Heat treatment technology for reducing deformation of spiral bevel gear for hay mower

A bevel gear and lawn mower technology, applied in heat treatment furnaces, heat treatment equipment, manufacturing tools, etc., can solve the problems of inability to guarantee consistent product performance and low yield, and achieve reduced deformation, reduced temperature difference, and good cleaning efficiency. Effect

Active Publication Date: 2016-10-26
常州新区河海热处理工程有限公司
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Problems solved by technology

This application uses isothermal normalizing to have a more uniform structure and performance, which reduces quenching distortion to a certain extent; however, this application only changes ordinary normalizing preheating to isothermal normalizing in the heat treatment process, which simplifies However, it cannot guarantee the consistent performance of the product after one heat treatment, and there is still the problem of low yield

Method used

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  • Heat treatment technology for reducing deformation of spiral bevel gear for hay mower
  • Heat treatment technology for reducing deformation of spiral bevel gear for hay mower
  • Heat treatment technology for reducing deformation of spiral bevel gear for hay mower

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Embodiment

[0040] Taking the heat treatment process of a spiral bevel gear for a lawn mower with a modulus of 1.25 and a number of teeth of 13 as an example, the technical requirements for heat treatment are: surface hardness 600-700HV, effective hardened layer depth 0.2-0.4mm, tooth bar beating ≤ 0.015mm (runout of ribs before heat treatment ≤ 0.008mm), deformation of inner hole ≤ 0.015mm (deformation of inner hole before heat treatment ≤ 0.006mm). In order to meet the above heat treatment requirements, a heat treatment process for reducing the deformation of the spiral bevel gear for lawn mowers in this embodiment specifically includes the following steps:

[0041] (1) Parts preparation: The spiral bevel gear for lawn mowers is prepared by using the alloy steel billet of SCM415. deformation and cracking, while reducing the hardness of the material and improving the machinability of the billet; in this embodiment, the chemical composition of the SCM415 alloy steel billet is (JIS G4085-2...

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Abstract

The invention discloses a heat treatment technology for reducing deformation of a spiral bevel gear for a hay mower and belongs to the field of heat treatment technology. The technology comprises the following steps: 1) preparation of the spiral bevel gear by the adoption of a SCM415 blank; 2) crating; 3) front cleaning; 4) carburizing and quenching: temperature equilibrium at 850 + / - 5 DEG C for 20 + / - 1 min, and carbon potential is 0.65 + / - 0.025%; intensive carburizing and thermal insulation at 880 + / - 5 DEG C for 15 + / - 1 min, and carbon potential is 0.8 + / - 0.025%; diffusion and thermal insulation at 880 + / - 50 DEG C for 15 + / - 1 min, and carbon potential is 0.8 + / - 0.025%; quenching and temperature equilibrium at 840 + / - 5 DEG C for 20 + / - 1 min, and carbon potential is 0.65 + / - 0.025%; and cooling in 130 + / - 10 DEG C of quenching oil; 5) post cleaning; and 6) tempering at the temperature of 175 + / - 5 DEG C for 150 + / - 10 min. According to the invention, deformation of the spiral bevel gear after heat treatment is reduced, and first pass yield for heat treatment can reach 100%.

Description

technical field [0001] The invention relates to a heat treatment process, in particular to a heat treatment process for reducing deformation of a spiral bevel gear used in a lawnmower. Background technique [0002] figure 1 It is a structural schematic diagram of a spiral bevel gear, which is widely used in the gearbox of the lawn mower and is an important part of the reducer system of the lawn mower. During the working process of the lawn mower, the working conditions of the spiral bevel gear are very complicated, and it is required to have excellent wear resistance, high resistance to contact fatigue and bending fatigue resistance, and these properties need to be achieved through heat treatment. At present, for the heat treatment of this kind of spiral bevel gear, the conventional heat treatment process is to use the mesh belt furnace production line carburizing, quenching and tempering. The spiral bevel gear treated by this method has a large amount of deformation and a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/32
CPCC21D9/32
Inventor 殷和平殷敏洁
Owner 常州新区河海热处理工程有限公司
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