JP2009269182A - Plasticization and delivery device for molding material and injection molding machine using it - Google Patents

Plasticization and delivery device for molding material and injection molding machine using it Download PDF

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Publication number
JP2009269182A
JP2009269182A JP2008118765A JP2008118765A JP2009269182A JP 2009269182 A JP2009269182 A JP 2009269182A JP 2008118765 A JP2008118765 A JP 2008118765A JP 2008118765 A JP2008118765 A JP 2008118765A JP 2009269182 A JP2009269182 A JP 2009269182A
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Prior art keywords
plasticizing
spiral groove
molding material
rotor
delivery device
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JP2008118765A
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Japanese (ja)
Inventor
Naoki Kawakubo
直樹 川久保
Toshiteru Oike
俊輝 大池
Yukio Yoshida
幸雄 葭田
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Canon Electronics Inc
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Canon Electronics Inc
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Application filed by Canon Electronics Inc filed Critical Canon Electronics Inc
Priority to JP2008118765A priority Critical patent/JP2009269182A/en
Publication of JP2009269182A publication Critical patent/JP2009269182A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B7/00—Mixing; Kneading
    • B29B7/30—Mixing; Kneading continuous, with mechanical mixing or kneading devices
    • B29B7/34—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices
    • B29B7/38—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary
    • B29B7/40—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with single shaft
    • B29B7/401—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with single shaft having a casing closely surrounding the rotor, e.g. with a plunger for feeding the material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B7/00—Mixing; Kneading
    • B29B7/30—Mixing; Kneading continuous, with mechanical mixing or kneading devices
    • B29B7/34—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices
    • B29B7/38—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary
    • B29B7/40—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with single shaft
    • B29B7/402—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with single shaft using a rotor-stator system with intermeshing elements, e.g. teeth
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B7/00—Mixing; Kneading
    • B29B7/30—Mixing; Kneading continuous, with mechanical mixing or kneading devices
    • B29B7/34—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices
    • B29B7/38—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary
    • B29B7/40—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with single shaft
    • B29B7/405—Mixing heads
    • B29B7/407—Mixing heads with a casing closely surrounding the rotor, e.g. with conical rotor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B7/00—Mixing; Kneading
    • B29B7/30—Mixing; Kneading continuous, with mechanical mixing or kneading devices
    • B29B7/34—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices
    • B29B7/38—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary
    • B29B7/40—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with single shaft
    • B29B7/405—Mixing heads
    • B29B7/408—Mixing heads with mixing elements on a rotor co-operating with mixing elements, perpendicular to the axis of the rotor, fixed on a stator
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B7/00—Mixing; Kneading
    • B29B7/30—Mixing; Kneading continuous, with mechanical mixing or kneading devices
    • B29B7/34—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices
    • B29B7/38—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary
    • B29B7/40—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with single shaft
    • B29B7/42—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with single shaft with screw or helix
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B7/00—Mixing; Kneading
    • B29B7/80—Component parts, details or accessories; Auxiliary operations
    • B29B7/82—Heating or cooling
    • B29B7/826—Apparatus therefor

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem of conventional plasticized delivery device of injection molding machines that they tend to cause accompanying motion of the molding material by corotation of the rotor and/or the screw constituting the spiral groove for supply of the molding material, failing in achievment of smooth delivery. <P>SOLUTION: The plasticization and delivery device 15 has a rotating rotor 24 having a spiral groove 32, a barrel 23 having an end surface 23<SB>F</SB>with which the rotor 24 slides and a heating means 26 for heating the molding material. It delivers a plasticized molding material to the cavity 13 of a mold unit 11 by rotating the rotor 24 while heating the molding material to be supplied into the spiral groove 32 of the rotor 24 by the heating means 26 so as to plastisize. It has, on the end surface 23<SB>F</SB>of the barrel 23, an accompanying motion controlling groove 28 which controls accompanying motion of the resin within the spiral groove 32 of the rotor 24 associated with rotation of the rotor 24. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、成形材料を可塑化して金型のキャビティ側へと送出するための可塑化送出装置およびこの可塑化送出装置を含む射出成形機に関する。   The present invention relates to a plasticizing delivery device for plasticizing a molding material and delivering it to the cavity side of a mold, and an injection molding machine including this plasticizing delivery device.

近年、射出成形機の小型化を企図して在来のスクリューをロータに置き換えた特許文献１に示すようないわゆるスクロール型の射出成形機が提案されている。この射出成形機は、所定量の溶融樹脂を金型のキャビティに圧送する計量射出部と、成形材料である樹脂を可塑化してこれを計量射出部に送出する可塑化送出部とを含む点で在来のものと同じである。しかしながら、可塑化送出部は、射出ノズルに連通する樹脂流入通路が一端面に開口するバレルと、このバレルの一端面に摺接する端面を持ったロータとを有している。このロータの端面には、外側端部から樹脂が供給されると共に内側端部がバレルの樹脂流入通路に連通するように、バレルの一端面との間に樹脂の可塑化混練通路を画成する螺旋溝が形成されている。ロータは、その端面をバレルの一端面に対して摺接させた状態で駆動回転し、ペレット状の樹脂をロータの外周側から螺旋溝の外側端部に供給する。供給された樹脂は、加熱されたバレルにより軟化溶融しつつロータの回転に伴って混練されながら螺旋溝の内側端部へと次第に流動してバレルの樹脂流入通路へと送出される。送出された樹脂は、計量射出部から所定量ずつ金型のキャビティへと圧送され、所定形状の成形品が射出される。   In recent years, a so-called scroll-type injection molding machine as shown in Patent Document 1 in which a conventional screw is replaced with a rotor in order to reduce the size of an injection molding machine has been proposed. This injection molding machine includes a metering injection unit that pumps a predetermined amount of molten resin into a cavity of a mold, and a plasticizing sending unit that plasticizes a resin that is a molding material and sends it to the metering injection unit. It is the same as the conventional one. However, the plasticizing delivery section has a barrel in which a resin inflow passage communicating with the injection nozzle is opened at one end face, and a rotor having an end face that is in sliding contact with one end face of the barrel. A resin plasticizing and kneading passage is defined between one end surface of the barrel and the end surface of the rotor so that the resin is supplied from the outer end portion and the inner end portion communicates with the resin inflow passage of the barrel. A spiral groove is formed. The rotor is driven and rotated in a state where its end surface is in sliding contact with one end surface of the barrel, and pellet-shaped resin is supplied from the outer peripheral side of the rotor to the outer end of the spiral groove. The supplied resin is softened and melted by the heated barrel and gradually flows to the inner end of the spiral groove while being kneaded as the rotor rotates, and is sent to the resin inflow passage of the barrel. The delivered resin is pumped by a predetermined amount from the metering injection unit to the mold cavity, and a molded product having a predetermined shape is injected.

