JPS59136229A - Die for injection molding - Google Patents

Die for injection molding

Info

Publication number
JPS59136229A
JPS59136229A JP1207083A JP1207083A JPS59136229A JP S59136229 A JPS59136229 A JP S59136229A JP 1207083 A JP1207083 A JP 1207083A JP 1207083 A JP1207083 A JP 1207083A JP S59136229 A JPS59136229 A JP S59136229A
Authority
JP
Japan
Prior art keywords
boss
pin
hole
larger
compressed air
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
JP1207083A
Other languages
Japanese (ja)
Inventor
Masamitsu Miyazaki
政光 宮崎
Katsue Kenmochi
剣持　加津衛
Yorihisa Maeda
前田　順久
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial 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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP1207083A priority Critical patent/JPS59136229A/en
Publication of JPS59136229A publication Critical patent/JPS59136229A/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
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/72—Heating or cooling
    • B29C45/73—Heating or cooling of the mould
    • B29C45/7337—Heating or cooling of the mould using gas or steam
    • 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
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/1703—Introducing an auxiliary fluid into the mould
    • 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
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/40—Removing or ejecting moulded articles
    • B29C45/4005—Ejector constructions; Ejector operating mechanisms
    • B29C45/401—Ejector pin constructions or mountings
    • B29C2045/4026—Ejectors with internal cooling
    • 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
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/40—Removing or ejecting moulded articles
    • B29C45/4005—Ejector constructions; Ejector operating mechanisms
    • B29C45/401—Ejector pin constructions or mountings

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)

Abstract

PURPOSE:To provide a die for injection molding capable of manufacturing a resin molded product which has no sinkmark at a boss part and is improved in quality level, by arranging the die such that compressed air is supplied when a molded product is being released in order to cool a boss hole pin, thereby preventing accumulation of heat and increasing the cooling efficiency. CONSTITUTION:A boss pin 8 is composed of a hollow cylindrical boss body pin 12 and a boss hole pin 11 slidably received in the pin 12. The lower end of the boss body pin 12 is formed with a larger diameter and is fixedly fitted into a stepped hole in an extruding plate 7. The boss hole pin 11 has a larger-diameter part 11b which is received in a larger-diameter hole 12b formed at the lower end part of the boss body pin 12 with a gap extending in both radial and axial directions. The larger-diameter part 11b defines a gap of about several millimeters between the same and the larger-diameter hole 12b at the lower end of the boss body pin 12. A compressed air inlet 14 having a compressed air passage 13, extending to a taper hole 12 at the upper end opening, formed by the gap between the pins 12 and 11 extends from a side surface of the extruding plate 7 to the larger-diameter hole 12b.

Description

【発明の詳細な説明】 産業上の利用分野 本発明は熱可塑性樹脂の射出成形用金型に関するＯ 従来例の構成とその問題点 従来、第１図に示す様なボス部（Ｂ）を有する成形品（
蜀を成形する射出成形用金型（以下金型という）は第２
図の様な構成のものであった。（１）は固定型板、■は
可動型板で、これらの間に成形品（Ａ）に対応したキャ
ビティ翰が形成されている。固定型板（１）は固定側取
付板（３１に固定され、可動型板（２は受は板（４）、
スペーサブロック■を介して可動側・取付板β）に固定
されている。■は受は板（４）と可動側取付板（６）間
の空間に移動可能に配置された押出板であり、この押出
板■から、前記ボス部（均に対応するキャビティの突出
部分（ａ）Ｌ）を形成するボスピン兼押出しピン（８１
が受は板（ｌ＃）及び可動型板Ｑ）を貫通する様に突設
されている。（９）はロケートリング、αＯはスプール
ブツシュである。この様な金型で、成形品（Ａ）を成形
すると、ボス部（Ｂ）は熱収縮が遅いため、周辺の薄肉
部における熱収縮の速い方へ樹脂が引かれ、ヒケ（Ｃ）
を生じるという様な問題があった。この様なボス部（Ｂ
）に藝げるヒケ（Ｃ）を無くす対策としては一般にはボ
ス部（Ｂ）の根元の太肉部の肉厚（１）を厚くしてボス
部（Ｂ）の直径に近づけ、かつ成形圧力を高（すればよ
いといわれている。しかし、その結果は必ずしもヒケは
直らず、その上樹脂の使用量が増し、て不経済である。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a mold for injection molding of thermoplastic resin.Conventional structure and problems thereof Conventionally, the present invention has a boss portion (B) as shown in FIG. Molding(
The injection mold for molding Shu (hereinafter referred to as the mold) is the second one.
The structure was as shown in the figure. (1) is a fixed mold plate, and 2 is a movable mold plate, between which a cavity wall corresponding to the molded product (A) is formed. The fixed mold plate (1) is fixed to the fixed side mounting plate (31), the movable mold plate (2 is the plate (4),
It is fixed to the movable side/mounting plate β) via the spacer block ■. The receiver (■) is an extrusion plate that is movably arranged in the space between the plate (4) and the movable mounting plate (6). a) Boss pin/extrusion pin (81) forming L)
However, the receiver is provided so as to protrude through the plate (l#) and the movable mold plate Q). (9) is a locate ring, and αO is a spool bush. When molding a molded product (A) with such a mold, the boss part (B) has a slow heat shrinkage, so the resin is drawn toward the thin walled part around it that has a fast heat shrinkage, resulting in sink marks (C).
There was a problem where this occurred. Boss part like this (B
) As a countermeasure to eliminate sink marks (C), the thick part at the base of the boss (B) is generally increased in thickness (1) to approximate the diameter of the boss (B), and the molding pressure is increased. It is said that it is possible to increase the amount of resin used.However, the result is that the sink marks are not necessarily cured, and in addition, the amount of resin used increases, which is uneconomical.

