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Powder metallurgy transmission gear and manufacturing method thereof

A technology of transmission gear and powder metallurgy, which is applied in the direction of belt/chain/gear, mechanical equipment, manufacturing tools, etc., can solve the problems of inability to flexibly adjust the components of the material itself, increase the production cost, and large force torque, etc., to improve the quality of the material Utilization rate and productivity, increased self-lubricating performance, improved strength and hardness effects

Active Publication Date: 2011-09-14
宁波金钟粉末冶金有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of the existing transmission gears are machined with 40Cr material, the 40Cr material components are fixed, and the price is relatively high, and the components of the material itself cannot be flexibly adjusted according to the use environment to achieve performance suitable for use conditions; and Can not be made into oily parts, poor self-lubricating performance
[0003] Moreover, the prior art generally buys 40Cr materials and directly processes them to obtain transmission gears, but the machining process has high energy consumption, the processing size of the processed products is difficult to accurately control, and the product precision is low. Moreover, the machining process requires milling. Lost a lot of raw materials, resulting in waste of materials and increased production costs
[0004] The existing technology also adopts powder metallurgy processing technology to make, but the strength and hardness of the parts of the existing powder metallurgy technology can not stably reach the technical index of 40Cr material. In this case, the force torque is large and the applicable working conditions are harsh It is especially obvious on the transmission gears of larger specifications, therefore, it limits the application and promotion of powder metallurgy technology on automatic overrunning clutch transmission gears

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Weigh the raw materials of the following formula: 4% nickel, 1.5% copper, 0.85% molybdenum, 0.85% graphite, 0.8% lubricant (synthetic paraffin), 0.3% cutting agent (manganese sulfide), and the rest is iron.

[0019] The raw materials of each component in the formula ratio are uniformly mixed, and the green parts with a density of about 7.1 are obtained by pressing at a pressing pressure of 600Mpa; then the green parts are put into a mesh belt sintering furnace for sintering, and the sintering temperature is 1150°C. The sintering holding time is 30 to 40 minutes, and then it is lowered to room temperature with the furnace, and then finishing (finishing is mainly finished car step groove) to the final shape and precision; then heat treatment process: first quenching, the temperature is 860 ° C, holding time 3 hours; and then tempered at a temperature of 150° C., holding time for 2 hours, and then cooled to room temperature to obtain the powder metallurgy transmission gear ...

Embodiment 2

[0021] Weigh the raw materials of the following formula: 4% nickel, 1.5% copper, 0.5% molybdenum, 0.7% graphite, 0.8% lubricant (synthetic paraffin), 0.3% cutting agent (calcium fluoride), and the rest is iron.

[0022] The preparation method is the same as in Example 1.

Embodiment 3

[0024] Weigh the raw materials of the following formula: 3.5% nickel, 2% copper, 0.8% molybdenum, 0.6% graphite, 0.9% lubricant (synthetic paraffin), 0.5% cutting agent (calcium fluoride), and the rest is iron.

[0025] The preparation method is the same as in Example 1.

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Abstract

The invention discloses a powder metallurgy transmission gear which is prepared from the raw materials containing the following components in percentage by weight: 1-5% of nickel, 1-3% of copper, 0.5-2% of molybdenum, 0.5-0.9% of graphite, 0.6-0.9% of lubricant, 0.3-0.5% of cutting agent and the balance of ferrum. The invention also discloses a manufacturing method of the powder metallurgy transmission gear. The powder metallurgy transmission gear has good self-lubricating performance, can meet the requirement on different parts with various specifications of a transmission gear of an automatic overrun clutch, and can greatly reduce the manufacturing cost and increase the utilization ratio of materials and the production rate.

Description

technical field [0001] The invention relates to the technical field of powder metallurgy materials, in particular to a powder metallurgy transmission gear and a preparation method thereof. Background technique [0002] At present, the transmission gear of the automatic lock-up clutch used in the steering tie rod system of the automobile, its function is to transmit the torque of the transmission shaft to the front wheel of the automobile through the spline engagement of the transmission gear, so that the front wheel of the automobile changes from the driven wheel to the driving wheel , so that the car automatically realizes the transformation from two-wheel drive to four-wheel drive. However, most of the existing transmission gears are machined with 40Cr material, the 40Cr material components are fixed, and the price is relatively high, and the components of the material itself cannot be flexibly adjusted according to the use environment to achieve performance suitable for u...

Claims

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Application Information

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IPC IPC(8): B22F5/08B22F3/16C21D9/32F16H55/17
Inventor 张雷增
Owner 宁波金钟粉末冶金有限公司
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