Metal heat treatment deformation cooling calibration synchronization method

Abstract

The invention discloses a metal heat treatment deformation cooling calibration synchronization method which comprises three stages of heating, heat preservation and cooling, wherein in the cooling stage, a metal workpiece after heating and heat preservation is soaked in a cooling medium; and when the metal workpiece does not reach the martensite conversion temperature, the metal workpiece is cooled and calibrated at the same time until the metal workpiece reaches the martensite temperature and is completely cooled, wherein the cooling medium is oil at 60-80 DEG C or gas at normal temperature. By adopting the method disclosed by the invention to perform deformation calibration on the metal workpiece, the problem of difficult calibration caused by high hardness and strength of the metal workpiece after quenching can be effectively reduced, and the calibration steps for the deformation generated after heat treatment of the metal workpiece are simplified.

Description

technical field [0001] The invention relates to a method for correcting metal heat treatment deformation, in particular to a method for synchronous correction of metal heat treatment deformation and cooling. Background technique [0002] Due to the rapid cooling of metal parts during the quenching process, internal stress will be generated inside the part. When the internal stress is large enough, the workpiece will be distorted and deformed. Therefore, the deformation needs to be corrected before the next step of the part. At present, the commonly used correction methods include mechanical correction and heat treatment correction. Mechanical correction is to use mechanical methods to cause local micro-deformation of deformed parts, and at the same time release residual internal stress to achieve the purpose of correcting deformation. Heat treatment correction generally uses appropriate heat treatment methods again. Correct for thermal distortion. However, the above two cor...

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Problems solved by technology

However, the above two correction methods are all carried out after the workpiece is quenched and cooled, and the correction should be carried out according to the specific deformation of the metal after quenching. Since the strength and hardness of the metal parts after quenching are significantly improved, the difficulty of correction is greatly increased and it is time-consuming and labor-intensive. Moreover, after correction, new deformation may appear or have a certain impact on the performance of metal parts