JPH0791585B2 - Coil spring manufacturing method - Google Patents
Coil spring manufacturing methodInfo
- Publication number
- JPH0791585B2 JPH0791585B2 JP60059890A JP5989085A JPH0791585B2 JP H0791585 B2 JPH0791585 B2 JP H0791585B2 JP 60059890 A JP60059890 A JP 60059890A JP 5989085 A JP5989085 A JP 5989085A JP H0791585 B2 JPH0791585 B2 JP H0791585B2
- Authority
- JP
- Japan
- Prior art keywords
- quenching
- coil spring
- coiling
- coil
- pattern
- 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
- 238000004519 manufacturing process Methods 0.000 title claims description 11
- 239000000463 material Substances 0.000 claims description 31
- 238000010791 quenching Methods 0.000 claims description 29
- 230000000171 quenching effect Effects 0.000 claims description 29
- 238000005496 tempering Methods 0.000 claims description 15
- 238000010438 heat treatment Methods 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 10
- 229910000831 Steel Inorganic materials 0.000 claims description 8
- 229910000734 martensite Inorganic materials 0.000 claims description 8
- 239000010959 steel Substances 0.000 claims description 8
- 230000009466 transformation Effects 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 5
- 238000000137 annealing Methods 0.000 claims description 3
- 230000035882 stress Effects 0.000 description 22
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 5
- 229910052799 carbon Inorganic materials 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 230000007423 decrease Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000002436 steel type Substances 0.000 description 3
- 229910000639 Spring steel Inorganic materials 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 102220358403 c.89C>G Human genes 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000005480 shot peening Methods 0.000 description 1
- 230000000930 thermomechanical effect Effects 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
- C21D9/525—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length for wire, for rods
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Springs (AREA)
- Wire Processing (AREA)
- Heat Treatment Of Steel (AREA)
- Heat Treatment Of Articles (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、耐疲労性に優れ長寿命のコイルばねを得るこ
とのできるコイルばねの製造方法に関する。Description: TECHNICAL FIELD The present invention relates to a method for manufacturing a coil spring which is excellent in fatigue resistance and can provide a long-life coil spring.
従来一般に行なわれているコイルばねの製造方法は、ば
ね鋼をコイリングしたのち焼入れ、焼戻しを行なうもの
であって、高強度化させる一手段として焼戻し温度を低
くして低温焼戻しを行なうことが知られている。しかし
この場合、焼戻し温度の低下に伴ってばね鋼の靱性が低
下するという問題がある。A conventional coil spring manufacturing method is one in which coil steel is coiled, then quenched and tempered, and it is known that low tempering is carried out by lowering the tempering temperature as one means for increasing strength. ing. However, in this case, there is a problem that the toughness of the spring steel decreases as the tempering temperature decreases.
また高強度化させる別の手段として、析出強化元素を含
んだ新鋼種の開発も行なわれているが、この場合材料コ
ストがかなり高くなり、一般向きでない。Further, as another means for increasing the strength, a new steel grade containing a precipitation strengthening element is also being developed, but in this case, the material cost becomes considerably high and it is not suitable for general use.
そこで本発明者らは高強度化を図るための有力な方法と
して、加工熱処理の応用、すなわち焼戻し温間コイリン
グを応用したコイルばねの製造方法を提案し、例えば特
願昭57−90360号（特開昭58−207324号）あるいは特願
昭56−125124号（特開昭58−27927号）として出願され
ている。これらの製造方法によれば、焼戻された鋼が焼
戻し温度で温間加工される際に高延展性を示すため加工
性に優れ加工限界の向上を図れるばかりでなく、動的ひ
ずみ時効等により、加工後の室温での強度および室温で
の残留延性などに優れ、鋼の強化法として大きな効果が
期待できる。Therefore, the inventors of the present invention have proposed a method of manufacturing a coil spring, which is an application of thermomechanical treatment, that is, tempering warm coiling, as a promising method for achieving high strength. For example, Japanese Patent Application No. 57-90360 Application is made as Japanese Patent Application Laid-Open No. 58-207324) or Japanese Patent Application No. 56-125124 (Japanese Patent Application Laid-Open No. 58-27927). According to these manufacturing methods, the tempered steel exhibits high ductility when warm-worked at the tempering temperature, so that not only the workability is excellent and the working limit can be improved, but also due to the dynamic strain aging and the like. In addition, the strength at room temperature after processing and the residual ductility at room temperature are excellent, and great effects can be expected as a strengthening method for steel.
