Heat treatment method and special tooling for lawn mower sprocket

A heat treatment method and lawn mower technology, applied in the field of heat treatment, can solve the problems of uneven surface hardness, difficult and flat wave deformation, cracks in the sprocket teeth, etc., and achieve the effects of large deformation, stress relief, and good hardenability.
CN104818377BActive Publication Date: 2017-07-21厦门真冈热处理有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
厦门真冈热处理有限公司
Publication Date
2017-07-21

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Abstract

The invention discloses a method for heat treatment of lawnmower sprockets and special tooling, which performs batch heat treatment of sprockets through the special tooling, and the special tooling includes a mounting chassis and a mounting seat arrayed on the mounting chassis, the mounting seat There is a positioning rod on the outer edge, and a flow hole is provided in the middle of the mounting seat. The sprocket is stacked on the mounting seat. The outer tooth groove of the sprocket corresponds to the position of the positioning rod of the mounting seat. The inner hole corresponds to the position of the flow hole of the mounting seat, and the charging step, preheating step, heating step, quenching step, and tempering step are carried out in sequence during the heat treatment process, and each is set according to the charging method of the special tooling. The temperature parameters and time parameters of the steps are used to achieve a better heat treatment effect, which not only improves the production efficiency through batch processing, but also can control the deformation of the heat treatment and improve the hardness accuracy of the sprocket.
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Description

technical field

[0001] The invention relates to the technical field of heat treatment, in particular to a method for heat treatment of a lawnmower sprocket and special tooling for heat treatment of the method. Background technique

[0002] The sprocket is a common part in the gearbox. In the gearbox of the lawnmower, the national standard (GB14212) stipulates that the axial runout of the sprocket should not be greater than 0.3mm. In the heat treatment production, the deformation of the sprocket needs to be controlled. and hardness.

[0003] In the traditional sprocket tooth heat treatment process, the induction heat treatment of the sprocket tooth (45 carbon steel) is to use the rotating sprocket as a whole to immerse in quenching oil, that is, after the sprocket is heated to the quenching temperature by induction, it is directly immersed in quenching oil in the rotating state Medium cooling and quenching, tempering after taking it out, but the use of this process usually l...

Claims

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