JPH0825469A - Mold structure of hollow molding machine - Google Patents
Mold structure of hollow molding machineInfo
- Publication number
- JPH0825469A JPH0825469A JP16643794A JP16643794A JPH0825469A JP H0825469 A JPH0825469 A JP H0825469A JP 16643794 A JP16643794 A JP 16643794A JP 16643794 A JP16643794 A JP 16643794A JP H0825469 A JPH0825469 A JP H0825469A
- Authority
- JP
- Japan
- Prior art keywords
- mold
- molds
- parts
- undercut
- molding machine
- 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.)
- Pending
Links
Landscapes
- Moulds For Moulding Plastics Or The Like (AREA)
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は中空成形機の金型構造
に係り、とりわけ、ボトル等の中空成形品をダイレクト
ブロー法にて成形する中空成形機において、金型の底部
が上下動できる構造であって、吹き込み完了してボトル
内圧を大気に放出した後下部バリを除去し、型開時に底
部のみを下降させ、型開時のアンダーカットによるボト
ルの変形を防ぐようにしたものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold structure of a hollow molding machine, and more particularly to a hollow molding machine for molding a hollow molded product such as a bottle by a direct blow method, in which the bottom of the mold can move up and down. In addition, after the blowing is completed and the internal pressure of the bottle is released to the atmosphere, the lower burr is removed and only the bottom portion is lowered when the mold is opened to prevent the deformation of the bottle due to the undercut when the mold is opened.
【０００２】[0002]
【従来の技術】中空成形機は押出機から加熱溶融した樹
脂をパリソンとして押出し、このパリソンを二つ割りし
た金型で挟んで型締をし、金型の口金から露出するパリ
ソンにブローピンを押し込んで所定圧のエアを吹き込む
ことにより、パリソンが膨満して金型内面に付着し、こ
れによりキャビティの形状に沿った成形がなされ、これ
を冷却して型開きすることにより中空成形品を得る装置
である。2. Description of the Related Art A blow molding machine extrudes a resin that has been heated and melted from an extruder as a parison, sandwiches the parison with a mold that is divided into two parts, and clamps the mold. By blowing air of pressure, the parison expands and adheres to the inner surface of the mold, thereby molding according to the shape of the cavity, and cooling this to open the mold to obtain a hollow molded product. .
【０００３】しかして、パリソンは溶融した樹脂の筒体
であるから、押出機から垂れ下がるパリソンを金型で挟
むと、金型の上下部に所謂バリが発生する。そこで、上
部バリを除去するには、図６に示すように、ブローピン
６のカッティングスリーブ６ａと金型１，２のカッティ
ングプレート（口金）１ａ，２ａとの突き合わせにて上
部バリ５ｄを切断する。However, since the parison is a cylindrical body of molten resin, when a parison hanging from the extruder is sandwiched between molds, so-called burrs are generated in the upper and lower parts of the mold. Therefore, in order to remove the upper burr, as shown in FIG. 6, the upper burr 5d is cut by abutting the cutting sleeve 6a of the blow pin 6 and the cutting plates (bases) 1a and 2a of the molds 1 and 2.
【０００４】そして、下部バリを除去するには、金型の
底部に下部バリトリミング機構を配置することがある。
これは、図７，８に示すように、例えば、金型１，２の
下部にパーティングラインＰで接触する面をそれぞれ切
削して凹部１ｂ，２ｂをそれぞれ形成し、かつ、その凹
部１ｂ，２ｂ内に突出する凹凸面３ａを有するトリミン
グレバー３を一方の金型１の下部に昇降可能に配置し、
トリミングレバー３にシリンダ４に係合するピストンロ
ッド４ａを連結し、シリンダ４は金型１又はプラテンに
支持体１ｃを介して支持させ、図８に示すように、凹部
１ｂ，２ｂ内にはみ出た下部バリ５ｅをトリミングレバ
ー３の凹凸面３ａで咬持して下方へ引き下げ除去するの
である。To remove the lower burr, a lower burr trimming mechanism may be arranged at the bottom of the mold.
