JP2006095922A - Ejector pin of split mold for synthetic resin injection molding - Google Patents

Ejector pin of split mold for synthetic resin injection molding Download PDF

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JP2006095922A
JP2006095922A JP2004285977A JP2004285977A JP2006095922A JP 2006095922 A JP2006095922 A JP 2006095922A JP 2004285977 A JP2004285977 A JP 2004285977A JP 2004285977 A JP2004285977 A JP 2004285977A JP 2006095922 A JP2006095922 A JP 2006095922A
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hole
movable
ejector pin
plate
movable side
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Eiji Yonezawa
栄司 米沢
Takayuki Shigeno
隆之 茂野
Takahiro Yamamuro
貴洋 山室
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Techno Excel KK
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Abstract

<P>PROBLEM TO BE SOLVED: To provide an ejector pin 70 which can replace a conventional ejector pin 30 for preventing or reducing troubles such as fixing, bending or the like. <P>SOLUTION: A spiral groove 74 is formed on an outer periphery of a cylindrical body part 72 of the ejector pin 70 excluding both end parts (a head part 71 and a shoulder part 73) in order to release gas and residual foreign substances. When synthetic resin injection molding is completed and an ejector plate 20 is moved for removing a formed molding 60, the ejector pin 70 slides and projects from a movable side retainer plate 40 through a through-hole B of a movable side nest B41 without rotating so as to remove the residual foreign substances or the like of the synthetic resin adhered inside the through-hole B of the movable side nest B41. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、主に合成樹脂を成形する射出成形機に取り付けられる割型式金型の可動側型板側に配設されるエジェクタピンに係るものであり、詳しくは成形品をエジェクタピンで突き出しする時にガス及び残留異物を逃がす通路を提供すると共に、可動側型板に設けられた貫通孔A内と、該可動側型板に埋設される可動側入れ子Bに設けられた貫通孔B内と、該貫通孔A内と該貫通孔B内とを摺動するエジェクタピンと、の固着防止等が期待できるエジェクタピンの改善に関する。   The present invention mainly relates to an ejector pin disposed on a movable mold plate side of a split mold attached to an injection molding machine for molding a synthetic resin. Specifically, a molded product is ejected by an ejector pin. While providing a passage for sometimes releasing gas and residual foreign matter, in the through hole A provided in the movable side mold plate, and in the through hole B provided in the movable side insert B embedded in the movable side mold plate, The present invention relates to an improvement in an ejector pin that can be expected to prevent sticking between an ejector pin that slides in the through hole A and in the through hole B.

例えば、ABS樹脂、PP樹脂等の合成樹脂成形部材等で、成形品を形成する一般的な横型射出成形機には、
表面部に固定側入れ子(螺着された固定コア)を有する固定側型板と、該固定側型板の裏面部側に配設される固定側取付板と、必要により該固定側取付板と該固定側型板との間に挟着されるアンギュラピン(可動側型板にスライドコアが無ければ不要)と、からなる固定側ユニットと、
スペーサと、表面部には必要により上下左右等に配設され該アンギュラピンで拡開及び離隔張する複数のスライドコア(可動コア)と可動側入れ子A(螺着された固定コア)及び/又は貫通孔Bを有する可動側入れ子B(螺着された固定コア)を有し該貫通孔Bに連通する貫通孔Aを有する可動側型板と、一端部である頭部と他端部であるショルダ部と円柱状本体部とからなり該可動側型板の貫通孔A内と該可動側入れ子Bの貫通孔B内とを摺動するように挿入されるエジェクタピン(成形品突出ピン)と、該可動側型板の裏面部側に配設され外力(通常は下記に説明する成形機本体に設けられた成形品突出機構の往復動との連動)により往復動ができ表面部に該エジェクタピンのショルダ部が固定できるエジェクタプレート(実際にはエジェクタプレートAとエジェクタプレートBとで該ショルダ部を挟着する)と、該エジェクタプレートの裏面部側に配設される可動側取付板と、からなる可動側ユニットと、
からなり、該固定側型板の表面部と該可動側型板の表面部とを合わせることにより、内部空間であるキャビティを形成する割型式金型が取り付けられるようになっている。
合成樹脂射出成形とは、このキャビティ内に溶けた合成樹脂を充填することにより、成形品が形成されることをいう。
For example, a general horizontal injection molding machine that forms a molded product with a synthetic resin molding member such as ABS resin or PP resin,
A fixed-side mold plate having a fixed-side insert (a fixed core screwed) on the surface portion, a fixed-side mounting plate disposed on the back surface side of the fixed-side mold plate, and, if necessary, the fixed-side mounting plate; An angular pin sandwiched between the fixed side mold plate (unnecessary if the movable side mold plate does not have a slide core), and a fixed side unit comprising:
Spacers, a plurality of slide cores (movable cores) and movable side inserts A (screwed fixed cores) which are arranged on the surface portion as needed, vertically and horizontally, etc. and are expanded and separated by the angular pins, and / or A movable side mold plate having a movable side insert B (a screwed fixed core) having a through hole B and having a through hole A communicating with the through hole B; a head portion as one end portion; and a second end portion. An ejector pin (molded product protruding pin) which is formed by a shoulder portion and a cylindrical main body portion and which is inserted so as to slide in the through hole A of the movable side template and the through hole B of the movable side insert B; The ejector is disposed on the surface portion of the movable side mold plate and can be reciprocated by an external force (usually interlocked with the reciprocating motion of a molded product protruding mechanism provided in the molding machine main body described below). Ejector plate that can fix the shoulder of the pin Kuta plate A and the ejector plate B to pinched) said shoulder portion with a movable side mounting plate which is arranged on the back side of the ejector plates, and the movable unit consisting of,
A split mold that forms a cavity that is an internal space is attached by combining the surface portion of the fixed-side mold plate and the surface portion of the movable-side mold plate.
Synthetic resin injection molding means that a molded product is formed by filling a melted synthetic resin in the cavity.

