JP2510230B2 - Method for manufacturing suspension spring for automobile having excellent high temperature sag - Google Patents

Method for manufacturing suspension spring for automobile having excellent high temperature sag

Info

Publication number
JP2510230B2
JP2510230B2 JP63006797A JP679788A JP2510230B2 JP 2510230 B2 JP2510230 B2 JP 2510230B2 JP 63006797 A JP63006797 A JP 63006797A JP 679788 A JP679788 A JP 679788A JP 2510230 B2 JP2510230 B2 JP 2510230B2
Authority
JP
Japan
Prior art keywords
spring
strain
sag
springs
automobile
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 - Fee Related
Application number
JP63006797A
Other languages
Japanese (ja)
Other versions
JPH01184223A (en
Inventor
司 高田
善郎 子安
Original Assignee
新日本製鐵株式会社
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by 新日本製鐵株式会社 filed Critical 新日本製鐵株式会社
Priority to JP63006797A priority Critical patent/JP2510230B2/en
Publication of JPH01184223A publication Critical patent/JPH01184223A/en
Application granted granted Critical
Publication of JP2510230B2 publication Critical patent/JP2510230B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16FSPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F1/00Springs
    • F16F1/02Springs made of steel or other material having low internal friction; Wound, torsion, leaf, cup, ring or the like springs, the material of the spring not being relevant
    • F16F1/021Springs made of steel or other material having low internal friction; Wound, torsion, leaf, cup, ring or the like springs, the material of the spring not being relevant characterised by their composition, e.g. comprising materials providing for particular spring properties

