JP3324078B2 - Cutting method of coil spring - Google Patents
Cutting method of coil springInfo
- Publication number
- JP3324078B2 JP3324078B2 JP35530996A JP35530996A JP3324078B2 JP 3324078 B2 JP3324078 B2 JP 3324078B2 JP 35530996 A JP35530996 A JP 35530996A JP 35530996 A JP35530996 A JP 35530996A JP 3324078 B2 JP3324078 B2 JP 3324078B2
- Authority
- JP
- Japan
- Prior art keywords
- coil spring
- wire
- wound
- cutting
- winding
- 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
Links
Landscapes
- Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
- Wire Processing (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、コンルばねの切断
方法に係る方法であって、さらに詳しくは、コイルばね
製造機の線ガイドから送り出される線材を捲回工具に衝
合させて巻回されたコイルばねの終端を切断する方法に
関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for cutting a conical spring, and more particularly, to a method for cutting a wire fed from a wire guide of a coil spring making machine into a coiling tool while abutting the wire. And a method for cutting the end of a coil spring.
【０００２】[0002]
【従来の技術】従来、コイルばね製造機におけるコイル
ばねの切断方法は、図１０の従来の技術の説明図に示す
ように、線ガイド１０２から送り出される線材Ｗを捲回
工具１０３Ａ，１０３Ｂに衝合させて巻回し、巻回され
たコイルばねＳの内周が当接する半円柱状の芯金１０６
の切刃面１０６ａ上端に形成された切刃と、進退可能な
切断工具１０５の切刃面１０５ａ前進端に形成された切
刃との剪断作用によってコイルばね巻回終端（以下コイ
ルばね終端と称す）Ｗｚの線材Ｗを切断する方法が一般
的である。2. Description of the Related Art Conventionally, in a method of cutting a coil spring in a coil spring manufacturing machine, as shown in an explanatory view of the prior art in FIG. 10, a wire W sent out from a wire guide 102 is impinged on winding tools 103A and 103B. A semi-cylindrical core bar 106 with which the inner circumference of the wound coil spring S abuts
The cutting edge formed at the upper end of the cutting edge surface 106a of the cutting tool 105 and the cutting edge formed at the forward end of the cutting edge surface 105a of the cutting tool 105 which can be advanced and retracted by the shearing action, the coil spring winding end (hereinafter referred to as coil).
It referred to as Rubane end) method of cutting the wire W of Wz is common.
【０００３】また、最近開発された技術では実公平４−
４４２８５号公報に記載された公知の技術がある。この
ものは図１１に示すように、曲げダイス２０３によって
円柱状の芯金２０６の外周に巻回されたコイルばねの終
端部に傷つけ手段２０７により線材Ａの軸方向に対して
横断状で、芯金２０６に向かって凹入する切り目イを入
れ、この切り目イの前後位置に捩じり折り手段２０８で
線材Ａに捩じり力を加えることにより、切り目イに応力
集中が生じて、ここから線材Ａをねじり折るものであ
る。[0003] Also, recently developed technology has a
There is a known technique described in Japanese Patent No. 44285. As shown in FIG. 11, the end of a coil spring wound around the outer periphery of a cylindrical core bar 206 by a bending die 203 is wound in a direction transverse to the axial direction of the wire A by means of damaging means 207. A cut is made in the metal material A by applying a torsion force to the wire A by the torsion folding means 208 at the front and rear positions of the notch A. The wire A is torsionally folded.
【０００４】[0004]
【発明が解決しようとする課題】従来の技術で述べた図
１０の芯金１０６と切断工具１０５とを用いて線材Ｗを
剪断して切断する方法は、コイル径が小径のコイルばね
を切断する場合、芯金も小径になる。特に線材径が大き
いコイルばねの場合には、線材Ｗ切断時の切断工具１０
５によって付加される剪断力で芯金１０６が破損し易い
という問題を有している。その上剪断作用によって生じ
るバリがコイルばねの内周側に突出し易いので、コイル
ばねを軸に挿通して使用する場合に軸の挿入が困難にな
るという問題をも有している。The method of cutting and cutting a wire W by using the cored bar 106 and the cutting tool 105 shown in FIG. 10 described in the prior art is to cut a coil spring having a small coil diameter. In this case, the core metal also has a small diameter. In particular, in the case of a coil spring having a large wire diameter, the cutting tool 10 for cutting the wire W is used.
5 has a problem that the core metal 106 is easily damaged by the shearing force applied by the core 5. In addition, since the burrs generated by the shearing action tend to protrude toward the inner peripheral side of the coil spring, there is also a problem that the insertion of the shaft becomes difficult when the coil spring is inserted through the shaft and used.
【０００５】また、実公平４−４４２８５号公報に記載
された先行技術は、線材Ａを捩じり折るために、芯金２
０６，傷つけ手段２０７，捩じり折り手段２０８が必要
でり、装置の構造が煩雑になるとともに、傷つけ手段に
よって切り目イを入れる必要があるため、コイルばねの
成形加工に要するサイクルタイムが長くなるという問題
を有している。更にコイル径が小径のコイルばねの場合
には、芯金２０６も小径となり強度不足となる。特に線
材径が大きいコイルばねを切断する場合には、線材Ａに
切り目を入れるための傷つけ手段によって付加される押
圧力で芯金２０６が破損し易いという問題を有してい
る。In the prior art described in Japanese Utility Model Publication No. 4-44285, the core material 2 is twisted to break the wire A.