特開２００５−３０６０２８号公報JP 2005-306028 A

特許文献１に開示された射出成形機においては、螺旋溝の外側端部から供給された樹脂が可塑化混練通路を経てバレルの樹脂流入通路へと円滑に送出されるようにしなければならない。そのためには、螺旋溝内に介在する樹脂の圧力を高めてバレルの一端面に対する樹脂の摩擦抵抗力や粘性抵抗力を増大させることが必要である。そこで、特許文献１においては、可塑化混練通路の断面積が螺旋溝の外側端部から内側端部に向けて漸次小さくなるように、螺旋溝の深さを内側端部ほど浅く設定している。また、バレルの一端面を緩やかな凸円錐状に形成すると共にこの一端面に摺接するロータの端面をバレルの一端面に対応した緩やかな凹円錐状に形成している。   In the injection molding machine disclosed in Patent Document 1, the resin supplied from the outer end portion of the spiral groove must be smoothly delivered to the resin inflow passage of the barrel through the plasticizing kneading passage. For this purpose, it is necessary to increase the pressure of the resin interposed in the spiral groove to increase the frictional resistance force and viscous resistance force of the resin against one end surface of the barrel. Therefore, in Patent Document 1, the depth of the spiral groove is set to be shallower toward the inner end so that the cross-sectional area of the plasticization kneading passage gradually decreases from the outer end to the inner end of the spiral groove. . Further, one end surface of the barrel is formed in a gentle convex cone shape, and the end surface of the rotor that is in sliding contact with the one end surface is formed in a gentle concave cone shape corresponding to the one end surface of the barrel.

しかしながら、上述した特許文献１に開示された技術を用いたとしても、樹脂の種類などによってはバレルの一端面に対して充分な摩擦抵抗力や粘性抵抗力を得られない場合があった。このような場合、可塑化混練通路内に介在する樹脂がロータの回転に伴って連れ回りし、つまり可塑化混練通路内を移動せずに滞留状態となってしまい、樹脂をバレルの樹脂流入通路へと正常に送出することができなくなってしまう。さらに、計量射出部への可塑化した樹脂の供給速度が低下するため、成形作業におけるサイクルタイムが延びたり、ショートショットなどの成形不良を招くなどの問題が生ずる。   However, even if the technique disclosed in Patent Document 1 described above is used, there are cases where sufficient frictional resistance force or viscous resistance force cannot be obtained with respect to one end face of the barrel depending on the type of resin. In such a case, the resin intervening in the plasticizing kneading passage is rotated along with the rotation of the rotor, that is, the resin stays in the plasticizing kneading passage without moving in the plasticizing kneading passage. It will not be possible to send normally. Furthermore, since the supply rate of the plasticized resin to the metering injection part is lowered, there arises a problem that the cycle time in the molding operation is extended and molding defects such as short shots are caused.

本発明の目的は、バレルとロータとを用いた射出成形機の可塑化送出部において、可塑化混練通路内に介在する樹脂がロータの回転に伴って連れ回りするのを抑制し得る可塑化送出装置を提供することにある。   An object of the present invention is to provide a plasticizing and feeding that can suppress the resin intervening in the plasticizing and kneading passage from rotating along with the rotation of the rotor in a plasticizing and feeding section of an injection molding machine using a barrel and a rotor. To provide an apparatus.

また、このような可塑化送出装置が組み込まれた射出成形機を提供することも本発明の目的に含まれる。   It is also included in the object of the present invention to provide an injection molding machine incorporating such a plasticizing delivery device.

本発明の第１の形態は、螺旋溝が画成され、かつ回転する第１の部材と、この第１の部材が摺接する摺接面を有する第２の部材と、成形材料を加熱するための加熱手段とを具え、前記第１の部材の螺旋溝内に供給される成形材料を前記加熱手段により加熱して可塑化させながら前記第１の部材を回転することにより、可塑化された成形材料を金型のキャビティ側へと送出するための可塑化送出装置であって、前記第１の部材の回転に伴い、この第１の部材の螺旋溝内に介在する材料の連れ回りを抑制するための連れ回り抑制部が前記第２の部材の摺接面に形成されていることを特徴とするものである。   In the first aspect of the present invention, a spiral groove is defined and a first member that rotates, a second member having a sliding contact surface with which the first member slides, and a molding material are heated. And a plasticized molding by rotating the first member while plasticizing the molding material supplied into the spiral groove of the first member by heating with the heating means. A plasticizing delivery device for delivering a material to a cavity side of a mold, wherein the rotation of the first member suppresses the accompanying rotation of the material interposed in the spiral groove of the first member. For this purpose, a follow-up suppressing portion is formed on the sliding contact surface of the second member.

本発明において、第１の部材の螺旋溝内に供給される成形材料は、この第１の部材の回転に伴って、螺旋溝内を移動する。この時、第１の部材の回転に伴い、螺旋溝内に介在する成形材料の連れ回りが第２の部材の摺接面に形成された連れ回り抑制部により抑制される結果、成形材料はこの螺旋溝内を円滑に移動する。そして、この移動中に加熱手段により加熱され、次第に軟化溶融して混練され、金型のキャビティ側へ送給される。   In the present invention, the molding material supplied into the spiral groove of the first member moves in the spiral groove as the first member rotates. At this time, as the first member rotates, the accompanying rotation of the molding material interposed in the spiral groove is suppressed by the accompanying rotation suppressing portion formed on the sliding contact surface of the second member. Moves smoothly in the spiral groove. And during this movement, it is heated by the heating means, gradually softened and melted and kneaded, and fed to the cavity side of the mold.

本発明の第１の形態による可塑化送出装置において、連れ回り抑制部が螺旋溝を横切るように延在する複数の溝を含むものであってよい。この場合、個々の溝の幅を成形材料の寸法よりも小さく設定することが有効である。また、個々の溝の深さを螺旋溝の下流側ほど浅く設定することが好ましい。   The plasticizing delivery apparatus according to the first aspect of the present invention may include a plurality of grooves that extend so that the follow-up restraining part crosses the spiral groove. In this case, it is effective to set the width of each groove smaller than the dimension of the molding material. Moreover, it is preferable that the depth of each groove is set to be shallower toward the downstream side of the spiral groove.

連れ回り抑制部を螺旋溝の上流側と対向する摺接面の部分にのみ形成することができる。   The follow-up suppressing portion can be formed only on the portion of the sliding contact surface facing the upstream side of the spiral groove.

連れ回り抑制部が成形材料の寸法よりも小さな表面粗さを持つ粗面を含むものであってよい。   The follow-up suppressing portion may include a rough surface having a surface roughness smaller than the dimension of the molding material.

第１の部材がその回転軸線の半径方向に延在するような螺旋溝を持つロータであり、第２の部材が円形となった摺接面を持つバレルであってよい。   The first member may be a rotor having a spiral groove extending in the radial direction of the rotation axis thereof, and the second member may be a barrel having a circular sliding contact surface.

あるいは、第１の部材がその回転軸線の長手方向に延在するような螺旋溝を持つスクリューであり、第２の部材が円筒形となった摺接面を持つシリンダであってよい。   Alternatively, the first member may be a screw having a spiral groove extending in the longitudinal direction of the rotation axis, and the second member may be a cylinder having a slidable contact surface in a cylindrical shape.

本発明の第２の形態は、所定量の成形材料を金型のキャビティ内に射出する計量射出部と、成形材料を可塑化して前記計量射出部に送出する可塑化送出部とを具えた射出成形機であって、前記可塑化送出部が本発明の第１の形態による可塑化送出装置を含んでいることを特徴とするものである。   The second aspect of the present invention is an injection comprising a metering injection part for injecting a predetermined amount of molding material into a cavity of a mold and a plasticizing sending part for plasticizing the molding material and sending it to the metering injection part. In the molding machine, the plasticizing and feeding unit includes the plasticizing and feeding device according to the first aspect of the present invention.

