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Gear blank isothermal annealing process and isothermal annealing production line

A technology of isothermal annealing and process curve, which is applied to the improvement of process efficiency, manufacturing tools, furnace types, etc., to achieve the effects of reducing heat loss, prolonging the service life of the furnace, and saving energy.

Inactive Publication Date: 2010-11-17
天津市天瑞硬化工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The overall heating process of the gear blank in the prior art is not conducive to accurately and stably obtaining the metallographic structure with superior cutting performance for the ring gear

Method used

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  • Gear blank isothermal annealing process and isothermal annealing production line
  • Gear blank isothermal annealing process and isothermal annealing production line
  • Gear blank isothermal annealing process and isothermal annealing production line

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Embodiment Construction

[0016] The following is attached Figure 4 with attached Figure 6 The specific implementation of the present invention is described in detail.

[0017] attached Figure 4 It is a schematic diagram of the forging preheating isothermal annealing process curve of the present invention. According to this process requirement, after the gear blank is released from the die forging hammer, the blank can be sent into the Figure 6 In the mesh belt type soaking furnace, the soaking temperature is selected according to the TTT curve of the forging billet steel type. After equalizing, the blank will automatically fall to the working area of ​​the intermediate frequency heating furnace. At this time, the blank is loaded into the intermediate frequency sensor by manual or automatic loading machine Inside, the intermediate frequency heating program is started, and the heating is stopped after heating to the predetermined austenitizing temperature. The gear blank is sent into the mesh belt...

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Abstract

The invention relates to a heating treatment process for scale production of gear blanks and a corresponding heating treatment production line. The invention eliminates the integral recrystallization heating of the gear blanks, and gears can stably obtain a metallographic structure with excellent cutting performance and an expected hardness value no matter using a forging waste heat isothermal annealing process or an isothermal annealing process conducted after the blank is cooled of the invention.

Description

technical field [0001] The gear blank isothermal annealing process and isothermal annealing production line involved in the present invention belong to the field of heat treatment process and heat treatment equipment. Background technique [0002] In the existing technology, there are three main types of heat treatment for mass-produced gear blanks, i.e. normalizing ( figure 1 ), normalizing + tempering ( figure 2 ) and isothermal normalizing ( image 3 ), in the above process, the workpiece is heated as a whole to Ac 3 Point above, then cool in different ways. The heat treatment of the gear blank is also called pre-heat treatment. Its function is to eliminate the forging stress, refine the structure and obtain the appropriate hardness, so as to facilitate machining. Since the wheel auxiliary and inner hole of the gear are generally processed by turning and broaching, this machining method does not have high requirements on the metallographic structure, while the ring g...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/32C21D1/26C21D1/42
CPCY02P10/25
Inventor 张元增
Owner 天津市天瑞硬化工程有限公司
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