また成形圧力を高くすれば、金型の消耗が早く、その上
製品にパリを多く発生するという問題を生じることにな
る０ 発明の目的 本発明は、上記問題点に鑑み、ボス部にヒケのない良好
な、品質レベルを向上させた樹脂成形品を得ることがで
きる射出成形用金型を提供することを目的とする。In addition, if the molding pressure is increased, the mold will wear out quickly, and moreover, there will be a problem in that the product will have many cracks.Objective of the Invention In view of the above problems, the present invention has been developed to prevent sink marks on the boss portion. It is an object of the present invention to provide an injection mold that can produce resin molded products with improved quality.

発明の構成 本発明はこのため、成形品のボス部を形成するボスピン
を、筒状のボス本体部ピンとこのボス本体部ピンに摺動
可能に嵌入したボス穴部ピンとから構成し、ボス本体部
ピンの下端を押出板に固定すると共に、押出板からボス
本体部ピンとボス穴部ピンの間隙を通ってボス本体部ピ
ン上端開口に達する圧縮空気通路を設け、成形品離型中
に圧縮空気を送り込んでボス穴部ピンを冷却し、その蓄
熱を無くシ、冷却効率を高めてボス部のヒケを小さくで
きる様にした射出成形用金型を提供する。Structure of the Invention For this reason, the present invention includes a boss pin that forms the boss of a molded product, consisting of a cylindrical boss body pin and a boss hole pin that is slidably fitted into the boss body pin. The lower end of the pin is fixed to the extrusion plate, and a compressed air passage is provided from the extrusion plate to the upper end opening of the boss body pin through the gap between the boss body pin and the boss hole pin, so that the compressed air can be supplied during mold release. To provide an injection mold in which a boss hole pin is fed and cooled, heat storage thereof is eliminated, cooling efficiency is increased, and sink marks in the boss part can be reduced.

