JP2022040979A - Injection mold and injection molding method - Google Patents

Injection mold and injection molding method Download PDF

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JP2022040979A
JP2022040979A JP2020145962A JP2020145962A JP2022040979A JP 2022040979 A JP2022040979 A JP 2022040979A JP 2020145962 A JP2020145962 A JP 2020145962A JP 2020145962 A JP2020145962 A JP 2020145962A JP 2022040979 A JP2022040979 A JP 2022040979A
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mold
injection molding
nests
molding die
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勇貴 三沢
Yuki Misawa
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Hitachi Industrial Equipment Systems Co Ltd
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Abstract

To provide an injection mold that can mold without causing sticking to a cavity in cases where it is difficult to provide a draft slope in a fixed side mold.SOLUTION: In an injection molding mold consisting of a fixed side mold and a movable side mold for injection molding resin, the fixed side mold includes: a fixed side piece with multiple nests stacked in a movable manner; and a pressing structure that presses and secures the stacked nests by following mold clamping operation, and releases the pressure of the stacked nests by following mold opening operation to enable them to move.SELECTED DRAWING: Figure 2

Description

本発明は、成形不良の原因となるキャビ取られを防止する射出成形金型および射出成形方法に関する。 The present invention relates to an injection molding die and an injection molding method for preventing mold removal which causes molding defects.

金型を用いる射出成形においては、通常、成形後に金型を開いた時には成形品は可動側（コア側、雄型側）に付いており、取り出し機が成形品を掴んだ後、突き出しピンで成形品を押し出すことで、成形品が取り出し機によって取り出される。しかし、固定側（キャビティ側、雌型側）の離型抵抗が大きい場合には、成形品の突き出し構造のない固定側に成形品が残ってしまい、成形品の取り出しが困難となる。この、金型が開いても成形品が固定側（キャビティ側）に張り付くことを「キャビ取られ」という。キャビ取られを防ぐ一般的な対策として、離型抵抗の大きい形状を可動側（コア側）に持たせる方法と、固定側（キャビティ側）の形状に抜き勾配を設ける方法がある。 In injection molding using a mold, the molded product is usually attached to the movable side (core side, male mold side) when the mold is opened after molding, and after the take-out machine grabs the molded product, a protrusion pin is used. By extruding the molded product, the molded product is taken out by the take-out machine. However, when the mold release resistance on the fixed side (cavity side, female mold side) is large, the molded product remains on the fixed side where the molded product does not have a protruding structure, and it becomes difficult to take out the molded product. Even if the mold is opened, the molded product sticks to the fixed side (cavity side), which is called "cavity removal". As a general measure to prevent mold removal, there are a method of having a shape having a large mold release resistance on the movable side (core side) and a method of providing a draft in the shape of the fixed side (cavity side).

特許文献１には、成形品が固定側金型のコアに張り付くことがないように、抜き勾配を有する射出成形用金型が開示されている。 Patent Document 1 discloses an injection molding die having a draft so that the molded product does not stick to the core of the fixed side die.

特開２００８－１２６４４６号公報Japanese Unexamined Patent Publication No. 2008-126446

固定側（キャビティ側）の離型抵抗が大きい金型において、金型のキャビ取られを防ぐために、固定側の形状にかかる離型抵抗を小さくすることが望まれる。しかし、成形品の形状や仕様により、可動側に離型抵抗の大きい形状を持たせることや、固定側の形状に抜き勾配の設定が困難な場合がある。 In a mold having a large mold release resistance on the fixed side (cavity side), it is desired to reduce the mold release resistance applied to the shape on the fixed side in order to prevent the mold from removing the mold. However, depending on the shape and specifications of the molded product, it may be difficult to provide a shape with a large mold release resistance on the movable side or to set a draft on the fixed side.

特許文献１には、固定側金型に抜き勾配を設けることにより成形品の張り付きを防止する射出成形用金型が開示されているが、抜き勾配の設定が困難な場合に張り付きを防ぐことは、考慮されていない。 Patent Document 1 discloses an injection molding die that prevents sticking of a molded product by providing a draft on the fixed-side mold, but it is possible to prevent sticking when it is difficult to set the draft. , Not considered.