しかし前述の公知技術を始めとして、従来の焼戻し温間
コイリングは、コイルばね素材を鋼材の芯部まで焼入れ
を行ない、すなわち完全焼入れしたのち、焼戻しつつコ
イリングを行なう方法が採用されている。コイリング
は、コイルばね素材に曲げとねじりを付加しつつ成形を
行なうから、加工後のスプリングバックの影響を受け
て、コイルの外面側つまり曲げ外側の端部（以下、コイ
ル外端と呼ぶ）では圧縮残留応力が、またコイルの内面
側つまりの曲げ内側の端部（以下、コイル内端と呼ぶ）
には引張り残留応力が生じる。例えば線径が9mm,平均コ
イル径Ｄが90mm（D/d＝10）のコイルばねの残留応力を
測定すると、コイル外端では−65.8Kgf/mm2、またコイ
ル内端では＋62.8Kgf/mm2の残留応力が生じている。However, in the conventional tempering warm coiling including the above-mentioned known technique, a method of quenching the coil spring material to the core of the steel material, that is, completely quenching and then performing coiling while tempering is adopted. Since coiling is performed while adding bending and twisting to the coil spring material, it is affected by the spring back after processing, and the coil outer surface side, that is, the outer end of the coil (hereinafter referred to as the coil outer end) is affected. The compressive residual stress is also the inner surface side of the coil, that is, the end portion inside the bend (hereinafter referred to as the coil inner end).
Causes tensile residual stress. For example, when measuring the residual stress of a coil spring with a wire diameter of 9 mm and an average coil diameter D of 90 mm (D / d = 10), the outer end of the coil is -65.8 Kgf / mm 2 , and the inner end of the coil is +62.8 Kgf / mm. There are 2 residual stresses.
上記のようにコイル内端側に大きな引張り応力が生じて
いると、圧縮荷重が作用したときに疲労破壊の起点とな
り易く、耐疲労性に悪影響を与える。従って本発明の目
的は、コイリング後に発生するコイル内側の引張り残留
応力を抑制することにより、コイルばねの疲労強度等を
向上させることができるような製造方法を提供すること
にある。When a large tensile stress is generated on the inner end side of the coil as described above, it becomes a starting point of fatigue fracture when a compressive load is applied, which adversely affects fatigue resistance. Therefore, an object of the present invention is to provide a manufacturing method capable of improving the fatigue strength and the like of a coil spring by suppressing the tensile residual stress inside the coil that occurs after coiling.
本発明は、直棒状の鋼からなるコイルばね素材を焼入れ
したのちコイリングを行なうコイルばねの製造方法にお
いて、上記焼入れは、上記素材の表面側のみが焼入れマ
ルテンサイトにより硬化してその変態歪による表面圧縮
残留応力が素材全周に生じるような加熱温度および冷却
速度で急速加熱および急冷することによりパターン焼入
れを行ない、上記パターン焼入れによる硬化深さを素材
表面から素材中心までの距離の40％を越えて75％までと
し、上記パターン焼入れを行ったのち上記素材をコイリ
ング可能な250℃ないし600℃の温度に再加熱するととも
に、この温度域で焼戻しを行ないながら温間コイリング
を行ない、そののち冷却することを特徴とするコイルば
ねの製造方法である。The present invention is a method for manufacturing a coil spring in which a coil spring material made of a straight rod-shaped steel is quenched and then coiled, wherein the quenching is performed by quenching martensite only on the surface side of the material and the surface due to its transformation strain. Pattern quenching is performed by rapid heating and quenching at a heating temperature and cooling rate that causes compressive residual stress to occur all around the material, and the hardening depth due to the above pattern quenching exceeds 40% of the distance from the material surface to the material center. Up to 75%, after the above pattern quenching, the above material is reheated to a temperature of 250 ° C to 600 ° C at which coiling is possible, and warm coiling is performed while tempering in this temperature range and then cooling. It is a method for manufacturing a coil spring.