06, which requires the damaging means 207 and the twist-folding means 208, which complicates the structure of the apparatus, and requires the cutting means to make a cut, thereby increasing the cycle time required for forming the coil spring. There is a problem that. Further, in the case of a coil spring having a small coil diameter, the core bar 206 also has a small diameter, resulting in insufficient strength. In particular, when cutting a coil spring having a large wire rod diameter, there is a problem that the core metal 206 is easily damaged by the pressing force applied by the damaging means for making a cut in the wire rod A.
【０００６】本発明は、従来の技術の有するこのうよな
問題点に鑑みてなされたものであり、その目的とすると
ころは、従来技術の図１０に示す芯金１０６及び切断工
具１０５、若しくは図１１に示す芯金２０６，傷つけ手
段２０７等を用いることなくコイルばねの終端を切断す
るようにして、破損し易い芯金を使用することなく、コ
イルばねの切断部にバリが生じ難く、コイルばねの加工
サイクルタイムが短縮され生産能率を向上させる簡素な
構造で低コストにできるコイルばねの切断方法を提供し
ようとするものである。The present invention has been made in view of such problems of the conventional technology, and has as its object the purpose of the present invention is to provide a core metal 106 and a cutting tool 105 shown in FIG. The end of the coil spring is cut without using the core bar 206, the damaging means 207, etc. shown in FIG. 11, and the cut portion of the coil spring hardly generates burrs without using a core bar which is easily damaged. An object of the present invention is to provide a method for cutting a coil spring which has a simple structure that can shorten the processing cycle time of the spring and improves production efficiency and can be manufactured at low cost.
【０００７】[0007]
【課題を解決するための手段】上記目的を達成するため
に請求項１の本発明のコイルばねの切断方法は、少なく
とも一対の送りローラによって線ガイドから送り出され
る線材を捲回工具に衝合させて巻回されたコイルばねの
終端を切断する方法であって、巻回されたコイルばね巻
回終端部への捩じり荷重付与部に線材捩じり手段の当接
面を当接させコイルばね成形繰り出し方向にコイルばね
を押圧してコイルばね巻回終端部の線材に捩じり荷重を
付与し、前記線材捩じり手段のコイルばねに向かう前進
によって前記コイルばね成形繰り出し方向の押圧量を増
大させ前記捩じり荷重がコイルばね巻回終端部の線材自
体の破断限界応力を超えるまで前記線材捩じり手段をさ
らに前進させて、コイルばね巻回終端で線材を捩じり切
るようにしたものである。According to a first aspect of the present invention, there is provided a method of cutting a coil spring, comprising the steps of: abutting a wire material fed from a wire guide by at least a pair of feed rollers onto a winding tool; a method of cutting the end of the wound coil springs Te, is brought into contact with the abutment surface of the wire twisting means to the load applying section torsional the coil spring winding terminal end portion wound coils spring forming feeding direction in the coil spring
To apply a torsional load to the wire at the end of the coil spring winding, and increase the amount of pressing in the coil spring forming and extending direction by advancing the wire torsion means toward the coil spring. Until the load exceeds the breaking limit stress of the wire itself at the end of the coil spring winding, the wire torsion means is used.
Further , the wire is twisted at the end of winding of the coil spring.
【０００８】請求項１のコイルばねの切断方法によれ
ば、コイルばね巻回終端部（以下コイルばね終端部と称
す）への捩じり荷重付与部を線材捩じり手段によりコイ
ルばね成形繰り出し方向に押圧して、コイルばね終端部
の線材に捩じり荷重を付与し、捩じり荷重がコイルばね
終端部の線材自体の破断限界応力を超えたとき、コイル
ばね終端で線材を捩じり切って切断するようになしたの
で、破損し易い芯金を用いる必要がなく、コイルばねの
切断部にバリが生じ難くなるとともに、コイルばねの加
工サイクルタイムが短縮され生産能率を向上させること
ができ、ローコストで簡素な構造の装置によってコイル
ばねの終端が切断できる。[0008] According to the coil spring cutting method of the first aspect, a coil spring winding end portion (hereinafter referred to as a coil spring end portion).
Torsion load is applied to the wire at the end of the coil spring by the wire torsion means to apply a torsion load to the wire at the end of the coil spring. When the stress exceeds the breaking limit of the wire itself , the wire is torsionally cut off at the end of the coil spring. , The machining cycle time of the coil spring can be shortened, the production efficiency can be improved, and the end of the coil spring can be cut by a low-cost and simple-structure device.
【０００９】また、請求項２のコイルばねの切断方法
は、コイルばね巻回終端部の線材に捩じり荷重が付与さ
れたとき、コイルばね巻回終端を含む捲回工具側の線材
の外周に近接して設けられた補助工具に前記線材の外周
を当接させて，該線材の外周方向への膨出を規制するよ
うにしたものである。A method for cutting a coil spring according to a second aspect of the present invention.
When the load torsion wire of the coil spring wound end portion is applied, the outer periphery of the wire in the auxiliary tool provided close to the outer circumference of the tool side of the wire Kai wound including a coil spring wound end To restrict the swelling of the wire in the outer circumferential direction.
