JP2013244734A

JP2013244734A - Injection molding machine

Info

Publication number: JP2013244734A
Application number: JP2012122351A
Authority: JP
Inventors: Takaaki Morie; 孝明森江; Yukitaka Yamashita; 幸貴山下; Koji Moriya; 幸次守谷; Tonro Tamura; 惇朗田村
Original assignee: Sumitomo Heavy Industries Ltd
Current assignee: Sumitomo Heavy Industries Ltd
Priority date: 2012-05-29
Filing date: 2012-05-29
Publication date: 2013-12-09
Anticipated expiration: 2032-05-29
Also published as: CN103448219A; CN103448219B; JP5839482B2

Abstract

PROBLEM TO BE SOLVED: To provide an injection molding machine capable of performing efficient temperature control over a mold clamping force generating mechanism.SOLUTION: An injection molding machine 10 includes a first block 13 where an electromagnet 49 is formed and a second block 22 attracted by the electromagnet 49, and the first block 13 and second block 22 constitute a mold clamping force generating mechanism which generates mold clamping force. A flow passage pipe 91 in which a temperature control fluid flows is inserted into an insertion part 93 formed on at least one of the first block 13 and second block 22, and the flow passage pipe 91 is fixed to the insertion part 93 in a cooling fit or shrinkage fit manner.

Description

本発明は、射出成形機に関する。 The present invention relates to an injection molding machine.

射出成形機は、金型装置のキャビティ空間に溶融した樹脂を充填し、固化させることによって成形品を製造する。金型装置は固定金型及び可動金型で構成され、型締め時に固定金型と可動金型との間にキャビティ空間が形成される。金型装置の型閉じ、型締め、及び型開きは型締装置によって行われる。型締装置として、型開閉動作にはリニアモータを用い、型締動作には電磁石を用いたものが提案されている（例えば、特許文献１参照）。 An injection molding machine manufactures a molded product by filling molten resin into a cavity space of a mold apparatus and solidifying the resin. The mold apparatus includes a fixed mold and a movable mold, and a cavity space is formed between the fixed mold and the movable mold when the mold is clamped. Mold closing, mold clamping, and mold opening of the mold apparatus are performed by a mold clamping apparatus. As a mold clamping device, an apparatus using a linear motor for mold opening / closing operation and an electromagnet for mold clamping operation has been proposed (for example, see Patent Document 1).

電磁石のコイルに直流電流が供給されると、電磁石が形成される第１のブロックと、第１のブロックと間隔をおいて配設される第２のブロックとの間に吸着力が発生し、その吸着力によって型締力が発生する。第１のブロックと、第２のブロックとで型締力発生機構が構成される。 When a direct current is supplied to the coil of the electromagnet, an attracting force is generated between the first block in which the electromagnet is formed and the second block arranged at a distance from the first block, The clamping force is generated by the suction force. A mold clamping force generation mechanism is configured by the first block and the second block.

国際公開第２００５／０９００５２号International Publication No. 2005/090052

従来、型締力発生機構の効率的な温調が困難であった。 Conventionally, it has been difficult to efficiently control the temperature of the mold clamping force generation mechanism.

本発明は、上記課題に鑑みてなされたものであって、型締力発生機構を効率的に温調可能な射出成形機の提供を目的とする。 The present invention has been made in view of the above-described problems, and an object of the present invention is to provide an injection molding machine capable of efficiently adjusting the temperature of the mold clamping force generation mechanism.

上記課題を解決するため、本発明の一態様による射出成形機は、
電磁石が形成される第１のブロックと、前記電磁石で吸着される第２のブロックとを備え、前記第１のブロックと前記第２のブロックとで型締力を発生させる型締力発生機構が構成され、
前記第１のブロック及び前記第２のブロックの少なくとも一方に形成される挿入部に、温調流体を流す流路管が挿入され、前記流路管が冷やし嵌め又は焼き嵌めで前記挿入部に固定されることを特徴とする。 In order to solve the above problems, an injection molding machine according to an aspect of the present invention is provided.
A mold clamping force generation mechanism that includes a first block on which an electromagnet is formed and a second block that is attracted by the electromagnet, and generates a mold clamping force between the first block and the second block. Configured,
A channel pipe for flowing a temperature-controlled fluid is inserted into an insertion part formed in at least one of the first block and the second block, and the channel pipe is fixed to the insertion part by cold fitting or shrink fitting. It is characterized by being.

本発明によれば、型締力発生機構を効率的に温調可能な射出成形機が提供される。 According to the present invention, an injection molding machine capable of efficiently adjusting the temperature of the mold clamping force generation mechanism is provided.

本発明の第１実施形態による射出成形機の型閉じ完了時の状態を示す図である。It is a figure which shows the state at the time of mold closing completion of the injection molding machine by 1st Embodiment of this invention. 本発明の第１実施形態による射出成形機の型開き完了時の状態を示す図である。It is a figure which shows the state at the time of the mold opening completion of the injection molding machine by 1st Embodiment of this invention. 第１実施形態によるリヤプラテンを示す斜視図である。It is a perspective view which shows the rear platen by 1st Embodiment. 第１実施形態による複数種類の電磁鋼板の構成を示す図である。It is a figure which shows the structure of the multiple types of electromagnetic steel plate by 1st Embodiment. 第２実施形態によるリヤプラテンを示す断面図である。It is sectional drawing which shows the rear platen by 2nd Embodiment.

以下、本発明を実施するための形態について図面を参照して説明するが、各図面において、同一の又は対応する構成については同一の又は対応する符号を付して説明を省略する。各図面において、Ｘ方向は型開閉方向と平行な方向、Ｙ方向は電磁鋼板の積層方向と平行な方向、Ｚ方向はＸ方向及びＹ方向と互いに垂直な方向を表す。また、型閉じを行う際の可動プラテンの移動方向を前方とし、型開きを行う際の可動プラテンの移動方向を後方として説明する。 DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. In each of the drawings, the same or corresponding components are denoted by the same or corresponding reference numerals, and description thereof will be omitted. In each drawing, the X direction represents a direction parallel to the mold opening / closing direction, the Y direction represents a direction parallel to the laminating direction of the electromagnetic steel sheets, and the Z direction represents a direction perpendicular to the X direction and the Y direction. Further, a description will be given assuming that the moving direction of the movable platen when performing mold closing is the front and the moving direction of the movable platen when performing mold opening is the rear.

［第１実施形態］
図１は、本発明の第１実施形態による射出成形機の型閉じ完了時の状態を示す図である。図２は、本発明の第１実施形態による射出成形機の型開き完了時の状態を示す図である。 [First Embodiment]
FIG. 1 is a view showing a state at the completion of mold closing of the injection molding machine according to the first embodiment of the present invention. FIG. 2 is a view showing a state when the mold opening of the injection molding machine according to the first embodiment of the present invention is completed.

図において、１０は射出成形機、Ｆｒは射出成形機１０のフレーム、Ｇｄは該フレームＦｒ上に敷設される２本のレールよりなるガイド、１１は固定プラテン（第１の固定部材）である。固定プラテン１１は、型開閉方向（図において左右方向）に延びるガイドＧｄに沿って移動可能な位置調整ベースＢａ上に設けられてよい。尚、固定プラテン１１はフレームＦｒ上に載置されてもよい。 In the figure, 10 is an injection molding machine, Fr is a frame of the injection molding machine 10, Gd is a guide composed of two rails laid on the frame Fr, and 11 is a fixed platen (first fixing member). The fixed platen 11 may be provided on a position adjustment base Ba that is movable along a guide Gd that extends in the mold opening / closing direction (left-right direction in the drawing). The fixed platen 11 may be placed on the frame Fr.

固定プラテン１１と対向して可動プラテン（第１の可動部材）１２が配設される。可動プラテン１２は可動ベースＢｂ上に固定され、可動ベースＢｂはガイドＧｄ上を走行可能である。これにより、可動プラテン１２は、固定プラテン１１に対して型開閉方向に移動可能である。 A movable platen (first movable member) 12 is disposed facing the fixed platen 11. The movable platen 12 is fixed on the movable base Bb, and the movable base Bb can run on the guide Gd. Thereby, the movable platen 12 is movable in the mold opening / closing direction with respect to the fixed platen 11.

固定プラテン１１と所定の間隔を置いて、かつ、固定プラテン１１と平行にリヤプラテン（第２の固定部材）１３が配設される。リヤプラテン１３は、脚部１３ａを介してフレームＦｒに固定される。 A rear platen (second fixing member) 13 is disposed at a predetermined distance from the fixed platen 11 and parallel to the fixed platen 11. The rear platen 13 is fixed to the frame Fr via the leg portion 13a.

固定プラテン１１とリヤプラテン１３との間に４本の連結部材としてのタイバー１４（図においては、４本のタイバー１４のうちの２本だけを示す。）が架設される。タイバー１４を介して固定プラテン１１がリヤプラテン１３に固定される。タイバー１４に沿って可動プラテン１２が進退自在に配設される。可動プラテン１２におけるタイバー１４と対応する箇所にタイバー１４を貫通させるための図示されないガイド穴が形成される。尚、ガイド穴の代わりに、切欠部を形成するようにしてもよい。 Between the fixed platen 11 and the rear platen 13, four tie bars 14 (only two of the four tie bars 14 are shown in the figure) are installed as connecting members. The fixed platen 11 is fixed to the rear platen 13 via the tie bar 14. A movable platen 12 is disposed along the tie bar 14 so as to freely advance and retract. A guide hole (not shown) for penetrating the tie bar 14 is formed at a position corresponding to the tie bar 14 in the movable platen 12. In addition, you may make it form a notch part instead of a guide hole.

