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Oil tempered steel wire excellent in coiling workability and method for production thereof

An oil tempering, steel wire technology, applied in the plating of superimposed layers, metal material coating process, coating and other directions, can solve the problems of uneven spring diameter or free length, harmful spring defects, shortened tool life and other problems

Active Publication Date: 2006-03-08
SHINKO WIRE +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] (1) Insufficient lubricity between winding tools such as winding pins or guides and the surface of the metal wire may cause seizure, resulting in shortened tool life
Therefore, it is necessary to stop the machine operation and perform tool exchange or repair, etc., resulting in a decrease in productivity
[0016] (2) If seizing occurs, the diameter or free length (spring length when there is no load) of the spring as a product will be uneven, resulting in poor product accuracy and a decrease in product yield
[0017] (3) In addition, such burning will produce linear harmful flaws on the surface of the spring, which will have a bad influence on the life of the spring

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0045] High-strength oil-tempered steel wires for valve springs of various steel types shown in Table 1 below were produced by usual quenching and tempering treatments. At this time, on the surface of each oil-tempered steel wire, an oxide film having the same thickness as the conventional one was formed (Table 2 to be described later). In addition, at this time, wire rods having elliptical cross-sectional shapes and circular wire rods were manufactured, and the tensile strength thereof was also measured.

[0046] steel

kind

Chemical composition (mass%)

exam preparation

C

Si

mn

P

S

Cu

Ni

Cr

V

A

B

C

0.54

0.63

0.59

1.43

1.44

2.00

0.69

0.62

0.89

0.013

0.011

0.012

0.008

0.010

0.009

0.01

0.01

0.01

-

-

0.26

0.71

0.67

0.99

-

0.092

0.095

Silicon chrome steel

Hig...

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Abstract

An oil tempered steel wire, characterized in that it comprises a wire material and, formed on the surface thereof, a coating film comprising one or more inorganic salts selected from the group consisting of a sulfate, a silicate and a borate. The coating film optionally further comprises fats and oils and / or a soap exhibiting lubricity. The oil tempered steel wire has a coating film exhibiting satisfactory heat resistance and good lubricity and thus can secure good coiling workability even in the case of a high strength wire or a wire having a heteromorphic section.

Description

technical field [0001] The present invention relates to an oil-tempered steel wire used as a raw material for a valve spring or a bridge spring of an internal combustion engine, and particularly relates to a method for greatly improving the lubricity between a material and a tool in spring processing, thereby improving spring productivity and spring precision Manufacturing method of oil tempered steel wire. Background technique [0002] Wire rods used as raw materials for the above-mentioned various springs are generally processed by quenching and tempering heat treatment called oil tempering after wire drawing. However, since the wire rod produced in this way needs to be formed into a spring by winding, good lubricity between the spring and the processing tool is very important for improving productivity in the above-mentioned processing. [0003] As techniques for improving lubricity during coiling of an oil-tempered steel wire, there have been many methods, and the follo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/00C23C26/00B21C37/04C23C22/62C23C28/00C23C30/00
CPCY10T428/2913C23C22/62C23C30/00B21C37/04C23C28/00
Inventor 藤原忠义神保铁男山本文男
Owner SHINKO WIRE
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