JPH03124409A - Molding device for undercut molded form - Google Patents

Molding device for undercut molded form

Info

Publication number
JPH03124409A
JPH03124409A JP26014589A JP26014589A JPH03124409A JP H03124409 A JPH03124409 A JP H03124409A JP 26014589 A JP26014589 A JP 26014589A JP 26014589 A JP26014589 A JP 26014589A JP H03124409 A JPH03124409 A JP H03124409A
Authority
JP
Japan
Prior art keywords
core
slide core
return pin
ejector
mold
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
JP26014589A
Other languages
Japanese (ja)
Inventor
Hisao Uchida
内田 久雄
Hiroshi Sato
弘史 佐藤
Kazuyoshi Nagashima
永島 和義
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.)
Alps Alpine Co Ltd
Original Assignee
Alps Electric 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 Alps Electric Co Ltd filed Critical Alps Electric Co Ltd
Priority to JP26014589A priority Critical patent/JPH03124409A/en
Publication of JPH03124409A publication Critical patent/JPH03124409A/en
Pending legal-status Critical Current

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17Component parts, details or accessories; Auxiliary operations
    • B29C45/40Removing or ejecting moulded articles
    • B29C45/44Removing or ejecting moulded articles for undercut articles
    • B29C45/4435Removing or ejecting moulded articles for undercut articles using inclined, tiltable or flexible undercut forming elements driven by the ejector means

Landscapes

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

Abstract

PURPOSE:To avoid trouble such as scoring of a mold and to maintain high mass- productivity by interposing an ejector return pin between an ejector plate and a slant slide core and fixing the ejector return pin to the ejector plate and also freely slidingly supporting the slant slide core to the ejector return pin to the horizontal direction. CONSTITUTION:An ejector return pin 5 standing on an ejector plate 2 is vertically held in a locked state. A slant slide core 4 with a notch 4a provided to the upper end part is freely slidably inserted into a retainer plate 3. This slant slide core 4 has short dimension and the upper end part 5a of the ejector return pin 5 is freely inserted into a recessed groove 4b whose cross-section of the lower end part is nearly formed into a T-shape. This pin 5 freely slidingly supports the core 4 to the horizontal direction. A product 1 is molded and thereafter while the ejector plate 2 is driven and the core 4 is slid to the horizontal direction for the pin 5, the core 4 is raised at the prescribed rate along the longitudinal direction. The undercut part 1a of the product 1 is separated and released from the notch 4a of the core 4. In this case, concentration of stress based on flexure is not caused in the core 4 and therefore such possibility is prevented that scoring of a mold may be generated and the core 4 itself is broken.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、アンダーカット成形品の成形装置に係り、特
に、斜めスライドコアを有する成形装置の改良に関する
DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a molding device for undercut molded products, and particularly to an improvement in a molding device having an oblique slide core.

〔従来の技術〕[Conventional technology]

第4図に示す如きアンダーカット部1aを有する製品1
を成形しようとする場合、金型を上下に型開きしてエジ
ェクタピンの突き出しにより製品1を離型させることは
極めて困難である。そのため、離型時にアンダーカット
部1aを手指にて押し広げるという手法が採用されるこ
ともあるが、このような作業工程は量産性に支障をきた
してしまい、作業安全性の面でも問題があった。
Product 1 having an undercut portion 1a as shown in FIG.
When trying to mold a product 1, it is extremely difficult to open the mold vertically and release the product 1 by ejecting the ejector pin. For this reason, a method is sometimes adopted in which the undercut portion 1a is pushed apart with fingers when releasing the mold, but such a process hinders mass production and poses problems in terms of work safety. Ta.

