JP2619777B2 - Stretchable blow molded member and method of manufacturing the same - Google Patents
Stretchable blow molded member and method of manufacturing the sameInfo
- Publication number
- JP2619777B2 JP2619777B2 JP5022051A JP2205193A JP2619777B2 JP 2619777 B2 JP2619777 B2 JP 2619777B2 JP 5022051 A JP5022051 A JP 5022051A JP 2205193 A JP2205193 A JP 2205193A JP 2619777 B2 JP2619777 B2 JP 2619777B2
- Authority
- JP
- Japan
- Prior art keywords
- blow
- molded member
- bellows
- wall
- parison
- 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
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L27/00—Adjustable joints, Joints allowing movement
- F16L27/12—Adjustable joints, Joints allowing movement allowing substantial longitudinal adjustment or movement
-
- 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
- B29C49/42—Component parts, details or accessories; Auxiliary operations
- B29C49/48—Moulds
-
- 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
- B29L2031/00—Other particular articles
- B29L2031/703—Bellows
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Joints Allowing Movement (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、機械又は昇降装置のカ
バー等に用いられるベローズ等の伸縮するブロー成形部
材、及びその製造方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blow molding member such as a bellows used for a cover of a machine or a lifting device, and a method of manufacturing the same.
【０００２】[0002]
【従来の技術】従来より知られているベローズは、図４
〜図６に示すように、谷３の部分で一体的に連結された
複数のリング状の山２で構成される部材であり、谷３を
挟む部分の形状は略Ｖ字形をなしている。このようなベ
ローズ１は例えばブロー成形により成形され、そのブロ
ー成形用金型として、内面にリング状のクサビ形突起７
ａ（図６参照）を等間隔に多数備え、その間にベローズ
の山２に相当する凹所８を形成した一対の金型７を使用
する。2. Description of the Related Art Conventionally known bellows are shown in FIG.
As shown in FIG. 6 to FIG. 6, the valley 3 is a member composed of a plurality of ring-shaped ridges 2 integrally connected at the valley 3, and the portion sandwiching the valley 3 has a substantially V shape. Such a bellows 1 is formed by, for example, blow molding, and a ring-shaped wedge-shaped projection 7 is formed on the inner surface as a blow molding die.
a (see FIG. 6) are provided at equal intervals, and a pair of molds 7 having a recess 8 corresponding to the peak 2 of the bellows formed therebetween is used.
【０００３】ブロー成形は、まず円筒形のパリソンを押
し出し成形し、これを上記ベローズ成形用金型内に配置
し、続いてパリソン内にエアを吹き込み、パリソンを該
金型内壁面に沿ったベローズ形状に成形するものであ
る。ここで、図４〜６に示すベローズ１は角形ベローズ
であるため、エアの吹き込みにより膨張する円筒状パリ
ソンは、始めに長辺部４のクサビ状突起７ａの先端に接
触（図５の仮想線Ｐ1参照）し、次第に接触領域を広げ
ながら膨張し、次に短辺部５のクサビ状突起７ａの先端
に接触（図５の仮想線Ｐ2参照）し、続いてコーナー部
６のクサビ状突起７ａの先端に接触する。最後に、パリ
ソンはクサビ状突起７ａ間の凹所８内に張り出してい
き、金型７の内壁面全体に完全に接触しベローズが完成
する。[0003] In blow molding, first, a cylindrical parison is extruded and placed in the above-mentioned bellows molding die, and then air is blown into the parison so that the parison is moved along the inner wall surface of the die. It is molded into a shape. Here, since the bellows 1 shown in FIGS. 4 to 6 are square bellows, the cylindrical parison that expands by blowing air first contacts the tip of the wedge-shaped projection 7a on the long side 4 (the virtual line in FIG. 5). P 1 reference), and expands with an increasing progressively contact area, and then contacting the tip of the wedge-shaped protrusion 7a of the short side portion 5 (see phantom line P 2 in FIG. 5), followed by wedge-shaped corners 6 It contacts the tip of the projection 7a. Finally, the parison protrudes into the recess 8 between the wedge-shaped protrusions 7a and completely contacts the entire inner wall surface of the mold 7, thereby completing the bellows.
