The hardness of cubic boron nitride is second only to diamond, but it has superior heat resistance and chemical inertness to ferrous metal materials compared to diamond. Using these excellent properties of cubic boron nitride as an abrasive material, cubic boron nitride grinding tools are particularly suitable for grinding ferrous metal materials of various types. Its applications, complemented by diamond which is mainly used for processing hard and brittle materials, greatly expand the range of superhard material applications.
Compared to conventional abrasive tools, cubic boron nitride grinding tools have the characteristics of high speed, high efficiency, high processing quality, long life, and low cost, making them the top choice for high-efficiency, high-precision grinding on high-speed CNC grinding machines. They are widely used in industries such as automotive, machine tools, tools, and bearings.
The hardness of cubic boron nitride is far superior to other conventional abrasives. High hardness means stronger and sharper cutting ability;
Cubic boron nitride has high wear resistance, meaning it is harder to wear down than conventional abrasives. The ability to maintain the shape of the abrasive grains is one of the main characteristics of cubic boron nitride as a high-performance abrasive;
Cubic boron nitride has very high compressive strength, meaning it can keep the grains intact and not easily break under harsh conditions; cubic boron nitride has excellent thermal conductivity, allowing for cooler cutting during grinding. Due to the different properties between cubic boron nitride and diamond, the range of materials they can process is also different. Materials suitable for cubic boron nitride processing include tool steels, bearing steels, alloy steels, superalloys, and cast iron. Materials suitable for diamond processing include cemented carbides, glass, ceramics, cermets, and cast iron.
Cubic boron nitride grinding tools are tools made by bonding cubic boron nitride abrasives together with different types of binders and forming them into specific shapes. It can only maximize its function through reasonable grinding processes and relying on the superior performance of grinding machines. When researching and applying cubic boron nitride grinding technology, it is necessary to include cubic boron nitride grinding tools, grinding machines, workpieces, dressing, cooling, and grinding processes into a system and optimize them to achieve the best technical and economic effects. The following are several important factors to consider in cubic boron nitride grinding technology:
Cubic Boron Nitride Grinding Tools
When manufacturing and selecting grinding tools, the main considerations are their shape, size, cubic boron nitride abrasive grit size, concentration, binder type, and operating speed, among other parameters.
The shape, size, and marking of cubic boron nitride grinding tools are specified by the standards GB/T6409.2-1996 and GB/T6409.1-1994; Among the four binders used in cubic boron nitride grinding tools (resin, metal, ceramic, electroplated), ceramic binders have developed the quickest. This is because ceramic cubic boron nitride grinding tools offer high grinding efficiency, good shape retention, high durability, easy dressing, and long wheel life, making them the preferred choice for high-efficiency, high-precision grinding.
Grinding Machine
The grinding machine is the core of the grinding system, and its performance has the most crucial impact on grinding results, especially for cubic boron nitride grinding.
Increasing the working surface speed of the grinding wheel can significantly improve grinding efficiency, grinding ratio, and the surface quality of the workpiece. The operating speeds of 80-125m/s have become a basic feature of cubic boron nitride-specific camshaft grinders imported domestically. Using the highest possible speed is an important prerequisite for improving the technicality and economy of cubic boron nitride grinding.
Dressing
Using diamond rollers for dressing not only improves dressing efficiency but, more importantly, achieves better wheel topography. The accuracy of the dressing device's feed should be high, and the feed rate should be precise, down to micron levels. Excessive dressing negatively affects grinding quality and significantly reduces the wheel's life.
Cooling
Choosing the right type of coolant and the parameters of the cooling process correctly can often yield twice the results with half the effort.
Optimization of Grinding Process Parameters
Fully optimizing grinding process parameters can balance technical and economic indicators such as grinding efficiency, grinding quality, and grinding cost at higher levels.
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