JP2003039508A - Injection mold - Google Patents
Injection moldInfo
- Publication number
- JP2003039508A JP2003039508A JP2001236603A JP2001236603A JP2003039508A JP 2003039508 A JP2003039508 A JP 2003039508A JP 2001236603 A JP2001236603 A JP 2001236603A JP 2001236603 A JP2001236603 A JP 2001236603A JP 2003039508 A JP2003039508 A JP 2003039508A
- Authority
- JP
- Japan
- Prior art keywords
- undercut
- forming surface
- molded product
- mold
- core
- 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)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、アンダーカット部
を有した製品（成形品）をその材料の弾性を利用して金
型から無理抜き（強制離型）できるようにした射出成形
金型に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an injection molding die which allows a product (molded article) having an undercut portion to be forcibly removed (forced release) from a die by utilizing the elasticity of the material. .
【０００２】[0002]
【従来の技術】この種の射出成形金型として、図６及び
図７に示すものがある。この射出成形金型１は、固定金
型２上に可動金型３を型閉じ・型開き自在に配置してあ
る。これら固定金型２と可動金型３との間には製品（成
形品）８を射出成形するキャビティ４を形成してある。
また、このキャビティ４の一側部には、製品８の外側ア
ンダーカット部９を射出成形する凹部６を有したスライ
ドコア５をアンギュラーピン（傾斜ピン）７等を介して
斜め上下方向に移動自在にしてある。2. Description of the Related Art An injection mold of this type is shown in FIGS. In this injection molding die 1, a movable die 3 is arranged on a fixed die 2 so that the die can be closed and opened. A cavity 4 for injection molding a product (molded product) 8 is formed between the fixed mold 2 and the movable mold 3.
In addition, a slide core 5 having a recess 6 for injection-molding an outer undercut portion 9 of a product 8 is moved to one side of the cavity 4 in an obliquely vertical direction via an angular pin (tilt pin) 7 or the like. It's free.
【０００３】そして、図６に示すように、固定金型２と
可動金型３との間のキャビティ４及びスライドコア５の
凹部６間で射出成形された外側アンダーカット部９を有
した製品８は、可動金型３を型開き（離型）した後で、
図７に示すように、アンギュラーピン７等を介してスラ
イドコア５を離型方向の斜め上方へ移動させることによ
り、固定金型２から抜き取られるようになっている。Then, as shown in FIG. 6, a product 8 having an outer undercut portion 9 injection-molded between the cavity 4 between the fixed die 2 and the movable die 3 and the recess 6 of the slide core 5. After the movable mold 3 is opened (released),
As shown in FIG. 7, the slide core 5 can be pulled out from the fixed mold 2 by moving the slide core 5 obliquely upward in the mold release direction via the angular pin 7 and the like.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、前記従
来の射出成形金型１では、アンギュラーピン７等を介し
てスライドコア５を斜め上方へ移動させることにより外
側アンダーカット部９を有した製品８を固定金型２から
抜き取る構造であるため、製品（成形品）の内部の狭い
空間にアンダーカット部（内側アンダーカット部）があ
る場合には対処することが難しかった。However, in the conventional injection molding die 1, the product 8 having the outer undercut portion 9 is formed by moving the slide core 5 obliquely upward through the angular pin 7 or the like. Since it is a structure in which the product is extracted from the fixed mold 2, it is difficult to cope with the case where there is an undercut part (inner undercut part) in a narrow space inside the product (molded product).
【０００５】そこで、本発明は、前記した課題を解決す
べくなされたものであり、成形品の内側アンダーカット
部を簡単且つ確実に無理抜き処理することができる射出
成形金型を提供することを目的とする。Therefore, the present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide an injection molding die capable of easily and surely forcibly removing the inner undercut portion of a molded product. To aim.
