JPH07125058A - Hole forming method of blow molded product - Google Patents

Hole forming method of blow molded product

Info

Publication number
JPH07125058A
JPH07125058A JP29911993A JP29911993A JPH07125058A JP H07125058 A JPH07125058 A JP H07125058A JP 29911993 A JP29911993 A JP 29911993A JP 29911993 A JP29911993 A JP 29911993A JP H07125058 A JPH07125058 A JP H07125058A
Authority
JP
Japan
Prior art keywords
hole
molding material
molding
cavity
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.)
Pending
Application number
JP29911993A
Other languages
Japanese (ja)
Inventor
Hisashi Aizawa
恒 相澤
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Dai Nippon Printing Co Ltd
Original Assignee
Dai Nippon Printing Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Dai Nippon Printing Co Ltd filed Critical Dai Nippon Printing Co Ltd
Priority to JP29911993A priority Critical patent/JPH07125058A/en
Publication of JPH07125058A publication Critical patent/JPH07125058A/en
Pending legal-status Critical Current

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
    • B29C2793/00—Shaping techniques involving a cutting or machining operation
    • B29C2793/0009—Cutting out
    • B29C2793/0018—Cutting out for making a hole
    • 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
    • B29C2793/00—Shaping techniques involving a cutting or machining operation
    • B29C2793/009—Shaping techniques involving a cutting or machining operation after shaping
    • 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
    • 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
    • B29C49/50—Moulds having cutting or deflashing means

Landscapes

  • Moulds For Moulding Plastics Or The Like (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)

Abstract

PURPOSE:To reduce a perforation process after molding and to prevent cut refuse from remaining by thrusting out a drill member into a cavity in good timing when air is blown in a-molding material to drill a hole in the expanded molding material. CONSTITUTION:A tubular parison is extruded from a die 2 to be held between molds 1 and air is blown in the parison from a air blow-in port 8 to expand the parison along the inner walls of the molds. At the same time, a drill member 5 is thrust out to the interior of a cavity 7 in good timing by a cylinder 7 to drill a hole in an expanded molding material 9 on the way of molding. After cooling. the molding material 9 is taken out.

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【産業上の利用分野】本発明は、中空成形品の側面や底
面に孔を形成する方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for forming a hole on the side surface or bottom surface of a hollow molded article.

【０００２】[0002]

【従来の技術】従来、中空成形品に空気抜き等の目的で
孔を形成する場合、成形した後でドリルにて孔を開ける
方法、或いは、孔を開けたいところを予め凸に出っ張ら
せて成形しこの部分をカッター等で切り取る方法が採ら
れている。2. Description of the Related Art Conventionally, when a hole is formed in a hollow molded article for the purpose of removing air, etc., a method of forming a hole with a drill after molding or forming a hole in a convex shape is desired. A method of cutting out this portion with a cutter or the like is adopted.

【０００３】[0003]

【発明が解決しようとする課題】従来の技術で述べた前
者の方法では、孔の周りにケバが立つとともに切り子が
製品の中に残るので、後加工を必要とするという問題点
がある。また、後者の方法では、カッターによる切断を
主に手加工で行うので、孔径及びカット部形状にバラツ
キが発生し、しかも切りカスが製品の中に入るという問
題点がある。In the former method described in the prior art, there is a problem that post-processing is required because a fluff stands around the hole and the facet remains in the product. Further, in the latter method, since the cutting with a cutter is mainly performed by hand, there is a problem that the hole diameter and the shape of the cut portion are varied, and moreover the cut dust enters the product.

【０００４】本発明は、上記のような問題点に鑑みなさ
れたものであり、その目的とするところは、加工工程の
削減及び品質の向上を図ることのできる中空成形品の孔
形成方法を提供することにある。The present invention has been made in view of the above problems, and an object of the present invention is to provide a method for forming holes in a hollow molded product which can reduce the number of processing steps and improve the quality. To do.

【０００５】[0005]

【課題を解決するための手段】上記目的を達成するため
に、本発明の中空成形品の孔形成方法は、中空成形用金
型に先端の鋭いキリ部材をキャビティへ向けて突出しが
可能なように配設しておき、空気の吹込み時にタイミン
グを合わせてキリ部材をキャビティ内に突き出すことに
より、膨張した成形材料に孔を形成するようにしたもの
である。In order to achieve the above object, the method for forming a hole in a hollow molding product according to the present invention is designed so that a hollow member having a sharp tip can be projected toward a cavity in a hollow molding die. The hole is formed in the expanded molding material by projecting the drilling member into the cavity at the same timing when the air is blown.

【０００６】[0006]

【作用】上述の構成からなる本発明の中空成形品の孔形
成方法では、成形材料が金型内で中空状に成形されると
同時に当該成形材料に対して孔が開けられる。According to the method of forming a hole for a hollow molded article of the present invention having the above-described structure, the molding material is formed into a hollow shape in the mold and at the same time a hole is opened in the molding material.

【０００７】[0007]

【実施例】以下、図面を参照して本発明の実施例を説明
する。Embodiments of the present invention will be described below with reference to the drawings.

【０００８】図１は本発明を実施する中空成形機の一例
を示す概略図で、同図において１は二つ割りにした凹形
状の金型、２はパリソン３を押し出すためのダイであ
り、金型１には冷却水路４が設けられ、さらに先端の鋭
いキリ部材５とこれをキャビティ６に向けて突き出すよ
うに作動するシリンダー７が設けられている。FIG. 1 is a schematic view showing an example of a blow molding machine for carrying out the present invention. In FIG. 1, 1 is a concave mold having two halves, and 2 is a die for pushing out a parison 3, 1, a cooling water passage 4 is provided, and a sharp drilling member 5 having a sharp tip and a cylinder 7 that operates so as to project the drilling member 5 toward a cavity 6 are provided.