本発明でパターン焼入れとは、完全焼入れに対して、ば
ね素材の芯部までは焼入れを行なわない熱処理、すなわ
ち不完全焼入れを言う。ここで焼入れされた状態とは、
金属組織が50％以上マルテンサイト化した状態であり、
このとき金属組織の硬さは含有炭素量に応じてほぼ一定
の値を示す。一例として、0.6C％の鋼の焼入れ後のロッ
クウェル硬さはおよそHRC45である。従って芯部がこの
硬さ以下となるように焼入れを行なう。なお炭素含有量
が減少すれば、焼入れ硬さの下限は上記の例よりも下が
る。In the present invention, pattern hardening refers to heat treatment in which hardening is not performed up to the core of the spring material, that is, incomplete hardening, as opposed to complete hardening. What is hardened here is
The metallic structure is in the martensite state of 50% or more,
At this time, the hardness of the metal structure shows a substantially constant value according to the carbon content. As an example, the Rockwell hardness after quenching of 0.6 C% steel is approximately H R C45. Therefore, quenching is performed so that the hardness of the core is less than this hardness. If the carbon content is reduced, the lower limit of quenching hardness will be lower than in the above example.
上記の如くパターン焼入れされた直棒状のばね素材に
は、変態歪による表面圧縮残留応力を生じる。このた
め、焼戻し温間コイリングすることにより生じるコイル
内端側の引張り残留応力を大幅に低減ないし解消でき、
疲労破壊の起点となることを防止できる。In the straight bar-shaped spring material pattern-quenched as described above, surface compression residual stress is generated due to transformation strain. Therefore, it is possible to significantly reduce or eliminate the tensile residual stress on the inner end side of the coil caused by the warm tempering coiling,
It can be prevented from becoming the starting point of fatigue fracture.
しかも温間コイリングを行なうため、焼入れした状態の
ものを折損させることなく大きな加工度を与えることが
でき、かつ深い圧縮残留応力を生じさせることができ、
寿命向上と耐へたり性の向上に大きな効果を発揮する。Moreover, since warm coiling is performed, a large workability can be provided without breaking the quenched one, and deep compressive residual stress can be generated.
It has a great effect on the improvement of life and sag resistance.
0.6C％相当のばね鋼鋼材（JIS.G4801参照）からなるコ
イルばね素材、すなわち直棒状のSUP材を、高周波誘導
加熱または高周波抵抗加熱により、所定の焼入れ温度ま
で急速加熱したのち、急冷することによりパターン焼入
れを行なう。高周波加熱は、ばね素材を軸線方向に移動
させつつ連続的に行なわれる。但しばね素材を固定した
まま、他の加熱手段により焼入れ温度まで加熱すること
も可能である。Coil spring material consisting of spring steel material equivalent to 0.6 C% (see JIS.G4801), that is, straight rod-shaped SUP material, is rapidly heated to the specified quenching temperature by high frequency induction heating or high frequency resistance heating, and then rapidly cooled. Pattern hardening by. The high frequency heating is continuously performed while moving the spring material in the axial direction. However, it is also possible to heat to the quenching temperature by another heating means while fixing the spring material.
