JPH0446737B2 - - Google Patents
Info
- Publication number
- JPH0446737B2 JPH0446737B2 JP61200007A JP20000786A JPH0446737B2 JP H0446737 B2 JPH0446737 B2 JP H0446737B2 JP 61200007 A JP61200007 A JP 61200007A JP 20000786 A JP20000786 A JP 20000786A JP H0446737 B2 JPH0446737 B2 JP H0446737B2
- Authority
- JP
- Japan
- Prior art keywords
- mold
- hinge
- molded product
- parison
- molds
- 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
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
- B29C49/0031—Making articles having hollow walls
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (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、各種プラスチツクケースの本体また
は蓋体のように、ヒンジの付いた中空成形品をプ
ラスチツクのブロー成形によつて製造する方法に
関するものである。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a method for producing a hollow molded product with a hinge, such as the main body or lid of various plastic cases, by blow molding plastic. .
従来の技術
プラスチツクをブロー成形してヒンジ付中空成
形品を製造する方法は特開昭58−128822号公報に
記載されているように、従来から広く知られてい
る。BACKGROUND ART A method for producing a hinged hollow molded product by blow molding plastic is widely known as described in Japanese Patent Application Laid-open No. 128822/1982.
この従来の製造方法によれば、分割形式の金型
の間にパリスンを配置し、型締めを開始してヒン
ジ部を圧縮成形し、型締めを完了してブロー成形
後、金型を開いて成形品を取出す工程で中空成形
品を製造している。 According to this conventional manufacturing method, a parison is placed between the split molds, the mold is started to be clamped and the hinge part is compression molded, and after the mold clamping is completed and blow molding is completed, the mold is opened. Hollow molded products are manufactured in the process of removing the molded product.
発明が解決しようとする問題点
ところで、上記従来の製造方法によりヒンジ部
を中空成形品の端部以外に形成すると、ヒンジ部
付近にアンダーカツト部分が生じ、そのアンダー
カツト部分が薄肉となつて強度が著しく低下する
うえ、成形品を金型から取出す際にヒンジ部のア
ンダーカツト部分が容易に外れず、その工程に支
障をきたすことがあるばかりでなく、また、その
際に成形品を損傷したり、金型を損傷する虞れも
あつた。Problems to be Solved by the Invention By the way, if the hinge part is formed at a location other than the end of the hollow molded product using the above-mentioned conventional manufacturing method, an undercut part will be created near the hinge part, and the undercut part will become thin and the strength will be reduced. In addition, the undercut part of the hinge part does not come off easily when taking the molded product out of the mold, which may not only hinder the process, but also damage the molded product at that time. There was also a risk of damage to the mold.
本発明は、このような従来の問題点に鑑み、ヒ
ンジ部を中空成形品の端部以外に形成してアンダ
ーカツト部分を生じるものであつても、アンダー
カツト部分が薄肉にならず、強度の低下をきたす
ことがないうえ、成形後は金型から成形品を容易
に取出すことができるヒンジ付中空成形品の製造
方法を開発し、提供しようとするものである。 In view of these conventional problems, the present invention has been developed to prevent the undercut portion from becoming thin and to improve the strength even if the hinge portion is formed at a location other than the end of the hollow molded product to create an undercut portion. The object of the present invention is to develop and provide a method for manufacturing a hinged hollow molded product that does not cause deterioration and also allows the molded product to be easily taken out of the mold after molding.
