Process of Quenching Scrap Bearing Steel to Make Die Steel

Abstract

The invention discloses process of utilizing waste bearing steel to manufacture a die steel by quenching, which comprises the following steps: a, sorting 3.6-4.6 kg stub bar tailings; b, forging into a cylindric blank with diameter of 55-65 millimetres and 180-220 millimetres by a pneumatic hammer; c, performing oxygen-free spheroidizing annealing; d, performing metal roughing; e, performing quenching and tempering; and f, performing metal finishing. The process has the advantages of relative low processing cost, very stable quality, and long service life. Moreover, the service life of the die steel can be as long as that of a core roller processed through the die steel 3Cr2W8V; the prepared die steel is low in cost, about 10 percent of a conventional die steel, as the cost of the waste bearing steel is about 50 percent of the 45 steel, and also realizes reutilization of waste materials.

Description

technical field [0001] The invention relates to the technical field of bearing processing, in particular to a process for making die steel from waste bearing steel by quenching. Background technique [0002] Bearing ring forging industry, especially the forging of medium and large bearing rings, such as figure 1 The core rolls shown are the main vulnerable molds. The main cause of damage is oxidation or breakage. When the hardness is low, the oxidation is serious, and the size of the core roll becomes smaller, which affects the product quality. When the hardness is high, it is easy to break and needs to be replaced frequently. There are two kinds of materials and manufacturing processes commonly used in the core roller: one is to use No. 45 steel round bar material, and complete the mold production through cutting and blanking, metal rough machining, quenching and tempering, metal finishing and other processes; its characteristic lies in the processing The cost is relativel...

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Problems solved by technology

[0002] Bearing ring forging industry, especially the forging of medium and large bearing rings, such as figure 1 The core roll shown is the main vulnerable mold, the main cause of damage is oxidation or breakage, when the hardness is low, the oxidation is serious, the size of the core roll becomes smaller, and the product quality is affected, and when the hardness is high, it is easy to break and needs to be replaced frequently

There are two kinds of materials and manufacturing processes commonly used in the core roller: one is to use No. 45 steel round bar material, and complete the mold production through cutting and blanking, metal rough machining, quenching and tempering, metal finishing and other processes; its characteristic lies in the processing The cost is relatively low, the processing cycle is short, but the quality is extremely unstable and the service life is very short

The second is to use the mold steel 3Cr2W8V round bar, and complete the production of the mold through cutting and blanking, metal rough machining, metal finishing and other processes; its characteristics are relatively short processing cycle, stable quality and long service life, but the cost is extremely high

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