JPH0477657B2 - - Google Patents
Info
- Publication number
- JPH0477657B2 JPH0477657B2 JP25518384A JP25518384A JPH0477657B2 JP H0477657 B2 JPH0477657 B2 JP H0477657B2 JP 25518384 A JP25518384 A JP 25518384A JP 25518384 A JP25518384 A JP 25518384A JP H0477657 B2 JPH0477657 B2 JP H0477657B2
- Authority
- JP
- Japan
- Prior art keywords
- tubular body
- shape memory
- memory alloy
- thermoplastic resin
- shape
- 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
- 229910001285 shape-memory alloy Inorganic materials 0.000 claims description 46
- 238000005452 bending Methods 0.000 claims description 30
- 229920005992 thermoplastic resin Polymers 0.000 claims description 29
- 238000011084 recovery Methods 0.000 claims description 10
- 238000010438 heat treatment Methods 0.000 claims description 7
- 238000003672 processing method Methods 0.000 claims description 2
- 238000000034 method Methods 0.000 description 19
- 230000008569 process Effects 0.000 description 8
- 229910045601 alloy Inorganic materials 0.000 description 5
- 239000000956 alloy Substances 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- KHYBPSFKEHXSLX-UHFFFAOYSA-N iminotitanium Chemical compound [Ti]=N KHYBPSFKEHXSLX-UHFFFAOYSA-N 0.000 description 3
- 229910000734 martensite Inorganic materials 0.000 description 3
- 229910001000 nickel titanium Inorganic materials 0.000 description 3
- 239000004033 plastic Substances 0.000 description 3
- 229920003023 plastic Polymers 0.000 description 3
- 239000004677 Nylon Substances 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 2
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 229920001778 nylon Polymers 0.000 description 2
- 229920006122 polyamide resin Polymers 0.000 description 2
- -1 polypropylene Polymers 0.000 description 2
- 229920001155 polypropylene Polymers 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 229910002056 binary alloy Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000003446 memory effect Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 229910002058 ternary alloy Inorganic materials 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C53/00—Shaping by bending, folding, twisting, straightening or flattening; Apparatus therefor
- B29C53/02—Bending or folding
- B29C53/08—Bending or folding of tubes or other profiled members
- B29C53/083—Bending or folding of tubes or other profiled members bending longitudinally, i.e. modifying the curvature of the tube axis
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Shaping Of Tube Ends By Bending Or Straightening (AREA)
Description
本発明は形状記憶合金を用いて熱可塑性樹脂管
状体を曲げ加工するための方法に関する。
The present invention relates to a method for bending a thermoplastic resin tubular body using a shape memory alloy.
配線用の保護管、液体油送管などに用いられる
管状体として、塩化ビニル、ポリアミド樹脂（商
品名ナイロン）、ポリプロピレン樹脂のごとき比
較的高粘性の熱可塑性樹脂からなるものがある。
通常、このような材質の管状体は、ダイスを備
えた押出成形手段により成形され、これの曲げ加
工に際して、金型を利用した加熱加工、手作業に
依存した加熱加工などが採用される。
Some tubular bodies used in protective pipes for wiring, liquid oil pipes, etc. are made of relatively highly viscous thermoplastic resins such as vinyl chloride, polyamide resin (trade name: nylon), and polypropylene resin. Usually, a tubular body made of such a material is formed by extrusion molding means equipped with a die, and when bending the body, heating processing using a mold, heating processing relying on manual labor, etc. are employed.
金型を利用した加工手段の場合、高価な金型を
要するほか、管状体を曲げ加工するにあたり、こ
れを一本ずつ金型にセツトしなければならないの
で、量産加工に適さない。
手作業に依存した加熱加工は、熟練者の確保が
困難であること、量産性が金型利用の場合よりも
劣ること、曲げ角度のバラツキが大きく、一定品
質のものが得がたいことなど、改善の余地が多分
に残されている。
本発明はこのような技術的課題に鑑み、設備の
簡素化、量産性、均一な加工性をはかることので
きる熱可塑性樹脂管状体の加工方法を提供しよう
とするものである。
In the case of a processing method using a mold, an expensive mold is required, and when bending a tubular body, each tube must be placed in a mold one by one, so it is not suitable for mass production. Heating processing that relies on manual labor has many problems that require improvement, such as difficulty in securing skilled workers, lower mass production than when using molds, and large variations in bending angles, making it difficult to obtain products of consistent quality. There is plenty of room left. In view of these technical problems, the present invention aims to provide a method for processing a thermoplastic resin tubular body that can simplify equipment, facilitate mass production, and achieve uniform processability.
