Reproducing method of forging mold by using composite build-up welding

Abstract

The invention discloses a reproducing method of forging mold by using composite build-up welding and spray welding method. The method comprises the following steps of: a. integrally shaving a cavity part of an ineffective mold until the defect of the cavity is removed; b. spray-welding a uniform spray welding layer on the inner surface of the mold cavity by using a one-step spray welding method; c. build-up welding a surface reinforcement layer on the spray welding surface of a mold transition layer by using an automatic gas shield build-up welding technique; d. finishing the build-up welding, carrying out the remelting and warming at once by using a tempering and slow cooling technique and ensuring that the mold is thoroughly heated during the warming time; and e. fine finishing, and putting the size of each part of the cavity in place. In the invention, the combination of the build-up welding and the spray welding is innovatively provided, compared with the prior art, the productioncost 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 in a reinforcement region surpasses that of the new-made integral molds of 5CrNiMo and 5CrMnMo.

Description

technical field [0001] The invention relates to the field of dies, in particular to a method for repairing and remanufacturing a forging die. 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, in many enterprises in our country, the service life of molds is still relatively low, which is only equivalent to 1 / 3 to 1 / 5 of that in foreign countries. Most of the failed molds are scrapped only because a very thin layer of the working layer on the surface is worn or partially thermally corroded and peeled off, resulting in a great waste of resources. According to statistics, the steel consumption and energy waste caused by the low life of the mold, as well as the lo...

AI Technical Summary

Problems solved by technology

The local welding method has a poor repair effect, and the performance of the mold after repair is difficult to meet the requirements in all aspects, and it will be damaged again soon and needs to be repaired again. The economic benefit is not high; The reduction of quality will accelerate the reduction of mechanical properties, causing the mold to be scrapped in advance, and at the same time, it will cost a lot of machining costs and heat treatment costs

Images