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Powder metallurgy manufacturing technology of synchronizer gear hub

A technology of powder metallurgy and manufacturing process, applied in the field of powder metallurgy, which can solve the problems of increasing production cost, poor production continuity, prolonging the process flow, etc., and achieve the effects of saving steps, avoiding oxidation, and high dimensional accuracy

Inactive Publication Date: 2016-04-20
BIMENGJI SHANGHAI COMPOSITE MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the existing technology, two sinterings are used to slow down the forming, but after forming, it is necessary to rely on shaping to improve the precision of the tooth shape, prolonging the process flow, poor production continuity and increasing production costs

Method used

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  • Powder metallurgy manufacturing technology of synchronizer gear hub
  • Powder metallurgy manufacturing technology of synchronizer gear hub
  • Powder metallurgy manufacturing technology of synchronizer gear hub

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] ①Compressing step: The raw material powder prepared according to 0.6% graphite, 1.5% copper, 4% nickel, 0.5% molybdenum and 93.4% iron is added to the cavity of the press, pressurized to 600MPa, and the blank is obtained after demoulding;

[0031] ② Sintering and hardening step: put the blank into a continuous sintering furnace, heat it to 1100°C for 30 minutes under the protection of hydrogen, and sinter at a cooling rate of 2.5-5°C / s to obtain a hardened body;

[0032] ③Machining step: Fix the hardened body on the CNC equipment, and process it in a small amount to meet the size and shape requirements;

[0033] ④Burr brushing step: use the burr brushing equipment to carry out surface treatment on the product, remove the burr, and obtain the product;

[0034] ⑤ Inspection and packaging steps: Check the surface condition of the product, and pack the non-defective product.

Embodiment 2

[0036] ① Pressing step: The raw material powder prepared according to 0.5% graphite, 1.3% copper, 3.5% nickel, 0.4% molybdenum and 94.3% iron is added to the cavity of the press, pressurized to 500MPa, and the blank is obtained after demoulding;

[0037] ② Sintering and hardening step: put the blank into a continuous sintering furnace, heat it to 1100°C for 45 minutes under the protection of hydrogen, and sinter at a cooling rate of 2.5-5°C / s to obtain a hardened body;

[0038] ③Machining step: Fix the hardened body on the CNC equipment, and process it in a small amount to meet the size and shape requirements;

[0039] ④Burr brushing step: use the burr brushing equipment to carry out surface treatment on the product, remove the burr, and obtain the product;

[0040] ⑤ Inspection and packaging steps: Check the surface condition of the product, and pack the non-defective product.

Embodiment 3

[0042] ①Compressing step: The raw material powder prepared according to 0.7% graphite, 1.7% copper, 4.5% nickel, 0.6% molybdenum and 92.5% iron is added to the cavity of the press, pressurized to 700MPa, and the blank is obtained after demoulding;

[0043] ② Sintering and hardening step: put the blank into a continuous sintering furnace, heat it to 1200°C for 40 minutes under the protection of hydrogen, and sinter at a cooling rate of 2.5-5°C / s to obtain a hardened body;

[0044] ③Machining step: Fix the hardened body on the CNC equipment, and process it in a small amount to meet the size and shape requirements;

[0045] ④Burr brushing step: use the burr brushing equipment to carry out surface treatment on the product, remove the burr, and obtain the product;

[0046] ⑤ Inspection and packaging steps: Check the surface condition of the product, and pack the non-defective product.

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Abstract

The invention belongs to the technical field of powder metallurgy, and relates to a powder metallurgy manufacturing technology of a synchronizer gear hub. The powder metallurgy manufacturing technology comprises the steps that prepared raw material powder is placed into a press die cavity and pressed to form a blank, the blank is processed through air cooling to form a hardened body after the blank is sintered in an oxygen-free environment, and testing and packaging are conducted after finish machining of the hardened body is accomplished and burrs are brushed away. By the adoption of the powder metallurgy manufacturing technology, air-blast quenching is utilized under the condition of the high temperature during the later period of the sintering process of the blank, so that the number of steps is reduced, the dimensional accuracy of products is high, and the yield is high.

Description

technical field [0001] The invention relates to the technical field of powder metallurgy, in particular to a powder metallurgy manufacturing process for a synchronizer gear hub. Background technique [0002] Synchronizer gear hub is an important part of automobile gearbox. Because of its shape, it requires high strength, so it is usually formed by powder metallurgy process. The powder metallurgy process has a very high raw material utilization rate, up to 90%. Due to the certain porosity inside, it not only reduces the weight of the product, but also the pores can absorb vibration during operation, and the lubricating oil in the pores can increase the wear resistance and Lubricity. [0003] There are many tooth structures in the synchronizer gear hub. There is also a keyway 1 on the synchronizer gear hub. The teeth closest to both sides of the keyway 1 are deformed teeth 2, and other positions are normal teeth 3. The deformed teeth 2 and normal teeth 3 are in the same posit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F5/08B22F3/16B22F3/24B22F1/00B22F3/02C22C38/16C22C38/08C22C38/12
CPCB22F1/0003B22F3/02B22F3/16B22F3/24B22F5/08B22F2003/247B22F2003/248B22F2999/00C22C38/002C22C38/08C22C38/12C22C38/16B22F3/10B22F2201/013
Inventor 陈珠洪
Owner BIMENGJI SHANGHAI COMPOSITE MATERIALS CO LTD