JPH07276234A - Stress added shot peening method for steel wire and device therefor - Google Patents
Stress added shot peening method for steel wire and device thereforInfo
- Publication number
- JPH07276234A JPH07276234A JP6515794A JP6515794A JPH07276234A JP H07276234 A JPH07276234 A JP H07276234A JP 6515794 A JP6515794 A JP 6515794A JP 6515794 A JP6515794 A JP 6515794A JP H07276234 A JPH07276234 A JP H07276234A
- Authority
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- Japan
- Prior art keywords
- steel wire
- shot peening
- stress
- wire
- bending
- Prior art date
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Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は鋼線のショットピーニン
グ方法および装置に関し、特に応力付加ショットピーニ
ングによる表面残留応力調整による疲労特性改善に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shot peening method and apparatus for steel wire, and more particularly to improving fatigue characteristics by adjusting surface residual stress by stressed shot peening.
【０００２】[0002]
【従来の技術】自動車用タイヤ、産業用各種ベルト類な
どの補強用に使用されている極細鋼線は、熱間圧延線材
より、中間伸線、最終パテンティング後、伸線加工性お
よびゴムとの接着性を付与するためにブラスめっき処理
を行い、仕上げ伸線することにより作製される。最近、
このブラスめっき鋼線の疲労特性を向上させる方法に、
ショットピーニングによって鋼線表面の残留引っ張り応
力を残留圧縮応力に変換することが注目されている。2. Description of the Related Art Extra-fine steel wire used for reinforcing automobile tires, various industrial belts, etc. is more suitable than hot-rolled wire for intermediate wire drawing, after final patenting, wire drawing workability and rubber. It is produced by performing a brass plating treatment to impart the adhesiveness of 1 and finishing wire drawing. Recently,
To improve the fatigue characteristics of this brass-plated steel wire,
Attention has been paid to converting the residual tensile stress of the steel wire surface into residual compressive stress by shot peening.
【０００３】従来の鋼線へのショットピーニングは直線
状態での適用が主体であった。この分野の公知技術とし
て、例えば特開平２−１７９３３３号公報のように、伸
線機または撚り線機へショットピーニング装置を組み込
み、ショットピーニングする場合でも直線状態で行われ
ていた。これは、鋼線にショットピーニングする場合、
弛緩防止のためにある程度の張力を付与する必要がある
ために、直線状態で行わなければならなかった。ショッ
トピーニングは強く行う程効果は増すので、直線状態で
行っても十分満足な効果が得られていた。Conventionally, shot peening for a conventional steel wire is mainly applied in a straight line state. As a known technique in this field, for example, as disclosed in Japanese Patent Laid-Open No. 2-179333, a shot peening apparatus is incorporated in a wire drawing machine or a twisting wire machine and shot peening is performed in a straight line state. This is because when shot peening on steel wire,
Since it is necessary to apply a certain amount of tension to prevent relaxation, it has to be performed in a straight state. The stronger the shot peening, the greater the effect. Therefore, even if the shot peening was performed in a straight line, a sufficiently satisfactory effect was obtained.
【０００４】しかし、上記従来のショットピーニング方
法は必ずしも効率的な方法ではなく、単に容易な方法で
あるといった理由から行われていた。本発明者等はより
効率的な残留応力調整方法を探索したところ、捻じりお
よび曲げ応力を付与した状態でショットピーニングを行
った後、直線状態に戻すことにより同一時間および同一
強度のショットピーニングでも効果が大きく向上するこ
とがわかった。However, the above-described conventional shot peening method is not always an efficient method, and is performed simply because it is an easy method. The inventors of the present invention searched for a more efficient residual stress adjusting method, and after performing shot peening in a state in which twisting and bending stress were applied, by returning to a linear state, shot peening at the same time and the same strength was also performed. It was found that the effect was greatly improved.
【０００５】この点より、ショットピーニング中に応力
を付加することによって、ショットピーニング方法の効
率的処理方法としての改善が望まれていた。From this point, it has been desired to improve the shot peening method as an efficient treatment method by applying stress during shot peening.
