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Drive gear and preparation method thereof

A driving gear and tooth profile technology, which is applied in the field of driving gear and its preparation, can solve the problems of short life, low gear hardness and impact toughness, etc., to improve strength, increase hardenability, increase corrosion resistance and oxidation resistance. Effect

Active Publication Date: 2014-12-10
南京航迅机电有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, most gears are made of QT500 ductile iron. The average service life of a gear is only about 15 days. The hardness and impact toughness of the gear are low, and the service life is short, which cannot meet the needs of industrial applications.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A driving gear provided in this embodiment, the chemical composition of the driving gear is: C: 0.20%, Si: 0.35%, Mn: 0.50%, Cr: 1.6%, Ni: 3.4%, Nb: 0.04%, V: 0.03%, Cu: 0.4%, P: 0.03%, S: 0.025%, lanthanide rare earth: 0.03%, the balance is Fe;

[0036] The chemical composition of the lanthanide rare earth components by weight percentage is: La: 20%, Sc: 12%, Y: 16%, Sm: 21%; Gd: 20%, and other lanthanide elements: 11%.

[0037] The preparation method of above-mentioned drive gear, specifically carries out according to the following steps:

[0038] (1) The driving gear mold is made of molding sand and core sand as molding materials. Before making the mold, the molding sand in the molding material is first placed in an oven for drying;

[0039] (2) Heat and melt the chemical composition of the driving gear at 1650°C, inject it into the mold formed in step (1), and release it after air cooling to obtain the driving gear blank;

[0040] (3) For the drive gear blank in ste...

Embodiment 2

[0048] A drive gear provided in this embodiment, the chemical composition of the drive gear is: C: 0.23%, Si: 0.33%, Mn: 0.55%, Cr: 1.5%, Ni: 3.2%, Nb: 0.03%, V: 0.01%, Cu: 0.2%, P: 0.025%, S: 0.018%, lanthanide rare earth: 0.01%, the balance is Fe;

[0049] The chemical composition of the lanthanide rare earth components by weight percentage is: La: 23%, Sc: 11%, Y: 15%, Sm: 20%; Gd: 19%, and other lanthanide elements: 12%.

[0050] The preparation method of above-mentioned drive gear, specifically carries out according to the following steps:

[0051] (1) The driving gear mold is made of molding sand and core sand as molding materials. Before making the mold, the molding sand in the molding material is first placed in an oven for drying;

[0052] (2) Heat and melt the chemical composition of the driving gear at 1660°C, inject it into the mold formed in step (1), and release it after air cooling to obtain the driving gear blank;

[0053] (3) For the drive gear blank in step...

Embodiment 3

[0061] A drive gear provided in this embodiment, the chemical composition of the drive gear is: C: 0.22%, Si: 0.30%, Mn: 0.60%, Cr: 1.4%, Ni: 3.3%, Nb: 0.02%, V: 0.02%, Cu: 0.3%, P: 0.01%, S: 0.029%, lanthanide rare earth: 0.02%, the balance is Fe;

[0062] The chemical composition of the lanthanide rare earth is: La: 22%, Sc: 11%, Y: 17%, Sm: 21%; Gd: 19%, and other lanthanide elements: 10%.

[0063] The preparation method of above-mentioned drive gear, specifically carries out according to the following steps:

[0064] (1) The driving gear mold is made of molding sand and core sand as molding materials. Before making the mold, the molding sand in the molding material is first placed in an oven for drying;

[0065] (2) Heat and melt the chemical composition of the driving gear at 1670°C, inject it into the mold formed in step (1), and release it after air cooling to obtain the driving gear blank;

[0066] (3) For the driving gear blank in step (2), heat it at 305°C, then co...

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Abstract

The invention discloses a drive gear and a preparation method thereof. The drive gear consists of the following chemical components in percentage by weight: C, Si, Mn, Cr, Ni, Nb, V, Cu, P, S, lanthanide-series rear earths and the balance of Fe. The preparation method for the drive gear comprises the following steps: preparing a blank by adopting a casting mode; then, carrying out thermal treatment on the blank, a cutting process on rough-turning gear ring gear blank, a rough-milling gear-hobbing process, carburizing and nitriding treatment, tempering, hardening and tempering thermal treatment; and finally, carrying out a finish turning process and finish-milling gear-hobbing process and then inspecting, packaging and storing. The drive gear is high in strength, hardness and abrasive resistance, good in corrosion resistance and oxidization resistance, high in yield strength and tensile strength; and the gear processing method is simple, low in cost and good in molding performance.

Description

technical field [0001] The invention relates to a gear and a preparation method of the gear, in particular to a driving gear and a preparation method thereof. Background technique [0002] As one of the most basic transmission parts in the machinery industry, gears are used to adjust the speed and transmit power in mechanical devices. They play a key role in equipment including automobiles, machine tools, and cranes, and are widely used. When the gear is in operation, contact will be formed on the tooth surface to transmit power, the tooth will be subjected to huge alternating bending stress and contact stress, and a large friction force will also be generated between the tooth surfaces that mesh with each other. The damage form of the gear is mainly due to the fracture of the tooth part and the wear of the tooth surface. The choice of material has a great influence on the damage of the gear. [0003] With the continuous improvement of the technical parameters of modern mec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/48C21D9/32
Inventor 陆树根杨忠喜冯强龙
Owner 南京航迅机电有限公司
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