本発明は、固定側金型に抜き勾配の設定が困難な場合において、キャビ取られを発生させずに成形可能な射出成形金型を提供することを目的とする。 An object of the present invention is to provide an injection molding die that can be molded without causing mold removal when it is difficult to set a draft on the fixed side die.

前記課題を解決するため、本発明の射出成形金型は、固定側駒を構成する複数の入れ子を、成形品の抜け方向に対して垂直方向に可動する構造を設け、離型時に、入れ子と成形品の間にクリアランスを作り、離型抵抗を小さくすることで、キャビ取られを防止する。 In order to solve the above-mentioned problems, the injection molding die of the present invention is provided with a structure in which a plurality of nests constituting the fixed side piece can be moved in a direction perpendicular to the withdrawal direction of the molded product. By creating a clearance between the molded products and reducing the mold release resistance, it is possible to prevent mold removal.

本発明の「射出成形金型」の一例を挙げるならば、
固定側金型と可動側金型から構成され、樹脂を射出成形する射出成形金型であって、
前記固定側金型は、
複数の入れ子を移動可能に重ねた固定側駒と、
型締め動作に追従して、前記重ねた入れ子を押圧して固定し、型開き動作に追従して、前記重ねた入れ子の押圧を開放して移動可能とする押圧構造と、
を備えるものである。 To give an example of the "injection molding die" of the present invention,
It is an injection molding die that consists of a fixed side mold and a movable side mold and injects resin.
The fixed side mold is
Fixed side pieces with multiple nests stacked on top of each other so that they can be moved
A pressing structure that follows the mold clamping operation and presses and fixes the stacked nests, and follows the mold opening operation to release the pressing of the stacked nests so that they can move.
It is equipped with.

本発明によれば、固定側金型に抜き勾配を設けることが困難な場合において、キャビ取られを発生させずに成形可能な射出成形金型を提供することができる。 According to the present invention, it is possible to provide an injection molding die that can be molded without causing mold removal when it is difficult to provide a draft on the fixed side die.

上記した以外の課題、構成および効果は、以下の実施形態の説明により明らかにされる。 Issues, configurations and effects other than those described above will be clarified by the description of the following embodiments.

本発明の射出成形金型の全体図である。It is an whole view of the injection molding die of this invention. 本発明の射出成形金型の型開き時を示す図である。It is a figure which shows the mold opening time of the injection molding die of this invention. 本発明の射出成形金型の型開き時の部分拡大図である。It is a partially enlarged view at the time of mold opening of the injection molding die of this invention. 本発明の射出成形金型の型締め時を示す図である。It is a figure which shows the time of molding the injection molding die of this invention. 本発明の射出成形金型の型締め時の部分拡大図である。It is a partially enlarged view at the time of mold clamping of the injection molding die of this invention. 本発明の射出成形金型の入れ子の一例を示す図である。It is a figure which shows an example of the nesting of the injection molding die of this invention. 本発明の射出成形金型による成形品の一例を示す図である。It is a figure which shows an example of the molded article by the injection molding die of this invention.

本発明の実施例について、図面を用いて説明する。ただし、本発明は以下に示す実施例の記載内容に限定して解釈されるものではない。本発明の思想ないし主旨から逸脱しない範囲で、その具体的構成を変更し得ることは当業者であれば容易に理解される。 Examples of the present invention will be described with reference to the drawings. However, the present invention is not limited to the description of the examples shown below. It is easily understood by those skilled in the art that a specific configuration thereof can be changed without departing from the idea or gist of the present invention.

図１に、本発明の射出成形金型の一例の全体図を示す。 FIG. 1 shows an overall view of an example of an injection molding die of the present invention.

