Product Code: PIC2008_1106

Process Parameters Study of Closed-Loop Laser Rapid Forming
Authors:
Jun Yu, State Key Laboratory of Solidification Processing, Northwestern Polytechnical University; Xi\'An Peoples Republic of China
Hua Tan, State Key Laboratory of Solidification Processing, Northwestern Polytechnical University; Xi\\'An Peoples Republic of China
Jing Chen, State Key Laboratory of Solidification Processing, Northwestern Polytechnical University; Xi\\'An Peoples Republic of China
Xin Lin, State Key Laboratory of Solidification Processing, Northwestern Polytechnical University; Xi\'An Peoples Republic of China
Weidong Huang, State Key Laboratory of Solidification Processing, Northwestern Polytechnical University; Xi\'An Peoples Republic of China
Presented at PICALO 2008

To improve the accuracy and response time of closed-loop Laser Rapid Forming (LRF) equipment, influences of processing parameters, including laser power, traverse speed, laser spot diameter, powder feeding rate, shielding gas flow rate and the interactions among them, and the relevant quantitative relationships between deposition layer dimension and significance processing parameters were investigated in this paper. Based on Orthogonal Regression Design (ORD) method and Statistical Product and Service Solutions (SPSS) analysis software, a stepwise linearity regression model was built up to solve the problem. Results of the study indicate that deposition height is mainly affected by mass input of the melt pool, namely, powder feeding rate and traverse velocity, in which powder feeding rate plays a more important role. Deposition width is affected by energy input such as, spot diameter, traverse speed and the interaction between laser power and spot diameter, while spot diameter and traverse speed are of greater influence. Finally, the quantitative relationships were obtained in the model to improve real-time setting accuracy. A real-time monitoring system built identified the dependence of deposition layer dimension on LRF significance processing parameters. The experimental results are in good agreement with the model.