JPH11151750A - Production of hollow coil spring made of synthetic resin - Google Patents
Production of hollow coil spring made of synthetic resinInfo
- Publication number
- JPH11151750A JPH11151750A JP9337823A JP33782397A JPH11151750A JP H11151750 A JPH11151750 A JP H11151750A JP 9337823 A JP9337823 A JP 9337823A JP 33782397 A JP33782397 A JP 33782397A JP H11151750 A JPH11151750 A JP H11151750A
- Authority
- JP
- Japan
- Prior art keywords
- synthetic resin
- rotary shaft
- semi
- pipe
- molding
- 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.)
- Granted
Links
Landscapes
- Springs (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
- Shaping Of Tube Ends By Bending Or Straightening (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、コイルバネとして
使用される合成樹脂製の中空コイルスプリングの製造方
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 manufacturing a hollow coil spring made of synthetic resin used as a coil spring.
【０００２】[0002]
【従来の技術】従来から、コイルスプリングとしては金
属製のものが広く使用されているが、金属製の螺旋状体
は錆や腐食が生じ易いために、合成樹脂製のコイルスプ
リングが要望されるようになり、本願発明者等もその要
望を満たすために、例えば、特公昭６４−４９００号公
報に記載したような合成樹脂製螺旋状体の製造方法を開
発した。この合成樹脂製螺旋状体の製造方法は、成形回
転軸体の外周面に半溶融状態の断面円形の合成樹脂製線
状素材を所望のピッチでもって螺旋状に巻き付けながら
軸芯方向に移動させると共にその移動途上において硬化
させることを特徴としている。2. Description of the Related Art Conventionally, coil springs made of metal have been widely used. However, coiled springs made of synthetic resin are demanded because metal spirals are susceptible to rust and corrosion. Thus, the present inventors have developed a method for manufacturing a spiral body made of a synthetic resin as described in Japanese Patent Publication No. Sho. In this method of manufacturing a spiral body made of synthetic resin, a wire material made of synthetic resin having a circular cross section in a semi-molten state is spirally wound at a desired pitch on the outer peripheral surface of a molded rotary shaft body and moved in the axial direction. In addition, it is characterized in that it is cured during its movement.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、成形用
回転軸体に半溶融状態の合成樹脂製線状素材を巻き付け
ると、該合成樹脂製線状素材が巻付力により断面が偏平
状に変形する虞れがあって均一な製品を製造することが
困難であるばかりでなく、線状素材では太い素材を用い
て大径のコイルスプリングを製造した場合、材料費が高
騰して不経済であると共に重量が増加して取扱性に問題
点が生じる。また、製品の軽量化を図ると共に大径のコ
イルスプリングを得るには、線状素材に替えて中空の半
溶融樹脂パイプを押出し成形しながら成形用回転軸体に
螺旋状に巻回することも考えられるが、半溶融樹脂パイ
プは大径になればなる程成形用回転軸体に巻き付けた時
に断面が容易に偏平状に変形して製品化することができ
ないという問題点がある。However, when a synthetic resin linear material in a semi-molten state is wound around a molding rotary shaft, the cross section of the synthetic resin linear material is deformed flat by the winding force. Not only is it difficult to manufacture a uniform product due to the danger, but if a large-diameter coil spring is manufactured using a thick wire material, the material cost rises and is uneconomical. The increase in weight causes a problem in handleability. In addition, in order to reduce the weight of the product and obtain a large-diameter coil spring, it is also possible to extrude a hollow semi-molten resin pipe instead of a linear material and spirally wind it around a molding rotary shaft. It is conceivable, however, that the larger the diameter of the semi-molten resin pipe, the more easily the cross section is deformed into a flat shape when wound around the rotary shaft for molding, making it impossible to commercialize the pipe.
【０００４】一方、成形用回転軸体に既製の硬質合成樹
脂製管体を螺旋状に巻き付けた場合、上述したような断
面が偏平になることなく大径のコイルスプリングを得る
ことができるが、既製の硬質合成樹脂製管体を成形用回
転軸体に巻回すると、該合成樹脂製管体はその弾性復元
力によって拡径しようとし、そのため、成形用回転軸体
との間にスリップが生じて軸心方向に移動させることが
できなくなり、また、例え、成形用回転軸体の巻き付け
た合成樹脂製管体を外部から押圧ローラによって成形用
回転軸体に押し付けながら軸心方向に移動させても、成
形用回転軸体から離脱させた際に、スプリングバックが
生じて製品化をすることができなくなるという問題点が
あった。[0004] On the other hand, when a ready-made hard synthetic resin tube is spirally wound around a molding rotary shaft, a large-diameter coil spring can be obtained without the aforementioned cross section becoming flat. When an existing hard synthetic resin tube is wound around a molding rotary shaft, the synthetic resin tube attempts to expand its diameter due to its elastic restoring force, and as a result, a slip occurs with the molding rotary shaft. Can not be moved in the axial direction, and, for example, by moving the synthetic resin tube wound around the molding rotary shaft in the axial direction while being pressed against the molding rotary shaft by a pressing roller from outside. However, there is also a problem that when it is detached from the molding rotary shaft, springback occurs and it becomes impossible to commercialize the product.