タイバー１４の前端部（図において右端部）には図示されないネジ部が形成され、該ネジ部にナットｎ１を螺合して締め付けることによって、タイバー１４の前端部が固定プラテン１１に固定される。タイバー１４の後端部はリヤプラテン１３に固定される。 A screw portion (not shown) is formed at the front end portion (right end portion in the drawing) of the tie bar 14, and the front end portion of the tie bar 14 is fixed to the fixed platen 11 by screwing and tightening a nut n1 to the screw portion. The rear end of the tie bar 14 is fixed to the rear platen 13.

固定プラテン１１には固定金型１５が、可動プラテン１２には可動金型１６がそれぞれ取り付けられ、可動プラテン１２の進退に伴って固定金型１５と可動金型１６とが接離させられ、型閉じ、型締め及び型開きが行われる。尚、型締めが行われるのに伴って、固定金型１５と可動金型１６との間に図示されないキャビティ空間が形成され、キャビティ空間に溶融した樹脂が充填される。固定金型１５及び可動金型１６によって金型装置１９が構成される。 A fixed mold 15 is attached to the fixed platen 11, and a movable mold 16 is attached to the movable platen 12. The fixed mold 15 and the movable mold 16 are brought into contact with and separated from each other as the movable platen 12 advances and retreats. Closing, mold clamping and mold opening are performed. As the mold clamping is performed, a cavity space (not shown) is formed between the fixed mold 15 and the movable mold 16, and the cavity space is filled with molten resin. A mold apparatus 19 is configured by the fixed mold 15 and the movable mold 16.

吸着板（第２の可動部材）２２は、可動プラテン１２と平行に配設される。吸着板２２は取付板２７を介してスライドベースＳｂに固定され、スライドベースＳｂはガイドＧｄ上を走行可能である。これにより、吸着板２２は、リヤプラテン１３よりも後方において進退自在となる。吸着板２２は、軟磁性材で形成されてよい。尚、取付板２７はなくてもよく、この場合、吸着板２２はスライドベースＳｂに直に固定される。 The suction plate (second movable member) 22 is disposed in parallel with the movable platen 12. The suction plate 22 is fixed to the slide base Sb via the mounting plate 27, and the slide base Sb can travel on the guide Gd. As a result, the suction plate 22 can move back and forth behind the rear platen 13. The adsorption plate 22 may be formed of a soft magnetic material. The attachment plate 27 may not be provided, and in this case, the suction plate 22 is directly fixed to the slide base Sb.

ロッド３９は、後端部において吸着板２２と連結させて、前端部において可動プラテン１２と連結させて配設される。したがって、ロッド３９は、型閉じ時に吸着板２２が前進するのに伴って前進させられて可動プラテン１２を前進させ、型開き時に吸着板２２が後退するのに伴って後退させられて可動プラテン１２を後退させる。そのために、リヤプラテン１３の中央部分にロッド３９を貫通させるための貫通孔４１が形成される。 The rod 39 is connected to the suction plate 22 at the rear end portion and is connected to the movable platen 12 at the front end portion. Therefore, the rod 39 is moved forward as the suction plate 22 moves forward when the mold is closed to move the movable platen 12 forward, and is retracted and moved backward as the suction plate 22 moves back when the mold is opened. Retreat. For this purpose, a through hole 41 for allowing the rod 39 to penetrate is formed in the central portion of the rear platen 13.

リニアモータ２８は、可動プラテン１２を進退させるための型開閉駆動部であって、例えば可動プラテン１２に連結された吸着板２２とフレームＦｒとの間に配設される。尚、リニアモータ２８は可動プラテン１２とフレームＦｒとの間に配設されてもよい。 The linear motor 28 is a mold opening / closing drive unit for moving the movable platen 12 forward and backward, and is disposed, for example, between the suction plate 22 connected to the movable platen 12 and the frame Fr. The linear motor 28 may be disposed between the movable platen 12 and the frame Fr.

リニアモータ２８は、固定子２９、及び可動子３１を備える。固定子２９は、フレームＦｒ上において、ガイドＧｄと平行に、かつ、スライドベースＳｂの移動範囲に対応させて形成される。可動子３１は、スライドベースＳｂの下端において、固定子２９と対向させて、かつ、所定の範囲にわたって形成される。 The linear motor 28 includes a stator 29 and a mover 31. The stator 29 is formed on the frame Fr in parallel with the guide Gd and corresponding to the movement range of the slide base Sb. The mover 31 is formed at a lower end of the slide base Sb so as to face the stator 29 and over a predetermined range.

可動子３１は、コア３４及びコイル３５を備える。コア３４は、固定子２９に向けて突出する複数の磁極歯３３を備える。複数の磁極歯３３は、型開閉方向と平行な方向に所定のピッチで配列される。コイル３５は、各磁極歯３３に巻装される。 The mover 31 includes a core 34 and a coil 35. The core 34 includes a plurality of magnetic pole teeth 33 that protrude toward the stator 29. The plurality of magnetic pole teeth 33 are arranged at a predetermined pitch in a direction parallel to the mold opening / closing direction. The coil 35 is wound around each magnetic pole tooth 33.

固定子２９は、図示されないコア、及び該コア上に設けられる図示されない複数の永久磁石を備える。複数の永久磁石は、型開閉方向と平行な方向に所定のピッチで配列され、可動子３１側の磁極がＮ極とＳ極とに交互に着磁されている。 The stator 29 includes a core (not shown) and a plurality of permanent magnets (not shown) provided on the core. The plurality of permanent magnets are arranged at a predetermined pitch in a direction parallel to the mold opening / closing direction, and the magnetic poles on the side of the mover 31 are alternately magnetized into N and S poles.

可動子３１のコイル３５に所定の電流が供給されると、コイル３５を流れる電流によって形成される磁場と、永久磁石によって形成される磁場との相互作用で、可動子３１が進退させられる。それに伴って、吸着板２２及び可動プラテン１２が進退させられ、型閉じ及び型開きが行われる。リニアモータ２８は、可動子３１の位置が目標値になるように、可動子３１の位置を検出する位置センサ５３の検出結果に基づいてフィードバック制御される。 When a predetermined current is supplied to the coil 35 of the mover 31, the mover 31 is advanced and retracted by the interaction between the magnetic field formed by the current flowing through the coil 35 and the magnetic field formed by the permanent magnet. Accordingly, the suction plate 22 and the movable platen 12 are moved back and forth, and the mold closing and mold opening are performed. The linear motor 28 is feedback-controlled based on the detection result of the position sensor 53 that detects the position of the mover 31 so that the position of the mover 31 becomes a target value.

尚、本実施の形態では、固定子２９に永久磁石を、可動子３１にコイル３５を配設するようになっているが、固定子にコイルを、可動子に永久磁石を配設することもできる。その場合、リニアモータ２８が駆動されるのに伴って、コイルが移動しないので、コイルに電力を供給するための配線を容易に行うことができる。 In the present embodiment, the permanent magnet is disposed on the stator 29 and the coil 35 is disposed on the mover 31, but the coil may be disposed on the stator and the permanent magnet may be disposed on the mover. it can. In this case, since the coil does not move as the linear motor 28 is driven, wiring for supplying power to the coil can be easily performed.

尚、型開閉駆動部として、リニアモータ２８の代わりに、回転モータ及び回転モータの回転運動を直線運動に変換するボールネジ機構、又は油圧シリンダ若しくは空気圧シリンダなどの流体圧シリンダなどが用いられてもよい。 As the mold opening / closing drive unit, instead of the linear motor 28, a rotary motor, a ball screw mechanism that converts the rotary motion of the rotary motor into a linear motion, or a fluid pressure cylinder such as a hydraulic cylinder or a pneumatic cylinder may be used. .

電磁石ユニット３７は、リヤプラテン１３と吸着板２２との間に吸着力を生じさせる。この吸着力は、ロッド３９を介して可動プラテン１２に伝達し、可動プラテン１２と固定プラテン１１との間に型締力が生じる。 The electromagnet unit 37 generates an attracting force between the rear platen 13 and the attracting plate 22. This suction force is transmitted to the movable platen 12 via the rod 39, and a mold clamping force is generated between the movable platen 12 and the fixed platen 11.