本発明の可塑化送出装置によると、第１の部材の回転に伴い、この第１の部材の螺旋溝内に介在する材料の連れ回りを抑制するための連れ回り抑制部を第２の部材の摺接面に形成したので、ロータの回転に伴う成形材料の連れ回りを抑制することができる。この結果、螺旋溝内に介在する成形材料の圧力が高まって単位時間当たりの成形材料の送出量を増大させることができる。   According to the plasticizing delivery device of the present invention, the rotation suppressing portion for suppressing the rotation of the material interposed in the spiral groove of the first member as the first member rotates is provided on the second member. Since it formed in the slidable contact surface, the accompanying rotation of the molding material accompanying rotation of a rotor can be suppressed. As a result, the pressure of the molding material interposed in the spiral groove is increased, and the amount of molding material delivered per unit time can be increased.

連れ回り抑制部が螺旋溝を横切るように延在する複数の溝を含む場合、特に、個々の溝の幅を成形材料の寸法よりも小さく設定した場合、成形材料が溝内に入り込んで滞留してしまうような不具合を未然に防止することができる。また、個々の溝の深さを螺旋溝の下流側ほど浅く設定した場合も、固形状をなす成形材料の寸法が加熱により小さくなるため、同様な効果を得ることができる。   When the follow-up restraining part includes a plurality of grooves extending so as to cross the spiral groove, particularly when the width of each groove is set smaller than the dimension of the molding material, the molding material enters the groove and stays in the groove. It is possible to prevent problems that may occur. Also, when the depth of each groove is set to be shallower toward the downstream side of the spiral groove, the same effect can be obtained because the dimension of the solid molding material is reduced by heating.

連れ回り抑制部を成形材料の可塑化が進んでいない螺旋溝の上流側と対向する摺接面の部分にのみ形成した場合、特に連れ回りしやすい螺旋溝の上流側に位置する成形材料に対して有効となる。   When the follow-up restraining part is formed only on the portion of the sliding contact surface facing the upstream side of the spiral groove where plasticization of the molding material has not progressed, the molding material located on the upstream side of the spiral groove that is particularly easy to follow It becomes effective.

連れ回り抑制部が成形材料の寸法よりも小さな表面粗さを持つ粗面を含む場合、成形材料が溝内に入り込んで滞留してしまうような不具合を未然に防止することができる。   When the follow-up suppressing portion includes a rough surface having a surface roughness smaller than the dimension of the molding material, it is possible to prevent a problem that the molding material enters and stays in the groove.

本発明の射出成形機によると、可塑化送出部が本発明による可塑化送出装置を含んでいるので、ロータの回転に伴う成形材料の連れ回りを抑制することができる。この結果、螺旋溝内に介在する成形材料の圧力が高まって単位時間当たりの成形材料の送出量を増大させることが可能となり、成形作業のサイクルタイムを短縮することができる。   According to the injection molding machine of the present invention, since the plasticizing delivery part includes the plasticizing delivery device according to the present invention, it is possible to suppress the accompanying rotation of the molding material accompanying the rotation of the rotor. As a result, it is possible to increase the pressure of the molding material interposed in the spiral groove and increase the amount of the molding material delivered per unit time, thereby shortening the cycle time of the molding operation.

本発明による射出成形機を特許文献１に示すようなスクロール型のものに応用した一実施形態について、図１〜図１１を参照しながら詳細に説明する。   An embodiment in which an injection molding machine according to the present invention is applied to a scroll type machine as shown in Patent Document 1 will be described in detail with reference to FIGS.

まず、本実施形態における射出成形機の外観を図１に示し、その平面形状を一部破断して図２に示し、その正面形状を一部破断して図３に示す。すなわち、本実施形態における射出成形機１０は、本発明における金型としての金型ユニット１１と、この金型ユニット１１の型締めを行うための型締め装置１２とを含む。また、この射出成形機１０は、所定量の溶融樹脂を金型ユニット１１に形成されたキャビティ１３内に射出する計量射出装置１４と、本発明における成形材料としての樹脂を可塑化して計量射出装置１４に送出する可塑化送出装置１５とをさらに含む。   First, the appearance of the injection molding machine in the present embodiment is shown in FIG. 1, the planar shape is partially broken and shown in FIG. 2, and the front shape is partially broken and shown in FIG. That is, the injection molding machine 10 in the present embodiment includes a mold unit 11 as a mold in the present invention and a mold clamping device 12 for performing mold clamping of the mold unit 11. The injection molding machine 10 includes a metering injection device 14 for injecting a predetermined amount of molten resin into a cavity 13 formed in the mold unit 11, and a metering injection device by plasticizing a resin as a molding material in the present invention. And a plasticizing delivery device 15 for delivery to 14.

本実施形態における金型ユニット１１は、固定側金型１１Sと、可動側金型１１Mとを有し、これらの間に成形品の形状に対応したキャビティ１３が画成される。 The mold unit 11 in the present embodiment has a fixed mold 11 S and a movable mold 11 M, and a cavity 13 corresponding to the shape of the molded product is defined between them.

本実施形態における型締め装置１２は、ベース１６と、このベース１６に取り付けられた型締め用モータ１７と、可動側ダイプレート１８と、この可動側ダイプレート１８と型締め用モータ１７とを機械的に接続するボールねじ機構１９とを含む。金型ユニット１１の可動側金型１１Mを保持する可動側ダイプレート１８は、ベース１６に突設された支柱２０に対して摺動自在に嵌合されている。ボールねじ機構１９は、型締め用モータ１７に連結されるボールねじ軸１９Aと、可動側ダイプレート１８に取り付けられるボールナット１９Nとを含む。 The mold clamping device 12 in this embodiment includes a base 16, a mold clamping motor 17 attached to the base 16, a movable side die plate 18, and the movable side die plate 18 and the mold clamping motor 17. And a ball screw mechanism 19 to be connected to each other. The movable side die plate 18 that holds the movable side mold 11 M of the mold unit 11 is slidably fitted to a support column 20 protruding from the base 16. The ball screw mechanism 19 includes a ball screw shaft 19 A connected to the mold clamping motor 17 and a ball nut 19 N attached to the movable die plate 18.

従って、型締め用モータ１７を駆動することにより、可動側ダイプレート１８を可動側金型１１Mと共に支柱２０に沿って移動させることができる。より具体的には、型締め操作の場合、可動側金型１１Mを固定側金型１１Sに所定圧力で押し当て、型開き操作の場合、可動側金型１１Mを固定側金型１１Sから引き離す。 Therefore, by driving the mold clamping motor 17, it is possible to move the movable die plate 18 with the movable mold 11 M along the column 20. More specifically, when the mold clamping operation, pressing the movable mold 11 M to the fixed mold 11 S at a predetermined pressure, if the mold opening operation, the fixed mold and movable mold 11 M 11 Pull away from S.

なお、可動側ダイプレート１８には、成形品を可動側金型１１Mから取り出すためのエジェクタ装置２１が組み込まれている。これら金型ユニット１１や型締め装置１２およびエジェクタ装置２１に関しては、既知の射出成形機と同じ構成のものや、特許文献１に開示されたものと同じ構成を採用することが可能である。 Note that the movable die plate 18, ejector 21 for taking out a molded product from the movable mold 11 M is incorporated. Regarding the mold unit 11, the mold clamping device 12, and the ejector device 21, it is possible to adopt the same configuration as a known injection molding machine or the same configuration as that disclosed in Patent Document 1.

