A 4pg 900×700 Four Roll Crusher Roll Skin Surfacing Repair Method

Abstract

The invention discloses a method for roll skin bead weld repair of a 4PG 900*700 four-roll crusher. The method for roll skin bead weld repair of the 4PG 900*700 four-roll crusher comprises the following steps of (1) roll skin of the 4PG 900*700 four-roll crusher is fixed, and turning, completion and polishing processing are carried out on the roll skin of the 4PG 900*700 four-roll crusher; (2) the processed roll skin is placed into an electric heating furnace to be heated, and is cooled after heating, and bead weld is carried out on the roll skin; (3) in the process of bead weld, the overlapping portion between two weld passes is larger than one second of each weld pass; (4) when the thickness of bead weld on a single side reaches 40mm, the roll skin is hoisted into the electric heating furnace to be heated again, is cooled to be at the temperature of 270-300DEG C, and is discharged out of the electric heating furnace, and bead weld is carried out on the roll skin again; (5) when the thickness of the roll skin reaches the working dimension of 905mm through bead weld, the roll skin is placed into the electric heating furnace to be processed in a tempering mode, and the 5mm allowance of the roll skin is removed after tempering. The method for roll skin bead weld repair of the 4PG 900*700 four-roll crusher solves the technical problems that the phenomena that the roll skin can easily crack to be scrap, dense map cracking exists on the surface layer of bead weld, hardness is low, and abrasive resistance is poor easily happen through traditional bead weld technological thermal processing .

Description

technical field [0001] The invention relates to the field of crusher roll skin reuse, in particular, the invention relates to a method for repairing roll skin of a 4PG900×700 four-roll crusher by surfacing welding. Background technique [0002] The four-roller crusher is a secondary and tertiary crusher with simple structure and reliable performance. It is mainly used for crushing medium-hard materials such as limestone, argillaceous shale, brick, slag, clinker, feldspar, and coke. 4PG900×700 four-roller crusher is mainly used to crush coke (particle size less than 3mm), the diameter of the roller skin is 900mm, and the length is 700mm. [0003] The main working principle of the four-roll crusher is that two pairs of crushing rollers rotate relative to each other under the drive of the motor, and the material enters between the two roller skins and is crushed by high extrusion force and friction. The wear of the roll skin of the four-roll crusher is quite serious when crush...

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a method for repairing the roll skin of a 4PG900×700 four-roller crusher by surfacing welding. This method solves the problem that the traditional surfacing process is prone to cracking and scrapping of the roll skin, and the surface layer of the surfacing welding has fine and dense network cracks. Due to technical problems such as low hardness and poor wear resistance, the outer surface of the repaired roller skin is smooth and smooth, with a long service life and a high pass rate of broken materials

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