基于温度分区的激光沉积成形扫描路径生成方法

doi:10.3901/JME.2015.24.057

机械工程学报 ›› 2015, Vol. 51 ›› Issue (24): 57-62.doi: 10.3901/JME.2015.24.057

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基于温度分区的激光沉积成形扫描路径生成方法

卞宏友¹, 范钦春¹, 李英², 杨光¹, 钦兰云¹, 王维¹

1. 沈阳航空航天大学航空制造工艺数字化国防重点学科实验室沈阳 110136；
2. 中航工业沈阳黎明航空发动机(集团)有限责任公司焊接研究所沈阳 110043

收稿日期:2014-12-29 修回日期:2015-06-29 出版日期:2015-12-15 发布日期:2015-12-15
作者简介:卞宏友，男，1975年出生，博士，副教授。主要研究方向为金属激光沉积成形/修复技术。 E-mail：bianhongyou@sau.edu.cn
基金资助:
国家自然科学基金(51375316)、辽宁省自然科学基金(201202173)、航空科学基金(2014ZE54028)和辽宁省高等学校科学研究(L2014054)资助项目。

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

BIAN Hongyou¹, FAN Qinchun¹, LI Ying², YANG Guang¹, QIN Lanyun¹, WANG Wei ¹

1. Key Laboratory of Fundamental Science for National Defence of Aeronautical Digital Manufacturing Process, Shenyang Aerospace University, Shenyang 110136;
2．Welding Institute, AVIC Shenyang Liming Aero-Engine (Group) Corporation Ltd., Shenyang 110043

Received:2014-12-29 Revised:2015-06-29 Online:2015-12-15 Published:2015-12-15

摘要/Abstract

摘要： 现有金属激光沉积成形工件是根据几何模型按照设定扫描路径层层叠加而成，不可避免造成局部热量累积，导致成形工件内部温度梯度大，产生局部应力集中，易引起工件变形开裂。对成形过程温度进行实时检测并实现动态扫描路径规划是解决工件变形开裂的根本途径。在研究不同基体温度对熔宽、熔高影响规律基础上，提出基于层面温度分区的激光沉积成形扫描路径生成方法。采用红外热像仪对沉积层面温度进行实时采集，提取不同温度分区轮廓；提出温度分区轮廓规则化方法，消除局部轮廓尖角，避免过熔覆；改进Weiler-Atherton算法，快速实现分层轮廓与温度分区轮廓的求交运算；针对不同温度分区采用适应性间距生成扫描路径，实现激光沉积成形动态扫描路径规划。试验结果表明：该扫描路径可有效提高成形工件质量。

关键词: 层面温度实时采集, 分区轮廓规则化, 分区扫描路径, 激光沉积成形, 温度分区轮廓提取

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

卞宏友, 范钦春, 李英, 杨光, 钦兰云, 王维. 基于温度分区的激光沉积成形扫描路径生成方法[J]. 机械工程学报, 2015, 51(24): 57-62.

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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基于温度分区的激光沉积成形扫描路径生成方法

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

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