本発明における可塑化送出部としての可塑化送出装置１５は、ケーシング２２に収容されるバレル２３と、ロータ２４と、ロータ駆動手段２５と、加熱手段２６とを含む。   The plasticizing delivery device 15 as a plasticizing delivery unit in the present invention includes a barrel 23 accommodated in a casing 22, a rotor 24, a rotor driving means 25, and a heating means 26.

図２に示した可塑化送出装置１５を計量射出装置１４と共に抽出拡大して図４に示し、本実施形態におけるバレルの外観を図５に示す。すなわち、本実施形態におけるバレル２３は、樹脂流入通路２７が一端面２３Fの中央部に開口し、本実施形態ではこの一端面２３Fが傾斜の非常に緩やかな凸円錐面にて形成されている。バレル２３の一端面２３F側の樹脂流入通路２７の開口端部は、その内径がロータ２４側に向けて次第に拡がる漏斗状となっている。 The plasticizing delivery device 15 shown in FIG. 2 is extracted and enlarged together with the metering injection device 14 and shown in FIG. 4, and the external appearance of the barrel in this embodiment is shown in FIG. That is, the barrel 23 in the present embodiment, the resin inflow passage 27 is opened in the center of one end surface 23 F, in this embodiment the end surface 23 F is formed in a very gentle convex conical surface of the inclined Yes. The opening end of the resin inflow passage 27 on the one end face 23 F side of the barrel 23 has a funnel shape in which the inner diameter gradually expands toward the rotor 24 side.

バレル２３の一端面２３Fにおいて、可塑化の進んでいない樹脂が介在する可能性の高い外周部には、円周方向に沿って等間隔に配列する複数の連れ回り抑制溝２８が樹脂流入通路２７を中心として放射状に形成されている。本発明における連れ回り抑制部として機能する個々の連れ回り抑制溝２８の幅は、ここを通過するペレット状または粒状をなす成型材料の寸法よりも小さく設定され、その深さも同様に、ここを通過する固形状をなす樹脂の寸法より浅く設定されている。これら連れ回り抑制溝２８の断面形状は半円形状やＵ字状，Ｖ字状の他に非対称形状など、任意の形状を選択し得るものであるが、樹脂が滞留しにくい形状であることが好ましいと言えよう。本実施形態では、バレル２３の径方向内側、つまり樹脂流入通路２７側ほど連れ回り抑制溝２８の深さが漸次浅くなるように設定しているが、この連れ回り抑制溝２８に関しては後で詳述する。 In one end face 23 F of the barrel 23, the high outer periphery might resin not progressed the plasticization is interposed a plurality of drag motion suppression groove 28 resin inlet passages arranged at equal intervals along the circumferential direction 27 is formed radially. In the present invention, the width of each follow-up restraining groove 28 that functions as a follow-up restraining portion is set to be smaller than the size of the molding material that forms a pellet-like or granular shape that passes through this groove, and the depth thereof also passes through here. It is set shallower than the dimensions of the solid resin. The cross-sectional shape of the follow-up suppression groove 28 can be selected from any shape such as a semicircular shape, U-shape, V-shape, or asymmetric shape, but the shape is difficult for the resin to stay. It can be said that it is preferable. In the present embodiment, the depth of the follow-up suppressing groove 28 is set so as to gradually decrease toward the radially inner side of the barrel 23, that is, the resin inflow passage 27 side. Describe.

前記樹脂流入通路２７の途中には、逆止め弁２９が組み込まれている。この逆止め弁２９は、後述する可塑化混練通路３０側から樹脂が供給されるチャンバ３１と樹脂流入通路２７との接続部分よりも樹脂流入通路２７の上流側に配され、チャンバ３１側から可塑化混練通路３０側への溶融樹脂の逆流を防止する。本実施形態における逆止め弁２９は、バレル２３の一端面２３F側の樹脂流入通路２７の開口端部を塞ぎ得る弁体２９Bと、この弁体２９Bを樹脂流入通路２７の長手方向（図４中、上下方向）に沿って摺動自在に保持するスリーブ２９Sとを具えている。内周側が樹脂流入通路２７を画成するスリーブ２９Sは、バレル２３に対して一体的に嵌着されている。このスリーブ２９Sの一端部には、弁体２９Bの摺動方向に沿って延在して樹脂流入通路２７の一部を画成する複数本の切欠き部２９Cがこの弁体２９Bを囲むように形成されている。 A check valve 29 is incorporated in the resin inflow passage 27. The check valve 29 is arranged on the upstream side of the resin inflow passage 27 from the connection portion between the resin inflow passage 27 and the chamber 31 to which the resin is supplied from the plasticization kneading passage 30 side described later. The backflow of the molten resin to the chemical kneading passage 30 side is prevented. In the present embodiment, the check valve 29 includes a valve body 29 B that can block the opening end of the resin inflow passage 27 on the one end face 23 F side of the barrel 23, and the valve body 29 B in the longitudinal direction of the resin inflow passage 27 ( 4 is provided with a sleeve 29 S that is slidably held along the vertical direction in FIG. A sleeve 29 S whose inner peripheral side defines a resin inflow passage 27 is integrally fitted to the barrel 23. At one end of the sleeve 29 S, the valve element 29 a plurality of notches 29 C is the valve body 29 B that defines a portion of the resin inflow passage 27 extends along the sliding direction of the B Is formed so as to surround.

ケーシング２２内に回転自在に収容された本実施形態におけるロータ２４は、バレル２３の一端面２３Fに摺接する端面２４Fを有し、従って、この端面２４Fはバレル２３の凸円錐面と対応した傾斜の非常に緩やかな凹円錐面にて形成されている。このように、バレル２３の一端面２３Fを凸円錐面に形成すると共にロータ２４の端面２４Fをこれと対応する凹円錐面に形成したことにより、可塑化混練通路３０内に介在する樹脂をより円滑にロータ２４の回転中心側へと付勢することができる。 The rotor 24 in the present embodiment that is rotatably accommodated in the casing 22 has an end surface 24 F that is in sliding contact with one end surface 23 F of the barrel 23, and therefore this end surface 24 F corresponds to the convex conical surface of the barrel 23. It is formed by a concave conical surface with a very gentle slope. Thus, by the end face 24 F of the rotor 24 is formed in a corresponding concave conical surface with which to form a one end face 23 F of the barrel 23 in a convex conical surface, the resin intervening plasticization kneading passage 30 The rotor 24 can be urged more smoothly toward the rotation center side.