As shown in FIGS. 7 and 8, for example, the surfaces contacting with the parting line P are cut under the molds 1 and 2 to form recesses 1b and 2b, and the recesses 1b and 2b are formed. A trimming lever 3 having an uneven surface 3a protruding into 2b is arranged under one mold 1 so as to be able to move up and down.
A piston rod 4a that engages with a cylinder 4 is connected to the trimming lever 3, and the cylinder 4 is supported by a mold 1 or a platen via a support 1c, and as shown in FIG. 8, it protrudes into the recesses 1b and 2b. The lower burr 5e is bitten by the uneven surface 3a of the trimming lever 3 and pulled down to be removed.
【０００５】[0005]
【発明が解決しようとする課題】しかしながら、ボトル
容器の成形に際しては、ボトルの起立性を良くするため
に、図８に示すように、成形品５（ボトル）の底部５ｂ
が逆凹字状になっている。したがって、この底部５ｂの
へこみが、吹込完了後、金型１，２を開く際にアンダー
カットとなり、図９に示すように、金型１，２のどちら
かに引っ張られて無理矢理離型することとなるために、
ブローピン６に吊支された状態にある成形品５の首部５
ａが変形することがある。However, in forming the bottle container, in order to improve the uprightness of the bottle, as shown in FIG. 8, the bottom 5b of the molded product 5 (bottle) is formed.
Has an inverted concave shape. Therefore, the indentation of the bottom portion 5b becomes an undercut when the molds 1 and 2 are opened after the blowing is completed, and as shown in FIG. 9, it is pulled by one of the molds 1 and 2 and forcedly released. To be
The neck 5 of the molded product 5 suspended from the blow pin 6
a may be deformed.
【０００６】ボトルの首部５ａは、図６に示すように、
一般的に胴部５ｃよりも肉厚が大きくなり、金型冷却構
造からも冷却性が悪いことから、胴部５ｃに比べると冷
却に時間がかかるために、離型時に首部５ａが曲がり、
不良品となることが多い。そこで、首部５ａが完全に冷
却された後離型するしかないため、成形サイクルの向上
が図れず、成形コストに悪影響を与える。The neck portion 5a of the bottle is, as shown in FIG.
Generally, since the wall thickness is larger than that of the body portion 5c and the cooling property is poor even from the mold cooling structure, it takes longer time to cool than the body portion 5c. Therefore, the neck portion 5a bends at the time of mold release,
Often defective. Therefore, the neck portion 5a must be released after it is completely cooled, so that the molding cycle cannot be improved and the molding cost is adversely affected.
【０００７】なお、射出中空成形法では、図１０に示す
ように、予め下部バリを発生しない形状、すなわち、下
端部を閉じたプリフォーム７を作成し、これを二つ割り
の金型１，２で挟持して型締めし、吹込み完了後、型開
き前に底型８を下降させて成形品５を取り出している。
ただし、底型８は一体品であって金型１，２のようにパ
ーティングラインＰで２分割はなされていない。In the injection blow molding method, as shown in FIG. 10, a preform 7 in which a lower burr is not generated, that is, a preform 7 having a closed lower end is prepared in advance, and the preform 7 is divided into two dies 1 and 2. After the completion of blowing, the bottom mold 8 is lowered and the molded product 5 is taken out.
However, the bottom mold 8 is an integral product and is not divided into two parts by the parting line P unlike the molds 1 and 2.
【０００８】そこで、この発明は、ダイレクトブロー法
におけるボトルの首部等の、肉厚部の離型時における変
形を防止して成形サイクルの向上を図ることを目的とし
た中空成形機の金型構造を提供する。Therefore, the present invention has a die structure of a hollow molding machine for the purpose of improving the molding cycle by preventing the deformation of the thick portion such as the neck portion of the bottle in the direct blow method at the time of mold release. I will provide a.