電磁石ユニット３７は、リヤプラテン１３側に形成された電磁石４９、及び吸着板２２側に形成された吸着部５１からなる。吸着部５１は、吸着板２２の吸着面（前端面）の所定の部分、例えば、吸着板２２においてロッド３９を包囲し、かつ、電磁石４９と対向する部分に形成される。また、リヤプラテン１３の吸着面（後端面）の所定の部分、例えば、ロッド３９のまわりには、電磁石４９のコイル４８を収容するコイル溝４５が形成される。コイル溝４５より内側にコア４６が形成される。コア４６の周りにコイル４８が巻装される。コイル４８の軸方向はＸ方向となっている。リヤプラテン１３のコア４６以外の部分にヨーク４７が形成される。 The electromagnet unit 37 includes an electromagnet 49 formed on the rear platen 13 side and a suction portion 51 formed on the suction plate 22 side. The suction portion 51 is formed in a predetermined portion of the suction surface (front end surface) of the suction plate 22, for example, a portion surrounding the rod 39 in the suction plate 22 and facing the electromagnet 49. A coil groove 45 for accommodating the coil 48 of the electromagnet 49 is formed around a predetermined portion of the attracting surface (rear end surface) of the rear platen 13, for example, around the rod 39. A core 46 is formed inside the coil groove 45. A coil 48 is wound around the core 46. The axial direction of the coil 48 is the X direction. A yoke 47 is formed at a portion other than the core 46 of the rear platen 13.

尚、本実施形態においては、リヤプラテン１３とは別に電磁石４９が、吸着板２２とは別に吸着部５１が形成されるが、リヤプラテン１３の一部として電磁石を、吸着板２２の一部として吸着部を形成してもよい。また、電磁石と吸着部の配置は逆であってもよい。例えば、吸着板２２側に電磁石４９を設け、リヤプラテン１３側に吸着部５１を設けてもよい。また、電磁石４９のコイル４８の数は、複数であってもよい。 In the present embodiment, the electromagnet 49 is formed separately from the rear platen 13 and the attracting part 51 is formed separately from the attracting plate 22, but the electromagnet is part of the rear platen 13 and the attracting part is part of the attracting plate 22. May be formed. Moreover, the arrangement of the electromagnet and the attracting part may be reversed. For example, the electromagnet 49 may be provided on the suction plate 22 side, and the suction portion 51 may be provided on the rear platen 13 side. Moreover, the number of the coils 48 of the electromagnet 49 may be plural.

電磁石ユニット３７において、コイル４８に電流を供給すると、電磁石４９が駆動され、吸着部５１を吸着し、型締力を発生させることができる。電磁石４９が形成されるリヤプラテン（第１のブロック）１３と、吸着部５１が形成される吸着板（第２のブロック）２２とで型締力発生機構が構成される。 When an electric current is supplied to the coil 48 in the electromagnet unit 37, the electromagnet 49 is driven to attract the attracting part 51 and generate a mold clamping force. The rear platen (first block) 13 on which the electromagnet 49 is formed and the suction plate (second block) 22 on which the suction part 51 is formed constitute a mold clamping force generation mechanism.

制御部６０は、例えばＣＰＵ及びメモリ等を備え、メモリに記録された制御プログラムをＣＰＵによって処理することにより、リニアモータ２８の動作及び電磁石４９の動作を制御する。制御部６０は、型締力を検出する型締力センサ５５と接続されており、型締力センサ５５の検出結果に基づいて、所定の型締力が生じるように、電磁石４９のコイル４８への供給電流値を設定してよい。型締力センサ５５は、例えば型締力に応じて伸びるタイバー１４の歪み（伸び量）を検出する歪みセンサであってよい。尚、型締力センサ５５としては、例えばロッド３９にかかる荷重を検出するロードセル等の荷重センサ、電磁石４９の磁場を検出する磁気センサが使用可能であり、型締力センサ５５の種類は多種多様であってよい。 The control unit 60 includes, for example, a CPU and a memory, and controls the operation of the linear motor 28 and the operation of the electromagnet 49 by processing a control program recorded in the memory by the CPU. The control unit 60 is connected to a mold clamping force sensor 55 that detects a mold clamping force. Based on the detection result of the mold clamping force sensor 55, the controller 60 applies the coil 48 of the electromagnet 49 to a predetermined mold clamping force. May be set. The mold clamping force sensor 55 may be, for example, a strain sensor that detects distortion (elongation amount) of the tie bar 14 that expands according to the mold clamping force. As the mold clamping force sensor 55, for example, a load sensor such as a load cell that detects a load applied to the rod 39 or a magnetic sensor that detects the magnetic field of the electromagnet 49 can be used. It may be.

次に、上記構成の射出成形機１０の動作について説明する。射出成形機１０の各種動作は、制御部６０による制御下で行われる。 Next, the operation of the injection molding machine 10 configured as described above will be described. Various operations of the injection molding machine 10 are performed under the control of the control unit 60.

制御部６０は、型閉じ工程を制御する。図２の状態（型開き状態）において、制御部６０は、リニアモータ２８を駆動して、可動プラテン１２を前進させる。図１に示すように、可動金型１６が固定金型１５に当接し、型閉じ工程が完了する。このとき、リヤプラテン１３と吸着板２２との間、即ち電磁石４９と吸着部５１との間には、ギャップδが形成される。尚、型閉じに必要とされる力は、型締力と比較されて十分に小さくされる。 The controller 60 controls the mold closing process. In the state of FIG. 2 (die opening state), the control unit 60 drives the linear motor 28 to advance the movable platen 12. As shown in FIG. 1, the movable mold 16 comes into contact with the fixed mold 15, and the mold closing process is completed. At this time, a gap δ is formed between the rear platen 13 and the suction plate 22, that is, between the electromagnet 49 and the suction portion 51. Note that the force required for mold closing is sufficiently reduced compared to the mold clamping force.

続いて、制御部６０は、型締め工程を制御する。制御部６０は、図１の状態（型閉じ状態）で、電磁石４９のコイル４８に直流電流を供給する。そうすると、コイル４８を流れる直流電流によってコイル４８内に磁場が生じ、コア４６が着磁され、磁場が強化される。そして、所定のギャップをおいて対向する電磁石４９と吸着部５１との間に吸着力が生じ、この吸着力がロッド３９を介して可動プラテン１２に伝達し、可動プラテン１２と固定プラテン１１との間に型締力が生じる。型締め状態の金型装置１９のキャビティ空間に溶融した樹脂が充填され、冷却、固化され成形品となる。 Subsequently, the control unit 60 controls the mold clamping process. The controller 60 supplies a direct current to the coil 48 of the electromagnet 49 in the state of FIG. If it does so, a magnetic field will arise in the coil 48 with the direct current which flows through the coil 48, the core 46 will be magnetized, and a magnetic field will be strengthened. Then, an attracting force is generated between the electromagnet 49 and the attracting part 51 facing each other with a predetermined gap, and this attracting force is transmitted to the movable platen 12 via the rod 39, and the movable platen 12 and the fixed platen 11 are Clamping force is generated between them. The cavity space of the mold apparatus 19 in the mold-clamped state is filled with molten resin, cooled and solidified to form a molded product.

続いて、制御部６０は、電磁石４９のコア４６を消磁する。コア４６の消磁は、着磁時とは逆向きの直流電流をコイル４８に供給することで行われる。消磁工程において、直流電流の向きが複数回反転されてもよい。コア４６の消磁によって、型開き開始までの待ち時間が短くなる。 Subsequently, the control unit 60 demagnetizes the core 46 of the electromagnet 49. The demagnetization of the core 46 is performed by supplying a direct current in the direction opposite to that at the time of magnetization to the coil 48. In the demagnetization step, the direction of the direct current may be reversed a plurality of times. Due to the demagnetization of the core 46, the waiting time until the mold opening starts is shortened.

次いで、制御部６０は、型開き工程を制御する。制御部６０は、リニアモータ２８のコイル３５に電流を供給して、可動プラテン１２を後退させる。可動金型１６が後退して型開きが行われる。型開き後、図示されないエジェクタ装置が可動金型１６から成形品を突き出す。このようにして、成形品が得られる。 Next, the control unit 60 controls the mold opening process. The control unit 60 supplies current to the coil 35 of the linear motor 28 to move the movable platen 12 backward. The movable mold 16 is retracted and the mold is opened. After the mold opening, an ejector device (not shown) ejects the molded product from the movable mold 16. In this way, a molded product is obtained.

ところで、金型装置１９が交換されると、金型装置１９の厚さが変わり、型閉じ完了時にリヤプラテン１３と吸着板２２との間に形成されるギャップδが変わる。ギャップδが変わると、吸着力が変わり、型締力が変わる。 By the way, when the mold apparatus 19 is replaced, the thickness of the mold apparatus 19 changes, and the gap δ formed between the rear platen 13 and the suction plate 22 changes when the mold closing is completed. When the gap δ changes, the suction force changes and the mold clamping force changes.

そこで、射出成形機１０は、金型装置１９の厚さに応じて可動プラテン１２と吸着板２２との間隔を調整する型厚調整部５６を備える。型厚調整部５６は、型厚調整用モータ５７、ギヤ５８、ナット５９などによって構成される。ナット５９は、吸着板２２に対して回転自在に、且つ進退不能に支持されている。吸着板２２の中央部分を貫通するロッド３９の後端部に形成されるねじ軸部４３と、ナット５９とが螺合されている。ナット５９及びねじ軸部４３によって運動方向変換部が構成され、該運動方向変換部において、ナット５９の回転運動がロッド３９の直進運動に変換される。ナット５９の外周面に図示されないギヤが形成され、このギヤと、型厚調整用モータ５７の出力軸５７ａに取り付けられたギヤ５８が噛合させられる。型厚調整用モータ５７は、例えばサーボモータであって、出力時軸５７ａの回転数を検出するエンコーダ部５７ｂを含む。 Therefore, the injection molding machine 10 includes a mold thickness adjusting unit 56 that adjusts the distance between the movable platen 12 and the suction plate 22 in accordance with the thickness of the mold apparatus 19. The mold thickness adjusting unit 56 includes a mold thickness adjusting motor 57, a gear 58, a nut 59, and the like. The nut 59 is supported so as to be rotatable with respect to the suction plate 22 and so as not to advance and retract. A screw shaft portion 43 formed at the rear end portion of the rod 39 that penetrates the central portion of the suction plate 22 and a nut 59 are screwed together. The nut 59 and the screw shaft portion 43 constitute a motion direction converting portion, and the rotational motion of the nut 59 is converted into a straight motion of the rod 39 in the motion direction converting portion. A gear (not shown) is formed on the outer peripheral surface of the nut 59, and this gear is engaged with the gear 58 attached to the output shaft 57a of the mold thickness adjusting motor 57. The mold thickness adjusting motor 57 is, for example, a servo motor, and includes an encoder portion 57b that detects the rotational speed of the output shaft 57a.