問題点を解決するための手段
本発明は、上記の目的を達成するため、プラス
チツクをブロー成形してヒンジ付中空成形品を製
造する方法において、分割形式の一対の金型を閉
鎖してパリスンをブロー成形するに際し、パリス
ンの一部をスライド型に接触させた状態でスライ
ド型を一対の金型の合せ面上に内方に移動するこ
とにより、パリスンの一部を溶着するとともに圧
縮してヒンジを成形し、ブロー成形後一対の金型
を開き、かつスライド型を外方に移動して成形品
を取出すことを特徴とするヒンジ付中空成形品の
製造方法を開発した。Means for Solving the Problems In order to achieve the above object, the present invention provides a method for manufacturing a hinged hollow molded product by blow molding plastic, in which a pair of split-type molds are closed to form a parison. During blow molding, by moving the slide mold inward onto the mating surfaces of the pair of molds with part of the parison in contact with the slide mold, part of the parison is welded and compressed to create a hinge. We have developed a method for manufacturing hinged hollow molded products, which is characterized by molding a molded product, opening a pair of molds after blow molding, and removing the molded product by moving a slide mold outward.
作 用
分割形式の一対の金型の間にパリスンを配置し
て型締めを開始すると、そのヒンジ部を成形する
ハリスンが溶着され、かつ内方に移動するが、そ
の過程においてヒンジ部はスライド型よつてそれ
を押し縮める方向に圧縮される。このため、ヒン
ジ部にアンダーカツト部があつても、成形時に薄
肉にならず、強度が損なわれることがない。ま
た、成形後成形品を取出す際には、一対の金型を
開くとともに、スライド型を外方に移動するの
で、ヒンジ部にアンダーカツト部があつても、全
く支障なく容易に成形品を外すことができる。Action When the Parison is placed between a pair of split-type molds and mold clamping begins, the Harrison that forms the hinge part is welded and moves inward, but in the process, the hinge part is attached to the slide mold. Therefore, it is compressed in the direction of compressing it. Therefore, even if there is an undercut portion in the hinge portion, the thickness will not become thin during molding, and the strength will not be impaired. In addition, when removing the molded product after molding, the pair of molds is opened and the slide mold is moved outward, so even if there is an undercut in the hinge, the molded product can be easily removed without any problems. be able to.
実施例 本発明の実施例を図面について説明する。Example Embodiments of the present invention will be described with reference to the drawings.
第１図ないし第３図において、１，１′は分割
形式の一対の金型であり、１はその一方の金型、
１′はその他方の金型であつて、一方の金型１は
中空部成形凸型キヤビテイ１ａを、他方の金型
１′は同じく凹型キヤビテイ１ａを有しており、
１ｂは一方の金型１の金型合せ面、１b′は他方の
金型１′の金型合せ面である。上記他方の金型
１′の背面側は支持軸２を介して支持板３に連結
されており、支持軸２と支持板３との間には弾性
部材４が介在されている。 In Figures 1 to 3, 1 and 1' are a pair of split-type molds, 1 is one of the molds,
1' is the other mold, one mold 1 has a convex cavity 1a for molding a hollow part, and the other mold 1' also has a concave cavity 1a,
1b is a mold mating surface of one mold 1, and 1b' is a mold mating surface of the other mold 1'. The back side of the other mold 1' is connected to a support plate 3 via a support shaft 2, and an elastic member 4 is interposed between the support shaft 2 and the support plate 3.
また、上記一方の金型１にはヒンジ成形キヤビ
テイ１ｃが形成されており、このヒンジ成形キヤ
ビテイ１ｃには、ヒンジにリベツト取付のための
厚肉部成形キヤビテイ１ｄが形成されている。５
はスライド型であつて、このスライド型５は一方
の金型１側のヒンジ成形キヤビテイ１ｃに対向す
るものであつて、ヒンジ成形キヤビテイ１ｃに対
向するヒンジ成形キヤビテイ５ｃが形成されてい
る。６は押圧杆であつて、この押圧杆６の傾斜面
がスライド型５の背面側傾斜面に接するようにな
つており。押圧杆６は前記支持板３に当接してい
る。７はブローノズル、８は押出ヘツド、９はパ
リスンである。 Further, a hinge molding cavity 1c is formed in one of the molds 1, and a thick wall molding cavity 1d for attaching a rivet to the hinge is formed in this hinge molding cavity 1c. 5
is a slide mold, and this slide mold 5 faces the hinge molding cavity 1c on one side of the mold 1, and has a hinge molding cavity 5c opposite to the hinge molding cavity 1c. 6 is a pressing rod, and the inclined surface of this pressing rod 6 is in contact with the inclined surface on the back side of the slide mold 5. The pressing rod 6 is in contact with the support plate 3. 7 is a blow nozzle, 8 is an extrusion head, and 9 is a parison.
