Preparation method of forging mold by using composite build-up welding and spray welding method

Abstract

The invention initially provides a preparation method of a forging mold by using a composite build-up welding and spray welding method, combined with the characteristics of the build-up welding and the spray welding, and aiming at the status quo of the traditional forging mold manufacturing technology in China at present. The method comprises the following steps of: a. forging a forging mold substrate and carrying out thermal refining, wherein an allowance is reserved at a substrate cavity; b. build-up welding uniformly distributed build-up welding transition layers on a specific cavity surface by using an automatic gas shield build-up welding technique; c. forming a surface reinforcement layer on the surface of the transition layer by using a one-step spray welding method; d. finishing the spray welding and carrying out the remelting and warming at once by using a tempering and slow cooling technique; and e. fine finishing, and putting the size of each part of the cavity in place. Compared with the traditional preparation method of the forging molds, the production cost is reduced, the condemnation factor of a product is decreased, meanwhile, the joint strength of the mold substrate and a welding layer is enhanced, the strength and the impact toughness of the mold are improved, the wear-resisting and the thermal fatigue resistance properties of a surface layer are optimized, and the property of the mold surpasses that of the new-made integral molds of 5CrNiMo and 5CrMnMo.

Description

technical field [0001] The invention relates to the field of molds, in particular to a method for preparing a forging mold. Background technique [0002] In the manufacturing industry, molds are the basic process equipment for industrial production. The level of mold production technology largely determines product quality, efficiency and new product development capabilities, and has become an important symbol to measure the level of a country's product manufacturing. [0003] At present, my country's forging industry mainly uses 5CrNiMo, 5CrMnMo, H13, etc. as die steels. These steel types have certain hardenability, high temperature strength and impact toughness, but generally have a low service life. At the same time, the preparation methods of forging dies in my country are basically made by heat treatment after forging. The forging dies made by this method have poor performance and relatively low service life, which is only equivalent to 1 / 3 to 1 / 5 of foreign countries....

AI Technical Summary

Problems solved by technology

[0003] At present, my country's forging industry mainly uses 5CrNiMo, 5CrMnMo, H13, etc. as die steels. These steel types have certain hardenability, high temperature strength and impact toughness, but generally have a low service life.

At the same time, the preparation methods of forging dies in my country are basically made by heat treatment after forging. The forging dies made by this method have poor performance and relatively low service life, which is only equivalent to 1 / 3 to 1 / 5 of foreign countries.

Most of the failed molds are scrapped only because the thin layer of the working layer on the surface is worn or partially thermally corroded and peeled off, resulting in a huge waste of resources

According to statistics, the steel consumption and energy waste caused by the low life of the mold, as well as the loss caused by the impact on product quality, amount to tens of billions of yuan every year.

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