Research on deformation mechanism and law of thin-walled flat parts in vacuum clamping

Autor: Dongxing Du, Jinxing Kong, Yunhua Li
Rok vydání: 2021
Předmět:
Zdroj: The International Journal of Advanced Manufacturing Technology. 118:2981-2992
ISSN: 1433-3015
0268-3768
DOI: 10.1007/s00170-021-08091-2
Popis: Based on the theory of small deflection bending of a thin-walled part, a mechanical model of thin-walled planar members under the action of vacuum adsorption was established. Combined with finite-element simulation and testing, the deformation mechanism and law of the thin-walled flat members was studied under the action of vacuum adsorption. Vacuum clamping caused clamping residual stresses on the upper and lower surfaces of the thin-walled flat parts and resulted in torque along the middle surface. When the vacuum clamping was unloaded, the rebound of the thin-walled flat parts that was caused by the torque was the fundamental cause for the clamping deformation. The residual stress and deformation on the surface of the thin-walled flat parts tended to increase and level off with an increase in vacuum. From the initial stage to the stable clamping stage, the radial and tangential stresses in the 200 mm × 2.2 mm workpiece increased by –10 MPa and –27 MPa, respectively, and the relative displacement in the load direction increased by 0.026 mm. Under the effect of vacuum clamping, the maximum deformation capacity of thin-walled flat parts was affected mainly by their initial surface profile error. The stiffness of the workpiece was affected mainly by its thickness; a greater thickness led to a greater stiffness, and a larger vacuum was required for the workpiece to reach a stable clamping state.
Databáze: OpenAIRE
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