【０００９】この中空成形機においては、押出機のホッ
パーに入れられた成形材料が押出機内で加熱溶融され、
その先端に取り付けられたダイ２によって図１に示す如
くチューブ状のパリソン３が押し出される。次いで、こ
のパリソン３を金型１で挟んだ状態とし、空気吹込口８
からパリソン３内に空気を吹き込み、図２に示すよう
に、金型１の内壁に沿って膨らませ、これと同時にタイ
ミングを合わせてキリ部材５をキャビティ６内に突き出
すことにより、膨張した成形途中の成形材料９に孔を開
ける。そして、冷却後にこの成形材料９を取り出すと、
孔の開いた中空製品が得られる。In this hollow molding machine, the molding material placed in the hopper of the extruder is heated and melted in the extruder,
As shown in FIG. 1, the tubular parison 3 is extruded by the die 2 attached to the tip thereof. Next, the parison 3 is sandwiched between the molds 1 and the air inlet 8
2, air is blown into the parison 3 to inflate it along the inner wall of the mold 1, and at the same time, the drill member 5 is projected into the cavity 6 at the same time, so that the expanded midway The molding material 9 is perforated. When the molding material 9 is taken out after cooling,
A hollow product with holes is obtained.

【００１０】[0010]

【発明の効果】以上説明したように、本発明の中空成形
品の孔形成方法によれば、金型での成形と同時に成形材
料に対して孔が開けられるので、従来は成形後に行って
いた孔開けの工程が削減でき、しかも切りクズが残らな
い品質の良いものを作成することができる。As described above, according to the method for forming a hole in a hollow molded article of the present invention, a hole can be formed in a molding material at the same time as molding with a mold. It is possible to reduce the number of drilling steps, and it is possible to produce high-quality products that do not leave cutting scraps.

【図面の簡単な説明】[Brief description of drawings]

【図１】本発明を実施する中空成形機を示す断面図であ
る。FIG. 1 is a cross-sectional view showing a blow molding machine for carrying out the present invention.

【図２】成形時の様子を示す断面図である。FIG. 2 is a cross-sectional view showing a state during molding.

【符号の説明】[Explanation of symbols]

１ 金型 ２ ダイ ３ パリソン ４ 冷却水路 ５ キリ部材 ６ キャビティ ７ シリンダー ８ 空気吹き込み口 ９ 成形材料 1 Mold 2 Die 3 Parison 4 Cooling Channel 5 Drilling Member 6 Cavity 7 Cylinder 8 Air Inlet 9 Molding Material

Claims (1)

【特許請求の範囲】[Claims] 【請求項１】 中空成形用金型に先端の鋭いキリ部材を
キャビティへ向けて突出しが可能なように配設してお
き、空気の吹込み時にタイミングを合わせてキリ部材を
キャビティ内に突き出すことにより、膨張した成形材料
に孔を形成することを特徴とする中空成形品の孔形成方
法。1. A hollow molding die is provided with a sharp drilling member having a sharp tip toward the cavity, and the drilling member is projected into the cavity at the same timing when air is blown. The method for forming a hole in a hollow molded article is characterized in that a hole is formed in the expanded molding material.
JP29911993A 1993-11-05 1993-11-05 Hole forming method of blow molded product Pending JPH07125058A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP29911993A JPH07125058A (en) 1993-11-05 1993-11-05 Hole forming method of blow molded product

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP29911993A JPH07125058A (en) 1993-11-05 1993-11-05 Hole forming method of blow molded product

Publications (1)

Publication Number Publication Date
JPH07125058A true JPH07125058A (en) 1995-05-16

Family

ID=17868371

Family Applications (1)

Application Number Title Priority Date Filing Date
JP29911993A Pending JPH07125058A (en) 1993-11-05 1993-11-05 Hole forming method of blow molded product

Country Status (1)

Country Link
JP (1) JPH07125058A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112372992A (en) * 2020-11-30 2021-02-19 重庆益弘工程塑料制品有限公司 Cavity blowing plastics oil tank in-mould processingequipment
CN112743624A (en) * 2020-12-14 2021-05-04 亚普汽车部件股份有限公司 Auxiliary mechanism and method for forming hollow body edge clamping hole
CN116100791A (en) * 2023-02-23 2023-05-12 飞尔德航空器材制造(上海)有限公司 Hot press device of aviation transparent piece with bolt mounting structure

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112372992A (en) * 2020-11-30 2021-02-19 重庆益弘工程塑料制品有限公司 Cavity blowing plastics oil tank in-mould processingequipment
CN112372992B (en) * 2020-11-30 2022-05-03 重庆益弘防务科技有限公司 Cavity blowing plastics oil tank in-mould processingequipment
CN112743624A (en) * 2020-12-14 2021-05-04 亚普汽车部件股份有限公司 Auxiliary mechanism and method for forming hollow body edge clamping hole
CN112743624B (en) * 2020-12-14 2022-05-20 亚普汽车部件股份有限公司 Auxiliary mechanism and method for forming hollow body edge clamping hole
CN116100791A (en) * 2023-02-23 2023-05-12 飞尔德航空器材制造(上海)有限公司 Hot press device of aviation transparent piece with bolt mounting structure

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