第１図は、パターン焼入れされたコイルばね素材の断面
を模式的に示したものである。0.6C％の場合、焼入れ硬
さ（HRＣ）は約45ないし60である。焼入れされた層１の
外表面は、HRC60以上のマルテンサイト（１相）となる
が、芯部２に近付くほどマルテンサイトは減少し、芯部
２では低炭素マルテンサイト＋トルースタイト（２相）
となる。焼入れ状態ではマルテンサイトが50％以上あ
り、焼入れ硬さの下限はHRC45位である（0.6C％の場
合）。FIG. 1 schematically shows a cross section of a pattern-quenched coil spring material. For 0.6 C%, quenching hardness (H R C) is 60 to about 45 to. The outer surface of the hardened layer 1 becomes martensite (1 phase) of H R C60 or more, but martensite decreases as it gets closer to the core 2, and in the core 2, low carbon martensite + troostite (2 phase)
Becomes The hardened state has martensite is 50% or more, the lower limit of the quenching hardness is H R C45 position (for 0.6 C%).
そして焼入れによる硬化深さが50ないし75％となるよう
に焼入れ温度および冷却速度等を鋼種との関連で設定す
る。Then, the quenching temperature, cooling rate, etc. are set in relation to the steel type so that the hardening depth by quenching is 50 to 75%.
硬化深さは、第２図において焼入れ硬さに達している深
さをｒ、ばね素材の中心までの距離をＲとした時に、
（r/R）×100％で表わされる。なお炭素含有量の少ない
鋼種（例えば0.3C％）を用いた場合には、焼入れ硬さの
限界はHRC45よりも小さくなる。As for the hardening depth, when the depth reaching the quenching hardness is r and the distance to the center of the spring material is R in Fig. 2,
It is expressed as (r / R) x 100%. Note that when using a carbon content less steel type (e.g. 0.3 C%) is the limit of the quenching hardness is smaller than H R C45.
以上のパターン焼入れを行ない、表面側がマルテンサイ
ト組織になると、変態歪による表面圧縮残留応力が生
じ、第３図に２点鎖線Ａで示されるような残留応力分布
となる。When the above-described pattern quenching is performed and the surface side has a martensitic structure, surface compressive residual stress due to transformation strain occurs, and the residual stress distribution as shown by a chain double-dashed line A in FIG. 3 is obtained.
次に、上記パターン焼入れの行なわれた直棒状のコイル
ばね素材を250℃ないし600℃の温度に再加熱して焼戻す
とともに、この焼戻し温度域で温間コイリングを実施す
る。焼戻しの加熱には高周波誘導加熱あるいは高周波抵
抗加熱を用いるのが好ましい。Next, the straight bar-shaped coil spring material subjected to the pattern quenching is reheated to a temperature of 250 ° C. to 600 ° C. to be tempered, and warm coiling is performed in this tempering temperature range. High-frequency induction heating or high-frequency resistance heating is preferably used for heating for tempering.
以上の焼戻し温間コイリングを行なった場合、従来の完
全焼入れ材では、第３図に破線Ｂで示されるようにコイ
ル外端側に圧縮残留応力が、またコイル内端側には引張
り残留応力が生じる。しかして本実施例では、パターン
焼入れにより予めコイル内端側に圧縮残留応力を生じせ
しめているので、第３図に実線Ｃで示されるように、温
間コイリング時にコイル内端側に引張りの残留応力が生
じることを軽減、ないし解消することができる。When the above tempering warm coiling is performed, in the conventional completely quenched material, as shown by the broken line B in FIG. 3, compressive residual stress is generated on the coil outer end side and tensile residual stress is generated on the coil inner end side. Occurs. However, in this embodiment, since the compressive residual stress is generated in advance on the inner end side of the coil by pattern hardening, as shown by the solid line C in FIG. 3, the residual tensile force remains on the inner end side of the coil during warm coiling. It is possible to reduce or eliminate the occurrence of stress.
以上の温間コイリングを行なったのち、必要に応じて低
温焼鈍を実施する。焼鈍の温度は例えば180℃、時間は4
0分前後である。After performing the above warm coiling, low temperature annealing is performed as needed. Annealing temperature is 180 ℃, time is 4
It is around 0 minutes.
