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Cold induction quenching process for single tooth back of large-modulus gear ring

A technology of induction hardening and large modulus, applied in the direction of quenching device, improvement of process efficiency, manufacturing tools, etc., can solve problems such as quenching cracks on tooth surface or tooth root, parts scrapping, etc., to prevent quenching cracks, avoid quenching cracks, Resolve sensitive effects

Inactive Publication Date: 2010-12-15
LUOYANG LYC BEARING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In actual production, due to the improper adjustment of parameters such as the spray angle of the direct cooling sprinkler, the speed of scanning heating, and the concentration of the cooling medium, quenching cracks occur on some tooth surfaces or roots, and eventually the entire part is scrapped.

Method used

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  • Cold induction quenching process for single tooth back of large-modulus gear ring
  • Cold induction quenching process for single tooth back of large-modulus gear ring
  • Cold induction quenching process for single tooth back of large-modulus gear ring

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Embodiment Construction

[0019] Embodiments of the present invention are given in conjunction with the accompanying drawings, but the present invention is not limited to the following embodiments.

[0020] Such as Figure 3-4 As shown, the embodiment of the present invention is that the tooth back cold quenching process of M18 is as follows:

[0021] 1. Adjust the concentration of the quenching medium to 4% to 6%. Since the cooling speed of the back cooling is slow, the lower the concentration of the quenching medium is, the faster the cooling rate will be. Therefore, only by reducing the concentration of the quenching medium to increase the cooling rate can the purpose of quenching be achieved. However, the concentration of quenching medium below 4% will increase the quenching stress, thereby increasing the deformation of the teeth, while the concentration of quenching medium above 6% will make the surface hardness low and the depth of hardened layer will be shallow. Therefore, based on repeated test...

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Abstract

The invention discloses a cold induction quenching process for the single tooth back of a large-modulus gear ring, which comprises the steps of: adjusting the concentration of a quenching medium to 4-6 percent; inputting quenching parameters into a control program according to technological requirements; adjusting the position of a sensing heater: delivering the sensing heater into workpiece teeth, enabling the lower end of the sensing heater to be aligned to the lower end surface of the workpiece teeth part, adjusting the coupling gap between the sensing heater and a teeth root to be 1-2mm, adjusting the gasp between two teeth faces to be consistent, and starting a back cooling sprayer to carrying out spraying cooling on heated workpieces; and electrifying a machine tool to ensure that the sensing heater begins to carry out sensing and heating on the workpiece, wherein quenching temperature is 940-960 DEG C, after the sensing heater is preheated for 6-8 seconds, moving the sensing heater along the tooth width direction of the workpiece at 180mm / min, stopping heating when the sensing heater moves to the other end of the tooth, simultaneously stopping moving the sensing heater, cooling for 20-22 seconds, closing the back cooling sprayer to terminating the quenching process; and rotating the workpiece along a circumferential direction by a tooth position according a preset program, and automatically carrying out heating quen ching on the next tooth by the sensing heater.

Description

technical field [0001] The invention belongs to the technical field of medium-frequency induction hardening heat treatment, and mainly relates to a cold induction hardening process for a single tooth back of a large-modulus ring gear. Background technique [0002] At present, the induction hardening of large modulus (M8~M18) gears (or ring gears) in the heat treatment industry adopts the quenching method of single-tooth scanning heating, and then directly cooling the heating surface. Such as Figure 1-2 Shown: After the machine tool is powered on, the induction heater 3 starts to inductively heat the workpiece. With the movement of the sensor, the direct cooling water sprayer 4 starts to spray liquid to cool the heated workpiece 1. At the same time, the back cooling water spray is turned on. Cooling device 3 is mainly to prevent the quenched tooth surface from annealing due to high temperature until the quenching of one tooth is completed. Due to the method of directly cool...

Claims

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Application Information

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IPC IPC(8): C21D9/32C21D1/10C21D1/667
CPCY02P10/25
Inventor 端木培兰王明礼孙小东尤蕾蕾霍晓磊任芳
Owner LUOYANG LYC BEARING
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