そこで、従来より、斜めスライドコアを有する成形装置
を用いて、アンダーカット成形品を成形するという手法
が知られている。すなわち、第5図に示す従来のこの種
成形装置の可動型の部分説明図において、エジェクタプ
レート2に支持され型板3に挿通された長尺の斜めスラ
イドコア4は、該エジェクタプレート2上を水平方向(
矢印八方向)に摺動自在であるとともに咳型1rFi、
3に対し自身の長手方向(矢印B方向)に摺動自在であ
って、この可動型を図示せぬ固定型と組み合わせて画成
したキャビティ内に溶融樹脂を充填し、これを冷却固化
することにより製品1が成形され、このとき、斜めスラ
イドコア4の上端部の切欠4aにて該製品10アンダー
カット部1aが成形されるようになっている。そして、
成形固化後は、第6図に示すように、エジェクタプレー
ト2を駆動して斜めスライドコア4をその長手方向に沿
って上昇させることにより、アンダーカット部1aを切
欠4aから離脱させることができるので、製品1を無理
なく離型させることができて量産性の向上が図れる。
Therefore, a method of molding an undercut molded product using a molding device having a diagonal slide core has been known. That is, in the partial explanatory diagram of the movable mold of the conventional molding apparatus of this type shown in FIG. horizontal direction(
It can be slid freely in the eight directions of arrows) and has a cough type 1rFi,
3, the mold is slidable in its own longitudinal direction (in the direction of arrow B), and the cavity formed by combining this movable mold with a fixed mold (not shown) is filled with molten resin, and the resin is cooled and solidified. The product 1 is molded by the above steps, and at this time, an undercut portion 1a of the product 10 is formed at the notch 4a at the upper end of the diagonal slide core 4. and,
After molding and solidification, as shown in FIG. 6, by driving the ejector plate 2 and raising the diagonal slide core 4 along its longitudinal direction, the undercut portion 1a can be separated from the notch 4a. , the product 1 can be easily released from the mold, and mass productivity can be improved.

〔発明が解決しようとする課題〕[Problem to be solved by the invention]

しかしながら、上述した従来の成形装置の可動型は、エ
ジェクタプレート2を上方へ駆動して斜めスライドコア
4の突き出しを行う離型時に、この斜めスライドコア4
を第6図の鎖線に示す如くに撓ませようとする力が働き
、同図の0部に応力が集中してしまうため、斜めスライ
ドコア4の摺動抵抗が増大して金型カジリが発生したり
、斜めスライドコア4自体が破損する危険性があった。
However, the movable mold of the conventional molding apparatus described above, when releasing the mold by driving the ejector plate 2 upward to eject the diagonal slide core 4,
As shown by the chain line in Fig. 6, a force is applied to bend the die, and the stress is concentrated at the 0 part in Fig. 6, which increases the sliding resistance of the diagonal slide core 4 and causes mold galling. There was a risk that the diagonal slide core 4 itself would be damaged.

そして、このようなトラブルが発生すると、生産ライン
を停止しなければならないので、量産性が大きく損なわ
れてしまう。
When such a trouble occurs, the production line must be stopped, which greatly impairs mass productivity.

したがって本発明の目的とするところは、上記従来技術
のt1題を解消し、金型カジリ等のトラブルを回避して
高い1産性が維持できるアンダーカット成形品の成形装
置を提供することにある。
Therefore, it is an object of the present invention to provide a molding apparatus for undercut molded products that can solve the t1 problem of the prior art described above, avoid troubles such as mold galling, and maintain high productivity. .

〔課題を解決するための手段〕[Means to solve the problem]

上記目的を達成するために、本発明は、エジェクタプレ
ートに支持された斜めスライドコアと、この斜めスライ
ドコアを摺動自在に挿通せしめた型板とを有する第1の
金型を、第2の金型と組み合わせてキャビティを画成し
、上記斜めスライドコアに設けた切欠部にて製品のアン
ダーカット部を成形するとともに、上記エジェクタプレ
ートを駆動して上記斜めスライドコアをその長手方向に
沿って上昇させることにより該製品のアンダーカット部
を離型させるアンダーカット成形品の成形装置において
、上記エジェクタプレートと上記斜めスライドコアとの
間に戻しピンを介設し、この戻しピンが該エジェクタプ
レートに固定してあるとともに、この戻しピンが該斜め
スライドコアを水平方間に摺動自在に支持している構成
とした。
In order to achieve the above object, the present invention provides a first mold having a diagonal slide core supported by an ejector plate and a template into which the diagonal slide core is slidably inserted. A cavity is defined in combination with a mold, and an undercut portion of the product is formed using a notch provided in the diagonal slide core, and the ejector plate is driven to move the diagonal slide core along its longitudinal direction. In a molding device for an undercut molded product in which an undercut portion of the product is released from the mold by raising the product, a return pin is interposed between the ejector plate and the diagonal slide core, and the return pin is attached to the ejector plate. The diagonal slide core is fixed, and the diagonal slide core is supported in a horizontally slidable manner by the return pin.

