A preparation process for nearly round flat steel wire suitable for valve springs

A preparation process and valve spring technology are applied in the field of preparation technology of nearly round flat steel wire, which can solve the problems of undeveloped production and application, and achieve the effect of facilitating subsequent processing and use, reducing brittleness and improving the straightness of the steel wire.

Active Publication Date: 2019-12-27
中钢集团郑州金属制品研究院股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Professor Fuchs invented the valve spring with oval section in 1969, but its production and application did not develop in the following 10 years. It was not until 1983 that the valve spring made of steel wire with oval section was used on Japanese automobile engines. heavily used

Method used

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  • A preparation process for nearly round flat steel wire suitable for valve springs
  • A preparation process for nearly round flat steel wire suitable for valve springs

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The preparation process of the present embodiment comprises the following steps:

[0025] A. Pickling and phosphating: In the pickling and phosphating tank 3, the raw material is SAE9254V and the diameter is φ6.5mm, and the wire rod is subjected to pickling and phosphating in the pickling and phosphating tank 3. The oxide skin on the surface of the wire rod is removed and a dense phosphating coating is obtained.

[0026] B. Round die drawing: the steel wire after pickling and phosphating passes through the inner cavity of the round die 4 for drawing to obtain a regular round steel wire with a diameter of Φ4.32mm.

[0027] C. Quenching and tempering: the drawn round steel wire moves forward at a linear speed of 10m / s, runs through the quenching furnace 5 longitudinally, heats the wire temperature to 900°C, and moves out of the quenching furnace 5 after holding for 10s, then runs through the quenching tank longitudinally 6. Rapidly cooled to 50°C by the 35°C oil quenchin...

Embodiment 2

[0033] The preparation process of the present embodiment comprises the following steps:

[0034] A. Pickling and phosphating: In the pickling and phosphating tank 3, pickling and phosphating the wire rod with a diameter of φ6.5mm and a raw material of 55CrSi after being unfolded by the pay-off device 1 and straightened by the straightening device 2 in sequence. The oxide skin on the surface of the wire rod is removed and a dense phosphating coating is obtained.

[0035] B. Round die drawing: the steel wire after pickling and phosphating passes through the inner cavity of the round die 4 for drawing to obtain a regular round steel wire with a diameter of Φ4.32mm.

[0036] C. Quenching and tempering: the drawn round steel wire moves forward at a linear speed of 10m / s, runs through the quenching heating furnace 5 longitudinally, heats the wire temperature to 920°C, moves out of the quenching heating furnace 5 after holding for 10s, and then runs longitudinally through the quenchi...

Embodiment 3

[0042] The preparation process of the present embodiment comprises the following steps:

[0043] A. Pickling and phosphating: In the pickling and phosphating tank 3, pickling and phosphating the wire rod with a raw material of 55CrSi and a diameter of φ8. The oxide skin on the surface of the wire rod is removed and a dense phosphating coating is obtained.

[0044]B. Round die drawing: The steel wire after pickling and phosphating passes through the inner cavity of the round die 4 for drawing to obtain a regular round steel wire with a diameter of Φ4.95mm.

[0045] C. Quenching and tempering: the drawn round steel wire moves forward at a linear speed of 20m / s, runs through the quenching furnace 5 longitudinally, heats the wire temperature to 910°C, moves out of the quenching furnace 5 after holding for 5s, and then runs through the quenching tank longitudinally 6. Rapidly cooled to 150°C by the 15°C oil quenching medium in the quenching tank 6; the quenched round steel wire ru...

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Abstract

The invention discloses a preparation process of a round flat steel wire suitable for a valve spring, and belongs to the technical field of heat treatment processing of a metal material. The process comprises the following steps: pickling and phosphating, performing round mold drawing, performing quench tempering, collecting a plate, performing rolling molding, destressing and tempering, and packaging and putting in storage. A round steel wire subjected to pickling and phosphating as well as round mold drawing is subjected to process routes of performing quench tempering treatment, performingrolling molding and then destressing and tempering. By the process provided by the invention, the axial torsion of the similar round flat steel wire in the production process can be effectively controlled, and the similar round flat steel wire for the valve spring can be produced and has the advantages of high precision, uniform stress, convenience in processing, high bearing capacity, excellent fatigue resistance and excellent elasticity attenuation resistance; meanwhile, the preparation process has the advantages of simple process, good steel flatness, high precision, low torsion degree, high spring winding finished product rate and the like.

Description

technical field [0001] The invention relates to the technical field of heat treatment processing of metal materials, in particular to a preparation process for nearly round flat steel wires suitable for valve springs. Background technique [0002] With the development of the modern automobile industry, safety, reliability, environmental protection, and energy saving have become the direction of automobile development, and the corresponding automobile engines are also developing in the direction of high speed, high load, low pollution, low energy consumption and light weight. As one of the key parts of the automobile engine, the valve spring has higher and higher requirements, mainly in: (1) excellent load-bearing capacity and fatigue resistance; (2) good ballistic and shock-absorbing performance; ( 3) Lightweight and miniaturized; (4) Multiple varieties and serialization; (5) High cost performance. The key points to improve the performance of valve springs are: material and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D8/06C21D1/18B21C37/04
CPCB21C37/047C21D1/18C21D8/065
Inventor 魏绍康王鹏举秦红权闫远张宇飞郭腾飞
Owner 中钢集团郑州金属制品研究院股份有限公司
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