基于力学分析的铍材车削切削力模型研究

Research on Cutting Force Model of Beryllium Turning Based on Mechanical Analysis

铍材作为一种典型难加工材料,其加工方式主要为车削,但铍材较硬较脆,经常会出现局部断裂以及锐边崩边的缺陷;切削力作为影响刀具磨损以及加工质量的重要因素,预测车削铍材的切削力对选取切削参数具有十分重要的意义。本文基于力学分析的半经验预测公式建立了一种基于热力耦合的铍材车削切削力预测模型,并进行了试验验证。结果发现,模型预测值与试验值数值拟合良好,整体误差为10.79%,误差范围为2.96%~20.53%。研究分析了不同切削参数下刀具磨损以及表面粗糙度的变化机理,为铍材车削加工提供一定的理论参考。

As a typical difficult-to-machine material,beryllium material is mainly processed by turning,but beryllium material is harder and more brittle,which often has local fractures and sharp edge chipping defects;Cutting force is an important factor that affects tool wear and processing quality,predicting the cutting force of turning beryllium materials is of great significance to the selection of cutting parameters.Based on the semi-empirical prediction formula of mechanical analysis,this paper establishes a thermal-mechanical coupling-based cutting force prediction model for beryllium turning,and conducted experimental verification.The result shows that the predicted value of the model fits well with the experimental value,and the overall error is 10.79%,the error range is 2.96%–20.53%.The change mechanism of tool wear and surface roughness under different cutting parameters is analyzed,which provides a certain theoretical reference for beryllium turning processing.