型厚調整モータ５７が回転すると、ナット５９が回転し、ロッド３９が吸着板２２に対して進退し、吸着板２２と可動プラテン１２との間の間隔が調整される。よって、型閉じ完了時におけるギャップδを最適な値にすることができる。型厚調整モータ５７は、ギャップδが所望の値となるように、エンコーダ部５７ｂの検出結果に基づいてフィードバック制御される。 When the mold thickness adjusting motor 57 rotates, the nut 59 rotates, the rod 39 advances and retreats with respect to the suction plate 22, and the distance between the suction plate 22 and the movable platen 12 is adjusted. Therefore, the gap δ at the completion of mold closing can be set to an optimum value. The mold thickness adjusting motor 57 is feedback-controlled based on the detection result of the encoder unit 57b so that the gap δ becomes a desired value.

次に、図１〜図４に基づいてリヤプラテン１３の構成について説明する。図３は、第１実施形態によるリヤプラテンを示す斜視図である。図４は、第１実施形態による複数種類の電磁鋼板の構成を示す図である。 Next, the configuration of the rear platen 13 will be described with reference to FIGS. FIG. 3 is a perspective view showing the rear platen according to the first embodiment. FIG. 4 is a diagram showing a configuration of a plurality of types of electrical steel sheets according to the first embodiment.

リヤプラテン１３は、型締め開始時等、電磁石４９の磁場の変化時に生じる渦電流を低減するため、複数の電磁鋼板を積層してなる積層鋼板を有する。電磁鋼板は例えばケイ素を添加した鋼板であってよい。電磁鋼板の表面には絶縁被膜が形成されている。 The rear platen 13 has a laminated steel plate formed by laminating a plurality of electromagnetic steel plates in order to reduce eddy currents generated when the magnetic field of the electromagnet 49 changes, such as when clamping is started. The electromagnetic steel sheet may be a steel sheet to which silicon is added, for example. An insulating coating is formed on the surface of the electromagnetic steel sheet.

例えば、リヤプラテン１３は、図３に示すように、Ｙ方向に間隔をおいて配設される２つの外側積層鋼板７１、７２と、Ｚ方向に間隔をおいて配設される２つの内側積層鋼板７３、７４とを有する。２つの外側積層鋼板７１、７２と、２つの内側積層鋼板７３、７４とで、リヤプラテン１３のロッド３９を貫通させる貫通孔４１が画成される。 For example, as shown in FIG. 3, the rear platen 13 includes two outer laminated steel plates 71 and 72 that are spaced apart in the Y direction, and two inner laminated steel plates that are spaced apart in the Z direction. 73, 74. The two outer laminated steel plates 71 and 72 and the two inner laminated steel plates 73 and 74 define a through hole 41 through which the rod 39 of the rear platen 13 passes.

外側積層鋼板７１、７２は、複数の電磁鋼板８１、８２をＹ方向に積層してなる。隣り合う電磁鋼板は、溶接で固定されていてもよいし、治具で締め付け固定されていてもよい。電磁鋼板８１、８２には、図４（ａ）及び（ｂ）に示すようにコイル溝４５を構成する凹部８１ａ、８２ａが形成されている。また、電磁鋼板８１、８２には、流路管９１（図１及び図２参照）を挿入する挿入孔８１ｂ、８２ｂが形成されている。挿入孔８１ｂ、８２ｂは、電磁石４９が形成する磁場に悪影響を与えないように、リヤプラテン１３の吸着面（後端面）からできるだけ離れた位置に配置される。 The outer laminated steel plates 71 and 72 are formed by laminating a plurality of electromagnetic steel plates 81 and 82 in the Y direction. Adjacent electromagnetic steel sheets may be fixed by welding or may be clamped and fixed by a jig. As shown in FIGS. 4A and 4B, the electromagnetic steel plates 81 and 82 are formed with recesses 81 a and 82 a that constitute the coil groove 45. The electromagnetic steel plates 81 and 82 are formed with insertion holes 81b and 82b for inserting the flow path pipe 91 (see FIGS. 1 and 2). The insertion holes 81b and 82b are arranged as far as possible from the attracting surface (rear end surface) of the rear platen 13 so as not to adversely affect the magnetic field formed by the electromagnet 49.

内側積層鋼板７３、７４は、２つの外側積層鋼板７１、７２の間に配設される。内側積層鋼板７３、７４は、それぞれ、複数の電磁鋼板８３をＹ方向に積層してなる。電磁鋼板８３には、図４（ｃ）に示すように、コイル溝４５を構成する凹部８３ａが形成されている。また、電磁鋼板８３には、流路管９１（図１及び図２参照）を挿入する挿入孔８３ｂが形成されている。挿入孔８３ｂは、電磁石４９が形成する磁場に悪影響を与えないように、リヤプラテン１３の吸着面（後端面）からできるだけ離れた位置に配置される。 The inner laminated steel plates 73 and 74 are disposed between the two outer laminated steel plates 71 and 72. The inner laminated steel plates 73 and 74 are each formed by laminating a plurality of electromagnetic steel plates 83 in the Y direction. As shown in FIG. 4C, the electromagnetic steel plate 83 is formed with a recess 83 a that constitutes the coil groove 45. In addition, the electromagnetic steel plate 83 is formed with an insertion hole 83b for inserting the flow path pipe 91 (see FIGS. 1 and 2). The insertion hole 83b is disposed at a position as far as possible from the adsorption surface (rear end surface) of the rear platen 13 so as not to adversely affect the magnetic field formed by the electromagnet 49.

流路管９１は、リヤプラテン１３をＹ方向に貫通してよい。流路管９１は、２つの外側積層鋼板７１、７２、及び２つの内側積層鋼板７３、７４のいずれか一方を積層方向（Ｙ方向）に貫通する。２つの内側積層鋼板７３、７４の両方を温調するため、少なくとも２つの流路管９１が設けられてよい。尚、流路管９１の数は、積層鋼板の数や形状、配置に応じて適宜選定されてよい。 The channel tube 91 may penetrate the rear platen 13 in the Y direction. The channel tube 91 penetrates either one of the two outer laminated steel plates 71 and 72 and the two inner laminated steel plates 73 and 74 in the laminating direction (Y direction). In order to control the temperature of both the two inner laminated steel plates 73 and 74, at least two flow channel pipes 91 may be provided. The number of flow channel pipes 91 may be appropriately selected according to the number, shape, and arrangement of laminated steel plates.

流路管９１は、例えば円筒管であって、温調流体の流路を内部に有する。温調流体が流路管９１の内部を流れるので、積層鋼板を積層方向に貫通する貫通孔が流路となる場合と異なり、電磁鋼板同士の間から温調流体が漏出することがない。また、温調流体がリヤプラテン１３と直接接触しないので、リヤプラテン１３の腐食が防止される。 The flow path pipe 91 is, for example, a cylindrical pipe, and has a temperature control fluid flow path therein. Since the temperature control fluid flows through the flow path pipe 91, the temperature control fluid does not leak from between the magnetic steel sheets, unlike the case where the through hole penetrating the laminated steel sheet in the stacking direction becomes the flow path. Further, since the temperature control fluid does not directly contact the rear platen 13, corrosion of the rear platen 13 is prevented.

温調流体は、リヤプラテン１３と熱交換し、リヤプラテン１３を温調する。温調流体は、冷却水や空気などの冷媒であってよい。冷媒は、リヤプラテン１３を冷却することで、電磁石４９のコイル４８の過熱を抑制する。冷却効率を高めるため、流路管９１は、図１等に示すように、吸着板２２から見てコイル溝４５の裏側に配設されてよい。尚、温調流体は、温水などの熱媒であってもよい。 The temperature control fluid exchanges heat with the rear platen 13 to control the temperature of the rear platen 13. The temperature control fluid may be a coolant such as cooling water or air. The refrigerant cools the rear platen 13 to suppress overheating of the coil 48 of the electromagnet 49. In order to increase the cooling efficiency, the flow path pipe 91 may be disposed on the back side of the coil groove 45 as viewed from the adsorption plate 22 as shown in FIG. The temperature control fluid may be a heat medium such as warm water.

