非均匀螺旋角铣刀的结构分析和稳定性预测

2019-05-20

作者：张明阳，郭强，冯聪慧单位：河南理工大学

摘要：高速铣削加工中，传统均匀螺旋角刀具不能有效抑制铣削过程中的再生颤振，但非均匀螺旋角铣刀却可以解决此类问题。本文通过分析各个铣削刃螺旋角和容屑角的空间结构关系，并结合“再生因子”探究其与再生颤振之间的关系。确定非均匀螺旋角与容屑角之间的控制方程，并建立铣削动力学模型。通过增强摄动同伦法（EMHPM）计算出非均匀螺旋角铣削加工过程中的稳定性叶瓣图。采用试验验证非均匀螺旋角刀具的有效性，利用本文方法与全变量插值法进行比较（对比试验1）；利用均匀螺旋角刀具模型与非均匀螺旋角刀具模型进行比较（对比试验2）。试验结果表明，本文方法可以准确预测铣削稳定性，非均匀螺旋角可以有效提高铣削稳定性。

关键词：非均匀螺旋角铣刀；再生因子；切削力；增强摄动同伦法（EMHPM）

中图分类号：TG714；TH162文献标志码：ADOI：10.3969/j.issn.1000-7008.2019.05.012

Structural Analysis with Stability Prediction of Nonuniform Helix Angle Tools

Zhang Mingyang，Guo Qiang，Feng Conghui

Abstract:With tools Uniform helix angle can not effectively suppress the chatter of highspeed machining.The spatial structures of the helix angle and pitch angle of each flute are analyzed.And the chatter stability defined by “regeneration factor” is considered.Then the governing equation of the machining system for nonuniform helix angle with pitch angle and the milling dynamics model are established.Based on this model，the Enhanced Multistage Homotopy Perturbation Method (EMHPM) is used to compute the stability lobes.For verifying the feasibility of the stability prediction for the cutter with nonuniform helix angle，the proposed method in this paper is compared with the full variable interpolation method by contrast experiment 1 and by contrast experiment 2，the tool with nonuniform helix angle is compared with the tool of uniform helix angle.The results show that the proposed method is accurate to predict the stability and the tools with nonuniform helix angle indeed increase the stability in milling process.

Keywords:tools with nonuniform helix angle；regeneration factor；cutting force；enhanced multistage homotopy perturbation method（EMHPM）