An investigation of workpiece temperature variation of helical milling for carbon fiber reinforced plastics (CFRP)
An investigation of workpiece temperature variation of helical milling for carbon fiber reinforced plastics (CFRP)
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碳纤维增强塑料（CFRP）螺旋铣削工件温度变化研究
DOI：
10.1016/j.ijmachtools.2014.06.008
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发表时间：
2014-11-01
影响因子：
14
通讯作者：
Ren, Chengzu
中科院分区：
文献类型：
--
作者：
Liu, Jie;Chen, Guang;Ren, Chengzu
更好地预测工件的温度分布对于提高切削工艺性能具有重要意义，特别是对于碳纤维增强塑料（CFRP）工件而言。本文建立了一个传热模型来研究螺旋铣削过程中CFRP工件的温度分布。根据螺旋铣削的特点，提出了两种热源，其几何形状被建模为半圆弧和直线。研究了每个热源相对于静止工件的复杂轨迹。在此分析基础上，提出了具有绝热边界条件的CFRP工件内非稳态三维传热控制方程。这个非齐次传热方程的求解过程包括两个步骤：首先根据传热理论将其转化为齐次方程；然后利用分离变量法求解齐次方程。基于齐次方程的解，详细研究了移动半圆弧热源和直线热源所导致的温度分布。为了计算螺旋铣削过程中的发热量，提出了一个切削力模型，并利用共轭梯度法求解了传入CFRP工件的热量分配。对CFRP进行了一系列螺旋铣削试验，实验结果与预测模型计算结果吻合良好。该模型可扩展用于优化切削条件和抑制CFRP工件的热损伤。（C）2014爱思唯尔有限公司。保留所有权利。
Better prediction about the temperature distribution of workpiece has a great significance for improving performance of cutting process, especially relating to the workpiece of carbon fiber reinforced plastics (CFRP). In this paper, a heat transfer model is developed to investigate the temperature distribution of CFRP workpiece in helical milling process. Depending on characteristics of helical milling, two kinds of heat sources have been presented, the geometrical shapes of which are modeled as semicircle arc and line. The complex trajectory of each heat source relative to the stable workpiece has been studied. Based on the analysis, unsteady state three-dimensional governing equation of heat transfer in CFRP workpiece with adiabatic boundary condition is proposed. The solution procedure of this nonhomogeneous heat transfer equation consists of two steps: it is transformed into homogeneous equation according to the heat transfer theory firstly; and then the homogeneous equation is solved using the separation of variables. Basing on the solution of the homogeneous equation, the temperature distribution resulting from the moving semicircle arc heat source and the line heat source has been studied detailedly. In order to calculate the heat generation in the helical milling process, a cutting force model is presented and the heat partition transferring into the CFRP workpiece is solved using the Conjugate Gradient Method. A series of tests of helical milling for CFRP are conducted, and the experiment results agree well with the results calculated by the predicted model. This model can be extended to optimize the cutting condition and restrain the thermal damage of the CFRP workpiece. (C) 2014 Elsevier Ltd. All rights reserved.