【０００６】[0006]
【課題を解決するための手段】請求項１の発明は、固定
金型と可動金型との間に成形品を射出成形するキャビテ
ィを形成すると共に、前記固定金型と該固定金型に貫通
自在に設けられたピン状のアンダーカットコアとの間に
前記成形品のアンダーカット部を射出成形する凹部を形
成し、このアンダーカット部を有した前記成形品を無理
抜きする突き出しピンを前記アンダーカットコアに対し
て平行に設けた射出成形金型であって、前記固定金型に
前記成形品の内側を成形する凸状のキャビティ形成面を
形成すると共に内側アンダーカット部を成形する凹状の
アンダーカット形成面を形成し、前記可動金型の前記凸
状のキャビティ形成面に対向する位置に前記成形品の外
側を成形する凹状のキャビティ形成面を形成し、前記固
定金型の凹状のアンダーカット形成面に前記アンダーカ
ットコアが貫通して摺動する貫通孔を設けると共に、該
固定金型の凸状のキャビティ形成面に前記突き出しピン
が貫通して摺動する貫通孔を設け、この突き出しピン
に、前記成形品の内側アンダーカット部の無理抜き時に
前記可動金型の離型方向に該突き出しピンを移動させる
作動体を連結し、且つ前記アンダーカットコアに、前記
成形品の内側アンダーカット部が前記固定金型の凹状の
アンダーカット形成面から離型するまで前記突き出しピ
ンの移動に連動して該アンダーカットコアの移動を許容
する規制部を設けたことを特徴とする。According to a first aspect of the present invention, a cavity for injection molding a molded product is formed between a fixed mold and a movable mold, and the fixed mold and the fixed mold are penetrated. A recess for injection-molding the undercut portion of the molded product is formed between the pin-shaped undercut core that is freely provided, and the ejection pin forcibly removing the molded product having this undercut portion is provided under the undercut. An injection molding die provided parallel to a cut core, wherein a convex cavity forming surface for molding the inside of the molded product is formed in the fixed mold, and an inner undercut for forming a concave portion. A cut forming surface is formed, and a concave cavity forming surface for molding the outside of the molded product is formed at a position facing the convex cavity forming surface of the movable mold, and the concave mold of the fixed mold is formed. A through hole through which the undercut core penetrates and slides is provided on the surface for forming a dark cut, and a through hole through which the ejecting pin penetrates and slides is provided on a surface of the fixed mold where the convex cavity is formed. The pin is connected to an operating body that moves the protruding pin in the mold releasing direction of the movable mold when the inner undercut portion of the molded product is forcedly removed, and the inner undercut of the molded product is connected to the undercut core. It is characterized in that a regulating portion is provided which allows the movement of the undercut core in conjunction with the movement of the ejection pin until the portion is released from the concave undercut forming surface of the fixed mold.
【０００７】この射出成形金型では、作動体により突き
出しピンを可動金型の離型方向へ移動させるだけで、成
形品の内側アンダーカット部の無理抜きが簡単且つ確実
に行われる。In this injection molding die, the inner undercut portion of the molded product can be easily and surely removed simply by moving the ejection pin in the mold releasing direction of the movable die by the actuating member.
【０００８】請求項２の発明は、請求項１記載の射出成
形金型であって、前記アンダーカットコアの規制部が前
記固定金型の貫通孔の回りの一部に当たって該アンダー
カットコアの移動が規制された際に、前記成形品の内側
を保持する成形品保持部を前記固定金型の凸状のキャビ
ティ形成面に設け、この成形品保持部で前記成形品の内
側を保持した状態で前記突き出しピンを前記可動金型の
離型方向に更に移動自在にしたことを特徴とする。According to a second aspect of the present invention, there is provided the injection molding die according to the first aspect, wherein the restriction portion of the undercut core abuts a portion around a through hole of the fixed die to move the undercut core. When the inside of the molded product is held, the molded product holding portion that holds the inside of the molded product is provided on the convex cavity forming surface of the fixed mold, and the molded product holding portion holds the inside of the molded product. It is characterized in that the ejection pin is further movable in a releasing direction of the movable mold.
【０００９】この射出成形金型では、アンダーカットコ
アから成形品の内側アンダーカット部を無理抜きする際
に、固定金型の凸状のキャビティ形成面に設けられた成
形品保持部で成形品の内側を保持するようにしたので、
成形品の傾きやガタ付きによる内側アンダーカット部の
破損が確実に防止される。In this injection molding die, when the inner undercut portion of the molded article is forcibly removed from the undercut core, the molded article holding portion provided on the convex cavity forming surface of the fixed die molds the molded article. Since I tried to hold the inside,
Damage to the inner undercut portion due to tilting or rattling of the molded product is reliably prevented.
【００１０】[0010]
【発明の実施の形態】以下、本発明の一実施形態を図面
に基づいて説明する。BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings.