Description

【発明の詳細な説明】 (産業上の利用分野) 本発明は自動車用懸架ばねとして用いられる高温へた
り性の優れたばね製造法に関するものである。
Description: TECHNICAL FIELD The present invention relates to a spring manufacturing method which is used as a suspension spring for an automobile and which is excellent in high temperature sag.
(従来の技術) 自転車の走行性能や燃費を向上させるために、自動車
車体の軽量化が進められており、自動車の構成部品の一
つであるばねにおいても軽量化、高応力化が要求されて
いる。特に自動車用懸架ばねの高応力化のためには、耐
へたり性の改善が必要である。
(Prior Art) In order to improve the running performance and fuel efficiency of bicycles, the weight of automobile bodies is being reduced, and springs, which are one of the components of automobiles, are also required to be lightweight and highly stressed. There is. Particularly, in order to increase the stress of suspension springs for automobiles, it is necessary to improve the sag resistance.
更に最近では自動車の前輪駆動方式が主流となるな
ど、懸架ばねの使用温度条件は苛酷になってきており、
高温域でのへたり性が重要視され、高温へたり性の優れ
たばねの出現が望まれている。
Furthermore, recently, the front wheel drive system of automobiles has become the mainstream, and the operating temperature conditions of suspension springs have become severe.
Emphasis is given to the sag in the high temperature region, and the emergence of springs with excellent sag is desired.
ここで言う「へたり」とはコイルばねが使用中に永久
変形を起こし、その自由高さが変化する現象であり、こ
の耐へたり性の優れたばねが開発されればばねの使用設
計応力を更に上げることが可能となりその結果ばねの軽
量化を図ることが可能である。
The term "settling" is a phenomenon in which the coil spring undergoes permanent deformation during use and its free height changes. If a spring with excellent sag resistance is developed, the design stress of the spring will be reduced. It is possible to further raise the spring, and as a result, it is possible to reduce the weight of the spring.
ところで、従来自動車の懸架用のばねは、JIS SUP6〜
7に代表されるSi−Mn系及びSAE9254に代表されるSi−C
r系の鋼種あるいは、最近開発されたこれらの鋼種にNb,
V等の合金元素を添加したばね鋼を用いた熱間あるいは
冷間ばねが使用されている(特公昭59−41502号,特公
昭62−37108号の公報)。
By the way, conventional suspension springs for automobiles are JIS SUP6 ~
7 represented by Si-Mn system and SAE9254 represented by Si-C
r-type steel types or these recently developed steel types have Nb,
Hot or cold springs using spring steel to which alloy elements such as V have been added are used (Japanese Patent Publication Nos. 59-41502 and 62-37108).
熱間ばねは上記ばね鋼を熱間でばねに成型後、焼入・
焼戻処理、室温でのセッチング、ショット,塗装工程を
経て製造されている。又冷間ばねは焼入,焼戻処理した
ばね鋼線(いわゆるOT線)を冷間でばねに成型後低温で
の歪取り焼鈍、ショット、セッチング、塗装の工程で作
られている。
Hot springs are formed by quenching the above spring steel into hot springs
It is manufactured through tempering, room temperature setting, shots, and painting processes. A cold spring is made by quenching and tempering a spring steel wire (so-called OT wire) that is cold formed into a spring and then subjected to strain relief annealing at low temperature, shot, setting, and painting.
いずれの工程で作ったばねでも、従来のばね鋼を室温
でのセッチングによる方法で製造したばねでは、へたり
に対する厳しい要求に対して、満足できる結果が得られ
なかったのが現状である。
In any of the springs manufactured by any of the processes, the conventional springs manufactured by the method of setting at room temperature cannot satisfy the strict requirement for fatigue.
(発明が解決しようとする課題) 本発明は上述の如く最近問題となってきた高温でのへ
たり性を改善したばねの製造方法に関するものである。
(Problems to be Solved by the Invention) The present invention relates to a method for manufacturing a spring which has improved the sag property at high temperatures, which has recently become a problem as described above.
(課題を解決するための手段) 本発明者等は上記の問題点を解決するため研究を重ね
発明を成し遂げた。
(Means for Solving the Problems) The present inventors have conducted research to solve the above problems and achieved the invention.
即ち重量%で C:0.40〜0.85 Si:0.10〜1.50 Mn:0.30〜1.50 Cr:0.10〜1.00 Al:0.015未満 N:0.0060〜0.0200 を含み、残りは実質的にFeよりなる鋼を、熱間ばねでは
熱間成型、焼入焼戻後、冷間ばねの場合は焼入焼戻した
鋼線を冷間で成型後、80〜400℃に加熱しその温度域に
おいて、当該ばねに剪断歪で0.005〜0.030のセッチング
歪を与えることを特徴とする高温へたり性の優れた自動
車用懸架ばねの製造方法である。