【００１０】請求項２の方法によれば、コイルばね終端
部の線材に捩じり荷重が付与されたとき、補助工具にコ
イルばね終端を含む捲回工具側の線材Ｗの外周を当接さ
せて、線材の外周方向への膨出を規制するようにしたの
で、コイルばねの切断位置であるコイルばね終端の位置
設定が容易で、切断位置の再現性が容易に得られ、コイ
ルばねの切断位置精度が向上する。 According to the method of the second aspect, when a torsion load is applied to the wire at the terminal end of the coil spring, the outer periphery of the wire W on the winding tool side including the coil spring end is brought into contact with the auxiliary tool. As a result, the bulging of the wire in the outer peripheral direction is restricted, so that the position of the coil spring end, which is the cutting position of the coil spring, can be easily set, and the reproducibility of the cutting position can be easily obtained. Position accuracy is improved.
【００１１】また、請求項３のコイルばねの切断方法
は、線材捩じり手段が当接するコイルばね巻回終端部へ
の捩じり荷重付与部の作用位置は、コイルばね巻回終端
よりほぼ半周前のコイルばね終端と対向する位置であ
り、該線材の捩じり荷重付与部に線材捩じり手段の当接
面を当接させてコイルばねをコイル成形繰り出し方向に
押圧するようにしたものである。A method for cutting a coil spring according to a third aspect of the present invention.
The acting position of the torsional load applying portion of the wire twisting means <br/> the coil spring winding terminal end portion abutting faces the substantially half the previous coil springs terminating the coil spring winding termination And the contact surface of the wire torsion means is brought into contact with the torsion load applying portion of the wire to press the coil spring in the coil forming and feeding direction.
【００１２】請求項３の方法によれば、線材捩じり手段
が当接するコイルばね巻回終端面の捩じり荷重付与部の
作用位置を、コイルばね終端よりほぼ半周前のコイルば
ね終端と対向する位置としたので、コイルばねの切断位
置であるコイルばね終端で線材に捩じり荷重を効果的に
集中させることができ、切断位置の位置決めが容易にで
きるとともに、てこの原理による小さい力で線材の捩じ
り荷重付与部に必要な押圧力を加えることが可能で、捩
じり荷重付与部の線材に線材捩じり手段による傷が付き
難く、また線材捩じり手段の剛性を特別に考慮する必要
がない。 According to the method of claim 3, the operating position of the torsional load applying portion of the coil spring winding terminal end face wire torsion means abutting a coil spring terminated by Riho URN half before the coil spring end Since the position is opposed to the end , the torsion load can be effectively concentrated on the wire rod at the end of the coil spring, which is the cutting position of the coil spring, and the positioning of the cutting position can be easily performed. The required pressing force can be applied to the wire torsion load applying portion with a small force, and the wire of the torsion load applying portion is hardly damaged by the wire torsion means. No special consideration is required for rigidity.
【００１３】また、請求項４のコイルばねの切断方法
は、線材捩じり手段は、コイルばねに向かう前進量が増
すに従い巻回されたコイルばねをコイルばね成形繰り出
し方向へ押圧する押圧量が増すように先端部に傾斜面を
有し、該傾斜面のコイルばねに向かう前進位置を選択的
に位置決めすることによって、コイルばね胴部に所定の
ピッチの付与とコイルばね巻回終端部の線材に捩じり荷
重の付与とが可能なピッチ工具を用いるようにしたもの
である。A method for cutting a coil spring according to claim 4 is also provided.
The wire torsion means has an inclined surface at the distal end so that the amount of pressing of the wound coil spring in the coil spring forming and extending direction increases as the amount of advance toward the coil spring increases. A pitch tool capable of applying a predetermined pitch to the coil spring body and applying a torsional load to the wire at the coil spring winding end portion by selectively positioning the forward position toward the coil spring on the surface. It is intended to be used.
【００１４】請求項４の方法によれば、線材捩じり手段
の先端部に形成された傾斜面のコイルばねに向かう前進
位置を選択的に位置決めすることにより、コイルばね胴
部に所定のピッチが付与可能であるとともに、コイルば
ね終端部の線材に捩じり荷重が付与可能なピッチ工具を
用いるようにしたので、装置の構造が簡素になり、工具
費の節減もできる。 According to the fourth aspect of the present invention, by selectively positioning the forward position of the inclined surface formed at the tip end of the wire torsion means toward the coil spring, a predetermined pitch is provided on the coil spring body. And a pitch tool capable of applying a torsional load to the wire rod at the end of the coil spring, so that the structure of the apparatus is simplified and the tool cost can be reduced.
【００１５】[0015]
【発明の実施の形態】以下本発明の実施の形態について
図面にもとづいて説明する。図１は、本発明のコイルば
ね切断方法に用いる装置の構造説明用の正面図、図２は
同じく本発明に用いる装置の構成説明用の側面図であ
る。図１，図２において、コイルばね製造機の前板４上
に線材Ｗの送り手段として上下に対向配置された一対の
送りローラ１，１を備え、送りローラ１，１の線材Ｗの
送り方向前側に線材Ｗの通る貫通案内穴を有する線ガイ
ド２が設けられている。Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a front view for explaining the structure of an apparatus used in the coil spring cutting method of the present invention, and FIG. 2 is a side view for explaining the structure of the apparatus also used in the present invention. In FIGS. 1 and 2, a pair of feed rollers 1, 1 vertically arranged opposite to each other as a means for feeding a wire W is provided on a front plate 4 of a coil spring manufacturing machine. A wire guide 2 having a through guide hole through which the wire W passes is provided on the front side.