【０００４】[0004]
【発明が解決しようとする課題】ところで、ブロー成形
においては、パリソンが金型壁面のいずれかの箇所に接
触すると同時に、接触した箇所のパリソンの延伸が事実
上ストップ（以後の肉厚変化がない）し、以後の延伸は
パリソンの残りの部分で賄われる。従って、図４〜図６
に示すベローズの場合、ベローズの谷に相当する部分で
はパリソンがクサビ状突起の先端に接触したときの肉厚
が最後まで維持され、山に相当する部分はさらに延伸す
るので肉厚が相対的に薄くなる（その傾向は通常山の頂
部に近づくほど顕著となる）。By the way, in the blow molding, at the same time when the parison comes into contact with any part of the mold wall surface, the stretching of the parison at the contacted part is practically stopped (there is no change in wall thickness thereafter). ) And subsequent stretching will be covered by the rest of the parison. Therefore, FIGS.
In the case of the bellows shown in (1), the wall thickness when the parison contacts the tip of the wedge-shaped projection is maintained to the end in the portion corresponding to the valley of the bellows, and the portion corresponding to the peak further extends, so the wall thickness is relatively large. Thinner (usually more pronounced closer to the top of the mountain).
【０００５】このようにブロー成形によるベローズは谷
の部分の肉厚が相対的に厚いため、大きい伸縮や曲げが
十分にできないという問題点があった。つまり、ベロー
ズの伸縮は主として、谷の部分が外力を受けて変形しＶ
字形部分が開閉（Ｖ字形の角度が拡大又は縮小）するこ
とにより行われるのであるが、谷の部分の肉厚が厚くな
っているとそこが外力により変形しにくいためである。[0005] As described above, the bellows formed by blow molding have a problem in that large expansion and contraction and bending cannot be sufficiently performed because the thickness of the valley portion is relatively large. In other words, the expansion and contraction of the bellows mainly causes
The opening and closing of the V-shaped portion (enlargement or reduction of the angle of the V-shaped portion) is performed. This is because if the thickness of the valley portion is large, the valley portion is not easily deformed by an external force.
【０００６】本発明は、上記従来技術の問題点を解決す
るためになされたもので、大きい伸縮や曲げが可能なベ
ローズ等のブロー成形部材を得ることを目的とする。The present invention has been made to solve the above-mentioned problems of the prior art, and has as its object to obtain a blow-molded member such as a bellows which can be greatly expanded and contracted and bent.
【０００７】[0007]
【課題を解決するための手段】上記目的のため、本発明
に関わるブロー成形部材は、断面略Ｖ字形の谷になった
部分を備え、Ｖ字形を構成する両壁のなす角度が変化す
ることにより伸縮するブロー成形部材において、Ｖ字形
部分の外壁がエッジ状の鋭角をなすとともに、Ｖ字形の
谷の先端部肉厚がその近傍の肉厚より薄く形成されてい
ることを特徴とする。また、本発明は上記ブロー成形部
材の製造方法に関し、先端をエッジ状の鋭角に形成した
断面クサビ状の突起を内壁に備えたブロー成形用金型内
に筒状パリソンを配置し、パリソン内部にエアを吹き込
みパリソンを金型内壁形状に沿った形状に成形し、か
つ、その間金型内壁が元の位置から軸方向に相対移動し
ないことを特徴とする。なお、金型内壁が元の位置から
軸方向に相対移動しないとは、本発明に関わる金型が突
起の先端形状以外は従来の分割金型と同じ、つまり、縦
に分割された複数の分割金型からなり、パリソンを挟ん
だ時点でキャビティ形状が完全に画定される通常の形態
のものであり、例えば特開平１−２６３０２３号公報に
記載されたような成形中に軸方向に移動自在なセグメン
トで構成された特殊な分割金型ではないという意味であ
る。 In order to achieve the above object, a blow-molded member according to the present invention has a valley portion having a substantially V-shaped cross section, and an angle formed between both walls constituting the V-shape. In the blow molded member that expands and contracts due to the change in the shape, the outer wall of the V-shaped portion forms an acute edge-like angle and the V-shaped
The thickness of the tip of the valley is formed to be thinner than the thickness in the vicinity thereof. Further, the present invention relates to a method for manufacturing the blow-molded member, wherein a cylindrical parison is disposed in a blow-molding mold having a wedge-shaped cross-section having an edge formed at an acute angle on an inner wall, and the parison is provided inside the parison. Blow air to form the parison into a shape that matches the shape of the mold inner wall .
