Laser fusing and coating process of wear resistant and anticorrosion alloy coatings at surface of slide plate of railroad turnout

Abstract

A laser cladding process of an exterior wear-resisting anti-corrosive alloy coating of a slide chair of a railway switch comprises processes as follows: firstly, the surface of the slide chair is pre-heated, which means the surface of the slide chair is degreased and de-rusted under room temperature; and the surface is cleaned up by alcohol; then alloy powder is prefabricated, which means iron-base, nickel-base or cobalt base alloy powders that are ready for cladding are preplaced on the processed surface of the slide chair, and a scraping straightedge provided with a rail is used for adjusting the pretreated metal powder so that the alloy powder can be distributed on the surface of the slide chair evenly and has proper thickness to meet the thick requirement of the coating after cladding; and finally, the slide chair is hardened by the laser cladding; the laser of CO2 gas is adopted; a numerical control machine is used as a working table and the surface of the slide chair is hardened by the laser cladding. The laser cladding process has the characteristics of no pollution, high production rate, low energy consumption, the little finishing allowance of cladding coating and low combined cost.

Description

technical field [0001] The invention belongs to the technical field of laser cladding, and in particular relates to a process for preparing a wear-resistant and anti-corrosion alloy coating on the surface of a sliding bed plate of a railway turnout. Background technique [0002] The turnout is the key equipment to limit the speed of the train, and it plays a special role in the high-speed railway. The sliding bed plate is located on the switch pillow surface within the entire length of the switch rail, and has high requirements for surface wear resistance and corrosion resistance. Since the sliding bed board is exposed to the atmospheric environment, its corrosion resistance is also required. The conventional treatment method is to apply additional oil to the surface of the sliding bed board for rust prevention. In terms of wear resistance of the sliding bed, there are two ways of mechanical anti-friction roller device and strengthening and reducing friction on the surface ...

AI Technical Summary

Problems solved by technology

But if all adopt the roller slide bed board, it will cause the high cost of the whole group of turnouts, and there is no need to get twice the result with half the effort; the surface strengthening and repair methods of the existing turnout slide bed boards include electroplating, brush plating and spraying, although these two surface treatment methods It can improve the wear resistance of the sliding bed plate, but the interface between the coating and the sliding bed plate is not well bonded, and it is also prone to cracks or coating peeling due to local stress concentration, which reduces its strengthening effect to a certain extent