本発明に係る熱可塑性樹脂管状体の加工方法は
所期の目的を達成するために、曲げ形状を記憶し
た後の形状記憶合金を用いて熱可塑性樹脂管状体
を曲げ加工するとき、形状記憶合金を熱可塑性樹
脂管状体の曲げ加工箇所に装着した後、形状記憶
合金を記憶回復温度まで上昇させるとともに、熱
可塑性樹脂管状体の曲げ加工箇所を加熱軟化させ
て、形状記憶合金の形状回復力により、熱可塑性
樹脂管状体の軟化した曲げ加工箇所を曲げること
を特徴とする。
In order to achieve the intended purpose, the method for processing a thermoplastic resin tubular body according to the present invention is such that when bending a thermoplastic resin tubular body using a shape memory alloy that has memorized the bending shape, the shape memory alloy After attaching it to the bending part of the thermoplastic resin tubular body, the shape memory alloy is raised to the memory recovery temperature, and the bending part of the thermoplastic resin tubular body is heated and softened, so that the shape memory alloy's shape recovery force , which is characterized by bending a softened bending part of a thermoplastic resin tubular body.
本発明方法の場合、形状記憶合金を熱可塑性樹
脂管状体の曲げ加工箇所に装着し、形状記憶合金
を記憶回復温度まで上昇させ、かつ、熱可塑性樹
脂管状体の曲げ加工箇所を加熱軟化させる。
こうした場合、熱可塑性樹脂管状体の軟化した
曲げ加工箇所は、塑性変形しやすくなつているの
で、形状記憶合金の形状回復力を受けて曲がる。
かくて、熱可塑性樹脂管状体を曲げ加工した後
は、これを形状記憶合金と共に室温まで冷却（温
度降下）させる。
かかる冷却後、計業記憶合金は、自己の形状回
復機能を消失しているので、外力を受けたときに
用意に変形するが、熱可塑性樹脂管状体は、硬化
しているので、外力を受けても塑性変形しない。
したがつて、形状記憶合金を変形させつつ、こ
れを熱可塑性樹脂管状体の曲げ加工箇所から取り
外す。
In the case of the method of the present invention, a shape memory alloy is attached to a bending portion of a thermoplastic resin tubular body, the shape memory alloy is raised to a memory recovery temperature, and the bending portion of the thermoplastic resin tubular body is heated and softened. In such a case, the softened bending portion of the thermoplastic resin tubular body is susceptible to plastic deformation, and therefore bends under the shape recovery force of the shape memory alloy. Thus, after the thermoplastic resin tubular body is bent, it is cooled (temperature lowered) to room temperature together with the shape memory alloy. After such cooling, the memory alloy loses its shape recovery function, so it easily deforms when subjected to external force, but the thermoplastic resin tubular body is hardened, so it does not deform when subjected to external force. No plastic deformation occurs. Therefore, while deforming the shape memory alloy, it is removed from the bending portion of the thermoplastic resin tubular body.
