JPH0412207B2 - - Google Patents
Info
- Publication number
- JPH0412207B2 JPH0412207B2 JP60013177A JP1317785A JPH0412207B2 JP H0412207 B2 JPH0412207 B2 JP H0412207B2 JP 60013177 A JP60013177 A JP 60013177A JP 1317785 A JP1317785 A JP 1317785A JP H0412207 B2 JPH0412207 B2 JP H0412207B2
- Authority
- JP
- Japan
- Prior art keywords
- tube
- axial direction
- extrusion
- along
- extruded
- 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 - Lifetime
Links
- 238000000465 moulding Methods 0.000 claims description 18
- 238000001125 extrusion Methods 0.000 claims description 15
- 230000002093 peripheral effect Effects 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 8
- 230000000694 effects Effects 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000000071 blow moulding Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000009751 slip forming Methods 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
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/0015—Making articles of indefinite length, e.g. corrugated tubes
- B29C49/0021—Making articles of indefinite length, e.g. corrugated tubes using moulds or mould parts movable in a closed path, e.g. mounted on movable endless supports
-
- 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
- B29C2949/00—Indexing scheme relating to blow-moulding
- B29C2949/07—Preforms or parisons characterised by their configuration
- B29C2949/074—Preforms or parisons characterised by their configuration having ribs or protrusions
-
- 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
- B29C2949/00—Indexing scheme relating to blow-moulding
- B29C2949/07—Preforms or parisons characterised by their configuration
- B29C2949/074—Preforms or parisons characterised by their configuration having ribs or protrusions
- B29C2949/0741—Preforms or parisons characterised by their configuration having ribs or protrusions longitudinal, e.g. from top to bottom
-
- 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
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/02—Combined blow-moulding and manufacture of the preform or the parison
- B29C49/04—Extrusion blow-moulding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2023/00—Tubular articles
- B29L2023/18—Pleated or corrugated hoses
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Rigid Pipes And Flexible Pipes (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、屋内配線に用いられる電線管等、周
壁が軸芯方向に沿つた波形に形成されている蛇腹
管をブロー成形する方法で、詳しくは、押出機の
内外二重管の間の環状口から軟化状態のチユーブ
をその軸芯方向に沿つて押出し成形するとともに
前記内管から押出しチユーブ内に空気を吹込んで
この押出チユーブを径方向に膨張させ乍ら、内周
面をその軸芯方向に沿つた波形凹凸面とした成形
ユニツトの複数を無端状に連結して構成されてい
て、前記押出機からのチユーブ押出箇所において
押出チユーブと同芯に位置する状態でチユーブ押
出方向に沿つて移動しつつ押出チユーブの膨張に
伴なつてチユーブの周壁を軸芯方向に沿つた波形
に形成する筒状の成形型を構成するように回動移
動自在な二つの成形帯を回動移動させることによ
り、周壁が軸芯方向に沿つた波形の蛇腹管を成形
する方法に関する。[Detailed Description of the Invention] [Industrial Application Field] The present invention is a method for blow-molding a bellows tube, such as a conduit tube used for indoor wiring, whose peripheral wall is formed in a corrugated shape along the axial direction. Specifically, a softened tube is extruded along the axial direction from the annular opening between the inner and outer double tubes of the extruder, and air is blown into the extruded tube from the inner tube to form the extruded tube in the radial direction. It is constructed by connecting a plurality of molding units in an endless manner, each of which has an inner circumferential surface with a corrugated surface along its axial direction, and is connected to the extrusion tube at the point where the tube is extruded from the extruder. While moving along the tube extrusion direction while being located concentrically, as the extrusion tube expands, it rotates to form a cylindrical mold that forms the circumferential wall of the tube into a corrugated shape along the axial direction. The present invention relates to a method of molding a corrugated bellows tube whose peripheral wall is axially oriented by rotating two movable molding bands.
蛇腹管を補強、特に、耐曲げ強度を増大する
に、従来においては、第４図に示すように、各成
形ユニツト７Ａの内周面に軸芯方向に沿つた凹溝
８′を形成して、蛇腹管に半径方向外方に突出す
る突条を膨出成形する手段が採用されていた。
In order to reinforce the bellows tube, in particular to increase its bending strength, conventionally, as shown in FIG. , a method was adopted in which a bellows tube was formed with a protrusion that protruded outward in the radial direction.
