Influence of SLS Forming Parameters on Strength and Dimension Accuracy of PA2200 Tensile Specimens

Author of the article:HOU Gaoyan 1 , HAO Zhiqiang 2 , DUAN Xianyin 2

Author's Workplace：1. School of Electrical and Mechanical Engineering, Wuhan Polytechnic College, Wuhan 430081, China; 2. Key Laboratory of Metallurgical Equipment and Control Technology, Wuhan University of Science and Technology, Ministry of Education, Wuhan 430081, China

Key Words： selective laser sintering; laser power; scanning speed; tensile strength; dimensional accuracy

Abstract：The forming parameters of selective laser sintering (SLS) have great influence on the mechanical properties and
dimensional accuracy of forming parts, and different forming materials need different process parameters combination.
However, there is no standard of forming parameters for PA materials. In order to solve this problem, the influence of laser
power and scanning rate on tensile strength and size of forming parts was studied by using PA2200 powder material. The
results show that the optimal parameters are as follows: laser power 40 W, scanning rate 4 000 mm/s, taking tensile
strength and dimensional accuracy as reference indexes, combined with theoretical analysis and experimental verification.
With this parameter, the tensile strength of PA2200 can reach 44.48 MPa, and the relative deviations of dimension accuracy
in X, Y and Z directions are -0.41%, -0.40% and 0.50%, respectively.