基于稳健性设计的磨料水射流参数优化

Optimization of Progress Parameters for Abrasive Water Jet Machining Based on Robustness Design

磨料水射流加工技术是非传统的加工技术，它依靠高压、高水速和高速砂粒磨料作用在工件上去除材料，而在磨料水射流切割加工过程中存在切割深度和表面粗糙度较难控制的问题。基于稳健性设计理论、变量分析和信噪比，利用L9正交试验，对磨料水射流的压力、磨料流量、靶距和磨料粒径等加工过程参数进行优化。分析了加工参数的影响优先级，得出了磨料水射流加工参数的最优值，建立了切割深度信噪比回归模型并通过检验证明模型可靠。稳健性设计前后结果对比表明，切割深度和表面粗糙度比优化前有明显提升，从而提升了磨料水射流的加工质量。在实际加工不锈钢304中验证了结果的可靠性和该方法的可行性，为磨料水射流加工技术的推广提供了指导。

Abrasive water jet machining technology is a non-conventional machining technology, and it relies on high pressure, high water speed and high speed sand abrasive effect on the work piece to cause material removal through erosion. But in the abrasive water jet cutting process, cutting depth and surface roughness are the difficult problem to control. Based on the robust design theory, the variable analysis and the signal- to- noise ratio, the parameters of the abrasive water jet, the abrasive flow rate, the target distance and the abrasive particle size were optimized by L9 orthogonal test. The influence of processing parameters is analyzed, then the optimal value of the parameters of abrasive water jet is obtained. The regression model of cutting depth SNR is established and the model is proved to be reliable. The results show that the cutting depth and surface roughness are improved obviously before optimization, which improves the machining quality of abrasive water jet. The reliability of the results and the feasibility of the method have been verified in the actual abrasive water jet processing of stainless steel 304. And it provides the guidance for the extensive popularization of abrasive water jet machining technology.