【０００６】[0006]
【発明が解決しようとする課題】本発明は従来の直線状
態でのショットピーニング方法を見直し、ショットピー
ニング中に積極的に弾性歪みとして、捻じりおよび／ま
たは曲げ応力を付加した状態でショットピーニングする
ことによって、鋼線の表面の残留応力をより効率的に調
整するためのショットピーニング方法を提供する。DISCLOSURE OF THE INVENTION The present invention has reviewed the conventional method of shot peening in a straight line state and shot peening in a state in which torsional and / or bending stress is positively applied as elastic strain during shot peening. Accordingly, a shot peening method for more efficiently adjusting the residual stress on the surface of the steel wire is provided.
【０００７】本発明の他の目的は、応力付加ショットピ
ーニング方法を連続した伸線ラインにおいて実施するた
めの装置を提供することである。Another object of the present invention is to provide an apparatus for carrying out the stressed shot peening method on a continuous wire drawing line.
【０００８】[0008]
【課題を解決するための手段】本発明は上記の課題を解
決するものであり、その要旨とするところは、 （１）伸線加工を行った鋼線の所要の長さ間に捻じりを
与え、該捻じり量が鋼線長手方向中心軸からｌ＝100 ｄ
（ｌ：捻じり長さ（mm）、ｄ：線径(mm)) で１〜 90 °
の範囲の角度になるように捻じり応力を付加しながらシ
ョットピーニングすることを特徴とする応力付加ショッ
トピーニング方法。Means for Solving the Problems The present invention is intended to solve the above-mentioned problems, and the gist thereof is as follows: (1) Twisting between the required lengths of a drawn steel wire. And the twist amount is l = 100 d from the central axis of the steel wire in the longitudinal direction.
(L: twist length (mm), d: wire diameter (mm)) 1 to 90 °
Shot peening method, wherein the shot peening is performed while applying the torsional stress so that the angle is within the range.
【０００９】（２）伸線加工を行った鋼線の所要の長さ
間に、撓みによる曲げを与え、該曲げ半径ｒ≦ 500ｄ
（ｒ：曲げ半径(mm)、ｄ：線径(mm)) となるように曲げ
応力を付加しながらショットピーニングすることを特徴
とする応力付加ショットピーニング方法。 （３）伸線加工を行った鋼線の所要の長さ間に捻じりを
与え、該捻じり量が鋼線長手方向中心軸からｌ＝100 ｄ
（ｌ：捻じり長さ（mm）、ｄ：線径(mm)) で１〜 90 °
の範囲の角度になるように、かつ同時に曲げ半径ｒ≦ 5
00ｄ（ｒ：曲げ半径(mm)、ｄ：線径(mm)) となるよう
に、捻じりおよび曲げ応力を付加しながらショットピー
ニングすることを特徴とする応力付加ショットピーニン
グ方法。(2) Bending due to bending is applied between the required lengths of the drawn steel wire, and the bending radius r ≦ 500d.
A stress-added shot peening method characterized by performing shot peening while applying bending stress so that (r: bending radius (mm), d: wire diameter (mm)). (3) A twist is applied to a required length of the drawn steel wire, and the twist amount is l = 100 d from the central axis of the steel wire in the longitudinal direction.
(L: twist length (mm), d: wire diameter (mm)) 1 to 90 °
Bending angle r ≤ 5
A stress-added shot peening method characterized by performing shot peening while applying twisting and bending stress so that 00d (r: bending radius (mm), d: wire diameter (mm)).
