Loader integral abrasion proof shovel edge material, heat treatment and welding process

Abstract

The invention is a material of monobloc wearable perching knife blade of a loader, and its characteristic: it is Chinese-made steel 1E921, which contains: C 0.15-0.20, Si 0.15-0.35, Mn 0.95-1.30, P<=0.035, S<=0.040, Cr 0.40-0.65, Mo 0.25-0.35, and B 0.0005-0.0030. Its heat processing technique has the characters: pushing the monobloc knife blade in quenching and heating furnace by a stock pusher in order to heat the whole to 910-950deg.C and preserving a certain period of time, then pushing it in quenching press bed for pressure quenching, and then tempering the whole by using tempering furnace, so as to make the hardness of perching knife blade up to HRC 40-48. Its welding technique has the characters: able to adopt solid core solder wire Co2 welding, drug core solder wire CO2 welding, Ar+Co2 mixed gas shielded welding and manual arc welding, and the welding linear input energy is controlled at 9-20KJ / cm, and welded roots should be strictly cleaned up. It has the characters of high strength, good flexibility, uneasy deformation and rupture, wearability and good weldability.

Description

technical field [0001] The invention belongs to construction machine loaders, and in particular relates to the material, heat treatment and welding process of the integrated wear-resistant shovel blade of the loader. Background technique [0002] The shovel blade is the front edge of the bucket, which is a long plate with a knife edge, such as the ZL50 loader shovel blade, and its size (length×width×thickness) is 2990×300×30mm. Its working conditions are very harsh, and the requirements for steel are more stringent. When working, under the action of strong force, the shovel blade directly shovels into the material (such as ore, sand, coal, etc.) and has strong friction and impact with the material. Therefore, sufficient hardness and toughness are required to resist wear, deformation and fracture. For long plate steel, it is easy to deform after heat treatment, and the deformation is not easy to control. Drawings have very strict requirements on deformation: the total lengt...

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Problems solved by technology

[0003] At present, the shovel blade of the loader used in our country is made of four-piece ordinary cast steel tailor-welded or made of 16Mn and other steel plates. Without heat treatment, it has low strength, poor toughness, easy deformation and fracture, and poor wear resistance.

[0004] Changlin Co., Ltd. adopts intermediate frequency quenching heat treatment process for spatula blade heat treatment, although it can improve the hardness and wear resistance of spatula blade, but due to the characteristics of intermediate frequency quenching, this process can only quench the surface of spatula blade edge. Life expectancy cannot be greatly increased

The cost of the CW-A quenching medium used in quenching is relatively high, and it has certain pollution to the environment

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