【００１６】更に、前板４上には線ガイド２の線材送り
方向前側の斜め下と斜め上とに第１捲回工具３Ａと第２
捲回工具３Ｂとが、コイルばね巻回中心ａの回りに所定
角度を有して放射状に進退位置調節可能に配設されてお
り、巻回中心ａに向かう第１捲回工具３Ａと第２捲回工
具３Ｂとの先端面に線材Ｗと当接する円弧状の案内溝３
ａ，３ａがそれぞれ刻設されている。Further, on the front plate 4, the first winding tool 3A and the second
A winding tool 3B is disposed at a predetermined angle around the coil spring winding center a so as to be capable of adjusting the advance / retreat position radially, and the first winding tool 3A and the second winding tool 3A toward the winding center a are arranged. An arc-shaped guide groove 3 in contact with the wire W on the end surface of the winding tool 3B
a and 3a are engraved, respectively.
【００１７】更に、前板４上には巻回中心ａの下方に線
材捩じり手段１０のスライド体１１が案内面を垂直にし
てボルト１４，１４により締着され、スライド体１１の
鉛直案内面に沿って進退可能に工具ホルダ１２が設けら
れ、工具ホルダ１２にピッチ工具１３がボルト１５，１
５により着脱可能に鉛直に取着されており、工具ホルダ
１２は図示しない駆動装置により進退と位置決めとが可
能とされている。ピッチ工具１３は上端部前側に角度θ
を有する傾斜面１３ａが形成されていて、傾斜面１３ａ
の背面となる鉛直面１３ｂは前進時に線ガイド２の切欠
き面２ａと摺動可能に隣接するようになっている。Further, on the front plate 4, a slide body 11 of the wire rod twisting means 10 is fastened by bolts 14, 14 with the guide surface vertical, below the winding center a.
Movably tool holder 12 is provided along the lead straight guide surface, the pitch tool 13 volts to the tool holder 12 15,1
5 is detachably lead directly attached by the tool holder 12 is capable and the positioning and retreat is by a driving device (not shown). The pitch tool 13 has an angle θ
Is formed, and the inclined surface 13a
'S become vertical plane 13b back is adapted to the adjacent possible notch surface 2a and the sliding line guide 2 during forward.
【００１８】更に、前板４には巻回中心ａの上方に補助
工具２０が突出するように植設されていて、補助工具２
０は線ガイド２の先端から送り出され捲回工具３Ａ，３
Ｂに衝合されてほぼ半周巻回された状態の線材Ｗの始端
Ｗａ、すなわち巻回されたコイルばねＳの終端Ｗｚを含
む第２捲回工具３Ｂ側の線材Ｗの外周に下端面２０ａが
接近して配設され、巻回されたコイルばねの終端部に線
材捩じり手段１０により捩じり荷重が付与されたとき、
補助工具２０の下端面２０ａに線材Ｗが当接して前記線
材の外周方向への膨出を規制するようになっている。Further, an auxiliary tool 20 is implanted on the front plate 4 so as to protrude above the winding center a.
0 is sent from the tip of the wire guide 2 and the winding tools 3A, 3
A lower end surface 20a is formed on the outer periphery of the wire W on the side of the second winding tool 3B including the starting end Wa of the wire W in a state of being abutted with B and being wound substantially half way around, that is, including the end Wz of the wound coil spring S. When a torsion load is applied by the wire rod torsion means 10 to the terminal end of the coil spring which is disposed close to and wound around the coil spring,
The wire W comes into contact with the lower end surface 20a of the auxiliary tool 20, and restricts the wire from bulging in the outer peripheral direction.
【００１９】続いて、本実施例のコイルばねの切断方法
の作用例を図３乃至図８の作用説明図によって説明す
る。作用説明に先立って本実施の形態の作用例によって
巻回されるコイルばねについて図９の説明図により説明
する。図９において、コイルばねＳは、寸法がコイル平
均径Ｄ＝５．８ｍｍ，線材直径ｄ＝２．６ｍｍで、ばね
指数Ｄ／ｄ＝２．２であるコイル径に対して線材径が大
きいコイルばねで、従来の切断方法では切断用芯金が小
径となって破損し易くなる寸法のコイルばねであり、線
材Ｗの材質は高抗張力線材であるＪＩＳ記号のＳＷＯＳ
Ｃ−Ｖ（弁ばね用オイルテンパー線）を使用している。
尚、前記ばね指数Ｄ／ｄ＝２．２は、本発明の切断方法
によるばね指数の限界を示すものではない。Next, an example of the operation of the method for cutting the coil spring of the present embodiment will be described with reference to FIGS. Prior to the description of the operation, the coil spring wound by the operation example of the present embodiment will be described with reference to the explanatory diagram of FIG. In FIG. 9, the coil spring S has a coil diameter larger than the coil diameter having a coil average diameter D = 5.8 mm, a wire diameter d = 2.6 mm, and a spring index D / d = 2.2. It is a coil spring having a size such that the cutting core has a small diameter and is easily broken by the conventional cutting method, and the material of the wire W is a high tensile strength wire JIS symbol SWOS.
CV (oil tempered wire for valve spring) is used.
The spring index D / d = 2.2 does not indicate the limit of the spring index according to the cutting method of the present invention.
