JP6270493B2 - Gate cutting device for injection molding equipment - Google Patents

Gate cutting device for injection molding equipment Download PDF

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JP6270493B2
JP6270493B2 JP2014004773A JP2014004773A JP6270493B2 JP 6270493 B2 JP6270493 B2 JP 6270493B2 JP 2014004773 A JP2014004773 A JP 2014004773A JP 2014004773 A JP2014004773 A JP 2014004773A JP 6270493 B2 JP6270493 B2 JP 6270493B2
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gate
arcuate
arc
resin material
gate cut
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JP2015131454A (en
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古川　淳
淳 古川
池田　義雄
義雄 池田
義雄 高田
義雄 高田
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Oiles Corp
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Description

本発明は、射出成形装置のゲートカット装置に関する。   The present invention relates to a gate cut device of an injection molding device.

例えば、合成樹脂製のフランジ付き軸受を射出成形装置により成形する場合、金型には、成形キャビティとして、軸受に対応した形状の円筒状キャビティと、フランジに対応した環板状キャビティが設けられ、環板状キャビティの外周部にゲート開口が設けられる。
そして、ゲート開口には、環板状キャビティの半径方向外方に延在するゲートが設けられる。
また、成形キャビティへの溶融状態の樹脂材料の供給時に、ゲートとゲート開口とを連通する第１の位置に位置し、樹脂材料の供給後に、ゲート開口を閉塞すると共にゲートに充填された樹脂材料部分を成形キャビティに充填された樹脂材料部分から切断する第２の位置に移動されるゲートカット部材が配置される。
従来、このようなゲートカット部材として、ゲートカット部材の移動方向から見て断面が矩形の部材が使用されている。 For example, when a flanged bearing made of synthetic resin is molded by an injection molding device, the mold is provided with a cylindrical cavity corresponding to the bearing and an annular plate cavity corresponding to the flange as a molding cavity. A gate opening is provided in the outer periphery of the annular plate cavity.
The gate opening is provided with a gate extending radially outward of the annular plate cavity.
Further, when the molten resin material is supplied to the molding cavity, the resin material is located at the first position where the gate and the gate opening communicate with each other, and after the resin material is supplied, the gate opening is closed and the gate is filled. A gate cut member is disposed which is moved to a second position for cutting the portion from the resin material portion filled in the molding cavity.
Conventionally, as such a gate cut member, a member having a rectangular cross section as viewed from the moving direction of the gate cut member has been used.

特開２００５−１７８３２２JP-A-2005-178322

一方、成形品の形状の完成度を高めようとすると、図５（Ｂ）に示すように、ゲートカット部材５０の一つの側面５００２をなるべく環板状キャビティ２８Ｂ側に近づけることが好ましい。
しかしながら、ゲートカット部材５０の一つの側面５００２を環板状キャビティ２８Ｂ側に近づけると、環板状キャビティ２８Ｂの外周部は円弧状空間部となっていることから、環板状キャビティ２８Ｂを構成する金型５２でゲート開口５２０１に近接する箇所５２０２が薄肉の三日月状とならざるを得ない。
そのため、薄肉の三日月状となった金型部分５２０２は、長期使用による摩耗により欠損し易く、金型の耐久性を高める上で問題があった。
本発明は前記事情に鑑み案出されたものであって、本発明の目的は、金型の耐久性を高める上で有利な射出成形装置のゲートカット装置を提供することにある。 On the other hand, in order to increase the degree of completeness of the shape of the molded product, it is preferable that one side surface 5002 of the gate cut member 50 be as close as possible to the ring-plate-shaped cavity 28B side as shown in FIG.
However, when one side surface 5002 of the gate cut member 50 is brought close to the ring plate-shaped cavity 28B side, the outer peripheral portion of the ring plate-shaped cavity 28B becomes an arc-shaped space portion, so that the ring plate-shaped cavity 28B is formed. A location 5202 adjacent to the gate opening 5201 in the mold 52 has to be a thin crescent.
Therefore, the thin-walled crescent-shaped mold portion 5202 is easily lost due to wear due to long-term use, and there is a problem in improving the durability of the mold.
The present invention has been devised in view of the above circumstances, and an object of the present invention is to provide a gate cut device for an injection molding device that is advantageous in enhancing the durability of a mold.

