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Powder metallurgy preparation method of double-clutch large-torque automatic gearbox synchronizer gear hub

An automatic gearbox and powder metallurgy technology, applied in the field of powder metallurgy auto parts, can solve the problems of high brush loss, affecting the precision of finished products, and slow deburring efficiency, so as to improve the tensile strength and fatigue life, and improve the tooth profile and dimensional accuracy, avoiding the effect of excessive tensile stress

Inactive Publication Date: 2019-06-07
江苏智造新材有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Limitations of the existing technology: (1) When the synchronizer of the dual-clutch high-torque automatic transmission is working, due to the large torque carried, the joint rib between the special-shaped keyway of the gear hub and the hub body is the weakest part. When the tensile stress is large, this place is the point of force action, and it is the first to break, and it is easy to exceed the tensile strength and cause the gear hub to break
The gear hub produced by the prior art cannot fundamentally solve the fracture failure risk
(2) Due to the high hardness and brittleness after sintering, it is difficult to shape, and it is easy to generate shape cracks
(3) Due to the high hardness after sintering, the CNC machining efficiency is slow, the tool loss is large, the energy consumption is high, the deburring efficiency is slow, and the brush loss is high
(4) High-frequency quenching thermal shock produces high stress, which causes the deformation of the gear hub to affect the precision of the finished product, and at the same time there is a risk of local cracks

Method used

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  • Powder metallurgy preparation method of double-clutch large-torque automatic gearbox synchronizer gear hub
  • Powder metallurgy preparation method of double-clutch large-torque automatic gearbox synchronizer gear hub
  • Powder metallurgy preparation method of double-clutch large-torque automatic gearbox synchronizer gear hub

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Experimental program
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Effect test

Embodiment 1

[0029] Embodiment 1: A powder metallurgy preparation method for a synchronizer gear hub of a dual-clutch high-torque automatic transmission includes the following steps:

[0030] (1) Mixing: Design the composition and mixing of raw materials, and mix the following raw materials uniformly by mass percentage: C: 0.7%, Cu: 1.3%; Ni: 4.5%; Mo: 0.4%, the rest is Fe and unavoidable Impurities are metallurgical raw materials.

[0031] (2) Forming: put the metallurgical raw materials obtained in step (1) into the forming machine, and press with a 500T CNC forming press, the overall density of the gear hub is 7.05g / cm 3, the density of the special-shaped keyway and the connecting rib of the gear hub body is 7.12g / cm 3 ; Segmentation density of each forming section≤0.2g / cm 3 , there are no cracks at the joints of each part of the green body. After the green body is demolded, the burr is automatically brushed to obtain the tooth hub.

[0032] (3) Pre-sintering: take the gear hub obta...

Embodiment 2

[0042] Embodiment 2: A powder metallurgy preparation method for a synchronizer gear hub of a dual-clutch high-torque automatic gearbox comprises the following steps:

[0043] (1) Mixing: Design the composition and mixing of raw materials, and mix the following raw materials uniformly by mass percentage: C: 0.5%, Cu: 1.7%; Ni: 3.5%; Mo: 0.6%%, the rest is Fe and unavoidable The impurities are obtained as powder metallurgy raw materials.

[0044] (2) Forming: put the metallurgical raw materials obtained in step (1) into the forming machine, and press with a 500T CNC forming press, the overall density of the gear hub is 7.08g / cm 3 , the density at the connecting rib between the special-shaped keyway and the gear hub body is 7.11g / cm 3 ; Segmentation density of each forming section≤0.2g / cm 3 , there are no cracks at the joints of each part of the green body. After the green body is demolded, the burr is automatically brushed to obtain the tooth hub.

[0045] (3) Pre-sintering:...

Embodiment 3

[0055] Embodiment 3: A powder metallurgy preparation method for a synchronizer gear hub of a dual-clutch high-torque automatic gearbox comprises the following steps:

[0056] (1) Mixing: Design the composition and mixing of raw materials, and mix the following raw materials uniformly by mass percentage: C: 0.6%, Cu: 1.5%; Ni: 4.0%; Mo: 0.5%, the rest is Fe and unavoidable Impurities are metallurgical raw materials.

[0057] (2) Forming: put the metallurgical raw materials obtained in step (1) into the forming machine, and press with a 500T CNC forming press, the overall density of the gear hub is 7.06g / cm 3 , the density of the special-shaped keyway and the connecting rib of the gear hub body is 7.13g / cm 3 ; Segmentation density of each forming section≤0.2g / cm 3 , there are no cracks at the joints of each part of the green body. After the green body is demolded, the burr is automatically brushed to obtain the tooth hub.

[0058] (3) Pre-sintering: take the gear hub obtaine...

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Abstract

The invention belongs to the technical field of powder metallurgy, and relates to a powder metallurgy preparation method of a double-clutch large-torque automatic gearbox synchronizer gear hub. The powder metallurgy preparation method comprises the following steps of material mixing, forming, pre-sintering, shaping, machining, deburring, sintering hardening, tempering, partial shot blasting, cleaning and packaging. According to the synchronizer gear hub produced by the preparation method, the tensile strength is increased, and the fracture risk caused by increase of the torque of a transmission is reduced; the production efficiency of shaping, machining and deburring is improved, the risk of shaping cracks is effectively avoided, loss of material of a machining tool, a deburring brush andthe like is greatly reduced, production energy consumption is greatly reduced, the high-frequency quenching process is omitted, the product quality is improved, the comprehensive cost is reduced by 20% or above on the basis of the original foundation, and the preparation method is suitable for large-scale production of the double-clutch large-torque automatic gearbox synchronizer gear hub throughpowder metallurgy.

Description

technical field [0001] The invention relates to the technical field of powder metallurgy automobile parts, in particular to a powder metallurgy preparation method of a synchronizer hub of a dual-clutch high-torque automatic transmission. Background technique [0002] With the continuous development and improvement of automotive technology, drivers and passengers have higher and higher requirements for the comfort of the car, and dual-clutch represents the development direction of automatic transmissions. As the displacement of the car increases, the maximum torque that the transmission can withstand also increases. Generally, the maximum torque of the gearboxes mounted on low- and medium-displacement passenger cars is below 300N.M. The gearboxes mounted on high-displacement luxury models are generally dual-clutch high-torque automatic gearboxes, and the conventional maximum torque requirements are around 400N.M. . The dual-clutch high-torque automatic transmission does not...

Claims

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Application Information

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IPC IPC(8): C22C38/16C22C38/08C22C38/12B22F5/08B22F3/24B22F3/16
Inventor 施昌旭夏敏石小荣张艳伟戴定中黄亿奇
Owner 江苏智造新材有限公司
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