はじめ、本発明に係る熱可塑性樹脂管状体の加
工方法として、第１図に例示されたものを説明す
る。
第１図Ａ〜Ｅにおいて、１は管状体、２は管状
体１の曲げ加工箇所、３は形状記憶合金をそれぞ
れ示す。
管状体１は、塩化ビニル、ポリアミド樹脂（商
品名ナイロン）、ポリプロピレン樹脂のごとき熱
可塑性樹脂からなり、軸心に貫通した孔４を有し
ている。
形状記憶合金３は、二元系、三元系など、公知
ないし周知の合金からなり、その具体的一例とし
て、形状記憶合金３は、二元系のNi−Ti合金か
らなる。
Ni−Ti合金からなる形状記憶合金３は、熱弾
性マルテンサイト変態により形状記憶効果を奏す
るものであり、マルテンサイト相が母相へ逆変態
するときときの温度が、形状回復する温度とな
る。
二元系形状記憶合金３の場合、マルテンサイト
変態温度は、合金組成のわずかな成分変化で大き
く変化し、形状記憶処理する温度によつても変化
する。
第１図Ａ〜Ｅに例示された実施例の場合、適当
な長さに切断されたNi−Ti合金製の丸線材が、
500℃、約１時間で形状記憶処理されて形状記憶
合金３がつくられ、当該処理後、形状記憶合金３
は室温まで冷却される。
この際、形状記憶合金３が記憶した形状は、自
明のとおり、管状体１に与えるべき曲げ形状であ
り、かかる形状の一例として、第１図のごときＶ
形を記憶している。
第１図Ａに示された工程のとき、所定長さの管
状体１が用意される。
第１図Ｂに示された工程のとき、形状記憶合金
３は、直線状に伸ばされており、かかる形状記憶
合金３が管状体１の孔４に引き通される。
第１図Ｃに示された工程のとき、ヒータを備え
た電気炉、高温の湯、熱風など、任意の加熱手段
を介して管状体１と形状記憶合金３とが加熱され
る。
この際の加熱温度は60〜70℃であり、これは管
状体１が軟化し、形状記憶合金３が形状回復する
温度である。
したがつて、第１図Ｃの工程のとき、形状記憶
合金３の形状回復力により、管状体１は軟化状態
にある曲げ加工箇所２から曲げられる。
第１図Ｄに示された工程のとき、管状体１およ
び形状記憶合金３は、いずれも室温まで温度降下
（冷却）している。
この冷却状態のとき、管状体１は硬化している
ので塑性変形せず、形状記憶合金３は自己の形状
回復機能を消失しているので容易に変形する。
したがつて、第１図Ｄの工程において、同図の
矢印Ｐが示す方向に、形状記憶合金３を管状体１
内から抜きとることができる。
なお、第１図Ｂの工程において管状体１内に形
状記憶合金３と電線とを引き通しておき、以下、
第１図Ｃの工程を経た後、第１図Ｅの工程で形状
記憶合金３のみを管状体１内から同図の矢印Ｐ方
向へ抜きとれば、管状体１内には電線５が残置さ
れる。
このような工程を採用するとき、管状体１の曲
げ加工と、管状体１内への電線内装とが同期して
行なえる。
つぎに、本発明に係る熱可塑性樹脂管状体の加
工方法として、第２図に例示されたものを説明す
る。
第２図Ａ〜Ｄに例示された実施例は、形状記憶
処理された形状記憶合金３ａがコイル巻き形状を
有する点、形状記憶合金３ａが熱可塑性樹脂管状
体１ａの外部に装着される点を除いて、第１図に
例示のものと基本的に同じである。
第２図Ａ〜Ｄの各工程は、以下に略述するごと
く実施される。
第２図Ａの工程において管状体１ａが用意さ
れ、第２図Ｂの工程において形状記憶合金３ａが
管状体１ａの外周（曲げ加工箇所２ａ）に嵌めこ
まれ、第２図Ｃの工程において既述の加熱手段に
より管状体１ａと形状記憶合金３ａとが加熱され
る。
この工程までを経たとき、管状体１ａが軟化す
るとともに、形状記憶合金３ａが形状回復するの
で、軟化した管状体１ａは、形状回復した形状記
憶合金３ａにより、曲げ加工箇所２ａから曲げら
れる。
その後、管状体１ａ、形状記憶合金３ａの冷却
を待つて形状記憶合金３ａを管状体１ａの曲げ加
工箇所２ａから取り外すと、第２図Ｄに示すごと
き管状体１ａが得られる。
First, the method illustrated in FIG. 1 will be described as a method for processing a thermoplastic resin tubular body according to the present invention. In FIGS. 1A to 1E, 1 indicates a tubular body, 2 indicates a bending portion of the tubular body 1, and 3 indicates a shape memory alloy. The tubular body 1 is made of a thermoplastic resin such as vinyl chloride, polyamide resin (trade name: Nylon), or polypropylene resin, and has a hole 4 extending through the axis. The shape memory alloy 3 is made of a known or well-known alloy such as a binary or ternary alloy, and as a specific example, the shape memory alloy 3 is made of a binary Ni-Ti alloy. The shape memory alloy 3 made of a Ni-Ti alloy exhibits a shape memory effect through thermoelastic martensitic transformation, and the temperature at which the martensitic phase reversely transforms into the parent phase is the temperature at which shape recovery occurs. In the case of the binary shape memory alloy 3, the martensitic transformation temperature changes greatly with a slight change in the alloy composition, and also changes with the temperature at which the shape memory treatment is performed. In the case of the embodiment illustrated in FIGS. 1A to 1E, a Ni-Ti alloy round wire cut to an appropriate length is
Shape memory alloy 3 is produced by shape memory treatment at 500°C for about 1 hour, and after the treatment, shape memory alloy 3
is cooled to room temperature. At this time, the shape memorized by the shape memory alloy 3 is, as is obvious, the bending shape to be given to the tubular body 1, and an example of such a shape is a V shape as shown in FIG.
