JPH11277612A - Blow molding method - Google Patents
Blow molding methodInfo
- Publication number
- JPH11277612A JPH11277612A JP10398898A JP10398898A JPH11277612A JP H11277612 A JPH11277612 A JP H11277612A JP 10398898 A JP10398898 A JP 10398898A JP 10398898 A JP10398898 A JP 10398898A JP H11277612 A JPH11277612 A JP H11277612A
- Authority
- JP
- Japan
- Prior art keywords
- parison
- mold
- male
- female
- pinch
- 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.)
- Granted
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】本発明は、雌雄両金型を用いて、
自動車用エアスポイラやパンバー等断面形状が凹状で、
しかもこの凹状部分が深い形状をもっている合成樹脂製
の中空成形品をブロー成形するブロー成形方法に関す
る。BACKGROUND OF THE INVENTION The present invention relates to a
The cross section of a car air spoiler or pan bar is concave,
Moreover, the present invention relates to a blow molding method for blow molding a hollow molded article made of a synthetic resin in which the concave portion has a deep shape.
【０００２】[0002]
【従来の技術】図５に示すように、合成樹脂製の中空成
形品１の両端部に腕状の屈曲部２、２を一体成形した自
動車用エアスポイラやバンパー等を成形する場合、図６
及び図７に示す金型１０を使用する。2. Description of the Related Art As shown in FIG. 5, when an air spoiler or a bumper for an automobile is formed by integrally forming arm-shaped bent portions 2 and 2 at both ends of a hollow molded product 1 made of synthetic resin, FIG.
And the mold 10 shown in FIG. 7 is used.
【０００３】この金型１０は中空成形品１の外面を成形
するキャビティ１１を備えた雌型１２と、中空成形品１
の内面を成形するコア１３を備えた雄型１４とから構成
されている。The mold 10 includes a female mold 12 having a cavity 11 for molding the outer surface of the hollow molded product 1,
And a male mold 14 having a core 13 for molding the inner surface of the mold.
【０００４】金型１０の上方には、パリソン１６を型開
き状態にある雌金型１２と雄金型１４との間に押出供給
するダイヘッド１５が位置しており、又、金型１０の下
方には、一対のピンチ装置１７、１８が位置して、この
ピンチ装置１７、１８のピンチバー１７ａ，１８ａによ
りパリソン１６の先端側を挟着するように構成されてお
り、このピンチバー１７ａ，１８ａによるパリソン１６
の挟着点Ｘは、パリソン１６の軸中心線Ｐ上に位置して
いる（図７参照）。A die head 15 for extruding a parison 16 between a female mold 12 and a male mold 14 in an open state is located above the mold 10. , A pair of pinch devices 17 and 18 are positioned so that the front end side of the parison 16 is pinched by the pinch bars 17a and 18a of the pinch devices 17 and 18, and the parison is formed by the pinch bars 17a and 18a. 16
Is located on the axis center line P of the parison 16 (see FIG. 7).
【０００５】そして、上記のように構成する金型１０に
よって中空成形品１を成形する場合、先ず図７に示すよ
うに、互いに型開きした雌金型１２と雄金型１４との間
に、ダイヘッド１５よりパリソン１６を、その下端部が
ピンチ装置１７、１８のピンチバー１７ａ，１８ａに対
向する位置よりも若干長目に押出射出し、次に、パリソ
ン１６の下端部をピンチバー１７ａ，１８ａによって、
挟着している。この状態で、ブローピン１９によりパリ
ソン１６内にプリブローを行い、雌雄両金型１２、１４
の型締めを行い（図７の状態）、中空成形品１の成形を
行っている。[0005] When the hollow molded article 1 is formed by the mold 10 having the above-described structure, first, as shown in FIG. The parison 16 is extruded from the die head 15 a little longer than the position where the lower end of the parison 16 faces the pinch bars 17a, 18a of the pinch devices 17, 18, and then the lower end of the parison 16 is moved by the pinch bars 17a, 18a.
It is pinched. In this state, pre-blow is performed in the parison 16 by the blow pin 19, and the male and female
(The state of FIG. 7), and the hollow molded article 1 is molded.