流路管９１は、リヤプラテン１３の挿入孔９３に挿入され、例えば冷やし嵌め、又は焼き嵌めで挿入孔９３に固定されてよい。リヤプラテン１３の挿入孔９３は、電磁鋼板８１〜８３の挿入孔８１ｂ〜８３ｂで構成される。 The flow path pipe 91 may be inserted into the insertion hole 93 of the rear platen 13 and may be fixed to the insertion hole 93 by, for example, cold fitting or shrink fitting. The insertion hole 93 of the rear platen 13 is composed of insertion holes 81b to 83b of the electromagnetic steel plates 81 to 83.

冷やし嵌めでは、ドライアイスや液体窒素等の冷媒で流路管９１を冷却し、流路管９１の外径を小さくしたうえで、流路管９１よりも高温（例えば室温）のリヤプラテン１３の挿入孔９３に流路管９１を挿入する。その後、流路管９１の温度が室温に戻ると、流路管９１が膨らみ、流路管９１の外壁が挿入孔９３の内壁で締め付けられる。 In the cold fitting, the flow path pipe 91 is cooled with a refrigerant such as dry ice or liquid nitrogen, the outer diameter of the flow path pipe 91 is reduced, and the rear platen 13 having a higher temperature (for example, room temperature) than the flow path pipe 91 is inserted. The channel pipe 91 is inserted into the hole 93. Thereafter, when the temperature of the channel tube 91 returns to room temperature, the channel tube 91 swells and the outer wall of the channel tube 91 is fastened by the inner wall of the insertion hole 93.

焼き嵌めでは、リヤプラテン１３を加熱し、リヤプラテン１３の挿入孔９３の直径を大きくしたうえで、リヤプラテン１３よりも低温（例えば室温）の流路管９１を挿入孔９３に挿入する。その後、リヤプラテン１３の温度が室温に戻ると、挿入孔９３の直径が縮み、挿入孔９３の内壁で流路管９１の外壁が締め付けられる。 In shrink fitting, the rear platen 13 is heated to increase the diameter of the insertion hole 93 of the rear platen 13, and the flow path pipe 91 having a temperature lower than that of the rear platen 13 (for example, room temperature) is inserted into the insertion hole 93. Thereafter, when the temperature of the rear platen 13 returns to room temperature, the diameter of the insertion hole 93 is reduced, and the outer wall of the flow channel tube 91 is tightened by the inner wall of the insertion hole 93.

冷やし嵌め又は焼き嵌めによって挿入孔９３の内壁と流路管９１の外壁との間の隙間が少なくなり、接触熱抵抗が下がるので、リヤプラテン１３の温調効率が良くなる。流路管９１の外壁が冷やし嵌め又は焼き嵌めによって均一に締め付けられるように、流路管９１は円筒管で構成され、挿入孔９３は円状の断面形状を有してよい。 The gap between the inner wall of the insertion hole 93 and the outer wall of the flow channel pipe 91 is reduced by the cold fitting or shrink fitting, and the contact thermal resistance is lowered, so that the temperature regulation efficiency of the rear platen 13 is improved. The channel tube 91 may be a cylindrical tube, and the insertion hole 93 may have a circular cross-sectional shape so that the outer wall of the channel tube 91 is uniformly tightened by cold fitting or shrink fitting.

リヤプラテン１３の挿入孔９３の内壁と、流路管９１の外壁との間には、熱伝達部材としての金属シート９５が介在してよい。金属シート９５の硬さは、流路管９１の硬さよりも低い（柔らかい）ことが好ましい。金属シート９５の硬さは、冷やし嵌め又は焼き嵌めの前に押し込み硬さ試験法で測定される。押し込み硬さ試験法としては、例えばブリネル硬さ試験法（ＪＩＳＺ２２４３）が用いられる。例えば、流路管９１を形成する金属がステンレス鋼の場合、金属シート９５の金属としては、銅（Ｃｕ）、アルミニウム（Ａｌ）、錫（Ｓｎ）、鉛（Ｐｂ）、銀（Ａｇ）、インジウム（Ｉｎ）、又はこれらのいずれか１種以上を含む合金が用いられる。柔らかさ及びコストの観点から、インジウム又はインジウム合金が特に好適に用いられる。 A metal sheet 95 as a heat transfer member may be interposed between the inner wall of the insertion hole 93 of the rear platen 13 and the outer wall of the flow channel pipe 91. The hardness of the metal sheet 95 is preferably lower (softer) than the hardness of the channel tube 91. The hardness of the metal sheet 95 is measured by an indentation hardness test method before cold fitting or shrink fitting. As the indentation hardness test method, for example, the Brinell hardness test method (JIS Z2243) is used. For example, when the metal forming the flow path pipe 91 is stainless steel, the metal of the metal sheet 95 is copper (Cu), aluminum (Al), tin (Sn), lead (Pb), silver (Ag), indium. (In) or an alloy containing any one or more of these is used. Indium or an indium alloy is particularly preferably used from the viewpoint of softness and cost.

冷やし嵌めでは、金属シート９５を流路管９１の外壁に巻き付け、金属シート９５及び流路管９１をリヤプラテン１３の挿入孔９３に挿入する。冷やし嵌めでは、挿入孔９３への挿入前に、流路管９１及び金属シート９５の少なくともいずれか一方を冷媒で冷却する。 In the cold fitting, the metal sheet 95 is wound around the outer wall of the flow channel tube 91, and the metal sheet 95 and the flow channel tube 91 are inserted into the insertion hole 93 of the rear platen 13. In the cold fitting, before insertion into the insertion hole 93, at least one of the flow path tube 91 and the metal sheet 95 is cooled with a refrigerant.

例えば、挿入孔９３への挿入前に流路管９１のみを冷媒で冷却する場合、挿入孔９３への挿入後に流路管９１の温度が室温に戻り、流路管９１が膨らみ、挿入孔９３の内壁と流路管９１の外壁とで金属シート９５が挟まれ、薄く変形する。金属シート９５の変形は、弾性変形でも塑性変形でもよい。金属シート９５は、流路管９１よりも柔らかい金属で形成されるので、挿入孔９３の内壁と流路管９１の外壁との間の隙間のばらつきを吸収するように変形して隙間を埋め、挿入孔９３の内壁と流路管９１の外壁との両方に密着する。 For example, when only the flow path pipe 91 is cooled with the refrigerant before insertion into the insertion hole 93, the temperature of the flow path pipe 91 returns to room temperature after insertion into the insertion hole 93, the flow path pipe 91 expands, and the insertion hole 93. The metal sheet 95 is sandwiched between the inner wall and the outer wall of the flow channel tube 91, and deforms thinly. The deformation of the metal sheet 95 may be elastic deformation or plastic deformation. Since the metal sheet 95 is formed of a softer metal than the flow path pipe 91, the metal sheet 95 is deformed so as to absorb the variation in the gap between the inner wall of the insertion hole 93 and the outer wall of the flow path pipe 91, and the gap is filled. It closely contacts both the inner wall of the insertion hole 93 and the outer wall of the channel tube 91.

また、挿入孔９３への挿入前に金属シート９５のみを冷媒で冷却し、金属シート９５の厚さを薄くする場合、挿入孔９３への挿入後に金属シート９５の温度が室温に戻り、金属シート９５の厚さが厚くなり、挿入孔９３の内壁と流路管９１の外壁とで金属シート９５が挟まれる。金属シート９５は、挿入孔９３の内壁と流路管９１の外壁との間の隙間のばらつきを吸収するように変形して隙間を埋め、挿入孔９３の内壁と流路管９１の外壁との両方に密着する。 In addition, when only the metal sheet 95 is cooled with the refrigerant before insertion into the insertion hole 93 and the thickness of the metal sheet 95 is reduced, the temperature of the metal sheet 95 returns to room temperature after insertion into the insertion hole 93, The metal sheet 95 is sandwiched between the inner wall of the insertion hole 93 and the outer wall of the flow channel tube 91. The metal sheet 95 is deformed so as to absorb the variation in the gap between the inner wall of the insertion hole 93 and the outer wall of the flow channel tube 91 to fill the gap, and the metal sheet 95 is formed between the inner wall of the insertion hole 93 and the outer wall of the flow channel tube 91. Adhere to both.

焼き嵌めでは、金属シート９５を流路管９１の外壁に巻き付け、加熱したリヤプラテン１３の挿入孔９３に金属シート９５及び流路管９１を挿入する。その後、リヤプラテン１３の温度が室温に戻ると、挿入孔９３の直径が縮み、挿入孔９３の内壁と流路管９１の外壁とで金属シート９５が挟まれる。金属シート９５は、挿入孔９３の内壁と流路管９１の外壁との間の隙間のばらつきを吸収するように変形して隙間を埋め、挿入孔９３の内壁と流路管９１の外壁との両方に密着する。 In shrink fitting, the metal sheet 95 is wound around the outer wall of the flow path pipe 91 and the metal sheet 95 and the flow path pipe 91 are inserted into the insertion hole 93 of the heated rear platen 13. Thereafter, when the temperature of the rear platen 13 returns to room temperature, the diameter of the insertion hole 93 is reduced, and the metal sheet 95 is sandwiched between the inner wall of the insertion hole 93 and the outer wall of the flow channel tube 91. The metal sheet 95 is deformed so as to absorb the variation in the gap between the inner wall of the insertion hole 93 and the outer wall of the flow channel tube 91 to fill the gap, and the metal sheet 95 is formed between the inner wall of the insertion hole 93 and the outer wall of the flow channel tube 91. Adhere to both.