remembers the shape. At the time of the process shown in FIG. 1A, a tubular body 1 of a predetermined length is prepared. At the time of the step shown in FIG. 1B, the shape memory alloy 3 is stretched in a straight line, and the shape memory alloy 3 is drawn through the hole 4 of the tubular body 1. In the step shown in FIG. 1C, the tubular body 1 and the shape memory alloy 3 are heated using any heating means such as an electric furnace equipped with a heater, hot water, hot air, or the like. The heating temperature at this time is 60 to 70°C, which is the temperature at which the tubular body 1 softens and the shape memory alloy 3 recovers its shape. Therefore, in the process shown in FIG. 1C, the tubular body 1 is bent from the bending portion 2 which is in a softened state due to the shape recovery force of the shape memory alloy 3. At the time of the step shown in FIG. 1D, the temperature of both the tubular body 1 and the shape memory alloy 3 has decreased (cooled) to room temperature. In this cooling state, the tubular body 1 is hardened and therefore does not undergo plastic deformation, and the shape memory alloy 3 has lost its shape recovery function and is easily deformed. Therefore, in the process shown in FIG. 1D, the shape memory alloy 3 is placed in the tubular body 1 in the direction indicated by the arrow
It can be extracted from within. In addition, in the process of FIG. 1B, the shape memory alloy 3 and the electric wire are drawn through the tubular body 1, and the following steps are performed.
After going through the step shown in FIG. 1C, if only the shape memory alloy 3 is removed from the tubular body 1 in the direction of arrow P in the same figure in the step shown in FIG. 1E, the electric wire 5 will remain inside the tubular body 1. Ru. When such a process is employed, the bending of the tubular body 1 and the insertion of the electric wire into the tubular body 1 can be performed synchronously. Next, the method illustrated in FIG. 2 will be described as a method for processing a thermoplastic resin tubular body according to the present invention. The embodiment illustrated in FIGS. 2A to 2D has the following points: the shape memory alloy 3a subjected to shape memory treatment has a coil-wound shape, and the shape memory alloy 3a is attached to the outside of the thermoplastic resin tubular body 1a. Except for this, it is basically the same as that illustrated in FIG. Each step of FIGS. 2A to 2D is performed as outlined below. The tubular body 1a is prepared in the process shown in FIG. 2A, the shape memory alloy 3a is fitted onto the outer periphery of the tubular body 1a (bending portion 2a) in the process shown in FIG. The tubular body 1a and the shape memory alloy 3a are heated by the heating means described above. When this process is completed, the tubular body 1a is softened and the shape memory alloy 3a recovers its shape, so that the softened tubular body 1a is bent from the bending part 2a by the shape memory alloy 3a that has recovered its shape. Thereafter, when the tubular body 1a and the shape memory alloy 3a are cooled, the shape memory alloy 3a is removed from the bending portion 2a of the tubular body 1a, thereby obtaining the tubular body 1a as shown in FIG. 2D.
