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Analysis of grinding mechanics and improved grinding force model based on randomized grain geometric characteristics

查看全文 作　　者：Mingzheng [1]LIU;Changhe [1]LI;Yanbin [1]ZHANG;Min [1]YANG;Teng [1]GAO;Xin [1]CUI;Xiaoming [1]WANG;Wenhao [1]XU;Zongming [2]ZHOU;Bo [3]LIU;Zafar [4]SAID;Runze [5]LI;Shubham [6]SHARMA 高影响力作者 机构地区：[1]School of Mechanical and Automotive Engineering,Qingdao University of Technology,Qingdao 266520,China;[2]Hanergy(Qingdao)Lubrication Technology Co.,LTD,Qingdao 266520,China;[3]Sichuan Future Aerospace Industry LLC,Shifang 618400,China;[4]Department of Sustainable and Renewable Energy Engineering,University of Sharjah,Sharjah 27272,United Arab Emirates;[5]Department of Biomedical Engineering,University of Southern California,Los Angeles,CA 90089–1111,USA;[6]Department of Mechanical Engineering,I.K.Gujral Punjab Technical University,Jalandhar 144603,India高影响力机构 出　　处：《Chinese Journal of Aeronautics》索引2023年第36卷第7期,共34页高影响力期刊 基　　金：supported by the National Natural Science Foundation of China(Nos.51975305,51905289,52105264);the Key Project of Shandong Province,China(No.ZR2020KE027);the Major Research Project of Shandong Province,China(Nos.2019GGX104040 and 2019GSF108236);the Natural Science Foundation of Shandong Province,China(No.ZR2021QE116). 摘　　要：Too high grinding force will lead to a large increase in specific grinding energy, resulting in high temperature in grinding zone, especially for the aerospace difficult cutting metal materials,seriously affecting the surface quality and accuracy. At present, the theoretical models of grinding force are mostly based on the assumption of uniform or simplified morphological characteristics of grains, which is inconsistent with the actual grains. Especially for non-engineering grinding wheel,most geometric characteristics of grains are ignored, resulting in the calculation accuracy that cannot guide practical production. Based on this, an improved grinding force model based on random grain geometric characteristics is proposed in this paper. Firstly, the surface topography model of CBN grinding wheel is established, and the effective grain determination mechanism in grinding zone is revealed. Based on the known grinding force model and mechanical behavior of interaction between grains and workpiece in different stages, the concept of grain effective action area is proposed. The variation mechanism of effective action area under the influence of grain geometric and spatial characteristics is deeply analyzed, and the calculation method under random combination of five influencing parameters is obtained. The numerical simulation is carried out to reveal the dynamic variation process of grinding force in grinding zone. In order to verify the theoretical model, the experiments of dry grinding Ti-6Al-4 V are designed. The experimental results show that under different machining parameters, the results of numerical calculation and experimental measurement are in good agreement, and the minimum error value is only 2.1 %, which indicates that the calculation accuracy of grinding force model meets the requirements and is feasible. This study will provide a theoretical basis for optimizing the wheel structure, effectively controlling the grinding force range, adjusting the grinding zone temperature and improving the workpiece machining quality in the industrial grinding process. 关 键 词：Effective action area Grinding force Improved model Mechanical behaviour Randomized grain
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