【０００６】このようなブロー成形では、雌金型１２側
が凹状、雄金型１４側が凸状となっているために、雌雄
両金型１２、１４を型締めしていくと、先ずパリソン１
６の片側が雄金型１４の片面１４ａに、上下部が雌金型
１２の開口縁１２ｂにそれぞれ接する。更に型締めが進
行すると、パリソン１６の他の片側が雌金型１２の型面
１２ａに接するようになり、型締め完了時には、雌金型
１２の開口縁１２ｂと雄金型１４の隅部１４ｂとの上下
に位置ずれしていることから、パリソン１６の上下部は
隅部１４ｂにて斜めに屈曲された状態となり、型面と接
しない部分が生ずる。In such blow molding, since the female mold 12 is concave and the male mold 14 is convex, when the male and female molds 12 and 14 are clamped, the parison 1
6 is in contact with one side 14a of the male mold 14, and the upper and lower portions are in contact with the opening edge 12b of the female mold 12, respectively. When the mold clamping further proceeds, the other side of the parison 16 comes into contact with the mold surface 12a of the female mold 12, and when the mold clamping is completed, the opening edge 12b of the female mold 12 and the corner 14b of the male mold 14 are formed. The upper and lower portions of the parison 16 are obliquely bent at the corners 14b, and there are portions that do not contact the mold surface.
【０００７】又、金型１０は通常冷却されており、パリ
ソン１６の型面に接した部分の温度は、接触により接触
していない部位より低下する。このため型面から離れて
位置する部分との間に温度差が生じ、又エアーブローに
よる延伸性にも差が生じ、パリソン１６を均一に延伸さ
せ難くなる。特に斜めに屈曲した上下部では、パリソン
表面積が型面の表面積より小さく、又金型１０に接した
部分の伸展性に余裕が生じにくいことから、他の部分に
比べて薄肉になり易く、場合によっては破裂して、全体
をエアブローすることができないことがあった、そこ
で、従来、上記のような点を改善すべく、たとえば、特
開昭５８―１０２７３５号公報或いは特開昭６１―７９
６１７号公報に記載された技術が提案されている。The mold 10 is normally cooled, and the temperature of the part of the parison 16 that is in contact with the mold surface is lower than that of the part that is not in contact due to the contact. For this reason, a temperature difference is generated between a portion located away from the mold surface, and a difference also occurs in stretchability by air blow, which makes it difficult to stretch the parison 16 uniformly. Particularly, in the upper and lower portions that are bent obliquely, the parison surface area is smaller than the surface area of the mold surface, and since the extensibility of the portion in contact with the mold 10 is less likely to be generated, the parison surface tends to be thinner than other portions. In some cases, the entire structure could burst and air blowing could not be performed. Therefore, in order to improve the above points, for example, Japanese Patent Application Laid-Open No. 58-102735 or Japanese Patent Application Laid-Open No. 61-79
No. 617 has proposed a technique.
【０００８】そして、前者の技術は、図８に示すよう
に、雌金型１２及び雄金型１４の間に位置するパリソン
１６の上下両端側をピンチ装置１７、１８のピンチバー
１７ａ，１８ａによって挟着した状態で、雌雄両金型１
２、１４の型締めを行い、中空成形体１を形成するもの
であるが、前記雌雄両金型１２、１４の型締めに同調し
て、ピンチバー１７ａ，１８ａを揺動させて、パリソン
１６の挟着点Ｘを雌雄両金型１２、１４内に送り込み、
このことによって、パリソン１６の雌雄両金型１２、１
４内への送り込み自由膨張を助け、雌雄両金型１２、１
４内でのパリソン１６の局部的延伸を防止して、偏肉の
少ない成形をしようとしている。In the former technique, as shown in FIG. 8, both upper and lower ends of a parison 16 located between a female mold 12 and a male mold 14 are pinched by pinch bars 17a, 18a of pinch devices 17, 18. While wearing it, both male and female molds 1
The hollow molded body 1 is formed by clamping the molds 2 and 14. The pinch bars 17 a and 18 a are swung in synchronization with the mold clamping of the male and female molds 12 and 14, and the parison 16 is clamped. The clamping point X is sent into the male and female molds 12, 14,
As a result, the male and female molds 12, 1
4 to help the free expansion of the mold,
In order to prevent the parison 16 from being locally stretched in the inside 4, the molding is to be performed with less uneven thickness.
