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Manufacturing method for planetary support of electric power tool gear box

A technology for planetary brackets and electric tools, which is applied to belts/chains/gears, mechanical equipment, transmission parts, etc. It can solve the problems of inability to manufacture structural parts, poor assembly accuracy, and difficult processing, so as to avoid cracks, Improved torsional performance and high production efficiency

Inactive Publication Date: 2011-04-06
扬州保来得科技实业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Traditional powder metallurgy technology cannot manufacture parts with very complex structures due to complex processing procedures, high processing difficulty, poor assembly accuracy, low material utilization rate, and high price.
The planetary carrier of the electric tool gearbox is a key part of the gearbox production. It is composed of two disc-shaped parts, the upper and the lower. In order to arrange the planetary gears between the two discs, two A support leg, in the past, traditional complex forging machining technology was used, resulting in complicated production process and high processing cost.

Method used

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  • Manufacturing method for planetary support of electric power tool gear box
  • Manufacturing method for planetary support of electric power tool gear box
  • Manufacturing method for planetary support of electric power tool gear box

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The ingredient weight composition of the upper cover and the lower cover: 0.5%C, 3%Ni, 1.5%Mo, and the rest is Fe.

[0026] The batching weight composition of solder: 40% Ni, 40% Cu, 20% Mn.

[0027] Preparation methods include:

[0028] (1) Ingredients: Do ingredients according to the above formula.

[0029] (2) Forming: The planetary bracket of the electric tool gearbox is decomposed into two independent powder metallurgy parts: an upper cover with a flange and a lower cover with a support section, and a 60-ton powder extrusion molding machine is used to convert the powder metallurgy The component materials are formed individually by cavity extrusion. The density of the supporting legs of the lower cover reaches 6.9~7.0g / cm 3 , and ensure that there are no cracks at the root of the two supporting legs. A groove is provided on the end face of the upper cover.

[0030] (3) Pre-sintering: The upper cover and the lower cover are respectively placed in a common mesh b...

Embodiment 2

[0038] The weight composition of the top cover and the bottom cover: 1.0%C, 1.0%Ni, 0.5%Mo, and the rest is Fe.

[0039] The batch weight composition of solder: 45% Ni, 30% Cu, 25% Mn.

[0040] Preparation methods include:

[0041] (1) Ingredients: Do ingredients according to the above formula.

[0042] (2) Forming: The planetary bracket of the electric tool gearbox is decomposed into two independent powder metallurgy parts: an upper cover with a flange and a lower cover with a support section, and a 60-ton powder extrusion molding machine is used to convert the powder metallurgy The component materials are formed individually by cavity extrusion. The density of the supporting legs of the lower cover reaches 6.9~7.0g / cm 3 , and ensure that there are no cracks at the root of the two supporting legs. A groove is provided on the end face of the upper cover.

[0043] (3) Pre-sintering: The upper cover and the lower cover are respectively placed in a common mesh belt furnace a...

Embodiment 3

[0051] The weight composition of the upper cover and the lower cover: 0.2%C, 2.0%Ni, 2.0%Mo, and the rest is Fe.

[0052] The batch weight composition of solder: 30% Ni, 45% Cu, 25% Mn.

[0053] Preparation methods include:

[0054] (1) Ingredients: Do ingredients according to the above formula.

[0055] (2) Forming: The planetary bracket of the electric tool gearbox is decomposed into two independent powder metallurgy parts: an upper cover with a flange and a lower cover with a support section, and a 60-ton powder extrusion molding machine is used to convert the powder metallurgy The component materials are formed individually by cavity extrusion. The density of the supporting legs of the lower cover reaches 6.9~7.0g / cm 3 , and ensure that there are no cracks at the root of the two supporting legs. A groove is provided on the end face of the upper cover.

[0056] (3) Pre-sintering: The upper cover and the lower cover are respectively placed in a common mesh belt furnace ...

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Abstract

The invention discloses a manufacturing method for a planetary support of an electric power tool gear box. The method comprises the following steps: respectively extruding to form an upper cover with a flange and a lower cover with a support section; respectively presintering the upper cover and the lower cover; then primarily jointing the upper cover and the lower cover by a locating pin; integrally welding through sintering; carrying out heat treatment and then releasing the locating pin; and using a specific jig to press a planetary gear and a functional pin. In the invention, the planetary support of the electric power tool gear box is decomposed into two independent powder metallurgy parts, and after being subject to extrusion forming, the two metallurgy parts are subject to welding assembly. As extrusion forming is carried out respectively, the density of each support leg part is up to 6.9-7.0g / cm<3>, the anti-torsion of products can be improved, and crackles on the root part of each support leg are avoided. Two major parts are respectively manufactured, thereby being more convenient for ensuring the accuracy of the products. In the invention, products with complex structures can be processed featuring low cost, high accuracy and high efficiency.

Description

technical field [0001] The invention relates to a processing technology of mechanical parts, in particular to a preparation method of a planetary support of a gear box of an electric tool. Background technique [0002] Traditional powder metallurgy technology cannot manufacture parts with very complex structures due to complex processing procedures, high processing difficulty, poor assembly accuracy, low material utilization rate, and high price. The planetary carrier of the electric tool gearbox is a key part of the gearbox production. It is composed of two disc-shaped parts, the upper and the lower. In order to arrange the planetary gears between the two discs, two In the past, the traditional complex forging machining technology was used for the supporting legs, which resulted in complicated production process and high processing cost. Contents of the invention [0003] Purpose of the invention: In view of the deficiencies in the prior art, the purpose of the present i...

Claims

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Application Information

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IPC IPC(8): F16H57/08
Inventor 曹爱玲水出格周挺官劲松胡云峰
Owner 扬州保来得科技实业有限公司
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