射出成形金型は、固定側金型１０と、固定側金型１０に対して上下に移動する可動側金型２０とで構成されている。固定側金型１０には、複数の入れ子（入れ駒）１４を重ね、その両側に外側駒１５を配置して固定側駒１２を構成している。外側駒１５の外側には、ロッキングブロック１６が上下方向に移動可能に設けられており、ロッキングブロック１６はボルト１８により下方に落ちないように支持されている。可動側金型２０には、可動側駒２２が設けられ、可動側駒２２の凹部に固定側駒１２が嵌まり合うように構成されている。可動側駒２２と固定側駒１２との間に、樹脂を注入して成形品を成形するキャビティ（成形室）が構成される。可動側金型２０には、突き出し板２７に取り付けた複数の突き出しピン２６を備えており、射出成形して型開き後に突き出しピン２６を上方に突き出すことにより、成形品を取り出すことができる。符号２４は、ロッキングブロック１６に設けた孔部と嵌まり合うパーティングロックである。 The injection-molded mold is composed of a fixed-side mold 10 and a movable-side mold 20 that moves up and down with respect to the fixed-side mold 10. A plurality of nests (nesting pieces) 14 are stacked on the fixed-side mold 10, and outer pieces 15 are arranged on both sides thereof to form the fixed-side piece 12. A locking block 16 is provided on the outside of the outer piece 15 so as to be movable in the vertical direction, and the locking block 16 is supported by bolts 18 so as not to fall downward. The movable side mold 20 is provided with the movable side piece 22, and is configured so that the fixed side piece 12 fits into the recess of the movable side piece 22. A cavity (molding chamber) for injecting resin and molding a molded product is formed between the movable side piece 22 and the fixed side piece 12. The movable mold 20 is provided with a plurality of protrusion pins 26 attached to the protrusion plate 27, and the molded product can be taken out by injection molding and ejecting the protrusion pins 26 upward after opening the mold. Reference numeral 24 is a parting lock that fits into the hole provided in the locking block 16.

図７に、本発明の射出成形金型で成形する成形品の一例を示す。図７は、図１の金型全体図で成形した成形品を、立てた状態を示す図である。図に示すように、例えば一定幅の凹部或いは一定幅の凸部を複数備える成形品では、固定側の形状に抜き勾配の設定が困難である。なお、本発明の射出成形金型で成形する成形品は、図７の形状に限られるものではない。 FIG. 7 shows an example of a molded product molded by the injection molding die of the present invention. FIG. 7 is a diagram showing a state in which the molded product molded in the overall view of the mold of FIG. 1 is upright. As shown in the figure, for example, in a molded product having a plurality of concave portions having a constant width or convex portions having a constant width, it is difficult to set a draft for the shape on the fixed side. The molded product molded by the injection molding die of the present invention is not limited to the shape shown in FIG. 7.

図６に、図７の成形品を成形するための、１つの入れ子（入れ駒）１４を示す。入れ子１４は、基部１４ａと、成形品３０の凹部を形成する一定幅の凸部１４ｂと、入れ子が下方に落ちることを防止するための係合部１４ｃを有している。係合部１４ｃを固定側金型１０に形成した溝部などに嵌め合わせることで、複数の入れ子が落ちることなく支持することができる。本発明では、図６に示す複数の入れ子１４を重ねて、固定側駒１２を構成する。なお、入れ子１４の形状は成形する成形品に応じて適宜改変するもので、図６の形状に限られるものではない。 FIG. 6 shows one nest 14 for molding the molded product of FIG. 7. The nest 14 has a base portion 14a, a convex portion 14b having a constant width forming a concave portion of the molded product 30, and an engaging portion 14c for preventing the nest from falling downward. By fitting the engaging portion 14c into a groove portion or the like formed in the fixed-side mold 10, a plurality of nests can be supported without falling. In the present invention, the plurality of nests 14 shown in FIG. 6 are stacked to form the fixed side piece 12. The shape of the nest 14 is appropriately modified according to the molded product to be molded, and is not limited to the shape shown in FIG.

