High performance cutting pick and manufacturing method thereof

Abstract

The invention provides a high performance cutting pick and a manufacturing method thereof, the high performance cutting pick comprises a tooth tip and a tooth body. The tooth body is high-strength, high-toughness and high-wear-resistance steel. The chemical components are as following by weight percent, 0.30 to 0.40 of C, 2.30 to 2.50 of Si, 2.20 to 2. 60 of Mn, 0.80 to 1.50 of Cr, 0.35 to 0.45 ofMo, 0.01 to 0.1 of Re, 0.02 to 0.04 of Nb, less than 0.01 of S, less than 0.01 of P, and the rest of Fe. After raw materials are refined and cast to obtain steel ingots or subjected to continuous casting to obtain continuous casting billets, after being rolled into round steel, cutting and annealing are conducted, and finally a cutting pick body is obtained by cold forging. The tooth tip is prepared from cemented carbide and welded to the tooth body by medium frequency induction heating. After cooling, austempering treatment is conducted, and finally discharging and air-cooling to room temperature are conducted. The finally obtained tooth body has tensile strength sigma b of 1700 to 2000MPa, yield strength sigma s of 1100 to 1520MPa, elongation delta of 16 to 35%, section shrinkage phi of45 to 55%, impact work Aku of 55 to 90 J, hardness HRC of 53 to 62, and strong plastic product of 32 to 51 GPa.%. The microstructure of the tooth body is a nano-carbide-free bainite-martensitic multiphase organization, and the thickness of a substructure slat is 10 to 50 nm.

Description

technical field [0001] The invention relates to the field of manufacturing parts for coal mining, in particular to a high-performance pick and a manufacturing method thereof. Background technique [0002] The pick is the key component of the fully mechanized mining unit in the coal industry that directly cuts coal and rock. The pick directly cuts coal and rock, not only to break coal and soft rock, but also to excavate in medium-hard semi-coal rock, so the wear is serious . The form of pick failure is that the tip of the carbide tip falls off after the head of the pick body is worn, the tip of the tooth is broken, and the tooth body is bent or broken. Among them, the failure of the tip of the pick body due to the wear of the head of the pick body accounts for about 85% of all failure forms . The reason for the shedding is that in the existing mining picks, the hard alloy tooth tip is embedded in the concave hole of the alloy steel pick body head, and is fixedly connected b...

AI Technical Summary

Problems solved by technology

And with the improvement of the mechanization degree of coal mining machines, the cutting power of coal mining machines and roadheaders continues to increase, which brings about an increase in the consumption of matching mining picks

Images