| 摘要: |
| 航天器薄壁密封舱体属于典型的弱刚性特征结构，加工中材料大量的连续去除易使焊缝区域产生变
形，导致壁厚超差。在舱体内壁合理施加支撑力可有效提高加工精度。因此，本文虑及焊缝区域壁厚的时变特
性，提出了一种基于支撑力自感知的装夹调控方法。首先，通过数值仿真模拟分析了不同支撑力对工件加工变
形的影响规律，以1/8区域为子工步获得了最小加工变形的最优夹紧力。然后，以不同工步所需支撑力作为输
入，通过力感知实时反馈实现闭环控制，开发了支撑力自感知的装夹调控算法。最后，开展了密封舱体焊缝区
域加工试验，结果表明，本文方法能够有效控制加工变形，满足剩余壁厚精度需求。 |
| 关键词: 大型薄壁密封舱体 加工变形 装夹调控 支撑力自感知 |
| 基金项目:国家重点研发计划（2022Y****04700） |
|
| Array Clamping Analysis and Control Method for Large Thin-walled Capsule Weld Region Machining |
|
Liu Haibo1, Zhao Jiulong1, Fang Rui1, Yang Kai2, Lai Xiaoming2, Zhang Bin2, Zhang Yuliang2, Li Xinxin2, Wang Yongqing1
|
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1. State Key Laboratory of High-performance Precision Manufacturing, School of Mechanical Engineering, Dalian
University of Technology, Dalian 116024;2. Beijing Spacecrafts Manufacturing Factory, Beijing 100094
|
| Abstract: |
| The thin-walled sealing compartment of spacecraft is a typical structure with weak rigidity
characteristics. During processing, the continuous removal of a large amount of material can easily cause deformation in
the weld zone, leading to wall thickness deviation. Applying appropriate supporting forces to the inner wall of the
compartment can effectively improve machining accuracy. Therefore, this paper considers the time-varying
characteristics of the weld zone wall thickness and proposes a clamping control method based on supporting force self sensing. First, numerical simulations were conducted to analyze the relationship between different supporting forces and
machining deformation. The optimal clamping force that minimizes machining deformation was determined for each
sub-step based on an 1/8th region of the compartment. Then, the supporting forces required for different processing
steps were input into a feedback system, enabling closed-loop control and a supporting force self-sensing clamping
control algorithm was developed. Finally, machining tests were carried out on the weld zone of the thin-walled sealing
compartment, and the results demonstrated that the proposed method effectively controls machining deformation,
meeting the required residual wall thickness accuracy. |
| Key words: large thin-walled sealed capsule machining deformation clamping control supporting force self sensing |