Meanwhile, the mold inner wall moves relative to the axial direction from the original position.
It is characterized by not having. In addition, the mold inner wall is
The term “no relative movement in the axial direction” means that the mold according to the present invention
Except for the starting tip shape, it is the same as the conventional split mold,
Consisting of multiple split molds, separated by a parison
Normal form, at which point the cavity shape is completely defined
For example, in Japanese Patent Application Laid-Open No. 1-263023
Segments that can move axially during molding as described
Means that it is not a special split mold composed of
You.
【０００８】より具体的には、本発明における上記ブロ
ー成形部材はベローズであり、Ｖ字形の先端部がベロー
ズの谷に相当することを特徴とし、その場合、ブロー成
形金型内壁に形成された断面クサビ状の突起はリング状
をなすことを特徴とする。More specifically, the blow-molded member according to the present invention is a bellows, and the V-shaped tip corresponds to a valley of the bellows. In this case, the blow-molded member is formed on the inner wall of the blow mold. The protrusion having a wedge-shaped cross section is formed in a ring shape.
【０００９】[0009]
【作用】このように、本発明のブロー成形部材において
は、Ｖ字形の部分の外壁がエッジ状の鋭角をなすととも
に、Ｖ字形の先端部肉厚がその近傍の肉厚より薄く形成
されているため、Ｖ字形先端の変形が容易となり、Ｖ字
形部分が外力に従い大きく開閉し、大きい伸縮や曲げが
可能となる。As described above, in the blow-molded member according to the present invention, the outer wall of the V-shaped portion has an edge-like acute angle, and the V-shaped tip portion has a smaller thickness than the thickness in the vicinity thereof. Therefore, the V-shaped tip can be easily deformed, and the V-shaped portion can be opened and closed greatly according to the external force, and large expansion and contraction and bending can be performed.
【００１０】また、本発明のブロー成形部材の製造方法
において、先端をエッジ状の鋭角に形成した断面クサビ
状の突起を内壁に備えたブロー成形用金型を使用したの
で、従来肉厚が厚いまま維持されていたＶ字形の先端部
分の肉厚をその近傍の肉厚より薄くすることが可能とな
る。これは、パリソンが金型の凹所８内に張り出すと
き、谷１３の先端部分ではパリソンが鋭いエッジに押し
付けられ、その部分に塑性流動（延伸）が生ずるためか
と考えられる。In the method of manufacturing a blow-molded member according to the present invention, since a blow-molding mold having a wedge-shaped cross-section having an edge formed at an acute angle on the inner wall is used, a conventional thick wall is used. The thickness of the V-shaped tip portion, which is maintained as it is, can be made smaller than the thickness in the vicinity thereof. This is probably because when the parison projects into the recess 8 of the mold, the parison is pressed against the sharp edge at the tip of the valley 13 and plastic flow (stretching) occurs in that portion.
【００１１】[0011]
【実施例】以下、本発明の実施例を図１〜図３を参照し
て説明する。DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.