【００１０】（４）伸線加工ラインでオンラインにてシ
ョットピーニングする装置において、所要の長さの鋼線
に捻じりを付与する捻じり装置を設け、および／または
所定の長さの鋼線に撓みによる曲げを与える曲げ装置を
設け、該捻じり量が鋼線長手方向中心軸からｌ＝100 ｄ
（ｌ：捻じり長さ（mm）、ｄ：線径(mm)) で１〜 90°
の範囲の角度であり、該曲げ半径ｒ≦ 500ｄ（ｒ：曲げ
半径(mm)、ｄ：線径(mm)) となるように、捻じりおよび
／または曲げ応力を付加しながらショットピーニングす
ることを特徴とする伸線加工装置列である。(4) In an apparatus for performing shot peening online on a wire drawing line, a twisting device for imparting a twist to a steel wire of a required length is provided, and / or a steel wire of a predetermined length is provided. A bending device for bending by bending is provided, and the twist amount is l = 100 d from the central axis of the steel wire longitudinal direction.
(L: twist length (mm), d: wire diameter (mm)) 1 to 90 °
Shot peening while applying twisting and / or bending stress so that the bending radius r ≦ 500d (r: bending radius (mm), d: wire diameter (mm)). Is a line for wire drawing equipment.
【００１１】[0011]
【作用】本発明は鋼線のショットピーニングにおいて、
捻じりおよび／または曲げ応力を鋼線に付与した状態に
て、ショットピーニングするために、表面残留応力の調
整を容易とし、かつその量を増大させることを可能とす
る。すなわち、鋼線に付加する上記捻じりおよび／また
は曲げ応力に見合った歪みが鋼線の表面に一定に残留し
た状態下で、ショットピーニングすればこの値は増分と
して表面残留応力を分担することになる。The present invention is applicable to shot peening of steel wire.
Since shot peening is performed in a state in which a twisting and / or bending stress is applied to the steel wire, it is possible to easily adjust the surface residual stress and increase the amount thereof. That is, when the strain corresponding to the above-mentioned twisting and / or bending stress applied to the steel wire remains constant on the surface of the steel wire, shot peening will increase this value to share the surface residual stress. Become.
【００１２】本発明の限定理由を以下に説明する。本発
明は、捻じり量が鋼線長手方向中心軸からｌ＝100 ｄ
（ｌ：捻じり長さ（mm）、ｄ：線径(mm)) で１〜 90 °
の範囲の角度になるように応力を付加するものである。
捻じり量が鋼線長手方向中心軸から１°未満では、鋼線
の疲労限の改善効果が不十分であり、一方捻じり量が鋼
線長手方向中心軸から90°超では鋼線全体にショット球
が当たらなくなりショットピーニング効果が発揮されな
い。また、曲げ応力については曲げ半径ｒ≦ 500ｄ
（ｒ：曲げ半径(mm)、ｄ：線径(mm)) となるような応力
に限定するものである。これは曲げ半径ｒ＞ 500ｄ mm
では十分な曲げ応力が付加されず、鋼線の疲労限向上効
果が得られないことによる。The reason for limiting the present invention will be described below. In the present invention, the twist amount is l = 100 d from the central axis of the steel wire in the longitudinal direction.
(L: twist length (mm), d: wire diameter (mm)) 1 to 90 °
The stress is applied so that the angle is within the range.
If the amount of twist is less than 1 ° from the central axis of the steel wire longitudinal direction, the effect of improving the fatigue limit of the steel wire is insufficient, while if the amount of twist exceeds 90 ° from the central axis of the steel wire longitudinal direction, the entire steel wire is twisted. The shot ball does not hit and the shot peening effect is not exhibited. For bending stress, bend radius r ≦ 500d
The stress is limited to (r: bending radius (mm), d: wire diameter (mm)). This is the bending radius r> 500d mm
In that case, sufficient bending stress is not applied, and the effect of improving the fatigue limit of the steel wire cannot be obtained.
【００１３】以下に、本発明について実施例に基づいて
さらに説明する。The present invention will be further described below based on examples.