【０００９】[0009]
【課題を解決するための手段】この発明にかかる中空成
形機の金型構造は、請求項１によれば、底部にアンダー
カットを有するボトル等の中空成形品をダイレクトブロ
ー法にて成形する中空成形機において、金型底部のアン
ダーカット部の底型をキャビティ部と同様に二つ割りし
てそれぞれ昇降可能に金型に吊支したことを特徴とす
る。According to a first aspect of the present invention, there is provided a mold structure for a hollow molding machine, wherein a hollow molded product such as a bottle having an undercut at the bottom is molded by a direct blow method. In the molding machine, the bottom die of the undercut portion of the die bottom portion is divided into two in the same manner as the cavity portion, and each is suspended and supported on the die so as to be vertically movable.
【００１０】また、請求項２によれば、底部にアンダー
カットを有するボトル等の中空成形品をダイレクトブロ
ー法にて成形する中空成形機において、金型底部のアン
ダーカット部の底型をキャビティ部と同様に二つ割りし
てそれぞれ昇降可能に金型に吊支し、該底型はそれぞれ
にパーティングラインでパリソンを切断する切断部及び
バリ収納部が形成され、かつ、該バリ収納部内に進退す
るトリミングレバーが昇降可能に設けられていることを
特徴とする。According to a second aspect of the present invention, in a hollow molding machine for molding a hollow molded product such as a bottle having an undercut on the bottom by a direct blow method, the bottom die of the undercut portion of the die bottom is a cavity portion. Similarly, it is divided into two and suspended in a mold so that it can be moved up and down, and the bottom mold is formed with a cutting part and a burr accommodating part for cutting the parison at the parting line, and moves forward and backward in the burr accommodating part. The trimming lever is provided so as to be able to move up and down.
【００１１】[0011]
【作用】請求項１に記載の発明では、離型時に底型を金
型から下降させ、次いで金型を左右に開くと、成形品の
アンダーカットが底型に干渉されることなく、したがっ
て、成型品の首部が変形する不都合を生じさせない。In the invention described in claim 1, when the bottom mold is lowered from the mold at the time of releasing the mold and then the mold is opened to the left and right, the undercut of the molded product does not interfere with the bottom mold. The inconvenience of deforming the neck of the molded product does not occur.
【００１２】請求項２に記載の発明では、下部バリは成
形時に二つ割りの底型で噛み切られてトリミングレバー
に付着し、この下部バリは成型品の離型前にトリミング
レバーを下降させることにより排除できる。In the second aspect of the present invention, the lower burr is bitten by the halved bottom mold at the time of molding and adheres to the trimming lever, and the lower burr is lowered by the trimming lever before releasing the molded product. Can be eliminated.
【００１３】[0013]
【実施例】以下この発明の実施例を図１〜５に基づき説
明する。図１に示すように、ボトル等の中空成形品１０
を成形するキャビティ１１を内面に形成した二つ割りの
金型１２，１３の底部に、キャビティ１１と連通する開
口部１４，１５を形成する。この開口部１４，１５に嵌
合する二つ割りした底型１６，１７をそれぞれシリンダ
ー１８，１９に係合するピストンロッド２０，２１にて
昇降可能に金型１２，１３の下部にそれぞれ配置する。Embodiments of the present invention will be described below with reference to FIGS. As shown in FIG. 1, a hollow molded product 10 such as a bottle
Openings 14 and 15 communicating with the cavity 11 are formed at the bottoms of the halves of the molds 12 and 13 having the cavity 11 for molding the inner surface formed therein. The bottom molds 16 and 17 that are fitted into the openings 14 and 15 are arranged below the molds 12 and 13 so that they can be moved up and down by piston rods 20 and 21 that engage with the cylinders 18 and 19, respectively.
【００１４】シリンダー１８，１９は金型１２，１３の
底面に連結した支持体２２，２３に支持され、かつ、底
型１６，１７が金型１２，１３から下降できるストロー
クがシリンダー１８，１９との間に形成されている。し
たがって、ピストンロッド２０，２１をシリンダー１
８，１９に引き込めると底型１６，１７は金型１２，１
３から下方へ移動できる。The cylinders 18 and 19 are supported by supports 22 and 23 connected to the bottom surfaces of the molds 12 and 13, and the strokes by which the bottom molds 16 and 17 can descend from the molds 12 and 13 are cylinders 18 and 19, respectively. Is formed between. Therefore, the piston rods 20 and 21 are connected to the cylinder 1
When the bottom molds 16 and 17 are pulled into the molds 8 and 19, the molds 12 and 1
You can move down from 3.
