JPH0544907B2 - - Google Patents
Info
- Publication number
- JPH0544907B2 JPH0544907B2 JP62073359A JP7335987A JPH0544907B2 JP H0544907 B2 JPH0544907 B2 JP H0544907B2 JP 62073359 A JP62073359 A JP 62073359A JP 7335987 A JP7335987 A JP 7335987A JP H0544907 B2 JPH0544907 B2 JP H0544907B2
- Authority
- JP
- Japan
- Prior art keywords
- mold
- molded product
- bellows
- injection
- primary molded
- 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
- 238000000034 method Methods 0.000 claims description 7
- 238000002347 injection Methods 0.000 claims description 5
- 239000007924 injection Substances 0.000 claims description 5
- 238000000465 moulding Methods 0.000 description 7
- 238000001746 injection moulding Methods 0.000 description 4
- 239000011347 resin Substances 0.000 description 4
- 229920005989 resin Polymers 0.000 description 4
- 238000010102 injection blow moulding Methods 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- -1 polypropylene Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/0053—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor combined with a final operation, e.g. shaping
- B29C45/0055—Shaping
-
- 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)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Shaping Of Tube Ends By Bending Or Straightening (AREA)
Description
【発明の詳細な説明】
〔産業上の利用分野〕
この発明は射出成形した一次成形品から蛇腹状
の成形品を成形する方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method for molding a bellows-shaped molded product from an injection-molded primary molded product.
一般に蛇腹状の成形品の成形は、両端が開口し
たパリソンを成形した後、パリソンと共にコアを
ブロー型に移送してブロー成形して成形するイン
ジエクシヨンブロー成形法か、または蛇腹内径形
状に形成されたコア型と、成形外径形状に形成さ
れた割型によるキヤビ型を用いて射出成形した成
形品を、エアにより膨らませてコア型より取り出
す射出成形法により行われている。
Generally, bellows-shaped molded products are formed using the injection blow molding method, in which a parison with both ends open is molded, and then the core is transferred together with the parison to a blow mold and blow-molded, or it is formed into a bellows inner diameter shape. This is an injection molding method in which a molded product is injection molded using a molded core mold and a split mold molded into a molded outer diameter shape, and the molded product is inflated with air and taken out from the core mold.
上記インジエクシヨンブロー成形法によるもの
では、高価で複雑なインジエクシヨンブロー成形
機や、成形型とブロー型の２つの金型を必要とす
ることから設備費、保守管理費が嵩み易く、射出
成形法によるものではコアから成形品を取り出す
のが困難で、取り出しの際に破損し易い問題があ
つた。
The injection blow molding method described above requires an expensive and complicated injection blow molding machine and two molds, a mold and a blow mold, which tends to increase equipment costs and maintenance costs. In the injection molding method, it was difficult to take out the molded product from the core, and there was a problem that it was easily damaged when taken out.
この発明は上記従来の成形法における問題点を
解決するために考えられたものであつて、その目
的はブロー金型を必要とせず、また成形品の取出
しも容易で破損の少ない新たな成形方法を提供す
ることにある。 This invention was devised to solve the above-mentioned problems with the conventional molding method, and its purpose is to create a new molding method that does not require a blow mold, allows easy removal of the molded product, and causes less damage. Our goal is to provide the following.
上記目的によるこの発明は、所定間隔ごとに薄
肉部を有する筒状の一次成形品をコア型周囲に射
出成形し、その次成形品を型開後に軸方向に圧縮
して、上記薄肉部にて屈曲変形した蛇腹状の成形
品となすことによつて上記問題点を解決してな
る。
This invention for the above-mentioned purpose involves injection molding a cylindrical primary molded product having thin-walled parts at predetermined intervals around a core mold, compressing the next molded product in the axial direction after opening the mold, and forming the thin-walled parts at predetermined intervals. The above-mentioned problems are solved by forming a bellows-shaped molded product that is bent and deformed.
以下この発明を図示の実施例ついて詳細に説明
する。 The present invention will be described in detail below with reference to the illustrated embodiments.
図中１は可動型、２は固定型で、両金型の間に
一対の割型による摺動型３が位置している。
In the figure, 1 is a movable mold, 2 is a fixed mold, and a sliding mold 3 consisting of a pair of split molds is located between both molds.
この摺動型３は両端面を可動型１と固定型２の
型面に接して設けられ、また一対の割型により形
成されたキヤビテイ４の中央には、可動型１に突
設したコア型５が位置している。 The sliding mold 3 has both end surfaces in contact with the mold surfaces of the movable mold 1 and the fixed mold 2, and a core mold protruding from the movable mold 1 is provided in the center of a cavity 4 formed by a pair of split molds. 5 is located.
上記キヤビテイ４の周壁には、一次成形品６を
部分的に薄肉に成形する鋭角な環状突起７，７が
一定間隔ごとに突出形成してある。 On the peripheral wall of the cavity 4, sharp annular protrusions 7, 7 are formed at regular intervals to form the primary molded product 6 into a partially thin wall.