前記目的を達成するため本発明は、請求項１記載の発明は、円弧状空間部を有する成形キャビティと、前記円弧状空間部の外周箇所に設けられたゲート開口と、前記ゲート開口から前記円弧状空間部の半径方向外方に延在し前記ゲート開口を介して前記成形キャビティに溶融状態の樹脂材料を供給するゲートと、前記成形キャビティへの溶融状態の樹脂材料の供給時に、前記ゲートと前記ゲート開口とを連通する第１の位置に位置し、前記樹脂材料の供給後に、前記ゲート開口を閉塞すると共に前記ゲートに充填された樹脂材料部分を前記成形キャビティに充填された樹脂材料部分から切断する第２の位置に移動されるゲートカット部材とを備える射出成形装置のゲートカット装置であって、前記ゲート開口は、前記ゲートカット部材が移動される方向から見て、前記円弧状空間部の外周箇所で前記円弧状空間部側に窪んだ円弧状を呈し、前記ゲートカット部材は、前記ゲートカット部材が移動される方向から見て、前記第２の位置において前記円弧状空間部側に円弧状に窪んだ前記円弧状空間部の部分に侵入して前記ゲート開口を閉塞する前記円弧状空間部側に凸状の円弧部を有していることを特徴とする。
また、請求項２記載の発明は、ゲートカット部材は、その軸心方向に移動される断面が円形の円柱状部材で形成され、前記円弧部は、前記円柱状部材の外周部で形成されていることを特徴とする。
また、請求項３記載の発明は、前記円柱状部材の外周部に、前記円柱状部材の外周面の輪郭に沿った円弧状刃部が設けられ、前記円弧部は前記円弧状刃部で構成されていることを特徴とする。
また、請求項４記載の発明は、前記円柱状部材の先部に、前記ゲートを構成する凹部が前記円柱状部材の直径方向に貫通形成され、前記凹部の底面の前記ゲート開口寄りの部分は、前記ゲート開口に近づくにつれ前記第１の位置から前記第２の位置に向かう方向に次第に変位する傾斜面で形成され、前記傾斜面の先端と前記円柱状部材の外周面とにより、前記円弧状刃部が形成されていることを特徴とする。 In order to achieve the above object, the present invention is characterized in that the invention according to claim 1 is characterized in that a molding cavity having an arcuate space portion, a gate opening provided at an outer peripheral portion of the arcuate space portion, and the circle from the gate opening. A gate that extends radially outward of the arcuate space and supplies a molten resin material to the molding cavity through the gate opening; and at the time of supplying the molten resin material to the molding cavity, It is located at a first position communicating with the gate opening, and after supplying the resin material, the gate opening is closed and the resin material portion filled in the gate is removed from the resin material portion filled in the molding cavity. A gate cut device of an injection molding apparatus comprising a gate cut member moved to a second position to be cut, wherein the gate opening moves the gate cut member When viewed from the direction which exhibits the arcuate space arcuate recessed into the arcuate space side periphery portion of the gate cutting member, when viewed from a direction in which the gate cut member is moved, the first 2 has a convex arcuate portion on the arcuate space portion side that enters the arcuate space portion recessed in an arcuate shape on the arcuate space portion side and closes the gate opening. It is characterized by that.
According to a second aspect of the present invention, the gate cut member is formed of a cylindrical member having a circular cross section moved in the axial direction, and the arc portion is formed of an outer peripheral portion of the columnar member. It is characterized by being.
According to a third aspect of the present invention, an arcuate blade portion is provided on the outer peripheral portion of the columnar member along the contour of the outer peripheral surface of the columnar member, and the arc portion is configured by the arcuate blade portion. It is characterized by being.
According to a fourth aspect of the present invention, a concave portion that constitutes the gate is formed to penetrate in a diameter direction of the cylindrical member at a tip portion of the cylindrical member, and a portion of the bottom surface of the concave portion near the gate opening is The circular arc shape is formed by an inclined surface that gradually displaces in a direction from the first position toward the second position as the gate opening is approached, and is formed by the tip of the inclined surface and the outer peripheral surface of the cylindrical member. A blade portion is formed.