【００１１】図１は本発明の一実施形態の射出成形金型
を示す断面図、図２（ａ）は同射出成形金型の型開き前
の状態を示す断面図、図２（ｂ）は同射出成形金型の型
開き後で無理抜き前の状態を示す断面図、図２（ｃ）は
同射出成形金型の製品が離型された状態を示す断面図、
図３は同射出成形金型の型開き前の状態の要部を示す拡
大断面図、図４は同射出成形金型の型開き後で無理抜き
前の状態の要部を示す拡大断面図、図５は同射出成形金
型の製品が離型された状態の要部を示す拡大断面図であ
る。FIG. 1 is a sectional view showing an injection molding die according to an embodiment of the present invention, FIG. 2 (a) is a sectional view showing a state before opening the injection molding die, and FIG. 2 (b) is a sectional view. FIG. 2C is a cross-sectional view showing a state of the injection molding die after opening the mold and before forcibly removing, and FIG. 2C is a cross-sectional view showing a state where the product of the injection molding die is released.
FIG. 3 is an enlarged cross-sectional view showing a main part of the injection molding die before opening the mold, and FIG. 4 is an enlarged cross-sectional view showing a main part of the injection molding die after opening the mold and before forcibly removing the mold. FIG. 5 is an enlarged cross-sectional view showing a main part of a state where the product of the injection molding die is released.
【００１２】図１に示すように、射出成形金型１０は、
金属製の固定金型１１上に金属製の可動金型１２を型閉
じ・型開き自在に配置してあり、これら固定金型１１と
可動金型１２との間に製品（成形品）２０を射出成形す
るキャビティ１３を形成してある。また、固定金型１１
と該固定金型１１に貫通自在に設けられた無理抜きコア
としての金属製でピン状のアンダーカットコア１４との
間に製品２０の内側アンダーカット部２１を射出成形す
る凹部１５を形成してある。また、内側アンダーカット
部２１を有した製品２０を無理抜きする金属製の突き出
しピン１６を、アンダーカットコア１４に対して平行に
なるように固定金型１１に貫通自在に設けてある。As shown in FIG. 1, the injection molding die 10 is
The movable mold 12 made of metal is disposed on the fixed mold 11 made of metal so that the mold can be closed and opened. A product (molded product) 20 is provided between the fixed mold 11 and the movable mold 12. A cavity 13 for injection molding is formed. In addition, the fixed mold 11
And a recess 15 for injection molding an inner undercut portion 21 of a product 20 between a metal-made pin-shaped undercut core 14 as a force-removable core provided so as to penetrate through the fixed mold 11. is there. Further, a metal protruding pin 16 for forcibly removing the product 20 having the inner undercut portion 21 is provided so as to be able to penetrate the fixed mold 11 so as to be parallel to the undercut core 14.
【００１３】固定金型１１の上面１１ａ側には製品２０
の内側を成形する凸状のキャビティ形成面１１ｂを形成
してあると共に、可動金型１２の下面１２ａ側の凸状の
キャビティ形成面１１ｂに対向する位置には製品２０の
外側を成形する凹状のキャビティ形成面１２ｂを形成し
てある。これら固定金型１１の凸状のキャビティ形成面
１１ｂと可動金型１２の凹状のキャビティ形成面１２ｂ
との間で上記キャビティ１３が形成されるようになって
いる。また、固定金型１１の凸状のキャビティ形成面１
１ｂの上面側の略中央には内側アンダーカット部２１を
成形する凹状のアンダーカット形成面１１ｃを形成して
ある。The product 20 is provided on the upper surface 11a side of the fixed mold 11.
A convex cavity forming surface 11b for molding the inner side of the product is formed, and at the position facing the convex cavity forming surface 11b on the lower surface 12a side of the movable mold 12, a concave shape for molding the outer side of the product 20 is formed. A cavity forming surface 12b is formed. The convex cavity forming surface 11b of the fixed mold 11 and the concave cavity forming surface 12b of the movable mold 12
The cavity 13 is formed between and. In addition, the convex cavity forming surface 1 of the fixed mold 11
A concave undercut forming surface 11c for forming the inner undercut portion 21 is formed at a substantially center of the upper surface side of 1b.
【００１４】固定金型１１の凹状のアンダーカット形成
面１１ｃの底面にはアンダーカットコア１４が垂直に貫
通して摺動する貫通孔１１ｄを穿設してあると共に、該
固定金型１１の凸状のキャビティ形成面１１ｂの上面の
一側部寄りの位置には突き出しピン１６が垂直に貫通し
て摺動する貫通孔１１ｅを穿設してある。また、突き出
しピン１６の下端部１６ｂには、製品２０の内側アンダ
ーカット部２１の無理抜き時に可動金型１２の離型方向
Ａに該突き出しピン１６を移動させる一対の作動体１
７，１７を連結してある。The bottom surface of the concave undercut forming surface 11c of the fixed mold 11 is provided with a through hole 11d through which the undercut core 14 vertically penetrates and slides, and the fixed mold 11 has a convex shape. A through hole 11e is formed at a position near one side of the upper surface of the cavity forming surface 11b so that the protruding pin 16 vertically penetrates and slides. Further, the lower end portion 16b of the ejection pin 16 has a pair of operating bodies 1 for moving the ejection pin 16 in the mold releasing direction A of the movable mold 12 when the inner undercut portion 21 of the product 20 is forcibly removed.