またキヤビテイ４の両端部は、可動型１及び固
定型２との型面とによつて形成されたフランジ成
形部となつており、そのフランジ成形部の可動型
側内には、上記コア型５に挿通した軸方向に移動
自在なストリツパープレート８が設けてある。 Further, both ends of the cavity 4 are flange molded parts formed by the mold surfaces of the movable mold 1 and the fixed mold 2, and the core mold 5 is located inside the movable mold side of the flange molded part. An axially movable stripper plate 8 is provided which is inserted through the axially movable stripper plate 8.
このストリツパープレート８は可動型１の孔９
を貫通して可動盤１０の内部から押出される突出
ピン１１によつて、型開後に上記一次成形品６を
圧縮する。 This stripper plate 8 is connected to the hole 9 of the movable mold 1.
After the mold is opened, the primary molded product 6 is compressed by a protruding pin 11 that is pushed out from inside the movable platen 10 through the mold.
１２は固定型２に設けた樹脂路で、キヤビテイ
４の端部と接続し、また固定盤１３を通してゲー
トに射出ノズル１４がノズルタツチされる。 Reference numeral 12 denotes a resin passage provided in the fixed mold 2 and connected to the end of the cavity 4, and an injection nozzle 14 is nozzle-touched to the gate through the fixed plate 13.
次に成形方法について説明する。 Next, the molding method will be explained.
第１図に示す型閉状態において、射出ノズル１
４から樹脂路１２に溶融樹脂（たとえばポリプロ
ピレン）を射出すると、溶融樹脂はキヤビテイ４
に流動して充填され、上記コア型５の周囲に上記
一次成形品６が成形される。 In the mold closed state shown in Fig. 1, the injection nozzle 1
When molten resin (for example, polypropylene) is injected from cavity 4 into resin channel 12, the molten resin flows into cavity 4.
The primary molded product 6 is molded around the core mold 5.
この一次成形品６は筒状で、壁部は外周面に形
成された一定間隔ごとの環状溝６ａ，６ａ（第２
図参照）によつて部分的に薄肉に形成され、かつ
両端はフランジ６ｂ，６ｂに形成されている。 This primary molded product 6 has a cylindrical shape, and the wall portion has annular grooves 6a, 6a (second
(see figure) to be partially thin, and both ends are formed into flanges 6b, 6b.
上記一次成形品６の射出成形が完了したなら
ば、上記摺動型３を第２図に示すように型開き
し、一次成形品６をコア型５に付着させたまま可
動型１と固定型２との間に残置する。 When the injection molding of the primary molded product 6 is completed, the sliding mold 3 is opened as shown in FIG. remain between 2 and 2.
そして次に第３図に示すように、突出ピン１１
を押出してストリツパープレート８を固定型２の
方向に移動させる。これにより一次成形品６は圧
縮され、薄肉部分が屈曲して一部分が外方へ突出
し、蛇腹状に変形する。 Then, as shown in FIG.
is pushed out to move the stripper plate 8 toward the fixed mold 2. As a result, the primary molded product 6 is compressed, its thin wall portion is bent, and a portion thereof protrudes outward, deforming into a bellows shape.
上記成形が完了し、一次成形品６の変形による
蛇腹状成形品１５が完全に固化するまで所要時間
その状態を保持したのち、第４図に示すごとく固
定型２と摺動型３との型開きを行い、更に突出ピ
ン１１を押出して蛇腹状成形品１５をコア型５か
ら抜出す。 After the above molding is completed and the state is maintained for a required time until the bellows-shaped molded product 15 due to the deformation of the primary molded product 6 is completely solidified, the fixed mold 2 and the sliding mold 3 are assembled as shown in FIG. After opening, the projecting pin 11 is further pushed out and the bellows-shaped molded product 15 is extracted from the core mold 5.
この説明中、摺動型３は可動型側に設けられて
いるが、固定型側に設けてもよく、この場合に
は、可動型１と摺動型３とが型開される。また蛇
腹の数、大きさ、ピツチ等は薄肉部の数、大き
さ、位置等によつて定まり、それらは任意に設定
することができる。 In this explanation, the sliding mold 3 is provided on the movable mold side, but it may be provided on the fixed mold side, and in this case, the movable mold 1 and the sliding mold 3 are opened. Further, the number, size, pitch, etc. of the bellows are determined by the number, size, position, etc. of the thin-walled portions, and these can be set arbitrarily.
