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Manufacture of high-density helical gear

A technology of a helical gear and a manufacturing method, applied in the field of powder metallurgy, can solve the problems of poor tooth shape accuracy, high price, difficult processing, etc., and achieve the effects of reducing production cost, improving production efficiency, and simple production process

Inactive Publication Date: 2005-12-14
扬州意得机械有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Existing helical gears may be processed by machining methods, such as blanking, forging, quenching and tempering, initial turning, gear hobbing / washing, finishing turning, etc. The processing steps are many, the processing is difficult, and the material utilization rate is low. , High price, poor batch consistency, not suitable for interchangeability requirements in industrial production; or use powder metallurgy to obtain 7.1-7.2g / cm2 after recompression and refiring 3 Sub-high-density billet, and then the finished product is obtained through the gear hobbing process, but this processing method has low raw material utilization rate, poor tooth shape accuracy, and poor batch consistency. It is not suitable for mass production, which restricts the development of the electric tool industry.

Method used

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Experimental program
Comparison scheme
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Embodiment Construction

[0006] 1. Mix the powder raw materials according to the following proportions:

[0007] Component Mass percent (%)

[0008] Atomized iron powder 92.4-97.3

[0009] Nickel powder 1-3

[0010] Copper powder 1-3

[0011] Toner 0.4-0.8

[0012] Polymer-based lubricant 0.3-0.8

[0013] 2. Put the mixed powder into the hopper, heat it to 90-120°C with heat medium oil, and then transport it to the mold cavity through the powder delivery pipe heated to 100-130°C;

[0014] 3. The heating rod built in the female mold heats the mold cavity to 100-130°C, and presses at a pressure of 550-600Mpa. During pressing, the upper die punch, lower die punch, lower inner die punch, and core rod can be centered on the axis spiral movement. The density of the molded product after pressing is 7.32cm 3 ;

[0015] 4. The molded product is sintered at 1120°C, held in a protective atmosphere of decomposed ammonia or endothermic atmosphere for 20-40 minutes, and then cooled with the furnace to obtai...

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Abstract

The present invention is manufacture process of high density helical gear in powder metallurgical technology, and features that the compounded homogeneously mixed powder material with polymer-base lubricant is first heated with hot medium oil to 90-120 deg.c, then fed through pre-heated conveying pipe to mold cavity in 100-130 deg.c and pressed at 550-600 MPa pressure into the high density helical gear product with density higher than 7.2 g / cu cm. The pressed product is sintered in netted belt furnace at 1120 deg.c at protecting atmosphere for decades min before cooling in the furnace to room temperature. The present invention has simple production process, high efficiency and low cost, and is used in producing gear assembly for great power electrically driven tool and other use.

Description

technical field [0001] The invention relates to a manufacturing method in the technical field of powder metallurgy, in particular to a manufacturing method of a high-density helical gear. Background technique [0002] The high-density helical gear is the primary transmission gear between the motor and output of high-power electric tools. Its function is to transmit the torque output by the motor to the output terminal through the helical gear. Existing helical gears may be processed by machining methods, such as blanking, forging, quenching and tempering, initial turning, gear hobbing / washing, finishing turning, etc. The processing steps are many, the processing is difficult, and the material utilization rate is low. , High price, poor batch consistency, not suitable for interchangeability requirements in industrial production; or use powder metallurgy to obtain 7.1-7.2g / cm2 after recompression and refiring 3 Sub-high-density blanks are then hobbed to obtain finished produc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F5/08
Inventor 徐哲之叶桂斌
Owner 扬州意得机械有限公司
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