【０００９】又、後者の技術は、図９に示すように、ダ
イヘッド１５の下部で雄金型１４の上部に当る位置と、
雄金型１４の下方位置とに、案内具２１、２２をそれぞ
れ雄金型１４に沿うように傾斜させて、エアーシリンダ
ー２３、２４などによりそれぞれ横方向に進退自在に設
けておき、雌雄金型１２、１４が型開き状態（図示状
態）にあるとき、ダイヘッド１５の直下に案内具２１を
前進位置させ、又案内具２２も雌雄両金型１２、１４間
に前進させておいて、ダイヘッド１５からパリソン１６
を押出すと、パリソン１６の上部は案内具２１に支えら
れて雄金型１４側に屈曲した状態で保持され、下部は案
内具２２に当って雄金型１４のコア１３の下側へと導か
れて、パリソン１６の上下部に余長成形を施して、雌雄
両金型１２、１４の型締め過程で生ずる引っ張り力によ
り薄肉となることを防止しようとしている。In the latter technique, as shown in FIG. 9, a position where the lower part of the die head 15 contacts the upper part of the male mold 14 is defined as follows.
The guides 21 and 22 are inclined at positions below the male mold 14 so as to extend along the male mold 14, respectively, and are provided so as to be able to advance and retreat in the lateral direction by air cylinders 23 and 24, respectively. When the molds 12 and 14 are in the mold open state (the state shown in the figure), the guide 21 is moved forward just below the die head 15, and the guide 22 is also advanced between the male and female molds 12 and 14. From Parison 16
Is pushed out, the upper part of the parison 16 is supported by the guide 21 and is held in a bent state toward the male mold 14, and the lower part hits the guide 22 and moves down to the lower side of the core 13 of the male mold 14. The upper and lower portions of the parison 16 are guided to form extra lengths so as to prevent the parison 16 from becoming thin due to the pulling force generated in the process of clamping the male and female molds 12 and 14.
【００１０】[0010]
【発明が解決しようとする課題】しかしながら、上記両
従来技術には、未だに解決すべき課題を包含している。
すなわち、図８に示す従来技術においては、ピンチバー
１７ａ，１８ａを揺動させて、パリソン１６の挟着点Ｘ
を送り込むことによって、パリソン１６の雌雄両金型１
２、１４内への送り込み自由膨張を助け、雌雄両金型１
２、１４内でのパリソン１６の局部的延伸を防止しよう
としたものであるが、ピンチバー１７ａ，１８ａの揺動
によりパリソン１６の挟着点Ｘを雌雄両金型１２、１４
側へ送り込んだときに、挟着点Ｘが鎖線示するようにパ
リソン１６の内部側にだれてしまうおそれがあり、成形
後所望の中空成形品１０が得られないおそれがある。However, both of the above prior arts still have problems to be solved.
In other words, in the prior art shown in FIG. 8, the pinch bars 17a and 18a are swung so that the pinch point X of the parison 16 is
, The male and female mold 1 of the parison 16
2 and 14 to help the free expansion of the feed into both molds
The purpose of the present invention is to prevent the parison 16 from being locally stretched in the inside and outside of the male and female molds 12 and 14 by swinging the pinch bars 17a and 18a.
When it is sent to the side, there is a possibility that the sandwiching point X may fall into the inner side of the parison 16 as indicated by a dashed line, and a desired hollow molded article 10 may not be obtained after molding.
