扫描电子束表面抛光不同倾斜角度的斜面温度场分析

Temperature Field Analysis of Inclined Surface with Different Tilt Angles of Scanning Electron Beam Surface Polishing

为获得综合性能良好的模具产品,研究不同倾斜角度斜面的扫描电子束热抛光技术是非常必要的。利用有限元软件模拟45钢表面扫描电子束抛光的热作用过程,研究其温度场的分布规律。讨论束源功率、工件移动速度和扫描频率等工艺参数对温度场的影响。结果表明:在一定的范围内,最高温度与束源功率之间呈线性正相关。在功率相同的情况下,倾斜角度越大,最大温度梯度和最大温度梯度x、y、z分量也越低。当功率为540 W时,倾斜角度为0°的工件表面最大温度梯度约是倾斜角为5°的工件表面最大温度梯度的1.5倍。随着倾斜角度和工件移动速度的增加,材料表面的最大温度梯度和最大温度梯度x、y、z轴的分量呈现出非线性的降低。不同倾斜角度下,扫描频率过高会导致材料表面的温度梯度以及温度梯度x、y、z轴分量偏高。

In order to obtain a mold product with good comprehensive performance,it is necessary to study the scanning electron beam thermal polishing technology with different inclined angle bevels.The finite element software was used to simulate the thermal process of scanning electron beam polishing 45 steel surface,and the distribution law of temperature field was studied.The effects of process parameters such as beam source power,moving speed and scanning frequency on the temperature field were discussed.The results show that the maximum temperature is nonlinear with the beam source power.In the case of the same power,the larger the tilt angle,the smaller the maximum temperature gradient and the maximum temperature gradient x,y and z components.When the power is 540 W,the maximum temperature gradient of the slope with an inclination angle of 5°is about 1.5 times of the maximum temperature gradient of the horizontal plane.As the tilt angle and work piece movement speed increase,the maximum temperature gradient of the material surface and the components of the maximum temperature gradient x,y and z-axis exhibit a nonlinear decrease.Under different tilt angle,too high scan frequency can lead to a trend of higher temperature gradients on the surface of the material and higher x,y and z-axis components of the temperature gradient.