JP2007125815A - Resin molding apparatus - Google Patents

Resin molding apparatus Download PDF

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JP2007125815A
JP2007125815A JP2005321105A JP2005321105A JP2007125815A JP 2007125815 A JP2007125815 A JP 2007125815A JP 2005321105 A JP2005321105 A JP 2005321105A JP 2005321105 A JP2005321105 A JP 2005321105A JP 2007125815 A JP2007125815 A JP 2007125815A
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mold
die
shaped member
molten resin
resin
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JP4755884B2 (en
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Yusuke Ishii
雄介 石井
Haruhiko Kikuchi
治彦 菊地
Hideaki Kitsuta
英晃 橘田
Masayasu Ogami
雅康 大上
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Shibaura Machine Co Ltd
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Toshiba Machine Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To prevent entrainment of air between a molten resin and the mold in a resin molding apparatus which discharges a molten resin on a mold through a T die by the use of an injection apparatus equipped with a T die at the discharge outlet and clamps to mold a resin product. <P>SOLUTION: A gutter-shaped member 4 for receiving a molten resin 1 discharged from a T die 3 and flowing it onto the mold 5 is arranged below the T die 3, and the bottom surface of the gutter-shaped member 4 is inclined so that the central part is lower than peripheral edge parts with respect to the flow of the molten resin 1 in the vertical cross-section. In this example, the cross-section of the bottom surface of the gutter-shaped member 4 is V-shaped. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、樹脂成形装置に係り、特に、吐出口にＴダイが設けられた射出装置を用いて、Ｔダイを介して金型上に溶融樹脂を吐出し、次いで型締めを行うことにより樹脂製品を成形する樹脂成形装置に係る。   The present invention relates to a resin molding apparatus, and in particular, a resin by discharging a molten resin onto a mold through a T die using an injection apparatus provided with a T die at a discharge port, and then performing mold clamping. The present invention relates to a resin molding apparatus for molding a product.

平板状の樹脂製品を成形する際、吐出口にＴダイが設けられた射出装置を用い、射出装置からＴダイを介して金型上に溶融樹脂を吐出し、次いで型締めを行うことにより樹脂製品を成形することが行われている。この方法を用いて、光学用途等の高精度が要求される樹脂製品を成形する場合、Ｔダイから吐出される溶融樹脂の量、温度などを正確にコントロールするとともに、金型上に吐出されたときの溶融樹脂の形状を安定させることが重要になる。   When molding a flat resin product, an injection device provided with a T die at the discharge port is used. The molten resin is discharged from the injection device onto the mold through the T die, and then the mold is clamped. Molding the product is done. When using this method to mold resin products that require high precision such as optical applications, the amount of molten resin discharged from the T-die, the temperature, etc. are accurately controlled and discharged onto the mold. It is important to stabilize the shape of the molten resin.

金型上に吐出されたときの溶融樹脂の形状を調整することを目的として、図５に示すように、Ｔダイ（図示せず）の下側に、Ｔダイから吐出された溶融樹脂１を受けて金型５上に流し込む樋状の部材４を配置することが行われている。しかし、このような方法を平板上の樹脂製品を成形する際に採用すると、溶融樹脂１と金型５の間に空気が巻き込まれ、型締めして成形した際に樹脂製品に欠陥が生じることがあった。   For the purpose of adjusting the shape of the molten resin when discharged onto the mold, as shown in FIG. 5, the molten resin 1 discharged from the T die is placed below the T die (not shown). Arrangement of a bowl-shaped member 4 that is received and poured onto the mold 5 is performed. However, when such a method is adopted when molding a resin product on a flat plate, air is caught between the molten resin 1 and the mold 5, and defects are generated in the resin product when the mold is clamped and molded. was there.

本発明は、以上のようなＴダイを介して金型上に溶融樹脂を吐出して成形する装置における問題点に鑑み成されたものである。本発明の目的は、そのような樹脂成形装置において、溶融樹脂と金型の間に空気が巻き込まれることを防止し、樹脂製品の品質の向上を図ることにある。   The present invention has been made in view of the problems in an apparatus for discharging and molding a molten resin onto a mold through a T-die as described above. An object of the present invention is to prevent air from being caught between a molten resin and a mold in such a resin molding apparatus and to improve the quality of the resin product.