このように、冷やし嵌め、焼き嵌めのいずれでも、金属シート９５は、挿入孔９３の内壁と流路管９１の外壁との間の隙間のばらつきを吸収するように変形して隙間を埋め、挿入孔９３の内壁と流路管９１の外壁との両方に密着する。よって、接触熱抵抗がさらに下がり、リヤプラテン１３の温調効率がさらに良くなる。また、上記隙間のばらつきを吸収するとき、柔らかい金属シート９５が選択的に変形し、硬い流路管９１の局所的な変形が抑えられるので、流路管９１の損傷が低減される。 Thus, in both cold fitting and shrink fitting, the metal sheet 95 is deformed so as to absorb the variation in the gap between the inner wall of the insertion hole 93 and the outer wall of the flow channel tube 91, and the gap is filled and inserted. It is in close contact with both the inner wall of the hole 93 and the outer wall of the channel tube 91. Therefore, the contact thermal resistance is further lowered, and the temperature regulation efficiency of the rear platen 13 is further improved. Further, when absorbing the gap variation, the soft metal sheet 95 is selectively deformed and local deformation of the hard flow channel pipe 91 is suppressed, so that damage to the flow path tube 91 is reduced.

尚、本実施形態の熱伝達部材は、金属で形成されるが、空気よりも高い熱伝導率を有していればよく、樹脂で形成されてもよい。また、熱伝達部材は、シート状であるが、リング状であってもよい。 In addition, although the heat transfer member of this embodiment is formed with a metal, it should just have thermal conductivity higher than air, and may be formed with resin. Further, the heat transfer member has a sheet shape, but may have a ring shape.

尚、本実施形態の流路管９１は、冷やし嵌め、又は焼き嵌めで挿入孔９３に固定されるが、その固定方法は、冷やし嵌め、焼き嵌めに限定されない。例えば、挿入孔９３に流路管９１を挿入しておき、挿入孔９３の内壁と流路管９１の外壁との間の隙間に加熱した溶融樹脂を流し込み、溶融樹脂を冷却固化する方法等がある。この場合、挿入孔９３の内壁と、流路管９１の外壁との間に、熱伝達部材としての樹脂層が介在する。樹脂層の硬さは、流路管９１の硬さよりも低くなる。 In addition, although the flow-path pipe 91 of this embodiment is fixed to the insertion hole 93 by cold fitting or shrink fitting, the fixing method is not limited to cold fitting or shrink fitting. For example, there is a method in which the flow path pipe 91 is inserted into the insertion hole 93, the heated molten resin is poured into the gap between the inner wall of the insertion hole 93 and the outer wall of the flow path pipe 91, and the molten resin is cooled and solidified. is there. In this case, a resin layer as a heat transfer member is interposed between the inner wall of the insertion hole 93 and the outer wall of the flow channel pipe 91. The hardness of the resin layer is lower than the hardness of the channel tube 91.

リヤプラテン１３の挿入孔９３は、積層鋼板（例えば外側積層鋼板７１）の積層方向（Ｙ方向）に延在し、例えば積層鋼板の一端部から他端部まで積層方向に延在する。よって、リヤプラテン１３の挿入孔９３に挿入される流路管９１が、積層鋼板（例えば外側積層鋼板７１）を構成する複数の電磁鋼板（例えば電磁鋼板８１、８２）の位置ずれを制限できる。 The insertion hole 93 of the rear platen 13 extends in the laminating direction (Y direction) of the laminated steel plates (for example, the outer laminated steel plates 71), and extends in the laminating direction from one end portion to the other end portion of the laminated steel plates, for example. Therefore, the flow path pipe 91 inserted into the insertion hole 93 of the rear platen 13 can limit displacement of a plurality of electromagnetic steel plates (for example, the electromagnetic steel plates 81 and 82) constituting the laminated steel plate (for example, the outer laminated steel plate 71).

リヤプラテン１３の挿入孔９３は、複数の積層鋼板（例えば２つの外側積層鋼板７１、７２、及び２つの内側積層鋼板７３、７４のいずれか一方）にわたって形成される。よって、リヤプラテン１３の挿入孔９３に挿入される流路管９１が、複数の積層鋼板の位置ずれを制限できる。 The insertion hole 93 of the rear platen 13 is formed over a plurality of laminated steel plates (for example, one of the two outer laminated steel plates 71 and 72 and the two inner laminated steel plates 73 and 74). Therefore, the flow path pipe 91 inserted into the insertion hole 93 of the rear platen 13 can limit the displacement of the plurality of laminated steel plates.

尚、本実施形態では、挿入孔９３の内壁と、流路管９１の外壁との間に熱伝達部材が介在するが、熱伝達部材がなくてもよい。つまり、挿入孔９３の内壁と、流路管９１の外壁とが冷やし嵌め又は焼き嵌めによって直接密着していてもよい。 In the present embodiment, the heat transfer member is interposed between the inner wall of the insertion hole 93 and the outer wall of the flow channel tube 91, but the heat transfer member may not be provided. That is, the inner wall of the insertion hole 93 and the outer wall of the flow channel pipe 91 may be in direct contact with each other by cold fitting or shrink fitting.

［第２実施形態］
上記第１実施形態のリヤプラテン１３は流路管９１を挿入する挿入部として挿入孔９３を有するが、本実施形態のリヤプラテンは挿入溝を有する点で相違する。以下、相違点を中心に説明する。 [Second Embodiment]
The rear platen 13 of the first embodiment has an insertion hole 93 as an insertion portion for inserting the flow channel tube 91, but the rear platen of the present embodiment is different in that it has an insertion groove. Hereinafter, the difference will be mainly described.

図５は、第２実施形態によるリヤプラテンを示す断面図である。図５に示すリヤプラテン１１３には挿入部としての挿入溝１９３が形成され、挿入溝１９３に流路管１９１が挿入される。挿入溝１９３は、リヤプラテン１１３の吸着面と反対側の面（前端面）や側面に形成される。 FIG. 5 is a sectional view showing a rear platen according to the second embodiment. The rear platen 113 shown in FIG. 5 is formed with an insertion groove 193 as an insertion portion, and the flow channel pipe 191 is inserted into the insertion groove 193. The insertion groove 193 is formed on a surface (front end surface) or a side surface opposite to the suction surface of the rear platen 113.

流路管１９１は、例えば角筒管であって、温調流体の流路を内部に有する。温調流体が流路管１９１の内部を流れるので、積層鋼板を積層方向に貫通する貫通孔が流路となる場合と異なり、電磁鋼板同士の間から温調流体が漏出することがない。また、温調流体がリヤプラテン１１３と直接接触しないので、リヤプラテン１１３の腐食が防止される。 The flow channel pipe 191 is, for example, a rectangular tube, and has a temperature control fluid flow channel therein. Since the temperature control fluid flows inside the flow channel pipe 191, unlike the case where the through hole penetrating the laminated steel plates in the stacking direction becomes the flow channel, the temperature control fluid does not leak between the electromagnetic steel plates. Further, since the temperature control fluid does not directly contact the rear platen 113, the corrosion of the rear platen 113 is prevented.

温調流体は、リヤプラテン１１３と熱交換し、リヤプラテン１１３を温調する。温調流体は、冷却水や空気などの冷媒であってよい。冷媒は、リヤプラテン１１３を冷却することで、電磁石４９のコイル４８の過熱を抑制する。尚、温調流体は、温水などの熱媒であってもよい。 The temperature adjusting fluid exchanges heat with the rear platen 113 to adjust the temperature of the rear platen 113. The temperature control fluid may be a coolant such as cooling water or air. The refrigerant cools the rear platen 113 to suppress overheating of the coil 48 of the electromagnet 49. The temperature control fluid may be a heat medium such as warm water.

流路管１９１は、リヤプラテン１１３の挿入溝１９３に挿入される。流路管１９１は、例えば冷やし嵌め、又は焼き嵌めで挿入溝１９３に固定されてよい。 The channel pipe 191 is inserted into the insertion groove 193 of the rear platen 113. The channel tube 191 may be fixed to the insertion groove 193 by, for example, cold fitting or shrink fitting.

冷やし嵌めでは、ドライアイスや液体窒素等の冷媒で流路管１９１を冷却し、縮ませたうえで、流路管１９１よりも高温（例えば室温）のリヤプラテン１１３の挿入溝１９３に挿入する。その後、流路管１９１の温度が室温に戻ると、流路管１９１が膨らみ、流路管１９１の外壁が断面矩形状の挿入溝１９３の互いに対向する内壁（側壁）で締め付けられる。 In the cold fitting, the flow path pipe 191 is cooled with a refrigerant such as dry ice or liquid nitrogen and contracted, and then inserted into the insertion groove 193 of the rear platen 113 having a temperature higher than that of the flow path pipe 191 (for example, room temperature). Thereafter, when the temperature of the channel tube 191 returns to room temperature, the channel tube 191 swells, and the outer wall of the channel tube 191 is tightened by inner walls (side walls) of the insertion grooves 193 having a rectangular cross section.