請求項１記載の発明によれば、ゲートカット部材が移動される方向から見て、ゲート開口が、円弧状空間部側に窪んだ円弧状を呈し、ゲートカット部材が、円弧状空間部側に凸状の円弧部を有しているので、成形キャビティを構成する金型でゲート開口に近接する箇所を肉厚にすることが可能となり、金型の耐久性を高める上で有利となる。
請求項２記載の発明によれば、ゲートカット部材を円柱状部材で形成し、円弧部を、円柱状部材の先部に位置し該円柱状部材の輪郭に沿った円柱状部材の外周部で形成したので、円弧部を有するゲートカット部材を簡単に確実に製作でき、ゲートカット装置のコストダウンを図る上で有利となる。
請求項３記載の発明によれば、円弧部を円弧状刃部で形成したので、成形キャビティにより得られた製品に設けられる円弧状の欠部の切断面を滑らかな面とする上で有利となり、成形品の商品価値を高める上で有利となる。
請求項４記載の発明によれば、円弧状刃部を凹部の底面の傾斜面と円柱状部材の外周面とで形成したので、円弧状刃部を簡単に確実に製作でき、ゲートカット装置のコストダウンを図る上で有利となる。 According to the first aspect of the present invention, when viewed from the direction in which the gate cut member is moved, the gate opening has an arc shape that is recessed toward the arc space portion, and the gate cut member is located on the arc space portion side. Since the convex arc portion is provided, it is possible to increase the thickness of the portion of the mold constituting the molding cavity close to the gate opening, which is advantageous in increasing the durability of the mold.
According to the second aspect of the present invention, the gate cut member is formed of a columnar member, and the arc portion is positioned at the tip of the columnar member at the outer peripheral portion of the columnar member along the contour of the columnar member. Since it is formed, the gate cut member having the arc portion can be easily and reliably manufactured, which is advantageous in reducing the cost of the gate cut device.
According to the third aspect of the invention, since the arc portion is formed by the arc-shaped blade portion, it is advantageous for making the cut surface of the arc-shaped notch provided in the product obtained by the molding cavity a smooth surface. This is advantageous in increasing the product value of the molded product.
According to the invention of claim 4, since the arcuate blade portion is formed by the inclined surface of the bottom surface of the recess and the outer peripheral surface of the cylindrical member, the arcuate blade portion can be easily and reliably manufactured, This is advantageous for cost reduction.

下型と上型とを合わせた状態の断面図である。It is sectional drawing of the state which combined the lower mold | type and the upper mold | type. ランナー、ゲートから溶融状態の樹脂材料を成形キャビティに供給した状態の断面図である。It is sectional drawing of the state which supplied the resin material of the molten state from the runner and the gate to the shaping | molding cavity. ゲートカット部材をゲートに横断させた状態の断面図である。It is sectional drawing of the state which made the gate cut member cross the gate. （Ａ）はゲートカット部材の上部の正面図、（Ｂ）は同平面図、（Ｃ）は（Ｂ）のＣ矢視図である。(A) is a front view of the upper part of a gate cut member, (B) is the same top view, (C) is a C arrow line view of (B). 成形キャビティとゲートカット部材との関係を示す平面図で（Ａ）はゲートカット部材の円弧部と成形キャビティとの関係図、（Ｂ）は断面が矩形のゲートカット部材と成形キャビティの関係図である。FIG. 4A is a plan view showing the relationship between a molding cavity and a gate cut member, FIG. 4A is a diagram showing the relationship between the arc portion of the gate cut member and the molding cavity, and FIG. is there. 実施の形態の射出成形装置により得られるフランジ付き軸受の斜視図である。It is a perspective view of the bearing with a flange obtained by the injection molding apparatus of embodiment.

以下、本発明の実施の形態を図面にしたがって説明する。
まず、本実施の形態の射出成形装置により成形される成形品から説明する。
図６に示すように、成形品はフランジ付き軸受１０であり、低摩擦性及び耐摩耗性に優れた合成樹脂材料から形成されている。
フランジ付き軸受１０は、ラジアル軸受として機能する円筒部１２と、円筒部１２の軸方向の一端に形成された環板状のフランジ１４とを備え、フランジ１４には円弧状の欠部１６が形成されている。
フランジ付き軸受１０は、円筒部１２が所定の軸受孔に配置され、フランジ１４が適宜取り付け手段により軸受孔の近傍の適宜箇所に取着され、これにより円筒部１２が軸受孔に固定される。また、フランジ１４はスラスト軸受部として作用するように取り付けても良い。
このようにフランジ付き軸受１０は、円筒部１２がラジアル軸受部として機能し、フランジ１４が被取り付け部材又はスラスト軸受部として機能できるため、フランジ１４に欠部１６が設けられていても過大な欠部でない限り本来の軸受としての機能には何ら影響を及ぼすものではない。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.
First, the molded product molded by the injection molding apparatus of the present embodiment will be described.
As shown in FIG. 6, the molded product is a flanged bearing 10 and is formed of a synthetic resin material having excellent low friction and wear resistance.
The flanged bearing 10 includes a cylindrical portion 12 that functions as a radial bearing, and an annular plate-like flange 14 formed at one end of the cylindrical portion 12 in the axial direction. The flange 14 has an arc-shaped notch 16 formed therein. Has been.
As for the bearing 10 with a flange, the cylindrical part 12 is arrange | positioned in a predetermined bearing hole, The flange 14 is attached to the appropriate location of the vicinity of a bearing hole by an appropriate attachment means, and, thereby, the cylindrical part 12 is fixed to a bearing hole. Moreover, you may attach the flange 14 so that it may act as a thrust bearing part.
Thus, in the flanged bearing 10, the cylindrical portion 12 functions as a radial bearing portion, and the flange 14 can function as a member to be attached or a thrust bearing portion. As long as it is not a part, it does not affect the function of the original bearing.