【０００５】本発明はこのような問題点に鑑みてなされ
たもので、その目的とするところは断面中空のコイルス
プリングを能率よく且つ確実に製造し得る合成樹脂製中
空コイルスプリングの製造方法を提供するにある。The present invention has been made in view of the above problems, and an object of the present invention is to provide a method for manufacturing a synthetic resin hollow coil spring capable of efficiently and reliably manufacturing a hollow coil spring having a hollow cross section. To be.
【０００６】[0006]
【課題を解決るための手段】上記目的を達成するために
本発明の請求項１に係る合成樹脂製中空コイルスプリン
グの製造方法は、可撓性を有する既製の硬質合成樹脂製
管体に成形ダイから押し出される半溶融状態の合成樹脂
製パイプ体を被覆することによって半溶融合成樹脂被覆
管体を形成し、この半溶融合成樹脂被覆管体を成形用回
転軸体に連続的に供給して該成形用回転軸体の外周面に
螺旋状に巻き付けると共に成形用回転軸体の回転に従っ
て該成形用回転軸体の長さ方向に移動させながら半溶融
合成樹脂被覆管体を硬化させることを特徴とするもので
ある。In order to achieve the above object, a method for manufacturing a synthetic resin hollow coil spring according to claim 1 of the present invention is a method of forming a hollow rigid synthetic resin tubular body having flexibility. A semi-solid synthetic resin coated tube is formed by coating a semi-solid synthetic resin pipe extruded from a die, and the semi-solid synthetic resin coated tube is continuously supplied to a molding rotary shaft. The semi-solid synthetic resin-coated tube is cured while being spirally wound around the outer peripheral surface of the molding rotary shaft and moving in the longitudinal direction of the molding rotary shaft according to the rotation of the molding rotary shaft. It is assumed that.
【０００７】上記請求項１に記載の合成樹脂製中空コイ
ルスプリングの製造方法において、可撓性を有する既製
の合成樹脂製中空管体としては、請求項２に記載したよ
うに蛇腹管を用いることが好ましい。In the method for manufacturing a synthetic resin hollow coil spring according to the first aspect, a bellows tube is used as the flexible synthetic resin hollow tube body as described in the second aspect. Is preferred.
【０００８】[0008]
【作用】押出成形機の成形ダイから半溶融状態の合成樹
脂製パイプ体を押し出す際に、該パイプ体内に内部が中
空の既製の硬質合成樹脂製管体を挿入するように送り込
んでこの硬質合成樹脂製管体を半溶融状態の合成樹脂製
パイプ体によって被覆した半溶融合成樹脂被覆管体を形
成しながら成形用回転軸体上に所定のピッチでもって螺
旋状に巻き付ける。この時、半溶融合成樹脂被覆管体は
その芯体として内装している既製の硬質合成樹脂製管体
によって断面円形状を保持し且つ該硬質合成樹脂製管体
を成形用回転軸上に沿って湾曲変形させながら螺旋状に
巻き付けらて被覆部である半溶融状態の合成樹脂製パイ
プが未硬化の螺旋状体を形成していく。When a semi-molten synthetic resin pipe body is extruded from a molding die of an extrusion molding machine, a hard synthetic resin pipe body having a hollow interior is fed into the pipe body so as to be inserted. While forming a semi-molten synthetic resin-coated tube in which the resin tube is covered with a semi-molten synthetic resin pipe, it is spirally wound at a predetermined pitch on a molding rotary shaft. At this time, the semi-molten synthetic resin-coated tube is maintained in a circular cross-section by a ready-made hard synthetic resin tube which is housed as a core, and the hard synthetic resin tube is moved along the molding rotary shaft. The pipe is wound spirally while being curved and deformed, and the semi-solid synthetic resin pipe, which is the covering portion, forms an uncured spiral body.
【０００９】そして、成形用回転軸体の回転に従って被
覆部が未硬化の螺旋状体は軸心方向に移動し、その移動
中に被覆部の半溶融合成樹脂製パイプ体が硬化する。こ
の硬化を該被覆部が成形用回転軸体に密接した状態で行
わせることにより、硬化した螺旋状体の内周面が成形用
回転軸体の回転によって縮径しようとして該成形用回転
軸体の外周面に固定し、スリップが生じることなく成形
用回転軸体の回転に従って軸心方向に円滑に移動すると
共に後続する被覆部が未硬化の螺旋状体を成形用回転軸
体上に確実に螺旋巻きさせることができるものである。The uncured helical body with the uncovered portion moves in the axial direction in accordance with the rotation of the molding rotary shaft, and the semi-molten synthetic resin pipe of the covered portion is hardened during the movement. This curing is performed in a state in which the coating portion is in close contact with the molding rotary shaft, so that the inner peripheral surface of the hardened spiral body attempts to reduce its diameter by rotation of the molding rotary shaft. And smoothly move in the axial direction according to the rotation of the molding rotary shaft without slipping, and ensure that the subsequent coating portion forms an uncured spiral body on the molding rotary shaft. It can be spirally wound.
