摘要金属切削过程中刀具前刀面与切屑底层发生强烈的挤压摩擦，同时伴有高温、高应变、高应变速率，所以刀屑接触区的摩擦状态非常复杂，一直是切削加工中的热点与难点问题。本论文基于Deform-2D有限元模拟软件模拟了难加工材料钛合金的切削过程，得到了带状切屑，并对Deform软件自带材料库中的钛合金 Johnson-Cook 本构模型进行完善，更准确的得出应力与应变、温度、应变速率的关系，使模拟结果更加接近真实情况，使刀屑接触区的摩擦状态分析更具有准确性。本文模拟并分析了不同切削速度、切削深度、刀具刃圆半径、刀具前角、刀具涂层对切削力、切削温度的影响。模拟了不同切削条件下刀屑接触摩擦状态参数（应力、温度)的分布情况,分析不同切削条件对刀屑接触区的粘结-滑移分离点的影响。49806

毕业论文关键词： 刀-屑接触区摩擦状态；粘结-滑移分离点；接触区状态参数；有限元模拟；

Abstract Metal Cutting tool rake face and chip friction underlying strong compression occurs, accompanied by high temperature, high strain, high strain rate, so the knife friction state chip contact zone has been very complex machining in the hot and difficult issues the thesis is based on Deform-2D finite element simulation software to simulate the difficult materials titanium cutting process, the chip has been banded, and Deform software comes with titanium material library Johnson-Cook constitutive model is perfect, draw more accurate stress and strain, temperature and strain rate relationship, so that the simulation results closer to the real situation, the knife chip contact zone friction state analysis is more accurate. This simulate and analyze the different cutting speed, cutting depth, the tool edge radius, tool rake angle, the cutting force tool coating, the cutting temperature. Different cutting conditions simulated knife chip contact friction state parameters (stress, temperature) distribution, analysis of different cutting conditions on the knife chip contact zone bond - slip separation point of impact.

Keywords  Tool-chip friction state; Sticking-sliding separated point; Contact

state parameters; Finite element simulation; 

目录

第一章 绪论 - 1 -

1.1 刀-屑接触区摩擦状态概述 - 1 -

1.1.1 刀-屑接触区摩擦状态及特点 - 1 -

1.1.2 刀-屑接触区摩擦状态对切削加工过程的影响 - 2 -

1.2 刀-屑接触区摩擦状态的国内外研究概况及意义 - 2 -

1.2.1 国外研究概况 - 2 -

1.2.2 国内研究概况 - 3 -

1.2.3 存在的问题及研究意义 - 3 -

第二章 钛合金材料 - 5 -

2.1 概述 - 5 -

2.2的化学成分及物理力学性能 - 6 -

2.3.1 Ti6Al4V的化学成分 - 6 -

2.3.2 Ti6Al4V的物理性能 - 7 -

2.3.3 Ti6Al4V的力学性能 - 8 -

2.3 钛合金Ti6Al4V的Johnson-Cook 本构模型 - 8 -

2.3.1 Johnson-Cook 本构模型概述 - 8 -

2.3.2 在J-C本构模型下的应变、应变率和应力 - 9 -

第三章 金属切削过程有限元建模 - 20 -

3.1 有限元法简介