Method for levelling metal plate with stress deformation by utilizing vacuum annealing

Abstract

The invention discloses a method for levelling metal plate with stress deformation by utilizing vacuum annealing. The metal plate required to be levelled is placed in a fixture comprising an upper cover plate and a lower cover plate, a sealed air pocket is arranged on the metal plate, the elastic thin wall of the air pocket is contacted with the metal plate, the air pocket is fastened onto the metal plate required to be levelled, and the metal plate is placed into a vacuum annealing furnace, vacuumizing, heating and annealing are carried out, and levelling on the metal plate is carried out after annealing is finished. The method of the invention changes the levelling method from local deformation into global deformation while the metal plate is in uniform stress after yield stress is reduced, thus finishing levelling in one step and improving efficiency and accuracy of levelling; and meanwhile the method of the invention combines 'levelling' and 'annealing' processes, thus shortening production period and reducing production cost.

Description

technical field [0001] The invention relates to a processing technology for metal materials, in particular to a method for annealing and leveling stress-deformed metal plates. Background technique [0002] Stress-deformed metal sheets, such as rolled metal sheets, have problems of deformation and uneven plane due to residual stress inside the metal; moreover, there is the possibility of continuous deformation during subsequent machining. Therefore, metal sheets with stress deformation need two processes of "levelling" and "annealing" (sometimes, a second "levelling" and "levelling" should be done during the machining process), the purpose is to When machining metal sheets, the deformation of the metal material can be controlled to meet the machining accuracy requirements. More importantly, the treated metal sheet will be in a relatively stable state in terms of residual stress and organizational structure, and the equipment or parts made of the metal sheet will not change s...

AI Technical Summary

Problems solved by technology

Different from the current multi-roller leveling method (use the point and line mechanical contact between the metal plate and the roll to produce plastic deformation, and then achieve the purpose of leveling by the elastic recovery of the metal plate), the method of the present invention can overcome the correction problems existing in the existing method. Leveling is carried out locally, so it is often impossible to complete this inherent defect at one time, and the resulting leveling effect is limited, and the leveling accuracy is not high.

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