【００１０】こうして、成形用回転軸体上で被覆部が硬
化した螺旋状体は成形用回転軸体から送り出されると、
硬化した被覆部によって内部の既製硬質合成樹脂製管体
がスプリングバックするのを阻止された一定径の中空コ
イルスプリングを得ることができるものである。[0010] When the spiral body having the coating portion hardened on the molding rotary shaft is sent out from the molding rotary shaft,
It is possible to obtain a hollow coil spring having a fixed diameter, in which the hard coating portion prevents the internal hard tube made of hard synthetic resin from springing back.
【００１１】[0011]
【発明の実施の形態】本発明の具体的な実施例を図面に
ついて説明すると、図１に示すように、成形用回転軸体
１の後端部（基端部）の一側方に押出成形機２を配設
し、この押出成形機２の成形ダイ３から一定径の断面円
環形状の半溶融状態の合成樹脂製パイプ体４を押し出す
と共に押出成形機２内に背面側から外径が上記半溶融合
成樹脂製パイプ４の外径よりも小径で内径と同等若しく
はやゝ大径の可撓性を有する既製の硬質合成樹脂製蛇腹
管５よりなる中空管体を連続的に供給して成形ダイ３か
ら押し出される半溶融合成樹脂製パイプ４内に挿入する
ことによって既製の硬質合成樹脂製蛇腹管５を芯体と
し、半溶融合成樹脂製パイプ４が芯体の被覆部となった
半溶融合成樹脂被覆管体Ａを形成しながら成形用回転軸
体１に向かって供給する。DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to the drawings, a specific embodiment of the present invention will be described. As shown in FIG. 1, one side of a rear end (base end) of a molding rotary shaft 1 is extrusion-molded. The extruder 2 is provided with an extruder 2 and a semi-molten synthetic resin pipe 4 having a constant diameter and a circular cross section is extruded from a forming die 3 and the outer diameter of the extruder 2 from the rear side is increased. A hollow tubular body made of a pre-made rigid synthetic resin bellows tube 5 having a diameter smaller than the outer diameter of the semi-solid synthetic resin pipe 4 and having a flexibility equal to or slightly larger than the inner diameter is continuously supplied. By inserting into a semi-solid synthetic resin pipe 4 extruded from the molding die 3, a ready-made hard synthetic resin bellows tube 5 was used as a core body, and the semi-solid synthetic resin pipe 4 became a covering part of the core body. While forming the semi-solid synthetic resin-coated tube A, it is supplied toward the rotary shaft 1 for molding. .
【００１２】この半溶融合成樹脂被覆管体Ａの形成時に
おいて、成形ダイ３内でその半溶融合成樹脂製パイプ４
内に硬質合成樹脂製蛇腹管５が挿入された時に、半溶融
合成樹脂製パイプ４の内層部分が図２に示すように、長
さ方向に連続凹凸状に屈曲した硬質合成樹脂製蛇腹管５
の凹部内に充満した状態となる。即ち、半溶融合成樹脂
製パイプ４の外周面は全長に亘って同一径であるがその
厚みは既製の硬質合成樹脂製蛇腹管５の凹部では厚く、
凸部では薄く被覆した状態となっている。At the time of forming the semi-solid synthetic resin coated tube A, the semi-solid synthetic resin pipe 4
When the hard synthetic resin bellows tube 5 is inserted into the inside, the hard synthetic resin bellows tube 5 whose inner layer portion of the semi-molten synthetic resin pipe 4 is bent in a continuous uneven shape in the length direction as shown in FIG.
Is filled in the recess. That is, the outer peripheral surface of the semi-molten synthetic resin pipe 4 has the same diameter over the entire length, but the thickness thereof is large in the concave portion of the ready-made hard synthetic resin bellows tube 5,
The projection is in a state of being covered thinly.
【００１３】この半溶融合成樹脂被覆管体Ａを成形用回
転軸体１に対して一側方から該成形用回転軸体１上にそ
の芯体を形成している既製の硬質合成樹脂製蛇腹管５を
湾曲させながら所定のピッチでもって螺旋状に巻き付け
て被覆部が未硬化の中空螺旋状体A1を形成する。この
際、芯体を形成している既製の硬質合成樹脂製中空管体
は可撓性を有する蛇腹管からなるので、半溶融合成樹脂
被覆管体Ａを断面円環状に保持しながら成形用回転軸体
１上に周方向に容易に湾曲して巻回させることができ
る。なお、成形用回転軸体１は後述するように、半溶融
合成樹脂被覆管体Ａを巻き取る方向に回転していると共
に巻回した中空螺旋状体A1を軸心方向に移動させるよう
に構成している。The semi-solid synthetic resin-coated tubular body A is made of a hard-resin bellows made of a hard synthetic resin, the core of which is formed on one side of the rotary shaft 1 for molding. The tube 5 is spirally wound at a predetermined pitch while being curved, to form a hollow spiral body A1 having an uncured coating portion. At this time, the hollow tube made of the hard synthetic resin, which is already formed, forming the core is made of a bellows tube having flexibility. It can be easily curved and wound around the rotating shaft 1 in the circumferential direction. In addition, the rotating shaft 1 for molding is configured to rotate in the direction of winding up the semi-molten synthetic resin coated tube A and move the wound hollow spiral body A1 in the axial direction, as described later. doing.