【００１１】又、図９に示す従来技術は、パリソン１６
の上部を案内具２１で支え、下部を案内具２２に当って
雄金型１４のコア１３の下側へと導いて、パリソン１６
の上下部に余長成形を施して、雌雄両金型１２、１４の
型締め過程で生ずる引っ張り力により薄肉となることを
防止しようとするものであるが、パリソン１６のたとえ
ば上部において、たとえエアーブローしても、雌金型１
２側イがその重力により、雄金型側ロ側にたれてしま
い、しかも、雄金型側ロが案内具２１に接触し、しかも
プリブローがかかっているために、雄金型側ロが、雌金
型側イよりも厚くなる傾向となり、偏肉のある中空成形
品が成形されてしまう。Further, the prior art shown in FIG.
Of the male mold 14 is guided to the lower side of the core 13 of the male mold 14 by supporting the upper portion of the
The upper and lower parts of the parison 16 are formed with extra length so as to prevent them from becoming thin due to the tensile force generated in the process of clamping the male and female molds 12 and 14. Even if blown, female mold 1
Due to the gravity, the second side a is leaned against the male mold side B, and the male mold side B contacts the guide 21 and is pre-blowed. It tends to be thicker than the female mold side a, and a hollow molded article with uneven thickness is formed.
【００１２】そこで、本発明は、従来の偏肉のなく、し
かも所望の中空成形品が成形可能なブロー成形方法を提
供することを目的としている。Accordingly, an object of the present invention is to provide a conventional blow molding method capable of forming a desired hollow molded product without uneven thickness.
【００１３】[0013]
【課題を解決するための手段】本発明によるブロー成形
方法は、上記目的を達成すべく、所要深さのキャビティ
を有する雌金型とこの雌金型に収まるコアを備えた雄金
型との間に上方のダイヘッドからパリソンを押出射出さ
せて、該パリソンの上下両端部を、一対のピンチ装置の
ピンチバーによってそれぞれ前記パリソンの軸中心線上
において挟着し、その後、前記ピンチ装置によって前記
パリソンのピンチバーによる挟着部を前記パリソンの軸
中心線上から前記雄金型側に移動させてから前記雌雄両
金型の型締めを行って、この型締めが完了した時に前記
パリソン内をエアブローして、前記パリソンを所望の中
空成形品に成形するようにしたことを特徴とするもので
ある。SUMMARY OF THE INVENTION In order to achieve the above object, a blow molding method according to the present invention comprises a female mold having a cavity of a required depth and a male mold having a core which fits in the female mold. A parison is extruded and ejected from an upper die head in between, and upper and lower ends of the parison are pinched on respective axial centers of the parisons by pinch bars of a pair of pinch devices. The clamping part by moving the male and female molds from the center line of the parison to the male mold side from the center line of the parison, and performing mold clamping of the male and female molds. The parison is formed into a desired hollow molded article.
【００１４】この結果、本発明によれば、雌雄両金型の
間に投入されたパリソンの上下両端部の挟着部は、一対
のピンチ装置によりパリソンの軸中心線上から雄金型側
に横動させてから、雌雄両金型の型締め工程に入るため
に、パリソンは雄金型のコア部にほぼ沿った形すなわち
成形すべき中空成形体の深さ方向の角度に追従した形に
形作られて、パリソンの局部的伸びを押さえて、偏肉の
少ない所望の中空成形品を成形することができる。As a result, according to the present invention, the sandwiching portions at the upper and lower ends of the parison inserted between the male and female molds are laterally moved from the axial center line of the parison to the male mold side by a pair of pinch devices. After moving, the parison is shaped to follow the core of the male mold, that is, follow the angle in the depth direction of the hollow body to be molded, in order to enter the mold clamping process of the male and female molds. Thus, it is possible to suppress the local expansion of the parison and to mold a desired hollow molded article with less uneven thickness.
【００１５】[0015]
【実施の形態】以下、本発明の実施の形態について、図
を用いて説明する。Embodiments of the present invention will be described below with reference to the drawings.
【００１６】図１乃至図４は本発明の実施の形態である
ブロー成形方法に用いるブロー成形装置を工程順に示す
概要縦断面図である。1 to 4 are schematic longitudinal sectional views showing a blow molding apparatus used in a blow molding method according to an embodiment of the present invention in the order of steps.