次に、本実施の形態のゲートカット装置を備える射出成形装置について説明する。
図１に示すように、射出成形装置２０は、移動金型である下型２４と、固定金型である上型２６と、ゲートカット装置２２とを備えている。
下型２４と上型２６の合わせ面に、フランジ付き軸受１０を成形するための成形キャビティ２８が形成されている。
成形キャビティ２８は、円筒部１２に対応した円筒状空間を有する円筒状キャビティ２８Ａと、フランジ１４に対応した環板状空間を有する環板状キャビティ２８Ｂとを有している。
環板状キャビティ２８Ｂの外周部は円弧状空間部となっており、この環板状キャビティ２８Ｂの外周縁部には、ゲート開口３５が形成されている。ゲート開口３５は、図５（Ａ）に示すように、平面視した場合、環板状キャビティ２８Ｂ側に窪んだ円弧面で形成されている。
このような成形キャビティ２８は、下型２４に形成された凹部と、上型２６に形成された凹部と、下型２４に設けられたコアピン３０の軸部とで構成されている。 Next, an injection molding apparatus provided with the gate cut apparatus of this Embodiment is demonstrated.
As shown in FIG. 1, the injection molding apparatus 20 includes a lower mold 24 that is a movable mold, an upper mold 26 that is a fixed mold, and a gate cut device 22.
A molding cavity 28 for molding the flanged bearing 10 is formed on the mating surface of the lower mold 24 and the upper mold 26.
The molding cavity 28 includes a cylindrical cavity 28 </ b> A having a cylindrical space corresponding to the cylindrical portion 12 and an annular plate cavity 28 </ b> B having an annular plate space corresponding to the flange 14.
The outer peripheral portion of the annular plate cavity 28B is an arc space, and a gate opening 35 is formed on the outer peripheral edge of the annular plate cavity 28B. As shown in FIG. 5A, the gate opening 35 is formed by an arcuate surface that is recessed toward the annular plate-shaped cavity 28B when viewed in plan.
Such a molding cavity 28 includes a recess formed in the lower mold 24, a recess formed in the upper mold 26, and a shaft portion of the core pin 30 provided in the lower mold 24.

また、下型２４と上型２６の合わせ面に、ゲート開口３５を介して成形キャビティ２８に、溶融状態の樹脂材料を供給するランナー３２とゲート３４とが形成されている。
それらランナー３２とゲート３４は、環板状キャビティ２８Ｂの半径方向外方に延在し、ゲート３４がゲート開口３５を介して環板状キャビティ２８Ｂに連通している。
なお、本発明においてゲート３４とは、ランナー３２とゲート開口３５との間に位置する箇所であり、後述するゲートカット部材３６が横断する箇所である。 Further, a runner 32 and a gate 34 for supplying a molten resin material to the molding cavity 28 through the gate opening 35 are formed on the mating surface of the lower mold 24 and the upper mold 26.
The runners 32 and the gate 34 extend outward in the radial direction of the annular plate cavity 28 </ b> B, and the gate 34 communicates with the annular plate cavity 28 </ b> B through the gate opening 35.
In the present invention, the gate 34 is a portion located between the runner 32 and the gate opening 35, and is a portion where a gate cut member 36 described later crosses.

また、下型２４には、ゲート３４の延在方向と直角に交差する方向である上下方向に延在し、ゲート開口３５を開閉すると共に、ゲート３４に充填された樹脂材料部分を、環板状キャビティ２８Ｂに充填された樹脂材料部分から切断するゲートカット部材３６が配置されている。ゲートカット部材３６は、例えば、油圧シリンダなどのアクチュエータ又は一般的な射出成形機で用いられるエジェクター突出機構を利用して移動され、ゲートカット装置２２は、このゲートカット部材３６を含んで構成されている。
ゲートカット部材３６は、溶融状態の樹脂材料が成形キャビティ２８に供給される際、図１、図２に示すように、ゲート３４とゲート開口３５とを連通させる第１の位置に待機される。
また、ゲートカット部材３６は、溶融状態の樹脂材料の成形キャビティ２８への供給後、図３に示すように上昇し、ゲート開口３５を閉塞すると共に、ゲート３４に充填された樹脂材料部分を、成形キャビティ２８に充填された樹脂材料部分から切断する第２の位置に移動される。 The lower mold 24 extends in the vertical direction, which is a direction perpendicular to the extending direction of the gate 34, opens and closes the gate opening 35, and the resin material portion filled in the gate 34 is provided with a ring plate. A gate cut member 36 for cutting from the resin material portion filled in the cavities 28B is disposed. The gate cut member 36 is moved using, for example, an actuator such as a hydraulic cylinder or an ejector protruding mechanism used in a general injection molding machine, and the gate cut device 22 includes the gate cut member 36. Yes.
When the molten resin material is supplied to the molding cavity 28, the gate cut member 36 stands by at a first position where the gate 34 and the gate opening 35 communicate with each other as shown in FIGS. 1 and 2.
Further, the gate cut member 36 rises as shown in FIG. 3 after supplying the molten resin material to the molding cavity 28, closes the gate opening 35, and removes the resin material portion filled in the gate 34. The resin material portion filled in the molding cavity 28 is moved to a second position for cutting.

