Manufacturing method of alloy steel for high and cold zone motor shaft

Abstract

The invention discloses a manufacturing method of alloy steel for a high and cold zone motor shaft. The alloy steel is made of 42CrMo; the method comprises smelting and forging of a roller blank, tempering and quenching treatment and annealing treatment; the temperature of the tempering and quenching treatment is 790-810 DEG C and the time is 20-30 hours; a cooling medium adopted after the tempering and quenching treatment is polyvinylpyrrolidone aqueous solution; the temperature of the annealing treatment is 610-630 DEG C, and the time is 15-25 hours. Special heat treatment is performed on the conventional 42CrMo material, the tempering and quenching temperature is reduced, and the polyvinylpyrrolidone aqueous solution is used as the cooling medium, so that the motor shaft with larger specification which can meet the requirements that the temperature is 20 DEG C below zero and the impact force is greater than or equal to 27 J close to the surface and at the 1 / 2 radius part can be prepared; compared with the prior art, the method has the advantages that the production cost is reduced and the process is simple and is suitable for industrial large-scale production by adding a micro-alloyed element of higher price.

Description

technical field [0001] The invention relates to a method for manufacturing alloy steel for shafts, in particular to a method for manufacturing alloy steel for motor shafts in alpine regions. Background technique [0002] The motor shaft is one of the most critical parts of the generator. The load it bears during use is relatively complex and the working environment is relatively harsh. Especially for some generators used in alpine regions (plateau and cold regions), the motor shaft is required to have Better low temperature impact toughness (impact energy ≥ 27J at -20°C) to avoid low temperature brittle fracture. [0003] At present, the materials for manufacturing such motor shafts are mainly 34CrNiMo6 and 42CrMo. [0004] 34CrNiMo6 has high strength, good toughness and good hardenability, and its low-temperature impact toughness is good, which can meet the requirements of various specifications of motor shafts. However, the content of Ni in 34CrNiMo6 is relatively high, ...

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Problems solved by technology

[0008] The purpose of the present invention is to solve the problem that the conventional 42CrMo in the prior art cannot meet the requirement of -20°C impact energy ≥ 27J at the 1 / 2 radius of the motor shaft with a larger specification, and the improved 42CrMo has high production cost, complicated process, and is not suitable for large-scale industrialization. To solve technical problems such as large-scale production, provide a method for manufacturing alloy steel for motor shafts in alpine regions with low production cost, simple process, and suitable for industrialized large-scale production

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