【００２０】図３は、コイルばね成形前の待機位置を示
す説明図、すなわち前のコイルばねの切断が終わって次
のコイルばねの成形をするための待機姿勢を示す図であ
る。図３において、図１に示す送りローラ１，１により
線ガイド２より線材Ｗが送り出され、第１捲回工具３
Ａ，第２捲回工具３Ｂに衝合されてほぼ半周巻回され補
助工具２０の当接面２０ａの角部近傍に位置する線材Ｗ
の先端が次に成形するコイルばねＳの始端Ｗａとなる。FIG. 3 is an explanatory view showing a standby position before the coil spring is formed, that is, a standby posture for forming the next coil spring after the cutting of the previous coil spring is completed. 3, a wire W is fed from a wire guide 2 by feed rollers 1 and 1 shown in FIG.
A, the wire W is located in the vicinity of the corner portions of the abutment surface 20a of the second winding is abutted to the tool 3B is wound almost half winding complement <br/> assistant tool 20
Is the starting end Wa of the coil spring S to be formed next.
【００２１】図４は、コイルばねＳの成形途中の状態を
示す説明図である。図４において、停止していた送りロ
ーラ１，１が回転されて線材Ｗの送り出しが再開される
と、下方の待機位置に位置決めされていたピッチ工具１
３がコイルばねに向かって前進して、上端部に形成され
た傾斜面１３ａがコイルばねＳのピッチ付与部Ｗｐに当
接して、線材Ｗにピッチが付与され、コイルばねＳの胴
部が成形される。FIG. 4 is an explanatory view showing a state in which the coil spring S is being formed. In FIG. 4, when the feed rollers 1 and 1 that have been stopped are rotated to resume feeding of the wire W, the pitch tool 1 that has been positioned at the lower standby position.
3 moves forward toward the coil spring, the inclined surface 13a formed at the upper end abuts on the pitch applying portion Wp of the coil spring S, the pitch is applied to the wire W, and the body of the coil spring S is formed. Is done.
【００２２】図５は、コイルばねＳの形成が最終段階に
達した状態を示す説明図である。図５において、送りロ
ーラ１，１による線材Ｗの送り出し量が所定長さに近づ
くと、ピッチ工具１３が後退して、線材Ｗに付与されて
いるピッチが減少し、やがてピッチ工具１３が線材Ｗか
ら離れて最終巻回部の座巻き成形が行われ、線材送り出
し量が所定長さに達すると送りローラ１，１の回転は停
止され、線材の送り出しが止まり、コイルばねＳの巻回
が終わる。FIG. 5 is an explanatory view showing a state where the formation of the coil spring S has reached the final stage. In FIG. 5, when the feed amount of the wire W by the feed rollers 1 and 1 approaches a predetermined length, the pitch tool 13 retreats, the pitch applied to the wire W decreases, and eventually the pitch tool 13 When the wire feed amount reaches a predetermined length, the rotation of the feed rollers 1 and 1 is stopped, the wire feed stops, and the winding of the coil spring S ends. .
【００２３】図６は、巻回が終わったコイルばねＳの終
端部に捩じり荷重が付与される状態を示す説明図であ
る。図６において、送りローラ１，１の回転が停止され
た後、ピッチ工具１３が再びコイルばねに向かって前進
して傾斜面１３ａがコイルばねＳの巻回終端部への捩じ
り荷重付与部Ｗｔに当接し、ピッチ工具１３の前進量が
増すに従い傾斜面１３ａの図２に示す傾斜角θによって
コイルばねＳがコイルばね成形繰り出し方向に押圧され
る。この押圧により補助工具２０の当接面２０ａに巻回
終端（以下終端と称す）Ｗｚを含む第２捲回工具３Ｂ側
の線材Ｗ外周が当接する。そしてコイルばね成形繰り出
し方向に押圧されたコイルばねＳは、巻回終端部（以下
終端部と称す）の線材Ｗが補助工具２０と当接し、更に
巻回当接部Ｗｂの線材Ｗが第２捲回工具３Ｂの案内溝３
ａと当接していて、線材Ｗの切断すべき終端Ｗｚよりほ
ぼ半周前の終端Ｗｚと対向する捩じり荷重付与部Ｗｔが
ピッチ工具１３の傾斜面１３ａによりコイルばね成形繰
り出し方向に押圧されているので、コイルばねＳの終端
Ｗｚには、線材Ｗの軸線を横断する方向に捩じり荷重が
集中する。FIG. 6 is an explanatory view showing a state in which a torsional load is applied to the terminal end of the coil spring S that has been wound. In FIG. 6, after the rotation of the feed rollers 1 and 1 is stopped, the pitch tool 13 advances again toward the coil spring, and the inclined surface 13a is applied to the torsion load applying section to the winding end of the coil spring S. Wt, the coil spring S is pressed in the coil spring forming and feeding direction by the inclination angle θ of the inclined surface 13a shown in FIG. 2 as the advance amount of the pitch tool 13 increases. By this pressing, the outer periphery of the wire W on the second winding tool 3B side including the winding end (hereinafter referred to as the end) Wz abuts on the contact surface 20a of the auxiliary tool 20. In the coil spring S pressed in the coil spring forming and extending direction, the wire W of the winding end portion (hereinafter, referred to as the end portion) abuts on the auxiliary tool 20, and the wire W of the winding contact portion Wb becomes the second wire. Guide groove 3 of winding tool 3B
a, and the torsional load applying portion Wt facing the terminal Wz which is almost half a circle before the terminal Wz to be cut of the wire W is pressed by the inclined surface 13a of the pitch tool 13 in the coil spring forming and feeding direction. Therefore, the torsional load concentrates on the terminal end Wz of the coil spring S in a direction crossing the axis of the wire W.