該横型射出成形機は、成形機本体と、該成形機本体に設けられた成形品突出(エジェクト)機構(例えば、電動式、油圧式)と、該成形機本体に設けられた型締め機構(例えば、電動式、油圧式)と、該型締め機構と対置する固定側ダイプレートと、該型締め機構と該固定側ダイプレートとを連結する数本のダイバー(軸)と、該型締め機構と該固定側ダイプレートとの間に設けられ該ダイバーが軸通され該型締め機構で往復動できる可動側ダイプレートと、該固定側ダイプレートの外部から合成樹脂が供給できるように、ホッパー、シリンダ、ノズル等を有する射出装置と、該射出装置を制御する制御盤と、から構成されている。
該固定側ダイプレートには、該固定側ユニットが取り付けられ、該可動側ダイプレートには、該可動側ユニットが取り付けられ、該可動側ユニットのエジェクタプレートは該成形品突出機構と連結され往復動できるようになっている。
The horizontal injection molding machine includes a molding machine main body, a molded product projecting (ejecting) mechanism (for example, electric or hydraulic) provided in the molding machine main body, and a mold clamping mechanism ( For example, electric type, hydraulic type), a fixed side die plate facing the mold clamping mechanism, several divers (shafts) connecting the mold clamping mechanism and the fixed side die plate, and the mold clamping mechanism A movable side die plate that is provided between the fixed side die plate and can be reciprocated by the clamping mechanism, so that a synthetic resin can be supplied from the outside of the fixed side die plate, The injection device includes a cylinder, a nozzle, and the like, and a control panel that controls the injection device.
The fixed-side unit is attached to the fixed-side die plate, the movable-side unit is attached to the movable-side die plate, and the ejector plate of the movable-side unit is connected to the molded product protruding mechanism to reciprocate. It can be done.

さて、合成樹脂射出成形が完了し、形成された成形品を取り出すために、該成形品突出機構に連結される該エジェクタプレートが移動すると、該エジェクタプレートに固定された該エジェクタピンは、該動側型板の貫通孔A内と、該可動側入れ子Bの貫通孔B内と、を摺動することになる。
しかし、合成樹脂射出成形の成形工程を繰り返していると、該可動側入れ子Bの貫通孔B内には徐々に合成樹脂の残留異物が付着し、該可動側型板の貫通孔A内と、該可動側入れ子Bの貫通孔B内と、該貫通孔A内と該貫通孔B内とを摺動する該エジェクタピンの頭部や一部の円柱状本体部と、が固着する弊害(障害)や、該成形品突出機構に連結される該エジェクタプレートが移動する時に、該エジェクタピンが折れ曲がる弊害(障害)が発生していた。
この固着現象を防止するために、定期的に該エジェクタプレートに固定された該エジェクタピンを取り外し、該エジェクタピン側を布巾や雑巾等で清拭する必要があった。(有機溶剤等での洗浄は必要では無かった。)
Now, when the plastic injection molding is completed and the ejector plate connected to the molded product protruding mechanism is moved to take out the formed molded product, the ejector pin fixed to the ejector plate is moved. The inside of the through hole A of the side mold plate and the inside of the through hole B of the movable side insert B slide.
However, if the molding process of the synthetic resin injection molding is repeated, residual foreign matter of the synthetic resin gradually adheres in the through hole B of the movable side insert B, and in the through hole A of the movable side mold plate, Adverse effects (disturbances) that the inside of the through hole B of the movable side insert B, the head of the ejector pin that slides in the through hole A and the inside of the through hole B, and a part of the cylindrical main body are fixed. ), Or when the ejector plate connected to the molded product protruding mechanism moves, the ejector pin is bent (disorder).
In order to prevent this sticking phenomenon, it is necessary to periodically remove the ejector pin fixed to the ejector plate and wipe the ejector pin side with a cloth or a dust cloth. (Cleaning with organic solvent was not necessary.)

この弊害を防止する改善とは異なるが、合成樹脂射出成形が完了し、形成された成形品を取り出すために、該成形品突出機構に連結される該エジェクタプレートが移動すると、該エジェクタプレートに固定された該エジェクタピンが回動(例えば、該エジェクタプレートの往復動において、その往路においては右回転、その復路においては左回転)することにより、固着防止等の効果も期待ができていた(例えば、特許文献1参照。)。   Unlike the improvement to prevent this harmful effect, when the ejector plate connected to the molded product protruding mechanism moves to take out the molded product after the synthetic resin injection molding is completed, it is fixed to the ejector plate. When the ejector pin thus rotated (for example, in the reciprocating motion of the ejector plate, rotates clockwise in the forward path and counterclockwise in the backward path), an effect such as prevention of sticking can be expected (for example, , See Patent Document 1).

