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Laser welding method for carburized gear wheel of automobile gearbox

A technology of automobile gearbox and laser welding, which is applied to laser welding equipment, welding equipment, metal processing equipment, etc., can solve the problems that the flexibility is not as good as laser welding, and achieve the effects of flexible welding, improved productivity, and simple process

Active Publication Date: 2005-03-23
CHINA FIRST AUTOMOBILE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, electron beam welding needs to be carried out under vacuum conditions and generates X-rays, and its welding flexibility is not as good as laser welding

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Welding the CAS5-20 gearbox first-speed gear and cone assembly, the steps are: (1) Carburizing the surface of the gear welded to prevent carburization so that there is no carburized layer in this part after carburizing the gear; Before the parts are carburized, the anti-carburization coating is placed on the surface to be welded by laser by brushing or automatic spraying. The width from the upper surface of the weld is 4mm; after carburizing, quenching, tempering, shot blasting, etc., the gear parts to be welded are pressed together and ready for laser welding.

[0014] (2) The gear is clamped on the positioning fixture of the tiltable CNC rotary table, so that the gear rotates as required during the laser welding process to achieve different welding speeds.

[0015] (3) The light guide system adopts a reflective focusing structure to transmit the focused laser beam to the center of the gear welding seam area, so that the focus defocus of the laser beam is -2mm.

[001...

Embodiment 2

[0019] Welding the CAS5-20 gearbox first-speed gear and cone assembly, the steps are: (1) Carburizing the surface of the gear welded to prevent carburization so that there is no carburized layer in this part after carburizing the gear; Before carburizing the parts, apply the anti-carburizing coating on the surface to be welded by brushing or automatic spraying. The coating area on the welding surface of each piece is 4mm wide from the center line of the weld; the coating area on the end surface of each welding piece The width from the upper surface of the weld is 6mm; after carburizing, quenching, tempering, shot blasting and other treatments, the gear parts to be welded are pressed together and ready for laser welding.

[0020] (2) The gear is clamped on the positioning fixture of the tiltable CNC rotary table, so that the gear rotates as required during the laser welding process to achieve different welding speeds.

[0021] (3) A light guide system with a reflective focusing...

Embodiment 3

[0025] Welding the CAS5-20 gearbox first-speed gear and cone assembly, the steps are: (1) Carburizing the surface of the gear welded to prevent carburization so that there is no carburized layer in this part after carburizing the gear; Before the parts are carburized, the anti-carburization coating is placed on the surface to be welded by laser by brushing or automatic spraying. The width from the upper surface of the weld is 8mm; after carburizing, quenching, tempering, shot peening and other treatments, the gear parts to be welded are pressed together and ready for laser welding.

[0026] (2) The gear is clamped on the positioning fixture of the tiltable CNC rotary table, so that the gear rotates as required during the laser welding process to achieve different welding speeds.

[0027] (3) A light guide system with a reflective focusing structure transmits the focused laser beam to the center of the gear welding seam area, so that the focus of the laser beam is defocused by ...

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PUM

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Abstract

A laser welding method for the carbonized gear in speed variator of car includes such steps as machining, anticarbonizing, carbonizing, quenching, tempering, grinding teeth and laser welding.

Description

Technical field: [0001] The invention relates to a laser welding method after carburizing of an automobile transmission gear, and belongs to the field of laser welding. Background technique: [0002] Most of the gears of automobile transmissions adopt the surface strengthening process of carburizing and quenching. At present, the laser welding of the gears of automobile transmissions is carried out before carburizing; with the rapid development of the automobile industry, high-quality transmission gears are gradually adopting the gear grinding process. In order to improve the gear precision and reduce the running noise. However, the gear grinding process needs to be carried out after carburizing and quenching, and the welded gear assembly cannot be ground due to structural limitations after carburizing and quenching. Similar welding processes include electron beam welding and the like. However, electron beam welding needs to be carried out under vacuum conditions and gener...

Claims

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Application Information

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IPC IPC(8): B23K26/06B23K26/12B23K26/24B23K26/60
Inventor 魏伟姚远郑培和陈明喻皓淳孔德举秦芳
Owner CHINA FIRST AUTOMOBILE
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