図２に本発明の射出成形金型の型開き時の構造図を示し、図３に複数の入れ子の先端部分の部分拡大図を示す。固定側金型１０は、複数の入れ子１４を重ね、その両側に外側駒１５を配置した固定側駒１２を備えている。複数の入れ子１４と外側駒１５は、図の横方向に移動可能に構成されている。外側駒１５の外側壁は傾斜面を備えており、外側駒１５の外側には、くさび形状のロッキングブロック１６が嵌め込まれている。図２に示すように、型開き時には、矢印に示すように、ロッキングブロック１６が下方に移動して、両側の外側駒１５が左右に開いており、図３の拡大図に示すように、複数の入れ子１４のそれぞれの間にクリアランスができている。 FIG. 2 shows a structural diagram of the injection molding die of the present invention when the mold is opened, and FIG. 3 shows a partially enlarged view of the tip portions of a plurality of nests. The fixed-side mold 10 includes a fixed-side piece 12 in which a plurality of nests 14 are stacked and outer pieces 15 are arranged on both sides thereof. The plurality of nests 14 and the outer piece 15 are configured to be movable in the horizontal direction in the figure. The outer wall of the outer piece 15 has an inclined surface, and a wedge-shaped locking block 16 is fitted on the outside of the outer piece 15. As shown in FIG. 2, at the time of mold opening, the locking block 16 moves downward as shown by the arrow, and the outer pieces 15 on both sides are opened to the left and right. There is a clearance between each of the nests 14.

図４に本発明の射出成形金型の型締め時の構造図を示し、図５に複数の入れ子の先端部分の部分拡大図を示す。可動側金型２０を上方に移動すると、可動側金型２０により押圧されてロッキングブロック１６が上方に移動する。そして、ロッキングブロック１６のくさび形状と外側駒１５の傾斜壁によって外側駒１５が成形品の抜け方向（下方向）に対して垂直方向に移動し、複数の入れ子１４を両側から押圧する。そして、図５に示すように、複数の入れ子１４の間のクリアランスが閉じた固定した状態となる。 FIG. 4 shows a structural diagram of the injection molding die of the present invention at the time of mold clamping, and FIG. 5 shows a partially enlarged view of the tip portions of a plurality of nests. When the movable side mold 20 is moved upward, the locking block 16 is pressed by the movable side mold 20 and moves upward. Then, the wedge shape of the locking block 16 and the inclined wall of the outer piece 15 move the outer piece 15 in the direction perpendicular to the removing direction (downward) of the molded product, and press the plurality of nests 14 from both sides. Then, as shown in FIG. 5, the clearance between the plurality of nests 14 is closed and fixed.

型締め状態で図示していない樹脂注入口から成形樹脂を流し込むと、それぞれの入れ子１４の間に成形圧がかかり、入れ子１４に外に押し広げる力が加わる。 When the molding resin is poured from the resin injection port (not shown) in the mold-clamped state, molding pressure is applied between the nests 14 and a force for pushing the molding resin outward is applied to the nests 14.

樹脂成形後に成形品を取り出すときは、図２に示すように、可動側金型２０が固定側金型から離れる方向（下方）に移動し、型開きの動作を利用し、パーティングロック２４によって、ロッキングブロック１６を引っ掛けてロッキングブロック１６を下方に引っ張り出す。そして、成形圧により外に押し広げようとする力によって、入れ子と入れ子の間に、再度クリアランスが生まれ、入れ子１４にかかる成形型圧を開放することができる。これにより、離型時の抵抗を小さくし、成形品のキャビ取られを防止することができる。 When the molded product is taken out after resin molding, as shown in FIG. 2, the movable mold 20 moves in the direction away from the fixed mold (downward), and the mold opening operation is used by the parting lock 24. , The locking block 16 is hooked and the locking block 16 is pulled out downward. Then, the force of pushing outward by the molding pressure creates a clearance again between the nesting and the nesting, and the molding mold pressure applied to the nesting 14 can be released. As a result, the resistance at the time of mold release can be reduced, and the mold removal of the molded product can be prevented.