実開平2−88719号公報Japanese Utility Model Publication No. 2-88719

しかしながら、特許文献1の技術を採用すると、僅かではあるが、形成された成形品に、こすりきずが残ることが確認された。該エジェクタプレートの往復動において、エジェクタピンの頭部が回動せず円柱状本体部が回動する機構等を採用しても良いが、該エジェクタピンは、かなり細い形状であるばかりか、例えば、SKD焼入れ材等の超硬鉄鋼材からなっているので、追加工等が容易でないという問題点がある。   However, when the technique of Patent Document 1 is employed, it has been confirmed that a rubbed scratch remains in the formed product, although it is slight. In the reciprocating motion of the ejector plate, a mechanism or the like in which the head portion of the ejector pin does not rotate but the cylindrical main body rotates may be adopted, but the ejector pin not only has a very thin shape, for example, Since it is made of a hard steel material such as an SKD hardened material, there is a problem that additional processing is not easy.

本発明は、従来の技術の有するこのような問題点を鑑みてなされたものであり、その目的とするところは、従来のエジェクタピンと置換(互換性有り)ができて、固着、折れ曲がり等の弊害が防止又は減少するという効果が期待できるエジェクタピンを提供しようとするものである。   The present invention has been made in view of such problems of the prior art, and its object is to replace the conventional ejector pin (with compatibility), and to prevent harmful effects such as fixing and bending. Thus, an ejector pin that can be expected to have an effect of preventing or reducing the occurrence of the problem is provided.

上記目的を達成するために、本発明の合成樹脂射出成形用割型式金型のエジェクタピンは、
表面部に固定側入れ子を有する固定側型板と、該固定側型板の裏面部側に配設される固定側取付板と、からなる固定側ユニットと、
表面部に可動側入れ子A(エジェクタピンを設けない可動側入れ子。もちろんエジェクタピンが通る貫通孔も無い)及び/又は貫通孔Bを有する可動側入れ子B(エジェクタピンを設ける可動側入れ子)を有し該貫通孔Bに連通する貫通孔Aを有する可動側型板と、一端部である頭部と他端部であるショルダ部と円柱状本体部とからなり該可動側型板の貫通孔A内と該可動側入れ子Bの貫通孔B内とを摺動するように挿入されるエジェクタピンと、該可動側型板の裏面部側に配設され外力(通常は成形機本体に設けられた成形品突出機構の往復動との連動)により往復動ができ表面部に該エジェクタピンのショルダ部が固定できるエジェクタプレートと、該エジェクタプレートの裏面部側に配設される可動側取付板と、からなる可動側ユニットと、
からなり、該固定側型板の表面部と該可動側型板の表面部とを合わせることにより、内部空間であるキャビティを形成する割型式金型において、
該エジェクタピンの両端部(頭部及びショルダ部)を除く円柱状本体部外周部にガス及び残留異物逃げ通路としてスパイラル溝(切削工具のストレートドリルのようなドリル溝、螺旋溝)を設け、合成樹脂射出成形が完了し形成された成形品を取り出すための(該成形品突出機構に連結される)該エジェクタプレートの移動と共に、該エジェクタピンが該可動側型板から回動しないで該可動側入れ子Bの貫通孔B内を摺動して突き出すことにより、該可動側入れ子Bの貫通孔B内に付着する合成樹脂の残留異物等が除去されることを特徴とする。
In order to achieve the above object, the ejector pin of the split mold for synthetic resin injection molding of the present invention comprises:
A fixed-side unit comprising a fixed-side mold plate having a fixed-side insert on the surface portion, and a fixed-side mounting plate disposed on the back surface side of the fixed-side mold plate,
Movable side nesting A (movable side nesting without ejector pins. Of course, there is no through hole through which the ejector pins pass) and / or movable side nesting B (movable side nesting with ejector pins) having through holes B on the surface. A movable side mold plate having a through hole A communicating with the through hole B, a head portion as one end portion, a shoulder portion as the other end portion, and a cylindrical main body portion. And an ejector pin inserted so as to slide between the inside and the through hole B of the movable side insert B, and an external force (usually provided on the molding machine body) provided on the back side of the movable side template. An ejector plate that can be reciprocated by the reciprocating motion of the product projecting mechanism) and a shoulder portion of the ejector pin can be fixed to the surface portion, and a movable side mounting plate disposed on the back surface side of the ejector plate. The movable side unit And,
In a split mold that forms a cavity that is an internal space by combining the surface portion of the fixed mold plate and the surface portion of the movable mold plate,
Spiral grooves (drill grooves such as straight drills of cutting tools, spiral grooves) are provided on the outer periphery of the cylindrical main body excluding both ends (head and shoulder) of the ejector pin as gas and residual foreign material escape passages. With the movement of the ejector plate (coupled to the molded product protrusion mechanism) for taking out the molded product formed after resin injection molding is completed, the ejector pin does not rotate from the movable side template, and the movable side By sliding and projecting through the through hole B of the nest B, residual foreign matter or the like of the synthetic resin adhering to the through hole B of the movable side nest B is removed.