7, 17 are connected.
【００１５】また、アンダーカットコア１４の上部１４
ａの周面には内側アンダーカット部２１を成形する凹状
のアンダーカット形成面１４ｃを形成してある。これら
アンダーカットコア１４の凹状のアンダーカット形成面
１４ｃと固定金型１１の凹状のアンダーカット形成面１
１ｃとで内側アンダーカット部２１を成形するキャビテ
ィとしての凹部１５が形成されるようになっている。The upper portion 14 of the undercut core 14
A concave undercut forming surface 14c for forming the inner undercut portion 21 is formed on the peripheral surface of a. The concave undercut forming surface 14 c of the undercut core 14 and the concave undercut forming surface 1 of the fixed mold 11.
With 1c, a concave portion 15 is formed as a cavity for molding the inner undercut portion 21.
【００１６】さらに、アンダーカットコア１４の略中央
には、製品２０の内側アンダーカット部２１が固定金型
１１の凹状のアンダーカット形成面１１ｃから離型する
まで突き出しピン１６の移動に連動して該アンダーカッ
トコア１４の移動を許容する環状の段差部（規制部）１
４ｂを一体形成してある。即ち、このアンダーカットコ
ア１４の段差部１４ｂが固定金型１１の貫通孔１１ｄの
回りの下面（一部）１１ｆに当たって該アンダーカット
コア１４の離型方向Ａへの移動が停止（規制）されるよ
うになっている。この際に、図２（ｂ）及び図４に示す
ように、固定金型１１の凸状のキャビティ形成面１１ｂ
の上部１１ｂ′側が製品２０の内側を保持する成形品保
持部になっている。この固定金型１１の凸状のキャビテ
ィ形成面１１ｂの上部（成形品保持部）１１ｂ′で製品
２０のフード部２２の内側を保持した状態で突き出しピ
ン１６が可動金型１２の離型方向Ａに更に移動するよう
になっている。Further, approximately at the center of the undercut core 14, the inner undercut portion 21 of the product 20 is interlocked with the movement of the ejection pin 16 until it is released from the concave undercut forming surface 11c of the fixed mold 11. An annular step portion (regulating portion) 1 that allows the movement of the undercut core 14
4b is integrally formed. That is, the step portion 14b of the undercut core 14 hits the lower surface (part) 11f around the through hole 11d of the fixed mold 11 to stop (restrict) the movement of the undercut core 14 in the releasing direction A. It is like this. At this time, as shown in FIGS. 2B and 4, the convex cavity forming surface 11b of the fixed mold 11 is formed.
The upper part 11b 'side of this is a molded product holding part for holding the inside of the product 20. With the upper part (molded product holding part) 11b 'of the convex cavity forming surface 11b of the fixed mold 11 holding the inside of the hood part 22 of the product 20, the ejecting pin 16 moves in the releasing direction A of the movable mold 12. It is designed to move further.
【００１７】尚、アンダーカットコア１４の大径側の下
部１４ｄは各作動体１７を貫通して摺動自在になってい
る。また、下側の作動体１７にはエアシリンダ１８のピ
ストンロッド１９を連結してあり、該エアシリンダ１８
により各作動体１７を介して突き出しピン１６が上下方
向に移動するようになっている。また、可動金型１２の
凹状のキャビティ形成面１２ｂの略中央にはＳＰＶＣ，
ＰＥ，ＰＰ等の成形材料をキャビティ１３内に充填する
ゲート１２ｃを形成してある。さらに、固定金型１１の
上面１１ａと可動金型１２の下面１２ａの接合面がパー
ティングライン（ＰＬ）になっている。The lower portion 14d on the large diameter side of the undercut core 14 penetrates each actuating body 17 and is slidable. A piston rod 19 of an air cylinder 18 is connected to the lower actuating body 17, and the air cylinder 18
As a result, the ejection pin 16 can be moved in the vertical direction via each actuating body 17. In addition, SPVC, is formed in the approximate center of the concave cavity forming surface 12b of the movable mold 12.
A gate 12c is formed to fill the cavity 13 with a molding material such as PE or PP. Further, the joining surface between the upper surface 11a of the fixed mold 11 and the lower surface 12a of the movable mold 12 is a parting line (PL).
