JPS6159380B2 - - Google Patents
Info
- Publication number
- JPS6159380B2 JPS6159380B2 JP57165691A JP16569182A JPS6159380B2 JP S6159380 B2 JPS6159380 B2 JP S6159380B2 JP 57165691 A JP57165691 A JP 57165691A JP 16569182 A JP16569182 A JP 16569182A JP S6159380 B2 JPS6159380 B2 JP S6159380B2
- Authority
- JP
- Japan
- Prior art keywords
- steel wire
- processing
- strength
- strain
- spring steel
- 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
Links
- 229910000831 Steel Inorganic materials 0.000 claims description 18
- 239000010959 steel Substances 0.000 claims description 18
- 229910000639 Spring steel Inorganic materials 0.000 claims description 12
- 238000005496 tempering Methods 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 10
- 238000005452 bending Methods 0.000 claims description 9
- 238000004519 manufacturing process Methods 0.000 claims description 8
- 229910052799 carbon Inorganic materials 0.000 claims description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 description 14
- 238000010791 quenching Methods 0.000 description 5
- 230000000171 quenching effect Effects 0.000 description 5
- 238000001816 cooling Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000007665 sagging Methods 0.000 description 3
- 239000000725 suspension Substances 0.000 description 3
- 238000011282 treatment Methods 0.000 description 3
- 230000006698 induction Effects 0.000 description 2
- 238000003672 processing method Methods 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 239000002436 steel type Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000005482 strain hardening Methods 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
- 238000004804 winding Methods 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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Steel (AREA)
Description
【発明の詳細な説明】
(イ) 技術分野
本発明は車両用懸架ばね等に用いられる耐へた
性の優れたばね用鋼線の製造法に関するものであ
る。DETAILED DESCRIPTION OF THE INVENTION (a) Technical Field The present invention relates to a method for manufacturing a spring steel wire with excellent fatigue resistance for use in suspension springs for vehicles and the like.
(ロ) 技術の背景
車両用懸架ばね用鋼線には耐へたり性、レラク
ゼーシヨン値等が問題にされる。ここで「へた
り」とはコイルばねが使用中に永久変形を起し、
その自由高さが変化する現象である。(b) Technical Background There are issues with steel wires for vehicle suspension springs, such as fatigue resistance and relaxation value. Here, ``settling'' refers to permanent deformation of the coil spring during use.
This is a phenomenon in which the free height changes.
従来、この様なばね用鋼線にはJISSUP6〜７及
びSAE9254等の鋼種の鋼線が使用されているが
省エネルギーのための車輛の軽量化が要求されて
おり、その１つとして耐へたり性の優れたばね用
鋼線が要望されている。即ち、耐へたり性の優れ
たばね用鋼線が開発出来れば、設計応力を更に上
げることが可能になりその結果コイルばねの軽量
化を計ることが出来る。 Conventionally, steel wires of JISSUP6~7 and SAE9254 have been used for such spring steel wires, but there is a need to reduce the weight of vehicles to save energy, and one of these is to improve fatigue resistance. There is a demand for a steel wire for springs with excellent properties. That is, if a spring steel wire with excellent resistance to fatigue could be developed, it would be possible to further increase the design stress, and as a result, the weight of the coil spring could be reduced.
この耐へたり性の向上のために従来種々の熱処
理による高強度化が試みられているが、むやみに
強度を高くすると高強度化のために逆に伸びや絞
り等の靭性が不足するという問題がある。又高強
度化により鋼線表面の微細な庇や内部欠陥に対す
る感受性が高くなり、ばね加工中や使用中に折損
し易い等信頼性に欠けるという実用上の問題があ
つた。 In order to improve this resistance to sagging, attempts have been made to increase the strength through various heat treatments, but if the strength is increased unnecessarily, the problem is that the increased strength results in a lack of toughness such as elongation and drawing. There is. In addition, increasing the strength of the steel wire increases its sensitivity to minute eaves and internal defects on the surface of the steel wire, leading to practical problems such as a lack of reliability such as easy breakage during spring processing or use.
本発明者らは、強度を上げることなく耐へたり
性に優れたばね用鋼線を得る目的で種々検討を行
つた結果、その目的を達することに成功したもの
である。 The inventors of the present invention have conducted various studies aimed at obtaining a spring steel wire with excellent resistance to fatigue without increasing the strength, and as a result, they have succeeded in achieving their objective.
