A Repairing Method for Worn Support Window on Bending Block of Rolling Mill

Abstract

The invention relates to a method for repairing wear of a support window on a roll bending block of a rolling mill. The main purpose is to remove part of the quenching layer and mill the quenched and tempered layer of the support window, to expand and deepen the wear-intensive window to the surrounding unilaterally, and to mill the threaded hole in the support window for the special key block for bolt connection. ; Dimensional and functional recovery is to configure the bolt sleeve in the enlarged threaded hole, and then process a threaded hole consistent with the original size in the inner hole of the bolt sleeve, so as to realize the recovery of the size and function of the internal threaded hole of the support window. This application can fully restore the support window of the bending block. Since the depth of the keyway between the special key block and the support window has been increased, the special key block can be fixed more effectively. When the lower guide is impacted, the special key block is impacted and loosened. Got stronger.

Description

technical field [0001] The invention relates to a method for repairing mechanical wear, in particular to a method for repairing wear of a support window on a roll bending block of a rolling mill. Background technique [0002] There are 4 sets of bending blocks installed in the archway window of the reversible rolling mill for rolling steel plates, and each set of bending blocks is composed of 4 hydraulic piston rods and 1 combined cylinder. The hydraulic piston rod on the roll bending block acts on both sides of the upper and lower work roll chocks of the rolling mill. figure 1 . When the steel plate is rolled, the roll bending force is applied to the bearing housing of the work roll, so that the work roll produces a small amount of unevenness, so as to achieve the purpose of controlling the shape of the steel plate. [0003] Due to the limited space of the rolling mill, the fixing of the front and rear lower guides of the rolling mill needs to be realized by means of spec...

AI Technical Summary

Problems solved by technology

When the hot billet is reciprocatingly rolled, it will continuously hit the lower guide. After long-term use, the special key block used to fix the lower guide will become loose and the connecting bolts will break, which will cause the size of the support window of the bending block to wear and tear. The thread of the bolt hole is pulled off, and in severe cases, the special key block cannot be fixed and cannot support the weight of the lower guide

[0004] The bending block of the enterprise is an important part, which is expensive. If the support window cannot be used, it will cost too much to scrap the loss

[0005] The material used for the bending block is 42CrMo4. The heat treatment is quenching and tempering plus surface quenching. If the conventional welding process is used for repair, the material will be welded and heated to generate internal stress, which will cause the block of the bending block to crack, and then the oil cylinder in the bending block will leak and be scrapped. as a result of

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