【００１４】このように、半溶融合成樹脂被覆管体Ａを
成形用回転軸体１に螺旋状に巻回させて被覆部が未硬化
の中空螺旋状体A1を形成していくと共に成形用回転軸体
１の回転に従って該中空螺旋状体A1を成形用回転軸体１
の軸心方向に前進移動させ、その移動中に中空螺旋状体
A1の被覆部を形成している半溶融合成樹脂製パイプ４を
硬化させると、螺旋状に湾曲した既製の硬質合成樹脂製
蛇腹管５の外周面に該合成樹脂製パイプ４が一体的に固
着した中空コイルスプリングA2が得られる。As described above, the semi-molten synthetic resin coated tube A is spirally wound around the molding rotary shaft 1 to form a hollow spiral A1 having an uncured coating portion, and the molding rotary shaft A is rotated. According to the rotation of the shaft 1, the hollow spiral body A1 is formed into a rotating shaft 1 for molding.
Moving forward in the axial direction of the hollow spiral
When the semi-molten synthetic resin pipe 4 forming the coating portion of A1 is cured, the synthetic resin pipe 4 is integrally fixed to the outer peripheral surface of a helically curved prefabricated hard synthetic resin bellows tube 5. The obtained hollow coil spring A2 is obtained.
【００１５】半溶融合成樹脂製パイプ４が硬化すると、
芯体である既製の硬質合成樹脂製蛇腹管５がこの硬質合
成樹脂製蛇腹管５を被覆している硬化した合成樹脂製パ
イプによって成形用回転軸体１の外周面に沿って一定径
の螺旋巻きした状態で固定され、硬質合成樹脂製蛇腹管
５の弾性復元力によって中空コイルスプリングA2全体を
拡径させることはなく、被覆部が硬化した中空コイルス
プリングA2の内周面が成形用回転軸体１上に密接した状
態となる。When the semi-solid synthetic resin pipe 4 hardens,
A core of a pre-made rigid synthetic resin bellows tube 5 is formed by a hardened synthetic resin pipe covering the hard synthetic resin bellows tube 5 and a spiral having a constant diameter is formed along the outer peripheral surface of the molding rotary shaft 1. The entire hollow coil spring A2 is fixed in a wound state and does not expand the entire diameter of the hollow coil spring A2 by the elastic restoring force of the bellows tube 5 made of hard synthetic resin. The body 1 is in close contact with the body.
【００１６】従って、成形用回転軸体１の回転により中
空コイルスプリングA2が成形用回転軸体１を締め付ける
方向、即ち、縮径方向に引き付けられながら成形用回転
軸体１と一体的に回転しながら成形用回転軸体１上を前
進し、その前進によって被覆部が未硬化の後続する螺旋
状体A1を引き寄せるので、この未硬化の螺旋状体A1を介
して半溶融合成樹脂被覆管体Ａを押出成形機２から引き
出すようにしながら成形用回転軸体１上に連続的に螺旋
巻きすることができる。なお、螺旋状体A1の被覆部を硬
化させる際に、その硬化直後の螺旋状体、即ちコイルス
プリングA2の内周面を成形用回転軸体１上に積極的に押
接させる押圧ローラを成形用回転軸体１の外周方に配設
しておいてもよい。Accordingly, the hollow coil spring A2 rotates integrally with the molding rotary shaft 1 while being pulled in the direction of tightening the molding rotary shaft 1 by the rotation of the molding rotary shaft 1, that is, in the diameter reducing direction. While moving forward on the rotary shaft 1 for molding, the coating portion draws the subsequent uncured helical body A1 by the advance, so that the semi-molten synthetic resin coated tube A is passed through the uncured helical body A1. Can be continuously spirally wound on the molding rotary shaft 1 while being pulled out from the extruder 2. When the coating portion of the spiral body A1 is cured, a pressing roller that positively presses the spiral body immediately after the curing, that is, the inner peripheral surface of the coil spring A2, on the molding rotary shaft body 1 is formed. May be arranged on the outer periphery of the rotary shaft body 1 for use.
