EFFECTS OF SCANNING METHODS ON THERMAL STRESS DURING LASER METAL DEPOSITION SHAPING

LONG Risheng^1,2  LIU Weijun¹  BIAN Hongyou¹  XING Fei^1,2

(1. Shenyang Institute of Automation, Chinese Academy Sciences, Shenyang 110016;
2. Graduate School, Chinese Academy of Sciences, Beijing 100039)

Abstract: In order to improve the quality of samples and decrease the stress during process, it is of great importance to study the dynamic distribution regularities of thermal stress during laser metal deposition shaping (LMDS) process. According to the “element life and death” technique of finite element method (FEM), detailed three-dimensional multi-track and multi-layer numerical simulations for LMDS are conducted by using ANSYS parametric design language (APDL). In those simulations, the effects of long edge, short edge and direction orthogonal changing in different layers reciprocating scanning to thermal stress during whole metal cladding process are studied, the dynamic distributions of Von Mises, x-directional, y-directional and z-directional thermal stresses under different scanning way are researched, the generation and distribution regularities of thermal stress are also discussed. Using the same process parameters, the simulation results show good agreement with the features of samples which fabricated by LMDS.

Key words: Laser metal deposition shaping  Scanning methods  Thermal stress Numerical simulation

CLC No: TN249 TF124 TG111.3

国家高技术研究发展计划资助项目(863计划, 2002AA420060). Received 20070320, received in revised form 20070717