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Experimental investigations of machining characteristics of SiC in high speed plunge grinding
Chongjun Wu,Beizhi Li,Jianguo Yang,Steven Y. Liang 한양대학교 세라믹연구소 2016 Journal of Ceramic Processing Research Vol.17 No.3
Grinding is widely used as a productive technique for finishing ceramic components in the manufacturing industry. However,it is still difficult to achieve a satisfying finishing quality for scarce of comprehensive engineering investigations of damage-freeand economical techniques of advanced ceramics. This paper will utilize a high speed grinder to develop the grinding forces,temperature, grinding surface and subsurface features in high speed plunge grinding of SiC. The ductile grinding of SiC undera relatively high grinding speed will be investigated. A set of detecting equipment, including a rotating dynamometer and agrindable thermocouple, will be used to measure the online grinding forces and temperature. Besides, the subsurface damage,chips and ground surface will be examined by SEM micrographs. It has been found that ductile grinding of SiC can beachieved through a combination of the increase of the wheel speed and the control of grinding parameters. Via causing lowerforce and thermal effects, the critical value for ductile grinding of SiC can be greatly improved under high speed grindingcomparing to conventional speed grinding. Moreover, the grinding subsurface integrity will not be adversely effected thoughimproving material removal volumes under high speed grinding.
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Thermal Analysis of 3J33 Grinding Under Minimum Quantity Lubrication Condition
Zishan Ding,Jian Sun,Weicheng Guo,Xiaohui Jiang,Chongjun Wu,Steven Y. Liang 한국정밀공학회 2022 International Journal of Precision Engineering and Vol.9 No.5
With the increasing requirements of environmental protection, energy conservation, and low consumption, minimum quantity lubrication (MQL) technology has attracted people’s attention. In the grinding process, the cooling performance of MQL has always been the focus. In this study, considering the influence of the grinding wheel speed, grinding fluid flow rate, and gas pressure on the useful flow rate, the MQL grinding cooling performance was studied and analyzed, and the MQL grinding heat transfer coefficient model, grinding energy partition model and grinding temperature calculation model were established. Grinding experiments were carried out with maraging steel 3J33 as the experimental object, of which the results verified the accuracy of the model. The error of temperature calculation model is 9.45%. The influence of different parameters on the surface processing quality of the workpiece was studied through experimental results. The results show that the grinding wheel speed and gas pressure have a more significant influence on the useful fl ow rate of the grinding fluid. The grinding fluid flow rate but significant impact on the surface quality of the workpiece.
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