Abstract: Aiming at the problems that the welding parameters of the upper and lower pump bodies of a plastic clutch general pump were difficult to be determined in the rotary friction welding processes, a welding parameter design method was proposed based on the rotating friction welding temperatures. Based on quadratic orthogonal regression design and response surface method, a prediction model of friction surface temperatures was established by three welding parameters of spindle speed, welding pressure and number of turns during rotating welding. The melting points of clutch pump materials were obtained by different scanning calorimetry. Based on the analysis of the friction surface temperatures and the two-order response surface diagram of three welding parameters, a coupling model of welding parameters was established based on the prediction model, and reasonable welding process parameters might be designed according to the model. Through the evaluation of welding strengths, the rationality of the design method of welding parameters was verified. With the aid of a numerical control welding system, the mass production of clutch pump welding was realized, which shows that the welding parameter design method is feasible.

Key words: response surface methodology(RSM), rotary welding of plastic part, friction surface temperature, welding parameter design

摘要： 针对一种塑制汽车离合器总泵的上下泵体在旋转摩擦焊接工艺中焊接参数难以确定的问题，提出了一种基于旋转摩擦焊接温度的焊接参数设计方法。通过二次正交回归试验设计，采用响应曲面法，建立了由主轴主轴转速、熔接压力和旋转圈数3个焊接参数在旋转焊接时摩擦面温度的预测模型；运用差示扫描量热法获得离合器泵体材料的熔点;在分析摩擦面温度与3个焊接工艺参数的二阶响应曲面图的基础上，结合摩擦面温度的预测模型，建立了焊接参数的关联耦合模型;依据该模型即可设计合理的焊接工艺参数。通过对焊接件焊接强度的评价，验证了焊接参数设计方法的合理性。离合器泵焊接量产的合格率达95%以上，证明了该焊接参数设计方法的可行性。

关键词: 响应曲面法, 塑制件旋转焊接, 摩擦面温度, 焊接参数设计