(ハ) 発明の開示
本発明の特徴は、焼入れ、焼戻し処理を施して
製造されるばね用鋼線の製造法において、上記焼
戻し処理を行つている過程で、曲げ歪量１％以上
３％以下の曲げ加工を加えることを特徴とする耐
へたり性の優れたばね用鋼線の製造方法である。(C) Disclosure of the Invention The feature of the present invention is that in a method for manufacturing a spring steel wire that is manufactured by subjecting it to quenching and tempering treatment, the amount of bending strain is 1% or more and 3% or less during the tempering process. This is a method for manufacturing spring steel wire with excellent resistance to fatigue, which is characterized by adding bending processing.
本発明のばね用鋼線は次のようにして製造され
る。第１図はその工程を示す模式図である。サプ
ライ１から供給された線材２は送り用ピンチロー
〓〓〓〓
ラー３で矢印方向に送られ、矯正機４でほゞ直線
状に矯正された後、第２の送りピンチローラ５で
加熱装置６に送られる。こゝで線材は当該鋼品の
鋼種によつて定まる焼入温度に加熱され、冷却槽
７で冷却されて焼入れ処理が完了する。 The spring steel wire of the present invention is manufactured as follows. FIG. 1 is a schematic diagram showing the process. The wire rod 2 supplied from the supply 1 is used as a feeding pinch row.
The sheet is fed in the direction of the arrow by the roller 3, straightened into a substantially straight line by the straightener 4, and then sent to the heating device 6 by the second feed pinch roller 5. Here, the wire rod is heated to a quenching temperature determined by the steel type of the steel product, and is cooled in a cooling bath 7 to complete the quenching process.
しかる後第３の送り用ピンチローラ８によつて
鋼線はたゞちに加熱装置１０に送られ所要の強度
になるように焼戻温度に加熱される。本発明の特
徴はこの加熱装置１０による加熱中に伸直ロール
等１１によつて曲げ加工しつつ焼戻しを行い、そ
の後直ちに冷却槽１２によつて常温まで冷却さ
れ、送り用ピンチローラ１３によつて巻取り機１
４に巻き取られる。 Thereafter, the steel wire is immediately sent to the heating device 10 by the third feeding pinch roller 8 and heated to a tempering temperature to obtain the required strength. The feature of the present invention is that during heating by this heating device 10, tempering is performed while being bent by a straightening roll or the like 11, and then immediately cooled to room temperature by a cooling tank 12, and then by a feeding pinch roller 13. Winder 1
It is wound up in 4.
このようにして製造された鋼線１５は耐へたり
性が著しく向上したばね用鋼線であることが判明
した。上記において加熱装置６及び１０は加熱速
度を大とする必要がある場合には１ケ又は複数の
誘導加熱コイルを設けても良く、また本願発明の
特徴である焼戻加工装置１１の加工装置として
は、縦横両方向から押え込むものやいずれかの一
方向からのみ押込むような伸直ロール又は回転伸
直ロール等があるがこれ以外の曲げ加工を加える
ことのできる装置でもよい。 It has been found that the steel wire 15 manufactured in this manner is a spring steel wire with significantly improved resistance to sagging. In the above, the heating devices 6 and 10 may be provided with one or more induction heating coils if it is necessary to increase the heating rate, and the heating devices 6 and 10 may be provided with one or more induction heating coils. Although there are devices that press from both the vertical and horizontal directions, straight rolls that press from only one direction, or rotating straight rolls that press from only one direction, other devices that can perform bending processes may also be used.
上記焼戻加工装置９は、第１図では焼戻加熱後
に加工装置１１があるが、加熱―加工―加熱の如
く処理しても本発明の鋼線は得られる。 Although the tempering processing apparatus 9 has a processing apparatus 11 after tempering and heating in FIG. 1, the steel wire of the present invention can be obtained even if the processing is performed by heating-processing-heating.
こゝで加工方法及び加工量によつては当該鋼線
に加工硬化が生じ強度が著しく大となるので、鋼
種、加工方法及び加工量によつて所定の強度が得
られるように熱処理条件を適当に決めなければな
らない。 Depending on the processing method and amount of processing, the steel wire may undergo work hardening and its strength will significantly increase, so the heat treatment conditions must be adjusted appropriately to obtain the specified strength depending on the steel type, processing method, and amount of processing. have to decide.