本発明の樹脂成形装置は、
吐出口にＴダイが設けられた射出装置を用いて、Ｔダイを介して金型上に溶融樹脂を吐出し、次いで型締を行うことにより、樹脂製品を成形する樹脂成形装置において、
Ｔダイの下側に、Ｔダイから吐出された溶融樹脂を受けて金型上に流し込む樋状の部材を配置するとともに、この部材の底面に、溶融樹脂の流れに対して垂直方向の断面において中央部が周縁部よりも低くなるように傾斜を与えたことを特徴とする。 The resin molding apparatus of the present invention is
In a resin molding apparatus for molding a resin product by discharging a molten resin onto a mold through a T die using an injection device provided with a T die at a discharge port, and then performing mold clamping,
A trough-shaped member that receives the molten resin discharged from the T die and flows onto the mold is disposed below the T die, and the bottom surface of the member has a cross section perpendicular to the flow of the molten resin. The central portion is inclined so as to be lower than the peripheral portion.

本発明の樹脂成形装置によれば、前記樋状の部材から流し込まれた溶融樹脂は、最初にその下面の中央部で金型の表面に接触し、次いで、接触面が中央部から周縁部に徐々に広がって行く。このため、溶融樹脂の下側に接している空気が効果的に排除され、溶融樹脂と金型の間に巻き込まれることがない。   According to the resin molding apparatus of the present invention, the molten resin poured from the bowl-shaped member first contacts the surface of the mold at the center of the lower surface, and then the contact surface changes from the center to the peripheral portion. It gradually spreads. For this reason, the air which is in contact with the lower side of the molten resin is effectively excluded and is not caught between the molten resin and the mold.

好ましくは、前記樋状の部材の底面の断面形状を、Ｖ字状に形成する。   Preferably, the cross-sectional shape of the bottom surface of the bowl-shaped member is formed in a V shape.

好ましくは、更に、前記樋状の部材の先端部の平面形状を、中央部が周縁部よりも後退するようにＶ字状に形成する。   Preferably, the planar shape of the distal end portion of the bowl-shaped member is further formed in a V shape so that the central portion is retracted from the peripheral portion.

図１に、本発明に基づく樹脂成形装置の全体概要を示す。図中、１０は射出装置、２０は型締装置、３０は架台、４０は移動装置、３はＴダイ、４は樋状の部材、５及び６は金型を表わす。   In FIG. 1, the whole outline | summary of the resin molding apparatus based on this invention is shown. In the figure, 10 is an injection device, 20 is a mold clamping device, 30 is a gantry, 40 is a moving device, 3 is a T die, 4 is a bowl-shaped member, and 5 and 6 are molds.

Ｔダイ３は、射出装置１０のバレル２の先に取り付けられている。上下の金型５及び６は、型締装置２０に取り付けられている。樋状の部材４は、Ｔダイ３の前方に取り付けられている。樋状の部材４は、Ｔダイ３から吐出された溶融樹脂を受けて金型５上に流し込むように、Ｔダイ３からの吐出口と金型５の間に配置されている。   The T die 3 is attached to the tip of the barrel 2 of the injection apparatus 10. The upper and lower molds 5 and 6 are attached to a mold clamping device 20. The bowl-shaped member 4 is attached in front of the T die 3. The bowl-shaped member 4 is disposed between the discharge port from the T die 3 and the mold 5 so that the molten resin discharged from the T die 3 is received and poured onto the mold 5.

射出装置１０と架台３０の間には、射出装置１０を前後（図１では、左右方向）に移動する為の移動装置４０が設けられている。溶融樹脂が樋状の部材４より金型５上に流し込まれ始めると、射出装置１０は金型５から遠ざかる方向（図１では、右側方向）に後退し始め、金型５上の所定の面全体に溶融樹脂が流し込まれる。溶融樹脂の流し込みが終わると、射出装置１０は更に後退し、Ｔダイ３及び樋状の部材４は金型５及び６の間より抜け、所定の位置に退避する。その後、型締装置２０により、溶融樹脂が流し込まれた金型５と金型６を型締めし、樹脂製品を成形する。   Between the injection device 10 and the gantry 30, a moving device 40 for moving the injection device 10 back and forth (in the left-right direction in FIG. 1) is provided. When the molten resin starts to be poured from the bowl-shaped member 4 onto the mold 5, the injection device 10 begins to move back in the direction away from the mold 5 (right side in FIG. 1), and a predetermined surface on the mold 5. Molten resin is poured into the whole. When the pouring of the molten resin is finished, the injection device 10 is further retracted, and the T die 3 and the bowl-shaped member 4 are withdrawn from between the molds 5 and 6 and retracted to a predetermined position. Thereafter, the mold 5 and the mold 6 into which the molten resin is poured are clamped by the mold clamping device 20 to mold a resin product.

