焊接快速成形零件的表面平整度研究  

Surface smoothness of metal parts manufactured by welding rapid forming

作　　者：李超[1] 徐龙堂[1] 张明[1] 朱胜[2] 刘燕林[3] 

机构地区：[1]北京特种车辆研究所,北京100072 [2]装甲兵工程学院装备再制造技术国防科技重点实验室,北京100072 [3]中国兵器科学研究院宁波分院,浙江宁波315103

出　　处：《兵器材料科学与工程》2012年第6期8-11,共4页Ordnance Material Science and Engineering

基　　金：国家自然科学基金资助项目(50975286);中国机械工程学会焊接学会创新思路预研奖学金资助项目

摘　　要：焊接快速成形耐磨金属零件的生产过程中,采用逐层铣削-堆积提高成形件的表面平整度非常困难。为此,提出了提高成形件表面平整度的方法以减少铣削加工量。通过三维激光扫描建立成形件表面平整度的评价方法。研究了焊道搭接率、余高和路径规划方式对成形件表面平整度的影响规律。结果表明:采用适当的搭接率,降低焊道余高,按照层层正交的路径成形,可以显著提高成形件的表面平整度;成形件表面平整度的提高与沉积层温度场的大小及分布均匀性有关。In the manufacturing process of wear resistant parts by welding rapid forming technology, it is very difficult to enhance the surface smoothness of parts by milling and depositing layer by layer. Therefore, the method for improving surface smoothness was brought forward to reduce milling allowance. Evaluation method for surface smoothness was firstly created by three- dimensional laser scanning. The effects of overlap ratio, weld bead reinforcement and routing planning mode on surface smoothness were investigated based on the evaluation method. The results indicate that the surface smoothness can be improved by adopting appropriate overlap ratio, reducing reinforcement and depositing with orthogonal routes layer by layer. The improvement of surface smoothness is attributed to the magnitude and distribution of temperature field of formed parts.

关 键 词：焊接快速成形 金属芯焊丝 表面平整度 耐磨零件 

分 类 号：TG444.73[金属学及工艺—焊接]