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Equipment and method for induction hardening stepped shaft

An induction heating and quenching device technology, applied in heat treatment furnaces, heat treatment equipment, furnace types, etc., can solve problems such as increased tool loss, decreased fatigue strength, and reduced production efficiency, and achieves increased power output performance, reduced weight, and design diameter Reduced effect

Active Publication Date: 2006-11-01
SHANGHAI GKN DRIVE SYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] C. Considering the quenching and tempering deformation, it is necessary to increase the machining allowance, and the loss of the tool caused by the quenching and tempering hardness is greater than the normalizing hardness, which increases the machining cost;
[0008] D. Induction heating and quenching adopts two clamping, which reduces production efficiency;
[0009] E. The transition position between the large-diameter shaft and the small-diameter shaft is in a quenched and tempered state, and the general hardness will not exceed 35HRC. In the presence of scratches, stress concentration, etc., the fatigue strength will decrease, the service life will be reduced, and it will easily cause instant fatigue fracture

Method used

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  • Equipment and method for induction hardening stepped shaft
  • Equipment and method for induction hardening stepped shaft
  • Equipment and method for induction hardening stepped shaft

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0131] Step shaft diameter: small end 12mm, large end 16mm; material is 45 steel. The depth of the hardened layer is required to be 1.5-2.5mm, and the hardened layer is required to be continuously distributed.

[0132] Selected sensor specifications: inner diameter 20mm, height 1.2cm;

[0133] Select the equipment frequency as 30kHz, select polyalkylene glycol as the quenching medium, control the spraying pressure at 0.15-0.6MPa, the quenching medium temperature at 30-50°C, and the spraying density at 45-60 (10 -6 .m 3 / cm 2 .s);

[0134] Heating and quenching steps:

[0135] Place the inductor at the bottom of the large-diameter shaft, select the output power of the equipment to be 36-43kW, and the moving speed of the sensor to be 5.37mm / s, so that the sensor moves from bottom to top to harden the main part of the surface of the large-diameter shaft. When the sensor moves to one-third of the height of the induction coil to expose the step plane of the step shaft, select ...

Embodiment 2

[0137] Step shaft diameter: small end 30mm, large end 35mm; material is 40Cr steel. The depth of the hardened layer is required to be 3.5-5.5mm, and the hardened layer is required to be continuously distributed.

[0138] Selected sensor specifications: inner diameter 40mm, height 2cm;

[0139] Select the equipment frequency as 5kHz, select polyethyloxazoline as the quenching medium, control the spray pressure at 0.15-0.6MPa, the quenching medium temperature at 30-50°C, and the spray density at 45-60 (10 -6 .m 3 / cm 2 .s);

[0140] Heating and quenching steps:

[0141] Place the inductor at the bottom of the large-diameter shaft, select the output power of the equipment to be 120-142kW, and the moving speed of the sensor to be 6.22mm / s, so that the sensor moves from bottom to top to harden the main part of the surface of the large-diameter shaft. When the sensor moves to one-third of the height of the induction coil to expose the step plane of the step shaft, select the ou...

Embodiment 3

[0143] Step shaft diameter: small end 54mm, large end 64mm; material is 42CrMo steel. The depth of the hardened layer is required to be 6-9mm, and the hardened layer is required to be continuously distributed;

[0144] Selected sensor specifications: inner diameter 70mm, height 2cm;

[0145] Select the equipment frequency as 2kHz, select hot oil as the quenching medium, control the spray pressure to 0.15-0.6MPa, the temperature of the quenching medium to 30-50°C, and the spray density to 45-60 (10 -6 .m 3 / cm 2 .s);

[0146] Heating and quenching steps:

[0147] Place the inductor at the bottom of the large-diameter shaft, the output power of the equipment is 190-228kW, and the moving speed of the sensor is 2.91mm / s, so that the sensor moves from bottom to top to harden the main part of the surface of the large-diameter shaft. When the sensor moves to one-third of the height of the induction coil to expose the step plane of the step shaft, select the output power of the e...

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Abstract

This invention relates to a method and the equipment for quenching stepped shaft heated by induction method. The induction heating quenching equipment is composed of: intermediate frequency induction electric power, simple numerical control quenching press, a transformer, centering device of inductor, electric conducting gang, quick changing device of inductor and the inductor. When proceeding the induction heating quenching the stepped shaft, the inductor moves from bottom to the top, from the large diameter end to the small diameter end of the stepped shaft with altogether 5 steps hardening, two stops at two surfaces (upper / bottom) of step of the stepped shaft. Advantages are: quenching with suitable depth, simple procedure.

Description

technical field [0001] The invention relates to a heat treatment device and method for mechanical parts, in particular to a stepped shaft induction heating and quenching device and method. Background technique [0002] A stepped shaft with certain strength requirements such as figure 1 As shown, it is connected by at least two shafts with different diameters. The processing procedure for such a stepped shaft in the prior art is as follows: [0003] Forging→normalizing→shot blasting→rough turning→quenching and tempering→shot blasting→straightening→finish turning→surface hardening→tempering→grinding. [0004] The surface hardening process is an important process related to the surface hardness and strength of the stepped shaft workpiece, and induction heat treatment is generally used for hardening. in the right figure 1 When part A shown in is hardened, the induction heat treatment method in the prior art is as follows figure 2 As shown, two inductors 11 and 12 are used f...

Claims

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Application Information

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IPC IPC(8): C21D1/10C21D9/28
CPCY02P10/25
Inventor 山华伟
Owner SHANGHAI GKN DRIVE SYST
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