JPH0514771B2 - - Google Patents
Info
- Publication number
- JPH0514771B2 JPH0514771B2 JP61218554A JP21855486A JPH0514771B2 JP H0514771 B2 JPH0514771 B2 JP H0514771B2 JP 61218554 A JP61218554 A JP 61218554A JP 21855486 A JP21855486 A JP 21855486A JP H0514771 B2 JPH0514771 B2 JP H0514771B2
- Authority
- JP
- Japan
- Prior art keywords
- wire
- oxide film
- atmosphere
- oil
- water vapor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 15
- 229910000831 Steel Inorganic materials 0.000 claims description 13
- 239000010959 steel Substances 0.000 claims description 13
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 10
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 10
- 239000007789 gas Substances 0.000 claims description 10
- 238000005496 tempering Methods 0.000 claims description 10
- 230000007935 neutral effect Effects 0.000 claims description 6
- 229910052757 nitrogen Inorganic materials 0.000 claims description 6
- 238000010791 quenching Methods 0.000 claims description 6
- 230000000171 quenching effect Effects 0.000 claims description 6
- 229910052786 argon Inorganic materials 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 238000000034 method Methods 0.000 description 22
- 238000010438 heat treatment Methods 0.000 description 19
- 239000003921 oil Substances 0.000 description 15
- 238000002485 combustion reaction Methods 0.000 description 5
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 229910000669 Chrome steel Inorganic materials 0.000 description 2
- 229910001566 austenite Inorganic materials 0.000 description 2
- QKJXFFMKZPQALO-UHFFFAOYSA-N chromium;iron;methane;silicon Chemical compound C.[Si].[Cr].[Fe] QKJXFFMKZPQALO-UHFFFAOYSA-N 0.000 description 2
- 239000000567 combustion gas Substances 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 238000000227 grinding Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 238000005491 wire drawing Methods 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000004320 controlled atmosphere Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010291 electrical method Methods 0.000 description 1
Description
（産業上の利用分野）
この発明は、各種のバネ用に使用されるバネ成
形性の良い酸化皮膜を有するオイルテンパー線の
製造方法に関するものである。
（従来技術）
オイルテンパー線は冷間で曲げ加工やねじり加
工によりコイルバネに成形され、弁バネ用等に使
用されることが多い。
このバネの成形（コイリング加工）は線とコイ
リング用の工具との間に強い摩擦を伴う塑性加工
であり、このため線と工具との間の摩擦係数が大
きいか、または不安定であると焼付きが起り、バ
ネに疵が生じたり、バネの自由長にバラツキが生
じたりすることになり、また高速での生産ができ
ず、生産性が低下したりすることになる。この問
題はとくに高強度の素材を用いる際に顕著とな
る。
このため冷間成形して用いるオイルテンパー線
では線の潤滑性が重視され、線表面の薄い酸化皮
膜はこの潤滑性に大きく寄与することが知られて
おり、線の長さ方向、円周方向ともに均一で安定
した酸化皮膜を有することが望まれる。
オイルテンパー線の製造は、ガスもしくは石油
系の燃料と空気との比率を調整した燃焼炉で線を
加熱し、オーステナイト化するのが一般的である
が、この方法では炉中における線温、加熱時間、
雰囲気ガス組成（CO、CO2、H2O、等）の変動
の影響を受けやすく、酸化皮膜の厚さにバラツキ
が生じたり、局部的に酸化皮膜が剥落して皮膜が
存在しない部分が生じたりする。したがつてこの
ようなオイルテンパー線では上記のような摩擦係
数が不安定となる問題があつた。
コイリング性の良い鋼線を得る方法として、特
開昭58−130226号公報では、鋼線を水蒸気中で
300〜570℃温度で加熱し、少なくとも2μm以上の
均一な厚さをもつマグネタイト層を形成させてコ
イリング加工性を向上させる方法が提案されてい
る。しかしながら、この方法では最終段階で鋼線
に皮膜形成の処理を行うため、熱処理工程が一工
程付加されることとなり、コストアツプとなるこ
と、また少なくとも2μmのマグネタイト層を得る
ためには、500℃で20分程度の処理が必要となる