実施例の説明 以下、本発明の一実施例を第３図及び第４図に基づいて
説明する。なお、第１図及び第２図で説け、中空筒状の
ボス本体部ピン叫と、このボス本体部ビン叫に嵌入した
ボス穴部ピンαりとから構成されている。ボス本体部ピ
ン＋１２１の下端部は大径に形成され、押出板ｔ５）の
段付穴に嵌合固定されている。ボス穴部ピンの）の下端
には、ボス本体部ピンＵの下端大径部に形成した大径穴
（１２１））に径方向及び軸方向に隙間をあけて嵌入す
る大径部（１１１））が形成され、上端部には上方に移
行するに伴なってボス本体部ピン（１２＋と同径になる
まで漸次径が増大するテーパ部（１１０）’ｅ介してボ
ス穴に嵌入する嵌入ピン部（ｌｌａ）が設けられている
゛。前記テーパ部（１１０）はボス本体部ピン（功の上
端開口に形成したテーパ穴（ｔ２ａｙ丁度嵌合する。ま
た、ボス穴部ピンａ℃下端の大径部（１１１））とボス
本体部ピン（１２１下端の大径穴（１２））との間の軸
方向の隙間は数ミ’）程度膜けられ、この範囲でボス穴
部ピンα℃はボス本体部ピン叫内で上方に摺動可能であ
る。そして、ボス本体部ピン（１２１とボス穴部ビン但
との間の間隙によりボス本体部ピン（１２１下端の大径
穴（１２１））から上端のテーノく穴（１２ａ＊至る圧
縮空気通路αＢ）が形成されている。０句は押出板（７
）の側面から前記ボス本体部ピンａ２１の大径穴（１２
ｂ）　Ｋ　ｉｊ通させて形成した圧縮空気供給口である
。μｓ）はボス穴部ピン（１１）の大径部（１１１））
上面に形成した圧縮空気通路の連通溝である。DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 3 and 4. As shown in FIGS. 1 and 2, it is composed of a hollow cylindrical boss main body pin and a boss hole pin inserted into the boss main body pin. The lower end of the boss body pin +121 is formed to have a large diameter, and is fitted and fixed into a stepped hole of the extrusion plate t5). The lower end of the boss hole pin U has a large diameter portion (111) that fits into the large diameter hole (121) formed in the large diameter portion of the lower end of the boss body pin U with a gap in the radial and axial directions. ) is formed at the upper end, and a fitting pin that fits into the boss hole through a tapered part (110)'e whose diameter gradually increases as it moves upward until it becomes the same diameter as the boss main body pin (12+). The taper part (110) fits exactly into the taper hole (t2ay) formed at the upper end opening of the boss body pin (110). The axial clearance between the diameter part (111) and the boss body pin (the large diameter hole (12) at the lower end of 121) is approximately several millimeters, and within this range the boss hole pin α℃ is The boss body pin can be slid upward within the boss body pin (121) and the large diameter hole (121) at the lower end of the boss body pin (121) due to the gap between the boss body pin (121) and the boss hole pin. A compressed air passage αB leading to 12a* is formed at the upper end.
) from the side of the boss main body pin a21 (12
b) A compressed air supply port formed by passing through the Kij. μs) is the large diameter part (111) of the boss hole pin (11))
This is a communication groove for a compressed air passage formed on the top surface.

以上の構成において、成形後押出しロッドにより押出板
■が押し上げられると、ボスピン■７５（上方に摺動し
、成形品体）が可動型板（２）のキャビティ（２０）か
ら突き出される。この突出し動作を行なわせる信号によ
って図外圧縮空気源の電磁ノくルブも開かれ、圧縮空気
供給口←揚から圧縮空気が圧縮空気通路αＢ）に送り込
まれる。すると、ボス穴部ピンａ：１）がボス本体部ピ
ン史内で上方に押し上げられて摺動し、ボス本体部ビン
圏の上端開口のテーノく穴（１＞）トボス穴部ピン（９
）のテーパ部（ｌｉｅ）との間が開口し、圧縮空気が噴
出してボス穴部ピン（２）の上端部が冷却される。その
後型締め動作を行なわせる信号によ１て前記電磁パルプ
は閉じ、押出板■が元位置に復帰し、成形が行なわれる
。突出した状態のボス穴部ピン■は射出成形時に樹脂圧
力により元位置に復帰する。In the above configuration, when the extrusion plate (2) is pushed up by the extrusion rod after molding, the boss pin (75) (sliding upward and forming the molded product body) is extruded from the cavity (20) of the movable mold plate (2). The signal for performing this ejecting operation also opens the electromagnetic knob of the compressed air source (not shown), and compressed air is sent into the compressed air passage αB) from the compressed air supply port ←. Then, the boss hole pin a: 1) is pushed upward and slid in the boss body pin history, and the boss hole pin (9
) is opened, compressed air is blown out, and the upper end of the boss hole pin (2) is cooled. Thereafter, the electromagnetic pulp is closed by a signal 1 for performing a mold clamping operation, the extrusion plate 2 is returned to its original position, and molding is performed. The protruding boss hole pin (■) returns to its original position due to resin pressure during injection molding.

