磨料水射流偏摆切割模型及试验

Modeling and experiment on cutting characteristics in abrasive waterjet machining with cutting head deflexion

为研究水射流切割特性,提高切割效率,使用量纲分析法建立偏摆切割的切深模型,并针对偏摆切割的切割特性进行试验研究.基于模型计算结果和试验数据分析了主要工艺参数特别是偏摆角度对切深和断面质量的影响.结果表明,模型能够较好地预测切深,偏摆切割可以起到加大切深和减少断面斜条纹的作用,可使切深增大的有效偏摆角范围随压力升高而扩大,最佳偏摆角度随进给速度增大而增大,随靶距提高而减小.

In order to improve the machining efficiency of abrasive waterjet cutting,a model of the depth of cut was set by using dimensional analysis. Experimental study was conducted to investigate the characteristics of oblique cut. The influences of the processing parameters especially the deflexion angle on the depth of cut and the cut surface quality were obtained through analyzing the modeling calculation and the experimental data. The results show that the model gives good predictions,the cutting head deflexion can increase the depth of cut and decrease the striation on the cut surface. The scope of valid deflexion angle which increases the depth of cut expands with the increase of the operating pressure. The best deflexion angle is larger when the traverse speed increases and smaller when the stand off distance increases.