ため、この処理により鋼線の特性に変化が生じ、
引張強さが低下する等の問題があつた。
（発明の目的）
この発明はこのような従来の欠点を解消するた
めになされたものであり、各種のバネに使用され
るバネ成形性の良い酸化皮膜を安定して有するオ
イルテンパー線の製造方法を提供するものであ
る。
（発明の構成）
この発明は、オーステナイト域に加熱した鋼線
を、５％以上の水蒸気を含む窒素もしくはアルゴ
ン等の中性ガス雰囲気中を通過させることにより
線材表面に6g／m2〜30g／m2の酸化皮膜を形成さ
せた後、焼入れ、焼戻しを行うようにしたもので
ある。
上記方法により、線材の表面に均一で安定した
酸化皮膜が形成され、加工性の優れたオイルテン
パー線が得られる。
（実施例）
この発明は、オーステナイト域に加熱された鋼
線の表面に水蒸気雰囲気中もしくは５％以上の水
蒸気を含む窒素もしくはアルゴン等の中性ガス雰
囲気中で6g／m2〜30g／m2の酸化皮膜を形成させ
た後、焼入れ、焼戻しを行なうものであり、この
加熱オーステナイト化は燃焼ガス以外の制御され
た雰囲気中で加熱する。この加熱雰囲気として
は、以下のようなものが採用可能である。すなわ
ち、
(A) 放射管を用いて間接的に炉内雰囲気を加熱す
る方式、
(B) 燃焼型加熱炉中にパイプを載置し、ワイヤを
パイプを介して間接的に加熱する方式、
(C) ワイヤを直接通電もしくは高周波加熱のよう
な電気的な方法により加熱する方式、
がある。
また上記雰囲気としては、水蒸気雰囲気もしく
は５％以上の水蒸気を含む窒素もしくはアルゴン
等の中性ガス雰囲気とし、この雰囲気ガス中で線
表面に6g／m2〜20g／m2の酸化皮膜を生成させた
後、通常のように焼入れ、焼戻しを行うことによ
りコイリングやフオーミング加工の際の潤滑性に
優れたオイルテンパー線を得る。
実施例 １
シリコンクロム鋼の線材に表面研削、熱処理、
伸線加工を施し、直径4.0mmの鋼線とした。上記
シリコンクロム鋼としては、SAE9254（Ｃ：0.58、
Si：1.45、Mn：0.69、Cr：0.68）を用いた。上記
伸線加工を行つた鋼線を、第１図に示すような高
周波加熱方式を採用したオイルテンパー炉を用い
てオイルテンパー処理した。すなわち、同図にお
いて線材１をペイオフ２から繰出し、高周波加熱
を利用した加熱手段３によりオーステナイト化温
度まで加熱して保持炉４中に送り込む。この保持
炉４中は、水蒸気もしくは５％以上の水蒸気を含
む窒素もしくはアルゴン等の中性ガスが供給され
た雰囲気に保持されており、この保持炉４中を通
過することによつて線材１の表面に酸化皮膜を形
成させる。ついで焼入れ油槽５を通して焼入れ
し、高周波加熱を利用した加熱手段６、焼戻し用
保持炉７および水冷槽８を通すことによつて焼戻
しを行つた後、巻取り機９に巻取る。
上記オイルテンパー処理におけるオーステナイ
ト化保持炉４の雰囲気は第１表に示すように調整
した。
(Industrial Application Field) The present invention relates to a method for manufacturing an oil tempered wire having an oxide film with good spring formability and used for various springs. (Prior Art) Oil tempered wire is formed into a coil spring by cold bending or twisting, and is often used for valve springs and the like. This spring forming (coiling process) is a plastic process that involves strong friction between the wire and the coiling tool, so if the coefficient of friction between the wire and the tool is large or unstable, it will result in burnout. This may cause flaws in the spring or variations in the free length of the spring, and high-speed production may not be possible, resulting in a decrease in productivity. This problem becomes particularly noticeable when using high-strength materials. For this reason, the lubricity of the oil-tempered wire used by cold forming is important, and it is known that the thin oxide film on the wire surface greatly contributes to this lubricity. It is desirable that both have a uniform and stable oxide film. In the production of oil-tempered wire, the wire is generally heated in a combustion furnace with an adjusted ratio of gas or oil-based fuel and air to austenite. time,
It is easily affected by changes in the atmospheric gas composition (CO, CO 2 , H 2 O, etc.), resulting in variations in the thickness of the oxide film, or in areas where the oxide film peels off locally and has no film. or Therefore, such oil-tempered wires have the problem of unstable friction coefficient as described above. As a method for obtaining a steel wire with good coiling properties, Japanese Patent Application Laid-open No. 130226/1983 discloses that steel wire is soaked in steam.