【００１７】図において、所定深さのキャビティ３１を
有する雌金型３２と、キャビティ３１に収まるコア３３
を備えた雄金型３４を左右対向してセットし、雄金型３
４の上方にダイヘッド３５を配置する。又、雌雄両金型
３２、３４の上下部には、雌雄両金型３２、３４の間に
ダイヘッド３５から押出射出されたパリソン３６の上下
両端部を挟着するピンチ装置３７、３８を配設してい
る。In the figure, a female mold 32 having a cavity 31 of a predetermined depth and a core 33
A male mold 34 having
The die head 35 is disposed above the nozzle 4. In addition, pinch devices 37 and 38 are provided at the upper and lower portions of the male and female molds 32 and 34 for sandwiching the upper and lower ends of the parison 36 extruded from the die head 35 between the male and female molds 32 and 34. doing.
【００１８】パリソン３６は、たとえば、ＡＢＳ，変性
ＰＰＯ，ＰＰ，ＰＰ複合、ＨＤ・ＰＥ，ＬＤ・ＰＥ，Ａ
ＥＳ・ＰＥＴ等のブロー特性を有する樹脂材料を使用す
る。また、キャビティ３１の所定深さは、通常１５０ｍ
ｍ以上を有して、深絞りとなっており、又、中空成形品
１に対する屈曲部の角度は、通常９０〜３０度である。The parison 36 is made of, for example, ABS, modified PPO, PP, PP composite, HD / PE, LD / PE, A
A resin material having blow characteristics such as ES / PET is used. The predetermined depth of the cavity 31 is usually 150 m.
m and deep drawing, and the angle of the bent portion with respect to the hollow molded article 1 is usually 90 to 30 degrees.
【００１９】又、雌雄両金型３２、３４の型面側上下外
側角部は、パリソン３６の軸中心線Ｐに対して、θ＝２
５〜７５°の範囲で面取りされて、傾斜部３２ａ及び３
２ｂ、３４ａ及び３４ｂに形成されている。The upper and lower outer corners of the male and female molds 32 and 34 with respect to the axis center line P of the parison 36 are θ = 2.
It is chamfered in the range of 5 to 75 °, and the inclined portions 32a and 3
2b, 34a and 34b.
【００２０】ピンチ装置３７、３８は、図示しない装置
のベース等にブラケット３９を介して取付けられたエア
ーシリンダー等のそれぞれ一対のシリンダー４０及び４
１、４２及び４３と、このシリンダー４０及び４１、４
２及び４３によって左右方向すなわちパリソン３６の軸
中心線Ｐに交叉する方向に進退自在に移動可能なピンチ
バー４４及び４５、４６及び４７とを有して構成してい
る。ピンチバー４４及び４５、４６及び４７の先端に
は、それぞれ、パリソン３６を挟着する平板状のピンチ
部４４ａ及び４５ａ、４６ａ及び４７ａがそれぞれ取付
けてある。The pinch devices 37 and 38 are a pair of cylinders 40 and 4 such as an air cylinder mounted on a base or the like of a device (not shown) via a bracket 39.
1, 42 and 43 and the cylinders 40 and 41, 4
The pinch bars 44, 45, 46, and 47 are configured so as to be able to move forward and backward in the left and right direction, that is, in the direction crossing the axis P of the parison 36 by the two and 43. Flat pinch portions 44a and 45a, 46a and 47a for holding the parison 36 are attached to the tips of the pinch bars 44 and 45, 46 and 47, respectively.
【００２１】上記のように構成する本発明の実施の形態
によれば、先ず、図１に示すように、雌金型３２と雄金
型３４とが型開き状態にあるとき、ダイヘッド３５よ
り、雌金型３２と雄金型３４との間詳細にはピンチバー
４４及び４５、４６及び４７におけるピンチ部４４ａと
４５ａ及び４６ａと４７ａの間に、パリソン３６を押出
し射出する。この時、パリソン３６の下端部が、ピンチ
バー４６と４７との間を所定寸法だけ通り過ぎた時点
で、パリソン３６の射出完了とする。According to the embodiment of the present invention configured as described above, first, when the female mold 32 and the male mold 34 are in the mold open state as shown in FIG. The parison 36 is extruded and injected between the female mold 32 and the male mold 34, specifically, between the pinch portions 44a and 45a and 46a and 47a of the pinch bars 44 and 45, 46 and 47. At this time, the injection of the parison 36 is completed when the lower end of the parison 36 has passed between the pinch bars 46 and 47 by a predetermined size.