図４（Ａ）〜（Ｃ）に示すように、ゲートカット部材３６は、断面が円形の円柱状部材３６Ａで形成され、円柱状部材３６Ａは、第１の位置と第２の位置との間でその軸心方向に移動される。
ゲートカット部材３６である円柱状部材３６Ａは、第２の位置で、ゲート３４に隣接する成形キャビティ２８部分（環板状キャビティ２８Ｂの外周縁部）に侵入し成形キャビティ２８部分に充填された樹脂材料部分を切断すると共に、ゲート開口３５を閉塞する環板状キャビティ２８Ｂ側に凸状の円弧部３８を有している。
円弧部３８は、円柱状部材３６Ａの上部に位置する円柱状部材３６Ａの外周部で形成されている。 As shown in FIGS. 4A to 4C, the gate cut member 36 is formed of a cylindrical member 36A having a circular cross section, and the cylindrical member 36A is between the first position and the second position. Is moved in the axial direction.
The cylindrical member 36A, which is the gate cut member 36, enters the molding cavity 28 portion adjacent to the gate 34 (the outer peripheral edge of the annular plate cavity 28B) at the second position, and fills the molding cavity 28 portion. The material portion is cut, and a convex arc portion 38 is provided on the annular plate-shaped cavity 28 </ b> B side that closes the gate opening 35.
The arc portion 38 is formed by the outer peripheral portion of the columnar member 36A located at the upper portion of the columnar member 36A.

より詳細に説明すると、図４（Ｂ）、（Ｃ）に示すように、円柱状部材３６Ａの上部に、ゲート３４を構成する凹部４０が円柱状部材３６Ａの直径方向に貫通形成されている。
凹部４０は、下部４０Ａと、下部４０Ａよりも幅の広い上部４０Ｂとを備え、環板状キャビティ２８Ｂに連通する上部４０Ｂの部分は、凹部４０の下部４０Ａと同じ幅で形成されている。
すなわち、凹部４０の上部４０Ｂの幅は、環板状キャビティ２８Ｂに近づくほど狭くなっている。
そのため、凹部４０に充填された樹脂材料部分の硬化が早期になされることで、ゲート３４、ゲート開口３５から環板状キャビティ２８Ｂに向かう溶融状態の樹脂材料の流れを早期に停止させる上で有利となる。
図４（Ａ）に示すように、下部４０Ａの底面で環板状キャビティ２８Ｂに連通する部分は、環板状キャビティ２８Ｂに近づくにつれて次第に上昇する傾斜面４２で形成され、この傾斜面４２の先端と円柱状部材３６Ａの外周面とにより、平面視した場合、環板状キャビティ２８Ｂ側に凸状の円弧状刃部３８Ａとなっており、この円弧状刃部３８Ａは円弧部３８を構成している。 More specifically, as shown in FIGS. 4B and 4C, a recess 40 constituting the gate 34 is formed in the upper part of the columnar member 36A so as to penetrate in the diameter direction of the columnar member 36A.
The recess 40 includes a lower portion 40A and an upper portion 40B wider than the lower portion 40A, and a portion of the upper portion 40B communicating with the annular plate cavity 28B is formed with the same width as the lower portion 40A of the recess 40.
That is, the width of the upper portion 40B of the concave portion 40 becomes narrower as it approaches the annular plate cavity 28B.
Therefore, the resin material portion filled in the recess 40 is hardened at an early stage, which is advantageous in stopping the flow of the molten resin material from the gate 34 and the gate opening 35 toward the annular plate-shaped cavity 28B at an early stage. It becomes.
As shown in FIG. 4A, a portion communicating with the annular plate-like cavity 28B on the bottom surface of the lower portion 40A is formed by an inclined surface 42 that gradually rises as it approaches the annular plate-like cavity 28B. And the outer peripheral surface of the columnar member 36A, when viewed in plan, the arcuate blade portion 38A is convex toward the annular plate-shaped cavity 28B, and the arcuate blade portion 38A constitutes the arc portion 38. Yes.

