摘要
针对大型冷作模具传统热处理存在的变形等问题,采用响应面法研究激光局部热处理工艺参数(激光功率、扫描速度和离焦量)对硬化层形貌(宽度、深度与面积)及效率的作用规律。试验以三因素五水平中心复合设计为基础,通过多元回归和方差分析,构建工艺参数输入与硬化层形貌、硬化效率响应的关系模型。由模型的相关系数可知,硬化层形貌及效率的响应面模型拟合精度高,预测能力强。根据宽度极大、深度极小和面积极大的目标,优化得到最佳工艺参数下的硬化层形貌响应值,较试验实际值的误差分别为1.98%、4.40%和1.58%,进一步验证了模型的准确性。
Owing to the distortion of large cold working dies during traditional heat treatment,the effect of laser local heat treatment parameters(laser power,scanning speed and defocus depth)on the morphology(width,depth and area)and efficiency of hardened layer were investigated by response surface method.Based on the central composite design of three factors and five levels,the relationship model between process parameters input,hardening layer morphology and hardening efficiency response was constructed by multiple regression and variance analysis.From the correlation coefficient of the model,it can be seen that the response surface model of hardened layer morphology and efficiency has high fitting accuracy and strong prediction ability.According to the objective of maximizing width,minimizing depth and maximizing area,the process parameters are optimized.Finally,the relative errors between predicted and actual values of the layer width,depth and area are 1.98%,4.40%and 1.58%,respectively,which further verifies the accuracy of three response surface models.
作者
王乾廷
曾宪斌
陈昌荣
练国富
林远镇
Wang Qianting;Zeng Xian bin;Chen Changrong;Lian Guofu;Lin Yuanzhen(College of Materials Science and Engineering,Fujian University of Technology,Fuzhou Fujian 350118 ,China;School of Mechanical and Automotive Engineering,Fujian University of Technology,Fuzhou Fujian 350118,China)
出处
《金属热处理》
CAS
CSCD
北大核心
2019年第6期193-200,共8页
Heat Treatment of Metals
基金
国家工信部绿色制造系统集成项目(2016-755-63)
国家自然科学基金(51575110)
福建省中青年教师教育科研项目(JAT170376)
关键词
CR12模具钢
激光热处理
响应面法
硬化层形貌
硬化效率
模型
Cr12 die steel
laser heat treatment
response surface method
hardened layer morphology
hardening productivity
model
