成形磨削温度的理论与试验分析
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摘要
通过磨削弧区内直角三角形热源分布以及一维导热过程的简化,并基于平面连续磨削温度的理论分析,构建了成形磨削温度的数值计算模型。该模型首先能够对型面交界处平面与斜平面磨削热源的耦合作用进行描述,同时也能对型面交界处最易产生磨削烧伤这一现象进行定量化分析。依据平面磨削过程中砂轮与工件实际接触弧长和热量分配比例的理论计算模型,分别建立了成形磨削过程中平面与斜平面两个组成部分的热量分配比例计算方法。最后,设计了成形磨削温度的试验测试方法,通过成形磨削加工试验对数值计算模型的有效性进行了验证。试验结果表明,由于成形磨削过程中同时存在平面和斜平面两个磨削热源,二者之间存在耦合作用,从而导致平面与斜平面交界处的温升急剧增加,极易引起磨削烧伤。
Based on the thermal analysis of surface grinding, according to triangular heat flux and one-dimensional linear heat conduction, a numerical model for temperature calculation in form grinding is set up. Grinding burn was most likely to happen at the place of the junction of two adjacent planes in form grinding, the coupling effect of heat source at the junction is investigated and the reason could be quantitative analyzed by this model. According to the mathematical model of energy partition ratio and real contact arc length in surface grinding, the computational method of energy partition ratio in form grinding which includes plane and inclined plane grinding is determined. Experimental measuring method of the temperature in form grinding is designed; the numerical model for temperature calculation in form grinding had been verified by tests result. The result indicated that with the coupling effect of heat source in form grinding, the junction had the highest temperature rise which would induce grinding burn.
Based on the thermal analysis of surface grinding, according to triangular heat flux and one-dimensional linear heat conduction, a numerical model for temperature calculation in form grinding is set up. Grinding burn was most likely to happen at the place of the junction of two adjacent planes in form grinding, the coupling effect of heat source at the junction is investigated and the reason could be quantitative analyzed by this model. According to the mathematical model of energy partition ratio and real contact arc length in surface grinding, the computational method of energy partition ratio in form grinding which includes plane and inclined plane grinding is determined. Experimental measuring method of the temperature in form grinding is designed; the numerical model for temperature calculation in form grinding had been verified by tests result. The result indicated that with the coupling effect of heat source in form grinding, the junction had the highest temperature rise which would induce grinding burn.
引文
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[20]DONG Dapeng,GUO Guoqiang,YU Dedong,et al.Experimental investigation on the effects of different heat treatment processes on grinding machinability and surface integrity of 9Mn2V[J].Interantional Journal of Advanced Manufacturing Technology,2015,81(5):1165-1174.
[2]毛聪.平面磨削温度场及热损伤的研究[D],长沙:湖南大学,2008.MAO Cong.The research on the temperature field and thermal damage in the surface grinding[D].Changhai:Hunan University,2008.
[3]张磊.单程平面磨削淬硬技术的理论分析和试验研究[D].济南:山东大学,2006.ZHANG Lei.Study on mechanism and experiment of single-pass surface grind-hardening technology[D].Jinan:Shandong University,2006.
[4]ROWE W B,MORGAN M N,BLACK S C E.Validation of thermal properties in grinding[J].CIRP Annals–Manufacturing Technology,1998,47(1):275-279.
[5]MALKIN S,GUO C.Thermal analysis of grinding[J].CIRP Annals–Manufacturing Technology,2007,56(2):760-782
[6]GUO C,WU Y,VARGHESE V,et al.Temperatures and energy partition for grinding with vitrified CBN wheels[J].CIRP Annals–Manufacturing Technology,1999,48(1):247-250.
[7]MOHAMMADJAFAR H,BANAFSHEH S.Thermal analysis of minimum quantity lubrication-MQL grinding process[J].International Journal of Machine Tools&&Manufacture,2012,63:1-15.
[8]谢桂芝,黄含,徐西鹏,等.氮化硅陶瓷高效深磨温度的研究[J].机械工程学报,2009,45(3):109-114.XIE Guizhi,HUANG Han,XU Xipeng,et al.Study on the temperature in the high efficiency deep grinding of silicon nitride[J].Journal of Mechanical Engineering,2009,45(3):109-114.
[9]任敬心,华定安.磨削原理[M].北京:电子工业出版社,2011.REN Jingxin,HUA Dingan.Princple of grinding[M].Beijing:Publishing House of Electronics Industry,2011.
[10]MALKIN S,GUO C.Grinding technology:Theory and application of machining with abraives[M].New York:Industrial Press Inc.,2008.
[11]ROWE W B,BLACK S C E,MILLS B,et al Analysis of grinding temperatures by energy partitioning[J].Proceedings of the Institution of Mechanical Engineers Part B:Journal of Engineering Manufacture,1996,210(6):579-588.
[12]ROWE W B.Temperature case studies in grinding including an inclined heat source model[J].Proceedings of the Institution of Mechanical Engineers Part B:Journal of Engineering Manufacture,2001,215(4):473-491.
[13]GUO Changsheng,MALKIN S.Energy partition and cooling during grinding[J].Journal of Manufacturing Processes,2000,2(3):151-157.
[14]KIM N K,GUO C,MALKIN S.Heat flux distribution and energy partition in creep-feed grinding[J].CIRP Annals–Manufacturing Technology,1997,46(1):227-232.
[15]GUO C,WU Y,VARGHESE V,et al.Temperatures and energy partition for grinding with vitrified CBN wheels[J].CIRP Annals–Manufacturing Technology,1999,48(1):247-250.
[16]ROWE W B,MORGAN M N,BLACK S C E,et al.A simplified approach to control of thermal damage in grinding[J].CIRP Annals–Manufacturing Technology,1996,45(1):299-302.
[17]QI H S,ROWE W B,MILLS B.Experimental investigation of contact behavior in grinding[J].Tribology International,1997,30(4):283-294.
[18]言兰,融亦鸣,姜峰.氧化铝砂轮地貌的量化评价及数学建模[J].机械工程学报,2011,47(17):179-186.YAN Lan,RONG Yiming,JIANG Feng.Quantitive evaluation and modelling of alumina grinding wheel surface topography[J].Journal of Mechanical Engineering,2011,47(17):179-186.
[19]GUO Guoqiang,LIU Zhiqiang,AN Qinglong,et al.Experimental investigation on conventional grinding of Ti-6Al-4V using Si C abrasive[J].Interantional Journal of Advanced Manufacturing Technology,2011,57(1):135-142.
[20]DONG Dapeng,GUO Guoqiang,YU Dedong,et al.Experimental investigation on the effects of different heat treatment processes on grinding machinability and surface integrity of 9Mn2V[J].Interantional Journal of Advanced Manufacturing Technology,2015,81(5):1165-1174.