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Manufacturing method for automobile transmission gear

A technology of automobile gearbox and manufacturing method, which is applied in the field of automobile parts manufacturing, which can solve the problems that it is difficult to ensure the coaxiality of the inner hole and the side surface, the surface roughness does not meet the requirements, and the turning process cannot be completed, so as to achieve solid carburization Effect, good forging effect, small vibration and noise effect

Active Publication Date: 2015-03-25
JIANGXI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] 1. The existing manufacturing methods of automobile gearbox gears are simple, the quality of the produced products is average, and the general service life is not long;
[0004] 2. At present, most automotive gearbox gear blanks are turned by ordinary lathes, and all turning processes cannot be completed in one clamping, and it is difficult to ensure the coaxiality of the inner hole and the side surface, as well as the verticality of the end surface and the hole axis;
[0005] 3. Most of the existing gears of automobile transmission gears are hobbed by ordinary hobbing machines, the machining accuracy is low, and the surface roughness does not meet the requirements;
[0006] 4. Most of the existing automobile gearbox gears use the solid carburizing method, which is low in cost, but takes too long, and the thickness of the carburized layer is relatively thin;
[0007] 5. Most of the existing automobile transmission gears only use the heat treatment method of quenching, the effect is average, and the gear life is not long

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The method is carried out in ten steps. First, (1) forging blanks: heating the steel 18CrMnTi used for manufacturing automobile gearbox gears to 1120°C, and then putting the steel 18CrMnTi into a hot forging die to forge a gear blank. The forging adopts a closed Die forging, and use a hydraulic press as the forging equipment; then perform (2) spheroidizing annealing: take the forged gear blank out of the mold, place it in the air to cool to room temperature, and then put the gear blank in the furnace for spheroidizing annealing, The annealing temperature is set at 740°C, and after holding for 4 hours, it is cooled to room temperature with the furnace; then (3) turning process: after the furnace temperature drops to room temperature, take out the annealed gear blank, install and fix it on a CNC lathe for turning Machining, retaining a machining allowance of 0.5mm to 1.5mm for the outer dimension, using a CNC lathe to turn the gear blank, and once clamping, the machining o...

Embodiment 2

[0028] Repeat Example 1 according to the same steps described above, the difference is: step (1) forging embryo: the forging temperature is set to 1125 °C; step (2) spheroidizing annealing: the annealing temperature is set to 750 °C, after 3 hours of heat preservation Cool down to room temperature with the furnace; step (6) carburizing: set the carburizing temperature to 930°C, and hold for 29 hours; step (7) modulation: set the quenching temperature to 890°C, hold for 2 hours and place it in the air to cool, and set the tempering temperature to 580°C, after 4 hours of heat preservation, take out the gear and place it in the air to cool to room temperature.

Embodiment 3

[0030] Repeat Example 1 according to the same steps described above, the difference is: step (1) forging embryo: the forging temperature is set to 1130 °C; step (2) spheroidizing annealing: the annealing temperature is set to 760 °C, after 2 hours of heat preservation Cool down to room temperature with the furnace; step (6) carburizing: set the carburizing temperature to 950°C and keep it warm for 26 hours; step (7) modulation: set the quenching temperature to 910°C, put it in the air to cool after holding it for 1 hour, and set the tempering temperature to 630 ° C, after 2 hours of heat preservation, take out the gear and place it in the air to cool to room temperature.

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Abstract

The invention discloses a manufacturing method for an automobile transmission gear, and relates to the field of manufacturing of automobile parts. The method comprises the following steps: (1) blank forging, (2) spheroidizing annealing, (3) turning machining, (4) hobbing, (5) gear shaving, (6) carburization, (7) quenching and tempering and (8) grinding machining. According to the method, spheroidizing annealing treatment is adopted, so that the cutting performance of the gear is improved, a structure with spheroidized or granular carbide uniformly distributed on a ferrite substrate is obtained for preparation for subsequent heat treatment; a gas carburization method is adopted, and volatile kerosene is used as a carburizer, so that carburization effects are effectively improved, the thickness of a carburized layer is increased, the surface of the gear is hard and wear-proof, and high toughness of the core of the gear is maintained; quenching and tempering heat treatment is adopted after carburization, so that the carburization effects are further consolidated, and the mechanical performance of the gear is improved.

Description

technical field [0001] The invention belongs to the field of automobile parts manufacturing, and more specifically, the invention relates to a method for manufacturing an automobile transmission gear. Background technique [0002] Generally, gears with variable speed are collectively referred to as transmission gears. The commonly used material for transmission gears is forged steel. Transmission gears often work under conditions of high speed, high load, and constant alternation of speed and load. The speed change gears rely on their own structural dimensions. And the strength of the material to bear the external load, which requires the material to have high strength, toughness and wear resistance. Due to the complex shape of the transmission gear, high gear precision requirements, and good material method, the current manufacturing method of automobile transmission gears has the following technical problems: [0003] 1. The existing manufacturing methods of automobile ge...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/14
CPCB23P15/14
Inventor 程文明
Owner JIANGXI UNIV OF TECH
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