WO2023095433A1 - Mold clamping device and injection-molding machine - Google Patents

Mold clamping device and injection-molding machine Download PDF

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Publication number
WO2023095433A1
WO2023095433A1 PCT/JP2022/035539 JP2022035539W WO2023095433A1 WO 2023095433 A1 WO2023095433 A1 WO 2023095433A1 JP 2022035539 W JP2022035539 W JP 2022035539W WO 2023095433 A1 WO2023095433 A1 WO 2023095433A1
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Prior art keywords
movable platen
platen
clamping device
mold clamping
ball screw
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PCT/JP2022/035539
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French (fr)
Japanese (ja)
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聡麻 三谷
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株式会社日本製鋼所
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Publication of WO2023095433A1 publication Critical patent/WO2023095433A1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/03—Injection moulding apparatus
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/64—Mould opening, closing or clamping devices

Definitions

  • the present invention relates to a mold clamping device having a fixed platen and a movable platen, which are connected by a plurality of sets of ball screw mechanisms, and an injection molding machine.
  • the injection molding machine or press machine is equipped with a mold clamping device that clamps the mold.
  • a mold clamping device comprising so-called two platens.
  • This mold clamping device is composed of a fixed platen, a movable platen, four sets of ball screw mechanisms connecting the fixed platen and the movable platen, and four servo motors provided in each ball screw mechanism. ing. When the four servomotors are driven, the four sets of ball screw mechanisms are driven to slide the movable platen relative to the fixed platen. That is, the mold is opened and closed.
  • the mold clamping device described in Patent Document 1 has two mold plates instead of three, so the mold clamping device can be configured compactly. Therefore, there is an excellent effect that the contact area can be made relatively small.
  • the thickness of the movable platen can be increased to increase the rigidity.
  • the weight of the movable platen increases and the size of the mold clamping device increases. Also, if the weight is too large, the load on the servomotor that drives the movable platen will be too large to be adopted.
  • an object of the present disclosure is to provide a mold clamping device and an injection molding machine in which the weight of the movable platen is small while having sufficient rigidity.
  • the present disclosure is directed to a mold clamping device that includes a fixed platen, a movable platen that is slidably provided with respect to the fixed platen, and a plurality of sets of ball screw mechanisms that connect them.
  • the present inventors found that the above problem can be solved by forming ribs on the surface of the movable platen opposite to the surface facing the fixed platen.
  • FIG. 1 is a front view showing an injection molding machine according to an embodiment
  • FIG. 1 is a perspective view showing a mold clamping device according to an embodiment
  • FIG. FIG. 2 is a plan view of a movable platen according to the embodiment
  • 1 is a front view of a mold clamping device according to an embodiment
  • FIG. It is a top view of the movable platen which concerns on 2nd Embodiment. It is a top view of the movable board
  • the mold clamping device is a fixed platen; a movable platen slidably provided with respect to the fixed platen; a plurality of sets of ball screw mechanisms that connect the fixed platen and the movable platen, The mold is opened and closed by driving the plurality of sets of ball screw mechanisms, Ribs are formed on the surface of the movable platen opposite to the surface facing the fixed platen.
  • the injection molding machine is a mold clamping device for clamping the mold; and an injection device for injecting the injection material
  • the mold clamping device includes a stationary platen, a movable platen slidably provided with respect to the fixed platen; a plurality of sets of ball screw mechanisms that connect the fixed platen and the movable platen, The mold is opened and closed by driving the plurality of sets of ball screw mechanisms, Ribs are formed on the surface of the movable platen opposite to the surface facing the fixed platen.
  • An injection molding machine 1 according to the present embodiment comprises a mold clamping device 2 provided on a bed B and an injection device 4, as shown in FIG.
  • the injection device 4 comprises a heating cylinder 6 , a screw 7 inserted in the heating cylinder 6 , and a screw driving device 8 for driving the screw 7 .
  • the heating cylinder 6 is provided with a hopper 10 and an injection nozzle 11 at its tip.
