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<p>Insufficient clamping stability causes machining deformation of thin-walled parts, leading to detachment of the workpiece from the fixture contact surface. Enhancing the stability of the workpiece-fixture system is necessary. The traditional clamping methods cannot simultaneously reduce concave and bulging deformations, the study proposes a dual-constraint method of internal support-adsorption clamping. Considering the clamping deformation and machining deformation, the clamping stability model is established and deformation constraint indexes are proposed to evaluate the stability of the workpiece-fixture system. A contact area model of the ball end milling cutter and the spherical shell structure is established, and the static response is analyzed based on the finite element method. Finally, the proposed method is validated through experiments. Results demonstrate that the internal support-adsorption clamping method is more effective in reducing both clamping and machining deformations than either internal support clamping or vacuum adsorption clamping alone. Furthermore, the distributed internal support-vacuum adsorption clamping approach exhibits multiple high-deformation zones, whereas the integrated internal support-vacuum adsorption clamping method yields a more uniform deformation distribution with a smaller overall magnitude. With increasing clamping force and the number of clamping components, the clamping deformation increases, whereas the deformation constraint index decreases. Experimental results demonstrate that the average workpiece deformations are 0.22&#xa0;mm, 0.24&#xa0;mm, and 0.17&#xa0;mm for the internal support, vacuum adsorption, and integrated internal support-vacuum adsorption clamping methods, respectively. The integrated method reduces deformation by 22.94% and 26.01%, respectively. This study establishes a novel strategy for clamping thin-walled components.</p>

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Internal support-vacuum absorption composite clamping method for enhancing deformation suppression

  • 期刊论文

  • 发表日期：

    2026年1月20日

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  • Rui Fang,
  • Haibo Liu,
  • Yuhang Cui,
  • Xingliang Chai,
  • Tianran Liu,
  • Yongqing Wang

摘要

Insufficient clamping stability causes machining deformation of thin-walled parts, leading to detachment of the workpiece from the fixture contact surface. Enhancing the stability of the workpiece-fixture system is necessary. The traditional clamping methods cannot simultaneously reduce concave and bulging deformations, the study proposes a dual-constraint method of internal support-adsorption clamping. Considering the clamping deformation and machining deformation, the clamping stability model is established and deformation constraint indexes are proposed to evaluate the stability of the workpiece-fixture system. A contact area model of the ball end milling cutter and the spherical shell structure is established, and the static response is analyzed based on the finite element method. Finally, the proposed method is validated through experiments. Results demonstrate that the internal support-adsorption clamping method is more effective in reducing both clamping and machining deformations than either internal support clamping or vacuum adsorption clamping alone. Furthermore, the distributed internal support-vacuum adsorption clamping approach exhibits multiple high-deformation zones, whereas the integrated internal support-vacuum adsorption clamping method yields a more uniform deformation distribution with a smaller overall magnitude. With increasing clamping force and the number of clamping components, the clamping deformation increases, whereas the deformation constraint index decreases. Experimental results demonstrate that the average workpiece deformations are 0.22 mm, 0.24 mm, and 0.17 mm for the internal support, vacuum adsorption, and integrated internal support-vacuum adsorption clamping methods, respectively. The integrated method reduces deformation by 22.94% and 26.01%, respectively. This study establishes a novel strategy for clamping thin-walled components.