その後、通常のコイルばねと同様にショットピーニング
を付加すれば、更に耐疲労性の向上が期待できる。ま
た、必要に応じてセッチング、防錆処理等を行なっても
よい。After that, if shot peening is added as in the case of a normal coil spring, further improvement in fatigue resistance can be expected. Further, setting, rustproofing treatment, etc. may be carried out if necessary.
以上説明した本実施例によれば、焼入れ時の変態歪によ
る表面圧縮残留応力を利用することにより、疲労破壊の
起点となるコイル内端側の引張り残留応力の発生を押
え、耐疲労性を向上できる。しかも焼戻しを行ないなが
ら温間コイリングを行なうことにより、温間加工性がよ
く、しかも高強度のばねが得られる。そして温間コイリ
ングの温度条件（低温側）を適宜に選定することで深い
残留応力を生じさせることができる。According to the present embodiment described above, by utilizing the surface compressive residual stress due to transformation strain during quenching, the occurrence of tensile residual stress on the inner end side of the coil, which is the starting point of fatigue fracture, is suppressed, and fatigue resistance is improved. it can. Moreover, by performing warm coiling while tempering, a spring having good warm workability and high strength can be obtained. A deep residual stress can be generated by appropriately selecting the temperature condition (low temperature side) of the warm coiling.
なお、パターン焼入れによる硬化深さが40％以下では、
断面内部より疲労変形を生じる。また75％以上では、疲
労破壊の危険断面が表面近傍に近付き、力学的に破壊し
易くなる。従って硬化深さは40ないし75％の範囲が好ま
しく、この範囲内において、目的とする材料強度に応じ
て調整すればよい。If the hardening depth due to pattern hardening is 40% or less,
Fatigue deformation occurs from inside the cross section. On the other hand, if it is 75% or more, the dangerous cross section of fatigue fracture approaches the vicinity of the surface, and it becomes easy to mechanically fracture. Therefore, the curing depth is preferably in the range of 40 to 75%, and within this range, it may be adjusted according to the intended material strength.
また本発明の対象鋼種は、炭素量を低下させたS30Cクラ
ス（0.3C％）程度でも適用可能である。Further, the target steel type of the present invention can be applied even in the S30C class (0.3 C%) level in which the carbon content is reduced.
上述したように本発明によれば、前述のパターン焼入れ
によって得られる変態歪による表面圧縮残留応力を素材
表面全周に与えた状態で焼戻し中に温間コイリングを行
なうことにより、疲労破壊の起点になりやすいコイル内
側の引張り残留応力がコイリング後に発生することを抑
制でき、しかも加工性に優れ、寿命向上と耐へたり性の
向上に大きな効果を発揮できる。As described above, according to the present invention, by performing warm coiling during tempering in a state where the surface compression residual stress due to the transformation strain obtained by the above-described pattern quenching is applied to the entire surface of the material, the starting point of fatigue fracture is obtained. It is possible to suppress the occurrence of tensile residual stress inside the coil that tends to occur after coiling, and it is also excellent in workability, and it is possible to exert a great effect in improving the life and the sag resistance.