【００１４】[0014]
【実施例】鉛パテンティング処理後ブラスめっき（２μ
ｍ厚さ、Ｃｕ／Ｚｎ＝６５／３５）を行ったＳＷＲＳ８
２Ａ相当の１．３ｍｍ鋼線を０．２ｍｍまで伸線加工
し、下記の条件によってショットピーニング処理した。
ショットピーニングは空気投射式で空気圧力４ｋｇｆ／
ｃｍ2 、時間２ｓで行った。ショット球径は１０〜１０
０μｍにそろえた。捻じり角度はｌ＝100 ｄ換算なので
ｌ＝20 mm 相当の値である。[Example] Brass plating after lead patenting treatment (2μ
SWRS8 with m thickness, Cu / Zn = 65/35)
A 1.3 mm steel wire corresponding to 2 A was drawn to 0.2 mm and shot peened under the following conditions.
Shot peening is air projection type and air pressure is 4kgf /
The measurement was performed in cm 2 for 2 seconds. Shot ball diameter is 10-10
Aligned to 0 μm. The twist angle is equivalent to 1 = 20 mm because it is converted to 1 = 100 d.
【００１５】ショットピーニング処理後の０．２ｍｍ鋼
線の評価はハンター式回転曲げ疲労試験による１０7 回
での疲労限により行った。その結果を表１に、本発明お
よび比較例をまとめて示す。The 0.2 mm steel wire after the shot peening treatment was evaluated by the fatigue limit at 10 7 times by the Hunter type rotary bending fatigue test. The results are shown in Table 1 together with the present invention and comparative examples.
【００１６】[0016]
【表１】 [Table 1]
【００１７】表１において、本発明No.１〜４は捻じり
応力を付与した状態でショットピーニングを行った場合
で、長手方向中心軸からｌ＝100 ｄ相当で１〜90°の範
囲の捻じり角度なので、単にショットピーニングのみの
場合の比較例No.４と比べて疲労限が向上した。本発明N
o.５〜８は曲げ応力を付与した状態でショットピーニン
グを行った場合で、半径ｒ≦ 500ｄつまりｒ≦100mm の
曲げ応力を付与した状態なので、単にショットピーニン
グのみの場合の比較例No.４と比べて疲労限が向上し
た。In Table 1, the invention Nos. 1 to 4 are the cases where shot peening was performed in the state where the twisting stress was applied, and the twisting was within the range of 1 to 90 ° corresponding to 1 = 100 d from the central axis in the longitudinal direction. Since it is a straight angle, the fatigue limit was improved compared to Comparative Example No. 4 in which only shot peening was performed. Invention N
o.5 to 8 are the cases where the shot peening is performed with the bending stress applied, and the bending stress of the radius r ≦ 500d, that is, r ≦ 100 mm is applied. Therefore, the comparative example No. 4 in the case of only the shot peening is used. Fatigue limit was improved compared to.
【００１８】本発明No.９〜11は上記捻じりおよび曲げ
応力を同時に付与した場合で、さらに疲労限が向上し
た。比較例No.１は捻じり角度が１°以下のために、捻
じり応力が十分にかからなかったために、比較例No.２
は捻じり角度が90°以上のために、鋼線全体にショット
球があたらなかったために疲労限は向上しなかった。In Nos. 9 to 11 of the present invention, the above-mentioned twisting and bending stress were simultaneously applied, and the fatigue limit was further improved. Comparative Example No. 1 had a twisting angle of 1 ° or less, so that the torsional stress was not sufficiently applied, and therefore Comparative Example No. 2
Since the twist angle was 90 ° or more, there was no shot ball in the entire steel wire, so the fatigue limit did not improve.
【００１９】比較例No.３は曲げ半径が半径ｒ＞ 500ｄ
つまりｒ＞100mm のために十分な曲げ応力がかからず、
疲労限向上効果がなかった。比較例No.４は単にショッ
トピーニングのみ行った場合、比較例No.５はショット
ピーニングも行わなかった場合であり、本試験値の参考
値である。なお、本発明の装置列について、その一実施
態様によって、以下に説明する。In Comparative Example No. 3, the bending radius is radius r> 500d.