次に、ゲートカット装置２２を備える射出成形装置２０の動作について説明する。
下型２４と上型２６の合わせ面が合わされ、溶融状態の樹脂材料が成形キャビティ２８に供給される際、ゲートカット部材３６は、図１、図２に示すように、円柱状部材３６Ａの凹部４０がゲート３４を構成する第１の位置に位置している。
また、溶融状態の樹脂材料が成形キャビティ２８に供給され、ゲート３４および成形キャビティ２８に充填された樹脂材料の表面が固まり始め、樹脂材料の内部が溶融状態となる半溶融状態で、図３に示すように、ゲートカット部材３６は上昇し、ゲートカット部材３６の外周面でゲート開口３５を閉塞すると共に、ゲート３４に充填された樹脂材料部分を、円弧状刃部３８Ａにより成形キャビティ２８に充填された樹脂材料部分から切断する第２の位置となる。
そして、成形キャビティ２８を冷却し、成形キャビティ２８に充填された樹脂材料が硬化した後、型を開いて成形品を取り出すと、図６に示すフランジ付き軸受１０が得られる。 Next, operation | movement of the injection molding apparatus 20 provided with the gate cut apparatus 22 is demonstrated.
When the mating surfaces of the lower mold 24 and the upper mold 26 are brought together and the molten resin material is supplied to the molding cavity 28, the gate cut member 36 has a concave portion of the cylindrical member 36A as shown in FIGS. 40 is located at the first position constituting the gate 34.
Further, the molten resin material is supplied to the molding cavity 28, the surfaces of the resin material filled in the gate 34 and the molding cavity 28 start to harden, and the resin material is in a semi-molten state where the inside of the resin material is in a molten state. As shown, the gate cut member 36 rises, closes the gate opening 35 at the outer peripheral surface of the gate cut member 36, and fills the molding cavity 28 with the resin material portion filled in the gate 34 by the arcuate blade portion 38A. It becomes the 2nd position cut | disconnected from the made resin material part.
Then, after the molding cavity 28 is cooled and the resin material filled in the molding cavity 28 is cured, when the mold is opened and the molded product is taken out, the flanged bearing 10 shown in FIG. 6 is obtained.

本実施の形態によれば、円弧状空間部をなす環板状キャビティ２８Ｂの外周部を構成する金型２４でゲート開口３５に近接する箇所２４０２を肉厚にすることが可能となる。
比較例として図５（Ｂ）を参照して説明すると、ゲートカット部材５０を断面が矩形の部材で形成した場合、環板状キャビティ２８Ｂを構成する金型５２でゲート開口３５に近接する箇所５２０２は、ゲートカット部材３６の一側面５００２と、環板状キャビティ２８Ｂの円筒面とにより薄肉の三日月状とならざるを得ない。
そのため、薄肉の三日月状となった金型５２の箇所５２０２は、ゲートカット部材５０から受ける応力によって逃げることから、金型５２の箇所５２０２とゲートカット部材３６との間に遊びが生じやすい。したがって、金型５２の箇所５２０２は、長期使用による摩耗により欠損し易く、金型５２の耐久性を高める上で問題が生じる。
これに対して本実施の形態では、図５（Ａ）に示すように、ゲート開口３５が環板状キャビティ２８Ｂ側に窪んだ円弧面で形成され、ゲートカット部材３６が、ゲート３４に充填された樹脂材料部分の切断時に、環板状キャビティ２８Ｂ側に凸状の円弧部３８を有しているので、環板状キャビティ２８Ｂを構成する金型２４でゲート開口３５に近接する箇所２４０２を肉厚にすることが可能となる。
そのため、比較例と比較して、ゲート３４に近接する金型２４の箇所２４０２は、ゲートカット部材３６から受ける応力によって逃げることが抑制されることから、ゲート３４に近接する金型２４の箇所２４０２とゲートカット部材３６との間に遊びが生じにくくなる。したがって、ゲート３４に近接する金型の箇所は、長期使用による摩耗が少なく金型２４の耐久性を高める上で有利となる。
なお、得られたフランジ付き軸受１０は、フランジ１４に円弧状の欠部１６が設けられているものの、その大きさは小さいため、円筒部１２がラジアル軸受部として機能し、フランジ１４が被取り付け部材又はスラスト軸受部として機能できるため、本来の軸受としての機能には何ら影響を及ぼすものではない。 According to the present embodiment, it is possible to make the portion 2402 close to the gate opening 35 thick in the mold 24 constituting the outer peripheral portion of the annular plate-shaped cavity 28B forming the arc-shaped space portion.
As a comparative example, a description will be given with reference to FIG. 5B. When the gate cut member 50 is formed of a member having a rectangular cross section, a location 5202 close to the gate opening 35 by a mold 52 constituting the annular plate cavity 28B. In this case, the side surface 5002 of the gate cut member 36 and the cylindrical surface of the annular plate-shaped cavity 28B have to be thin crescents.
Therefore, the portion 5202 of the mold 52 having a thin crescent shape escapes due to the stress received from the gate cut member 50, and play is likely to occur between the portion 5202 of the mold 52 and the gate cut member 36. Therefore, the location 5202 of the mold 52 is easily lost due to wear due to long-term use, and a problem arises in improving the durability of the mold 52.
In contrast, in the present embodiment, as shown in FIG. 5A, the gate opening 35 is formed by an arcuate surface that is recessed toward the annular plate cavity 28B, and the gate cut member 36 is filled in the gate 34. When the resin material portion is cut, a convex arcuate portion 38 is provided on the annular plate-shaped cavity 28B side, so that a portion 2402 adjacent to the gate opening 35 is formed in the mold 24 constituting the annular plate-shaped cavity 28B. It becomes possible to make it thick.
Therefore, as compared with the comparative example, the portion 2402 of the mold 24 adjacent to the gate 34 is suppressed from escaping due to the stress received from the gate cut member 36, and therefore the portion 2402 of the mold 24 adjacent to the gate 34. And the gate cut member 36 are less likely to have play. Therefore, the location of the mold close to the gate 34 is advantageous in increasing the durability of the mold 24 with less wear due to long-term use.
In addition, although the obtained flanged bearing 10 is provided with an arc-shaped notch 16 in the flange 14, the size thereof is small, so the cylindrical portion 12 functions as a radial bearing portion, and the flange 14 is attached. Since it can function as a member or a thrust bearing part, the function as an original bearing is not affected at all.

