Analysis Of The Mechanisms And Thermal Characteristics In Grinding Of Structure Ceramics

Structure ceramics are becoming popular materials for industrialcomponents, and grinding with diamond wheel has been widely used in theproduction of structure ceramics components. Virtually, all of the energyconsumed by grinding is essentially converted into heat distributingwithin the grinding zone. Concentrated heat input leads to temperaturerise on the surface of structure ceramics which may lead to thermaldamage to workpiece and grinding wheel. Therefore, it is necessary tostudy the characteristics of the grinding temperature and suppression ongrinding heat in grinding of structure ceramics. In this study, mechanism of ceramics grinding and characteristics ofgrinding temperature were evaluated with grinding forces andtemperature measurement in grinding of different ceramics under variousconditions. With the analysis of heat transfer during ceramics grinding,suppression methods of grinding heat with enhanced cooling andlubrication were presented to prevent thermal damage during the grindingprocess. The results indicated that most of the grinding energy must beexpended by ductile plowing, even though material removal is mainly bybrittle facture. Therefore, the specific grinding energy increases with thedecrease of material removal rate and grinding of ductile ceramic. Theconsumed energy is converted into heat distributing within the grindingzone where the ceramics interacts with the grinding wheel. Due to the lowthermal conductivity of structure ceramics and high thermal conductivityof diamond abrasive, most of grinding heat is transferred into diamondgrits and cause high tip temperature, which may lead to graphitization ofdiamond and softening of the resin bond. Adequately transporting coolantthrough the grinding zone or applying lubricant oil to suppress thefriction between the wheel and workpiece can effectively lower grindingtemperature.