A method has been proposed to improve coiling processability by heating at a temperature of 300 to 570°C to form a magnetite layer with a uniform thickness of at least 2 μm or more. However, in this method, a coating is formed on the steel wire at the final stage, which adds one heat treatment step, which increases costs.In addition, in order to obtain a magnetite layer of at least 2 μm, it is necessary to heat the wire at 500°C. Because the treatment takes about 20 minutes, this treatment causes changes in the properties of the steel wire.
There were problems such as a decrease in tensile strength. (Object of the Invention) This invention was made to eliminate such conventional drawbacks, and provides a method for producing an oil tempered wire that stably has an oxide film with good spring formability and is used for various springs. It provides: (Structure of the Invention) The present invention is characterized by passing a steel wire heated to an austenitic region through a neutral gas atmosphere such as nitrogen or argon containing 5% or more of water vapor, so that the surface of the wire is coated with 6 g/m2 to 30 g/ m2 . After forming an oxide film of m2 , quenching and tempering are performed. By the above method, a uniform and stable oxide film is formed on the surface of the wire, and an oil tempered wire with excellent workability can be obtained. (Example) The present invention provides a method of applying 6 g/m 2 to 30 g/m 2 on the surface of a steel wire heated to an austenite region in a water vapor atmosphere or in a neutral gas atmosphere such as nitrogen or argon containing 5% or more water vapor. After forming an oxide film, quenching and tempering are performed, and this heating austenitization is performed in a controlled atmosphere other than combustion gas. As this heating atmosphere, the following can be adopted. In other words, (A) a method in which the atmosphere inside the furnace is indirectly heated using a radiant tube, (B) a method in which a pipe is placed in a combustion-type heating furnace and the wire is indirectly heated through the pipe, ( C) There is a method of heating the wire using an electrical method such as direct current or high-frequency heating. In addition, the above-mentioned atmosphere is a water vapor atmosphere or a neutral gas atmosphere such as nitrogen or argon containing 5% or more water vapor, and an oxide film of 6 g/m 2 to 20 g/m 2 is generated on the wire surface in this atmospheric gas. After that, the wire is quenched and tempered in the usual manner to obtain an oil-tempered wire that has excellent lubricity during coiling and forming processes. Example 1 Surface grinding, heat treatment,
The wire was drawn into a steel wire with a diameter of 4.0 mm. The silicon chrome steel mentioned above is SAE9254 (C: 0.58,
Si: 1.45, Mn: 0.69, Cr: 0.68) were used. The steel wire subjected to the wire drawing process was subjected to oil tempering using an oil tempering furnace employing a high frequency heating method as shown in FIG. That is, in the figure, a wire 1 is fed out from a payoff 2, heated to an austenitizing temperature by a heating means 3 using high frequency heating, and fed into a holding furnace 4. The holding furnace 4 is maintained in an atmosphere supplied with water vapor or a neutral gas such as nitrogen or argon containing 5% or more water vapor. Forms an oxide film on the surface. Then, the material is quenched through a quenching oil tank 5, tempered by passing through a heating means 6 using high-frequency heating, a tempering holding furnace 7, and a water cooling tank 8, and then wound up on a winder 9. The atmosphere of the austenitizing holding furnace 4 in the oil tempering treatment was adjusted as shown in Table 1.