或いは、該エジェクタピンの両端部(頭部及びショルダ部)を除く円柱状本体部外周部にガス及び残留異物逃げ通路としてトラバース溝(円柱の周壁に設けられ、本来はトラバース摺動子等が誘導できる凹形のカム溝。無限曲線溝[例えば、一周すれば元の位置に戻ってくる曲線溝]又は往復螺旋溝[外周面に互いに逆方向の螺旋溝を交差させて形成してある溝])を設け、合成樹脂射出成形が完了し形成された成形品を取り出すための(該成形品突出機構に連結される)該エジェクタプレートの移動と共に、該エジェクタピンが該可動側型板から回動しないで該可動側入れ子Bの貫通孔B内を摺動して突き出すことにより、該可動側入れ子Bの貫通孔B内に付着する合成樹脂の残留異物等が除去されることを特徴とする。   Alternatively, a traverse groove (provided on the peripheral wall of the cylinder, which is originally provided on the peripheral wall of the cylinder, is guided by a traverse slider, etc.) on the outer periphery of the cylindrical main body excluding both ends (head and shoulder) of the ejector pin. Recessed cam groove, infinitely curved groove [for example, curved groove that returns to its original position after one round] or reciprocating spiral groove [groove formed by intersecting spiral grooves in opposite directions on the outer peripheral surface] ) And the ejector pin is rotated from the movable side mold plate with the movement of the ejector plate (connected to the molded product protruding mechanism) for taking out the molded product formed after the synthetic resin injection molding is completed. The residual foreign matter of the synthetic resin adhering in the through hole B of the movable side insert B is removed by sliding and projecting through the through hole B of the movable side insert B.

従来のエジェクタピンの両端部(頭部及びショルダ部)を除く円柱状本体部外周部にガス及び残留異物逃げ通路としてスパイラル溝やトラバース溝を設け、合成樹脂射出成形が完了し形成された成形品を取り出すためのエジェクタプレートの移動と共に、エジェクタピンが該可動側型板から回動しないで該可動側入れ子Bの貫通孔B内を摺動して突き出すことにより、可動側入れ子Bの貫通孔B内に付着する合成樹脂の残留異物が除去でき、エジェクタピンの固着、折れ曲がり等の弊害が防止又は減少するという効果を奏する。   Molded product that is formed after the plastic resin injection molding is completed by providing spiral grooves and traverse grooves as gas and residual foreign material escape passages on the outer periphery of the cylindrical body excluding both ends (head and shoulder) of the conventional ejector pin Along with the movement of the ejector plate for taking out the ejector pin, the ejector pin does not rotate from the movable side mold plate and slides and protrudes through the through hole B of the movable side insert B, whereby the through hole B of the movable side insert B Residual foreign matter of the synthetic resin adhering to the inside can be removed, and the effects such as sticking of the ejector pin and bending can be prevented or reduced.

エジェクタピンの固着、折れ曲がり等の弊害を防止又は減少するという目的を、従来のエジェクタピンの形状等の大きな変更を伴わずに実現した。   The purpose of preventing or reducing the adverse effects such as sticking and bending of the ejector pin has been realized without major changes in the shape of the conventional ejector pin.

図1は、従来のエジェクタピン30の動作説明図である。図1(a)は形成された成形品60のエジェクト前の図であり、図1(b)は形成された成形品60のエジェクト後の図である。
図2は、本発明の一実施例のエジェクタピン70の動作説明図である。図2(a)は形成された成形品60のエジェクト前の図であり、図2(b)は形成された成形品60のエジェクト後の図である。
図3は、本発明のエジェクタピン70及び80の正面図である。図3(a)は円柱状本体部72外周部にスパイラル溝74を設けた本発明の一実施例のエジェクタピン70の正面図であり、図3(b)は円柱状本体部82外周部にトラバース溝84を設けた本発明の他実施例のエジェクタピン80の正面図である。
FIG. 1 is an operation explanatory view of a conventional ejector pin 30. FIG. 1A is a diagram before the formed molded product 60 is ejected, and FIG. 1B is a diagram after the molded product 60 is ejected.
FIG. 2 is a diagram for explaining the operation of the ejector pin 70 according to the embodiment of the present invention. 2A is a diagram before the formed molded product 60 is ejected, and FIG. 2B is a diagram after the molded product 60 is ejected.
FIG. 3 is a front view of the ejector pins 70 and 80 of the present invention. FIG. 3A is a front view of an ejector pin 70 according to an embodiment of the present invention in which a spiral groove 74 is provided on the outer peripheral portion of the cylindrical main body 72, and FIG. It is a front view of the ejector pin 80 of the other Example of this invention which provided the traverse groove | channel 84. FIG.