このロータ２４の外観を１８０度反転して図６に示し、その正面形状を図７に示し、図４に示したロータ２４の部分を抽出して図８に示す。このロータ２４の端面２４Fには、その回転軸線の半径方向に延在する螺旋溝３２が形成され、バレル２３の一端面２３Fとの間に樹脂の可塑化混練通路３０を画成する。この螺旋溝３２は、外側端部３２Oから樹脂が供給されると共に内側端部３２Iがバレル２３の樹脂流入通路２７の開口端に連通するようになっている。本実施形態における螺旋溝３２は、ロータ２４の回転軸線を中心とし、かつ樹脂流入通路２７の内径に等しい円を基準とするインボリュート曲線に沿って形成され、かつその幅がほぼ一定に設定されている。つまり、本実施形態の螺旋溝３２においては、ロータ２４の回転中心を通る任意の径方向直線に対してこれを横切る螺旋溝３２の間隔、つまりピッチがすべて等しくなる。この螺旋溝３２は、ロータ２４の端面２４Fと向き合った場合、その外側端部３２Oから右回り（時計回り）で内側端部３２Iへと旋回するような螺旋状となっている。より具体的には、螺旋溝３２の外側端部３２Oから内側端部３２Iへと向かう方向をロータ２４の回転方向に対して逆方向に設定している。このように、螺旋溝３２をインボリュート曲線にて形成し、かつその幅をほぼ一定に設定したことにより、次のような利点が生ずる。すなわち、ロータ２４の回転に伴い、ロータ２４の回転中心を通る任意の径方向直線を横切る螺旋溝３２内の樹脂が、見掛け上、ロータ２４の回転中心、つまりバレル２３の連通溝２７に向かって等速で移動することとなる。この結果、樹脂を可塑化混練通路３０内で円滑に流動させることが可能となる。 The appearance of the rotor 24 is inverted 180 degrees and shown in FIG. 6, the front shape thereof is shown in FIG. 7, and the portion of the rotor 24 shown in FIG. 4 is extracted and shown in FIG. This end face 24 F of the rotor 24, the helical grooves 32 extending radially of the rotational axis are formed to define a plasticizing kneading passage 30 of the resin between the one end face 23 F of the barrel 23. The spiral groove 32 is supplied with resin from the outer end portion 32 O, and the inner end portion 32 I communicates with the open end of the resin inflow passage 27 of the barrel 23. The spiral groove 32 in the present embodiment is formed along an involute curve centered on the rotation axis of the rotor 24 and based on a circle equal to the inner diameter of the resin inflow passage 27, and the width thereof is set to be substantially constant. Yes. That is, in the spiral groove 32 of the present embodiment, the intervals, that is, the pitches of the spiral grooves 32 that cross the arbitrary radial straight line passing through the rotation center of the rotor 24 are all equal. When the spiral groove 32 faces the end surface 24 F of the rotor 24, the spiral groove 32 spirals in a clockwise direction (clockwise) from the outer end portion 32 O to the inner end portion 32 I. More specifically, the direction from the outer end 32 O to the inner end 32 I of the spiral groove 32 is set to be opposite to the rotation direction of the rotor 24. As described above, the spiral groove 32 is formed by an involute curve, and the width thereof is set to be almost constant, thereby providing the following advantages. That is, as the rotor 24 rotates, the resin in the spiral groove 32 that crosses an arbitrary radial straight line passing through the rotation center of the rotor 24 apparently moves toward the rotation center of the rotor 24, that is, the communication groove 27 of the barrel 23. It will move at a constant speed. As a result, the resin can smoothly flow in the plasticizing kneading passage 30.

また、本実施形態では可塑化混練通路３０の断面積を螺旋溝３２の内側端部３２Iほど小さく設定し、より具体的には螺旋溝３２の深さをその内側端部３２Iほど浅く設定している。このように、可塑化混練通路３０の断面積が螺旋溝３２の内側端部３２Iほど小さくなるように設定した場合、螺旋溝３２の内側端部３２Iに向けて可塑化混練通路３０内を移動中の軟化溶融した樹脂が次第に圧縮力を受けることとなる。この結果、軟化溶融した樹脂の混練効果をさらに高めることができる。 In this embodiment, the cross-sectional area of the plasticizing kneading passage 30 is set to be smaller as the inner end portion 32 I of the spiral groove 32, and more specifically, the depth of the spiral groove 32 is set to be shallower as the inner end portion 32 I thereof. is doing. As described above, when the cross-sectional area of the plasticizing kneading passage 30 is set to be smaller as the inner end portion 32 I of the spiral groove 32, the inside of the plasticizing kneading passage 30 is directed toward the inner end portion 32 I of the spiral groove 32. The softened and melted resin being moved gradually receives a compressive force. As a result, the kneading effect of the softened and melted resin can be further enhanced.

本実施形態におけるロータ２４の端面２４Fの回転中心部には、バレル２３の樹脂流入通路２７側に突出する樹脂滞留阻止部３３が形成され、その先端が樹脂流入通路２７の開口端よりもその奥側（逆止め弁２９側）に突出している。この樹脂滞留阻止部３３は、ロータ２４の回転軸線を中心とする陣笠状曲面を有し、螺旋溝３２の内側端部３２Iに対して滑らかにつながっている。このように、本実施形態では樹脂滞留阻止部３３がロータ２４の回転軸線を中心とする円錐状曲面を有すると共に螺旋溝３２の内側端部３２Iに対して滑らかにつながっているため、次のような利点を有する。すなわち、軟化溶融した樹脂が樹脂滞留阻止部３３と螺旋溝３２の内側端部３２Iとによって形成される流路に沿って流動するため、可塑化混練通路３０内にて軟化溶融した樹脂の滞留をより確実に抑制することができる。この結果、可塑化した樹脂を可塑化混練通路３０から樹脂流入通路２７へと円滑に送出させることができる。 In the present embodiment, the rotation center portion of the end surface 24 F of the rotor 24 is formed with a resin retention preventing portion 33 projecting toward the resin inflow passage 27 side of the barrel 23, and its tip is more than the opening end of the resin inflow passage 27. It protrudes to the back side (check valve 29 side). The resin retention preventing portion 33 has a Jinkasa-shaped curved surface centered on the rotation axis of the rotor 24 and is smoothly connected to the inner end portion 32 I of the spiral groove 32. Thus, in this embodiment, since the smoothly connected to the inner end portion 32 I of the spiral groove 32 with the resin residence blocking portion 33 has a conical curved surface centered on the rotational axis of the rotor 24, the following It has the following advantages. That is, since the softened and melted resin flows along the flow path formed by the resin retention preventing portion 33 and the inner end portion 32 I of the spiral groove 32, the softened and melted resin stays in the plasticization kneading passage 30. Can be more reliably suppressed. As a result, the plasticized resin can be smoothly delivered from the plasticizing kneading passage 30 to the resin inflow passage 27.

ところで、先の連れ回り抑制溝２８は、可塑化混練通路３０内に介在する樹脂がロータ２４と一体的に回転する連れ回り現象を防止するためのものである。螺旋溝３２の径方向外側、つまりバレル２３の一端面２３Fの外周部に位置する可塑化の進んでいない樹脂は、バレル２３の一端面２３Fに対する摩擦抵抗力や粘性抵抗力が充分ではなく、ロータ２４と一体的に連れ回りしやすい傾向を持つ。連れ回り抑制溝２８は、樹脂に対するバレル２３の一端面２３Fの表面の摩擦抵抗を増大させることにより、可塑化混練通路３０内に介在する樹脂をロータ２４に対して相対移動しやすくしている。しかも、樹脂の間に介在する空気や気泡を排除するような機能も有する。しかしながら、このような連れ回り抑制溝２８は、可塑化が進んで粘性抵抗力が増大した樹脂に対しては、悪影響となる可能性がある。その理由は、連れ回り抑制溝２８に樹脂が引っ掛かって滞留してしまい、過熱による樹脂の劣化や炭化をもたらす可能性があるためである。従って、可塑化混練通路３０内の可塑化の進んでいない樹脂が介在する領域にのみ連れ回り抑制溝２８を形成することが有効であり、それ以外のバレル２３の一端面２３Fの領域は平滑な状態にしておくことが好ましいと言える。 By the way, the accompanying rotation suppressing groove 28 is for preventing the accompanying phenomenon in which the resin interposed in the plasticizing kneading passage 30 rotates integrally with the rotor 24. Resin that has not progressed in plasticity located on the outer side of the spiral groove 32 in the radial direction, that is, on the outer peripheral portion of the one end surface 23 F of the barrel 23, does not have sufficient frictional resistance or viscous resistance against the one end surface 23 F of the barrel 23. The rotor 24 tends to be integrated with the rotor 24. The follow-in suppressing groove 28 increases the frictional resistance of the surface of the one end surface 23 F of the barrel 23 against the resin, thereby facilitating the relative movement of the resin interposed in the plasticizing kneading passage 30 with respect to the rotor 24. . Moreover, it also has a function of eliminating air and air bubbles interposed between the resins. However, such a follow-up suppression groove 28 may have an adverse effect on a resin whose viscosity resistance has increased due to progress of plasticization. The reason is that the resin is caught in the follow-up restraining groove 28 and stays there, which may cause deterioration or carbonization of the resin due to overheating. Therefore, it is effective to resins not progressed a plasticizing plasticizing kneading passage 30 is formed around suppression groove 28 brought only in the area intervening region of one end face 23 F of the other barrel 23 is smooth It can be said that it is preferable to keep it in such a state.