【表】
上記表において、Fe3O4はマグネタイトを示
す。
試料番号１は酸化皮膜が生成せず、試料番号２
は大気雰囲気であり、スケールが厚く生成し、か
つ密着性が悪いために一部剥離し、外観の均一性
もよくない。試料番号６、７は通常の燃焼ガス雰
囲気中の加熱であるが、空燃比等のコントロール
により燃焼制御は行つているが、温度の維持のた
めの燃焼量の変動等もあつて実質的な加熱雰囲気
が変動し、生成する酸化皮膜の皮膜組成、皮膜
量、密着性、均一性等にバラツキがあり、コイリ
ング加工の際の潤滑性は必ずしも満足すべきもの
ではない。
試料番号４、５がこの発明の方法によるもので
ある。この方法によるものでは、炉外から所定の
比率の水蒸気および中性ガスを供給することによ
り雰囲気が調整されるものであるから、常に一定
の雰囲気に保たれ、常に安定してバラツキの小さ
い酸化皮膜が得られる。
また第１表で作成した各種のワイヤ（直径4.0
mm）をＤ／ｄ（バネ径：線径比）＝7.0、コイル巻
数51／４巻、自由長60mmのバネに成形した結果は
第２表に示す通りである。[Table] In the above table, Fe 3 O 4 indicates magnetite. Sample number 1 did not generate an oxide film, sample number 2
is an atmospheric environment, the scale is thick, and due to poor adhesion, some parts peel off, and the appearance is not uniform. Samples Nos. 6 and 7 are heated in a normal combustion gas atmosphere. Although combustion is controlled by controlling the air-fuel ratio, etc., there are fluctuations in the amount of combustion to maintain the temperature, so there is no actual heating. The atmosphere fluctuates, and the film composition, film amount, adhesion, uniformity, etc. of the formed oxide film vary, and the lubricity during coiling processing is not necessarily satisfactory. Sample numbers 4 and 5 were obtained by the method of this invention. In this method, the atmosphere is adjusted by supplying water vapor and neutral gas at a predetermined ratio from outside the furnace, so a constant atmosphere is always maintained and an oxide film is always stable and with small variations. is obtained. In addition, various wires (diameter 4.0
Table 2 shows the results of forming a spring with a D/d (spring diameter: wire diameter ratio) of 7.0, a coil winding number of 51/4, and a free length of 60 mm.
【表】【table】
【表】
上記表に示すように、この発明の方法によるも
のは、従来法の酸化皮膜の均一性の良いものと同
等の優れた加工性を有している。一方、試料番号
１〜７のうち４、５以外のものでは、試料番号７
が皮膜の密着性、均等性は最も良いが、この試料
番号７のものでも10000個のコイリングですでに
最大3μのすり疵が発生し、さらにコイリングの
続行は可能であるが、限界に近い状態となる。
実施例 ２
シリコンクロム鋼の線材に表面研削、熱処理、
伸線加工を施し、直径4.0mmの鋼線とした。上記
シリコンクロム鋼としては、SAE9254（Ｃ：0.58、
Si：1.45、Mn：0.69、Cr：0.68）を用いた。上記
伸線加工を行つた鋼線を、燃焼型加熱炉中にパイ
プを載置し、ワイヤをパイプを介して間接的に加
熱する方式を採用したオイルテンパー炉を用いて
オイルテンパー処理した。
燃焼型加熱炉中に載置されたパイプ中は、５％
H2Oと95％N2の混合ガス雰囲気とされ、このパ
イプ中で線は常温より180秒間加熱され、油焼入
後、鉛浴中で焼戻された。この時のオーステナイ
ト化の加熱炉温度は850℃である。
このようにして得られたオイルテンパー線はマ
グネタイトを主成分とした酸化皮膜を有し、酸化
皮膜量は18g／m2であり、全長にわたり均一であ
る。
このワイヤをＤ／ｄ（バネ径／線径比）＝7.0、
コイル巻線53／４、自由長60mmのバネに成形した
ところ、10000個のコイリング後のバネの表面状
況は最大1.5μの工具すり疵であり、コイリングの
続行が可能で充分なコイリング加工性を示した。
なお、この酸化皮膜の量は上記コイリングの結
果では6g／m2以上であると、コイリング加工時
の工具摩耗や、焼付きの発生等の問題が減少した
ので、6g／m2以上であることが必要である。一
方、30g／m2を越えると、コイリング加工時に皮