  • the injection material is fed from the hopper 10 and the screw 7 is rotated to melt the injection material, which is weighed at the tip of the screw 7 .
  • the screw 7 is driven in the axial direction, the injection material is injected.
  • the mold clamping device 2 consists of a so-called two-platen mold clamping device. That is, the mold clamping device 2 includes first and second mold plates 13 and 14, that is, a fixed platen 13 and a movable platen 14, as shown in FIG.
  • the stationary platen 13 is fixed on the bed B, and the movable platen 14 is placed on linear guides 15, 15 provided on the bed B.
  • the movable platen 14 is slidable in directions toward and away from the fixed platen 13 .
  • a fixed side mold 16 is attached to the stationary platen 13, and a movable side mold 17 is attached to the movable platen 14, respectively.
  • the number of ball screw mechanisms connecting the fixed platen and the movable platen is four.
  • a fixed platen 13 and a movable platen 14 are connected by four sets of ball screw mechanisms 18, 18, .
  • Each of the ball screw mechanisms 18, 18, . . . includes ball screws 19, 19, .
  • the movable platen 14 has through holes, and ball nuts 20, 20, . . . are fixed to the through holes. That is, the ball screws 19, 19, . . . are connected to the movable platen 14 via ball nuts 20, 20, . On the other hand, the ball screws 19, 19, .
  • the fixed platen 13 is provided with servo motors 22, 22, . . . which are connected to ball screws 19, 19, . Therefore, when the servomotors 22, 22, . . . are driven, the ball screws 19, 19, . That is, the molds 16 and 17 (see FIG. 1) are opened and closed.
  • the mold clamping device 2 is characterized by the movable platen 14, and has a structure that achieves both weight reduction and rigidity.
  • ribs 24 are formed on the movable platen 14 on the surface opposite to the surface facing the fixed platen 13 .
  • FIG. 3 shows a plan view of the movable platen 14, and the movable platen 14 is formed in a substantially square shape. Ribs 24 are radially formed on the square so as to extend from the center 28 of the square toward the four sets of ball screw mechanisms 18, 18, . In this way, when the surface of the movable platen opposite to the surface facing the fixed platen is viewed in plan, the ribs are preferably formed radially from the center of the movable platen.
  • a square has two line segments connecting the midpoints of opposite sides. That is, line segments 26 and 27 are shown.
  • the rib 24 is formed symmetrically with respect to these two line segments 26 and 27 .
  • rib 24 is rotated 90 degrees about center 28 of the square so that it overlaps rib 24 . That is, it has 90-degree rotational symmetry, that is, four-fold symmetry. Since the ribs 24 are formed symmetrically in this way, the force acting on the movable platen 14 is evenly distributed.
  • the movable platen when the surface of the movable platen facing the fixed platen and the surface opposite to the fixed platen are viewed in plan, the movable platen is formed in a square shape, and the ribs are formed in four-fold symmetry with respect to the center of the square. It is one of preferred embodiments.
  • the height of the ribs 24 is about 0.5 times the thickness of the movable platen 14 in this embodiment, it can be increased to 0.2 to 0.8 times.
  • the ribs 24 are formed on the movable platen 14 according to the present embodiment, the rigidity of the movable platen 14 is sufficiently large and hardly deforms elastically. Therefore, in the mold clamping device 2 according to the present embodiment, no load is applied to the ball screw mechanisms 18, 18 due to the inclination of the ball nuts 20, 20. FIG. Furthermore, since the movable platen 14 is not elastically deformed, an effect of stabilizing mold clamping can be obtained. Since the ribs 24 provide the rigidity of the movable platen 14 according to the present embodiment, the movable platen 14 is formed with hollowed portions. Therefore, the movable platen 14 is lightened. When the movable platen 14 is driven by the servomotors 22, 22, . . . (see FIG. 2) and the ball screw mechanisms 18, 18, .
  • FIG. 5 shows a movable platen 14A according to the second embodiment.