図２に、本発明に基づく樹脂成形装置で使用される樋状の部材の例を示す。この例では、樋状の部材４の底面の断面形状は、溶融樹脂１の流れに対して垂直方向の断面において中央部が周縁部よりも低くなるようにＶ字状に形成されている。このように、樋状の部材４の底面に、中央部が周縁部よりも低くなるように傾斜を与えることによって、樋状の部材４から流し込まれた溶融樹脂１は、最初にその下面の中央部で金型５の表面に接触し、次いで、接触面が中央部から周縁部に徐々に広がって行く。これにより、溶融樹脂１の下側に接している空気が効果的に排除され、溶融樹脂１と金型５の間に空気が巻き込まれることを防止することができる。   In FIG. 2, the example of the bowl-shaped member used with the resin molding apparatus based on this invention is shown. In this example, the cross-sectional shape of the bottom surface of the bowl-shaped member 4 is formed in a V shape so that the central portion is lower than the peripheral portion in the cross section perpendicular to the flow of the molten resin 1. As described above, the bottom surface of the bowl-shaped member 4 is inclined so that the central portion is lower than the peripheral edge portion, whereby the molten resin 1 poured from the bowl-shaped member 4 is first centered on the lower surface thereof. The surface contacts the surface of the mold 5 at the part, and then the contact surface gradually spreads from the central part to the peripheral part. Thereby, the air in contact with the lower side of the molten resin 1 is effectively excluded, and the air can be prevented from being caught between the molten resin 1 and the mold 5.

図３に、本発明に基づく樹脂成形装置で使用される樋状の部材の具体的な形状の例を示す。図４に、この樋状の部材４をＴダイ３の前方に取り付けた状態を示す。この例では、樋状の部材４の底面の断面形状が、中央部が周縁部よりも低くなるように、Ｖ字状に形成されている（開きの角度１７１．６°）。それに加えて、この例では、樋状の部材４の先端部の平面形状（水平面への投影形状）が、中央部が周縁部よりも後退するようにＶ字状に形成されている（開きの角度１６２．８°）。樋状の部材４の先端部の形状をこのように構成することによって、樋状の部材４から流し込まれた溶融樹脂１が、最初にその下面の中央部で金型５の表面に接触し、次いで、接触面が中央部から周縁部に徐々に広がって行く状態を実現することができる。   In FIG. 3, the example of the specific shape of the bowl-shaped member used with the resin molding apparatus based on this invention is shown. FIG. 4 shows a state in which this bowl-shaped member 4 is attached to the front of the T die 3. In this example, the cross-sectional shape of the bottom surface of the bowl-shaped member 4 is formed in a V shape so that the central portion is lower than the peripheral portion (opening angle: 171.6 °). In addition, in this example, the planar shape (projection shape onto the horizontal plane) of the tip of the bowl-shaped member 4 is formed in a V shape so that the center part is set back from the peripheral part (opening). Angle 162.8 °). By configuring the shape of the tip of the bowl-shaped member 4 in this way, the molten resin 1 poured from the bowl-shaped member 4 first comes into contact with the surface of the mold 5 at the center of the lower surface thereof, Next, it is possible to realize a state in which the contact surface gradually spreads from the central portion to the peripheral portion.

なお、以上の例では、樋状の部材４の底面の断面形状をＶ字状に形成しているが、底面の断面形状を曲面で形成し、且つ中央部が周縁部よりも低くなるように傾斜を与えても良い。   In the above example, the cross-sectional shape of the bottom surface of the bowl-shaped member 4 is formed in a V shape, but the cross-sectional shape of the bottom surface is formed as a curved surface, and the central portion is lower than the peripheral portion. An inclination may be given.