また、本実施の形態では、ゲートカット部材３６を円柱状部材３６Ａで形成し、円弧部３８を、円柱状部材３６Ａの先部に位置し該円柱状部材３６Ａの輪郭に沿った円柱状部材３６Ａの外周部で形成したので、円弧部３８を有するゲートカット部材３６を簡単に確実に製作でき、ゲートカット装置２２のコストダウンを図る上で有利となる。
また、本実施の形態では、円弧部３８を円弧状刃部３８Ａで形成したので、製品であるフランジ付き軸受１０のフランジ１４に設けられた円弧状の欠部１６の切断面（円筒面）を滑らかな面とする上で有利となり、フランジ付き軸受１０の商品価値を高める上で有利となる。
また、本実施の形態では、円柱状部材３６Ａの先部に、ゲート３４を構成する凹部４０が円柱状部材３６Ａの直径方向に貫通形成され、円弧状刃部３８Ａを凹部４０の底面の傾斜面４２と円柱状部材３６Ａの外周面で形成したので、円弧状刃部３８Ａを簡単に製造でき、ゲートカット装置のコストダウンを図る上で有利となる。 Further, in the present embodiment, the gate cut member 36 is formed of a cylindrical member 36A, and the circular arc portion 38 is located at the tip of the cylindrical member 36A and extends along the contour of the cylindrical member 36A. Therefore, the gate cut member 36 having the arc portion 38 can be easily and reliably manufactured, which is advantageous in reducing the cost of the gate cut device 22.
In the present embodiment, since the arc portion 38 is formed by the arc-shaped blade portion 38A, the cut surface (cylindrical surface) of the arc-shaped notch portion 16 provided on the flange 14 of the flanged bearing 10 which is a product is used. This is advantageous for making the surface smooth, and is advantageous for enhancing the commercial value of the flanged bearing 10.
Further, in the present embodiment, the concave portion 40 constituting the gate 34 is formed through the tip of the cylindrical member 36A in the diameter direction of the cylindrical member 36A, and the arcuate blade portion 38A is inclined on the bottom surface of the concave portion 40. 42 and the outer peripheral surface of the cylindrical member 36A, the arcuate blade portion 38A can be easily manufactured, which is advantageous in reducing the cost of the gate cutting device.

なお、本実施の形態では、射出成形装置２０により得られる製品がフランジ付き軸受１０である場合について説明したが、本発明の円弧状空間部は、実施の形態のように３６０度の範囲に延在する円弧状空間部に限定されず、弓形のように部分的に延在する円弧状空間部であってもよく、また、本発明により成形される製品はフランジ付き軸受１０に限定されず、円弧状空間部を有する成形キャビティ２８で製造されるその他の様々な部材の成形に適用可能である。   In the present embodiment, the case where the product obtained by the injection molding apparatus 20 is the flanged bearing 10 has been described. However, the arc space portion of the present invention extends to a range of 360 degrees as in the embodiment. The present invention is not limited to the existing arc-shaped space portion, and may be an arc-shaped space portion that extends partially like an arcuate shape, and the product formed according to the present invention is not limited to the flanged bearing 10, The present invention can be applied to molding various other members manufactured by the molding cavity 28 having an arc space.