先ず、従来のエジェクタピン30が取り付けられる割型式金型(不図示)について、要部のみを説明する。
不図示ではあるが、割型式金型の固定側ユニットは、表面部に固定側入れ子を有する固定側型板と、該固定側型板の裏面部側に配設される固定側取付板と、からなる。
割型式金型の可動側ユニット50は、表面部に可動側入れ子A(不図示)及び/又は貫通孔B(不図示)を有する可動側入れ子B41を有し該貫通孔Bに連通する貫通孔A(不図示)を有する可動側型板40と、一端部である頭部31(形成された成形品60を可動側入れ子B41から突出す部分)と他端部であるショルダ部33と円柱状本体部32とからなり該可動側型板40の貫通孔A内と該可動側入れ子B41の貫通孔B内とを摺動するように挿入されるエジェクタピン30と、該可動側型板40の裏面部側に配設され外力(不図示ではあるが、通常は成形機本体に設けられた成形品突出機構の往復動との連動)により往復動ができ表面部に該エジェクタピン30のショルダ部33が固定できるエジェクタプレート20(実際にはエジェクタプレートA21とエジェクタプレートB22とで該ショルダ部33を挟着する)と、該エジェクタプレート20の裏面部側に配設される可動側取付板10と、からなる。
前記割型式金型に、従来のエジェクタピン30を使用し、合成樹脂射出成形の成形工程を繰り返していると、該可動側入れ子B41の貫通孔B内には徐々に合成樹脂の残留異物が付着し、該可動側型板40の貫通孔A内と、該可動側入れ子B41の貫通孔B内と、該貫通孔A内と該貫通孔B内とを摺動する該エジェクタピン30の頭部31や一部の円柱状本体部32と、が固着し、該エジェクタプレート20が移動する時に、該エジェクタピン30が折れ曲がる弊害(障害)が発生する。
First, only the main part of the split mold (not shown) to which the conventional ejector pin 30 is attached will be described.
Although not shown, the fixed-side unit of the split mold has a fixed-side mold plate having a fixed-side insert on the surface portion, a fixed-side mounting plate disposed on the back surface side of the fixed-side mold plate, Consists of.
The split mold type movable side unit 50 has a movable side insert B41 having a movable side insert A (not shown) and / or a through hole B (not shown) on the surface portion, and a through hole communicating with the through hole B. A movable side template 40 having A (not shown), a head portion 31 that is one end portion (a portion that projects the formed molded product 60 from the movable side insert B41), a shoulder portion 33 that is the other end portion, and a cylindrical shape. The ejector pin 30 which is formed by the main body 32 and is slidably inserted in the through hole A of the movable side template 40 and the through hole B of the movable side insert B41, and the movable side template 40 A shoulder portion of the ejector pin 30 on the front surface portion can be reciprocated by an external force (not shown, but normally linked with a reciprocating motion of a molded product protruding mechanism provided in the molding machine main body) disposed on the back surface side. Ejector plate 20 to which 33 can be fixed (actually the edge And Kuta plate A21 and the ejector plate B22 and in that sandwiched the shoulder portion 33), a movable side mounting plate 10 disposed on the back side of the ejector plate 20, made of.
When the conventional ejector pin 30 is used for the split mold and the molding process of the synthetic resin injection molding is repeated, the residual foreign matter of the synthetic resin gradually adheres in the through hole B of the movable side insert B41. The head of the ejector pin 30 that slides in the through hole A of the movable side template 40, in the through hole B of the movable side insert B41, and in the through hole A and the through hole B. When 31 and a part of the columnar main body 32 are fixed and the ejector plate 20 moves, a problem (failure) occurs in which the ejector pin 30 is bent.

そこで、従来のエジェクタピン30と置換できる本発明の一実施例のエジェクタピン70は、両端部(頭部71及びショルダ部73)を除く円柱状本体部72外周部にガス及び残留異物逃げ通路としてスパイラル溝74を設けた。
該エジェクタピン70の頭部71は、形成された成形品60を可動側入れ子B41から突出す部分ではあるが、合成樹脂射出成形時においては、該可動側入れ子B41の貫通孔Bを閉塞(気密、シール)する機能があるので、スパイラル溝74を設けてはならない。
また、該エジェクタピン70の円柱状本体部72外周部に設けたスパイラル溝74は、該円柱状本体部72外周部の一部でも全部でも良い。
Therefore, an ejector pin 70 according to an embodiment of the present invention that can replace the conventional ejector pin 30 is provided as a gas and residual foreign substance escape passage in the outer periphery of the cylindrical main body 72 excluding both ends (the head 71 and the shoulder 73). A spiral groove 74 was provided.
The head 71 of the ejector pin 70 is a portion that projects the formed molded product 60 from the movable side insert B41. However, during the synthetic resin injection molding, the through hole B of the movable side insert B41 is blocked (airtight). ), The spiral groove 74 should not be provided.
Further, the spiral groove 74 provided on the outer peripheral part of the cylindrical main body 72 of the ejector pin 70 may be a part or the whole of the outer peripheral part of the cylindrical main body 72.

該エジェクタピン70のスパイラル溝74は、可動側入れ子B41に存在(集結)するガスを逃す通路と、該可動側入れ子B41の貫通孔Bと該エジェクタピン70の頭部71との隙間(間隙)に存在する残留異物を逃す通路と、を兼ねているが、個別に説明する。   The spiral groove 74 of the ejector pin 70 is a gap (gap) between the passage for releasing the gas existing (concentrated) in the movable side insert B41 and the through hole B of the movable side insert B41 and the head 71 of the ejector pin 70. It also serves as a passage for escaping the residual foreign matter present in FIG.

ガスについては、可動側入れ子B41以外にも可動側入れ子Aに存在する可能性が有り、可動側入れ子Aやキャビティ内に存在するガスについては、別途ガスを逃す通路を設けるが、本発明の明細においては割愛する。
キャビティ内に溶けた合成樹脂を充填する際に、通常は真空引きを実施しておくが、キャビティ内の気密性にもよるが多少は残留する空気が有り、また溶けた合成樹脂がキャビティ内に充填される時に溶けた合成樹脂から発生する気体が有り、これらをガスと呼ぶが、溶けた合成樹脂がキャビティ内に充填されると、キャビティ内に浮游するガスは圧縮されて、溶けた合成樹脂がキャビティ内の細部まで充填されるのを阻止する。
この充填阻止を防止する(ガスを逃す)ためには、例えば、溶けた合成樹脂がキャビティ内に充填される寸前まで、該エジェクタピン70の頭部71を可動側入れ子B41から僅かでも突出しをしておき、溶けた合成樹脂の充填と同時に所定位置まで引き戻すようにすると良い。
The gas may exist in the movable side insert A in addition to the movable side insert B41, and the gas existing in the movable side insert A and the cavity is provided with a separate gas escape passage. I will omit it.
When filling the melted synthetic resin in the cavity, evacuation is usually performed, but there is some residual air depending on the airtightness in the cavity, and the molten synthetic resin is in the cavity. There are gases that are generated from the molten synthetic resin when they are filled, and these are called gases, but when the molten synthetic resin is filled into the cavity, the gas that floats in the cavity is compressed and the molten synthetic resin Is prevented from filling to the details in the cavity.
In order to prevent this filling prevention (gas escape), for example, the head 71 of the ejector pin 70 is slightly protruded from the movable side insert B41 just before the melted synthetic resin is filled into the cavity. It is preferable to pull back to a predetermined position simultaneously with the filling of the melted synthetic resin.