【００２４】図７は、コイルばねＳが切断される直前の
状態を示す説明図、図８は切断された直後の状態を示す
説明図である。図７において、ピッチ工具１３が更に前
進してコイルばねＳの捩じり付与部Ｗｔをさらに押圧
し、この押圧によるコイルばねＳの終端Ｗｚに集中する
捩じり荷重が、コイルばね終端部の線材Ｗ自体の破断限
界応力を超えると、図８においてコイルばねＳの終端Ｗ
ｚが捩じり切られて切断され、コイルばねＳは線材Ｗか
ら分断されて落下する。そしてピッチ工具１３が後退し
て待機位置に戻り図３に示す待機姿勢となる。FIG. 7 is an explanatory diagram showing a state immediately before the coil spring S is cut, and FIG. 8 is an explanatory diagram showing a state immediately after the coil spring S is cut. In FIG. 7, the pitch tool 13 further advances to further press the torsion imparting portion Wt of the coil spring S, and the torsional load concentrated on the terminal end Wz of the coil spring S due to this pressing causes When the breaking limit stress of the wire W itself is exceeded, the end W of the coil spring S in FIG.
z is twisted and cut, and the coil spring S is separated from the wire W and falls. Then, the pitch tool 13 retreats, returns to the standby position, and assumes the standby posture shown in FIG.
【００２５】尚、補助工具２０は、上述のように捩じり
荷重付与時にコイルばねの終端Ｗｚが、当接面２０ａの
角部に係合するように第２捲回工具３Ｂ側に近接して、
終端部の線材Ｗの外周方向への膨出を規制しているの
で、コイルばねＳの終端Ｗｚに荷重が集中し易くなり、
切断位置の再現が容易になるなどの効果を有するもので
あるが、必ずしも必要ではなく、コイルばねＳの切断位
置精度さえ許されれば無くてもよい。The auxiliary tool 20 is close to the second winding tool 3B so that the end Wz of the coil spring is engaged with the corner of the contact surface 20a when the torsional load is applied as described above. hand,
Since the swelling of the wire W at the terminal end in the outer peripheral direction is regulated, the load is easily concentrated on the terminal Wz of the coil spring S,
This has an effect of facilitating reproduction of the cutting position, but is not always necessary, and may not be necessary as long as the cutting position accuracy of the coil spring S is permitted.
【００２６】また、上述した線材Ｗを衝合させてコイル
状に巻回する捲回工具３Ａ，３Ｂは必ずしも２本必要で
はなく、コイル径と線材径との関係により１本でもよ
い。Also, the number of the winding tools 3A and 3B for abutting and winding the wire W in a coil shape is not necessarily required, but may be one depending on the relationship between the coil diameter and the wire diameter.
【００２７】また、線材捩じり手段１０は、コイルばね
成形繰り出し方向に進退可能な例えば周知の押出しピッ
チ工具を用い、コイルばねＳの巻回終端を押圧するよう
にしても本発明は実施できる。Further, the wire twisting means 10, using a coil spring forming feeding direction to allow forward and backward a example known extrusion pitch tool, but the present invention so as to press the winding termination of the coil spring S is performed it can.
【００２８】[0028]
【発明の効果】本発明は上述のとおり構成されているの
で次に記載する効果を奏する。請求項１は、巻回された
コイルばね巻回終端部への捩じり荷重付与部を押圧して
コイルばね終端部の線材に捩じり荷重を付与し、捩じり
荷重が線材の破断限界応力を超えたときコイルばね終端
を捩じり切って切断するようにしたので、簡素な構造の
装置によりコイルばね終端の切断が可能になり、破損し
易い芯金を用いる必要がなくなり、コイルばねの切断部
にバリが生じ難くなり、コイルばねの加工サイクルタイ
ムが短縮され生産能率を向上できる。Since the present invention is configured as described above, the following effects can be obtained. The torsion load is applied to the wire at the end of the coil spring by pressing the torsion load imparting portion to the wound end of the coil spring, and the torsion load causes the wire to break. When the limit stress is exceeded, the end of the coil spring is cut off by twisting, so that the end of the coil spring can be cut by a device with a simple structure, and there is no need to use a core metal that is easily damaged. Burrs are less likely to occur in the cut portion of the spring, and the processing cycle time of the coil spring can be shortened, and the production efficiency can be improved.
【００２９】請求項２は、コイルばね終端部の線材に捩
じり荷重が付与されたとき、補助工具にコイルばね終端
を含む捲回工具側の線材外周を当接させて、線材の外周
方向への膨出を規制するようにしたので、コイルばねの
切断位置の位置設定が容易で、切断位置の再現性に優
れ、コイルばねの切断位置精度が向上する。According to a second aspect of the present invention, when a torsion load is applied to the wire at the terminal end of the coil spring, the outer periphery of the wire on the winding tool side including the coil spring end is brought into contact with the auxiliary tool, and the outer peripheral direction of the wire is set. Since the bulge is restricted, the position of the cutting position of the coil spring can be easily set, the reproducibility of the cutting position is excellent, and the cutting position accuracy of the coil spring is improved.