【００２２】次に、図２に示すように、シリンダー４０
及び４１、４２及び４３によって、ピンチバー４４及び
４５、４６及び４７をそれぞれパリソン３６の軸中心線
Ｐに向かって移動させ、このパリソン３６の軸中心線Ｐ
上において、ピンチ部４４ａと４５ａ及び４６ａと４７
ａとで、パリソン３６の上下両端部３６ａ，３６ｂをそ
れぞれ挟着して、狭着部４８、４９を形成する。Next, as shown in FIG.
And the pinch bars 44, 45, 46 and 47 are respectively moved toward the axial center line P of the parison 36, and the axial center line P
Above, pinch portions 44a and 45a and 46a and 47
The upper and lower ends 36a and 36b of the parison 36 are sandwiched between the upper and lower parts of the parison 36 to form narrow attachment parts 48 and 49, respectively.
【００２３】次に、図３に示すように、シリンダー４０
及び４１、４２及び４３を再び作動させて、ピンチ部４
４ａと４５ａ，４６ａと４７ａによるパリソン３６の挟
着部４８、４９をパリソン３６の軸中心線Ｐ上から雄金
型３４側に横動させて、パリソンは雄金型のコア部にほ
ぼ沿った形すなわち成形すべき中空成形体１の深さ方向
の角度に追従した形に形作られている。この時、雄金型
３４の傾斜部３４ａ，３４ｂは、パリソン３６の両端部
の移動を可能にする逃げとして働く。そして、傾斜部３
４ａ，３４ｂの傾斜角が２５°以下では、パリソン２６
の上下両端部の移動ができず、又、７５°以上では、パ
リソン３６が雄金型３４に先当りして伸び切り、後述の
エアーブローができなくなってしまうことから、傾斜部
３４ａ，３４ｂの傾斜角を２５〜７５°としている。Next, as shown in FIG.
And 41, 42, and 43 are operated again, and the pinch portion 4
The sandwiching portions 48 and 49 of the parison 36 by 4a and 45a, 46a and 47a are moved laterally from the axial center line P of the parison 36 toward the male mold 34, and the parison almost follows the core of the male mold. It is formed in a shape that follows the angle in the depth direction of the hollow molded body 1 to be molded. At this time, the inclined portions 34a and 34b of the male mold 34 function as escapes that enable movement of both ends of the parison 36. And the inclined part 3
When the inclination angle of 4a, 34b is 25 ° or less, parison 26
The upper and lower ends cannot move, and if the angle is 75 ° or more, the parison 36 comes into contact with the male mold 34 and stretches out, so that air blow described later cannot be performed. The inclination angle is 25 to 75 °.
【００２４】上記したパリソン３６の上下両端部の挟着
部４８を雄金型３４側に移動した後、雌雄両金型３２、
３４の型締めを開始し、図４に示す型締め終了位置まで
型締めをおこなって、パリソン３６の一側３６ａがコア
３３の前面部全体にほぼ接触すると共に、パリソン３６
の他側がキャビティ３１の型面全体にほぼ接触してい
る。この時、雌雄両金型３２、３４が当接して形成する
パーティング部５２によって更にパリソン３６が挟着さ
れ、又、パリソン３６の上下両端部が雌雄両金型３２、
３４に形成した突部５０、５１よって強く押圧して、押
圧力を与えると共に、図示しないエアブロー装置のブロ
ーピンによりパリソン３６に穴を明けてパリソン３６内
をエアブローしてパリソン３６を膨張させて、キャビテ
ィ３１とコア３３が形成する成形型と同一形状の中空成
形品１の成形を完了する。After moving the holding portions 48 at the upper and lower ends of the parison 36 toward the male mold 34, the male and female molds 32,
The mold clamping is started to the mold clamping end position shown in FIG. 4, and the one side 36 a of the parison 36 almost contacts the entire front surface of the core 33, and the parison 36
Is almost in contact with the entire mold surface of the cavity 31. At this time, the parison 36 is further sandwiched by the parting portion 52 formed by the contact of the male and female molds 32 and 34, and both upper and lower ends of the parison 36 are formed by the male and female molds 32 and 34.