【００１７】こうして、成形用回転軸体１上で被覆部で
ある半溶融合成樹脂製パイプ４を硬化させることによっ
て芯体である既製の硬質合成樹脂製蛇腹管５が一定径で
もって固定されてなる中空コイルスプリングA2を形成す
ることができると共に該硬質合成樹脂製蛇腹管５の外周
面に一体的に硬化した合成樹脂製パイプ４よりなる被覆
樹脂によって硬質合成樹脂製蛇腹管５の可撓性がなくな
り、所定のスプリング力を発揮するコイルスプリングA2
が形成されるものであり、このコイルスプリングA2を成
形用回転軸体１の前端から前方に送り出すと共に所望長
さ送り出される毎にカッタ（図示せず）により切断して
スプリングバックの生じる虞れのない所定長さの一定径
の中空コイルスプリングを得るものである。In this way, by curing the semi-molten synthetic resin pipe 4 which is the covering portion on the molding rotary shaft 1, the pre-made hard synthetic resin bellows tube 5 which is the core is fixed with a constant diameter. And the flexibility of the hard synthetic resin bellows tube 5 is formed by a coating resin made of a synthetic resin pipe 4 that is integrally hardened on the outer peripheral surface of the hard synthetic resin bellows tube 5. Coil spring A2 that exerts the specified spring force
The coil spring A2 is sent forward from the front end of the molding rotary shaft body 1 and is cut by a cutter (not shown) every time the coil spring A2 is sent out to a desired length. Thus, a hollow coil spring having a predetermined diameter and a predetermined diameter is obtained.
【００１８】なお、以上の実施例においては、半溶融合
成樹脂製パイプ４内に挿入する既製の合成樹脂製管体と
して蛇腹管５を用いたが、蛇腹管でなくても図３に示す
ように、可撓性と保形性を備えた合成樹脂製中空管体5'
であればよい。また、成形ダイ３から押し出される半溶
融合成樹脂製パイプ４やこの半溶融合成樹脂製パイプ４
内に挿入する既製の硬質合成樹脂製管体としては、硬質
塩化ビニル、ポリエチレン、ポリプロピレン等の適宜な
硬質合成樹脂からなるものであればよい。この場合、上
述したように既製の硬質合成樹脂製蛇腹管５を用いる
と、該蛇腹管の連続凹凸状に屈曲した凹部内に半溶融合
成樹脂製パイプ４の内層部分が充満した状態で硬化する
ので、硬質合成樹脂製蛇腹管５と半溶融合成樹脂製パイ
プ４とが互いに接着し難い合成樹脂からなるものであっ
ても一体化した中空コイルスプリングA2を形成すること
ができる。In the above embodiment, the bellows tube 5 is used as a ready-made synthetic resin tube inserted into the semi-molten synthetic resin pipe 4, but as shown in FIG. In addition, a synthetic resin hollow tube 5 ′ having flexibility and shape retention
Should be fine. Further, the semi-solid synthetic resin pipe 4 extruded from the molding die 3 and the semi-solid synthetic resin pipe 4
The ready-made rigid synthetic resin tube inserted into the inside may be made of a suitable hard synthetic resin such as hard vinyl chloride, polyethylene, or polypropylene. In this case, when the hard synthetic resin bellows tube 5 already manufactured is used as described above, the hardening is performed in a state where the inner layer portion of the semi-molten synthetic resin pipe 4 is filled in the concave portion of the bellows tube bent continuously. Therefore, even if the bellows tube 5 made of a hard synthetic resin and the pipe 4 made of a semi-molten synthetic resin are made of a synthetic resin that is difficult to adhere to each other, an integrated hollow coil spring A2 can be formed.
【００１９】上記合成樹脂製中空コイルスプリングの製
造装置としては図１に示すように、回転駆動機構を内蔵
している機枠10に複数本の成形用回転軸11を仮想円柱上
に一定間隔毎に配置することによって構成した上記成形
用回転軸体１の基端（後端）を回転自在に支持させてな
り、各成形用回転軸11は仮想円柱の軸心に対して同一方
向に同一角度だけやゝしていてこれらの成形用回転軸11
を同一方向に一斉回転させることにより成形用回転軸体
１上に供給される上記半溶融合成樹脂被覆管体Ａを所定
の螺旋ピッチでもって巻回させると共に巻回した螺旋状
体A1を成形用回転軸体１の軸心方向に移動させるように
構成している。As shown in FIG. 1, a plurality of molding rotary shafts 11 are mounted on a virtual cylinder at regular intervals on a machine frame 10 having a built-in rotary drive mechanism. The rotatable base end (rear end) of the rotary shaft 1 for molding formed by arranging the rotary shafts 11 is rotatable, and the rotary shafts 11 for forming are formed at the same angle in the same direction with respect to the axis of the virtual cylinder. These molding rotary shafts 11
Are simultaneously rotated in the same direction, thereby winding the semi-solid synthetic resin coated tube A supplied onto the rotary shaft 1 for molding at a predetermined spiral pitch and forming the spirally wound spiral A1. The rotary shaft 1 is configured to be moved in the axial direction.