しかし乍ら、前記従来手段によるときは、成形
ユニツト内周面に、蛇腹管の周壁を軸芯方向に沿
つた波形に成形するための波形凹凸に加えて、突
条形成用の凹溝を形成しなければならないことに
よつて、成形ユニツト内周面加工が複雑で、か
つ、手数のかかるものとなつて、成形ユニツトの
作製費が高騰し、蛇腹管の成形コストが補強のた
めに不当にアツプする。
However, when using the above-mentioned conventional means, in addition to the wave-shaped unevenness for shaping the peripheral wall of the bellows tube into a wave shape along the axial direction, grooves for forming protrusions are formed on the inner circumferential surface of the forming unit. As a result, the processing of the inner circumferential surface of the forming unit becomes complicated and time-consuming, the manufacturing cost of the forming unit increases, and the forming cost of the bellows tube increases unreasonably due to reinforcement. rise.
本発明の目的は、安価に補強蛇腹管を成形する
ことができる成形方法を提供する点にある。 An object of the present invention is to provide a method of forming a reinforced bellows tube at low cost.
本発明による蛇腹管成形方法の特徴は、前記内
管の外周面に凹部を形成して、押出チユーブの内
周面に軸芯方向に沿つた突条を一連一体の状態に
形成する点にあり、それによる作用効果は次の通
りである。
The bellows tube forming method according to the present invention is characterized in that a concave portion is formed on the outer circumferential surface of the inner tube, and a series of protrusions extending in the axial direction are formed integrally on the inner circumferential surface of the extruded tube. , the effects thereof are as follows.
つまり、内管に形成した凹部からの押出しによ
り、蛇腹管の内周面に軸芯方向に沿う補強用突条
を形成させるから、成形ユニツトの内周面には、
蛇腹管周壁を波形に成形するための波形凹凸のみ
を形成するだけで良く、成形ユニツトの作製費を
安くできる。しかも、内管に凹部のみを単独に形
成すれば良いから、この内管への凹部形成を、例
えば、成形ユニツトの内周面に波形凹凸と突条用
凹溝とを形成する場合に比較して容易、安価に行
なえる。その上、内管に形成した凹部からの押出
しにより突条を形成するから、突条形成部におい
て蛇腹管周壁の肉厚を増すことができ、これによ
つて、強度の割には突条を小さくでき、内周面に
突条を形成するものの、蛇腹管の内部を電線の挿
通等に便利なように可及的、広くすることができ
る。
That is, by extrusion from the recess formed in the inner tube, reinforcing protrusions along the axial direction are formed on the inner circumferential surface of the bellows tube, so that the inner circumferential surface of the molding unit has
It is sufficient to form only the corrugated irregularities for shaping the bellows tube peripheral wall into a corrugated shape, and the manufacturing cost of the molding unit can be reduced. Furthermore, since it is only necessary to form the recesses individually in the inner tube, the formation of the recesses in the inner tube can be compared with, for example, forming wave-shaped irregularities and concave grooves for protrusions on the inner circumferential surface of a molding unit. It can be done easily and inexpensively. Furthermore, since the protrusions are formed by extrusion from the recesses formed in the inner tube, the wall thickness of the bellows tube circumferential wall can be increased at the protrusion forming part, which makes it possible to increase the thickness of the bellows tube circumferential wall in spite of its strength. Although it can be made small and a protrusion is formed on the inner peripheral surface, the inside of the bellows tube can be made as wide as possible for convenient insertion of electric wires, etc.
従つて、強度、特に曲げ強度の面で勝れ、しか
も、電線管等として便利に使用できる蛇腹管を安
価に作製できる蛇腹管成形方法を提供できるよう
になつた。
Therefore, it has become possible to provide a method for forming a bellows tube that is superior in terms of strength, especially bending strength, and can inexpensively produce a bellows tube that can be conveniently used as a conduit or the like.
