基于星点设计的碟盘刀具截割煤岩性能评价与预测

Performance evaluation and prediction of disc cutter cutting coal and rock based on star point design

为提高碟盘刀具截割煤岩性能,减小碟盘刀具载荷,以进给速度、切削厚度、振动频率设计了3因素5水平15组星点设计数值模拟,构建了数值模拟载荷回归模型,采用响应面法绘制等高线图确定了因素取值范围,根据熵值法分配权重后计算15组数值模拟综合评价值Wi,对比分析了碟盘刀具振动切削实验结果与回归模型预测值,验证回归模型的准确性。结果表明,通过星点设计与响应面法给出了进给速度、切削厚度、振动频率对碟盘刀具性能的影响范围。数值模拟结果与回归模型预测值平均偏差为1.98%,实验载荷谱径向载荷峰值均值与回归模型预测值平均偏差为14.19%。

This paper intends to improve the cutting performance of disc cutter,reduce the load on disc cutter,and designs 15 groups of star point design numerical simulation with 3 factors and 5 levels based on feed speed,cutting thickness and vibration frequency.The study involves,developing the load regression model based on the results of numerical simulation,and drawing the contour map to determine the value range of the factors uisng the response surface method;distributing the weight and calculating the comprehensive evaluation value Wi of 15 groups of numerical simulation using the entropy method;and verifing the accuracy of the regression model by comparing and analyzing the experimental results of vibration cutting with the predicted values of the regression model.The results show that the influence range of feed rate,cutting thickness and vibration frequency on the disc cutter performance is given by central composite design and response surface method;there is an the average deviation 1.98%between the numerical simulation results and the predicted value of regression model and the average deviation 14.19%between the peak value of radial load of experimental load spectrum and the predicted value of regression model.