該可動側入れ子B41の貫通孔B内に付着する合成樹脂の残留異物には、例えば、合成樹脂射出成形時において固化しなかった液状の樹脂成分(やに)及び/又は添加剤、炭化した樹脂成分、離型剤・剥離剤、該可動側入れ子B41の貫通孔Bと該エジェクタピン70の頭部71との隙間(間隙)に溶けた合成樹脂が流れ出て固化したもの(バリ)、塵埃、等が有る。
そして、該エジェクタピン70においては、合成樹脂射出成形が完了し形成された成形品60を取り出すための該エジェクタプレート20の移動と共に、該エジェクタピン70が該可動側型板40から回動(右回転又は左回転)しないで該可動側入れ子B41の貫通孔B内を摺動して突き出すことにより、特に該可動側入れ子B41の貫通孔B内に付着する合成樹脂の残留異物等が除去されるようにした。
除去と言っても、実際には該エジェクタピン70のスパイラル溝74内に合成樹脂の残留異物等が移動するだけである。よって、徐々に該スパイラル溝74内に溜まる合成樹脂の残留異物等を、定期的に清掃等のメンテナンスを実施する必要はある。
Examples of the residual foreign matter of the synthetic resin adhering in the through hole B of the movable side insert B41 include, for example, a liquid resin component and / or additive that has not been solidified during the synthetic resin injection molding, and a carbonized resin. Component, release agent / release agent, synthetic resin melted in the gap (gap) between the through hole B of the movable side insert B41 and the head 71 of the ejector pin 70 (burr), dust, Etc.
In the ejector pin 70, the ejector pin 70 is rotated (rightward) from the movable side mold plate 40 with the movement of the ejector plate 20 for taking out the molded product 60 formed after the synthetic resin injection molding is completed. By sliding and projecting through the through hole B of the movable side insert B41 without rotating or rotating counterclockwise), residual foreign matter or the like of the synthetic resin adhering in the through hole B of the movable side insert B41 is removed. I did it.
Even if it is said to be removed, in reality, the residual foreign matter or the like of the synthetic resin only moves into the spiral groove 74 of the ejector pin 70. Therefore, it is necessary to periodically perform maintenance such as cleaning of residual foreign substances and the like of the synthetic resin that gradually accumulate in the spiral groove 74.

或いは、従来のエジェクタピン30と置換できる本発明の他実施例のエジェクタピン80は、両端部(頭部81及びショルダ部83)を除く円柱状本体部82外周部にガス及び残留異物逃げ通路としてトラバース溝84を設け、合成樹脂射出成形が完了し形成された成形品60を取り出すための該エジェクタプレート20の移動と共に、該エジェクタピン80が該可動側型板40から回動しないで該可動側入れ子B41の貫通孔B内を摺動して突き出すことにより、特に該可動側入れ子B41の貫通孔B内に付着する合成樹脂の残留異物等が除去されるようにした。
該エジェクタピン80の頭部81は、形成された成形品60を可動側入れ子B41から突出す部分ではあるが、合成樹脂射出成形時においては、該可動側入れ子B41の貫通孔Bを閉塞(気密、シール)する機能があるので、トラバース溝84を設けてはならない。
また、該エジェクタピン80の円柱状本体部82外周部に設けたトラバース溝84は、該円柱状本体部82外周部の一部でも全部でも良い。
Alternatively, an ejector pin 80 according to another embodiment of the present invention that can replace the conventional ejector pin 30 is used as a gas and residual foreign material escape passage in the outer peripheral portion of the cylindrical main body 82 excluding both end portions (head portion 81 and shoulder portion 83). A traverse groove 84 is provided, and the ejector pin 80 does not rotate from the movable side mold plate 40 along with the movement of the ejector plate 20 to take out the molded product 60 formed after the synthetic resin injection molding is completed. By sliding and projecting through the through hole B of the insert B41, the residual foreign matter or the like of the synthetic resin adhering in the through hole B of the movable insert N41 is removed.
The head 81 of the ejector pin 80 is a portion that projects the formed product 60 from the movable side insert B41. However, during the synthetic resin injection molding, the through hole B of the movable side insert B41 is blocked (airtight). , The traverse groove 84 should not be provided.
Further, the traverse groove 84 provided on the outer peripheral portion of the cylindrical main body portion 82 of the ejector pin 80 may be a part or the whole of the outer peripheral portion of the cylindrical main body portion 82.

以上、本発明の好適な実施の形態について述べてきたが、本発明は上述する実施の形態に限定されるものでなく、発明の精神を逸脱しない範囲で多くの改変等を施し得るのはもちろんである。   The preferred embodiments of the present invention have been described above. However, the present invention is not limited to the above-described embodiments, and it goes without saying that many modifications and the like can be made without departing from the spirit of the invention. It is.