〔作用〕[Effect]

成形固化後にエジェクタプレートを駆動して戻しピンを
上方へ移動させると、斜めスライドコアは該戻しピンに
対し水平方向に摺動しながら自身の長手方向に沿って上
昇するので、製品のアンダーカット部を咳斜めスライド
コアの切欠部から離脱させることができ、また、戻しピ
ンが介設しであることから斜めスライドコアの長手寸法
を短くすることができるので、撓みに起因する応力集中
が起こらなくなって金型カジリや該斜めスライドコア自
体の破損が回避できる。
When the ejector plate is driven to move the return pin upward after molding and solidification, the diagonal slide core slides horizontally with respect to the return pin and rises along its own longitudinal direction, thereby preventing the undercut of the product. can be removed from the notch of the diagonal slide core, and since the return pin is interposed, the longitudinal dimension of the diagonal slide core can be shortened, eliminating stress concentration caused by deflection. As a result, it is possible to avoid mold breakage and damage to the diagonal slide core itself.

〔実施例〕〔Example〕

以下、本発明の実施例を図に基づいて説明する。 Embodiments of the present invention will be described below based on the drawings.

第1図は本発明の一実施例に係る成形装置の可動型の要
部説明図、第2図の第1図のD矢視図、第3図はこの成
形装置の動作説明図であり、第5゜6図と対応する部分
には同一符号が付しである。
FIG. 1 is an explanatory diagram of the main parts of a movable mold of a molding apparatus according to an embodiment of the present invention, FIG. 2 is a view taken in the direction of arrow D in FIG. 1, and FIG. Portions corresponding to those in FIG. 5.6 are given the same reference numerals.

第1〜3図において、エジェクタプレート2上に立設さ
れた戻しピン5は、エジェクタロックプレート6および
回り止めキー7にロックされた状態で鉛直に保持されて
おり、この戻しピン5の上端部5aはドアノブ形状に形
成されている。また、型板3に摺動自在に挿通されて上
端部に切欠4aを設けた斜めスライドコア4は、従来品
に比べて短寸で、この斜めスライドコア4の下端部には
断面略丁字形の凹溝4bが形成されている。そして、斜
めスライドコア4の凹溝4b内に戻しピン5の上端部5
aを遊嵌させることによって、該凹溝4bを該上端部5
aのガイド溝となして戻しピン5は斜めスライドコア4
を水平方向に摺動自在に支持している。
In FIGS. 1 to 3, a return pin 5 erected on the ejector plate 2 is held vertically in a locked state by an ejector lock plate 6 and a detent key 7, and the upper end of the return pin 5 5a is formed in the shape of a doorknob. In addition, the diagonal slide core 4, which is slidably inserted into the template 3 and has a notch 4a at its upper end, is shorter than conventional products, and the lower end of this diagonal slide core 4 has a substantially T-shaped cross section. A concave groove 4b is formed. Then, return the upper end 5 of the pin 5 into the groove 4b of the diagonal slide core 4.
By loosely fitting the groove 4b into the upper end 5
The return pin 5 serves as the guide groove of a, and the diagonal slide core 4
is supported slidably in the horizontal direction.

なお、図中の符号8は受は板、9はスペーサブロック、
10はリターンピン、11は取付板であって、これらは
可動型を構成する通常の部材である。
In addition, the code 8 in the figure is a plate, 9 is a spacer block,
10 is a return pin, and 11 is a mounting plate, which are normal members constituting a movable mold.