【００３０】請求項３は、線材捩じり手段が当接するコ
イルばね巻回終端部への捩じり荷重付与部の作用位置
を、コイルばね終端よりほぼ半周前のコイルばね終端と
対向する位置としたので、コイルばねの切断位置である
コイルばね終端の線材に捩じり荷重を効果的に集中させ
ることが可能となり、切断位置の位置決めが容易にでき
るとともに、小さな力で線材の捩じり荷重付与部に必要
な押圧力を加えることができ、捩じり荷重付与部の線材
に線材捩じり手段による傷が付き難く、また線材捩じり
手段の剛性も特別に配慮する必要がない。The third aspect, the wire twisting means to the operative position of the torsional load applying portion of the coil spring winding terminal end portion abuts, Riho by the coil spring end crucible and coil spring termination before half < The opposing position makes it possible to effectively concentrate the torsional load on the wire rod at the end of the coil spring, which is the cutting position of the coil spring. in can be added to the pressing force required for the torsional load applying section of the wire, hardly scratched by wire torsion unit to the wire of the torsion load applying section, also the rigidity of the wire twisting means special There is no need to consider.
【００３１】請求項４は、線材捩じり手段の先端部に形
成された傾斜面の前進位置を選択的に位置決めすること
により、コイルばねの胴部のピッチ付与と、コイルばね
終端の捩じり荷重付与とが可能なピッチ工具を用いるよ
うにしたので装置の構成が一層簡素になり、工具費も節
減できる。According to a fourth aspect of the present invention, the pitch of the body of the coil spring and the twisting of the terminal end of the coil spring are selectively determined by selectively positioning the forward position of the inclined surface formed at the tip of the wire torsion means. Since a pitch tool capable of applying a load is used, the configuration of the apparatus is further simplified, and tool costs can be reduced.
【図１】本発明のコイルばねの切断方法に用いる装置の
構造説明用の正面図である。FIG. 1 is a front view for explaining the structure of an apparatus used for a method for cutting a coil spring according to the present invention.
【図２】本発明のコイルばねの切断方法に用いる装置の
構造説明用の側面図である。FIG. 2 is a side view for explaining the structure of an apparatus used in the method for cutting a coil spring according to the present invention.
【図３】本発明の作用説明図で、加工前の待機位置を示
す、（ａ）は正面図、（ｂ）は側面図である。FIGS. 3A and 3B are explanatory views of the operation of the present invention, showing a standby position before machining, wherein FIG. 3A is a front view and FIG. 3B is a side view.
【図４】同じく本発明の作用説明図で、コイルばね形成
途中の状態を示す、（ａ）は正面図、（ｂ）は側面図で
ある。FIG. 4 is an explanatory view of the operation of the present invention, showing a state in which a coil spring is being formed. FIG. 4 (a) is a front view and FIG. 4 (b) is a side view.
【図５】同じく本発明の作用説明図で、コイルばねの最
終巻回部が座巻き成形される状態を示す、（ａ）は正面
図、（ｂ）は側面図である。FIG. 5 is an explanatory view of the operation of the present invention, showing a state where the final winding portion of the coil spring is formed by end winding; (a) is a front view, and (b) is a side view.
【図６】同じく本発明の作用説明図で、コイルばね終端
部に捩じり荷重が付与される状態を示す、（ａ）は正面
図、（ｂ）は側面図である。FIG. 6 is an explanatory view of the operation of the present invention, wherein a coil spring end is shown.
FIG. 3A is a front view and FIG. 3B is a side view showing a state in which a torsional load is applied to the portion .
【図７】同じく本発明の作用説明図で、コイるばね終端
が切断される直前の状態を示す、（ａ） は正面図、
（ｂ）は側面図である。FIG. 7 is a view for explaining the operation of the present invention, showing a state immediately before the end of the coil spring is cut off, (a) is a front view,
(B) is a side view.
【図８】同じく本発明の作用説明図で、コイルばねが線
材から切断された状態を示す、（ａ）は正面図、（ｂ）
は側面図である。FIG. 8 is an explanatory view of the operation of the present invention, showing a state where the coil spring is cut from the wire rod, (a) is a front view, (b)
Is a side view.
【図９】巻回されたコイルばねの説明図で、（ａ）は正
面図、（ｂ）は側面図である。9A and 9B are explanatory views of a wound coil spring, wherein FIG. 9A is a front view and FIG. 9B is a side view.
【図１０】従来の技術の切断工具と芯金とによるコイル
ばね切断の説明図で、（ａ）は正面図、（ｂ）は側面図
である。FIGS. 10A and 10B are explanatory diagrams of cutting of a coil spring by a cutting tool and a core metal according to a conventional technique, wherein FIG. 10A is a front view and FIG. 10B is a side view.
【図１１】従来の技術の傷つけ手段により線材に切り目
を入れたのち切断するコイルばね切断の説明図である。FIG. 11 is an explanatory view of cutting a coil spring, which cuts a wire after cutting the wire by a conventional damaging means.