例えば、スパイラル溝74やトラバース溝84のような凹形状がはっきりした螺旋溝でなく、ギザギザ形状の螺子溝でも良い。
また、形成される成形品60の形状・寸法、割型式金型の形状・寸法等により、若干ではあるが、可動側入れ子B41の貫通孔B内に付着する合成樹脂の残留異物の除去出来る量等が異なる場合があるので、本発明の実施例の詳細ではふれなかったが、螺旋溝のリードやリード角を調整すると良い。(リードとは、螺子の蔓巻線に沿って軸の周りを1周するとき、軸方向に進む距離をいい、リード角とは、螺子の蔓巻線の接線が蔓巻線の軸に垂直な面となす角度をいう。)
切削工具のリーマのような複数の縦溝(スリット)としても良いが、可動側入れ子B41の貫通孔B内に付着する合成樹脂の残留異物を除去できない部分が残ることが確認されているので、縦溝と螺旋溝とを組合せた溝とすると良い。
For example, not a spiral groove with a clear concave shape such as the spiral groove 74 or the traverse groove 84 but a jagged screw groove may be used.
Further, the amount of residual foreign matter of the synthetic resin adhering in the through-hole B of the movable side insert B41 is slight, depending on the shape / size of the formed product 60 and the shape / size of the split mold. However, the details of the embodiments of the present invention were not mentioned in detail, but it is preferable to adjust the lead and the lead angle of the spiral groove. (Lead is the distance traveled in the axial direction when making one round around the axis along the vine winding of the screw. Lead angle is the tangent of the vine winding of the screw perpendicular to the axis of the vine winding. This is the angle between the surface and the surface.)
Although it may be a plurality of vertical grooves (slits) like a reamer of a cutting tool, it has been confirmed that there remains a portion that cannot remove the residual foreign matter of the synthetic resin adhering in the through hole B of the movable side insert B41. It is preferable that the groove is a combination of a longitudinal groove and a spiral groove.

割型式金型の可動側ユニット50の可動側型板40に設けられた可動側入れ子B41内を摺動するエジェクタピン30について、本発明のエジェクタピン70又は80と置換したが、例えば、可動側型板40に直接設けられるエジェクタピン、ガス抜きロッド(棒)等についても適用できる。   The ejector pin 30 sliding in the movable side insert B41 provided on the movable side mold plate 40 of the movable mold unit 50 of the split mold is replaced with the ejector pin 70 or 80 of the present invention. The present invention can also be applied to ejector pins, degassing rods (rods) and the like provided directly on the template 40.

従来のエジェクタピンの動作説明図である。It is operation | movement explanatory drawing of the conventional ejector pin. 本発明の一実施例のエジェクタピンの動作説明図である。It is operation | movement explanatory drawing of the ejector pin of one Example of this invention. 本発明のエジェクタピンの正面図である。It is a front view of the ejector pin of this invention.

符号の説明Explanation of symbols

10…可動側取付板、20…エジェクタプレート、21…エジェクタプレートA、22…エジェクタプレートB、30…従来のエジェクタピン、31…頭部、32…円柱状本体部、33…ショルダ部、40…可動側型板、41…可動側入れ子B、50…可動側ユニット、60…形成された成形品、70…本発明の一実施例のエジェクタピン、71…頭部、72…円柱状本体部、73…ショルダ部、74…スパイラル溝、80…本発明の他実施例のエジェクタピン、81…頭部、82…円柱状本体部、83…ショルダ部、84…トラバース溝   DESCRIPTION OF SYMBOLS 10 ... Movable side mounting plate, 20 ... Ejector plate, 21 ... Ejector plate A, 22 ... Ejector plate B, 30 ... Conventional ejector pin, 31 ... Head, 32 ... Cylindrical main-body part, 33 ... Shoulder part, 40 ... Movable side template, 41 ... Movable side insert B, 50 ... Movable side unit, 60 ... Molded product formed, 70 ... Ejector pin of one embodiment of the present invention, 71 ... Head, 72 ... Columnar main body, 73 ... Shoulder portion, 74 ... spiral groove, 80 ... ejector pin of another embodiment of the present invention, 81 ... head, 82 ... cylindrical body portion, 83 ... shoulder portion, 84 ... traverse groove

Claims (2)

