A BREAKTHROUGH IN PRODUCTION GRINDING WITH BN WHEELS -A RESULT OF SYSTEMATIC SCIENTIFIC WORK

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Abstract
Several parallel paths are being pursued in the further development of grinding processes. On the one hand, since higher material removal rates are to be realized, machines of greater rigidity with more efficient drives and tools are required. On the other hand, increasing demands are placed on the quality of machined parts. One trend is towards the utilization of super hard abrasives such as cubic boron nitride (CBN). Advantages of this grinding material as opposed to the conventional corundum are significantly greater hardness and, therefore, longer profile life, higher material removal rates, and lower grinding temperatures. One disadvantage is the price of the tool, which is several magnitudes higher than for corundum. Considering the high initial costs for CBN cutting material, destruction of the wheel caused by faulty operation of the machine or undue allowance must have the aim of transferring supervision and control tasks from the operator to the machine control. Fundamental for this concept are suitable sensor systems for monitoring the grinding process. A constant normal grinding force achieved by regulating the feed rate avoids clogging and destruction of the wheel. In addition, the grinding time is reduced, since the bending of the spindle can be compensated.

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