【００１５】底型１６，１７は、パーティング面で下部
バリ５ｅに対面する鋭角断面の下部バリ切断部２４，２
５が底型１６，１７にそれぞれ形成されるとともに、こ
の下部バリ切断部２４，２５に沿って下部バリ収納部２
６，２７が形成されている。そして底型１６側の下部バ
リ収納部２６にトリミングレバー２８が昇降可能に挿入
されている。The bottom molds 16 and 17 have a lower burr cutting portion 24 or 2 having an acute-angled section which faces the lower burr 5e on the parting surface.
5 are formed on the bottom molds 16 and 17, respectively, and the lower burr accommodating portion 2 is formed along the lower burr cutting portions 24 and 25.
6, 27 are formed. A trimming lever 28 is inserted in the lower burr storage portion 26 on the bottom die 16 side so as to be able to move up and down.
【００１６】トリミングレバー２８はシリンダー２９に
伸縮可能に係合するピストンロッド３０に接続した継手
３１に連結したロッド３２の上端部に連結されている。
シリンダー２９は支持体２２に固定された支持体２２ａ
に固定されている。トリミングレバー２８には下部バリ
収納部２７に対面する鋸歯面３３が形成されており、こ
の鋸歯面３３が下部バリ５ｅに食い込んでこれを引き降
ろすことができる。鋸歯面３３は鋸歯に限定されず、凹
凸又は粗面であってもよい。The trimming lever 28 is connected to the upper end of a rod 32 which is connected to a joint 31 connected to a piston rod 30 which extends and contracts with a cylinder 29.
The cylinder 29 is a support 22a fixed to the support 22.
It is fixed to. The trimming lever 28 is formed with a saw tooth surface 33 facing the lower burr accommodating portion 27, and this saw tooth surface 33 can bite into the lower burr 5e and pull it down. The saw-tooth surface 33 is not limited to the saw-tooth and may be an uneven surface or a rough surface.
【００１７】なお、シリンダー１８，１９，２９にはそ
れぞれ、スピードコントローラー３４，３５と電磁弁３
６，３７を介在して気圧又は液圧供給源３８と結ぶ配管
が接続されている。また、底型１６，１７とトリミング
レバー２８の断面内には冷却水が流れる冷却管３９，４
０，４１がそれぞれ埋設されている。これらの冷却管３
９〜４１にはホース等の可撓性の配管が接続されてその
内部を冷却水が流通する。The cylinders 18, 19 and 29 have speed controllers 34 and 35 and solenoid valves 3 respectively.
Pipes connected to the atmospheric pressure or hydraulic pressure supply source 38 via the valves 6, 37 are connected. In addition, cooling pipes 39, 4 through which cooling water flows are formed in the cross sections of the bottom molds 16, 17 and the trimming lever 28.
0 and 41 are buried respectively. These cooling tubes 3
A flexible pipe such as a hose is connected to 9 to 41, and cooling water flows through the inside.
【００１８】次に上記実施例の作用を説明すると、金型
１２，１３を開いて押出機から押し出される筒形のパリ
ソンを挟持し、金型１２，１３を閉じるとパリソン上部
は金型の口金１２ａ，１３ａに支持され、パリソン下部
は底型１６，１７の下部バリ切断部２４，２５に噛まれ
てそれぞれ閉じられる。したがって、下部バリ５ｅは下
部バリ収納部２７において鋸歯面３１に密着する（図
１）。Explaining the operation of the above embodiment, the molds 12 and 13 are opened to hold the cylindrical parison extruded from the extruder, and when the molds 12 and 13 are closed, the upper part of the parison is the die of the mold. The lower parts of the parison are supported by 12a and 13a, and are bitten by the lower burr cutting parts 24 and 25 of the bottom molds 16 and 17 to be closed. Therefore, the lower burr 5e comes into close contact with the sawtooth surface 31 in the lower burr accommodating portion 27 (FIG. 1).