In other words, because r> 100mm, sufficient bending stress is not applied,
There was no effect of improving the fatigue limit. Comparative Example No. 4 is a case where only shot peening was performed, Comparative Example No. 5 was a case where shot peening was not performed, and is a reference value of this test value. The device array of the present invention will be described below according to one embodiment thereof.
【００２０】図１は本発明の曲げ応力の付加装置につい
ての、説明図である。この図で極細伸線後の鋼線１は巻
き取り装置４に入る前に、ブレーキ装置３とループ用ロ
ーラー２によってループ状に曲げられ、この曲げ半径を
制御して所要の曲げ応力が付加される。この曲げた状態
のところを所要のショットピーニング処理がなされる。
本発明に使用するショットピーニング装置は前記実施例
のごとく、空気投射方式であり、円筒状または直方体の
容器内においてショットピーニングされるものである。FIG. 1 is an explanatory view of a bending stress applying device of the present invention. In this figure, the steel wire 1 after extra-fine wire drawing is bent into a loop shape by the brake device 3 and the loop roller 2 before entering the winding device 4, and a required bending stress is applied by controlling the bending radius. It A required shot peening process is performed on this bent state.
The shot peening apparatus used in the present invention is of the air projection type as in the above-mentioned embodiment, and is shot peened in a cylindrical or rectangular parallelepiped container.
【００２１】同様にして、本発明の捻じり応力の付加方
法は、図１のブレーキ装置３または、所要の鋼線長さ間
の二箇所に鋼線捻じりのための捻じりガイドまたは回転
方式等の捻じり装置を設けることによって、捻じり応力
を付与しながら前記ショットピーニング装置によってシ
ョットピーニング処理されるものである。Similarly, the method of applying the twisting stress of the present invention is the braking device 3 of FIG. 1 or a twisting guide or a rotating method for twisting the steel wire at two positions between required lengths of the steel wire. A shot peening process is performed by the shot peening device while applying a twisting stress by providing a twisting device such as.
【００２２】[0022]
【発明の効果】本発明の条件で行ったショットピーニン
グ処理により、鋼線の疲労限向上はもちろん、ショット
ピーニング後でもゴムとの初期接着性および耐湿老化接
着性劣化防止が可能であり、工業的に利用価値は高い。By the shot peening treatment performed under the conditions of the present invention, not only the fatigue limit of the steel wire can be improved, but also the initial adhesion to rubber and the prevention of deterioration due to moisture aging adhesion can be prevented even after shot peening. The utility value is high.
【図１】本発明に係る曲げ応力を付与しながらショット
ピーニングする装置例を示す図である。FIG. 1 is a diagram showing an example of an apparatus for shot peening according to the present invention while applying bending stress.
【図２】本実施例に係るハンター式回転曲げ疲労試験方
法の概要を示す図である。FIG. 2 is a diagram showing an outline of a Hunter type rotary bending fatigue test method according to the present embodiment.
１…鋼線 ２…ループ用ローラー ３…ブレーキ装置 ４…巻き取り装置 ５…サンプル ６…自由端 ７…固定端 ８…回転治具 1 ... Steel wire 2 ... Loop roller 3 ... Brake device 4 ... Winding device 5 ... Sample 6 ... Free end 7 ... Fixed end 8 ... Rotating jig
Claims (4)
捻じりを与え、該捻じり量が鋼線長手方向中心軸からｌ
＝100 ｄ（ｌ：捻じり長さ（mm）、ｄ：線径(mm)) で１
〜 90 °の範囲の角度になるように捻じり応力を付加し
ながらショットピーニングすることを特徴とする応力付
加ショットピーニング方法。1. A twist is applied between required lengths of a drawn steel wire, and the twist amount is 1 from the central axis in the longitudinal direction of the steel wire.
= 100 d (l: twist length (mm), d: wire diameter (mm)) 1
A stress-added shot peening method characterized in that shot peening is performed while applying a twisting stress so that the angle is in the range of to 90 °.