  • the ribs 24A formed on the movable platen 14A according to this embodiment differ in shape from the ribs 24 of the movable platen 14 (see FIG. 3) according to the first embodiment. , and four-fold symmetry with respect to the center 28 .
  • FIG. 6 shows a movable platen 14B according to the third embodiment. No rib 24B is formed near the center 28 of the square on this movable platen 14B. However, it is formed line-symmetrically with respect to the line segments 26 and 27 and has four-fold symmetry with respect to the center 28 .
  • the second and third movable plates 14A and 14B shown in FIGS. 5 and 6 also have high rigidity due to the ribs 24A and 24B.
  • FIG. 7 shows a movable platen 14C according to the fourth embodiment.
  • the movable platen 14C is rectangular rather than square.
  • a rib 24C formed on the movable platen 14C is also formed symmetrically with respect to the line segments 26 and 27.
  • the movable platen 14C according to the fourth embodiment also has high rigidity. In this way, when the surface of the movable platen facing the fixed platen and the surface on the opposite side are viewed in plan, the movable platen is formed in a rectangular shape, and the ribs are line segments connecting the midpoints of the opposite sides of the rectangle. It is also a preferred aspect that the is formed line-symmetrically with respect to.
  • the mold clamping device 2 (see FIG. 2) according to the present embodiment has four sets of ball screw mechanisms 18, 18, .
  • the number of sets of the ball screw mechanisms 18, 18, . . . can be changed.
  • two sets of ball screw mechanisms 18, 18 for connecting the fixed platen 13 and the movable platen 14 can be provided.
  • FIG. 8 shows a part of a mold clamping device 2D provided with such two sets of ball screw mechanisms 18, 18, that is, a movable platen 14D according to the fifth embodiment.
  • the two sets of ball screw mechanisms 18, 18 are arranged at two diagonal vertices among the four square vertexes when the movable platen 14D is viewed from above. In this embodiment, the other two vertices of the square are provided with guide rods 35,35.
  • the rib 24D formed on the movable platen 14D according to the fifth embodiment has a shape extending from the vicinity of the center 28 of the square toward the two pairs of ball screw mechanisms 18, 18 located on the diagonal line.
  • the rib 24D having such a shape can sufficiently prevent elastic deformation of the movable platen 14D, and can prevent the ball nuts 20, 20, . . . of the ball screw mechanisms 18, 18, .
  • FIG. Although the guide rods 35, 35 are provided in this embodiment, the guide rods 35, 35 are not essential. This is because the two sets of ball screw mechanisms 18, 18 also allow the movable platen 14D to slide smoothly.
  • injection molding machine 2 mold clamping device 4 injection device 6 heating cylinder 7 screw 8 screw driving device 10 hopper 11 injection nozzle 13 fixed platen 14 movable platen 15 linear guide 16 fixed side mold 17 movable side mold 18 ball screw mechanism 19 ball Screw 20 Ball nut 22 Servo motor 24 Rib 26, 27 Line segment 28 Center 30 Tensile force 31 Pushing force 33 Elastic deformation 35 Guide rod B Bed 2D Mold clamping device 14A, 14B, 14C, 14D Movable platen 24A, 24B, 24C, 24D rib

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)

Abstract

A mold clamping device (2) of an injection-molding machine (1) comprises: a stationary platen (13); a movable platen (14) that is provided so as to be capable of sliding relative to the stationary platen (13); and a plurality of ball screw mechanisms (18) that couple the stationary platen (13) and the movable platen (14). In the present disclosure, ribs (24) are formed on the surface of the movable platen (14) on the reverse side from the surface thereof facing the stationary platen (13).

Description

型締装置、および射出成形機Mold clamping device and injection molding machine
　本発明は、固定盤と可動盤とを備え、これらが複数組のボールねじ機構で連結されている型締装置、ならびに射出成形機に関するものである。 The present invention relates to a mold clamping device having a fixed platen and a movable platen, which are connected by a plurality of sets of ball screw mechanisms, and an injection molding machine.