この発明は上述のように、射出成形した筒状の
一次成形品を、型開後に軸方向に押圧して圧縮
し、蛇腹状の成形品に屈曲変形してなることか
ら、一次成形品を蛇腹状に形成するブロー型を不
要とし、また蛇腹状に屈曲変形したのちに、更に
その成形品を押圧するだけでコア型から離型する
ことができるため、離型に手数が掛らず破損など
も生じ難い。更にまたキヤビテイ型面の凹凸も蛇
腹を形成する場合の型面に比べてきわめて小さく
て済むので、金型の加工が容易となり、成形に要
する設備費、保守管理費等も低減するため低コス
トにて蛇腹状成形品を成形することができるなど
の特長を有する。
As described above, this invention involves compressing an injection-molded cylindrical primary molded product in the axial direction after opening the mold, and bending and deforming it into a bellows-shaped molded product. There is no need for a blow mold to form the shape, and after the molded product has been bent and deformed into a bellows shape, it can be released from the core mold by simply pressing the molded product further, so there is no need to worry about mold release and damage. is also unlikely to occur. Furthermore, the unevenness on the cavity mold surface is extremely small compared to the mold surface when forming bellows, making it easier to process the mold, and reducing the equipment costs and maintenance management costs required for molding, resulting in lower costs. It has the advantage of being able to form bellows-shaped molded products.
図面はこの発明に係る蛇腹状成形品の成形方法
の１例を示すもので、第１図は一次成形品を射出
成形した際の金型装置の断面図、第２図は摺動型
を開いた際の金型装置の断面図、第３図は一次成
形品圧縮時の金型装置の断面図、第４図は成形品
離型時の金型装置の断面図である。
１……可動型、２……固定型、３……摺動型、
４……キヤビテイ、５……コア型、６……一次成
形品、７……環状突起、８……ストリツパープレ
ート、１５……蛇腹状成形品。
The drawings show one example of the method for molding a bellows-shaped molded product according to the present invention, and FIG. 1 is a cross-sectional view of a mold device when a primary molded product is injection molded, and FIG. 2 is a cross-sectional view of the mold device when the sliding mold is opened. FIG. 3 is a cross-sectional view of the mold device when compressing the primary molded product, and FIG. 4 is a cross-sectional view of the mold device when releasing the molded product. 1...movable type, 2...fixed type, 3...sliding type,
4... Cavity, 5... Core mold, 6... Primary molded product, 7... Annular projection, 8... Stripper plate, 15... Bellows-shaped molded product.
Claims (1)
形品をコア型周囲に射出成形し、その一次成形品
を型開後に軸方向に圧縮して、上記薄肉部にて屈
曲変形した蛇腹状の成形品となすことを特徴とす
る蛇腹状成形品の成形方法。1. A cylindrical primary molded product having thin-walled parts at predetermined intervals is injection molded around a core mold, and after the mold is opened, the primary molded product is compressed in the axial direction to produce a bellows-shaped product that is bent and deformed at the thin-walled parts. A method for forming a bellows-shaped molded product.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62073359A JPS63237933A (en) | 1987-03-27 | 1987-03-27 | Molding method for bellowslike molded product |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62073359A JPS63237933A (en) | 1987-03-27 | 1987-03-27 | Molding method for bellowslike molded product |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63237933A JPS63237933A (en) | 1988-10-04 |
| JPH0544907B2 true JPH0544907B2 (en) | 1993-07-07 |
Family
ID=13515896
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62073359A Granted JPS63237933A (en) | 1987-03-27 | 1987-03-27 | Molding method for bellowslike molded product |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63237933A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19935139C2 (en) * | 1999-07-27 | 2002-02-28 | Hekuma Herbst Maschb Gmbh | Method and device for producing a plastic body |
| FR2811932B1 (en) * | 2000-07-20 | 2003-05-16 | Oreal | METHOD FOR MANUFACTURING A BELLOWS |
| DE102007002600A1 (en) * | 2007-01-12 | 2008-07-17 | Mann + Hummel Gmbh | Injection molded part with a fold contour and method for producing the injection molded part |
| KR102476739B1 (en) * | 2020-08-21 | 2022-12-12 | 주식회사 디엠씨 | Mold injection method to easily take out and manufacture bellows-shaped injection products |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2347101A (en) * | 1941-05-20 | 1944-04-18 | Us Rubber Co | Method of making corrugated tubes |
| US3201111A (en) * | 1963-11-12 | 1965-08-17 | Afton Leonard | Multi-purpose, inherently biased, selfinflatable bellows |
| US3339004A (en) * | 1966-03-16 | 1967-08-29 | Sweetheart Plastics | Forming of flexible drinking straws |
-
1987
- 1987-03-27 JP JP62073359A patent/JPS63237933A/en active Granted
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2347101A (en) * | 1941-05-20 | 1944-04-18 | Us Rubber Co | Method of making corrugated tubes |
| US3201111A (en) * | 1963-11-12 | 1965-08-17 | Afton Leonard | Multi-purpose, inherently biased, selfinflatable bellows |
| US3339004A (en) * | 1966-03-16 | 1967-08-29 | Sweetheart Plastics | Forming of flexible drinking straws |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63237933A (en) | 1988-10-04 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |