On-line repair method of fixed slanted wedge positioning groove in rolling mill stand archway

Abstract

The invention discloses an on-line repair method for a fixed wedge positioning groove in a rolling mill stand arch. The method firstly produces a positioning tool and a left and right side plate for fixing the inclined wedge positioning groove. On the outer sides of the two side plates of the positioning tool; measure and record the installation position dimensions of the left and right plates of the original positioning slot, use a carbon planer to remove the left and right plates of the original positioning slot; The plate and the right plate are set at the position of the original fixed wedge positioning groove, and the installation positions of the left plate and the right plate are checked; the outer welds of the left plate and the right plate are welded by gas shielded welding, and the positioning tooling is removed after Weld the inner welding seam; after welding, grind the welding seam, color the surface for flaw detection, measure the actual opening size of the left plate and the right plate, conform to the width of the positioning groove, and complete the repair. The method effectively improves the repairing efficiency and the repairing effect, reduces the repairing cost, prolongs the service life of the positioning groove after repairing, and ensures the shearing quality of the thick plate.

Description

technical field [0001] The invention relates to an on-line repair method for a fixed slanted wedge positioning groove in an archway of a rolling mill stand. Background technique [0002] The cut-to-length shears and the cut-to-length shears in the rolling mill stand archway are the key equipment in the finishing process of the thick plate production line. When it is cut to the order specification, the quality of the shear section of the thick plate directly affects the final quality of the steel plate. There are four pairs of fixed wedge positioning grooves on the main reducer body of the fixed-length shears and the cutting head shears. The fixed wedge positioning grooves are composed of left and right plates arranged at intervals. The left and right plates plate structure such as figure 1 As shown, the left side panel 1 and the right side panel 2 are arranged facing each other and the gear 200 is opened , and there are symmetrical keyways 11 and 21 on the left side plat...

AI Technical Summary

Problems solved by technology

After a long period of use, the inner surfaces of the left side plate and the right side plate that constitute the positioning groove are severely worn (up to 5-10mm), and the keyway wears up to 3-5mm, which seriously affects the positioning function of the fixed wedge and reduces the shearing equipment. The positioning gap control of the knife holder directly affects the final quality of the product. In order to ensure the cutting accuracy, the positioning groove of the fixed wedge must be repaired

The method of dismantling the cutting shears and the cut-to-length shears as a whole has high construction costs and a long construction period, which cannot meet the requirements of equipment maintenance and production. Therefore, only online repair methods can be used for repair.

The conventional online repair method is surfacing welding at the worn part, and then machining to restore the size of the positioning groove and keyway. However, due to the space limitation of the positioning groove, the thermal stress generated during the surfacing process makes it risk of cracking, and machining It is difficult for the equipment to process the positioning groove as a whole, so that the processing accuracy of the positioning groove is low. The service life of the positioning groove repaired by this online repair method is short, and the repair effect is not good

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