本発明に係る熱可塑性樹脂管状体の加工方法は
つぎのような効果を有する。
加工手段の主体が形状記憶合金であり、これ
をを反復利用することができるので、設備の簡
素化をはかり、熱可塑性樹脂管状体の加工を経
済的に実施することができる。
形状記憶合金を熱可塑性樹脂管状体の曲げ加
工箇所に対して着脱するだけであるので、格別
の加工難度を要せず、管状体として曲げ形状を
有するものを量産加工することができる。
形状記憶合金の記憶形状に依存して熱可塑性
樹脂管状体をに均一に曲げ加工することができ
るから、一定の曲げ形状をもつ管状体の量産に
適する。
The method for processing a thermoplastic resin tubular body according to the present invention has the following effects. Since the processing means is mainly a shape memory alloy and can be used repeatedly, equipment can be simplified and thermoplastic resin tubular bodies can be processed economically. Since the shape memory alloy is simply attached to and removed from the bent portion of the thermoplastic resin tubular body, it is possible to mass-produce tubular bodies having a bent shape without requiring any particular processing difficulty. Since the thermoplastic resin tubular body can be uniformly bent depending on the memorized shape of the shape memory alloy, it is suitable for mass production of tubular bodies having a fixed bending shape.
第１図Ａ〜Ｄは本発明方法の一実施例を工程順
に略示した説明図、第１図Ｅは上記実施例におい
て管状体内に電線を内装する際の要部工程を略示
した説明図、第２図Ａ〜Ｄは本発明方法の他実施
例を工程順に略示した説明図である。
１……熱可塑性樹脂管状体、１ａ……熱可塑性
樹脂管状体、２……管状体の曲げ加工箇所、２ａ
……管状体の曲げ加工箇所、３……形状記憶合
金、３ａ……形状記憶合金、４……管状体の孔。
1A to 1D are explanatory diagrams schematically showing an embodiment of the method of the present invention in the order of steps, and FIG. 1E is an explanatory diagram schematically illustrating the main steps when installing an electric wire inside a tubular body in the above embodiment. , and FIGS. 2A to 2D are explanatory diagrams schematically showing other embodiments of the method of the present invention in the order of steps. 1...Thermoplastic resin tubular body, 1a...Thermoplastic resin tubular body, 2...Bending portion of tubular body, 2a
...bending portion of the tubular body, 3... shape memory alloy, 3a... shape memory alloy, 4... hole of the tubular body.
Claims (1)
て熱可塑性樹脂管状体を曲げ加工するとき、形状
記憶合金を熱可塑性樹脂管状体の曲げ加工箇所に
装着した後、形状記憶合金を記憶回復温度まで上
昇させるとともに、熱可塑性樹脂管状体の曲げ加
工箇所を加熱軟化させて、形状記憶合金の形状回
復力により、熱可塑性樹脂管状体の軟化した曲げ
加工箇所を曲げることを特徴とする熱可塑性樹脂
管状体の加工方法。1 When bending a thermoplastic resin tubular body using a shape memory alloy that has memorized the bending shape, the shape memory alloy is attached to the bending part of the thermoplastic resin tubular body, and then the shape memory alloy is heated to the memory recovery temperature. A thermoplastic resin characterized by heating and softening the bending part of the thermoplastic resin tubular body and bending the softened bending part of the thermoplastic resin tubular body by the shape recovery force of the shape memory alloy. Processing method for tubular bodies.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25518384A JPS61132321A (en) | 1984-12-03 | 1984-12-03 | Method of working thermoplastic resin tubular body |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25518384A JPS61132321A (en) | 1984-12-03 | 1984-12-03 | Method of working thermoplastic resin tubular body |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61132321A JPS61132321A (en) | 1986-06-19 |
| JPH0477657B2 true JPH0477657B2 (en) | 1992-12-09 |
Family
ID=17275186
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP25518384A Granted JPS61132321A (en) | 1984-12-03 | 1984-12-03 | Method of working thermoplastic resin tubular body |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61132321A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3727717A1 (en) * | 1987-08-17 | 1989-03-02 | Mannesmann Ag | Process and bending device for bending small-calibre pipe sections of thermoplastic, in particular for fuel lines, brake lines or hydraulic lines |
-
1984
- 1984-12-03 JP JP25518384A patent/JPS61132321A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61132321A (en) | 1986-06-19 |
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