Quenching and tempering method in tooth punching process of gear with medium-hard tooth surface

A processing method and hardened tooth surface technology, applied in the field of gear processing, can solve the problems of uneven tooth root hardness of gear tooth surface, increase carburizing and quenching heat treatment process, and reduce gear service life, so as to reduce pitting and improve rolling Tooth efficiency and the effect of reducing tool loss

Inactive Publication Date: 2012-06-20
NANJING JINXIN TRANSMISSION EQUIP
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Problems solved by technology

[0003] These two methods have their own shortcomings. The first method satisfies the existing hobbing processing capacity at the expense of part of the strength, and the hardness of the finished gear tooth surface is not uniform from the tooth top

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  • Quenching and tempering method in tooth punching process of gear with medium-hard tooth surface
  • Quenching and tempering method in tooth punching process of gear with medium-hard tooth surface

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Embodiment Construction

[0013] The embodiments of the present invention are described in detail below. This embodiment is implemented on the premise of the technical solution of the present invention, and detailed implementation methods and specific operating procedures are provided, but the protection scope of the present invention is not limited to the following implementation example.

[0014] Such as figure 1 As shown, the medium-hardened gear to be processed in this embodiment is 42CrMoA; the modulus is m=14, the number of teeth is z=65, the coefficient of addendum height is ha=1, the spiral direction is to the left, and the pressure angle α=20° , Helix angle β=14°, headspace coefficient C=0.25, radial displacement coefficient X=0.153, center distance a=620mm.

[0015] This embodiment includes the following steps:

[0016] (1) Gear blank processing: After the gear blank is forged and normalized, rough turning and drilling are carried out;

[0017] The specific rough turning and drilling are a...

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Abstract

The invention discloses a quenching and tempering method in tooth punching process of a gear with a medium-hard tooth surface. The method comprises the following steps of: machining of a gear blank: roughly turning and drilling the gear blank after forging and normalizing treatments; rough turning and heat treatment of a tooth shape: roughly hobbing the gear to form the tooth shape; releasing needed grinding amount according to a tooth thickness; then quenching and tempering at medium and high temperature, wherein the heating process of the quenching is under the protection of a carbon potential atmosphere; and carrying out shot blasting after the heat treatment; finish machining of the tooth shape: firstly, finely machining a tooth shape assembling standard of the gear by semi-finish turning and accurate grinding; and then finely machining the tooth shape of the gear by tooth grinding. The gear manufactured by the method disclosed by the invention has the advantages that the hardness of the tooth surface and the tooth root is improved, the hardness of the quenched and tempered tooth surface ranges from about HB340-370, thereby solving the problem that the medium-hard gear hobbing tool with tooth surface hardness higher than HB320 is difficult to machine. As a process of hobbing before the heat treatment is adopted in the method, the hobbing efficiency is greatly improved and the tool loss is reduced.

Description

technical field [0001] The invention relates to a gear processing method, in particular to a processing method for gear opening and tempering of medium hard tooth surface gears. Background technique [0002] Due to the cutting strength of the hob, usually only parts below HB320 can be processed. For some products, especially some imported products, the quenching and tempering hardness often reaches HB350 or even higher. For such parts, two methods are often used: one is to artificially reduce the quenching and tempering hardness of medium-hard gears to below HB320; The first method is to change the gears into hard-toothed gears to improve the strength and precision. [0003] These two methods have their own shortcomings. The first method satisfies the existing hobbing processing capacity at the expense of part of the strength, and the hardness of the finished gear tooth surface is not uniform from the tooth top to the tooth root. It will reduce the service life of the gear...

Claims

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Application Information

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IPC IPC(8): B23P15/14C21D9/32C21D1/25C23C8/22
Inventor 胡文刚杨孟云孙茂青聂启春
Owner NANJING JINXIN TRANSMISSION EQUIP
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