镐型截齿激光熔覆数值模拟研究  

Numerical Simulation Study on Laser Cladding of Pick-Shaped Cutter

作　　者：陈向阳[1] 郑小豪 魏昌国 方志淮 李兵 CHEN Xiangyang;ZHENG Xiaohao;WEI Changguo;FANG Zhihuai;LI Bing(School of Mechanical Engineering,Anhui University of Science and Technology,Huainan 232001,China;Anhui Jiuhuan Intelligent Environmental Protection Technology Co.Ltd.,Huainan 232001,China;Anhui Shengming New Material Technology Co.Ltd.,Huainan 232001,China)

机构地区：[1]安徽理工大学机械工程学院,安徽淮南232001 [2]安徽九环智能环保科技有限公司,安徽淮南232001 [3]安徽晟名新材料科技有限公司,安徽淮南232001

出　　处：《河南科技》2023年第23期38-42,共5页Henan Science and Technology

基　　金：安徽省高校自然科学基金重点项目(KJ2019A0127)。

摘　　要：【目的】通过激光熔覆可改善截齿齿头部位工作性能,提高其工作寿命,熔覆参数是否合适对截齿性能有直接影响,因此,有必要对镐型截齿激光熔覆数值开展模拟研究。【方法】对截齿激光熔覆过程中的温度场进行研究,并研究了激光功率和扫描速率对温度场和应力场的影响。在An⁃sys workbench平台中,运用APDL编程及单元生死技术,得到截齿不同扫描速率和激光功率的温度场和应力场。【结果】激光功率越高,峰值温度越大,冷却速率会降低。提升激光功率会增加熔覆时和冷却后的残余热应力。扫描速度越大,峰值温度越低,提升扫描速度会降低熔覆时和冷却后的残余应力。同时,提升扫描速率和激光功率,可提升熔覆效率,熔覆时和冷却后的残余应力整体会降低。【结论】在提高熔覆效率的同时,要考虑对性能的影响,需要综合改变整体工艺参数,同时在熔覆后需进行适当热处理,能进一步降低残余应力。[Purposes]At present,tooth picking improves the working performance of its tooth head through laser cladding,prolongs its working life,and whether the cladding parameters are suitable has a direct impact on the tooth picking,thus,it is necessary to carry out numerical simulation study on laser cladding of pick-shaped catter.[Methods]The temperature field in the process of laser cladding of picks was studied,and the effects of laser power and scanning rate on the temperature field and stress field were studied,too.In the Ansys workbench platform,using APDL programming and element birth and death technology,the temperature field and stress field of the cutting tooth at different scanning rates and laser power are obtained.[Findings]The results show that the higher the laser power,the greater the peak temperature,and the lower the cooling rate.Mincreasing the laser power increases the residual thermal stress during cladding and after cooling.The higher the scanning speed,the lower the peak temperature,and increasing the scanning speed will reduce the residual stress during cladding and after cooling.Meantime,increasing the scanning rate and laser power can improve the cladding efficiency,and the residual stress during cladding and after cooling will be reduced overall.[Conclusions]While improving the cladding efficiency,the impact on performance should be considered,and the overall process parameters need to be comprehensively changed,and appropriate heat treatment is required after cladding to further reduce the residual stress.

关 键 词：有限元 激光熔覆 温度场 残余应力 

分 类 号：TG144[一般工业技术—材料科学与工程]