Pre-cold pressing quenching correction technology for die steel

Abstract

The invention discloses a pre-cold pressing quenching correction technology for a die steel. The technology, which quits the manner of the traditional thermal treatment process that the die steel needs to be insulated for a while after heating, comprises the steps of pre-cooling the die steel part after being heated to Ac1+(50-80)DEG C of the material, and carrying out pressing quenching cooling correction on the die steel directly without heat preservation. According to the technology, the plasticity and toughness of an austenite material are fully utilized, the quenching stress of the die steel being thermally treated is lowered to the minimum, the die steel deforms slightest, and then the die steel workpiece is simple and easy to correct.

Description

technical field [0001] The invention relates to a metal quenching correction process, in particular to a pre-cooling press quenching correction process for die steel. Background technique [0002] Due to the rapid cooling of the metal workpiece during the quenching process, internal stress will be generated inside the workpiece. When the internal stress is large enough to a certain extent, the workpiece will be distorted and deformed. Therefore, the deformation must be corrected before the next step of the workpiece. 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 workpieces, 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 to correct the deformation. Its thermal deformation is corrected. H...

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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 workpiece after quenching are significantly improved, the difficulty of correction is greatly increased and it is time-consuming and labor-intensive. New deformations may appear after corrections or have a certain impact on the performance of metal workpieces

The above situation is especially serious for thin plates or strip workpieces with a thickness of less than 20mm

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