【００１８】以上実施形態の射出成形金型１０によれ
ば、図１に示すように、固定金型１１と可動金型１２を
型締め（型閉じ）した後でゲート１２ｃより図示しない
溶融した熱硬化性樹脂材をキャビティ１３及び凹部１５
内に充填すると、図２（ａ）及び図３に示すように、フ
ード部２２の内部の狭い空間に内側アンダーカット部２
１を一体突出形成させた製品２０が射出成形される。According to the injection molding die 10 of the above-described embodiment, as shown in FIG. 1, after the fixed die 11 and the movable die 12 are clamped (closed), melted heat (not shown) is applied from the gate 12c. Curable resin material is used for the cavity 13 and the recess 15.
When filled inside, as shown in FIGS. 2 (a) and 3, the inner undercut portion 2 is placed in a narrow space inside the hood portion 22.
A product 20 in which 1 is integrally formed is formed by injection molding.
【００１９】この状態より、図２（ｂ）及び図４に示す
ように、製品２０の内側アンダーカット部２１が固定金
型１１の凹状のアンダーカット形成面１１ｃから離型す
るまで突き出しピン１６を作動体１７及びエアシリンダ
１８を介して可動金型１２の離型方向Ａへ上昇させる。
この際に、アンダーカットコア１４が内側アンダーカッ
ト部２１に保持されているため、上記突き出しピン１６
の上昇動に連動してアンダーカットコア１４の段差部１
４ｂが固定金型１１の下面１１ｆに当たるまで該アンダ
ーカットコア１４も上昇する。From this state, as shown in FIGS. 2B and 4, the ejection pin 16 is pushed until the inner undercut portion 21 of the product 20 is released from the concave undercut forming surface 11c of the fixed mold 11. The movable mold 12 is lifted in the releasing direction A via the actuating body 17 and the air cylinder 18.
At this time, since the undercut core 14 is held by the inner undercut portion 21, the ejection pin 16 is
The stepped portion 1 of the undercut core 14 is interlocked with the upward movement of
The undercut core 14 also rises until 4b hits the lower surface 11f of the fixed mold 11.
【００２０】この製品２０の内側アンダーカット部２１
が固定金型１１の凹状のアンダーカット形成面１１ｃか
ら離型し、アンダーカットコア１４の凹状のアンダーカ
ット形成面１１ｃから製品２０の内側アンダーカット部
２１が無理抜きされる前の状態では、図２（ｂ）及び図
４に示すように、固定金型１１の凸状のキャビティ形成
面１１ｂの上部に設けられた成形品保持部１１ｂ′で製
品２０のフード部２２の内側が確実に保持されている。The inner undercut portion 21 of this product 20
Is released from the concave undercut forming surface 11c of the fixed mold 11, and before the inner undercut portion 21 of the product 20 is forcibly removed from the concave undercut forming surface 11c of the undercut core 14, 2 (b) and FIG. 4, the inside of the hood portion 22 of the product 20 is securely held by the molded product holding portion 11b 'provided on the convex cavity forming surface 11b of the fixed mold 11. ing.
【００２１】この状態より、図２（ｃ）及び図５に示す
ように、作動体１７及びエアシリンダ１８を介して突き
出しピン１６を可動金型１２の離型方向Ａへ更に上昇さ
せると、製品２０の内側アンダーカット部２１がその材
料の弾性により撓んでアンダーカットコア１４の凹状の
アンダーカット形成面１１ｃから簡単且つ確実に外れ
る。この無理抜きの際に、上述したように、固定金型１
１の凸状のキャビティ形成面１１ｂの成形品保持部１１
ｂ′で製品２０のフード部２２の内側を保持するように
したので、製品２０の内側アンダーカット部２１が傾い
たり、ガタ付くことなく無理抜きされて該内側アンダー
カット部２１の損傷等の破損を確実に防止することがで
きる。このように、同一抜き方向でアンダーカットの処
理を行うことができるため、高品質の内側アンダーカッ
ト部２１を有した製品２０を大量に低コストで製作する
ことができる。From this state, as shown in FIGS. 2 (c) and 5, when the ejecting pin 16 is further raised in the releasing direction A of the movable mold 12 via the actuating body 17 and the air cylinder 18, the product is released. The inner undercut portion 21 of 20 is bent by the elasticity of the material and easily and reliably comes off from the concave undercut forming surface 11c of the undercut core 14. In this forced removal, as described above, the fixed mold 1
Molded product holding portion 11 of convex cavity forming surface 11b of No. 1
Since the inside of the hood portion 22 of the product 20 is held by b ', the inner undercut portion 21 of the product 20 is tilted, and the inner undercut portion 21 is forcibly removed without rattling and the inner undercut portion 21 is damaged. Can be reliably prevented. In this way, since the undercut processing can be performed in the same drawing direction, a large number of products 20 having the high-quality inner undercut portion 21 can be manufactured at low cost.