に、撓みによる曲げを与え、該曲げ半径ｒ≦ 500ｄ
（ｒ：曲げ半径(mm)、ｄ：線径(mm)) となるように曲げ
応力を付加しながらショットピーニングすることを特徴
とする応力付加ショットピーニング方法。2. The bending radius r ≦ 500d is applied between the required lengths of the drawn steel wire by bending.
A stress-added shot peening method characterized by performing shot peening while applying bending stress so that (r: bending radius (mm), d: wire diameter (mm)).
捻じりを与え、該捻じり量が鋼線長手方向中心軸からｌ
＝100 ｄ（ｌ：捻じり長さ（mm）、ｄ：線径(mm)) で１
〜 90 °の範囲の角度になるように、かつ同時に曲げ半
径ｒ≦ 500ｄ（ｒ：曲げ半径(mm)、ｄ：線径(mm)) とな
るように、捻じりおよび曲げ応力を付加しながらショッ
トピーニングすることを特徴とする応力付加ショットピ
ーニング方法。3. A twisted wire is applied between required lengths of the drawn steel wire, and the amount of twist is 1 from the central axis of the steel wire in the longitudinal direction.
= 100 d (l: twist length (mm), d: wire diameter (mm)) 1
While applying twisting and bending stress so that the angle is in the range of up to 90 ° and at the same time the bending radius r ≦ 500d (r: bending radius (mm), d: wire diameter (mm)) A stress-added shot peening method characterized by shot peening.
トピーニングする装置において、所要の長さの鋼線に捻
じりを付与する捻じり装置を設け、および／または所定
の長さの鋼線に撓みによる曲げを与える曲げ装置を設
け、該捻じり量が鋼線長手方向中心軸からｌ＝100 ｄ
（ｌ：捻じり長さ（mm）、ｄ：線径(mm))で１〜 90 °
の範囲の角度であり、該曲げ半径ｒ≦ 500ｄ（ｒ：曲げ
半径(mm)、ｄ：線径(mm)) となるように、捻じりおよび
／または曲げ応力を付加しながらショットピーニングす
ることを特徴とする伸線加工装置列。4. A device for performing online shot peening on a wire drawing line is provided with a twisting device for imparting a twist to a steel wire of a required length, and / or bending to a steel wire of a predetermined length. A bending device for bending the wire is provided, and the twist amount is l = 100 d from the central axis of the steel wire in the longitudinal direction.
(L: twist length (mm), d: wire diameter (mm)) 1 to 90 °
Shot peening while applying twisting and / or bending stress so that the bending radius r ≦ 500d (r: bending radius (mm), d: wire diameter (mm)). A line for wire drawing equipment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6515794A JPH07276234A (en) | 1994-04-01 | 1994-04-01 | Stress added shot peening method for steel wire and device therefor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6515794A JPH07276234A (en) | 1994-04-01 | 1994-04-01 | Stress added shot peening method for steel wire and device therefor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH07276234A true JPH07276234A (en) | 1995-10-24 |
Family
ID=13278773
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6515794A Pending JPH07276234A (en) | 1994-04-01 | 1994-04-01 | Stress added shot peening method for steel wire and device therefor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07276234A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000225567A (en) * | 1999-02-05 | 2000-08-15 | Toyota Motor Corp | Shot peening method for metal plate |
| CN113265526A (en) * | 2021-04-27 | 2021-08-17 | 北京理工大学 | Numerically-controlled machine tool for assisting rolling reinforcement of torsion shaft torsion stress field and reinforcement method |
-
1994
- 1994-04-01 JP JP6515794A patent/JPH07276234A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000225567A (en) * | 1999-02-05 | 2000-08-15 | Toyota Motor Corp | Shot peening method for metal plate |
| CN113265526A (en) * | 2021-04-27 | 2021-08-17 | 北京理工大学 | Numerically-controlled machine tool for assisting rolling reinforcement of torsion shaft torsion stress field and reinforcement method |
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