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Grinding Temperature Modeling Based on a Time Dependent Heat Source

机译:基于时间依赖热源研磨温度建模

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Grinding is widely used as a finishing operation for improvement of surface quality.However,because of extreme ploughing and rubbing and high specific energy of the process the heat generation is very considerable.Some portion of the generated heat is transferred to the workpiece increasing its surface temperature High surface temperatures may cause problems such as surface burn,microstructural changes and phase transformations,reduced micro hardness,high residual stresses,white layer formation and decreased fatigue strength of the workpiece.Predicting of the grinding temperature is the first step for analysis and prevention of these problems.Because of the height differences of girts randomly distributed on the wheel,the grinding force is periodic The fluctuation is more pronounced when the grinding is accompanied by the wheel run out.Accordingly,heat flux into the workpiece is not continuous and is a function of both location and time.In this paper,a grinding temperature model is developed based on a time dependent heat source to predict temperature of the workpiece The proposed model is validated by measuring workpiece temperature.The results showed that the new model predict the maximum temperature of the workpiece 10-15 percent higher.A good agreement is observed between the model results and experimental data.
机译:磨削被广泛用作改进表面质量的整理操作。然而,由于极端耕作和摩擦和工艺的高特定能量,发热非常可观。产生的热量的部分被转移到工件上增加其表面温度高表面温度可能导致表面燃烧,微观结构变化和相变,减少微硬度,高残余应力,白色层形成和工件的疲劳强度降低。研磨温度是分析和预防的第一步在这些问题中。因为随机分布在车轮上的GIRT的高度差异,磨削力是周期性的,当磨削伴随着车轮伴随着磨削时,波动更加明显。根据,工件中的热通量不是连续的位置和时间的功能。本文,磨削温度模型是开发基于时间依赖的热源来预测工件的温度来通过测量工件温度来验证所提出的模型。结果表明,新模型预测工件的最高温度为10-15%。之间观察到良好的协议模型结果和实验数据。

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