Machining process for large spring pieces

A processing technology and spring sheet technology, which is applied in the field of large spring sheet processing technology, can solve the problems of not ensuring that no cracking and deformation meet the requirements, and achieve the effect of reducing quenching stress

Inactive Publication Date: 2015-06-03
NANTONG HONGFENG ELECTRO MECHANIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Including quenching, pretreatment and tempering correction, three steps, this method cannot ensure that no cracking and deformation meet the requirements

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A processing technology for a large-scale spring piece, comprising the following steps: blanking of a 3mm plate → stamping → trimming → rough grinding → heat treatment → fine grinding → oxidation treatment → packaging.

[0028] Wherein, the heat treatment includes high temperature tempering, quenching and medium temperature tempering.

[0029] The high-temperature tempering is to perform one high-temperature tempering at 500-600° C. on the roughly ground steel sheet.

[0030] The quenching is heated by an RJX-75-9 box furnace, and after the heat preservation is completed, a 4t quenching press is used to spray oil for cooling. The medium-temperature tempering is carried out in an RJJ-75-6 well-type tempering furnace, and the medium-temperature tempering temperature is 350-380°C.

Embodiment 2

[0032] A processing technology for a large-scale spring piece, comprising the following steps: blanking of a 3mm plate → stamping → trimming → rough grinding → heat treatment → fine grinding → oxidation treatment → packaging.

[0033] Wherein, the heat treatment includes high temperature tempering, quenching and medium temperature tempering.

[0034] The high-temperature tempering is to perform one high-temperature tempering at 500-600° C. on the roughly ground steel sheet.

[0035] The quenching is heated by an RJX-75-9 box furnace, and after the heat preservation is completed, a 4t quenching press is used to spray oil for cooling. The medium-temperature tempering is carried out in an RJJ-75-6 well-type tempering furnace, and the medium-temperature tempering temperature is 4000-450°C.

Embodiment 3

[0037] A processing technology for a large-scale spring piece, comprising the following steps: blanking of a 3mm plate → stamping → trimming → rough grinding → heat treatment → fine grinding → oxidation treatment → packaging.

[0038] Wherein, the heat treatment includes high temperature tempering, quenching and medium temperature tempering.

[0039] The high-temperature tempering is to perform one high-temperature tempering at 500-600° C. on the roughly ground steel sheet.

[0040] The quenching is heated by an RJX-75-9 box furnace, and after the heat preservation is completed, a 4t quenching press is used to spray oil for cooling. The medium-temperature tempering is carried out in an RJJ-75-6 well-type tempering furnace, and the medium-temperature tempering temperature is 350-380°C.

[0041] It also includes the surface nitriding heat treatment process, the nitriding temperature is 460-490°C, and the gas nitriding time is 8-24 hours.

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Abstract

The invention relates to processes for springs, in particular to a machining process for large spring pieces. The machining process includes the following steps of blanking of a 3mm plate, punching, finishing, rough grinding, thermal treatment, accurate grinding, oxidation treatment and packaging, wherein the step of thermal treatment includes high-temperature tempering, quenching and intermediate-temperature tempering. The large spring pieces produced by the machining process are stable in quality, free of saw blade cracking and basically free of workpiece cracking; a shaping die is adopted for tempering, so that uniformity in surface stress is realized, warping of the spring pieces is ensured to be slight, and the machining process is a mature thermal treatment process.

Description

technical field [0001] The invention relates to a spring technology, in particular to a processing technology of a large spring leaf. Background technique [0002] The strength, hardness, elasticity and hardenability of 65Mn steel plate are higher than those of No. 65 steel. It has overheat sensitivity and temper brittleness tendency, and water quenching tends to form cracks. The machinability of the annealed state is acceptable, the cold deformation plasticity is low, and the weldability is poor. Leaf springs subject to medium loads, coil springs with a diameter of 7-20mm and spring washers. Spring rings. High wear resistance parts, such as grinding machine spindles, spring chucks. Precision machine screw. cutter. Collars on helical roller bearings. Railway rails, etc. [0003] Spring steel thin gear parts, the material is 65Mn or other spring steel, with internal or external teeth, the outer diameter is more than 200mm, and the thickness is 1.5-4mm. Spring steel thi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/00C21D9/02C21D1/18C21D7/06
CPCB23P15/00C21D1/18C21D9/02
Inventor 王艳峰
Owner NANTONG HONGFENG ELECTRO MECHANIC
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