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A Method for Reducing Gear Induction Quenching Deformation

A technology of induction hardening and gears, which is applied in the processing of gears and reduces the deformation of gears by induction hardening. It can solve problems such as size deformation and gear distortion, and achieve the effect of small induction hardening deformation and elimination of deformation deviation after heating.

Active Publication Date: 2020-09-04
CRRC QISHUYAN INSTITUTE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, gear induction hardening generally adopts the single-tooth-by-tooth quenching process, but it will produce more obvious dimensional deformation. The heating position of medium modulus gears (gears with a modulus below 25) produces long protrusions of 0.1~0.3mm, and the larger the modulus The larger the diameter, the larger the deformation will be, resulting in gear distortion. Therefore, the tooth finishing after the gear quenching process generally uses grinding to solve the deformation problem.

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  • A Method for Reducing Gear Induction Quenching Deformation
  • A Method for Reducing Gear Induction Quenching Deformation
  • A Method for Reducing Gear Induction Quenching Deformation

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Embodiment 1

[0019] This embodiment discloses a method for reducing gear induction quenching deformation. The gear parameters in this embodiment are as follows: modulus 5.5, number of teeth 107, tooth width 90mm, pressure angle 20°, and helix angle 16°.

[0020] Specific treatment method: gear induction hardening is divided into 4 equal divisions, and the number of teeth in each division is 107 / 4 teeth (take an integer), of which 27 teeth are used for the 1~3 division area; 26 teeth are used for the fourth division area. For example, in the report, three planes perpendicular to the gear axis are made at the heights of 9mm, 45mm, and 81mm from the lower end of the gear, and the intersection points of the left and right tooth surfaces of the three planes with a diameter of Φ600.3mm and the root circle of the gear are measured with a probe. Coordinate value, the average value of the first, middle, and last cogging coordinate value errors in each area (the average value of the distance deviatio...

Embodiment 2

[0024] This embodiment discloses a method for reducing induction quenching deformation of spur gears. The gear parameters in this embodiment are as follows: modulus 12, number of teeth 63, tooth width 140mm, pressure angle 20°, and helix angle 0°.

[0025] Specific heat treatment processing method: gear induction hardening is divided into 3 equal areas, and the number of teeth in each equal area is 63 / 3 teeth (take an integer), so each equal area is 21 teeth. For example, in the report, three planes perpendicular to the gear axis are made at the heights of 14mm, 70mm, and 126mm from the lower end of the gear, and the intersection points of the left and right tooth surfaces of the three planes with a radius of R375.3mm and the root circle of the gear are measured with a probe Coordinate value, the average value of the first, middle, and last cogging coordinate value errors in each area (the average value of the distance deviation from the intermediate frequency induction head to...

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Abstract

The invention provides a method for reducing induction quenching deformation of a gear. After a partitioned compensation method induction quenching process is used for heat treatment of the gear, tooth profile and tooth trace deformation has a directional rule, after the induction quenching process is carried out, tooth profile deviation is negative, tooth trace deviation is positive, and measures are conveniently taken to eliminate deformation deviation after heating when the gear is roughly cut before heating. The induction quenching deformation of the gear is reduced, the quality of the gear is improved, the manufacturing cost of the gear is reduced, and the precise heat treatment of the gear is realized. Meanwhile, according to the scheme, the induction quenching deformation amount is small by adopting a partitioned tooth separation compensation method.

Description

technical field [0001] The invention relates to a gear processing method, in particular to a method for reducing gear induction quenching deformation, which belongs to the technical field of gear processing. Background technique [0002] Compared with carburizing and nitriding, induction hardening does not need to heat the entire gear. The heat generated by electromagnetic induction is concentrated on the surface area of ​​the gear, and the tooth surface, dedendum and addendum of the gear teeth can be selectively hardened. The main purpose of gear induction hardening is to obtain a fine-grained martensite layer in a specific part of the gear without affecting other parts of the gear, thereby improving the surface hardness, wear resistance, contact strength and impact strength of the gear. [0003] At present, gear induction hardening generally adopts the single-tooth-by-tooth quenching process, but it will produce more obvious dimensional deformation. The heating position of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D1/10C21D1/18C21D9/32C21D11/00
CPCC21D1/10C21D1/18C21D9/32C21D11/00Y02P10/25
Inventor 晁国强陆堰龙樊洋文超高红梅
Owner CRRC QISHUYAN INSTITUTE CO LTD