Rayleigh heat flux distribution model investigation and workpiece temperature prediction in the cylindrical grinding
Rayleigh heat flux distribution model investigation and workpiece temperature prediction in the cylindrical grinding
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DOI：
10.1007/s00170-016-9220-1
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发表时间：
2017-04
期刊：
影响因子：
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通讯作者：
Jingzhu Pang;Beizhi Li;Yao Liu;Chongjun Wu
中科院分区：
文献类型：
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作者：
Jingzhu Pang;Beizhi Li;Yao Liu;Chongjun Wu
精确预测磨削温度的能力在提高加工质量和降低成本方面已在精密工程中得到验证。提出了一种新的基于接触区瑞利分布的磨削温度测量和热流模型。为了验证该模型的有效性，采用了一种嵌入式热电偶的方法，通过将可研磨的热电偶插入到工件中来测量表面温度。设计了一种基于Kistler 9347C的外圆磨削测力仪，并对磨削力进行了监测。根据监测到的温度曲线，用逆传热法计算了热流密度，并计算了实际接触长度。结果表明，与二次曲线热源模型相比，接触面上的热源是不对称的，更符合瑞利曲线。通过对实验磨削温度和磨削力的分析，得到了磨削过程中的能量分配。根据实验结果建立了实际接触长度模型和能量分配模型，对预测的工件表面温度和热流密度进行了验证，并与外圆插销磨削实验结果进行了比较，两者吻合较好。
The ability to accurately predict the grinding temperature has been demonstrated in improving machining quality and reducing the cost in precision engineering. This paper focused on a new grinding temperature measurement and heat flux model based on the Rayleigh distribution in contact area. In order to validate the proposed model, an embedded thermocouple method was adopted to measure the surface temperature through inserting the grindable thermocouple into the workpiece. A dynamometer using Kistler 9347C was designed for cylindrical grinding and the grinding force was monitored. Based on the monitored temperature curves, the heat flux was calculated with the inverse heat transfer method and the real contact length was calculated. The results indicated that the heat source along the contact area is asymmetric and more consistent with Rayleigh curve by comparing to the quadratic curve heat source model. The energy partitions to the workpiece were obtained by analyzing the experimental grinding temperature and grinding force. With the real contact length model and energy partition model base on the experiments results, the predictive model for workpiece surface temperature and the heat flux was validated and showed very good agreement with the experimental results in cylindrical plunge grinding.