樋状の部材４には、溶融樹脂１が接触した際に固化しないようヒ一夕ー等を取付けるのが好ましい。また、溶融樹脂１が樋状の部材４に貼りつかないように、表面にコーティングやめっき等の処理を施すのが好ましい。   It is preferable to attach a haze or the like to the bowl-shaped member 4 so that it does not solidify when the molten resin 1 comes into contact. Moreover, it is preferable that the surface is subjected to a treatment such as coating or plating so that the molten resin 1 does not stick to the bowl-shaped member 4.

本発明に基づく樹脂成形装置の全体概要を示す図。The figure which shows the whole outline | summary of the resin molding apparatus based on this invention. 本発明に基づく樹脂成形装置で使用される樋状の部材の例を示す図。The figure which shows the example of the bowl-shaped member used with the resin molding apparatus based on this invention. 本発明に基づく樹脂成形装置で使用される樋状の部材の具体的な形状の例を示す図。The figure which shows the example of the specific shape of the bowl-shaped member used with the resin molding apparatus based on this invention. 図３に示した樋状の部材をＴダイの前方に取り付けた状態を示す図。The figure which shows the state which attached the bowl-shaped member shown in FIG. 3 to the front of T-die. 従来の樹脂成形装置で使用されている樋状の部材の例を示す図。The figure which shows the example of the bowl-shaped member currently used with the conventional resin molding apparatus.

符号の説明Explanation of symbols

１・・・溶融樹脂、２・・・バレル、３・・・Ｔダイ、４・・・樋状の部材、５、６・・・金型、１０・・・射出装置、２０・・・型締装置、３０・・・架台、４０・・・移動装置。   DESCRIPTION OF SYMBOLS 1 ... Molten resin, 2 ... Barrel, 3 ... T die, 4 ... Bowl-shaped member, 5, 6 ... Mold, 10 ... Injection apparatus, 20 ... Mold Fastening device, 30 ... gantry, 40 ... moving device.

Claims (3)

吐出口にＴダイが設けられた射出装置を用いて、Ｔダイを介して金型上に溶融樹脂を吐出し、次いで型締めを行うことにより、樹脂製品を成形する樹脂成形装置において、
Ｔダイの下側に、Ｔダイから吐出された溶融樹脂を受けて金型上に流し込む樋状の部材を配置するとともに、この部材の底面に、溶融樹脂の流れに対して垂直方向の断面において中央部が周縁部よりも低くなるように傾斜を与えたことを特徴とする樹脂成形装置。 In a resin molding apparatus for molding a resin product by discharging a molten resin onto a mold through a T die using an injection device provided with a T die at a discharge port, and then performing mold clamping.
A trough-shaped member that receives the molten resin discharged from the T die and flows onto the mold is disposed below the T die, and the bottom surface of the member has a cross section perpendicular to the flow of the molten resin. A resin molding apparatus characterized in that an inclination is given so that a central part is lower than a peripheral part. 前記樋状の部材は、その底面の断面形状がＶ字状に形成されていることを特徴とする請求項１に記載の樹脂成形装置。   The resin molding apparatus according to claim 1, wherein a cross-sectional shape of the bottom surface of the bowl-shaped member is V-shaped. 前記樋状の部材は、その先端部の平面形状が、中央部が周縁部よりも後退するようにＶ字状に形成されていることを特徴とする請求項２に記載の樹脂成形装置。   3. The resin molding apparatus according to claim 2, wherein the flange-shaped member is formed in a V shape so that a central portion of the planar shape of the front end portion is retracted from a peripheral edge portion.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007168239A (en) * 2005-12-21 2007-07-05 Toshiba Mach Co Ltd Resin molding machine

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63115708A (en) * 1986-11-04 1988-05-20 Idemitsu Petrochem Co Ltd Pressure molding method and its equipment
JPH0872082A (en) * 1994-09-05 1996-03-19 Kubota Corp Manufacture for fiber reinforced plastic molded part
JP2003191263A (en) * 2001-12-27 2003-07-08 Nippon Zeon Co Ltd Flat panel and method for manufacturing the same

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63115708A (en) * 1986-11-04 1988-05-20 Idemitsu Petrochem Co Ltd Pressure molding method and its equipment
JPH0872082A (en) * 1994-09-05 1996-03-19 Kubota Corp Manufacture for fiber reinforced plastic molded part
JP2003191263A (en) * 2001-12-27 2003-07-08 Nippon Zeon Co Ltd Flat panel and method for manufacturing the same

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007168239A (en) * 2005-12-21 2007-07-05 Toshiba Mach Co Ltd Resin molding machine

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