第１図に示すように、内外二重管１，２間の環
状口３から軟化状態のチユーブ４をその軸芯方向
に沿つて押出し成形するとともに内管１から押出
チユーブ４内に空気を吹込んでこのチユーブ４を
径方向に膨張させる押出機５と、この押出機５か
らのチユーブ押出箇所において押出チユーブ４と
同芯に位置する状態でチユーブ押出方向に沿つて
移動しつつ押出チユーブ４の膨張に伴なつてチユ
ーブ４の周壁を軸芯方向に沿つた波形に成形する
筒状の成形型６を構成するように回動移動する二
つの成形帯７，７とを設けるとともに、前記内管
１の外周面に複数の凹溝８を周方向に適宜間隔を
隔てて形成して蛇腹管成形装置を構成する。
As shown in FIG. 1, a softened tube 4 is extruded from the annular opening 3 between the inner and outer double tubes 1 and 2 along its axial direction, and air is blown into the extruded tube 4 from the inner tube 1. Then, an extruder 5 expands this tube 4 in the radial direction, and the extrusion tube 4 is expanded while moving along the tube extrusion direction while being located concentrically with the extrusion tube 4 at the tube extrusion point from the extruder 5. Two molding bands 7, 7 are provided which rotate and move so as to form a cylindrical mold 6 for molding the peripheral wall of the tube 4 into a corrugated shape along the axial direction. A plurality of concave grooves 8 are formed at appropriate intervals in the circumferential direction on the outer peripheral surface of the bellows tube forming apparatus.
前記成形帯７，７は、内周面をその軸芯方向に
沿つた波形凹凸面に形成した半割筒状の成形ユニ
ツト７Ａ，７Ａの複数を軸芯方向で無端状に且つ
屈折自在に連結して構成されている。 The molding bands 7, 7 connect a plurality of half-cylindrical molding units 7A, 7A, each of which has an inner circumferential surface formed with a corrugated surface along its axial direction, in an endless manner and bendable in the axial direction. It is configured as follows.
そして、押出機５における環状口３及び凹溝８
から、内周面に軸芯方向に沿つた突条９を周方向
に適宜間隔を隔てて形成した軟化状態のチユーブ
４を押出し成形するとともに径方向に膨張させ乍
ら、前記両成形帯７，７を回動移動させることに
より、押出チユーブ４の周壁を成形型６の内周面
に沿う形状に成形して、第１図、第３図に示すよ
うに、周壁を、軸芯周りに巻回する山部１０と谷
部１１とから成る軸芯方向に沿つた波形に形成し
且つ内周面に軸芯方向に沿つた周方向複数の突条
１２を形成した硬質蛇腹管１３を連続的に成形す
る。 Then, the annular opening 3 and the groove 8 in the extruder 5
Then, a softened tube 4 having protrusions 9 along the axial direction formed on its inner circumferential surface at appropriate intervals in the circumferential direction is extruded and expanded in the radial direction, while both the molded bands 7, 7, the peripheral wall of the extrusion tube 4 is molded into a shape that follows the inner peripheral surface of the mold 6, and the peripheral wall is wound around the axis as shown in FIGS. 1 and 3. A hard bellows tube 13 is continuously formed into a corrugated shape along the axial direction, consisting of rotating peaks 10 and troughs 11, and has a plurality of circumferential protrusions 12 formed on the inner peripheral surface along the axial direction. Form into.
環状の山部１０〔又は谷部１１〕を軸芯方向に
適宜間隔を隔てて並置して周壁を軸芯方向に沿つ
た波形に形成した蛇腹管の成形に適用する。
The present invention is applied to the molding of a bellows tube in which annular peaks 10 (or troughs 11) are juxtaposed at appropriate intervals in the axial direction, and the peripheral wall is formed into a corrugated shape along the axial direction.
