High wear-resistant roller screen roll and build-up welding process

Abstract

The invention discloses a high wear-resistant roller screen roll and a build-up welding process, and manufactures a roller screen roll with high surface hardness and high composite strength. The technical proposal is as follows: the screen roll utilizes an ordinary carbon steel tube as a substrate, the build-up welding layer on the surface of the substrate utilizes a composite material with gradually increased hardness, and the first layer of the build-up welding layer is a transitional layer and utilizes Austenitic stainless steel of which the hardness is higher than that of the ordinary carbon steel and the welding strength is high; and the second layer and the third layer are wear-resistant layers, namely work layers and are welded by special 00Cr13 serial wear-resistant welding wire, with high hardness and high wear resistance. The build-up welding process of the screen roll is as follows: lathe machining on the substrate before welding; preheating temperature; transition layer build-up welding; temperature detection; wear-resistant layer build-up welding; tortuosity checking; rough turning; surface flaw inspection; finish turning, grinding; product finishing. The invention adopts the build-up welding process to carry out local optimization, the hardness is increased from inner to surface in a gradient manner; the build-up layer and the substrate are metallurgical combined, and the combining strength is high without crack and falling off; the surface of the roll has strong wear resistance and toughness; the service life is improved by 2 to 3 times; and the cost is low.

Description

technical field [0001] The invention belongs to the field of a rolling screen for sinter pellets and a manufacturing method, and in particular relates to a high wear-resistant rolling screen roll and a surfacing welding process. Background technique [0002] In the production of sinter, the pellets produced by the pelletizing disc need to be sieved by rolling screen rollers before entering the next process. The quality and service life of the sieve roller directly affect the quality and output of the pellets. According to the material, there are two main types of sieve rollers currently used, one is made of stainless steel 1Cr18Ni9Ti as a whole, and the other is made of composite materials on the surface, usually wear-resistant rubber, ceramics or polyurethane. The stainless steel screen roll made of 1Cr18Ni9Ti has good corrosion resistance, smooth surface and no sticky material, but low hardness, poor wear resistance and high cost; composite screen roll made of wear-resist...

AI Technical Summary

Problems solved by technology

The stainless steel screen roll made of 1Cr18Ni9Ti has good corrosion resistance, smooth surface and no sticky material, but low hardness, poor wear resistance and high cost; composite screen roll made of wear-resistant rubber, ceramics or polyurethane and other wear-resistant materials , lower cost, better wear resistance, but the wear-resistant rubber or polyurethane composite layer has low bonding strength with the substrate, and it is easy to fall off during use; while ceramics are brittle materials, which are easily crushed by hard objects mixed in the pellets , these all affect the quality and use of the screen roll

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