High-stability die steel surface combined dual-treatment technology

Abstract

The invention discloses a high-stability die steel surface combined dual-treatment technology. A workpiece is quenched in a salt bath furnace, the temperature of a salt bath is close to the martensite transformation starting point, the workpiece stays at the temperature for 2min to 5min, then the workpiece is taken out to be subjected to air cooling, the purpose of grading air cooling is to enable the temperature of the interior and the exterior of the workpiece to be relatively uniform, martensite transformation is carried out at the same time, the quenching stress can be greatly reduced, and deformation and cracking are prevented. The invention relates to the high-stability die steel surface combined dual-treatment technology, grading quenching and secondary tempering are conducted on steel with the proper temperature and time control, and therefore the steel can be good in toughness and high in strength; and meanwhile, a nitriding layer and a hard film are tightly combined and generated on the surface of a workpiece by adopting a manner of the cooperation of co-permeation oxidation and ionization deposition, compared with single ionization deposition and co-permeation processing, better combination and protection effects can be achieved, the stress distribution continuity of the film layer and the nitriding layer is good, the bearing capacity of the steel to a hard film is improved, and the hard film is prevented from falling off due to the stress.

Description

technical field [0001] The invention relates to the field of workpiece surface treatment, in particular to a high-stability mold steel surface composite double treatment process. Background technique [0002] Molds, various molds and tools used in industrial production for injection molding, blow molding, extrusion, die-casting or forging forming, smelting, stamping, etc. to obtain the required products, in short, molds are tools used to make shaped objects , this kind of tool is composed of various parts, and different molds are composed of different parts. During the use of the mold, under the environment of high temperature, high corrosion and high friction, the nature of the material of the mold itself directly affects the service life and production quality. Therefore, it is necessary to optimize and improve the mold. [0003] The strength of the existing mold itself is mostly obtained through heat treatment, such as quenching and tempering process, but the quenching a...

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Problems solved by technology

[0003] The strength of the existing mold itself is mostly obtained through heat treatment, such as quenching and tempering process, but the quenching and tempering process alone cannot individually improve the vulnerable parts such as the surface, resulting in early damage to the vulnerable parts during use, making the mold unusable , so it is necessary to upgrade and strengthen the mold internally and externally to meet the current use requirements