本実施例によれば、複数の入れ子を移動可能に重ねて固定側駒を構成し、型締め動作に追従して、重ねた入れ子を押圧して固定し、型開き動作に追従して、重ねた入れ子の押圧を開放して移動可能とする押圧構造を設けることで、型開き時に、入れ子と成形品の間にクリアランスをつくり、押圧力を開放することで離型抵抗を小さくし、キャビ取られを防止することができる。 According to this embodiment, a plurality of nests are movably stacked to form a fixed side piece, and the stacked nests are pressed and fixed according to the mold clamping operation, and the stacked nests are pressed and fixed, and the stacking operation is followed. By providing a pressing structure that releases the pressing of the nest and allows it to move, a clearance is created between the nest and the molded product when the mold is opened, and by releasing the pressing pressure, the mold release resistance is reduced and the mold is removed. It is possible to prevent the damage.

本発明の射出成形方法は、複数の入れ子を移動可能に重ねた固定側駒を有する固定側金型と、前記固定側金型に対して移動する可動側金型から構成される射出成形金型を用いる射出成形方法であって、型締め時に前記可動側金型を前記固定側金型側に移動して、前記重ねた入れ子を押圧して固定するステップと、前記固定側金型と前記可動側金型とで形成される、キャビティに樹脂を注入して硬化するステップと、型開き時に前記可動側金型を前記固定側金型から離れる方向に移動して、前記重ねた入れ子の押圧を開放して前記複数の入れ子を移動可能とし、入れ子と成型品の間にクリアランスをつくり、圧力を開放することで、離型抵抗を小さくするステップと、を備える樹脂成形方法である。 The injection molding method of the present invention is an injection molding die composed of a fixed side mold having a fixed side piece in which a plurality of nests are movably stacked and a movable side mold that moves with respect to the fixed side mold. This is an injection molding method using The step of injecting resin into the cavity formed by the side mold and hardening, and the movable side mold being moved in a direction away from the fixed side mold at the time of opening the mold to press the stacked nests. It is a resin molding method including a step of reducing the mold release resistance by opening the plurality of nests so that the plurality of nests can be moved, creating a clearance between the nest and the molded product, and releasing the pressure.

１０…固定側金型
１２…固定側駒
１４…固定側入れ子（入れ駒）
１５…外側駒
１６…ロッキングブロック
１８…ボルト
２０…可動側金型
２２…可動側駒
２４…パーティングロック
２６…突き出しピン
２７…突き出し板
３０…成形品 10 ... Fixed side mold 12 ... Fixed side piece 14 ... Fixed side nesting (nesting piece)
15 ... Outer piece 16 ... Locking block 18 ... Bolt 20 ... Movable side mold 22 ... Movable side piece 24 ... Parting lock 26 ... Protruding pin 27 ... Protruding plate 30 ... Molded product

Claims (8)