【００１２】本実施例の角形ベローズ１１は、介護用上
下可動ベッドの駆動部分のカバーとして使用されるもの
で、内周部分の大きさ（ａ×ｂ）が３９４ｍｍ×６１４
ｍｍ、長さｃが７００ｍｍ、谷のピッチが５０ｍｍのポ
リプロピレン系エラストマー製ベローズであり、山１２
の肉厚が全周でほぼ均等になるように、その高さｈを長
辺部１４の中心（Ｂ−Ｂ断面）で４１ｍｍ、短辺部１５
の中心（Ｃ−Ｃ断面）で３４．３ｍｍ、コーナー部１６
の中心（Ｄ−Ｄ断面）で２６．２ｍｍとし、その間なだ
らかに変化させた。The rectangular bellows 11 of this embodiment is used as a cover for a drive portion of a vertically movable bed for nursing care, and has a size (a × b) of an inner peripheral portion of 394 mm × 614.
mm, a length c of 700 mm, and a pitch of valleys of 50 mm.
The height h is 41 mm at the center (BB section) of the long side portion 14 and the short side portion 15 is set so that the thickness of the
34.3mm at the center (C-C cross section) of the
Was 26.2 mm at the center (cross section taken along line D-D) of FIG.
【００１３】本実施例の角形ベローズ１１は、円筒形パ
リソンを押し出しダイスから対向配置された一対の金型
間に押し出し、金型を閉鎖してパリソンの両端を挟み、
次いでパリソン内部にエアを吹き込むという周知のブロ
ー成形方法により製造するものであり、金型１７（図３
（ａ）参照）の内壁面にリング状に形成されたクサビ状
突起１７ａ間の凹部１８の深さは、目的とする角形ベロ
ーズ１１の山の高さｈの変化に応じたものとされる。The square bellows 11 of the present embodiment pushes out a cylindrical parison from an extrusion die between a pair of oppositely arranged dies, closes the dies, sandwiches both ends of the parison,
Then, the mold is manufactured by a well-known blow molding method in which air is blown into the inside of the parison.
The depth of the concave portion 18 between the wedge-shaped protrusions 17a formed on the inner wall surface of the inner wall surface (see (a)) is determined according to the change in the height h of the peak of the target square bellows 11.
【００１６】本実施例では、図３（ａ）の拡大図に明瞭
に示されるように、クサビ状突起１７ａの先端部が鋭い
エッジ状に形成されているため、ベローズの谷１３を挟
んだＶ字形部分の外壁がエッジ状の鋭角をなすととも
に、谷１３の先端部の肉厚ｔ1がその近傍の肉厚ｔ0より
薄くなる。In this embodiment, as clearly shown in the enlarged view of FIG. 3A, the tip of the wedge-shaped projection 17a is formed into a sharp edge, so that the V The outer wall of the letter-shaped portion forms an edge-like acute angle, and the thickness t 1 of the tip of the valley 13 is smaller than the thickness t 0 in the vicinity thereof.
【００１７】この角形ベローズ１１を、介護用上下可動
ベッドの駆動部分のカバーとして使用したところ、２０
０ｍｍ〜７００ｍｍの極めて大きい伸縮が可能であっ
た。When this rectangular bellows 11 was used as a cover for a drive portion of a vertically movable bed for nursing care,
Extremely large expansion and contraction of 0 mm to 700 mm was possible.
【００１８】[0018]
【発明の効果】本発明によれば、谷の先端部の肉厚を薄
くし、大きい伸縮や曲げが可能なベローズ等のブロー成
形部材を得ることができる。According to the present invention, it is possible to obtain a blow-molded member such as a bellows, which can be greatly expanded and contracted or bent by reducing the thickness of the tip of the valley.
【図面の簡単な説明】[Brief description of the drawings]
【図１】本発明に関わる角形ベローズの正面図である。FIG. 1 is a front view of a square bellows according to the present invention.
【図２】同側面図である。FIG. 2 is a side view of the same.
【図３】図２のＢ−Ｂ断面図（ａ）、Ｃ−Ｃ断面図
（ｂ）及びＤ−Ｄ断面図（ｃ）である。なお、（ａ）に
は金型の断面を一部併記し、ベローズの谷の部分の拡大
図を示した。3 is a sectional view taken along line BB (a), a sectional view taken along line CC (b), and a sectional view taken along line DD (c) of FIG. 2; (A) also shows a part of the cross section of the mold and an enlarged view of a valley portion of the bellows.