ここで、曲げ加工により付与する歪量を１％以
上３％以下としたのは、歪量が１％未満では第２
図及び第３図より明らかなように、へたり現象を
抑制する為に必要な歪量に対し不十分であり、ま
た、３％より大きな歪を加えるためには、非常に
大きな動力を必要とし装置上実施が困難なためで
ある。 Here, the reason why the amount of strain imparted by bending is set to 1% or more and 3% or less is that when the amount of strain is less than 1%, it is
As is clear from Fig. 3 and Fig. 3, the amount of strain required to suppress the sagging phenomenon is insufficient, and in order to apply a strain greater than 3%, extremely large power is required. This is because it is difficult to implement on the equipment.
さらに、炭素量を0.5〜0.7％と限定した理由は
以下の通りである。 Furthermore, the reason why the carbon content is limited to 0.5 to 0.7% is as follows.
炭素は、ばね用鋼線に強度を付与するに必要な
成分である。強度が高い程耐へたり性に優れてい
る傾向にあり、耐へたり性向上を目的とする高強
度化に際しては0.5％未満では、十分な強度が得
られず、又0.7％以上では靭性が低下するので炭
素量を0.5〜0.7％とした。 Carbon is a necessary component to impart strength to spring steel wire. The higher the strength, the better the fatigue resistance tends to be. If the content is less than 0.5%, sufficient strength will not be obtained, and if the content is less than 0.7%, the toughness will be poor. Therefore, the carbon content was set at 0.5 to 0.7%.
次に実施例よつて説明する。 Next, an example will be explained.
(ニ) 発明を実施するための最良の形態
実施例 １
供試材としてSAE9254（Ｃ：0.56wt％、Ｓi：
1.37wt％、Ｍo：0.7wt％、Ｃr：0.59wt％）を用
い、加工装置１１として縦横両方向から押込む伸
直ロールを用い種々の加工歪み与らながら焼戻処
理を行つた。この時の焼入れ温度は970℃、焼戻
温度は435℃、また鋼線の最大曲げ歪量が0.4％、
1.2％、2.1％であり、加工後の線径は9.5mφ、加
工後の鋼線の引張強度は200Kg／mm2であつた。こ
の鋼線についてまずその機械的特性を調べた。そ
の引張試験の結果を第２図に示す。(d) Best Mode for Carrying Out the Invention Example 1 SAE9254 (C: 0.56wt%, Si :
1.37 wt%, Mo : 0.7 wt%, C r : 0.59 wt%), and using a straight roll that pushes in from both vertical and horizontal directions as the processing device 11, the tempering treatment was performed while applying various processing strains. The quenching temperature at this time was 970℃, the tempering temperature was 435℃, and the maximum bending strain of the steel wire was 0.4%.
1.2% and 2.1%, the wire diameter after processing was 9.5 mφ, and the tensile strength of the steel wire after processing was 200 Kg/mm 2 . First, we investigated the mechanical properties of this steel wire. The results of the tensile test are shown in FIG.
図でわかる如く、最大曲げ歪量の増加により、
伸び、絞りの靭性は殆んど変化しないが、σ0.2
は著しく上昇している。σmaxはこれに対し殆ん
ど変化しない。 As can be seen in the figure, due to the increase in the maximum bending strain,
Although elongation and drawing toughness hardly change, σ0.2
has increased significantly. In contrast, σmax hardly changes.
次にこの鋼線からコイルばねに加工して静的試
験により耐へたり試験を行つた。比較のために、
9.5mφのSAE9254及びSUP7の通常の焼入れ、焼
戻し処理（加工無し）を行い引張強度185Kg／mm2
になるようにした鋼線で同じ諸元のコイルばねを
作製した。 Next, this steel wire was fabricated into a coil spring, and a static test was conducted to test its resistance to fatigue. For comparison,
9.5mφ SAE9254 and SUP7 are subjected to normal quenching and tempering treatment (no processing) and have a tensile strength of 185Kg/mm 2
A coil spring with the same specifications was made using steel wire that was made to have the following properties.
コイルばねの諸元は次の通りである。 The specifications of the coil spring are as follows.
線径： 9.5mmφ
コイル平均径： 60mmφ
自由高さ： 260mm
有効巻数： 4.25
総巻数： 6.25
これを用いて応力120Kg／mm2でセツチングを施
した後、試験応力が115Kg／mm2となるように一定
荷重を100時間連続的に負荷し、常温におけるへ
たり試験を行つた結果を第３図に示す。Wire diameter: 9.5mmφ Coil average diameter: 60mmφ Free height: 260mm Effective number of turns: 4.25 Total number of turns: 6.25 After setting with a stress of 120Kg/mm 2 using this, set the test stress to 115Kg/mm 2 Figure 3 shows the results of a settling test at room temperature under which a constant load was applied continuously for 100 hours.