このように、本実施形態ではバレル２３の外周部にのみ連れ回り抑制溝２８を形成し、バレル２３にロータ２４を重ね合わせた場合、連れ回り抑制溝２８が螺旋溝３２を横切るように延在した状態となっている。しかしながら、上述したような趣旨から、この形成領域はバレル２３の外周部にのみ限定されるわけではないことに注意されたい。また、スリット状の連れ回り抑制溝２８に代えてバレル２３の一端面２３Fを粗面化させることも有効であることが理解されよう。 As described above, in the present embodiment, when the rotation suppression groove 28 is formed only on the outer peripheral portion of the barrel 23 and the rotor 24 is overlapped with the barrel 23, the rotation suppression groove 28 extends so as to cross the spiral groove 32. It has become a state. However, it should be noted that this formation region is not limited to the outer peripheral portion of the barrel 23 for the purpose described above. It will be understood that it is also effective to roughen the one end surface 23 F of the barrel 23 in place of the slit-like follow-up suppressing groove 28.

このような本発明におけるバレル２３の他の実施形態における正面形状を図９〜図１１に示すが、先の実施形態と同一機能の要素にはこれと同じ符号を記すに留め、重複する説明は省略する。すなわち、図９に示した実施形態では、バレル２３の一端面のほぼ全域をブラスト加工などによって粗面化させたものである。この連れ回り抑制部３４の表面粗さは、固形状の樹脂が完全に入り込まないような粗面であることが有効である。このため、樹脂流入通路２７に近づくほど表面粗さを小さく設定しており、少なくとも樹脂流入通路２７の周囲は鏡面状態まで平滑化されている。図１０に示した実施形態では、バレル２３の外周部のみ環状をなす粗面の連れ回り抑制部３４を形成したものであり、図１１に示した実施形態では、バレル２３の外周部のみ円周方向に一定間隔で粗面の連れ回り抑制部３４を形成したものである。このような構成の場合、連れ回り抑制部３４の表面粗さを径方向に沿って変化させることなく、単一の表面粗さに設定するだけであってもよい。なお、このような粗面による連れ回り抑制部３４と、先の実施形態における連れ回り抑制溝２８とを組み合わせることも可能である。   The front shape of the barrel 23 according to another embodiment of the present invention is shown in FIG. 9 to FIG. 11, but the elements having the same functions as those of the previous embodiment are denoted by the same reference numerals, and redundant description is omitted. Omitted. That is, in the embodiment shown in FIG. 9, almost the entire end surface of the barrel 23 is roughened by blasting or the like. It is effective that the surface roughness of the follow-up suppressing portion 34 is a rough surface that does not allow solid resin to completely enter. For this reason, the surface roughness is set smaller as it approaches the resin inflow passage 27, and at least the periphery of the resin inflow passage 27 is smoothed to a mirror surface state. In the embodiment shown in FIG. 10, only the outer peripheral portion of the barrel 23 is formed with a rough surface rotation suppressing portion 34 having an annular shape. In the embodiment shown in FIG. In this example, the rough surface rotation suppressing portion 34 is formed at regular intervals in the direction. In the case of such a configuration, the surface roughness of the follow-up suppressing unit 34 may be set to a single surface roughness without changing along the radial direction. In addition, it is also possible to combine the accompanying rotation suppression part 34 by such a rough surface, and the accompanying rotation suppression groove | channel 28 in previous embodiment.

前記ロータ駆動手段２５は、ロータ２４の端面２４Fとバレル２３の一端面２３Fとが当接した状態のまま、バレル２３の樹脂流入通路２７を中心としてロータ２４を駆動回転させる。ケーシング２２に設置されてロータ駆動手段２５の一部を構成するロータ駆動モータ３５がロータ２４に機械的に連結されている。なお、このロータ２４の駆動回転による樹脂の流動原理などに関しては、特許文献１などに詳述されているように周知である。 The rotor driving means 25 drives and rotates the rotor 24 around the resin inflow passage 27 of the barrel 23 while the end surface 24 F of the rotor 24 and the one end surface 23 F of the barrel 23 are in contact with each other. A rotor drive motor 35 installed on the casing 22 and constituting a part of the rotor drive means 25 is mechanically connected to the rotor 24. The resin flow principle due to the driving rotation of the rotor 24 is well known as described in detail in Patent Document 1 and the like.

前記加熱手段２６は、樹脂流入通路２７および可塑化混練通路３０内に介在する樹脂を加熱して軟化溶融させるためのものである。本実施形態においては、バレル２３内に組み込まれたヒータがこの加熱手段２６の一部を構成する。ヒータ２６に対する通電を制御することによって、バレル２３の温度が樹脂の融点温度以上かつロータ２４の温度がバレル２３の温度以下または樹脂の融点以下となるように調整する。   The heating means 26 is for heating and softening and melting the resin interposed in the resin inflow passage 27 and the plasticizing kneading passage 30. In the present embodiment, a heater incorporated in the barrel 23 constitutes a part of the heating means 26. By controlling energization to the heater 26, the temperature of the barrel 23 is adjusted to be equal to or higher than the melting point temperature of the resin, and the temperature of the rotor 24 is adjusted to be equal to or lower than the temperature of the barrel 23 or lower than the melting point of the resin.

ペレット状をなす樹脂は、ケーシング２２に取り付けられたホッパ３６内に貯溜されており、ここからケーシング２２を介してロータ２４の螺旋溝３２の外側端部３２Oへと供給される。そして、ロータ駆動モータ３５の作動によるロータ２４の回転に伴い、バレル２３とロータ２４との間に形成された可塑化混練通路３０内を流動する。この時、バレル２３の一端面２３Fの外周部に形成された連れ回り抑制溝２８の存在により、可塑化の進んでいない樹脂がロータ２４と一体的に回転することなく、可塑化混練通路３０内を樹脂流入通路２７側へ向けて円滑に流動すると共にその脱気も促進される。この間に、加熱手段２６により樹脂の軟化溶融が進行し、バレル２３の一端面２３Fに対する樹脂の粘性抵抗が増大する結果、樹脂は圧力上昇を伴って螺旋溝３２の内側端部３２Iへと流動することとなる。 The resin in the form of pellets is stored in a hopper 36 attached to the casing 22, and is supplied from here to the outer end portion 32 O of the spiral groove 32 of the rotor 24 through the casing 22. Then, as the rotor 24 is rotated by the operation of the rotor drive motor 35, the fluid flows in the plasticizing and kneading passage 30 formed between the barrel 23 and the rotor 24. At this time, the plasticized kneading passage 30 does not rotate integrally with the rotor 24 due to the presence of the follow-up suppressing groove 28 formed in the outer peripheral portion of the one end surface 23 F of the barrel 23. The inside smoothly flows toward the resin inflow passage 27 side and its deaeration is also promoted. During this time, the softening and melting of the resin proceeds by the heating means 26 and the viscosity resistance of the resin with respect to the one end surface 23 F of the barrel 23 increases. As a result, the resin moves to the inner end portion 32 I of the spiral groove 32 with an increase in pressure. It will flow.

