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

A composite welding and remanufacturing technology, used in manufacturing tools, welding equipment, melt spraying, etc., can solve the problems of large machining costs and heat treatment costs, difficulty in mold performance, low economic benefits, etc., and achieve enhanced surface resistance. Abrasion and thermal fatigue resistance, optimized strength and impact toughness, matrix material savings

Active Publication Date: 2010-07-07
CHONGQING JIEPIN TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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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 b

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

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Embodiment Construction

[0032] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0033] The forging die to be repaired in this specific embodiment is the lower die of an ordinary forging die, and the cross-sectional structure to be welded is as follows: figure 1 As shown, its repair method includes the following steps executed in sequence:

[0034] a. The cavity of the forging mold to be repaired is planed down to remove the failure part to form a wavy surface, such as figure 1 shown.

[0035] b. Perform one-step spray welding of self-fluxing alloy powder on the wavy surface of the mold to form a uniformly distributed spray welding layer, which serves as a transition layer.

[0036] c. Adopt automatic gas shielded surfacing welding process, and carry out surface strengthening layer surfacing welding on the spray welding surface of the transition layer of the mold.

[0037] d. The mold adopts tempering and slow ...

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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 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 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...

Claims

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Application Information

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IPC IPC(8): B23P6/00C23C4/06B23K9/04
Inventor 周杰卢顺
Owner CHONGQING JIEPIN TECH
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