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A light gear for vehicle and its manufacturing process

A gear manufacturing and gear technology, applied in the field of light vehicle gear and its manufacturing process, can solve the problems of insurmountable decarburization tendency, insignificant strengthening effect, high energy consumption of blank forging, and achieve reduction of friction coefficient, process time saving, The effect of low processing time

Active Publication Date: 2021-06-11
NANJING INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional manufacturing process includes blanking, forging blank, softening annealing, quenching and tempering, machining inner hole, drawing spline groove, finishing outer end face, inserting (rolling) teeth, tooth surface quenching + carburizing, honing, fitter Process (deburring, cleaning, oiling) and other steps, in which the energy consumption of blank forging is high, softening and annealing takes a long time, and during the quenching and tempering process, the parts are deformed greatly, and it is difficult to overcome the decarburization tendency during the quenching and tempering heat treatment process , the machining allowance that needs to be reserved is large, so the material consumption is large
In addition, due to the traditional surface quenching of low carbon steel such as induction heating or flame heating, the strengthening effect is not significant

Method used

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  • A light gear for vehicle and its manufacturing process
  • A light gear for vehicle and its manufacturing process
  • A light gear for vehicle and its manufacturing process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] Such as figure 2 As shown, a light gear for a vehicle has a center hole diameter of d=30mm, a length of L=20mm, and an outer diameter of the gear of D=74mm.

[0058] Such as figure 1 As shown, the process of manufacturing the above gears includes:

[0059] S1. Roughly machining the gear raw material to obtain a gear blank with a large central hole.

[0060] Step S1 specifically includes the following sub-steps:

[0061] S11. Use the fine blanking process to process a central small hole on the gear raw material. The diameter of the central small hole is 20mm, such as image 3 shown.

[0062] S12. Use the fine blanking process to expand the central small hole into a central large hole. The diameter of the central large hole is slightly less than 30mm, leaving a machining allowance for the subsequent boring. The allowance is about 1mm, such as Figure 4 shown.

[0063] In the above process, two fine blanking processes are used instead of traditional forging, which gre...

Embodiment 2

[0083] Such as Figure 5 As shown, the difference from Embodiment 1 is that in this embodiment, step S4 specifically includes the following sub-steps:

[0084] S41. This step is sulfurizing treatment. Specifically, when using the plasma beam to heat the gear semi-finished product, the surface of the tooth portion of the gear semi-finished product is heated to 170° C., and then kept for 2 hours to complete the sulfurizing treatment to obtain a sulfidation treatment with a thickness of 10-20 μm. sulfur layer.

[0085] S42. This step is a surface quenching treatment. Specifically, use a plasma beam to continue heating the teeth of the semi-finished gear to 450°C and keep it warm for 1 hour. During this process, nitrogen is used as a protective gas, and a small amount of methane is added to the nitrogen for the surface. Oxidation-free protection of quenching while achieving carbonitriding. Nitrogen was added at a rate of 75 ml / min, and methane was added at a rate of 15 ml / min. ...

Embodiment 3

[0087] A manufacturing process of light gears for vehicles, the diameter of the central hole of the gear is d=35mm, the length L=25mm, and the outer diameter of the gear is D=85mm. Including the following steps:

[0088] S1. Roughly machining the gear raw material to obtain a gear blank with a large central hole.

[0089] Step S1 specifically includes the following sub-steps:

[0090] S11, using a fine blanking process to process a central small hole on the gear raw material, the diameter of the central small hole is 25 mm.

[0091] S12. Enlarging the central small hole into a central large hole by adopting a fine blanking process, the diameter of the central large hole is slightly smaller than 35mm, leaving a machining allowance for subsequent boring, and the allowance is 1mm.

[0092] S2, performing heat treatment on the gear blank.

[0093] Step S2 specifically includes the following sub-steps:

[0094] S21. This step is normalizing treatment. Specifically, the gear bla...

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Abstract

The invention discloses a light-duty gear manufacturing process for vehicles, which includes the following steps: S1, rough machining the gear raw material to obtain a gear blank with a large central hole; S2, performing heat treatment on the gear blank; S3, processing the gear blank Perform semi-finishing to obtain a semi-finished gear with teeth; S4, perform plasma surface quenching carbonitriding treatment and sulfurizing treatment on the semi-finished gear; S5, perform secondary finishing on the semi-finished gear to obtain a finished gear. The invention reduces the quenching time and energy consumption, reduces the surface friction coefficient and improves the surface wear resistance through the surface quenching, carbonitriding and sulfurizing treatment of the teeth.

Description

technical field [0001] The invention belongs to the technical field of auto parts, and in particular relates to a light gear for vehicles and a manufacturing process thereof. Background technique [0002] Gear is a very important and heavily used part in a car, mainly used to transmit power, adjust speed or direction. The general force situation is that the tooth part bears a large alternating bending stress, and the tooth surfaces roll and slide with each other and bear contact pressure stress. Therefore, the gear material is required to have high bending fatigue strength and contact fatigue strength, the tooth surface has high hardness and wear resistance, the gear core has certain strength and toughness, and it is also required to have small deformation, high precision, and low noise. In addition, automotive products require high production efficiency, low energy consumption, and low product cost. [0003] Automotive gears can be roughly divided into light-duty gears, m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C8/38B23P15/14C21D9/32C21D1/28C21D1/09F16H55/17F16H55/06
CPCB23P15/14C21D1/09C21D1/28C21D9/32C23C8/38F16H55/06F16H55/17
Inventor 赵振东
Owner NANJING INST OF TECH
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