　射出成形機もしくはプレス機には、金型を型締めする型締装置が設けられている。型締装置には色々な種類があるが、特許文献１にはいわゆる２プラテンからなる型締装置が記載されている。この型締装置は、固定盤と可動盤と、これら固定盤と可動盤とを連結する４組のボールねじ機構と、それぞれのボールねじ機構に設けられている４個のサーボモータとから構成されている。４個のサーボモータを駆動すると４組のボールねじ機構が駆動されて、可動盤が固定盤に対してスライドする。すなわち型開閉することになる。 The injection molding machine or press machine is equipped with a mold clamping device that clamps the mold. There are various types of mold clamping devices, and Patent Document 1 describes a mold clamping device comprising so-called two platens. This mold clamping device is composed of a fixed platen, a movable platen, four sets of ball screw mechanisms connecting the fixed platen and the movable platen, and four servo motors provided in each ball screw mechanism. ing. When the four servomotors are driven, the four sets of ball screw mechanisms are driven to slide the movable platen relative to the fixed platen. That is, the mold is opened and closed.
日本国特開平５－２６９７４８号公報Japanese Patent Laid-Open No. 5-269748
　特許文献１に記載の型締装置は、型盤が３個ではなく２個からなるので、型締装置をコンパクトに構成できる。したがって、比較的接地面積を小さくすることができるという優れた効果を奏する。しかしながら、解決すべき課題も見受けられる。具体的には、型締めするときに可動盤がわずかに弾性変形して、４組のボールねじ機構に負担がかかって劣化しやすいという問題である。詳しく説明すると、型締めするとき可動盤には４組のボールねじ機構から引張力が作用し、そして可動盤の中央に取り付けられている金型から押力が作用する。これらによって可動盤は弾性変形によりわずかに湾曲する。湾曲すると４組のボールねじ機構のボールナットが傾く。ボールねじに対してボールナットが傾いた状態でボールねじが回転すると負荷がかかって劣化しやすい。 The mold clamping device described in Patent Document 1 has two mold plates instead of three, so the mold clamping device can be configured compactly. Therefore, there is an excellent effect that the contact area can be made relatively small. However, there are also issues to be resolved. Specifically, there is a problem that the movable platen is slightly elastically deformed when the molds are clamped, and a load is applied to the four sets of ball screw mechanisms, which easily deteriorates. More specifically, when the mold is clamped, the movable platen is subjected to tensile force from four sets of ball screw mechanisms, and pushing force is applied from the mold attached to the center of the movable platen. Due to these, the movable platen is slightly curved due to elastic deformation. When bent, the ball nuts of the four sets of ball screw mechanisms incline. If the ball screw rotates while the ball nut is tilted with respect to the ball screw, a load is applied and it is likely to deteriorate.
　可動盤の弾性変形を防止するために、可動盤の厚さを厚くして剛性を大きくすることもできる。しかしながら可動盤の重量が大きくなり型締装置が大型化してしまう。また重量が大きいと可動盤を駆動するサーボモータの負荷が大きくなり採用することはできない。 In order to prevent elastic deformation of the movable platen, the thickness of the movable platen can be increased to increase the rigidity. However, the weight of the movable platen increases and the size of the mold clamping device increases. Also, if the weight is too large, the load on the servomotor that drives the movable platen will be too large to be adopted.
　以上のような問題を鑑み、本開示において、十分な剛性を備えていながら可動盤の重量が小さい型締装置、および射出成形機を提供することを目的とする。 In view of the above problems, an object of the present disclosure is to provide a mold clamping device and an injection molding machine in which the weight of the movable platen is small while having sufficient rigidity.
　その他の課題と新規な特徴は、本明細書の記述及び添付図面から明らかになるであろう。 Other issues and novel features will become apparent from the description and accompanying drawings of this specification.