【００２２】尚、前記実施形態によれば、突き出しピン
の駆動源としてエアシリンダを用いたが、油圧シリンダ
等の他の駆動手段でも良いことは勿論である。また、製
品の内側アンダーカット部として樹脂製の防水コネクタ
のホルダー係止ロック部等に適用する場合について説明
したが、ゴム製のパッキン等に適用できることは勿論で
ある。In the above embodiment, the air cylinder is used as the drive source for the ejection pin, but it goes without saying that other drive means such as a hydraulic cylinder may be used. Further, the case where the invention is applied to the holder locking lock part of the resin waterproof connector as the inner undercut part of the product has been described, but it is needless to say that it can be applied to the rubber packing and the like.
【００２３】[0023]
【発明の効果】以上説明したように、請求項１の発明に
よれば、固定金型の凹状のアンダーカット形成面にアン
ダーカットコアが貫通して摺動する貫通孔を設けると共
に、該固定金型の凸状のキャビティ形成面に突き出しピ
ンが貫通して摺動する貫通孔を設け、この突き出しピン
に、成形品の内側アンダーカット部の無理抜き時に可動
金型の離型方向に該突き出しピンを移動させる作動体を
連結し、且つ、アンダーカットコアに、成形品の内側ア
ンダーカット部が固定金型の凹状のアンダーカット形成
面から離型するまで突き出しピンの移動に連動して該ア
ンダーカットコアの移動を許容する規制部を設けたの
で、作動体により突き出しピンを可動金型の離型方向へ
移動させるだけの簡単な動作で、成形品の内側アンダー
カット部の無理抜きを容易且つ確実に行うことができ
る。As described above, according to the first aspect of the invention, a through hole through which an undercut core penetrates and slides is provided on a concave undercut forming surface of a fixed mold, and the fixed metal is formed. A through hole is formed in the convex cavity forming surface of the mold so that the protruding pin penetrates and slides.The protruding pin is moved in the mold releasing direction of the movable mold when the inner undercut portion of the molded product is forcibly removed. The undercut core is linked with the undercut core until the inner undercut part of the molded product is released from the concave undercut formation surface of the fixed mold to the undercut core. Since the regulation part that allows movement of the core is provided, it is possible to easily remove the inner undercut part of the molded product with a simple operation of moving the ejector pin in the mold releasing direction of the movable mold by the operating body. It can be easily and reliably.
【００２４】請求項２の発明によれば、アンダーカット
コアから成形品の内側アンダーカット部を無理抜きする
際に、固定金型の凸状のキャビティ形成面に設けられた
成形品保持部で成形品の内側を保持するようにしたの
で、成形品の傾きやガタ付きによる内側アンダーカット
部の破損を確実に防止することができ、高品質の内側ア
ンダーカット部を有した成形品を製作することができ
る。According to the second aspect of the present invention, when the inner undercut portion of the molded product is forcibly removed from the undercut core, molding is performed by the molded product holding portion provided on the convex cavity forming surface of the fixed mold. Since the inside of the product is held, it is possible to reliably prevent damage to the inner undercut part due to tilting or backlash of the molded product, and to manufacture a molded product with a high quality inner undercut part. You can
【図１】本発明の一実施形態の射出成形金型を示す断面
図である。FIG. 1 is a sectional view showing an injection mold according to an embodiment of the present invention.
【図２】（ａ）は上記射出成形金型の型開き前の状態を
示す断面図、（ｂ）は同射出成形金型の型開き後で無理
抜き前の状態を示す断面図、（ｃ）は同射出成形金型の
製品が離型された状態を示す断面図である。FIG. 2 (a) is a cross-sectional view showing a state before opening of the injection molding die, FIG. 2 (b) is a cross-sectional view showing a state after opening the injection molding die but before forcibly removing, and FIG. FIG. 8A) is a cross-sectional view showing a state where the product of the injection molding die is released.
【図３】上記射出成形金型の型開き前の状態の要部を示
す拡大断面図である。FIG. 3 is an enlarged cross-sectional view showing a main part of the injection molding die before being opened.
【図４】上記射出成形金型の型開き後で無理抜き前の状
態の要部を示す拡大断面図である。FIG. 4 is an enlarged cross-sectional view showing a main part of the injection molding die after opening the mold and before forcibly removing the mold.