That is, in wt% C: 0.40 to 0.85 Si: 0.10 to 1.50 Mn: 0.30 to 1.50 Cr: 0.10 to 1.00 Al: less than 0.015 N: 0.0060 to 0.0200 is contained in the steel, and the rest is essentially Fe. Then, after hot forming, quenching and tempering, and in the case of a cold spring, after quenching and tempering the steel wire is cold formed, it is heated to 80 to 400 ° C, and in that temperature range, the spring has a shear strain of 0.005 to A method for manufacturing a suspension spring for an automobile, which is excellent in high temperature sag characteristics, characterized by giving a setting strain of 0.030.
第1図は第1表に示す化学成分を有する直径11mmの線
材を900℃に加熱焼入後種々の温度で焼戻すことにより
硬さを調節した線材を25,100,150℃の温度で剪断歪γで
0.019の捩り歪を与えた後、80℃で練りクリープ試験を
行い96Hr経過後の残留剪断歪量を測定した結果である。
図から明らかなように、鋼を150℃で歪を与えた場
合、現在の標準ばねであるのSUP7鋼を常温(25℃)で
セッチングしたものより、残留剪断歪が小さくへたり性
が優れていることが判る。
Fig. 1 shows a wire rod with the chemical composition shown in Table 1 that has a hardness adjusted by heating and quenching a wire rod with a diameter of 11 mm to 900 ° C and then tempering it at various temperatures with shear strain γ at temperatures of 25, 100 and 150 ° C.
After applying a twisting strain of 0.019, a kneading creep test was performed at 80 ° C. to measure the residual shear strain amount after 96 hours passed.
As can be seen from the figure, when the steel is strained at 150 ° C, the residual shear strain is smaller and the settling property is better than that of SUP7 steel, which is the current standard spring, set at room temperature (25 ° C). It is understood that there is.
本発明者等は、高温でのへたり改善に対するこのよう
な新しい知見をもとに本発明を完成した。
The present inventors have completed the present invention on the basis of such new findings for improvement in fatigue at high temperatures.
(作 用) 以下に本発明で規定している各発明構成因子の作用限
定理由について説明する。
(Operation) The reasons for limiting the action of each of the constituent factors of the invention specified in the present invention will be described below.
Cは材料の焼入性、強度を左右する元素で、0.40%以
下ではばねとして必要な硬さを得ることが出来ない。ま
た0.85%を越えるとばねの靭性が低下して脆くなるため
避けなければならない。
C is an element that influences the hardenability and strength of the material, and if it is 0.40% or less, the hardness required as a spring cannot be obtained. If it exceeds 0.85%, the toughness of the spring will be reduced and it will become brittle, so it must be avoided.
Siは脱酸剤、焼入性の確保、へたり性の向上のため必
要で、0.10%未満では、脱酸剤として不 十分で又1.50%を越えてもへたり向上効果が飽和するの
で上限を1.50%とした。
Si is necessary as a deoxidizing agent, to secure hardenability and to improve sagability. The upper limit was set to 1.50% because the improvement effect saturates even if it exceeds 1.50%.
Mnは脱酸剤として、また焼入性を確保し所定の硬さの
ばねを得るため必要である。0.30%未満では脱酸剤とし
ての効果が十分得られない。1.50%を越えて添加しても
それ以上の効果が得られないので特許請求の範囲から除
いた。
Mn is necessary as a deoxidizer and for ensuring hardenability and for obtaining a spring having a predetermined hardness. If it is less than 0.30%, the effect as a deoxidizer cannot be sufficiently obtained. Even if added over 1.50%, no further effect can be obtained, so it was excluded from the claims.
CrはSiが高い場合出現し易い黒鉛の析出を防止すると
共に、Si,Mnと同じく焼入性を上げ、所定の硬さを得る
ため必要である。このため0.10%以上必要であり、又1.
00%を越えて添加してもそれ以上の効果が得られないた
め特許請求の範囲から除いた。
Cr is necessary to prevent the precipitation of graphite, which tends to appear when Si is high, and to improve the hardenability and obtain a predetermined hardness, like Si and Mn. Therefore, 0.10% or more is required, and 1.
Even if added in excess of 00%, no further effect can be obtained, so it was excluded from the scope of the claims.
Nは80〜400℃でのセッチング歪を有効にばねのへた
り改善に作用させるため必要で、0.0060%以下ではその
効果が不十分で、又0.0200%を越えてもそれ以上の効果
が得られない。
N is necessary to effectively set the setting strain at 80 to 400 ° C. to improve the fatigue of the spring, and if 0.0060% or less, the effect is insufficient, and if 0.0200% or more, more effect can be obtained. Absent.
AlはNと結合してAlNとなり結晶粒微細化に寄与する
が、しかしAlを過度に多くするとこのAlN結合のためへ
たり性の改善に必要な固容Nが減少するのでAl量の上限
を0.015%未満とした。
Al combines with N to become AlN and contributes to grain refinement. However, if the Al content is excessively large, the solid content N necessary for improving the sag property decreases due to the AlN bond, so the upper limit of the Al content is set. It was less than 0.015%.
本発明のもう一つのポイントは、以上の如く化学成分
を制御した鋼をばねに成型後80〜400℃の温度域で所定
の歪を付加することにある。