焼き嵌めでは、リヤプラテン１１３を加熱し、リヤプラテン１１３の挿入溝１９３の溝幅を広げたうえで、リヤプラテン１１３よりも低温（例えば室温）の流路管１９１を挿入溝１９３に挿入する。その後、リヤプラテン１１３の温度が室温に戻ると、挿入溝１９３の溝幅が狭くなり、断面矩形状の挿入溝１９３の互いに対向する内壁で流路管１９１が締め付けられる。 In shrink fitting, the rear platen 113 is heated to widen the groove width of the insertion groove 193 of the rear platen 113, and the flow path pipe 191 having a temperature lower than the rear platen 113 (for example, room temperature) is inserted into the insertion groove 193. Thereafter, when the temperature of the rear platen 113 returns to room temperature, the groove width of the insertion groove 193 becomes narrower, and the flow path pipe 191 is tightened by the mutually opposing inner walls of the insertion groove 193 having a rectangular cross section.

冷やし嵌め又は焼き嵌めによって挿入溝１９３の内壁と流路管１９１の外壁との間の隙間が少なくなり、接触熱抵抗が下がるので、リヤプラテン１１３の温調効率が良くなる。 The gap between the inner wall of the insertion groove 193 and the outer wall of the channel tube 191 is reduced by the cold fitting or shrink fitting, and the contact thermal resistance is lowered, so that the temperature regulation efficiency of the rear platen 113 is improved.

挿入溝１９３の内壁と、流路管１９１の外壁との間には、熱伝達部材としての金属シート１９５が介在してよい。金属シート１９５の硬さは、流路管１９１の硬さよりも低い（柔らかい）ことが好ましい。 A metal sheet 195 as a heat transfer member may be interposed between the inner wall of the insertion groove 193 and the outer wall of the flow channel pipe 191. The hardness of the metal sheet 195 is preferably lower (softer) than the hardness of the channel tube 191.

冷やし嵌めでは、金属シート１９５を流路管１９１の外壁に巻き付け、金属シート１９５及び流路管１９１をリヤプラテン１３の挿入溝１９３に挿入する。冷やし嵌めでは、挿入溝１９３への挿入前に、流路管１９１及び金属シート１９５の少なくともいずれか一方を冷媒で冷却する。 In the cold fitting, the metal sheet 195 is wound around the outer wall of the flow path pipe 191, and the metal sheet 195 and the flow path pipe 191 are inserted into the insertion groove 193 of the rear platen 13. In the cold fitting, at least one of the flow channel pipe 191 and the metal sheet 195 is cooled with a refrigerant before being inserted into the insertion groove 193.

例えば、挿入溝１９３への挿入前に流路管１９１のみを冷媒で冷却する場合、挿入溝１９３への挿入後に流路管９１の温度が室温に戻り、挿入溝１９３の内壁と流路管１９１の外壁とで金属シート１９５が挟まれ、薄く変形する。金属シート１９５の変形は、弾性変形でも塑性変形でもよい。金属シート１９５は、流路管１９１よりも柔らかい金属で形成されるので、挿入溝１９３の内壁と流路管１９１の外壁との間の隙間のばらつきを吸収するように変形して隙間を埋め、挿入溝１９３の内壁と流路管１９１の外壁との両方に密着する。 For example, when only the flow channel 191 is cooled with the refrigerant before insertion into the insertion groove 193, the temperature of the flow channel 91 returns to room temperature after insertion into the insertion groove 193, and the inner wall of the insertion groove 193 and the flow channel 191. The metal sheet 195 is sandwiched between the outer wall and the outer wall of the metal, and deforms thinly. The deformation of the metal sheet 195 may be elastic deformation or plastic deformation. Since the metal sheet 195 is formed of a softer metal than the flow channel pipe 191, the metal sheet 195 is deformed so as to absorb the variation in the gap between the inner wall of the insertion groove 193 and the outer wall of the flow channel pipe 191, and the gap is filled. It is in close contact with both the inner wall of the insertion groove 193 and the outer wall of the channel tube 191.

また、挿入溝１９３への挿入前に金属シート１９５のみを冷媒で冷却し、金属シート１９５の厚さを薄くする場合、挿入溝１９３への挿入後に金属シート１９５の温度が室温に戻り、金属シート１９５の厚さが厚くなり、挿入溝１９３の内壁と流路管１９１の外壁とで金属シート１９５が挟まれる。金属シート１９５は、挿入溝１９３の内壁と流路管１９１の外壁との間の隙間のばらつきを吸収するように変形して隙間を埋め、挿入溝１９３の内壁と流路管９１の外壁との両方に密着する。 Further, when only the metal sheet 195 is cooled with the refrigerant before insertion into the insertion groove 193 and the thickness of the metal sheet 195 is reduced, the temperature of the metal sheet 195 returns to room temperature after insertion into the insertion groove 193, and the metal sheet The thickness of 195 is increased, and the metal sheet 195 is sandwiched between the inner wall of the insertion groove 193 and the outer wall of the flow channel tube 191. The metal sheet 195 is deformed so as to absorb the variation in the gap between the inner wall of the insertion groove 193 and the outer wall of the flow channel pipe 191 to fill the gap, and the inner wall of the insertion groove 193 and the outer wall of the flow channel pipe 91 are Adhere to both.

焼き嵌めでは、金属シート１９５を流路管１９１の外壁に巻き付け、加熱したリヤプラテン１１３の挿入溝１９３に金属シート１９５及び流路管１９１を挿入する。その後、リヤプラテン１１３の温度が室温に戻ると、挿入溝１９３の溝幅が狭くなり、挿入溝１９３の内壁と流路管１９１の外壁とで金属シート１９５が挟まれる。金属シート１９５は、挿入溝１９３の内壁と流路管１９１の外壁との間の隙間のばらつきを吸収するように変形して隙間を埋め、挿入溝１９３の内壁と流路管１９１の外壁との両方に密着する。 In shrink fitting, the metal sheet 195 is wound around the outer wall of the channel tube 191, and the metal sheet 195 and the channel tube 191 are inserted into the insertion groove 193 of the heated rear platen 113. Thereafter, when the temperature of the rear platen 113 returns to room temperature, the groove width of the insertion groove 193 becomes narrow, and the metal sheet 195 is sandwiched between the inner wall of the insertion groove 193 and the outer wall of the flow channel tube 191. The metal sheet 195 is deformed so as to absorb the variation in the gap between the inner wall of the insertion groove 193 and the outer wall of the flow path pipe 191 to fill the gap, and the inner wall of the insertion groove 193 and the outer wall of the flow path pipe 191 Adhere to both.

このように、冷やし嵌め、焼き嵌めのいずれでも、金属シート１９５は、挿入溝１９３の内壁と流路管１９１の外壁との間の隙間のばらつきを吸収するように変形して隙間を埋め、挿入溝１９３の内壁と流路管１９１の外壁との両方に密着する。よって、接触熱抵抗がさらに下がり、リヤプラテン１１３の温調効率がさらに良くなる。また、上記隙間のばらつきを吸収するとき、柔らかい金属シート１９５が選択的に変形するので、硬い流路管１９１の局所的な変形が抑えられ、流路管１９１の損傷が低減される。 Thus, in both cold fitting and shrink fitting, the metal sheet 195 is deformed so as to absorb the variation in the gap between the inner wall of the insertion groove 193 and the outer wall of the flow channel pipe 191, and the gap is filled and inserted. The groove 193 is in close contact with both the inner wall and the outer wall of the channel tube 191. Therefore, the contact thermal resistance is further lowered, and the temperature regulation efficiency of the rear platen 113 is further improved. Further, when the variation in the gap is absorbed, the soft metal sheet 195 is selectively deformed, so that local deformation of the hard channel tube 191 is suppressed, and damage to the channel tube 191 is reduced.

尚、本実施形態の流路管１９１は、冷やし嵌め、又は焼き嵌めで挿入溝１９３に固定されるが、その固定方法は、冷やし嵌め、焼き嵌めに限定されない。例えば、挿入溝１９３に流路管１９１を挿入しておき、挿入溝１９１の内壁と流路管１９１の外壁との間の隙間に加熱した溶融樹脂を流し込み、溶融樹脂を冷却固化する方法等がある。この場合、挿入溝１９３の内壁と、流路管１９１の外壁との間に、熱伝達部材としての樹脂層が介在する。樹脂層の硬さは、流路管１９１の硬さよりも低くなる。 In addition, although the flow path pipe | tube 191 of this embodiment is fixed to the insertion groove 193 by cold fitting or shrink fitting, the fixing method is not limited to cold fitting or shrink fitting. For example, there is a method in which the flow path pipe 191 is inserted into the insertion groove 193, the molten resin is poured into a gap between the inner wall of the insertion groove 191 and the outer wall of the flow path pipe 191, and the molten resin is cooled and solidified. is there. In this case, a resin layer as a heat transfer member is interposed between the inner wall of the insertion groove 193 and the outer wall of the flow channel pipe 191. The hardness of the resin layer is lower than the hardness of the channel tube 191.

