Method for repairing pyramidal shaft of cold rolling coiler mandrel

Abstract

The invention discloses a method for repairing a pyramidal shaft of a cold rolling coiler mandrel. The method includes the following steps that the pyramidal shaft is detected on a platform, and repairable parts are selected out; parts to be repaired are detected, and bead weld thicknesses of copper layers of oblique platform surfaces are determined; machining thicknesses of the copper layers are determined according to detection results and all the oblique platform surfaces are machined on a machine tool according to the determined machining thicknesses of the copper layers; bead welding is carried out on the oblique platform surfaces according to the determined bead weld thicknesses of the copper layers; overall aging heat treatment is conducted on the pyramidal shaft; the heating speed ranges from 150 DEG C / h to 450 EDG C or so, heat preservation is conducted for four hours, and the pyramidal shaft is then cooled to be at about 200 DEG C along with a furnace and discharged out of the furnace; deformation detection and correction are carried out on the pyramidal shaft; the oblique platform surfaces of the pyramidal shaft are machined according to design dimensions; sector plates are used for match lapping of the oblique platform surfaces of the pyramidal shaft and are marked with pairing marks; the pyramidal shaft is coped, cleared, oiled and packaged for standby application. The cold rolling coiler mandrel is repaired by adopting the method, performance of the pyramidal shaft of the mandrel can be recovered to the maximum extent through an optimized process route, a reasonable heat treatment system and a precise detection and correction technology, and running cost of equipment can be effectively reduced.

Description

technical field [0001] The invention relates to the technical field of metallurgical steel rolling equipment, in particular to a repair method for a reel pyramid shaft of a cold rolling coiler. Background technique [0002] Most of the large-scale rolling mill coilers adopt the structural form of the quadrangular pyramid shaft reel. This kind of reel has a large bearing capacity and is suitable for large tension coiling. Since the main parts such as the reel sector plate, pyramid shaft, hollow shaft and rotary oil cylinder are all adopted High-strength alloy structural steel forgings are processed, so the manufacturing cost of the reel is relatively high, especially the material of the reel pyramid shaft is precious, the structure is complex, and the precision requirements are high. The manufacturing cost alone is as high as more than 600,000 yuan. Therefore, the repair and reuse of pyramid shafts has become an important way to reduce equipment operating costs. At prese...

AI Technical Summary

Problems solved by technology

At present, due to the unrepairable pyramid shaft of cold rolling manufacturers, the phenomenon of reel abandonment is very serious, and the repair is limited to the reprocessing of the journal after surfacing

This repair method damages the strength of the main material of the pyramid shaft, the balance performance is poor, the accuracy is not high, and the reuse rate is low

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