The projections 50 and 51 formed on the projection 34 press strongly to apply a pressing force. Also, a hole is formed in the parison 36 by a blow pin of an air blow device (not shown), and the parison 36 is inflated by air blowing inside the parison 36 to form a cavity. The molding of the hollow molded article 1 having the same shape as the molding die formed by the core 31 and the core 33 is completed.
【００２５】なお、雌雄両金型３２、３４の型締め完了
後、パリソン３６の上下両端部の挟着点４８をパリソン
３６の軸中心線Ｐ上に戻すべくピンチ装置を横動させて
おけば、次の成形工程の準備が整うことになる。After the clamping of the male and female dies 32, 34 is completed, the pinch device is moved laterally so that the clamping points 48 at the upper and lower ends of the parison 36 are returned to the axial center line P of the parison 36. Thus, the preparation for the next molding step is ready.
【００２６】以上のように構成する本発明による実施の
形態によるブロー成形方法では、パリソン３６の上下両
端部における挟着部４８をパリソン３６の軸中心線Ｐよ
り雄金型３４側に移動させた後に、雌雄両金型３２、３
４の型締めを行っている結果、パリソン３６の雌雄両金
型３３、３４に接した部分の伸展性に余裕ができて、パ
リソン３６がキャビティー３１及びコア３３の型面に接
触する部分を多くすることができ、中空成形品１の屈曲
部２が薄肉となるのを防止できる。In the blow molding method according to the embodiment of the present invention configured as described above, the holding portions 48 at the upper and lower ends of the parison 36 are moved toward the male mold 34 from the axial center line P of the parison 36. Later, both male and female molds 32, 3
As a result of the mold clamping of No. 4, the extensibility of the portion of the parison 36 in contact with the male and female molds 33 and 34 has a margin, and the portion where the parison 36 contacts the mold surface of the cavity 31 and the core 33 is removed. It is possible to prevent the bent portion 2 of the hollow molded product 1 from becoming thin.
【００２７】[0027]
【発明の効果】以上のように、本発明のブロー成形方法
によれば、パリソンの上下両端部における挟着部をパリ
ソンの軸中心線より雄金型側に移動させた後に、雌雄両
金型の型締めを行っている結果、パリソンの雌雄両金型
に接した部分の伸展性に余裕ができて、パリソンがキャ
ビティー及びコアの型面に接触する部分を多くすること
ができ、中空成形品の屈曲部が薄肉となるのを防止でき
るAs described above, according to the blow molding method of the present invention, both the male and female molds are moved after the holding portions at the upper and lower ends of the parison are moved toward the male mold from the center line of the parison. As a result of the mold clamping of the parison, the extensibility of the part in contact with the male and female molds of the parison can be afforded, the part where the parison contacts the mold surface of the cavity and the core can be increased, and the hollow molding The bent part of the product can be prevented from becoming thin
【図１】本発明の実施の形態であるブロー成形装置にお
ける型開き時を示す概略縦断面図である。FIG. 1 is a schematic longitudinal sectional view showing a state in which a mold is opened in a blow molding apparatus according to an embodiment of the present invention.
【図２】同じく、ピンチ装置がパリソンの上下両端部を
挟着した状態を示す概略断面図である。FIG. 2 is a schematic cross-sectional view showing a state in which the pinch device sandwiches both upper and lower ends of a parison.
