钛合金超声振动辅助切削锯齿形切屑形成机理的数值分析

陈德雄; 陈金国

doi:10.13433/j.cnki.1003-8728.20200353

钛合金超声振动辅助切削锯齿形切屑形成机理的数值分析

doi: 10.13433/j.cnki.1003-8728.20200353

陈德雄^1,,
陈金国²

1.
莆田学院新工科产业学院, 福建莆田 351100
2.
莆田学院机电工程学院, 福建莆田 351100

基金项目:

莆田学院校级科研项目 2019125

详细信息

作者简介:
陈德雄(1991-), 助教, 硕士, 研究方向为先进制造技术, chendexiong219@163.com

中图分类号: TH16
计量
- 文章访问数: 143
- HTML全文浏览量: 78
- PDF下载量: 15
- 被引次数: 0
出版历程
- 收稿日期: 2020-06-01
- 刊出日期: 2022-02-25

Numerical Analysis of Serrated Chip Formation Mechanism of Titanium Alloy in Ultrasonic Vibration Assisted Machining

CHEN Dexiong^1
,,
CHEN Jinguo²

1.
New Engineering Industry College, Putian University, Putian 351100, Fujian, China
2.
Mechanical and Electrical Engineering College, Putian University, Putian 351100, Fujian, China

摘要

摘要: 超声振动辅助切削(UVAM)作为一种新颖而有效的加工技术，可有效提高工件的切削加工性能，被广泛应用于钛合金切削加工领域。建立热-力耦合模型仿真超声振动切削钛合金Ti6Al4V的瞬态切削过程，研究不同振幅对钛合金锯齿切屑的影响。数值研究结果表明：超声振动与切削速度的耦合作用导致材料出现大塑性变形，且高温是形成锯齿形切屑的主要原因。随着振动振幅的增大，切屑的弯曲半径、锯齿齿距和锯齿化系数均随之增大。本文结论为钛合金超声振动辅助切削的锯齿形切屑形成机理研究提供了参考。
- 钛合金 /
- 超声振动辅助切削 /
- 锯齿切屑 /
- 数值分析
Abstract: As a new and effective machining technology, ultrasonic vibration assisted machining (UVAM) can effectively improve the machining performance of workpieces, which has been widely used in the field of titanium alloy machining. A thermo-mechanical coupled model is established to simulate the transient cutting process of titanium alloy Ti6Al4V in ultrasonic vibration assisted machining. The influence of different vibration amplitudes on the serrated chips of titanium alloy is studied. The simulation results show that the coupling effect of ultrasonic vibration and cutting speed leads to large plastic deformation, and high temperature is the main reason for the formation of serrated chips. The bending radius, serration pitch and serration coefficient of chip all increase with the increase of amplitude. The conclusion can provide a guidance for the research of serrated chips formation mechanism of titanium alloy in ultrasonic vibration assisted machining.
- titanium alloy /
- ultrasonic vibration assisted machining /
- serrated chip /
- numerical analysis

HTML全文

图 1 超声振动切削几何模型

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图 2 不同切削速度的切屑形貌

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图 3 锯齿形切屑形成过程中的温度变化

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图 4 锯齿形切屑形成过程中的等效塑性应变

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图 5 振幅对锯齿切屑弯曲程度的影响

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图 6 锯齿形切屑表征

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图 7 振幅对锯齿化系数G_s的影响

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图 8 振幅对齿距L_s的影响

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图 9 沿锯齿切屑预定路径上各参数的变化

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表 1 Ti6Al4V的物理和热力学性能参数^[14]

参数	数值
线膨胀系数a/(m·(m·℃)^-1)	9.6×10^-6
比热容c/(J·(kg·℃)^-1)	526.3
密度ρ/(kg·m^-3)	4.43×10³
弹性模量E/MPa	1.14×10⁵
泊松比v	0.342
热导率η/(W·(m·℃)^-1)	6.785

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表 2 仿真工艺参数^[17]

参数	取值
切削速度V/(m·min^-1)	40, 80, 120, 160
进给量f/(mm·r^-1)	0.1
工件切削厚度d/mm	2
刀具前角α/(°)	0
刀具后角β/(°)	7
刀尖半径r/μm	25

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参考文献(20)

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