高速铣削Mg-Al-Zn-Mn系镁合金时切削力影响因素析因偏回归研究

Factorial and Partial Regression Study about Influence Factors on Cutting Force of Magnesium Alloy in High Speed Milling Process

在切削速度 4 71.2 4～ 94 2 .4 8m/min ,每齿进给量 0 .0 5～ 0 .2mm ,背吃刀量 2～ 4mm范围内 ,研究了高速端面铣削Mg -Al-Zn -Mn系镁合金过程中主切削力的变化规律 ,并从切削变形机理上进行了讨论与分析。通过L8(2 3)析因分析与偏回归分析 ,考察切削用量对铣削力的影响规律 ,使用残差分析与最小二乘法等统计方法 ,建立了主切削力与切削用量的经验公式。研究结果表明 :高速铣削时 ,背吃刀量和每齿进给量是对主切削力有显著影响的效应因素 ;在试验速度范围内 ,随切削速度的增大 ,主切削力将成下降趋势 ;在选定的切削用量范围内 ,实际测量切削力与由经验公式计算结果较为吻合。

With cutting velocity (range from 471.24～942.48 m/min),feed per tooth (range from 0.05～0.2 mm) and depth of cut (range from 2～4 mm),the characteristics of primary cutting forces in high speed dry machining of magnesium alloy are studied,and the high speed cutting deformation mechanism is also discussed in this paper. Through three-factor factorial design and partial regression,the influences of cutting regimes on milling force are observed. The empirical formula of cutting force is established by statistic analysis tools as residual analysis and least square algorithm. It is concluded that depth of cut and feed per tooth are the main influence factors on primary cutting forces;the main cutting force will begin to decrease with the increase of cutting velocity;in specified cutting regimes,the calculation results from the empirical formula are in good agreement with the experimental results.