　本開示は、固定盤と、この固定盤に対してスライド自在に設けられている可動盤と、これらを連結する複数組のボールねじ機構と、を備えた型締装置を対象とする。本発明者らは、可動盤の固定盤に対向する面と反対側の面にリブを形成することにより上記課題を解決できることを見出した。 The present disclosure is directed to a mold clamping device that includes a fixed platen, a movable platen that is slidably provided with respect to the fixed platen, and a plurality of sets of ball screw mechanisms that connect them. The present inventors found that the above problem can be solved by forming ribs on the surface of the movable platen opposite to the surface facing the fixed platen.
　本開示により、可動盤の剛性を大きく確保しながら重量を小さくすることができる型締装置および射出成形機を提供することができる。 According to the present disclosure, it is possible to provide a mold clamping device and an injection molding machine that can reduce the weight while ensuring high rigidity of the movable platen.
本実施の形態に係る射出成形機を示す正面図である。1 is a front view showing an injection molding machine according to an embodiment; FIG. 本実施の形態に係る型締装置を示す斜視図である。1 is a perspective view showing a mold clamping device according to an embodiment; FIG. 本実施の形態に係る可動盤の平面図である。FIG. 2 is a plan view of a movable platen according to the embodiment; 本実施の形態に係る型締装置の正面図である。1 is a front view of a mold clamping device according to an embodiment; FIG. 第２の実施の形態に係る可動盤の平面図である。It is a top view of the movable platen which concerns on 2nd Embodiment. 第３の実施の形態に係る可動盤の平面図である。It is a top view of the movable board|platen based on 3rd Embodiment. 第４の実施の形態に係る可動盤の平面図である。It is a top view of the movable board|platen based on 4th Embodiment. 第５の実施の形態に係る可動盤の平面図である。It is a top view of the movable board|platen which concerns on 5th Embodiment.
　以下、具体的な実施の形態について、図面を参照しながら詳細に説明する。ただし、以下の実施の形態に限定される訳ではない。説明を明確にするため、以下の記載及び図面は、適宜簡略化されている。各図面において、同一の要素には同一の符号が付されており、必要に応じて重複説明は省略されている。また、図面が煩雑にならないように、ハッチングが省略されている部分がある。 Specific embodiments will be described in detail below with reference to the drawings. However, it is not limited to the following embodiments. For clarity of explanation, the following description and drawings have been simplified where appropriate. In each drawing, the same elements are denoted by the same reference numerals, and redundant description is omitted as necessary. In addition, there are portions where hatching is omitted so as not to complicate the drawing.
　本実施の形態に係る型締装置は、
　固定盤と、
　該固定盤に対してスライド自在に設けられている可動盤と、
　前記固定盤と前記可動盤とを連結する複数組のボールねじ機構と、を備え、
　前記複数組のボールねじ機構を駆動すると型開閉するようになっており、
　前記可動盤の前記固定盤に対向する面と反対側の面にはリブが形成されている。 The mold clamping device according to this embodiment is
a fixed platen;
a movable platen slidably provided with respect to the fixed platen;
a plurality of sets of ball screw mechanisms that connect the fixed platen and the movable platen,
The mold is opened and closed by driving the plurality of sets of ball screw mechanisms,
Ribs are formed on the surface of the movable platen opposite to the surface facing the fixed platen.
　また、本実施の形態に係る射出成形機は、
　金型を型締めする型締装置と、
　射出材料を射出する射出装置とからなり、
　前記型締装置は、固定盤と、
　該固定盤に対してスライド自在に設けられている可動盤と、
　前記固定盤と前記可動盤とを連結する複数組のボールねじ機構と、を備え、
　前記複数組のボールねじ機構を駆動すると型開閉するようになっており、
　前記可動盤の前記固定盤に対向する面と反対側の面にはリブが形成されている。 Further, the injection molding machine according to the present embodiment is
a mold clamping device for clamping the mold;
and an injection device for injecting the injection material,
The mold clamping device includes a stationary platen,
a movable platen slidably provided with respect to the fixed platen;
a plurality of sets of ball screw mechanisms that connect the fixed platen and the movable platen,
The mold is opened and closed by driving the plurality of sets of ball screw mechanisms,
Ribs are formed on the surface of the movable platen opposite to the surface facing the fixed platen.