以上のように構成された分割形式の一対の金型
を用いてヒンジ付中空成形品を成形するには、押
出ヘツド８からパリスン９を押出して一方の金型
１と他方の金型１′に配置し、他方の金型１′を一
方の金型１に合せる方向に支持板３を押し、型締
めを開始する。この際、支持板３は弾性部材４を
介して連結されているので、型締めの圧力が一定
に保持される。型締めを開始すると、一方の金型
１のヒンジ成形キヤビテイ１ｃとスライド型５の
ヒンジ成形キヤビテイ５ｃによつてヒンジ付近の
パリスンは溶着されるとともに内方に移動する。
この過程において、スライド型５は押圧杆６の摺
動面６′をスライドして分割金型１，１′の合せ面
１ｂ，１b′に沿つて内方に向かつて次第に移動し
ていくので、ヒンジ部はそれが押し締められる方
向に圧縮される。このため、ヒンジ部付近のアン
ダーカツトＵ部分が薄肉とならない。型締め完了
後は、ブローノズル７から空気を圧入してブロー
成形を行い、一対の金型を開いて成形品を取出す
が、この際にスライド型５が外方に移動するの
で、ヒンジ部に厚肉部が成形されてアンダーカツ
トがあつても、成形品を全く支障なく容易に取出
すことができる。 In order to mold a hinged hollow molded product using the pair of split-type molds configured as described above, the parison 9 is extruded from the extrusion head 8 and inserted into one mold 1 and the other mold 1'. The support plate 3 is pushed in a direction to align the other mold 1' with the one mold 1, and mold clamping is started. At this time, since the support plate 3 is connected via the elastic member 4, the mold clamping pressure is maintained constant. When mold clamping is started, the parison near the hinge is welded by the hinge molding cavity 1c of one mold 1 and the hinge molding cavity 5c of the slide mold 5 and moves inward.
In this process, the slide mold 5 slides on the sliding surface 6' of the pressing rod 6 and gradually moves inward along the mating surfaces 1b, 1b' of the split molds 1, 1'. The hinge portion is compressed in the direction in which it is squeezed. Therefore, the undercut U portion near the hinge portion does not become thin. After mold clamping is completed, air is forced in from the blow nozzle 7 to perform blow molding, and the pair of molds is opened to take out the molded product. At this time, the slide mold 5 moves outward, so the hinge part Even if a thick part is molded and there is an undercut, the molded product can be easily taken out without any problem.
第４図には本発明の方法により製造された成形
品が例示されている。すなわち、１０はその成形
品であるケースの蓋体であつて、１１はケースの
本体である。蓋体１０のヒンジ１２にはリベツト
取付のための厚肉部１３が形成されている。１４
はヒンジ１２を本体１１側に固定するためのリベ
ツトである。１５はヒンジ収納リセスである。 FIG. 4 illustrates a molded article manufactured by the method of the present invention. That is, 10 is the lid of the case which is the molded product, and 11 is the main body of the case. The hinge 12 of the lid body 10 is formed with a thick portion 13 for attaching a rivet. 14
are rivets for fixing the hinge 12 to the main body 11 side. 15 is a hinge storage recess.
なお、スライド型５の駆動手段は、上記実施例
のほか公知の油圧シリンダ等を用いることがで
き、また、スライド型５の移動は一対の金型の閉
鎖前または閉鎖後のいずれであつてもよい。 In addition to the above embodiments, a known hydraulic cylinder or the like can be used as the driving means for the slide mold 5, and the slide mold 5 can be moved either before or after the pair of molds are closed. good.
