A processing method for anti-shedding and high wear-resistant picks

Abstract

The invention discloses a processing method of anti-disengagement high-wear-resistance cutting teeth. The processing method mainly comprises the following steps of preparing a soldering flux, wherein the soldering flux comprises the following raw materials in percentage by mass: 8 percent of borax, 20 percent of boric acid and the balance of pure copper powder; coating the soldering flux on the outer surface of a processed cylindrical soldering lug, and then putting the cylindrical soldering lug into a groove of a cutter bit; coating the soldering flux at the bottom and on the outer circle surface of a hard alloy cutter bit, and then putting the hard alloy cutter bit into the cylindrical soldering lug; preheating the cylindrical soldering lug in an incubator with the temperature of 200 DEG C, heating the cylindrical soldering lug in an oven with the temperature of 930 DEG C, and then slowly cooling the cylindrical soldering lug to room temperature; removing the welding flux and oxide skin remaining on the surfaces of the cutting teeth, feeding metal base ceramic alloy powder to the positions, except the hard alloy cutter bit and a cutter handle, on the cutter bit; performing laser scanning; finally performing stress relief annealing on the laser-clad cutting teeth, maintaining the temperature of 200-400 DEG C for 2-4 hours, and then slowly cooling to the room temperature along with a furnace. According to the method, the hard alloy cutter bit is firmer, and the synchronous failure of the cutter handle and the hard alloy cutter bit can be realized. Compared with single laser-clad strengthened cutting teeth, the anti-disengagement high-wear-resistance cutting teeth have the advantage that the service lives can be prolonged by over 3 times.

Description

technical field [0001] The invention belongs to the technical field of mechanical processing, in particular to a method for processing picks in coal mining equipment. technical background [0002] During the working process of the shearer, the pick on the shearer drum directly cuts coal, which is its key part. The hard alloy cutter head of the pick is fixed on the handle by brazing, and the brazing strength directly affects the service life of the pick. The working condition of the pick is harsh and the stress is complicated, which leads to serious shedding of the carbide cutter head. The performance of the pick and the production cost directly affect the production efficiency of the shearer. [0003] The traditional fixing method of the hard alloy cutter head is embedded in the handle, and then fixed by edge brazing. In actual use, it often happens that the hard alloy cutter head falls off due to brazing and welding, resulting in early failure of the pick. In recent year...

AI Technical Summary

Problems solved by technology

In actual use, the service life of the pick strengthened by laser cladding is twice that of the ordinary pick. The final form of damage is not the wear and tear of the cladding layer of the shank, but the shedding of the carbide tip