第１図はパターン焼入れ材の断面を模式的に示す図、第
２図はパターン焼入れ材の焼入れ硬化深さを示す図、第
３図は残留応力の分布を示す図である。FIG. 1 is a diagram schematically showing a cross section of a pattern-quenched material, FIG. 2 is a diagram showing a quench-hardening depth of the pattern-quenched material, and FIG. 3 is a diagram showing distribution of residual stress.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 東野 豊之 神奈川県横浜市磯子区新磯子町１番地 株 式会社日発グループ中央研究所内 (72)発明者 綾田 倫彦 神奈川県横浜市磯子区新磯子町１番地 株 式会社日発グループ中央研究所内 (56)参考文献 特開 昭58−207324（ＪＰ，Ａ) 特開 昭58−27927（ＪＰ，Ａ) 特開 昭54−142113（ＪＰ，Ａ) ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Toyoyuki Higashi, Toyoyuki Higashi, No. 1, Shinisogo-cho, Isogo-ku, Yokohama, Kanagawa Prefecture Central Research Institute of Nikka Group Co., Ltd. (72) Norihiko Ayada, Isogo-ku, Yokohama, Kanagawa Machi No. 1 Incorporated company Nikka Group Central Research Institute (56) Reference JP-A-58-207324 (JP, A) JP-A-58-27927 (JP, A) JP-A-54-142113 (JP, A)
Claims (2)
れしたのちコイリングを行なうコイルばねの製造方法に
おいて、上記焼入れは、上記素材の表面側のみが焼入れ
マルテンサイトにより硬化してその変態歪による表面圧
縮残留応力が素材全周に生じるような加熱温度および冷
却速度で急速加熱および急冷することによりパターン焼
入れを行ない、上記パターン焼入れによる硬化深さを素
材表面から素材中心までの距離の40％を越えて75％まで
とし、上記パターン焼入れを行ったのち上記素材をコイ
リング可能な250℃ないし600℃の温度に再加熱するとと
もに、この温度域で焼戻しを行ないながら温間コイリン
グを行ない、そののち冷却することを特徴とするコイル
ばねの製造方法。1. A method for manufacturing a coil spring, comprising quenching a coil spring material made of straight bar steel and then coiling the material. In the quenching, only the surface side of the material is hardened by quenching martensite, and the transformation strain is caused. Pattern quenching is performed by rapid heating and quenching at a heating temperature and cooling rate that causes surface compressive residual stress to occur all around the material, and the hardening depth due to the above pattern quenching is 40% of the distance from the material surface to the center of the material. After the pattern hardening, the material is reheated to a temperature of 250 ° C to 600 ° C at which coiling is possible, and warm coiling is performed while tempering in this temperature range, and then cooling. A method for manufacturing a coil spring, comprising:
ことを特徴とする特許請求の範囲第１項記載のコイルば
ねの製造方法。2. The method for manufacturing a coil spring according to claim 1, wherein low temperature annealing is performed after the warm coiling.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60059890A JPH0791585B2 (en) | 1985-03-25 | 1985-03-25 | Coil spring manufacturing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60059890A JPH0791585B2 (en) | 1985-03-25 | 1985-03-25 | Coil spring manufacturing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61217525A JPS61217525A (en) | 1986-09-27 |
| JPH0791585B2 true JPH0791585B2 (en) | 1995-10-04 |
Family
ID=13126162
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60059890A Expired - Lifetime JPH0791585B2 (en) | 1985-03-25 | 1985-03-25 | Coil spring manufacturing method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0791585B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014141831A1 (en) | 2013-03-12 | 2014-09-18 | 本田技研工業株式会社 | Steel wire for spring and method for manufacturing same |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111774822B (en) * | 2020-08-13 | 2024-06-11 | 无锡金峰园弹簧制造有限公司 | Processing technology of hot coil spring mandrel |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5913568B2 (en) * | 1978-04-28 | 1984-03-30 | 高周波熱錬株式会社 | Manufacturing method for cold-formed coil springs |
| JPS5827927A (en) * | 1981-08-10 | 1983-02-18 | Nhk Spring Co Ltd | Production of coil spring |
| JPS58207324A (en) * | 1982-05-27 | 1983-12-02 | Nhk Spring Co Ltd | Manufacture of high strength coil spring |
-
1985
- 1985-03-25 JP JP60059890A patent/JPH0791585B2/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014141831A1 (en) | 2013-03-12 | 2014-09-18 | 本田技研工業株式会社 | Steel wire for spring and method for manufacturing same |
| EP3409809A1 (en) | 2013-03-12 | 2018-12-05 | Honda Motor Co., Ltd. | Steel wire for spring and method for manufacturing same |
| US10294540B2 (en) | 2013-03-12 | 2019-05-21 | Honda Motor Co., Ltd. | Steel wire for spring and method for manufacturing same |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61217525A (en) | 1986-09-27 |
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