膜が多量に剥離して機械を汚染することになり、
また皮膜生成による材料の損失も増加することに
なり、経済的ではない。したがつて、30g／m2以
下であることが望ましい。
なお、このように酸化皮膜の重量を調整するの
は、この発明の方法では雰囲気中の水蒸気量、雰
囲気温度および線温、雰囲気中での保持時間等を
選択することにより可能である。第２図はこのこ
とを例示するもので、オーステナイト化温度880
℃における雰囲気中、水蒸気量と酸化皮膜量を示
し、曲線１１は保持時間が100秒、曲線１２は保
持時間が20秒の場合の特性を示している。6g／
m2の酸化皮膜を得るには、保持時間の長さにもよ
るが、実用的処理条件下では５％以上の水蒸気含
有量が必要である。
（発明の効果）
以上説明したように、この発明によれば鋼線の
強度の低下はなく、生産性の優れた方法で鋼線の
表面に均一で安定した酸化皮膜が形成され、加工
性の優れたオイルテンパー線が得られるものであ
る。[Table] As shown in the table above, the method of the present invention has excellent workability equivalent to that of the conventional method with good uniformity of the oxide film. On the other hand, for samples other than 4 and 5 among sample numbers 1 to 7, sample number 7
The adhesion and uniformity of the film is the best, but even with sample number 7, scratches of up to 3μ have already occurred after 10,000 coilings, and although it is possible to continue coiling, the situation is close to the limit. becomes. Example 2 Surface grinding, heat treatment,
The wire was drawn into a steel wire with a diameter of 4.0 mm. The silicon chrome steel mentioned above is SAE9254 (C: 0.58,
Si: 1.45, Mn: 0.69, Cr: 0.68) were used. The steel wire subjected to the wire drawing process was subjected to oil tempering using an oil tempering furnace in which a pipe was placed in a combustion type heating furnace and the wire was indirectly heated through the pipe. 5% in pipes placed in combustion type heating furnaces.
A mixed gas atmosphere of H 2 O and 95% N 2 was used, and the wire was heated in this pipe from room temperature for 180 seconds, and after oil quenching, it was tempered in a lead bath. The heating furnace temperature for austenitization at this time was 850°C. The oil tempered wire thus obtained has an oxide film mainly composed of magnetite, and the amount of the oxide film is 18 g/m 2 and is uniform over the entire length. D/d (spring diameter/wire diameter ratio) = 7.0,
When formed into a spring with a coil winding of 53/4 and a free length of 60mm, the surface condition of the spring after 10,000 coilings was a maximum of 1.5μ tool scratches, making it possible to continue coiling and ensuring sufficient coiling workability. Indicated. The amount of this oxide film should be 6 g/m 2 or more, because according to the above coiling results, problems such as tool wear and seizure during coiling were reduced when it was 6 g/m 2 or more. is necessary. On the other hand, if it exceeds 30g/ m2 , a large amount of the film will peel off during the coiling process, contaminating the machine.