Another point of the present invention is to apply a predetermined strain in the temperature range of 80 to 400 ° C. after forming the steel in which the chemical composition is controlled as described above into a spring.
歪を与える温度域は80〜400℃の範囲である。ここで8
0℃より低い温度域で歪を加えても、十分なへたりの改
善効果が得られない。又400℃を越えた温度に加熱して
歪を与えてもそれ以上の効果が得られないし、ばねの曲
がり等の問題も生じてくるので避けなければならない。
The temperature range that gives strain is 80 to 400 ° C. Where 8
Even if strain is applied in a temperature range lower than 0 ° C, a sufficient sag-improving effect cannot be obtained. Further, even if it is heated to a temperature over 400 ° C. and strained, no further effect can be obtained, and problems such as bending of the spring will occur, so it must be avoided.
与えるセッチング歪の量は、剪断歪で0.005〜0.030の
範囲の歪である。与える歪の量が0.005より小さい場合
へたり改善効果が十分でない。また0.030を越えて歪を
与えてもそれ以上の効果が得られないし、ばねの形状に
よっては密着してしまうので避けなければならない。
The amount of setting strain to be applied is shear strain in the range of 0.005 to 0.030. If the amount of strain applied is less than 0.005, the effect of improving fatigue is not sufficient. In addition, even if strain exceeds 0.030, no further effect can be obtained, and depending on the shape of the spring it will stick, so it must be avoided.
ばねはいわゆる熱間ばねと冷間ばねと呼ばれる二種類
のばねの製造方法が知られているが、上記の歪を与える
時期は、熱間ばねでは熱間で成型し焼入・焼戻処理した
後であり、冷間ばねでは焼入・焼戻処理した鋼線(いわ
ゆるOT線)を冷間でばねに成型し低温焼鈍した後に付与
する。
Two types of springs are known, the so-called hot springs and cold springs. There are two known methods for manufacturing springs. However, when the strain is applied, the hot springs are hot-molded and then quenched and tempered. Later, in the case of cold springs, steel wires (so-called OT wires) that have been quenched and tempered are cold formed into springs, which are applied after low-temperature annealing.
(実施例) 以下に実施例を挙げて更に本発明を説明する。(Examples) The present invention will be further described below with reference to Examples.
第2表に示す化学成分を有する鋼を溶製し、通常の方
法で直径12.8mmの線材に圧延した。この線材から、線径
12.5mm、コイル平均径140mm、高さ370mmの自動車用の懸
架ばねを熱間で成型し、焼入・焼戻処理でHRC52.5の硬
さに調節した。
Steel having the chemical composition shown in Table 2 was melted and rolled into a wire rod having a diameter of 12.8 mm by a usual method. From this wire, wire diameter
A suspension spring for automobiles with a diameter of 12.5 mm, an average coil diameter of 140 mm, and a height of 370 mm was hot-molded and the hardness was adjusted to H R C52.5 by quenching and tempering.
このばねを第3表に示す条件で剪断歪で0.019のセッ
チングを行った。この後ショット投射、塗装、焼き付け
処理を行ない、懸架ばねとした。
This spring was set to 0.019 by shear strain under the conditions shown in Table 3. After that, shot projection, painting and baking were performed to make a suspension spring.
耐へたり性を評価するため100℃において、試験応力
が115kg/mm2となるような締めつけ試験を96時間を行な
い、その時のへたり量(残留剪断歪)を比較した。その
結果を第3表に示す。
In order to evaluate the sag resistance, a tightening test was performed at 100 ° C. for a test stress of 115 kg / mm 2 for 96 hours, and the sag amount (residual shear strain) at that time was compared. The results are shown in Table 3.
第3表の結果から明らかな如く、本発明方法によるば
ねは、現行のばねに比べ、同等以上のへたり特性を有し
ていることが判る。
As is clear from the results shown in Table 3, the spring according to the method of the present invention has a sag characteristic equal to or higher than that of the existing spring.
(発明の効果) 本発明を実施することにより、従来高価な高合金のば
ね鋼を使って製造していたのに代って、安価な方法でへ
たり性の優れた自動車懸架用のばねを製造することが出
来る。
(Effects of the Invention) By carrying out the present invention, a spring for automobile suspension having an excellent sag property can be provided by an inexpensive method instead of being manufactured using expensive expensive spring alloy steel. It can be manufactured.
【図面の簡単な説明】[Brief description of drawings]
第1図は各セッチング温度における残留剪断歪量を示す
図である。
FIG. 1 is a diagram showing the residual shear strain amount at each setting temperature.
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 FI 技術表示箇所 F16F 1/02 F16F 1/02 B ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 6 Identification code Internal reference number FI Technical display area F16F 1/02 F16F 1/02 B

