Scan Path Generating Method Based on Temperature Subarea of Laser Deposition Shaping

doi:10.3901/JME.2015.24.057

Abstract

Abstract: Any workpiece is shaped by layer upon layer according to the planned scan path from its CAD model in the current laser deposition shaping (LDS), it is inevitably cause the local heat accumulation, there are usually both great temperature gradient and stress concentration in the workpiece, which is the essential reason of workpiece deformation and cracking. The dynamic scan path planning based on the LDS layer temperature real-time collection is a fundamental way to solve this problem. The influence of substrate temperature on the width and high of single-pass cladding is revealed, a new kind of scan path generating method is presented based on temperature subarea of shaped layer. The shaping layer temperature is real-time collected by infrared thermal imager, and the temperature subarea contour is extracted. The regular method of temperature subarea contour is presented, to eliminate local sharp of subarea contour corners and avoid over-cladding. A revised Weiler-Atherton algorithm is put forward to quickly realize boolean operations of intersection between temperature subarea contours and slice contours of CAD model. A generating scan path by adaptive scan space for different subarea based on subarea temperature is come up with, the dynamic scan path planning of LDS is realized. Practical application shows which the scan path effectively enhance the shaped workpiece quality.

Key words: laser deposition shaping, layer temperature real-time collection, subarea contour regular, subarea scan path, temperature subarea contour extraction

BIAN Hongyou, FAN Qinchun, LI Ying, YANG Guang, QIN Lanyun, WANG Wei . Scan Path Generating Method Based on Temperature Subarea of Laser Deposition Shaping[J]. Journal of Mechanical Engineering, 2015, 51(24): 57-62.

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