【００２０】成形用回転軸体１を構成する各成形用回転
軸11はその基端部が自在継手12を介して上記機枠10に径
方向に移動自在に配設した軸受13に回転自在に支持され
ていると共に機枠内に配設している自在継手14を有する
短軸15を介して駆動モータ16により同一方向に一斉に回
転させられる噛合歯車の各歯車23に連結している。さら
に、上記仮想円柱の軸心に支軸17を配設してこの支軸17
の基端部を機枠10に支持させていると共に該支軸17の基
端部と先端部とに螺子機構18を操作することによって前
後方向に移動させられる摺動片19、20を被嵌してあり、
各成形用回転軸11の基端軸受13と後部摺動片19とを連結
杆21によって連結すると共に先端軸受部と前部摺動片20
とを同じく連結杆22によって連結している。また、前部
摺動片20は支軸17回りに回動、固定自在に構成されてい
る。Each forming rotary shaft 11 constituting the forming rotary shaft 1 is rotatably mounted on a bearing 13 whose base end is movably arranged in a radial direction on the machine frame 10 via a universal joint 12. It is connected to respective gears 23 of meshing gears which are simultaneously rotated in the same direction by a drive motor 16 via a short shaft 15 having a universal joint 14 supported and arranged in the machine frame. Further, a support shaft 17 is arranged on the axis of the virtual cylinder, and
Are supported by the machine frame 10 and slide pieces 19 and 20 which are moved in the front-rear direction by operating the screw mechanism 18 on the base end and the front end of the support shaft 17 are fitted. Have been
The base bearing 13 and the rear sliding piece 19 of each forming rotary shaft 11 are connected by a connecting rod 21 and the front bearing part and the front sliding piece 20 are connected.
Are also connected by a connecting rod 22. Further, the front sliding piece 20 is configured to be rotatable and fixed around the support shaft 17.
【００２１】このように構成したので、上記螺子機構18
を回動操作することによって前後摺動片19、20を支軸17
上で前後移動させると、連結杆21、22を介して全ての成
形用回転軸11が径方向に移動して成形用回転軸体１の径
（上記仮想円柱）が大小に変化し、従って、製造すべき
合成樹脂製中空コイルスプリングA2の径を変更すること
ができる。また、前部摺動片20を支軸17回りに所望角度
回動させると、各成形用回転軸11の基端側から先端側に
向かう円周方向に傾斜角度が変化し、製造すべき合成樹
脂製中空コイルスプリングA2の螺旋ピッチを変更するこ
とができる。With such a configuration, the screw mechanism 18
Is rotated to move the front and rear sliding pieces 19 and 20 around the support shaft 17.
When it is moved back and forth above, all the forming rotary shafts 11 move in the radial direction via the connecting rods 21 and 22, and the diameter (the virtual cylinder) of the forming rotary shaft 1 changes to a large or small size. The diameter of the synthetic resin hollow coil spring A2 to be manufactured can be changed. Further, when the front slide piece 20 is rotated by a desired angle around the support shaft 17, the inclination angle changes in the circumferential direction from the base end side to the tip end side of each forming rotary shaft 11, and the composite to be manufactured is changed. The helical pitch of the resin hollow coil spring A2 can be changed.
【００２２】なお、この製造装置によれば、直径が１メ
ートル以上の合成樹脂製中空コイルスプリングを容易に
製造することができる。この中空コイルスプリングはそ
の径や強度、弾発力等に応じて上記半溶融合成樹脂製パ
イプ４及び硬質合成樹脂製蛇腹管５の径や肉厚を適宜変
更すればよい。According to this manufacturing apparatus, a synthetic resin hollow coil spring having a diameter of 1 meter or more can be easily manufactured. In this hollow coil spring, the diameter and thickness of the semi-solid synthetic resin pipe 4 and the hard synthetic resin bellows pipe 5 may be appropriately changed according to the diameter, strength, elasticity, and the like.
【００２３】また、上記のような製造装置を用いること
なく、例えば、一定径を有する軸体の周面に螺旋送り方
向に回転する複数本の長尺ローラを周方向に所定間隔毎
に配設してこれらの長尺ローラ上に上記半溶融合成樹脂
被覆管体Ａを螺旋巻きしてもよく、或いは、回転軸を軸
心方向に移動させながらこの回転軸上に半溶融合成樹脂
被覆管体Ａを螺旋巻きすることによって中空コイルスプ
リングを形成してもよい。Also, without using the above-mentioned manufacturing apparatus, for example, a plurality of long rollers rotating in a spiral feed direction are arranged at predetermined intervals in a circumferential direction on a circumferential surface of a shaft having a constant diameter. Then, the semi-solid synthetic resin coated tube A may be spirally wound on these long rollers, or the semi-solid synthetic resin coated tube may be wound on the rotary shaft while moving the rotary shaft in the axial direction. A hollow coil spring may be formed by spirally winding A.