１ 送りローラ ２ 線ガイド ３Ａ 第１捲回工具 ３Ｂ 第２捲回工具 １０ 線材捩じり手段 １３ ピッチ工具 １３ａ 傾斜面 ２０ 補助工具 ２０ａ 当接面 Ｓ コイルばね Ｗ 線材 Reference Signs List 1 feed roller 2 wire guide 3A first winding tool 3B second winding tool 10 wire twisting means 13 pitch tool 13a inclined surface 20 auxiliary tool 20a contact surface S coil spring W wire
Claims (4)
ガイドから送り出される線材を捲回工具に衝合させて巻
回されたコイルばねの終端を切断する方法であって、巻
回されたコイルばね巻回終端部への捩じり荷重付与部に
線材捩じり手段の当接面を当接させコイルばね成形繰り
出し方向にコイルばねを押圧してコイルばね巻回終端部
の線材に捩じり荷重を付与し、前記線材捩じり手段のコ
イルばねに向かう前進によって前記コイルばね成形繰り
出し方向の押圧量を増大させ前記捩じり荷重がコイルば
ね巻回終端部の線材自体の破断限界応力を超えるまで前
記線材捩じり手段をさらに前進させて、コイルばね巻回
終端で線材を捩じり切るようにしたことを特徴とするコ
イルばねの切断方法。1. A method for cutting a terminal end of a wound coil spring by abutting a wire fed from a wire guide by at least a pair of feed rollers with a winding tool, wherein the wound coil spring is wound. to press the abutment surface is abutted coils spring forming feeding direction to the coil spring of wire torsion means torsional load applying portion to the terminal end twist to the wire of the coil spring winding termination and applying a load, co of the wire twisting means
The coil spring is formed by advancement toward the il spring.
The wire rod torsion means is further advanced until the torsion load exceeds the breaking limit stress of the wire rod itself at the coil spring winding terminal end by increasing the pressing amount in the dispensing direction, and the coil spring is wound. A method for cutting a coil spring, wherein a wire is twisted off at an end.
重が付与されたとき、コイルばね巻回終端を含む捲回工
具側の線材の外周に近接して設けられた補助工具に前記
線材の外周を当接させて，該線材の外周方向への膨出を
規制するようにしたことを特徴とする請求項１に記載の
コイルばねの切断方法。When wherein load torsion wire of the coil spring wound end portion is applied, the auxiliary tool provided close to the outer circumference of the tool side of the wire Kai wound including a coil spring wound end 2. The method for cutting a coil spring according to claim 1, wherein an outer periphery of the wire is brought into contact with the wire to restrict the bulging of the wire in an outer circumferential direction.
回終端部への捩じり荷重付与部の作用位置は、コイルば
ね巻回終端よりほぼ半周前のコイルばね巻回終端と対向
する位置であり、該線材の捩じり荷重付与部に線材捩じ
り手段の当接面を当接させてコイルばねをコイル成形繰
り出し方向に押圧するようにしたことを特徴とする請求
項１又は２に記載のコイルばねの切断方法。Acting position of the torsional load applying portion 3. A wire twisting means to the coil spring winding terminal end portion abutting includes a coil spring wound termination before Riho by coil spring wound termination pot half The coil spring is pressed in the coil forming unreeling direction by contacting the contact surface of the wire torsion means with the torsion load applying portion of the wire at the opposed position. 3. The method for cutting a coil spring according to 1 or 2.
前進量が増すに従い巻回されたコイルばねをコイルばね
成形繰り出し方向へ押圧する押圧量が増すように先端部
に傾斜面を有し、該傾斜面のコイルばねに向かう前進位
置を選択的に位置決めすることによって、コイルばね胴
部に所定のピッチの付与とコイルばね巻回終端部の線材
に捩じり荷重の付与とが可能なピッチ工具を用いるよう
にしたことを特徴とする請求項１，２又は３の何れか１
項に記載のコイルばねの切断方法。4. The wire torsion means is tilted at the tip so that the amount of pressing of the wound coil spring in the coil spring forming and feeding direction increases as the amount of advance toward the coil spring increases. A predetermined pitch on the coil spring body and a torsional load on the wire at the end of the coil spring winding by selectively positioning the forward position of the inclined surface toward the coil spring . 4. A pitch tool capable of performing the following: a.
13. The method for cutting a coil spring according to the above section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP35530996A JP3324078B2 (en) | 1996-12-19 | 1996-12-19 | Cutting method of coil spring |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP35530996A JP3324078B2 (en) | 1996-12-19 | 1996-12-19 | Cutting method of coil spring |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH10180384A JPH10180384A (en) | 1998-07-07 |
| JP3324078B2 true JP3324078B2 (en) | 2002-09-17 |
Family
ID=18443173
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP35530996A Expired - Fee Related JP3324078B2 (en) | 1996-12-19 | 1996-12-19 | Cutting method of coil spring |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3324078B2 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100886760B1 (en) | 2007-05-11 | 2009-03-04 | 이재익 | Screw strengthening coil manufacture device |
| DE102013214161B4 (en) * | 2013-07-18 | 2015-05-07 | Wafios Ag | Method and device for producing coil springs by spring winds |
| CN107598034A (en) * | 2017-09-25 | 2018-01-19 | 杭州富春弹簧有限公司 | The combination shearing device and its method of a kind of spring flat nick |
| WO2020161998A1 (en) * | 2019-02-06 | 2020-08-13 | 日本発條株式会社 | Coiling machine, method for manufacturing coil spring, and coil spring |
| CN114589276B (en) * | 2022-03-14 | 2023-08-01 | 杭州弹簧有限公司 | Spring processing equipment |
-
1996
- 1996-12-19 JP JP35530996A patent/JP3324078B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH10180384A (en) | 1998-07-07 |
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