Subtractive Post-machining Allowance Optimization Considering Characteristics of DEDs

被引：0
|
作者：
Hou L. [1 ]
Guo J. [1 ]
Chen Y. [1 ]
Ye C. [1 ]
Xu Y. [1 ]
Zou J. [1 ]
机构：
[1] Department of Mechanical and Electric Engineering, Xiamen University, Fujian, Xiamen
来源：
Zhongguo Jixie Gongcheng/China Mechanical Engineering | 2022年 / 33卷 / 17期
关键词：
allowance optimization; directed energy deposition（DED）; dynamic registration; on-machine measurement; stair-case effect;
D O I：
10.3969/j.issn.1004-132X.2022.17.011
中图分类号：
学科分类号：
摘要：
Complex free-form parts manufactured by DED had problems of uneven allowance distributions and severe stair-case effects. In order to optimize allowances for subtractive post-machining, a dynamic point cloud registration method using the mid-surface points of the deposited and theoretical parts was proposed to optimize the machining allowances， which took into consideration characteristics of the DED parts. Firstly， the section line of the minimum outer envelope of deposited complex free-form parts was constructed according to the deposition scanning path, and was used for obtaining the point cloud of the on-machine measurement. Secondly， the mid-surface points of the deposited and theoretical parts were extracted, and an iterative closest point with dynamic weights considering the multi-region allowance requirements was proposed to optimize the machining allowances. The feasibility of the algorithm was verified by two simple cases. Finally, a free-form blade of a centrifugal impeller was selected as a complex case for allowance optimization. The proposed method was also compared with the method for multi-region allowance using genetic algorithm. The results show that the proposed allowance optimization method is more accurate and efficient for rapid optimization of machining allowances for DED manufactured complex curved parts. © 2022 China Mechanical Engineering Magazine Office. All rights reserved.
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页码：2098 / 2106
页数：8
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