第３図は横軸が最大曲げ歪量、縦軸が残留剪断
歪みであり、歪量が多くなる程残留剪断歪は著し
く小さくなり耐へたり性が向上することがわか
る。 In FIG. 3, the horizontal axis is the maximum amount of bending strain, and the vertical axis is the residual shear strain, and it can be seen that as the amount of strain increases, the residual shear strain becomes significantly smaller and the fatigue resistance improves.
以上の実施例からも明らかなように本発明の製
造法によつて、強度を高くすることなく、またオ
イルテンパー線の従来の製造法における如き高価
な特殊金属を用いることなく耐へたり性の優れた
ばね用鋼線が製造することができる。 As is clear from the above examples, the manufacturing method of the present invention can improve the fatigue resistance without increasing the strength or using expensive special metals as in the conventional manufacturing method of oil tempered wire. Excellent spring steel wire can be manufactured.
〓〓〓〓
また本発明品の鋼線は冷間加工型自動車用懸架
ばねに用いることによつて軽量化に役立つことが
わかつた。〓〓〓〓
It has also been found that the steel wire of the present invention is useful for weight reduction when used in cold-worked suspension springs for automobiles.
第１図は本発明の製造法を説明するための工程
を示す模式図、第２図、第３図は本発明の効果を
説明する図であり、第２図は機械的特性、第３図
は静的へたり試験結果を示す。である。
１：サプライ、２：線材、３，５，８，１３：
送り用ピンチロール、４：矯正機、６，１０：加
熱装置、７，１２：冷却槽、１１：伸直ロール、
１０：焼戻し加工装置、１４：巻取機、１５：本
発明鋼線。
〓〓〓〓
FIG. 1 is a schematic diagram showing the process for explaining the manufacturing method of the present invention, FIGS. 2 and 3 are diagrams explaining the effects of the present invention, FIG. 2 is a mechanical property, and FIG. indicates the static sag test results. It is. 1: Supply, 2: Wire rod, 3, 5, 8, 13:
Feeding pinch roll, 4: Straightening machine, 6, 10: Heating device, 7, 12: Cooling tank, 11: Straightening roll,
10: Tempering processing device, 14: Winding machine, 15: Steel wire of the present invention. 〓〓〓〓
Claims (1)
処理を施して製造されるばね用鋼線の製造法にお
いて、上記焼戻し処理を行つている過程で、当該
鋼線に伸直ロール等によつて曲げ歪量１％以上３
％以下の曲げ加工を加えることを特徴とする耐へ
たり性に優れたばね用鋼線の製造法。1. In the method of manufacturing spring steel wire with a carbon content of 0.5 to 0.7% by weight, which is quenched and then tempered, the steel wire is subjected to straightening rolls, etc. during the above tempering process. Bending strain of 1% or more 3
A method for manufacturing spring steel wire with excellent fatigue resistance, which is characterized by applying bending processing of less than %.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16569182A JPS5956520A (en) | 1982-09-22 | 1982-09-22 | Production of steel wire for spring having excellent settling resistance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16569182A JPS5956520A (en) | 1982-09-22 | 1982-09-22 | Production of steel wire for spring having excellent settling resistance |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5956520A JPS5956520A (en) | 1984-04-02 |
| JPS6159380B2 true JPS6159380B2 (en) | 1986-12-16 |
Family
ID=15817206
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16569182A Granted JPS5956520A (en) | 1982-09-22 | 1982-09-22 | Production of steel wire for spring having excellent settling resistance |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5956520A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59112581U (en) * | 1983-01-20 | 1984-07-30 | 株式会社広島 | Nailing jig |
| JPS6011484U (en) * | 1983-07-01 | 1985-01-25 | 株式会社富士通ゼネラル | Panel member locking structure |
| CN111730007B (en) * | 2020-08-07 | 2022-06-24 | 山东睿煜矿用材料加工有限公司 | Straightening device of reinforcing steel bar hoop bending machine |
-
1982
- 1982-09-22 JP JP16569182A patent/JPS5956520A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5956520A (en) | 1984-04-02 |
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