第１図乃至第３図は実施例を示し、第１図は成
形装置の一部切欠き側面図、第２図は成形装置要
部の縦断正面図、第３図は蛇腹管の縦断正面図で
ある。第４図は従来例を示す成形装置要部の縦断
面図である。
５……押出機、１，２……管、３……環状口、
４……チユーブ、７Ａ……成形ユニツト、６……
成形型、７……成形帯、１３……蛇腹管、８……
凹部、９……突条。
Figures 1 to 3 show an embodiment, with Figure 1 being a partially cutaway side view of the molding device, Figure 2 being a vertical sectional front view of the main parts of the molding device, and Figure 3 being a vertical sectional front view of the bellows tube. It is. FIG. 4 is a longitudinal cross-sectional view of the main part of a molding apparatus showing a conventional example. 5... Extruder, 1, 2... Tube, 3... Annular opening,
4...Tube, 7A...Molding unit, 6...
Molding die, 7... Molding band, 13... Bellows tube, 8...
Recessed portion, 9...projection.
Claims (1)
から軟化状態のチユーブ４をその軸芯方向に沿つ
て押出し成形するとともに前記内管１から押出し
チユーブ４内に空気を吹込んでこの押出チユーブ
４を径方向に膨張させ乍ら、内周面をその軸芯方
向に沿つた波形凹凸面とした成形ユニツト７Ａの
複数を無端状に連結して構成されていて、前記押
出機５からのチユーブ押出箇所において押出チユ
ーブ４と同芯に位置する状態でチユーブ押出方向
に沿つて移動しつつ押出チユーブ４の膨張に伴な
つてチユーブ４の周壁を軸芯方向に沿つた波形に
形成する筒状の成形型６を構成するように回動移
動自在な二つの成形帯７，７を回動移動させるこ
とにより、周壁が軸芯方向に沿つた波形の蛇腹管
１３を成形する方法において、前記内管１の外周
面に凹部８を形成して、押出チユーブ４の内周面
に軸芯方向に沿つた突条９を一連一体の状態に形
成する蛇腹管成形方法。1 Annular opening 3 between the inner and outer double pipes 1 and 2 of the extruder 5
The tube 4 in a softened state is extruded along its axial direction, and air is blown into the extruded tube 4 from the inner tube 1 to expand the extruded tube 4 in the radial direction. It is constructed by connecting a plurality of molding units 7A having corrugated surfaces along the axial direction in an endless manner, and the tube is located concentrically with the extrusion tube 4 at the tube extrusion point from the extruder 5. Two rotatably movable molds 6 move along the extrusion direction and form a cylindrical mold 6 that forms the peripheral wall of the extrusion tube 4 into a corrugated shape along the axial direction as the extrusion tube 4 expands. In a method of forming a corrugated bellows tube 13 with a peripheral wall along the axial direction by rotationally moving the forming bands 7, 7, a recess 8 is formed on the outer circumferential surface of the inner tube 1, and the extruded tube 4 is formed. A method for forming a bellows tube in which a series of protrusions 9 are integrally formed along the axial direction on the inner circumferential surface of the bellows tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60013177A JPS61172720A (en) | 1985-01-25 | 1985-01-25 | Molding of bellows pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60013177A JPS61172720A (en) | 1985-01-25 | 1985-01-25 | Molding of bellows pipe |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61172720A JPS61172720A (en) | 1986-08-04 |
| JPH0412207B2 true JPH0412207B2 (en) | 1992-03-03 |
Family
ID=11825899
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60013177A Granted JPS61172720A (en) | 1985-01-25 | 1985-01-25 | Molding of bellows pipe |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61172720A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0312687U (en) * | 1989-06-21 | 1991-02-08 | ||
| US9958091B1 (en) | 2013-03-15 | 2018-05-01 | Advanced Drainage Systems, Inc. | Pipe with embedded wire |
| US9341289B1 (en) | 2013-03-15 | 2016-05-17 | Plastic Tubing Industries, Inc. | Corrugated drainage pipe with protuberances |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5138039U (en) * | 1974-09-12 | 1976-03-22 | ||
| JPS58151744U (en) * | 1982-04-05 | 1983-10-11 | リズム自動車部品製造株式会社 | boot seal |
-
1985
- 1985-01-25 JP JP60013177A patent/JPS61172720A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5138039U (en) * | 1974-09-12 | 1976-03-22 | ||
| JPS58151744U (en) * | 1982-04-05 | 1983-10-11 | リズム自動車部品製造株式会社 | boot seal |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61172720A (en) | 1986-08-04 |
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