【図３】同じく、ピンチ装置によるパリソンの上下両端
部の挟着部を雄金型側へ横動させた状態を示す概略縦断
面図である。FIG. 3 is a schematic vertical sectional view showing a state in which the pinch portions at the upper and lower ends of the parison are laterally moved to the male mold side by the pinch device.
【図４】同じく、雌雄両金型の型締め完了時状態を示す
概略縦断面図である。FIG. 4 is a schematic longitudinal sectional view showing a state at the time of completion of mold clamping of both male and female dies.
【図５】ブロー成形装置により成形される中空成形品で
ある自動車用バンパーの斜視図である。FIG. 5 is a perspective view of an automobile bumper which is a hollow molded product formed by a blow molding device.
【図６】従来のブロー成形装置の一例における型開き状
態を示す概略縦断面図である。FIG. 6 is a schematic vertical sectional view showing a mold opening state in an example of a conventional blow molding apparatus.
【図７】同じく、型締め終了時を示す概略縦断面図であ
る。FIG. 7 is a schematic longitudinal sectional view showing a state at the end of mold clamping.
【図８】従来のブロー成形装置の他の例における型締め
終了時を示す概略縦断面図である。FIG. 8 is a schematic vertical cross-sectional view showing another example of the conventional blow molding apparatus at the end of mold clamping.
【図９】従来のブロー成形装置の更に他の例における型
締め終了時を示す概略縦断面図である。FIG. 9 is a schematic longitudinal sectional view showing a state at the end of mold clamping in still another example of the conventional blow molding apparatus.
１ 中空成形品 ２ 屈曲部 ３１ キャビティ ３２ 雌金型 ３３ コア ３４ 雄金型 ３５ ダイヘッド ３６ パリソン ３６ａ 一側 ３６ｂ 他側 ３７、３８ ピンチ装置 ４４〜４７ ピンチバー ４４ａ，４５ａ，４６ａ，４７ａ ピンチ部 ４８ 挟着部 ５２ パーティング部 Ｐ パリソン３６の軸中心線 Reference Signs List 1 hollow molded product 2 bent portion 31 cavity 32 female mold 33 core 34 male mold 35 die head 36 parison 36a one side 36b other side 37, 38 pinch device 44-47 pinch bar 44a, 45a, 46a, 47a pinch portion 48 pinching Part 52 Parting part P Axis line of parison 36
Claims (1)
この雌金型に収まるコアを備えた雄金型との間に上方の
ダイヘッドからパリソンを押出射出させて、該パリソン
の上下両端部を、一対のピンチ装置のピンチバーによっ
てそれぞれ前記パリソンの軸中心線上において挟着し、
その後、前記ピンチ装置によって前記パリソンのピンチ
バーによる挟着部を前記パリソンの軸中心線上から前記
雄金型側に横動させてから前記雌雄両金型の型締めを行
って、この型締めが完了した時に前記パリソン内をエア
ブローして、前記パリソンを所望の中空成形品に成形す
るようにしたことを特徴とするブロー成形方法。1. A parison is extruded from an upper die head between a female mold having a cavity of a required depth and a male mold having a core that fits in the female mold, and upper and lower ends of the parison are extruded. Are pinched on the axis center line of the parison by pinch bars of a pair of pinch devices, respectively.
Thereafter, the pinch device causes the pinch bar of the parison to move laterally from the center line of the parison to the male mold side, and then performs the mold clamping of the male and female molds, thereby completing the mold clamping. Blow molding the parison into a desired hollow molded product by air blowing inside the parison.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10398898A JP3629946B2 (en) | 1998-03-31 | 1998-03-31 | Blow molding method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10398898A JP3629946B2 (en) | 1998-03-31 | 1998-03-31 | Blow molding method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH11277612A true JPH11277612A (en) | 1999-10-12 |
| JP3629946B2 JP3629946B2 (en) | 2005-03-16 |
Family
ID=14368695
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10398898A Expired - Fee Related JP3629946B2 (en) | 1998-03-31 | 1998-03-31 | Blow molding method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3629946B2 (en) |
-
1998
- 1998-03-31 JP JP10398898A patent/JP3629946B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JP3629946B2 (en) | 2005-03-16 |
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