２０ 射出成形装置
２２ ゲートカット装置
２８ 成形キャビティ
２８Ａ 円筒状キャビティ
２８Ｂ 環板状キャビティ
３４ ゲート
３５ ゲート開口
３６ ゲートカット部材
３６Ａ 円柱状部材
３８ 円弧部
３８Ａ 円弧状刃部
４０ 凹部
４２ 傾斜面 20 Injection molding device 22 Gate cut device 28 Molding cavity 28A Cylindrical cavity 28B Annular plate cavity 34 Gate 35 Gate opening 36 Gate cut member 36A Cylindrical member 38 Arc portion 38A Arc shape blade portion 40 Recess 42 Inclined surface

Claims (4)

円弧状空間部を有する成形キャビティと、
前記円弧状空間部の外周箇所に設けられたゲート開口と、
前記ゲート開口から前記円弧状空間部の半径方向外方に延在し前記ゲート開口を介して前記成形キャビティに溶融状態の樹脂材料を供給するゲートと、
前記成形キャビティへの溶融状態の樹脂材料の供給時に、前記ゲートと前記ゲート開口とを連通する第１の位置に位置し、前記樹脂材料の供給後に、前記ゲート開口を閉塞すると共に前記ゲートに充填された樹脂材料部分を前記成形キャビティに充填された樹脂材料部分から切断する第２の位置に移動されるゲートカット部材と、
を備える射出成形装置のゲートカット装置であって、
前記ゲート開口は、前記ゲートカット部材が移動される方向から見て、前記円弧状空間部の外周箇所で前記円弧状空間部側に窪んだ円弧状を呈し、
前記ゲートカット部材は、前記ゲートカット部材が移動される方向から見て、前記第２の位置において前記円弧状空間部側に円弧状に窪んだ前記円弧状空間部の部分に侵入して前記ゲート開口を閉塞する前記円弧状空間部側に凸状の円弧部を有している、
ことを特徴とする射出成形装置のゲートカット装置。 A molding cavity having an arcuate space;
A gate opening provided at an outer periphery of the arcuate space,
A gate extending radially outward of the arcuate space from the gate opening and supplying a molten resin material to the molding cavity through the gate opening;
When the molten resin material is supplied to the molding cavity, the gate is located at a first position where the gate communicates with the gate opening, and after the resin material is supplied, the gate opening is closed and the gate is filled. A gate cut member that is moved to a second position for cutting the resin material portion made from the resin material portion filled in the molding cavity;
A gate cut device of an injection molding device comprising:
The gate opening has an arcuate shape that is recessed toward the arcuate space part at the outer periphery of the arcuate space part when viewed from the direction in which the gate cut member is moved,
The gate cut member enters the portion of the arcuate space portion that is recessed in an arc shape on the arcuate space portion side at the second position when viewed from the direction in which the gate cut member is moved. A convex arc portion on the arc-shaped space portion side closing the opening;
A gate cut device for an injection molding device. ゲートカット部材は、その軸心方向に移動される断面が円形の円柱状部材で形成され、
前記円弧部は、前記円柱状部材の外周部で形成されている、
ことを特徴とする請求項１記載の射出成形装置のゲートカット装置。 The gate cut member is formed of a circular columnar member whose cross section is moved in the axial direction,
The arc portion is formed by an outer peripheral portion of the columnar member.
The gate cut device of an injection molding device according to claim 1. 前記円柱状部材の外周部に、前記円柱状部材の外周面の輪郭に沿った円弧状刃部が設けられ、
前記円弧部は前記円弧状刃部で構成されている、
ことを特徴とする請求項２記載の射出成形装置のゲートカット装置。 On the outer peripheral part of the cylindrical member, an arcuate blade part is provided along the contour of the outer peripheral surface of the cylindrical member,
The arc portion is composed of the arc-shaped blade portion,
The gate cut device of an injection molding device according to claim 2. 前記円柱状部材の先部に、前記ゲートを構成する凹部が前記円柱状部材の直径方向に貫通形成され、
前記凹部の底面の前記ゲート開口寄りの部分は、前記ゲート開口に近づくにつれ前記第１の位置から前記第２の位置に向かう方向に次第に変位する傾斜面で形成され、
前記傾斜面の先端と前記円柱状部材の外周面とにより、前記円弧状刃部が形成されている、
ことを特徴とする請求項３記載の射出成形装置のゲートカット装置。 At the tip of the cylindrical member, a recess that constitutes the gate is formed penetrating in the diameter direction of the cylindrical member,
The portion near the gate opening on the bottom surface of the recess is formed by an inclined surface that gradually displaces from the first position toward the second position as the gate opening is approached.
The arcuate blade portion is formed by the tip of the inclined surface and the outer peripheral surface of the cylindrical member.
The gate cut device of an injection molding device according to claim 3.
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