航空电液伺服系统阀套珩磨材料去除体积预测研究

针对珩磨加工阀套孔生产率低、加工精度难控制等问题,开展了内孔珩磨技术研究,通过分析9Cr18不锈钢珩磨过程中材料去除率的变化规律,提出一套适用于珩磨加工的材料去除体积理论公式。同时为使珩后孔不同轴向位置处的孔径趋近一致,需要在上下越程处增设停留时间,以此改进初始模型。基于初始模型与优化模型分别开展单因素珩磨试验,结果表明,往复速度和珩磨压强是影响珩磨材料去除体积的显著因素,针对珩磨材料去除体积与珩后孔径差,优化模型与初始模型的预测结果分别与对应的试验结果对比,可发现优化模型预测精度相较于初始模型分别提高25%～30%。在越程段增设停留时间并不会降低加工效率,可提高珩后孔尺寸精度,实现材料去除体积的准确预测。

Research on Prediction of Honing Material Removal Volume of Aviation Electro-Hydraulic Servo Valve Sleeve

In view of the problems of low material removal rate and poor hole diameter uniformity in the honing process,the material removal rate of 9Cr18 stainless steel during the honing process was analyzed,and a set of material removal volume theoretical formulas suitable for honing process were proposed.At the same time,in order to make the hole diameters at different axial positions of the honing hole closer to the same,it is necessary to increase the residence time at the upper and lower overruns to improve the original model.Single-factor honing tests were carried out based on the original model and the optimized model.The single-factor test results showed that,reciprocating speed and honing pressure are significant factors that affect the removal volume of honing materials.Aiming at the difference between the removal volume of the honing material and the hole diameter after honing,the prediction results of the optimized model and the initial model are respectively compared with the corresponding test results,it can be found that the prediction accuracy of the optimized model is increased by 25%-30%compared with the initial model.Adding the resident time in the overtravel section will not reduce the processing efficiency,can improve the dimensional accuracy of the hole after honing,and realize the accurate prediction of the material removal volume.