激光技术2018，Vol.42Issue(1)：136-140,5.DOI:10.7510/jgjs.issn.1001-3806.2018.01.027
汽车发动机连杆激光3-D打印工艺研究
Study on laser 3-D printing process of automotive engine connecting rods
摘要
Abstract
In order to study the manufacturing process of laser 3-D printing for automobile engine connecting rods,by means of theoretical analysis and experimental verification,3-D model of a connecting rod was established and slicing was done.By S-type scanning and contour offset scanning,two machining paths of connecting rods were planned.Alloy powders based on iron and the corresponding technological parameters were selected to carry out the rod print test in a laser 3-D printing system.It took 4min30s ～4min56s to scanning a single layer and it took 4h20min totally.The results show that the metallographic structure at the bottom of the forming zone of the connecting rod is mainly columnar crystal and dendritic crystal.The middle and upper part are small equiaxed crystal.Interlayer is dense and good metallurgical bonding had been formed.The microhardness of the formed connecting rod is 450HV ～ 490HV,yield strength is 754MPa,tensile strength is 1189MPa,and elongation rate was 9％.Compared to forging,powder forging manufacturing processes,laser 3-D printing forming reduces tooling costs and shortens the production preparation time.Its mechanical properties,such as yield strength and tensile strength,exceed those of steel forging links.Compared with foreign powder forged connecting rod,the difference is not very big.The process can meet the requirements of connecting rod blank making.关键词
激光技术/发动机连杆/3-D打印/工艺研究/试验Key words
laser technique/engine connecting rod/3-D printing/process study/experiment分类
矿业与冶金引用本文复制引用
雷凯云,秦训鹏,徐昀,刘华明,胡泽启..汽车发动机连杆激光3-D打印工艺研究[J].激光技术,2018,42(1):136-140,5.基金项目
国家自然科学基金资助项目(51575415) （51575415）
