tools cannot play its role. Therefore, the high-performance cutting tools will have, Processing efficiency, parts processing quality and the overall cost of the enterprise have a great impact.
The choice of tool material has a great influence on tool life, processing efficiency, processing quality and processing cost. When cutting tools, they have to withstand high pressure, high temperature, friction, impact and vibration. Therefore, the tool material should have the following basic properties:
1. Hardness and wear resistance.
The hardness of the tool material must be higher than the hardness of the workpiece material, generally above 60HRC. The higher the hardness of the tool material, the better the wear resistance.
2. Strength and toughness.
The tool material should have high strength and toughness to withstand cutting force, impact and vibration, and prevent brittle fracture and chipping of the tool.
3. Heat resistance.
The tool material has good heat resistance, can withstand high cutting temperatures, and has good oxidation resistance.
4. Process performance and economy.
Tool materials should have good forging performance, heat treatment performance, welding performance; grinding performance, etc., and a high cost-performance ratio should be pursued.
PCD (polycrystalline diamond) cutting tools are a kind of diamond cutting tools. Since the early 1970s, polycrystalline diamond (Polycrystalline diamond, referred to as PCD blades) prepared by high-temperature and high-pressure synthesis technology has been successfully developed. Replaced by synthetic polycrystalline diamond. PCD has a rich source of raw materials, and its price is only one-tenth to one-tenth of that of natural diamond, which solves the problem of scarcity and high price of natural diamond, and expands the application range of diamond tools to aviation, aerospace, automobiles, and electronics. Stone and other fields.
With the development of automobile lightweight, a large number of aluminum alloy materials are applied to the manufacture of automobile parts, which brings severe challenges to cutting tools. The PCD material has the characteristics of ultra-high wear resistance, low coefficient of friction and high thermal conductivity, which make PCD tools have excellent cutting performance, ultra-high efficiency and excellent product processing quality, and also make them into aluminum alloy parts The best choice for processing, it also provides the best guarantee for the high efficiency, high precision, high surface quality and low cost of automotive parts.
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The silicon carbide substrate preparation process mainly includes raw material synthesis, silicon carbide crystal growth, ingot processing, ingot cutting, cutting piece grinding, grinding piece polishing, polishing piece cleaning, etc.Among them, the key and difficult points of preparation are mainly the crystal growth, cutting, grinding and polishing links, which are the key points and difficulties in the entire substrate production process, and become the bottleneck that limits the yield rate and production capacity of silicon carbide.
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