【図５】上記射出成形金型の製品が離型された状態の要
部を示す拡大断面図である。FIG. 5 is an enlarged cross-sectional view showing a main part of the product of the injection molding die in a released state.
【図６】従来例の射出成形金型の断面図である。FIG. 6 is a cross-sectional view of a conventional injection molding die.
【図７】上記従来例の射出成形金型の製品が離型された
状態を示す断面図である。FIG. 7 is a cross-sectional view showing a state where a product of the injection molding die of the conventional example is released.
１０ 射出成形金型 １１ 固定金型 １１ｂ 凸状のキャビティ形成面 １１ｂ′ 上部（成形品保持部） １１ｃ 凹状のアンダーカット形成面 １１ｄ 貫通孔 １１ｅ 貫通孔 １１ｆ 下面（一部） １２ 可動金型 １２ｂ 凹状のキャビティ形成面 １３ キャビティ １４ アンダーカットコア １４ｂ 環状の段差部（規制部） １５ 凹部（キャビティ） １６ 突き出しピン １７ 作動体 ２０ 製品（成形品） ２１ 内側アンダーカット部 Ａ 可動金型の離型方向 10 Injection mold 11 Fixed mold 11b Convex cavity forming surface 11b 'Upper part (molded product holding part) 11c Recessed undercut forming surface 11d through hole 11e through hole 11f Lower surface (part) 12 movable mold 12b Recessed cavity forming surface 13 cavities 14 Undercut core 14b Annular step (regulating part) 15 Recess (cavity) 16 protruding pin 17 Actuator 20 products (molded products) 21 Inner undercut A Releasing direction of movable mold
───────────────────────────────────────────────────── フロントページの続き (72)発明者 鈴木 淳滋 静岡県榛原郡榛原町布引原206−１ 矢崎 部品株式会社内 (72)発明者 村上 孝夫 静岡県榛原郡榛原町布引原206−１ 矢崎 部品株式会社内 Ｆターム(参考） 4F202 CA11 CB01 CK54 CM02 CM31 ─────────────────────────────────────────────────── ─── Continued front page (72) Inventor Atsushi Suzuki 206-1 Nunobikihara, Haibara-cho, Haibara-gun, Shizuoka Prefecture Yazaki Parts Co., Ltd. (72) Inventor Takao Murakami 206-1 Nunobikihara, Haibara-cho, Haibara-gun, Shizuoka Prefecture Yazaki Parts Co., Ltd. F-term (reference) 4F202 CA11 CB01 CK54 CM02 CM31
Claims (2)
出成形するキャビティを形成すると共に、前記固定金型
と該固定金型に貫通自在に設けられたピン状のアンダー
カットコアとの間に前記成形品のアンダーカット部を射
出成形する凹部を形成し、このアンダーカット部を有し
た前記成形品を無理抜きする突き出しピンを前記アンダ
ーカットコアに対して平行に設けた射出成形金型であっ
て、 前記固定金型に前記成形品の内側を成形する凸状のキャ
ビティ形成面を形成すると共に内側アンダーカット部を
成形する凹状のアンダーカット形成面を形成し、前記可
動金型の前記凸状のキャビティ形成面に対向する位置に
前記成形品の外側を成形する凹状のキャビティ形成面を
形成し、前記固定金型の凹状のアンダーカット形成面に
前記アンダーカットコアが貫通して摺動する貫通孔を設
けると共に、該固定金型の凸状のキャビティ形成面に前
記突き出しピンが貫通して摺動する貫通孔を設け、この
突き出しピンに、前記成形品の内側アンダーカット部の
無理抜き時に前記可動金型の離型方向に該突き出しピン
を移動させる作動体を連結し、且つ前記アンダーカット
コアに、前記成形品の内側アンダーカット部が前記固定
金型の凹状のアンダーカット形成面から離型するまで前
記突き出しピンの移動に連動して該アンダーカットコア
の移動を許容する規制部を設けたことを特徴とする射出
成形金型。1. A pin-shaped undercut core provided with a cavity for injection-molding a molded product between a fixed mold and a movable mold, and a pin-shaped undercut core penetratingly provided in the fixed mold. Injection molding in which a recessed portion for injection-molding the undercut portion of the molded product is formed between and, and a protrusion pin for forcibly removing the molded product having the undercut portion is provided in parallel with the undercut core. A movable mold, wherein the fixed mold is formed with a convex cavity forming surface for molding the inside of the molded product and a concave undercut forming surface for molding an inner undercut portion, A concave cavity forming surface for molding the outside of the molded product is formed at a position opposite to the convex cavity forming surface of the fixed mold, and the undermold is formed on the concave undercut forming surface of the fixed mold. A through-hole through which the contact core penetrates and slides, and a through-hole through which the protrusion pin penetrates and slides on the convex cavity forming surface of the fixed mold, and the protrusion pin is provided with a through-hole. When the inner undercut portion is forcibly removed, an operating body that moves the protrusion pin in the mold releasing direction of the movable die is connected, and the inner undercut portion of the molded product is connected to the undercut core by the fixed die. An injection-molding die, characterized in that a regulating portion is provided which allows the movement of the undercut core in conjunction with the movement of the ejection pin until it is released from the concave undercut forming surface.