本発明における計量射出部としての計量射出装置１４は、固定側金型１１Sを保持する固定側ダイプレート３７と、固定側金型１１Sに挿通されるノズル３８と、射出プランジャ３９と、射出・計量用モータ４０とを含む。 Metering injecting device 14 as a metering injecting portion in the present invention includes a fixed die plate 37 which holds the fixed mold 11 S, the nozzle 38 to be inserted into the fixed mold 11 S, and the injection plunger 39, the injection -It includes a metering motor 40.

先端がキャビティ１３に臨むノズル３８は、バレル２３に形成された樹脂流入通路２７に連通する樹脂通路４１が形成されている。また、バレル２３には樹脂流入通路２７に連通するチャンバ３１がその側方に画成され、射出プランジャ３９は、このチャンバ３１に対して摺動自在に嵌合し、チャンバ３１内に介在する樹脂をノズル３８の樹脂通路４１側に所定量ずつ圧送する。射出プランジャ３９は、減速機４２および図示しない動力伝達機構を介して射出・計量用モータ４０に機械的に連結されている。   The nozzle 38 whose front end faces the cavity 13 is formed with a resin passage 41 communicating with the resin inflow passage 27 formed in the barrel 23. A chamber 31 communicating with the resin inflow passage 27 is defined on the side of the barrel 23, and an injection plunger 39 is slidably fitted to the chamber 31, and is interposed in the chamber 31. Are fed by a predetermined amount to the resin passage 41 side of the nozzle 38. The injection plunger 39 is mechanically connected to the injection / metering motor 40 via a speed reducer 42 and a power transmission mechanism (not shown).

従って、ロータ駆動モータ３５によるロータ２４の回転と、射出・計量用モータ４０の逆転駆動による射出プランジャ３９の後退動作（図４中、右方向移動）とを組み合わせ、可塑化混練通路３０から樹脂流入通路２７へと導かれた樹脂をチャンバ３１内に収容する。しかる後、射出・計量用モータ４０の正転駆動による射出プランジャ３９の前進動作（図４中、左方向移動）によって、チャンバ内３０に収容された所定量の樹脂をノズル３８から金型ユニット１１のキャビティ１３内に射出する。   Therefore, the rotation of the rotor 24 by the rotor drive motor 35 and the backward movement of the injection plunger 39 by the reverse rotation drive of the injection / metering motor 40 (moving in the right direction in FIG. 4) are combined, and the resin flows from the plasticizing kneading passage 30. The resin guided to the passage 27 is accommodated in the chamber 31. Thereafter, a predetermined amount of resin accommodated in the chamber 30 is transferred from the nozzle 38 to the mold unit 11 by the forward movement of the injection plunger 39 by the forward rotation of the injection / metering motor 40 (moving leftward in FIG. 4). Into the cavity 13.

本実施形態におけるスクロール型の射出成形機１０は、旧来のプリプラ方式の射出成形機と比較すると、可塑化送出装置１５を大幅に小型化することができるため、射出成形機１０としての全体的な小型化を企図することが可能である。しかしながら、本発明をプリプラ方式の射出成形機に適用することもできる。すなわち、プリプラ方式の射出成形機においては、螺旋溝を持つスクリューが本発明における第１の部材に対応し、このスクリューを収容する円筒状のシリンダが本発明における第２の部材に対応する。螺旋溝は、スクリューの回転軸線の長手方向に延在し、樹脂は、このスクリューに対する摺接面が円筒形となったシリンダの長手方向基端部から投入される。シリンダ内に供給された樹脂は、スクリューの回転によって螺旋溝内をシリンダの長手方向先端部の射出ノズル側へと送出される。連れ回り抑制部はスクリューに対する摺接面であるシリンダの内周壁に形成される。より具体的には、セレーション溝やスプライン溝のような直線状の溝や螺旋状の溝または粗面の如き微小な窪みなどを連れ回り抑制部として機能させることができる。もちろん、先の実施形態で説明したような構成をこの連れ回り抑制部に適用することが可能である。   The scroll-type injection molding machine 10 in the present embodiment can greatly reduce the size of the plasticizing delivery device 15 as compared with the conventional pre-plastic injection molding machine. It is possible to contemplate downsizing. However, the present invention can also be applied to a pre-plastic injection molding machine. That is, in the pre-plastic injection molding machine, the screw having the spiral groove corresponds to the first member in the present invention, and the cylindrical cylinder that accommodates the screw corresponds to the second member in the present invention. The spiral groove extends in the longitudinal direction of the rotational axis of the screw, and the resin is introduced from the longitudinal base end portion of the cylinder in which the sliding contact surface with respect to the screw is cylindrical. The resin supplied into the cylinder is sent through the spiral groove to the injection nozzle side at the tip in the longitudinal direction of the cylinder by the rotation of the screw. The follow-up suppressing portion is formed on the inner peripheral wall of the cylinder, which is a sliding contact surface with the screw. More specifically, a linear groove such as a serration groove or a spline groove, a spiral groove, or a minute depression such as a rough surface can be functioned as a follow-up suppressing portion. Of course, the configuration as described in the previous embodiment can be applied to the follow-up suppressing unit.

なお、本発明はその特許請求の範囲に記載された事項のみから解釈されるべきものであ、上述した実施形態においても、本発明の概念に包含されるあらゆる変更や修正が記載した事項以外に可能である。つまり、上述した実施形態におけるすべての事項は、本発明を限定するためのものではなく、本発明とは直接的に関係のないあらゆる構成を含め、その用途や目的などに応じて任意に変更し得るものである。   It should be noted that the present invention should be construed only from the matters described in the claims, and in the above-described embodiment, all the changes and modifications included in the concept of the present invention are other than those described. Is possible. That is, all matters in the above-described embodiment are not intended to limit the present invention, and include any configuration not directly related to the present invention. To get.

本発明による射出成形機の一実施形態の外観を表す立体投影図である。It is a three-dimensional projection figure showing the external appearance of one Embodiment of the injection molding machine by this invention. 図１に示した実施形態における主要部の内部構造を模式的に表す破断平面図ある。It is a fracture | rupture top view which represents typically the internal structure of the principal part in embodiment shown in FIG. 図１に示した実施形態における金型の部分の内部構造を模式的に表す破断正図である。FIG. 2 is a fracture front view schematically showing an internal structure of a mold portion in the embodiment shown in FIG. 1. 図２に示した主要部をさらに抽出拡大した断面図である。FIG. 3 is a cross-sectional view in which the main part shown in FIG. 2 is further extracted and enlarged. 図２，図４に示した実施形態におけるバレルの外観を表す立体投影図である。It is a three-dimensional projection figure showing the external appearance of the barrel in embodiment shown in FIG. 図２，４に示した実施形態におけるロータを１８０度反転してその外観を表す立体投影図である。FIG. 5 is a three-dimensional projection view showing the appearance of the rotor in the embodiment shown in FIGS. 図６に示したロータの正面図である。It is a front view of the rotor shown in FIG. 図４に示したロータの部分を抽出した断面図である。It is sectional drawing which extracted the part of the rotor shown in FIG. バレルの他の実施形態を示す正面図である。It is a front view which shows other embodiment of a barrel. バレルの別な実施形態を示す正面図である。It is a front view which shows another embodiment of a barrel. バレルのさらに他の実施形態を示す正面図である。It is a front view which shows other embodiment of a barrel.