【００２４】[0024]
【発明の効果】以上のように本発明の合成樹脂製中空コ
イルスプリングの製造方法によれば、可撓性を有する既
製の硬質合成樹脂製管体に成形ダイから押し出される半
溶融状態の合成樹脂製パイプ体を被覆することによって
半溶融合成樹脂被覆管体を形成し、この半溶融合成樹脂
被覆管体を成形用回転軸体に連続的に供給して該成形用
回転軸体の外周面に螺旋状に巻き付けると共に成形用回
転軸体の回転に従って該成形用回転軸体の長さ方向に移
動させながら半溶融合成樹脂被覆管体を硬化させること
を特徴とするものであるから、半溶融合成樹脂被覆管体
を成形用回転軸体に螺旋巻き付ける際にその内部の既製
の硬質合成樹脂製管体により確実に断面を円環状に保持
された状態で精度のよく螺旋巻きすることができ、さら
に、成形用回転軸体上を移動しながらこの硬質合成樹脂
製管体を被覆している半溶融状態の合成樹脂製パイプを
硬化させることによって、内部の上記既製硬質合成樹脂
製管体がスプリングバックしようとするのを阻止した状
態で一定径の合成樹脂製中空コイルスプリングとして固
定することができるものである。As described above, according to the method for manufacturing a synthetic resin hollow coil spring of the present invention, a semi-molten synthetic resin extruded from a molding die into a flexible hard synthetic resin tube. A semi-solid synthetic resin-coated tube is formed by coating a pipe made of a semi-solid synthetic resin, and the semi-solid synthetic resin-coated tube is continuously supplied to a rotary shaft for molding to form an outer peripheral surface of the rotary shaft for molding. The method is characterized in that the semi-solid synthetic resin coated tube is cured while being spirally wound and moving in the longitudinal direction of the molding rotary shaft according to the rotation of the molding rotary shaft, so that the semi-solid synthetic resin is cured. When the resin-coated tube is spirally wound around the rotary shaft for molding, it can be accurately spirally wound in a state in which the cross section is reliably held in an annular shape by the already-made hard synthetic resin tube inside, and , Rotary shaft for molding Prevents the above-mentioned hard plastic resin tube inside from trying to spring back by hardening the semi-molten synthetic resin pipe covering this hard plastic resin tube while moving up. In this state, it can be fixed as a synthetic resin hollow coil spring having a constant diameter.
【００２５】このように、内部が中空の合成樹脂製コイ
ルスプリングを精度よく製造することができると共に成
形用回転軸体の径やこの径に応じて半溶融合成樹脂被覆
管体を構成する既製の硬質合成樹脂製管体と半溶融合成
樹脂製パイプとの径及び肉厚を変更することによって50
cm以上の大径の合成樹脂製中空コイルスプリングを能率
よく製造することができるものであり、しかも、コイル
スプリングが中空であるから材料費の節減を図ることは
できるのは勿論、軽量にして取扱いが容易となり、錆や
腐食の生じない大径の合成樹脂製中空コイルスプリング
として種々の用途に使用することができるものである。In this way, a synthetic resin coil spring having a hollow inside can be manufactured with high precision, and a ready-made semi-molten synthetic resin-coated tubular body can be formed according to the diameter of the molding rotary shaft and this diameter. By changing the diameter and thickness of the hard synthetic resin pipe and semi-solid plastic pipe
It can efficiently manufacture hollow coil springs made of synthetic resin with a large diameter of more than 1 cm. In addition, since the coil springs are hollow, material costs can be reduced, and of course, they can be made lightweight and handled. Therefore, it can be used for various applications as a large-diameter synthetic resin hollow coil spring that does not cause rust or corrosion.
【００２６】また、請求項２に係る発明によれば、上記
可撓性を有する既製の硬質合成樹脂製管体は蛇腹管より
なるので、この硬質合成樹脂製蛇腹管を半溶融合成樹脂
製パイプによって被覆してなる半溶融合成樹脂被覆管体
の可撓性が良好となってその断面形状を保形した状態で
成形用回転軸体に対する螺旋巻きが容易に且つ能率よく
行えるものであり、その上、被覆している半溶融合成樹
脂製パイプが硬化すると、この硬化した合成樹脂パイプ
と既製の硬質合成樹脂製蛇腹管とが一体化して該硬質合
成樹脂製蛇腹管の可撓性が消され、所望のスプリング力
を発揮する合成樹脂製中空コイルスプリングを得ること
ができる。According to the second aspect of the present invention, since the above-mentioned flexible hard-made synthetic resin tubular body is made of a bellows tube, the hard synthetic resin bellows tube is made of a semi-molten synthetic resin pipe. The flexibility of the semi-solid synthetic resin coated tube formed by the coating is improved, and the spiral winding around the forming rotary shaft can be easily and efficiently performed in a state where the cross-sectional shape is maintained. When the covered semi-solid synthetic resin pipe is hardened, the hardened synthetic resin pipe is integrated with the existing hard synthetic resin bellows pipe, and the flexibility of the hard synthetic resin bellows pipe is erased. Thus, a synthetic resin hollow coil spring exhibiting a desired spring force can be obtained.
【図１】合成樹脂製中空螺旋状体を製造している状態の
簡略縦断側面図、FIG. 1 is a simplified longitudinal side view of a state in which a synthetic resin hollow spiral body is manufactured.