発明の効果 本発明の射出成形用金型によれば、以上の説明から明ら
かな様に、金型の離型中にボス穴部ピンの上端部を圧縮
空気で冷却できるため蓄熱が少なく、冷却効率が高くな
り、ヒケ童を小さくできて品質を向上させることができ
る。また、樹脂圧力によりボス穴部ピンが元の位置に戻
るため、ボスの高さにばらつきを生ずることもなく、安
定した成形品を提供できる。従って成形、サイクルを短
縮しても品質が低下しないため、生産効率も向上できる
。Effects of the Invention According to the injection molding mold of the present invention, as is clear from the above explanation, the upper end of the boss hole pin can be cooled with compressed air during mold release, so there is little heat accumulation and cooling Efficiency is increased, shrinkage can be reduced, and quality can be improved. Furthermore, since the boss hole pin returns to its original position due to resin pressure, a stable molded product can be provided without causing variations in the height of the boss. Therefore, even if the molding cycle is shortened, the quality does not deteriorate, and production efficiency can also be improved.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は成形品の一例を示す断面図、第２図は従来例の
縦断面図、第３図及び第４図は本発明の一実施例を示し
、第３図は全体縦断面図、第４図は型を開いた状態の要
部拡大断面図である。 （１）は固定型板、■は可動型板、Ｃ′Ｉ）は押出板、
（８＞にボスビン兼押出しピン、　Ｑｌｌはボス穴部ピ
ン、（１１ａ）は嵌入ピン部、（１１１））　Ｕ　大径
部、（ｌｌｃ）　ｕ　ｆ　−ハ部、囮）はボス本体部ピ
ン、（１２ａ）はテーパ穴、（１２１））は大径穴、ａ
３）は圧縮空気通路、０４は圧縮空気供給口、（２０）
はキャビティ。 第７図 第２図 第３図FIG. 1 is a sectional view showing an example of a molded product, FIG. 2 is a longitudinal sectional view of a conventional example, FIGS. 3 and 4 show an embodiment of the present invention, and FIG. 3 is an overall longitudinal sectional view. FIG. 4 is an enlarged cross-sectional view of the main parts of the mold in an open state. (1) is a fixed mold plate, ■ is a movable mold plate, C'I) is an extrusion plate,
(8> is the boss bottle/extrusion pin, Qll is the boss hole pin, (11a) is the insertion pin, (111)) U large diameter part, (llc) u f - C part, decoy) is the boss main body pin, (12a) is a tapered hole, (121)) is a large diameter hole, a
3) is a compressed air passage, 04 is a compressed air supply port, (20)
is the cavity. Figure 7 Figure 2 Figure 3

Claims (1)

【特許請求の範囲】[Claims] 成形品のボス部を形成するボスピンを、筒状のボス本体
部ピンとこのボス本体部ピンに摺動可能に嵌入り、タボ
ス穴部ビンとから構成し、ボス本体部ピンの下端を押出
板に固定すると共に、押出板からボス本体部ピンとボス
穴部ピンの間隙を通ってボス本体部ピン上端開口に達す
る圧縮空気通路を設けた射出成形用金型。The boss pin that forms the boss of the molded product is composed of a cylindrical boss body pin that is slidably fitted into the boss body pin, and a tab boss hole pin, and the lower end of the boss body pin is attached to the extrusion plate. An injection mold is provided with a compressed air passage from an extrusion plate, passing through a gap between a boss body pin and a boss hole pin, and reaching an upper end opening of the boss body pin.
JP1207083A 1983-01-26 1983-01-26 Die for injection molding Pending JPS59136229A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1207083A JPS59136229A (en) 1983-01-26 1983-01-26 Die for injection molding

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1207083A JPS59136229A (en) 1983-01-26 1983-01-26 Die for injection molding

Publications (1)

Publication Number Publication Date
JPS59136229A true JPS59136229A (en) 1984-08-04

Family

ID=11795338

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1207083A Pending JPS59136229A (en) 1983-01-26 1983-01-26 Die for injection molding

Country Status (1)

Country Link
JP (1) JPS59136229A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1661684A2 (en) * 2004-11-26 2006-05-31 Hitachi Industrial Equipment Systems Co. Ltd. Ejector with internal fluid path and moulding method
CN105479691A (en) * 2015-12-31 2016-04-13 江苏大通汽车模具零部件有限公司 Combined ejector rod

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1661684A2 (en) * 2004-11-26 2006-05-31 Hitachi Industrial Equipment Systems Co. Ltd. Ejector with internal fluid path and moulding method
EP1661684A3 (en) * 2004-11-26 2006-09-06 Hitachi Industrial Equipment Systems Co. Ltd. Ejector with internal fluid path and moulding method
US7591643B2 (en) 2004-11-26 2009-09-22 Hitachi Industrial Equipment Systems Co., Ltd. Mold with ejector pin cooling
CN105479691A (en) * 2015-12-31 2016-04-13 江苏大通汽车模具零部件有限公司 Combined ejector rod

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