発明の効果
本発明は、前記のように、プラスチツクをブロ
ー成形してヒンジ付中空成形品を製造する方法に
おいて、分割形式の一対の金型を閉鎖してパリス
ンをブロー成形するに際し、パリスンの一部をス
ライド型に接触させた状態でスライド型を一対の
金型の合せ面上に内方に移動することにより、パ
リスンの一部を溶着するとともに圧縮してヒンジ
を成形し、ブロー成形後一対の金型を開き、かつ
スライド型を外方に移動して成形品を取出す方法
であるから、ヒンジ部付近にエンダーカツトを有
するものであつても、アンダーカツト部分が薄肉
にならず、強度の低下をきたすことがないうえ、
成形後は金型から成形品を容易に取出すことがで
きる効果を奏するものである。Effects of the Invention As described above, in the method of manufacturing a hinged hollow molded product by blow molding plastic, when the pair of split-type molds are closed and the parison is blow-molded, one part of the parison is By moving the slide mold inward onto the mating surfaces of the pair of molds with the part in contact with the slide mold, a part of the parison is welded and compressed to form a hinge, and after blow molding, the pair This method involves opening the mold and moving the slide mold outward to take out the molded product, so even if the undercut part has an ender cut near the hinge, the undercut part will not become thin and the strength will be improved. In addition to not causing any deterioration,
After molding, the molded product can be easily taken out from the mold.
第１図ないし第３図は本発明の製造方法を実施
するための装置を示す断面図であつて、順次成形
工程の態様を表しているものである。第４図は製
造された成形品の一例を示す断面斜視図である。
１……分割形式の一方の金型、２……その他方
の金型、１ｃ……ヒンジ成形キヤビテイ、１ｄ…
…厚肉部成形キヤビテイ、５……スライド型、５
ｃ……ヒンジ成形キヤビテイ。
FIGS. 1 to 3 are cross-sectional views showing an apparatus for carrying out the manufacturing method of the present invention, and show aspects of the sequential molding process. FIG. 4 is a cross-sectional perspective view showing an example of the manufactured molded product. 1... One mold of split type, 2... Other mold, 1c... Hinge molding cavity, 1d...
...Thick wall molding cavity, 5...Slide type, 5
c...Hinge molding cavity.
Claims (1)
成形品を製造する方法において、分割形式の一対
の金型を閉鎖してパリスンをブロー成形するに際
し、パリスンの一部をスライド型に接触させた状
態でスライド型を一対の金型の合せ面上に内方に
移動することにより、パリスンの一部を溶着する
とともに圧縮してヒンジを成形し、ブロー成形後
一対の分割金型を開き、かつスライド型を外方に
移動して成形品を取出すことを特徴とするヒンジ
付中空成形品の製造方法。1 In a method of manufacturing a hinged hollow molded product by blow molding plastic, when a pair of split-type molds is closed and a parison is blow-molded, a part of the parison is slid with a part of the parison in contact with the slide mold. By moving the mold inward onto the mating surfaces of the pair of molds, a part of the parison is welded and compressed to form a hinge, and after blow molding, the pair of split molds is opened and the sliding mold is opened. A method for producing a hinged hollow molded product, characterized in that the molded product is removed by moving outward.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61200007A JPS63165117A (en) | 1986-08-28 | 1986-08-28 | Manufacture of hinged hollow-molded item |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61200007A JPS63165117A (en) | 1986-08-28 | 1986-08-28 | Manufacture of hinged hollow-molded item |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63165117A JPS63165117A (en) | 1988-07-08 |
| JPH0446737B2 true JPH0446737B2 (en) | 1992-07-30 |
Family
ID=16417241
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61200007A Granted JPS63165117A (en) | 1986-08-28 | 1986-08-28 | Manufacture of hinged hollow-molded item |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63165117A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP7194892B2 (en) * | 2018-09-06 | 2022-12-23 | キョーラク株式会社 | tubular shaped body |
-
1986
- 1986-08-28 JP JP61200007A patent/JPS63165117A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63165117A (en) | 1988-07-08 |
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