表面部に固定側入れ子を有する固定側型板と、該固定側型板の裏面部側に配設される固定側取付板と、からなる固定側ユニットと、
表面部に可動側入れ子A及び/又は貫通孔Bを有する可動側入れ子Bを有し該貫通孔Bに連通する貫通孔Aを有する可動側型板と、一端部である頭部と他端部であるショルダ部と円柱状本体部とからなり該可動側型板の貫通孔A内と該可動側入れ子Bの貫通孔B内とを摺動するように挿入されるエジェクタピンと、該可動側型板の裏面部側に配設され外力により往復動ができ表面部に該エジェクタピンのショルダ部が固定できるエジェクタプレートと、該エジェクタプレートの裏面部側に配設される可動側取付板と、からなる可動側ユニットと、
からなり、該固定側型板の表面部と該可動側型板の表面部とを合わせることにより、内部空間であるキャビティを形成する割型式金型において、
該エジェクタピンの両端部を除く円柱状本体部外周部にガス及び残留異物逃げ通路としてスパイラル溝を設け、合成樹脂射出成形が完了し形成された成形品を取り出すための該エジェクタプレートの移動と共に、該エジェクタピンが該可動側型板から回動しないで該可動側入れ子Bの貫通孔B内を摺動して突き出すことにより、該可動側入れ子Bの貫通孔B内に付着する合成樹脂の残留異物が除去されることを特徴とする合成樹脂射出成形用割型式金型のエジェクタピン。
A fixed-side unit comprising a fixed-side mold plate having a fixed-side insert on the surface portion, and a fixed-side mounting plate disposed on the back surface side of the fixed-side mold plate,
A movable side mold B having a movable side insert A and / or a through hole B on the surface portion and having a through hole A communicating with the through hole B, a head and one end as one end An ejector pin that is inserted into the through-hole A of the movable-side mold plate and the through-hole B of the movable-side insert B, and the movable-side mold. An ejector plate disposed on the back surface side of the plate and capable of reciprocating by an external force and capable of fixing the shoulder portion of the ejector pin to the front surface portion; and a movable side mounting plate disposed on the back surface side of the ejector plate. A movable side unit,
In a split mold that forms a cavity that is an internal space by combining the surface portion of the fixed mold plate and the surface portion of the movable mold plate,
A spiral groove is provided as a gas and residual foreign material escape passage in the outer peripheral portion of the cylindrical main body excluding both ends of the ejector pin, and along with the movement of the ejector plate for taking out the molded product formed after the synthetic resin injection molding, The ejector pin does not rotate from the movable side mold plate and slides and protrudes through the through hole B of the movable side insert B, so that the synthetic resin adhering in the through hole B of the movable side insert B remains. An ejector pin of a split mold for synthetic resin injection molding, wherein foreign matter is removed.
表面部に固定側入れ子を有する固定側型板と、該固定側型板の裏面部側に配設される固定側取付板と、からなる固定側ユニットと、
表面部に可動側入れ子A及び/又は貫通孔Bを有する可動側入れ子Bを有し該貫通孔Bに連通する貫通孔Aを有する可動側型板と、一端部である頭部と他端部であるショルダ部と円柱状本体部とからなり該可動側型板の貫通孔A内と該可動側入れ子Bの貫通孔B内とを摺動するように挿入されるエジェクタピンと、該可動側型板の裏面部側に配設され外力により往復動ができ表面部に該エジェクタピンのショルダ部が固定できるエジェクタプレートと、該エジェクタプレートの裏面部側に配設される可動側取付板と、からなる可動側ユニットと、
からなり、該固定側型板の表面部と該可動側型板の表面部とを合わせることにより、内部空間であるキャビティを形成する割型式金型において、
該エジェクタピンの両端部を除く円柱状本体部外周部にガス及び残留異物逃げ通路としてトラバース溝を設け、合成樹脂射出成形が完了し形成された成形品を取り出すための該エジェクタプレートの移動と共に、該エジェクタピンが該可動側型板から回動しないで該可動側入れ子Bの貫通孔B内を摺動して突き出すことにより、該可動側入れ子Bの貫通孔B内に付着する合成樹脂の残留異物が除去されることを特徴とする合成樹脂射出成形用割型式金型のエジェクタピン。
A fixed-side unit comprising a fixed-side mold plate having a fixed-side insert on the surface portion, and a fixed-side mounting plate disposed on the back surface side of the fixed-side mold plate,
A movable side mold B having a movable side insert A and / or a through hole B on the surface portion and having a through hole A communicating with the through hole B, a head and one end as one end An ejector pin that is inserted into the through-hole A of the movable-side mold plate and the through-hole B of the movable-side insert B, and the movable-side mold. An ejector plate disposed on the back surface side of the plate and capable of reciprocating by an external force and capable of fixing the shoulder portion of the ejector pin to the front surface portion; and a movable side mounting plate disposed on the back surface side of the ejector plate. A movable side unit,
In a split mold that forms a cavity that is an internal space by combining the surface portion of the fixed mold plate and the surface portion of the movable mold plate,
A traverse groove is provided as a gas and residual foreign material escape passage in the outer peripheral portion of the cylindrical main body excluding both ends of the ejector pin, and along with the movement of the ejector plate for taking out a molded product formed after the synthetic resin injection molding, The ejector pin does not rotate from the movable side mold plate and slides and protrudes through the through hole B of the movable side insert B, so that the synthetic resin adhering in the through hole B of the movable side insert B remains. An ejector pin of a split mold for synthetic resin injection molding, wherein foreign matter is removed.
JP2004285977A 2004-09-30 2004-09-30 Ejector pin of split mold for synthetic resin injection molding Pending JP2006095922A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009178916A (en) * 2008-01-30 2009-08-13 Daiichi Seiko Kk Mold for forming resin
CN104723515A (en) * 2013-12-20 2015-06-24 汉达精密电子(昆山)有限公司 Mould ejector pin structure
KR20180024413A (en) * 2016-08-30 2018-03-08 (주)디팜스테크 Ejecting pin of injection molding
JP7500419B2 (en) 2020-12-25 2024-06-17 住友重機械工業株式会社 Adhesion detection device

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009178916A (en) * 2008-01-30 2009-08-13 Daiichi Seiko Kk Mold for forming resin
JP4659050B2 (en) * 2008-01-30 2011-03-30 第一精工株式会社 Mold for resin molding
CN104723515A (en) * 2013-12-20 2015-06-24 汉达精密电子(昆山)有限公司 Mould ejector pin structure
KR20180024413A (en) * 2016-08-30 2018-03-08 (주)디팜스테크 Ejecting pin of injection molding
KR101893821B1 (en) * 2016-08-30 2018-08-31 (주)디팜스테크 Ejecting pin of injection molding
JP7500419B2 (en) 2020-12-25 2024-06-17 住友重機械工業株式会社 Adhesion detection device

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