【００１９】そこで、金型１２，１３の口金１２ａ，１
３ａに挟持されたパリソンにブローピン６を挿入して所
定圧力の空気を吹き込むと、パリソンが膨満してキャビ
ティ１１に沿って成形される。Therefore, the caps 12a, 1 of the molds 12, 13 are
When the blow pin 6 is inserted into the parison sandwiched by 3a and air having a predetermined pressure is blown into the parison, the parison expands and is molded along the cavity 11.
【００２０】成形品の冷却時間（吹込時間）が過ぎると
吹込みの電磁弁を切り替えて成形品の内圧を大気に放出
させるとともに、離型のため、図３に示すように、初め
にシリンダー２９を作動させてそのピストンロッド３０
でトリミングレバー２８を金型１２，１３の下方へ引き
下げ、下部バリ５ｅを除去する。When the cooling time (blowing time) of the molded product has passed, the electromagnetic valve for blowing is switched to release the internal pressure of the molded product to the atmosphere, and for releasing the mold, as shown in FIG. The piston rod 30
The trimming lever 28 is pulled down below the dies 12 and 13 to remove the lower burr 5e.
【００２１】ついで、図４に示すように、シリンダー１
８，１９を成形品内部の圧力が大気圧になった後作動さ
せて、そのピストンロッド２０，２１で底型１６，１７
を金型１２，１３の下方へアンダーカット分を逃げる分
の所定のストロークにて引き下げる。Next, as shown in FIG. 4, the cylinder 1
8 and 19 are operated after the pressure inside the molded product reaches atmospheric pressure, and the bottom rods 16 and 17 are driven by the piston rods 20 and 21.
Is pulled down below the dies 12, 13 with a predetermined stroke to escape the undercut.
【００２２】そこで、図５に示すように、金型１２，１
３を左右に開くと、成形品１０の底部１０ｂが底型１
６，１７の上部に当接することはないので、成形品１０
がどちらかの金型１２，１３に引きずられてパーティン
グラインＰから左右に揺動することはなく、したがっ
て、首部１０ａの変形が生じることはない。Therefore, as shown in FIG.
3 is opened to the left and right, the bottom 10b of the molded product 10 is the bottom mold 1
Since it does not come in contact with the upper parts of 6, 17
Will not be dragged by either of the molds 12 and 13 to swing right and left from the parting line P, and therefore the neck portion 10a will not be deformed.
【００２３】かくして、筒形のパリソンをそのまま金型
１２，１３に咬持させて下部バリ５ｅを型締した後切断
し、成形品１０の離型時にはトリミングレバー２８が下
部バリ５ｅを除去し、ついで、底型１６，１７が下方へ
移動することにより、底型１６，１７が成形品１０の底
部１０ｂのアンダーカットに干渉することのないように
した構成であるから、離型時に下部バリ５ｅの除去と首
部１０ａの変形を同時に防止することができる。Thus, the cylindrical parison is held by the molds 12 and 13 as it is, the lower burr 5e is clamped and then cut, and the trimming lever 28 removes the lower burr 5e when the molded product 10 is released. Next, since the bottom molds 16 and 17 are moved downward, the bottom molds 16 and 17 do not interfere with the undercut of the bottom portion 10b of the molded product 10. And the deformation of the neck portion 10a can be prevented at the same time.
【００２４】[0024]
【発明の効果】以上説明したこの発明によれば、金型の
底部に昇降可能な底型を、二つ割りしてパリソンを切断
可能にするとともに、離型時には金型から退出させるこ
とができるから、底型が成形品のアンダーカットに干渉
して首部が変形するのを防止して成形不良を発生するこ
とがなく、首部の完全冷却がなされなくても金型から取
り出すことができるため、成形サイクルのより一層の向
上ができる。According to the present invention described above, the bottom mold which can be moved up and down on the bottom of the mold is divided into two parts so that the parison can be cut, and the mold can be withdrawn from the mold at the time of mold release. The bottom mold does not interfere with the undercut of the molded product to prevent the neck from deforming, resulting in defective molding, and the mold can be taken out from the mold even if the neck is not completely cooled. Can be further improved.