【図２】半溶融合成樹脂被覆管体の一部の切欠斜視図、FIG. 2 is a partially cutaway perspective view of a semi-solid synthetic resin-coated tube;
【図３】別な構造を有する半溶融合成樹脂被覆管体の一
部の斜視図、FIG. 3 is a perspective view of a part of a semi-solid synthetic resin coated tube having another structure,
【図４】得られた中空コイルスプリングの一部の側面
図。FIG. 4 is a side view of a part of the obtained hollow coil spring.
【符号の説明】 １ 成形用回転軸体 ２ 押出成形機 ３ 成形ダイ ４ 半溶融合成樹脂製パイプ ５ 硬質合成樹脂製蛇腹管 Ａ 半溶融合成樹脂被覆管体 A2 合成樹脂製中空コイルスプリング[Description of Signs] 1 Rotating shaft body for molding 2 Extruder 3 Molding die 4 Pipe made of semi-molten synthetic resin 5 Bellows pipe made of hard synthetic resin A Semi-molten synthetic resin coated pipe A2 Synthetic resin hollow coil spring
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 ＦＩ Ｂ２９Ｌ 23:00 31:00 ──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. 6 Identification code FI B29L 23:00 31:00
Claims (2)
体に成形ダイから押し出される半溶融状態の合成樹脂製
パイプ体を被覆することによって半溶融合成樹脂被覆管
体を形成し、この半溶融合成樹脂被覆管体を成形用回転
軸体に連続的に供給して該成形用回転軸体の外周面に螺
旋状に巻き付けると共に成形用回転軸体の回転に従って
該成形用回転軸体の長さ方向に移動させながら半溶融合
成樹脂被覆管体を硬化させることを特徴とする合成樹脂
製中空コイルスプリングの製造方法。1. A semi-solid synthetic resin coated tube is formed by coating a semi-solid synthetic resin pipe extruded from a forming die onto a flexible hard synthetic resin tube. The semi-solid synthetic resin coated tube is continuously supplied to the rotary shaft for molding and spirally wound around the outer peripheral surface of the rotary shaft for molding, and the rotary shaft for molding is formed according to the rotation of the rotary shaft for molding. A method for manufacturing a synthetic resin hollow coil spring, comprising curing a semi-molten synthetic resin coated tube while moving in a longitudinal direction.
製管体は、蛇腹管であることを特徴とする請求項１に記
載の合成樹脂製中空コイルスプリングの製造方法。2. The method of manufacturing a synthetic resin hollow coil spring according to claim 1, wherein the flexible rigid synthetic resin pipe body is a bellows pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33782397A JP3868086B2 (en) | 1997-11-21 | 1997-11-21 | Method for producing synthetic resin hollow coil spring |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33782397A JP3868086B2 (en) | 1997-11-21 | 1997-11-21 | Method for producing synthetic resin hollow coil spring |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH11151750A true JPH11151750A (en) | 1999-06-08 |
| JP3868086B2 JP3868086B2 (en) | 2007-01-17 |
Family
ID=18312305
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP33782397A Expired - Fee Related JP3868086B2 (en) | 1997-11-21 | 1997-11-21 | Method for producing synthetic resin hollow coil spring |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3868086B2 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008065770A1 (en) * | 2006-11-28 | 2008-06-05 | Sumitomo Wiring Systems, Ltd. | Electric-wire holder |
| CN102205644A (en) * | 2011-04-13 | 2011-10-05 | 苏芳 | Method for producing plastic pipe fitting and special variable mould thereof |
| CN103057109A (en) * | 2012-12-20 | 2013-04-24 | 昆山三多乐电子有限公司 | Spring automatic coiling device |
| US8490530B2 (en) | 2011-11-23 | 2013-07-23 | Hyundai Motor Company | Plastic composite spring for vehicle suspension and apparatus and method for manufacturing the same |
| CN104864027A (en) * | 2015-04-20 | 2015-08-26 | 苏州经贸职业技术学院 | Hydraulic type rigidity-changeable spiral spring |
-
1997
- 1997-11-21 JP JP33782397A patent/JP3868086B2/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008065770A1 (en) * | 2006-11-28 | 2008-06-05 | Sumitomo Wiring Systems, Ltd. | Electric-wire holder |
| CN102205644A (en) * | 2011-04-13 | 2011-10-05 | 苏芳 | Method for producing plastic pipe fitting and special variable mould thereof |
| US8490530B2 (en) | 2011-11-23 | 2013-07-23 | Hyundai Motor Company | Plastic composite spring for vehicle suspension and apparatus and method for manufacturing the same |
| DE102012202625B4 (en) * | 2011-11-23 | 2020-12-17 | Hyundai Motor Company | Corrugated spring made of a plastic composite material for a vehicle suspension and apparatus and method for manufacturing the same |
| CN103057109A (en) * | 2012-12-20 | 2013-04-24 | 昆山三多乐电子有限公司 | Spring automatic coiling device |
| CN104864027A (en) * | 2015-04-20 | 2015-08-26 | 苏州经贸职业技术学院 | Hydraulic type rigidity-changeable spiral spring |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3868086B2 (en) | 2007-01-17 |
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