符号の説明Explanation of symbols

１０ 射出成形機
１１ 金型ユニット
１１S 固定側金型
１１M 可動側金型
１２ 型締め装置
１３ キャビティ
１４ 計量射出装置
１５ 可塑化送出装置
１６ ベース
１７ 型締め用モータ
１８ 可動側ダイプレート
１９ ボールねじ機構
１９A ボールねじ軸
１９N ボールナット
２０ 支柱
２１ エジェクタ装置
２２ ケーシング
２３ バレル
２３F バレルの一端面
２４ ロータ
２４F ロータの端面
２５ ロータ駆動手段
２６ 加熱手段（ヒータ）
２７ 樹脂流入通路
２８ 連れ回り抑制溝
２９ 逆止め弁
２９B 弁体
２９S スリーブ
２９C 切欠き部
３０ 可塑化混練通路
３１ チャンバ
３２ 螺旋溝
３２O 螺旋溝の外側端部
３２I 螺旋溝の内側端部
３３ 樹脂滞留阻止部
３４ 連れ回り抑制部
３５ ロータ駆動モータ
３６ ホッパ
３７ 固定側ダイプレート
３８ ノズル
３９ 射出プランジャ
４０ 射出・計量用モータ
４１ 樹脂通路
４２ 減速機 DESCRIPTION OF SYMBOLS 10 Injection molding machine 11 Mold unit 11 S Fixed side mold 11 M Movable side mold 12 Mold clamping device 13 Cavity 14 Metering injection device 15 Plasticizing delivery device 16 Base 17 Mold clamping motor 18 Movable side die plate 19 Ball screw Mechanism 19 A Ball screw shaft 19 N Ball nut 20 Strut 21 Ejector device 22 Casing 23 Barrel 23 End face of F barrel 24 Rotor 24 End face of F rotor 25 Rotor drive means 26 Heating means (heater)
27 Resin inflow passage 28 Follow-up suppression groove 29 Check valve 29 B valve body 29 S sleeve 29 C notch 30 Plasticization kneading passage 31 Chamber 32 Spiral groove 32 O Outer end of spiral groove 32 I Inner end of spiral groove Part 33 Resin stagnation prevention part 34 Follow-up restraint part 35 Rotor drive motor 36 Hopper 37 Die plate on fixed side 38 Nozzle 39 Injection plunger 40 Injection / metering motor 41 Resin passage 42 Reducer

Claims (9)

螺旋溝が画成され、かつ回転する第１の部材と、この第１の部材が摺接する摺接面を有する第２の部材と、成形材料を加熱するための加熱手段とを具え、前記第１の部材の螺旋溝内に供給される成形材料を前記加熱手段により加熱して可塑化させながら前記第１の部材を回転することにより、可塑化された成形材料を金型のキャビティ側へと送出するための可塑化送出装置であって、
前記第１の部材の回転に伴い、この第１の部材の螺旋溝内に介在する材料の連れ回りを抑制するための連れ回り抑制部が前記第２の部材の摺接面に形成されていることを特徴とする可塑化送出装置。 A first member having a spiral groove defined and rotating; a second member having a sliding contact surface with which the first member slides; and a heating means for heating the molding material. By rotating the first member while plasticizing the molding material supplied into the spiral groove of one member by the heating means, the plasticized molding material is moved to the cavity side of the mold. A plasticizing delivery device for delivery comprising:
Along with the rotation of the first member, a follow-up restraining portion for restraining the follow-up of the material interposed in the spiral groove of the first member is formed on the sliding contact surface of the second member. A plasticizing delivery device characterized by that. 前記連れ回り抑制部は、前記螺旋溝を横切るように延在する複数の溝を含むことを特徴とする請求項１に記載の可塑化送出装置。   The plasticizing delivery device according to claim 1, wherein the follow-up suppressing unit includes a plurality of grooves extending so as to cross the spiral groove. 個々の前記溝の幅が前記成形材料の寸法よりも小さく設定されていることを特徴とする請求項２に記載の可塑化送出装置。   3. The plasticizing delivery device according to claim 2, wherein the width of each of the grooves is set smaller than the dimension of the molding material. 個々の前記溝の深さは、前記螺旋溝の下流側ほど浅く設定されていることを特徴とする請求項２または請求項３に記載の可塑化送出装置。   4. The plasticizing delivery apparatus according to claim 2, wherein the depth of each of the grooves is set to be shallower toward the downstream side of the spiral groove. 5. 前記連れ回り抑制部は、前記成形材料の寸法よりも小さな表面粗さを持つ粗面を含むことを特徴とする請求項１に記載の可塑化送出装置。   The plasticizing delivery device according to claim 1, wherein the follow-up suppressing portion includes a rough surface having a surface roughness smaller than a dimension of the molding material. 前記連れ回り抑制部は、前記螺旋溝の上流側と対向する前記摺接面の部分にのみ形成されていることを特徴とする請求項１から請求項５の何れかに記載の可塑化送出装置。   The plasticizing and feeding device according to any one of claims 1 to 5, wherein the follow-up suppressing portion is formed only on a portion of the sliding contact surface facing the upstream side of the spiral groove. . 前記第１の部材は、前記螺旋溝がこの第１の部材の回転軸線の半径方向に延在するロータであり、前記第２の部材は、前記摺接面が円形となったバレルであることを特徴とする請求項１から請求項６の何れかに記載の可塑化送出装置。   The first member is a rotor in which the spiral groove extends in a radial direction of the rotation axis of the first member, and the second member is a barrel having a circular slidable contact surface. The plasticizing delivery device according to any one of claims 1 to 6, wherein 前記第１の部材は、前記螺旋溝がこの第１の部材の回転軸線の長手方向に延在するスクリューであり、前記第２の部材は、前記摺接面が円筒形となったシリンダであることを特徴とする請求項１から請求項６の何れかに記載の可塑化送出装置。   The first member is a screw in which the spiral groove extends in the longitudinal direction of the rotation axis of the first member, and the second member is a cylinder in which the sliding contact surface is cylindrical. The plasticizing delivery device according to any one of claims 1 to 6, wherein the plasticizing delivery device is provided. 所定量の成形材料を金型のキャビティ内に射出する計量射出部と、成形材料を可塑化して前記計量射出部に送出する可塑化送出部とを具えた射出成形機であって、前記可塑化送出部が請求項１から請求項８の何れかに記載の可塑化送出装置を含んでいることを特徴とする射出成形機。   An injection molding machine comprising: a metering injection unit that injects a predetermined amount of molding material into a cavity of a mold; and a plasticizing sending unit that plasticizes the molding material and sends the molding material to the metering injection unit. An injection molding machine, wherein the delivery section includes the plasticizing delivery device according to any one of claims 1 to 8.
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