Laser quenching hardening method for tooth root of inner gear ring

An internal gear and laser technology, used in furnaces, heat treatment equipment, heat treatment furnaces, etc., can solve the problems of large deformation randomness, large heat treatment deformation, high energy consumption, high limit torque and fatigue life, and small quenching deformation. Effect

Inactive Publication Date: 2012-09-12
CHINA FIRST AUTOMOBILE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the ring gear is a large-sized thin-walled part, and the traditional technology (such as carburizing, high-frequency, etc.) has large heat treatment deformation, and the deformation is very random, resulting in out-of-tolerance size of the ring gear and high scrap rate
Although the deformation of nitriding technology is small, the energy consumption is high

Method used

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  • Laser quenching hardening method for tooth root of inner gear ring
  • Laser quenching hardening method for tooth root of inner gear ring
  • Laser quenching hardening method for tooth root of inner gear ring

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] Such as figure 1 , 2 As shown, the laser quenching and hardening method of the bottom of each tooth groove and the two sides of the tooth root of the ring gear 1 is the same. The specific method is as follows: (1) Place the ring gear on the fixture of the rotary table, and the teeth The long direction is perpendicular to the table top of the rotary table; (2) A diaphragm is placed on the upper end of the ring gear 1; (3) The laser power is reasonably matched to 1500W, the scanning speed of the laser beam is 25mm / min, the focal length of the focusing mirror is 500mm, and the absolute value of the defocus amount is <50mm, the protective gas is argon and nitrogen; (4) The laser beam is incident along the diameter of the ring gear to the bottom of the tooth groove of the ring gear and the surface to be quenched on the sides of the two connected tooth roots; (5) The light guide head moves up and down, Coupled with the periodic small-angle indexing rotation of the rotary tab...

Embodiment 2

[0012] Such as figure 1 , 2 As shown, the laser hardening treatment method for the surface of each alveolar bottom of the ring gear 1 and the two connected tooth root sides that need to be quenched is the same, and the specific treatment method is as follows: (1) Place the ring gear 1 on the rotary table clamp On the tool, the tooth length direction is perpendicular to the table top of the rotary table; (2) A diaphragm is placed on the upper end of the ring gear 1; (3) The laser power is reasonably matched to 1600W, the laser beam scanning speed is 20mm / min, the focal length of the focusing lens is 500mm, and the defocus The absolute value of the volume is <60mm, and the protective gas is argon and nitrogen; (4) The two laser beams coming out of the beam splitter are incident on the bottom of the tooth groove of the ring gear and the quenched surface of the tooth sides of the ring gear at 40°~70°; ( 5) The light guide head moves up and down, coupled with the periodic small-an...

Embodiment 3

[0014] Such as figure 1 , 2 As shown, the laser hardening treatment method for the surface of each tooth groove bottom of the ring gear 1 and the two connected tooth root sides that need to be quenched is the same, and the specific treatment method is as follows: (1) Place the ring gear on the fixture of the rotary table above, the tooth length direction is perpendicular to the table top of the rotary table; (2) A stop ring is placed on the upper end of the ring gear 1; (3) Reasonably match the laser power to 4000W, the laser beam scanning speed to 30mm / min, the focal length of the focusing mirror to 600mm, and the defocus The absolute value of the volume is <70mm, and the protective gas is argon and nitrogen; (4) The two laser beams coming out of the beam splitter are incident on the surface of the ring gear tooth root to be quenched at 40°~70°; (6) The light guide head moves up and down , coupled with the periodic small-angle indexing rotation of the rotary table, forming a...

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Abstract

The invention relates to a laser quenching hardening method for a tooth root of an inner gear ring. The method is characterized by comprising the following specific steps of: placing the inner gear ring on a special clamp on a digital control precise rotary working table, and placing a light blocking ring at the upper end of the gear ring; allowing a single laser beam or double laser beams to enter the surface to be quenched of the bottom of the tooth space of the gear ring, and the connected tooth side at an angle of 20 to 90 degrees; and moving a light guide head up and down or moving the light guide head up and down and rotating, and forming a laser hardening belt on a treatment surface, wherein the tooth root of the gear ring is quickly scanned by the laser beam with highly concentrated energy to ensure that the surface temperature of the scanned tooth root of the gear ring is raised quickly to over a phase change point, the quenching deformation is small compared with that of the conventional thermal treatment process, and energy consumption is reduced.

Description

technical field [0001] The invention relates to a method for laser quenching and hardening of tooth roots of internal gears, in particular to a method for selective laser quenching and hardening of tooth roots of internal gears (hereinafter referred to as gears), which belongs to the processing method of deceleration and transmission mechanism parts. Background technique [0002] The ring gear is an important part in the deceleration and speed change mechanism of automobiles, wind power generation, cement mills and other products, such as the ring gear of the automobile wheel reduction axle. The coordination precision between the various parts in the deceleration and transmission mechanism is required to be high, and the ring gear is one of the key components. The tooth root of the ring gear is required to have proper strength and the tooth surface has high surface hardness. However, the ring gear is a large-sized thin-walled part, and the traditional technology (such as ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/32C21D1/09
Inventor 姚远郑培和魏伟陈明李潇一孔德举喻皓淳秦芳张敏
Owner CHINA FIRST AUTOMOBILE
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