さζ、上記の如(に樽成される可動型は、図示せぬ固定
型と組み合わせて画成したキャビティ内に溶融樹脂を充
填し、これを冷却固化することにより、アンダーカット
部1aを有する製品1が成形でき、この後、第3図に示
すように、エジェクタプレート2を駆動して戻しピン5
を上方へ移動させ、斜めスライドコア4を該戻しピン5
に対し水平方向に摺動させながら自身の長手方向に沿っ
て所定量上昇させることにより、製品1のアンダーカッ
ト部1aが該斜めスライドコア4の切欠43から離脱で
きるようにし、該製品1を離型させる。
The movable mold constructed as described above has an undercut portion 1a by filling a cavity formed by combining with a fixed mold (not shown) with molten resin, and cooling and solidifying the resin. After the product 1 is molded, the ejector plate 2 is driven to release the return pin 5 as shown in FIG.
, and move the diagonal slide core 4 to the return pin 5.
By raising the product 1 by a predetermined amount along its longitudinal direction while sliding it horizontally against Make a mold.

そして、斜めスライドコア4の突き出しを行う上記離型
時に、短寸で型板3の下方への突出量が少ない該斜めス
ライドコア4は、従来品のような撓みに起因する応力集
中が起こらないので、円滑な摺動を損なう金型カジリや
該斜めスライドコア4自体の破損といったトラブルを招
来する虞れがなく、高い量産性を維持することができる
。しかも、短寸の斜めスライドコア4は、長寸の従来品
に比べて製作時の加工コストが大幅に低減できるので、
全型代も安くなっている。
When the diagonal slide core 4 is ejected from the mold, the diagonal slide core 4, which is short and has a small amount of downward protrusion from the mold plate 3, does not cause stress concentration due to bending as in conventional products. Therefore, there is no risk of problems such as mold galling that impairs smooth sliding or damage to the diagonal slide core 4 itself, and high mass productivity can be maintained. Moreover, the short diagonal slide core 4 can significantly reduce the processing cost during manufacturing compared to the long conventional product.
All model costs are also cheaper.

〔発明の効果〕〔Effect of the invention〕

以上説明したように、本発明によるアンダーカット成形
品用の成形装置は、斜めスライドコアとエジェクタプレ
ートとの間に戻しピンを介設し、該斜めスライドコアの
長手寸法を短くしであるので、同型時に該斜めスライド
コアに無理な力が加わらなくなって金型カジリ等のトラ
ブルが回避でき、よって高い量産性が維持できるととも
に、斜めスライドコアの加工コストが大幅に低減できる
ことから全型代も安くなる等、優れた効果を奏する。
As explained above, the molding device for undercut molded products according to the present invention has a return pin interposed between the diagonal slide core and the ejector plate to shorten the longitudinal dimension of the diagonal slide core. When the same mold is used, no excessive force is applied to the diagonal slide core, which avoids troubles such as mold galling.This allows high mass production to be maintained, and the overall mold cost is also lower because the processing cost of the diagonal slide core can be significantly reduced. It has excellent effects.

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

第1図ないし第3図は本発明の一実施例に係り、第1図
は成形装置の可動型の要部説明図、第2図は第1図のD
矢視図、第3図はこの成形装置の動作説明図、第4図は
アンダーカット成形品の一例を示す外観図、第5図およ
び第6図は従来例に係り、第5図は成形装置の可動型の
部分説明図、第6図はこの成形装置の動作説明図である
。 1・・・・・・・・・製品(アンダーカット成形品)、
1a・・・・・・・・・アンダーカット部、2・・・・
・・・・・エジェクタプレート、3・・・・・・・・・
型板、4・・・・・・・・・斜めスライドコア、4a・
・・・・・・・・切欠、4b・・・・・・・・・凹溝、
5・・・・・・・・・戻しピン。 第1図 第2図 第3図 第4図 第5図 第6図
1 to 3 relate to one embodiment of the present invention, FIG. 1 is an explanatory diagram of the main part of the movable mold of the molding device, and FIG. 2 is an illustration of the D in FIG.
3 is an explanatory diagram of the operation of this molding device, FIG. 4 is an external view showing an example of an undercut molded product, FIGS. 5 and 6 are related to a conventional example, and FIG. 5 is a diagram of the molding device. FIG. 6 is a partial explanatory diagram of the movable mold, and FIG. 6 is an explanatory diagram of the operation of this molding apparatus. 1...Product (undercut molded product),
1a...Undercut part, 2...
・・・・・・Ejector plate, 3・・・・・・・・・
Template, 4... Diagonal slide core, 4a.
・・・・・・・・・Notch, 4b・・・・・・Concave groove,
5...Return pin. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6

