Induction heat treatment method for camshaft end piece

A technology of induction heat treatment and camshaft, applied in heat treatment furnace, heat treatment equipment, improvement of process efficiency, etc., can solve the problems of reduced production efficiency, difficult to harden uniformly on both sides, difficult to harden uniformly, etc., to reduce friction and heat treatment. The effect of reducing energy consumption and improving overall stiffness

Inactive Publication Date: 2018-11-16
上海上大热处理有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is difficult to ensure uniform hardening on both sides with conventionally designed inductors and fixtures. For example, one-sided quenching will reduce production efficiency by 50%, and it is also difficult to ensure uniform hardening in the middle and outside

Method used

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  • Induction heat treatment method for camshaft end piece
  • Induction heat treatment method for camshaft end piece

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The material is 42CrMoS 4 Camshaft end piece notch (if attached figure 1 shown) for induction heat treatment, the specific process is: set the induction coil of the induction heating device with a magnetic field concentration device outside the notch of the camshaft end piece, heat for 1.9s at a DC voltage of 160V and a DC current of 85A, and then Use a polyethylene glycol aqueous solution with a temperature of 20°C and a mass fraction of 5% as a quenching medium to cool for 1.0s, immerse in the antirust agent for 3min, place it in a tempering furnace, keep it at 310°C for 2h for tempering, and air cool.

[0026] After testing, the microhardness tester tested that the surface hardness of the notch of the camshaft end piece after the above heat treatment can reach 480HV1, the distance from the surface is 0.10mm≥370HV1, and the depth of the hardened layer is 410HV1=0.5mm, 340HV1≥0.2mm. The metallographic structure of the notch of the end piece tested by the metallographi...

Embodiment 2

[0028] The material is 42CrMoS 4 The notch of the camshaft end piece is subjected to induction heat treatment, and the specific process is: the induction coil of the induction heating device with a magnetic field concentration device is placed outside the notch of the camshaft end piece, and heated at a DC voltage of 220V and a DC current of 145A 2.5s, and then use polyethylene glycol aqueous solution with a temperature of 40°C and a mass fraction of 12% as a quenching medium to cool for 2.5s, then immerse in the antirust agent for 5min, then place it in a tempering furnace, and keep it at 330°C for 2h. Temper and air cool.

[0029] After testing, the microhardness tester tested that the surface hardness of the notch of the camshaft end piece after the above heat treatment can reach 560HV1, the distance from the surface is 0.10mm≥370HV1, and the depth of the hardened layer is 410HV1=2.5mm, 340HV1≥0.2mm. The metallographic structure of the notch of the end piece tested by the ...

Embodiment 3

[0031] The material is 42CrMoS 4 Induction heat treatment for the notch of the camshaft end piece: use an induction heating device with a magnetic field concentration device to induction harden and temper the notch of the camshaft end piece. The specific process is: set the induction coil of the induction heating device on the camshaft The outside of the notch of the end piece is heated for 2.2s at a DC voltage of 190V and a DC current of 115A, then cooled for 1.5s with a polyethylene glycol aqueous solution at a temperature of 30°C and a mass fraction of 8% as a quenching medium, and then immersed in an antirust Put it in the tempering furnace after soaking in the agent for 4 minutes, heat it at 320°C for 2 hours for tempering, and air-cool.

[0032] After testing, the microhardness tester tested that the surface hardness of the notch of the camshaft end piece after the above heat treatment can reach 520HV1, the distance from the surface is 0.10mm≥370HV1, and the depth of the...

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Abstract

The invention discloses an induction heat treatment method for a camshaft end piece. An induction heating apparatus with a magnetic field concentrating device is adopted to inductively quench and temper the notch and the outer circle of the camshaft end piece. The method includes the following steps: sleeving the induction coil of the induction heating device outside the notch and the outer circleof the camshaft end piece, performing heating under a certain direct-current voltage and a direct current, cooling the end piece by a quenching medium, keeping the temperature at a certain value to carry out tempering, and performing air cooling. The induction heat treatment method for the camshaft end piece improves the overall rigidity of the camshaft, reduces friction, makes the camshaft end piece withstand a high valve impact load, reduces the heat treatment energy consumption by 30%, makes the surface hardness and the hardened layer depth meet technical requirements of the product, and achieves the purposes of energy saving, emission reduction and consumption reduction.

Description

technical field [0001] The invention belongs to the technical field of material heat treatment, and relates to an induction heat treatment method for a camshaft end piece, in particular to an induction heat treatment method for a notch and an outer circle of a camshaft end piece. Background technique [0002] The assembled camshaft is a new type of internal combustion engine part developed in the past 20 years, which adapts to the development trend of lightweight, high performance, low emission and low cost in the automotive industry. At present, more and more automobile manufacturers in the world use assembled camshafts on high-performance engines, and the improvement of its production technology has important practical significance for promoting the continuous development of my country's automobile industry. [0003] Compared with the traditional camshaft, the assembled camshaft has the following technical advantages: (1) Flexible design, flexible production and agile manu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/30C21D1/18C21D1/10C21D1/60
CPCC21D1/10C21D1/18C21D1/60C21D9/30C21D2221/01Y02P10/25
Inventor 许建芳崔青云唐乾胤杨文俊
Owner 上海上大热处理有限公司
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