Moreover, the loss of material due to film formation also increases, which is not economical. Therefore, it is desirable that it be 30 g/m 2 or less. In the method of the present invention, the weight of the oxide film can be adjusted in this manner by selecting the amount of water vapor in the atmosphere, the ambient temperature and line temperature, the holding time in the atmosphere, etc. Figure 2 illustrates this, with an austenitizing temperature of 880
The amount of water vapor and the amount of oxide film are shown in an atmosphere at a temperature of 0.degree. C., and curve 11 shows the characteristics when the holding time is 100 seconds, and curve 12 shows the characteristics when the holding time is 20 seconds. 6g/
To obtain an oxide film of m 2 , a water vapor content of 5% or more is required under practical processing conditions, depending on the length of holding time. (Effects of the Invention) As explained above, according to the present invention, there is no reduction in the strength of the steel wire, and a uniform and stable oxide film is formed on the surface of the steel wire using a method with excellent productivity, resulting in improved workability. Excellent oil tempered wire can be obtained.
第１図はこの発明の実施例を示す工程説明図、
第２図は雰囲気中の水蒸気量等と皮膜重量との関
係図である。
１……線材、３，６……高周波を利用した加熱
手段、４……オーステナイト化用保持炉、５……
焼入れ油槽、７……焼戻し用保持炉、８……水冷
槽。
FIG. 1 is a process explanatory diagram showing an embodiment of this invention;
FIG. 2 is a diagram showing the relationship between the amount of water vapor in the atmosphere and the weight of the film. 1... Wire rod, 3, 6... Heating means using high frequency, 4... Holding furnace for austenitization, 5...
Quenching oil tank, 7... Tempering holding furnace, 8... Water cooling tank.
Claims (1)
上の水蒸気を含む窒素もしくはアルゴン等の中性
ガス雰囲気中を通過させることにより線材表面に
6g／m2〜30g／m2の酸化皮膜を形成させた後、焼
入れ、焼戻しを行なうことを特徴とする成形性の
良い酸化皮膜を有するオイルテンパー線の製造方
法。1 A steel wire heated to an austenitic region is passed through a neutral gas atmosphere such as nitrogen or argon containing 5% or more water vapor to change the surface of the wire.
A method for producing an oil tempered wire having an oxide film with good formability, which comprises forming an oxide film of 6 g/m 2 to 30 g/m 2 and then quenching and tempering.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21855486A JPS6372832A (en) | 1986-09-16 | 1986-09-16 | Production of oil tempered wire having oxide film of good formability |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21855486A JPS6372832A (en) | 1986-09-16 | 1986-09-16 | Production of oil tempered wire having oxide film of good formability |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6372832A JPS6372832A (en) | 1988-04-02 |
| JPH0514771B2 true JPH0514771B2 (en) | 1993-02-25 |
Family
ID=16721757
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21855486A Granted JPS6372832A (en) | 1986-09-16 | 1986-09-16 | Production of oil tempered wire having oxide film of good formability |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6372832A (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002004836A2 (en) * | 2000-07-11 | 2002-01-17 | Seiko Epson Corporation | Spring, drive mechanism, device and timepiece using the spring |
| JP3555892B2 (en) | 2002-07-22 | 2004-08-18 | 鈴木金属工業株式会社 | Method of manufacturing oil-tempered wire |
| JP4116383B2 (en) * | 2002-09-25 | 2008-07-09 | 住友電工スチールワイヤー株式会社 | Oil temper wire for valve spring or spring and manufacturing method thereof |
| US7284461B2 (en) * | 2004-12-16 | 2007-10-23 | The Gillette Company | Colored razor blades |
| JP6085192B2 (en) * | 2013-03-01 | 2017-02-22 | 株式会社神戸製鋼所 | Steel wire for springs excellent in drawability and manufacturing method thereof |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58130226A (en) * | 1982-01-29 | 1983-08-03 | Sumitomo Electric Ind Ltd | Manufacture of steel wire which is excellent in spring workability |
-
1986
- 1986-09-16 JP JP21855486A patent/JPS6372832A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58130226A (en) * | 1982-01-29 | 1983-08-03 | Sumitomo Electric Ind Ltd | Manufacture of steel wire which is excellent in spring workability |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6372832A (en) | 1988-04-02 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |