超高强度合金钢铣削中切削力特征的非线性析因研究

Factorial Study on Nonlinear Characteristics of Ultra High Strength Alloy Steel in High-Speed Cutting Process

应用析因试验设计与均匀试验设计方法,对超高强度合金钢(硬度大于50HRc、抗拉强度σb>1.4GPa)进行了高速铣削试验.在分析其切削非线性特征力的基础上,应用高斯-牛顿迭代法,建立了高速切削力与侧吃刀量、背吃刀量、每齿进给量和切削速度间的非线性数学模型.试验结果表明,高速干式铣削超高强度合金钢时,ap,ae,fz,ap与fz之间,ae与fz之间以及ae与ap之间的交互作用等对切削力有显著影响;切削力与切削用量间存在非线性特征规律,切削用量对切削力的影响具有明显的尺度效应,该效应随切削用量的变化而改变.

Factorials design and uniform design are applied in the high-speed end-milling experiments of ultra high strengthalloy steel (hardness>50 HRc, tensile strength σ_b>1.4 GPa). Characteristics of this difficult-to-cut material in high-speed cutting process are analyzed and a nonlinear model on the relationship between the cutting force and cutting regimes is proposed. Experiments indicate that under the conditions of high-speed cutting of ultra high strength alloy steels, the interaction between depth of cut and feed per tooth, the interaction between width of cut and depth of cut, and the interaction between width of cut and feed per tooth are among the statistically significant effects on the cutting force. Relationships between cutting forces and cutting regimes are nonlinear, scale effect of the cutting parameters is significant; effect of a cutting parameter on the cutting force is sensitive to the choice of other cutting parameters.