Claims (1)

【特許請求の範囲】[Claims] エジエクタプレートに支持された斜めスライドコアと、
この斜めスライドコアを摺動自在に挿通せしめた型板と
を有する第1の金型を、第2の金型と組み合わせてキャ
ビティを画成し、上記斜めスライドコアに設けた切欠部
にて製品のアンダーカット部を成形するとともに、上記
エジエクタプレートを駆動して上記斜めスライドコアを
その長手方向に沿つて上昇させることにより該製品のア
ンダーカット部を離型させるアンダーカット成形品の成
形装置において、上記エジエクタプレートと上記斜めス
ライドコアとの間に戻しピンを介設し、この戻しピンが
該エジエクタプレートに固定してあるとともに、この戻
しピンが該斜めスライドコアを水平方向に摺動自在に支
持していることを特徴とするアンダーカット成形品の成
形装置。
A diagonal slide core supported by an ejector plate,
A first mold having a template into which the diagonal slide core is slidably inserted is combined with a second mold to define a cavity, and the notch provided in the diagonal slide core is used to produce a product. In a molding device for an undercut molded product, the undercut portion of the product is molded and the undercut portion of the product is released by driving the ejector plate to raise the diagonal slide core along its longitudinal direction. , a return pin is interposed between the ejector plate and the diagonal slide core, the return pin is fixed to the ejector plate, and the return pin slides the diagonal slide core in the horizontal direction. A molding device for undercut molded products, characterized by being freely supported.
JP26014589A 1989-10-06 1989-10-06 Molding device for undercut molded form Pending JPH03124409A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP26014589A JPH03124409A (en) 1989-10-06 1989-10-06 Molding device for undercut molded form

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP26014589A JPH03124409A (en) 1989-10-06 1989-10-06 Molding device for undercut molded form

Publications (1)

Publication Number Publication Date
JPH03124409A true JPH03124409A (en) 1991-05-28

Family

ID=17343934

Family Applications (1)

Application Number Title Priority Date Filing Date
JP26014589A Pending JPH03124409A (en) 1989-10-06 1989-10-06 Molding device for undercut molded form

Country Status (1)

Country Link
JP (1) JPH03124409A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2219196A1 (en) * 2004-04-28 2004-11-16 Comercial De Utiles Y Moldes, S.A. Guide rail mechanism for molding and expulsion of negatives is used in injection molds
CN102814944A (en) * 2012-05-31 2012-12-12 昆山拓安塑料制品有限公司 Headlight decorative plate inclined top
CN103029268A (en) * 2011-10-10 2013-04-10 汉达精密电子(昆山)有限公司 Side core-pulling mechanism
KR101332187B1 (en) * 2011-04-05 2013-11-22 성원모 A eject apparatus of mould for undercut-type product
CN111633927A (en) * 2019-03-01 2020-09-08 苏州汉扬精密电子有限公司 Insert core-pulling structure

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2219196A1 (en) * 2004-04-28 2004-11-16 Comercial De Utiles Y Moldes, S.A. Guide rail mechanism for molding and expulsion of negatives is used in injection molds
KR101332187B1 (en) * 2011-04-05 2013-11-22 성원모 A eject apparatus of mould for undercut-type product
CN103029268A (en) * 2011-10-10 2013-04-10 汉达精密电子(昆山)有限公司 Side core-pulling mechanism
CN103029268B (en) * 2011-10-10 2016-09-07 汉达精密电子(昆山)有限公司 Side core-pulling mechanism
CN102814944A (en) * 2012-05-31 2012-12-12 昆山拓安塑料制品有限公司 Headlight decorative plate inclined top
CN111633927A (en) * 2019-03-01 2020-09-08 苏州汉扬精密电子有限公司 Insert core-pulling structure

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