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Hot die forging and pressing process for sun wheel of automobile automatic gearbox

A technology of automatic transmission and hot die forging press, which is applied in the directions of wheels, vehicle parts, transportation and packaging, etc. It can solve the problems of sun gear processing that are not specifically described and have high universality, and achieve good convexity consistency and machining surplus. The effect of small quantity and high precision

Inactive Publication Date: 2016-01-27
JIANGSU BAOJIE FORGING
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

However, the patented method is too simple and universal, and does not specifically describe the processing of the sun gear

Method used

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Examples

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Embodiment Construction

[0038] The following examples are used to illustrate the present invention, but should not be used to limit the scope of the present invention. The implementation conditions used in the examples can be further adjusted according to the manufacturer's conditions, and the unspecified implementation conditions are usually conventional experimental conditions.

[0039] The invention provides a sun gear hot die forging process for an automatic gearbox of an automobile, comprising the following steps:

[0040] 1) Blank making

[0041] heating the alloy steel used to manufacture the sun gear to 1000-1100°C, and then putting it into a hot forging press for forging to obtain the sun gear blank;

[0042] 2) Spheroidizing annealing

[0043] The sun gear blank obtained in step 1) is taken out from the hot forging press, cooled to 800-850°C at a rate of 5°C / min, subjected to spheroidizing annealing treatment, kept for 2-3 hours, and then cooled to room temperature;

[0044] 3) Carburizi...

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PUM

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Abstract

The invention provides a hot die forging and pressing process for a sun wheel of an automobile automatic gearbox. The process includes the following steps of (1) blank making, (2) spheroidizing annealing, (3) carburizing, (4) quenching and tempering, (5) accurate grinding of inner holes, (6) counter bore grinding, (7) end face grinding, (8) accurate grinding of outer circles, (9) gear honing and (10) polishing and anti-rust oil coating. The hot die forging and pressing process is used for machining and molding the sun wheel of the automobile automatic gearbox, the obtained sun wheel is high in precision, the cutting time is short, the machining cost is low, environment friendliness is achieved, energy is saved, and the allowance for machining is little.

Description

technical field [0001] The invention relates to a sun gear hot die forging process for an automatic gearbox of an automobile. Background technique [0002] An automatic transmission is a transmission device that can automatically shift gears according to the vehicle speed and engine speed relative to the manual transmission. At present, there are four common types of automotive automatic transmissions, namely hydraulic automatic transmission (AT), mechanical continuously variable automatic transmission (CVT), electronically controlled mechanical automatic transmission (AMT) and dual-clutch automatic transmission. [0003] The planetary gear transmission mechanism in an automatic transmission includes four elements: sun gear, planetary gear, planet carrier, and ring gear. There is one sun gear and multiple planet gears in a planetary gear mechanism. Taking the input of the sun gear and the output of the planet carrier as an example, the sun gear drives several planet gears t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21J5/02B21K1/30
Inventor 吕景林赵剑忠
Owner JIANGSU BAOJIE FORGING
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