Claims (1)

    (57)【特許請求の範囲】(57) [Claims]
  1. 【請求項1】重量%で C:0.40〜0.85 Si:0.10〜1.50 Mn:0.30〜1.50 Cr:0.10〜1.00 Al:0.015未満 N:0.0060〜0.0200 を含み、残りはFe及び不可避的不純物からなる鋼を、熱
    間ばねでは熱間成型、焼入焼戻後、冷間ばねの場合は焼
    入焼戻した鋼線を冷間で成型後、80〜400℃に加熱しそ
    の温度域において、当該ばねに剪断歪で0.005〜0.030の
    セッチング歪を与えることを特徴とする高温へたり性の
    優れた自動車用懸架ばねの製造方法
    1. A steel containing C: 0.40 to 0.85 Si: 0.10 to 1.50 Mn: 0.30 to 1.50 Cr: 0.10 to 1.00 Al: less than 0.015 N: 0.0060 to 0.0200 with the balance Fe and unavoidable impurities. In the case of a hot spring, after hot forming and quenching and tempering, and in the case of a cold spring, the quenched and tempered steel wire is cold formed and then heated to 80 to 400 ° C. A method for manufacturing a suspension spring for an automobile having excellent high temperature sag characteristics, characterized by imparting a setting strain of 0.005 to 0.030 by shear strain
JP63006797A 1988-01-18 1988-01-18 Method for manufacturing suspension spring for automobile having excellent high temperature sag Expired - Fee Related JP2510230B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP63006797A JP2510230B2 (en) 1988-01-18 1988-01-18 Method for manufacturing suspension spring for automobile having excellent high temperature sag

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP63006797A JP2510230B2 (en) 1988-01-18 1988-01-18 Method for manufacturing suspension spring for automobile having excellent high temperature sag

Publications (2)

Publication Number Publication Date
JPH01184223A JPH01184223A (en) 1989-07-21
JP2510230B2 true JP2510230B2 (en) 1996-06-26

Family

ID=11648168

Family Applications (1)

Application Number Title Priority Date Filing Date
JP63006797A Expired - Fee Related JP2510230B2 (en) 1988-01-18 1988-01-18 Method for manufacturing suspension spring for automobile having excellent high temperature sag

Country Status (1)

Country Link
JP (1) JP2510230B2 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4558183B2 (en) * 2000-12-14 2010-10-06 中央発條株式会社 Manufacturing method of valve spring
US7789974B2 (en) 2000-12-20 2010-09-07 Nippon Steel Corporation High-strength spring steel wire
JP6208611B2 (en) 2014-03-31 2017-10-04 株式会社神戸製鋼所 High strength steel with excellent fatigue properties
JP6477007B2 (en) * 2015-02-26 2019-03-06 愛知製鋼株式会社 Leaf spring and manufacturing method thereof

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57164928A (en) * 1981-04-01 1982-10-09 Daido Steel Co Ltd Production of steel strip
JPH041056B2 (en) * 1985-12-27 1992-01-09 Aichi Seiko Kk

Also Published As

Publication number Publication date
JPH01184223A (en) 1989-07-21

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