【図４】従来の角形ベローズの正面図である。FIG. 4 is a front view of a conventional rectangular bellows.
【図５】同側面図である。FIG. 5 is a side view of the same.
【図６】図５のＡ−Ａ断面図（金型の断面も一部併記）
である。FIG. 6 is a sectional view taken along line AA of FIG.
It is.
１１ 角形ベローズ １２ ベローズの山 １３ ベローズの谷 １４ 長辺部 １５ 短辺部 １６ コーナー部 １７ ブロー成形用金型 １８ 金型の凹所 11 Square Bellows 12 Bellows Crest 13 Bellows Valley 14 Long Side 15 Short Side 16 Corner 17 Blow Mold 18 Concavity of Mold
Claims (4)
Ｖ字形を構成する両壁のなす角度が変化することにより
伸縮するブロー成形部材において、Ｖ字形部分の外壁が
エッジ状の鋭角をなすとともに、Ｖ字形の谷の先端部肉
厚がその近傍の肉厚より薄く形成されていることを特徴
とするブロー成形部材。A valley having a substantially V-shaped cross section;
In a blow-molded member which expands and contracts by changing the angle between both walls constituting the V-shape, the outer wall of the V-shape portion forms an edge-like acute angle, and the wall thickness at the tip of the V-shape valley is in the vicinity. A blow molded member formed to be thinner than a thickness.
形の先端部がベローズの谷に相当することを特徴とする
請求項１に記載されたブロー成形部材。2. The blow-molded member according to claim 1, wherein the blow-molded member is a bellows, and a V-shaped tip corresponds to a valley of the bellows.
製造方法であって、先端をエッジ状の鋭角に形成した断
面クサビ状の突起を内壁に備えたブロー成形用金型内に
筒状パリソンを配置し、パリソン内部にエアを吹き込み
パリソンを金型内壁形状に沿った形状に成形し、かつ、
その間金型内壁が元の位置から軸方向に相対移動しない
ことを特徴とするブロー成形部材の製造方法。3. The blow-molded member according to claim 1,
A manufacturing method, wherein a cylindrical parison is arranged in a blow molding die having a wedge-shaped cross-section having an edge formed at an acute angle on an inner wall, and air is blown into the parison to form a parison on the inner wall of the mold. Molded into a shape along with the shape , and
A method for manufacturing a blow-molded member, wherein the inner wall of the mold does not relatively move in the axial direction from the original position during that time .
クサビ状の突起はブロー成形用金型内壁にリング状に形
成されていることを特徴とする請求項３に記載されたブ
ロー成形部材の製造方法。4. The blow-molded member according to claim 3, wherein the blow-molded member is a bellows, and the wedge-shaped projection is formed in a ring shape on the inner wall of the blow-molding die. Method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5022051A JP2619777B2 (en) | 1993-01-16 | 1993-01-16 | Stretchable blow molded member and method of manufacturing the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5022051A JP2619777B2 (en) | 1993-01-16 | 1993-01-16 | Stretchable blow molded member and method of manufacturing the same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06210712A JPH06210712A (en) | 1994-08-02 |
| JP2619777B2 true JP2619777B2 (en) | 1997-06-11 |
Family
ID=12072127
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5022051A Expired - Fee Related JP2619777B2 (en) | 1993-01-16 | 1993-01-16 | Stretchable blow molded member and method of manufacturing the same |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2619777B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0379123A (en) * | 1989-08-22 | 1991-04-04 | Sumitomo Electric Ind Ltd | Constant current source circuit |
| JP2002349719A (en) * | 2001-05-29 | 2002-12-04 | Nippon Mektron Ltd | Boot and boot molding die |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01263023A (en) * | 1988-04-14 | 1989-10-19 | Moeller Werke Gmbh | Manufacture of hollow body composed of thermoplastic material and blow molding die |
-
1993
- 1993-01-16 JP JP5022051A patent/JP2619777B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH06210712A (en) | 1994-08-02 |
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