リヤプラテン１１３の挿入溝１９３は、積層鋼板（例えば図３に示す外側積層鋼板７１）の積層方向（Ｙ方向）に延在し、例えば積層鋼板の一端部から他端部まで積層方向に延在する。よって、リヤプラテン１１３の挿入溝１９３に挿入される流路管１９１が、積層鋼板（例えば外側積層鋼板７１）を構成する複数の電磁鋼板（例えば電磁鋼板８１、８２）の位置ずれを制限できる。 The insertion groove 193 of the rear platen 113 extends in the stacking direction (Y direction) of the laminated steel plates (for example, the outer laminated steel plate 71 shown in FIG. 3), and extends in the stacking direction from one end portion to the other end portion of the laminated steel plates, for example. . Therefore, the flow path pipe 191 inserted into the insertion groove 193 of the rear platen 113 can limit the displacement of a plurality of electromagnetic steel plates (for example, the electromagnetic steel plates 81 and 82) constituting the laminated steel plate (for example, the outer laminated steel plate 71).

リヤプラテン１１３の挿入溝１９３は、複数の積層鋼板（例えば図３に示す２つの外側積層鋼板７１、７２、及び２つの内側積層鋼板７３、７４のいずれか一方）にわたって形成される。よって、リヤプラテン１１３の挿入溝１９３に挿入される流路管１９１が、複数の積層鋼板の位置ずれを制限できる。 The insertion groove 193 of the rear platen 113 is formed over a plurality of laminated steel plates (for example, one of the two outer laminated steel plates 71 and 72 and the two inner laminated steel plates 73 and 74 shown in FIG. 3). Therefore, the flow path pipe 191 inserted into the insertion groove 193 of the rear platen 113 can limit the positional deviation of the plurality of laminated steel plates.

尚、本実施形態の流路管１９１は、一体物であるが、流路溝が形成された樋状部材と、樋状部材の流路溝が形成される面に固定される蓋部材とで構成されてもよい。この場合、樋状部材を挿入溝１９３に固定した後、樋状部材に蓋部材を固定してもよいし、樋状部材に蓋部材を固定した後、樋状部材を挿入溝１９３に固定してもよい。樋状部材と蓋部材との間には、温調流体の漏出を防止するシール部材が介装されてよい。 In addition, although the flow path pipe 191 of this embodiment is an integrated object, it is composed of a bowl-shaped member in which a flow path groove is formed and a lid member fixed to a surface on which the flow path groove of the bowl-shaped member is formed. It may be configured. In this case, after fixing the hook member to the insertion groove 193, the lid member may be fixed to the hook member, or after fixing the lid member to the hook member, the hook member is fixed to the insertion groove 193. May be. A seal member that prevents leakage of the temperature control fluid may be interposed between the bowl-shaped member and the lid member.

尚、本実施形態では、挿入溝１９３の内壁と、流路管１９１の外壁との間に熱伝達部材が介在するが、熱伝達部材がなくてもよい。つまり、挿入溝１９３の内壁と、流路管１９１の外壁とが冷やし嵌め又は焼き嵌めによって直接密着していてもよい。 In the present embodiment, the heat transfer member is interposed between the inner wall of the insertion groove 193 and the outer wall of the flow channel tube 191, but the heat transfer member may not be provided. That is, the inner wall of the insertion groove 193 and the outer wall of the flow channel tube 191 may be in direct contact with each other by cold fitting or shrink fitting.

以上、本発明の第１及び第２の実施形態について説明したが、本発明は上記実施形態に限定されるものではなく、特許請求の範囲に記載された本発明の要旨の範囲内において、種々の変形、置換が可能である。 Although the first and second embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the gist of the present invention described in the claims. Can be modified or replaced.

例えば、上記実施形態の流路管９１、１９１は、リヤプラテン１３、１１３の挿入部９３、１９３に挿入されているが、本発明を吸着板に適用してもよい。即ち、流路管９１、１９１は、吸着板２２の挿入部に挿入されてもよい。 For example, although the flow path pipes 91 and 191 of the above embodiment are inserted into the insertion portions 93 and 193 of the rear platens 13 and 113, the present invention may be applied to the suction plate. That is, the channel tubes 91 and 191 may be inserted into the insertion portion of the suction plate 22.

また、上記実施形態の流路管９１、１９１は、円筒管又は角筒管であるが、２重管であってもよい。２重管は内管及び外管で構成され、内管と外管との間の空間が温調流体の往路となり、内管の内側空間が温調流体の復路となる。２重管の先端部には、往路と復路とを連通するように蓋が設けられる。 Moreover, although the flow-path pipes 91 and 191 of the said embodiment are a cylindrical pipe or a rectangular tube, a double pipe may be sufficient. The double pipe is composed of an inner pipe and an outer pipe, and a space between the inner pipe and the outer pipe is a forward path for the temperature control fluid, and an inner space of the inner pipe is a return path for the temperature control fluid. A lid is provided at the tip of the double pipe so as to communicate the forward path and the backward path.

また、上記実施形態のリヤプラテン１３、１１３は、複数の電磁鋼板を積層してなる積層鋼板を有するが、積層鋼板を有さなくてもよく、例えば１枚の軟磁性板から削り出されてもよい。この場合、複数の電磁鋼板の位置ずれ防止が不要なので、流路管９１、１９１は、リヤプラテン１３、１１３を貫通しなくてもよく、例えば上記２重管で構成され、リヤプラテン１３、１１３の途中で途切れていてよい。 In addition, the rear platens 13 and 113 of the above embodiment have laminated steel plates formed by laminating a plurality of electromagnetic steel plates, but may not have laminated steel plates, for example, even if cut out from one soft magnetic plate. Good. In this case, since it is not necessary to prevent displacement of the plurality of electromagnetic steel plates, the flow path pipes 91 and 191 do not need to penetrate the rear platens 13 and 113. For example, the flow path pipes 91 and 191 are configured by the above-described double pipes. It can be interrupted.

１０射出成形機
１１固定プラテン（第１の固定部材）
１２可動プラテン（第１の可動部材）
１３リヤプラテン（第１のブロック、第２の固定部材）
１５固定金型
１６可動金型
１９金型装置
２２吸着板（第２のブロック、第２の可動部材）
２３吸着板の貫通孔
４１リヤプラテンの貫通孔
４５コイル溝
４６コア
４８コイル
４９電磁石
７１〜７４積層鋼板
８１〜８３電磁鋼板
９１流路管
９３リヤプラテンの挿入孔
９５金属シート 10 Injection Molding Machine 11 Fixed Platen (First Fixed Member)
12 Movable platen (first movable member)
13 Rear platen (first block, second fixing member)
DESCRIPTION OF SYMBOLS 15 Fixed mold 16 Movable mold 19 Mold apparatus 22 Suction plate (2nd block, 2nd movable member)
23 Through-hole 41 in adsorption plate Rear-plate through-hole 45 Coil groove 46 Core 48 Coil 49 Electromagnets 71-74 Laminated steel plates 81-83 Magnetic steel plate 91 Channel tube 93 Rear platen insertion hole 95 Metal sheet

Claims

A mold clamping force generation mechanism that includes a first block on which an electromagnet is formed and a second block that is attracted by the electromagnet, and generates a mold clamping force between the first block and the second block. Configured,
A channel pipe for flowing a temperature-controlled fluid is inserted into an insertion part formed in at least one of the first block and the second block, and the channel pipe is fixed to the insertion part by cold fitting or shrink fitting. An injection molding machine characterized by being made.

The injection molding machine according to claim 1, wherein a heat transfer member is interposed between an inner wall of the insertion portion and an outer wall of the flow channel tube.

A mold clamping force generation mechanism that includes a first block on which an electromagnet is formed and a second block that is attracted by the electromagnet, and generates a mold clamping force between the first block and the second block. Configured,
A channel tube for flowing a temperature-controlled fluid is inserted into an insertion portion formed in at least one of the first block and the second block,
An injection molding machine, wherein a heat transfer member is interposed between an inner wall of the insertion portion and an outer wall of the flow channel tube.

The hardness of the said heat transfer member is an injection molding machine as described in any one of Claims 1-3 lower than the hardness of the said flow-path pipe.

The at least one of the first block and the second block has a laminated steel plate formed by laminating a plurality of electromagnetic steel plates,
The injection molding machine according to any one of claims 1 to 4, wherein the insertion portion is formed in the laminated steel sheet and extends in a lamination direction of the laminated steel sheet.

A first fixing member to which a fixed mold is attached;
A first movable member to which a movable mold is attached;
A second movable member that moves with the first movable member;
A second fixed member disposed between the first movable member and the second movable member;
The second movable member and the second fixed member constitute a mold clamping force generating mechanism, and an electromagnet is formed on one of the second movable member and the second fixed member, and the other is composed of the electromagnet. An adsorbing part to be adsorbed is formed,
A channel pipe for flowing a temperature-controlled fluid is inserted into an insertion part formed in at least one of the first block and the second block, and the channel pipe is fixed to the insertion part by cold fitting or shrink fitting. An injection molding machine characterized by being made.

A first fixing member to which a fixed mold is attached;
A first movable member to which a movable mold is attached;
A second movable member that moves with the first movable member;
A second fixed member disposed between the first movable member and the second movable member;
The second movable member and the second fixed member constitute a mold clamping force generating mechanism, and an electromagnet is formed on one of the second movable member and the second fixed member, and the other is composed of the electromagnet. An adsorbing part to be adsorbed is formed,
A channel tube for flowing a temperature-controlled fluid is inserted into an insertion portion formed in at least one of the first block and the second block,
An injection molding machine, wherein a heat transfer member is interposed between an inner wall of the insertion portion and an outer wall of the flow channel tube.