Grinding Technology Development of CBN Grinding Wheel

Improving the quality of processing and the efficiency of grinding processing has always been an important goal in the field of grinding. The high-speed, ultra-high-speed precision grinding process is an advanced, high-quality and low-intensity developed manufacturing process technology in recent years. High-speed, ultra-high-speed grinding technology means that high-precision, high-automatic, high-flexibility manufacturing equipment can be reliably achieved with the super-hard abrasive grinding wheels to greatly improve the grinding speed to improve the material removal rate, processing precision and processing quality. CBN is cubic boron nitride with a microhardness of 800-900 MPa, which is slightly lower than diamond. However, its heat resistance (1400℃) is almost double that of diamond (800℃). Due to the poor thermal stability of diamond grinding tools, it should be used with speed limit, and the thermal stability of CBN abrasive grains is good, so CBN grinding wheels can be used for high speed and ultra high speed grinding. The metal removal rate is 10 times with CBN grinding wheels that of diamond grinding wheel. The CBN grinding wheel has a very long service life and can reduce the number of grinding wheel replacements in the automation of grinding operations.
In recent years, for the development of high-speed and ultra-high-speed grinding technology, it can be considered that the development of grinding automation, the development and application of various high-speed and high-efficiency grinding technologies, and the promotion and application of super-hard abrasives are the three main ways to improve the efficiency of grinding. Therefore, the general trend of high-speed, ultra-high-speed grinding technology is high flexibility, high automation system, super-hard abrasives (CBN grinding wheel) and various high-speed and efficient grinding technology. Effective measures for high-speed and high-efficiency grinding with high flexibility and high automation include automatic feed, automatic grinding cycle, automatic measurement, automatic dressing, automatic wheel balance, automatic indexing and automatic loading and unloading, etc.. With the development of CNC grinding machines, the grinding and machining center is also developing rapidly. It has on-line measurement, automatic exchange of grinding wheels, automatic exchange of workpieces, automatic dressing of grinding wheels, unmanned workpiece loading and unloading. The grinding center also has robots, transporting workpiece trolleys and coolant. The use of CBN superabrasives has greatly advanced the development of high speed and ultra high speed grinding technology.

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