固定側金型と可動側金型から構成され、樹脂を射出成形する射出成形金型であって、
前記固定側金型は、
複数の入れ子を移動可能に重ねた固定側駒と、
型締め動作に追従して、前記重ねた入れ子を押圧して固定し、型開き動作に追従して、前記重ねた入れ子の押圧を開放して移動可能とする押圧構造と、
を備える射出成形金型。 It is an injection molding die that consists of a fixed side mold and a movable side mold and injects resin.
The fixed side mold is
Fixed side pieces with multiple nests stacked on top of each other so that they can be moved
A pressing structure that follows the mold clamping operation and presses and fixes the stacked nests, and follows the mold opening operation to release the pressing of the stacked nests so that they can move.
Injection molding mold equipped with. 請求項１に記載の射出成形金型において、
前記複数の入れ子の移動可能方向、および、前記押圧構造による、前記入れ子の押圧方向は、成形品の抜け方向に対して垂直方向であることを特徴とする射出成形金型。 In the injection molding die according to claim 1,
An injection molding die characterized in that the movable direction of the plurality of nests and the pressing direction of the nests according to the pressing structure are perpendicular to the withdrawal direction of the molded product. 請求項１に記載の射出成形金型において、
前記押圧構造は、
複数重ねた入れ子の外側に配置した、傾斜壁を有する外側駒と、
前記入れ子の移動可能方向に対して垂直方向に移動するくさび形状のロッキングブロックと、
で構成され、
前記外側駒の傾斜壁と前記ロッキングブロックのくさび形状とにより、前記重ねた複数の入れ子を押圧することを特徴とする射出成形金型。 In the injection molding die according to claim 1,
The pressing structure is
An outer piece with a sloping wall placed outside multiple nested nests,
A wedge-shaped locking block that moves perpendicular to the nested movable direction, and
Consists of
An injection molding die characterized in that a plurality of stacked nests are pressed by the inclined wall of the outer piece and the wedge shape of the locking block. 請求項３に記載の射出成形金型において、
前記可動側金型にパーティングロックを備え、
型開き動作時に、前記パーティングロックが前記ロッキングブロックを引き出すことを特徴とする射出成形金型。 In the injection molding die according to claim 3,
The movable side mold is equipped with a parting lock.
An injection molding die characterized in that the parting lock pulls out the locking block during the mold opening operation. 請求項１に記載の射出成形金型において、
前記入れ子は、樹脂を注入するキャビティ側に、一定幅の凸部を有することを特徴とする射出成形金型。 In the injection molding die according to claim 1,
The nesting is an injection molding die characterized by having a convex portion having a constant width on the cavity side into which the resin is injected. 複数の入れ子を移動可能に重ねた固定側駒を有する固定側金型と、前記固定側金型に対して移動する可動側金型から構成される射出成形金型を用いる射出成形方法であって、
型締め時に前記可動側金型を前記固定側金型側に移動して、前記重ねた複数の入れ子を押圧して固定するステップと、
前記固定側金型と前記可動側金型とで形成される、キャビティに樹脂を注入して硬化するステップと、
型開き時に前記可動側金型を前記固定側金型から離れる方向に移動して、前記重ねた複数の入れ子の押圧を開放して前記複数の入れ子を移動可能とし、入れ子と成型品の間にクリアランスをつくり、圧力を開放することで、離型抵抗を小さくするステップと、
を備える射出成形方法。 An injection molding method using an injection molding die composed of a fixed side mold having a fixed side piece in which a plurality of nests are movably stacked and a movable side mold that moves with respect to the fixed side mold. ,
A step of moving the movable mold to the fixed mold side at the time of mold clamping and pressing and fixing the plurality of stacked nests.
A step of injecting resin into a cavity and hardening, which is formed by the fixed-side mold and the movable-side mold, and
When the mold is opened, the movable mold is moved in a direction away from the fixed mold to release the pressure of the plurality of stacked nests so that the plurality of nests can be moved, and between the nest and the molded product. Steps to reduce mold release resistance by creating clearance and releasing pressure,
Injection molding method. 請求項６に記載の射出成形方法において、
前記複数の入れ子の移動可能方向、および、前記入れ子の押圧方向は、成形品の抜け方向に対して垂直方向であることを特徴とする射出成形方法。 In the injection molding method according to claim 6,
An injection molding method, characterized in that the movable direction of the plurality of nests and the pressing direction of the nests are perpendicular to the withdrawal direction of the molded product. 請求項６に記載の射出成形方法において、
前記入れ子は、樹脂を注入するキャビティ側に、一定幅の凸部を有することを特徴とする射出成形方法。 In the injection molding method according to claim 6,
The nesting is an injection molding method characterized by having a convex portion having a constant width on the cavity side into which the resin is injected.
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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5638212A (en) * 1979-09-06 1981-04-13 Furukawa Battery Co Ltd:The Die for battery jar of monoblock type
JPH0412816A (en) * 1990-04-28 1992-01-17 S K Koki:Kk Molding process and its device
JPH07178782A (en) * 1993-12-22 1995-07-18 Mitsubishi Heavy Ind Ltd Injection compression mold

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5638212A (en) * 1979-09-06 1981-04-13 Furukawa Battery Co Ltd:The Die for battery jar of monoblock type
JPH0412816A (en) * 1990-04-28 1992-01-17 S K Koki:Kk Molding process and its device
JPH07178782A (en) * 1993-12-22 1995-07-18 Mitsubishi Heavy Ind Ltd Injection compression mold

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