孔の回りの一部に当たって該アンダーカットコアの移動
が規制された際に、前記成形品の内側を保持する成形品
保持部を前記固定金型の凸状のキャビティ形成面に設
け、この成形品保持部で前記成形品の内側を保持した状
態で前記突き出しピンを前記可動金型の離型方向に更に
移動自在にしたことを特徴とする射出成形金型。2. The injection-molding die according to claim 1, wherein when the regulation portion of the undercut core hits a part around the through hole of the fixed die, the movement of the undercut core is regulated. In the above, a molded product holding portion for holding the inside of the molded product is provided on the convex cavity forming surface of the fixed mold, and the ejection pin is attached to the molded product holding portion while holding the inside of the molded product. An injection molding die characterized by being further movable in the releasing direction of the movable die.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001236603A JP3618700B2 (en) | 2001-08-03 | 2001-08-03 | Injection mold |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001236603A JP3618700B2 (en) | 2001-08-03 | 2001-08-03 | Injection mold |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2003039508A true JP2003039508A (en) | 2003-02-13 |
| JP3618700B2 JP3618700B2 (en) | 2005-02-09 |
Family
ID=19067834
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001236603A Expired - Fee Related JP3618700B2 (en) | 2001-08-03 | 2001-08-03 | Injection mold |
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| Country | Link |
|---|---|
| JP (1) | JP3618700B2 (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100814928B1 (en) | 2006-09-01 | 2008-03-19 | 한국단자공업 주식회사 | Die assembly |
| JP2010236644A (en) * | 2009-03-31 | 2010-10-21 | Denso Corp | Connecting joint and method of manufacturing the same |
| JP2010257697A (en) * | 2009-04-23 | 2010-11-11 | Yazaki Corp | Molding die structure of housing, molding method for housing, and housing |
| JP2011189683A (en) * | 2010-03-16 | 2011-09-29 | Alps Electric Co Ltd | Injection molding body |
| CN104723515A (en) * | 2013-12-20 | 2015-06-24 | 汉达精密电子(昆山)有限公司 | Mould ejector pin structure |
| JP2015131441A (en) * | 2014-01-14 | 2015-07-23 | 有限会社ベストテクニカル | Mold device for injection molding |
| JP5762649B1 (en) * | 2014-06-16 | 2015-08-12 | ケンモールドサービス株式会社 | Mold release support device |
-
2001
- 2001-08-03 JP JP2001236603A patent/JP3618700B2/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100814928B1 (en) | 2006-09-01 | 2008-03-19 | 한국단자공업 주식회사 | Die assembly |
| JP2010236644A (en) * | 2009-03-31 | 2010-10-21 | Denso Corp | Connecting joint and method of manufacturing the same |
| JP2010257697A (en) * | 2009-04-23 | 2010-11-11 | Yazaki Corp | Molding die structure of housing, molding method for housing, and housing |
| JP2011189683A (en) * | 2010-03-16 | 2011-09-29 | Alps Electric Co Ltd | Injection molding body |
| CN104723515A (en) * | 2013-12-20 | 2015-06-24 | 汉达精密电子(昆山)有限公司 | Mould ejector pin structure |
| JP2015131441A (en) * | 2014-01-14 | 2015-07-23 | 有限会社ベストテクニカル | Mold device for injection molding |
| JP5762649B1 (en) * | 2014-06-16 | 2015-08-12 | ケンモールドサービス株式会社 | Mold release support device |
| WO2015193936A1 (en) * | 2014-06-16 | 2015-12-23 | ケンモールドサービス株式会社 | Release assistance device for molded article |
| EP3156203A4 (en) * | 2014-06-16 | 2018-05-02 | Ecovent Kabushiki Kaisha | Release assistance device for molded article |
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| Publication number | Publication date |
|---|---|
| JP3618700B2 (en) | 2005-02-09 |
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