【図１】この発明の実施例を示す一部断面側面図FIG. 1 is a partial sectional side view showing an embodiment of the present invention.
【図２】図１のＰ−Ｐ断面図FIG. 2 is a sectional view taken along line P-P of FIG.
【図３】作用説明図FIG. 3 is an operation explanatory diagram
【図４】作用説明図[Fig. 4] Operation explanatory diagram
【図５】作用説明図[Fig. 5] An explanatory view of action
【図６】成形品の首部成形断面図FIG. 6 is a sectional view of the neck of the molded product.
【図７】従来のトリミング機構の正面図FIG. 7 is a front view of a conventional trimming mechanism.
【図８】従来の成形例の説明図FIG. 8 is an explanatory view of a conventional molding example.
【図９】従来の成形例の説明図FIG. 9 is an explanatory view of a conventional molding example.
【図１０】従来の射出成形法による成形例の説明図FIG. 10 is an explanatory view of a molding example by a conventional injection molding method.
５ｅ…下部バリ １０…中空成形品 １１…キャビティ １２，１３…金型 １４，１５…開口部 １６，１７…底型 １８，１９，２９…シリンダー ２２，２３…支持体 ２４，２５…下部バリ切断部 ２６，２７…下部バリ収納部 ２８…トリミングレバー ３３…鋸歯面 5e ... Lower burr 10 ... Hollow molded product 11 ... Cavity 12,13 ... Mold 14,15 ... Opening 16,17 ... Bottom mold 18,19, 29 ... Cylinder 22,23 ... Support 24,25 ... Lower burr cutting Parts 26, 27 ... Lower burr storage part 28 ... Trimming lever 33 ... Sawtooth surface
Claims (2)
の中空成形品をダイレクトブロー法にて成形する中空成
形機において、金型底部のアンダーカット部の底型をキ
ャビティ部と同様に二つ割りしてそれぞれ昇降可能に金
型に吊支したことを特徴とする中空成形機の金型構造。1. A hollow molding machine for molding a hollow molded product such as a bottle having an undercut on the bottom by a direct blow method, wherein the bottom mold of the undercut part of the mold bottom is divided into two parts in the same manner as the cavity part. A mold structure for a hollow molding machine, which is suspended from a mold so that it can be raised and lowered.
の中空成形品をダイレクトブロー法にて成形する中空成
形機において、金型底部のアンダーカット部の底型をキ
ャビティ部と同様に二つ割りしてそれぞれ昇降可能に金
型に吊支し、該底型はそれぞれにパーティングラインで
パリソンを切断する切断部及びバリ収納部が形成され、
かつ、該バリ収納部内に進退するトリミングレバーが昇
降可能に設けられていることを特徴とする中空成形機の
金型構造。2. A hollow molding machine for molding a hollow molded product such as a bottle having an undercut on the bottom by a direct blow method, in which the bottom mold of the undercut part of the mold bottom is divided into two parts in the same manner as the cavity part. Suspended in a mold so that it can move up and down, the bottom mold is formed with a cutting portion and a burr accommodating portion for cutting the parison at the parting line,
Further, a die structure of a hollow molding machine, wherein a trimming lever for advancing and retracting is provided in the burr accommodating portion so as to be able to move up and down.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16643794A JPH0825469A (en) | 1994-07-19 | 1994-07-19 | Mold structure of hollow molding machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16643794A JPH0825469A (en) | 1994-07-19 | 1994-07-19 | Mold structure of hollow molding machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0825469A true JPH0825469A (en) | 1996-01-30 |
Family
ID=15831395
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16643794A Pending JPH0825469A (en) | 1994-07-19 | 1994-07-19 | Mold structure of hollow molding machine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0825469A (en) |
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