＜本実施の形態に係る射出成形機＞
　本実施の形態に係る射出成形機１は、図１に示されているように、ベッドＢに設けられている型締装置２と、射出装置４とから構成されている。 <Injection molding machine according to the present embodiment>
An injection molding machine 1 according to the present embodiment comprises a mold clamping device 2 provided on a bed B and an injection device 4, as shown in FIG.
＜射出装置＞
　射出装置４は加熱シリンダ６と、この加熱シリンダ６に入れられているスクリュ７と、スクリュ７を駆動するスクリュ駆動装置８とから構成されている。加熱シリンダ６にはホッパ１０が設けられ、そして先端に射出ノズル１１が設けられている。ホッパ１０から射出材料が投入され、そしてスクリュ７を回転して射出材料を溶融するとスクリュ７の先端に計量される。スクリュ７を軸方向に駆動すると射出材料が射出されるようになっている。 <Injection device>
The injection device 4 comprises a heating cylinder 6 , a screw 7 inserted in the heating cylinder 6 , and a screw driving device 8 for driving the screw 7 . The heating cylinder 6 is provided with a hopper 10 and an injection nozzle 11 at its tip. The injection material is fed from the hopper 10 and the screw 7 is rotated to melt the injection material, which is weighed at the tip of the screw 7 . When the screw 7 is driven in the axial direction, the injection material is injected.
＜型締装置＞
　本実施の形態に係る型締装置２は、いわゆる２プラテンの型締装置からなる。すなわち型締装置２は、図２に示されているように、第１、２の型盤１３、１４、つまり固定盤１３と可動盤１４とを備えている。固定盤１３はベッドＢ上に固定されており、可動盤１４はベッドＢ上に設けられたリニアガイド１５、１５に載せられている。すなわち可動盤１４は固定盤１３に接近・離間する方向にスライド自在になっている。固定盤１３には固定側金型１６が、そして可動盤１４には可動側金型１７がそれぞれ取り付けられている。 <Mold clamping device>
The mold clamping device 2 according to the present embodiment consists of a so-called two-platen mold clamping device. That is, the mold clamping device 2 includes first and second mold plates 13 and 14, that is, a fixed platen 13 and a movable platen 14, as shown in FIG. The stationary platen 13 is fixed on the bed B, and the movable platen 14 is placed on linear guides 15, 15 provided on the bed B. As shown in FIG. In other words, the movable platen 14 is slidable in directions toward and away from the fixed platen 13 . A fixed side mold 16 is attached to the stationary platen 13, and a movable side mold 17 is attached to the movable platen 14, respectively.
　本実施の形態において、固定盤と可動盤とを連結するボールねじ機構は４組であることが好ましい。
　本実施の形態に係る型締装置２は、固定盤１３と可動盤１４とが４組のボールねじ機構１８、１８、…によって連結されている。それぞれのボールねじ機構１８、１８、…は、ボールねじ１９、１９、…と、ボールねじ１９、１９、…が螺合するボールナット２０、２０、…とを備えている。 In this embodiment, it is preferable that the number of ball screw mechanisms connecting the fixed platen and the movable platen is four.
In the mold clamping device 2 according to this embodiment, a fixed platen 13 and a movable platen 14 are connected by four sets of ball screw mechanisms 18, 18, . Each of the ball screw mechanisms 18, 18, . . . includes ball screws 19, 19, .
　図２には示されていないが、可動盤１４には貫通孔が開けられており、この貫通孔にボールナット２０、２０、…が固着されている。つまりボールねじ１９、１９、…はボールナット２０、２０、…を介して可動盤１４に接続されている。一方、ボールねじ１９、１９、…は、固定盤１３を貫通し、固定盤１３に対して回転可能に支持されている。固定盤１３にはサーボモータ２２、２２、…が設けられ、ボールねじ１９、１９、…と接続されている。したがって、サーボモータ２２、２２、…を駆動するとボールねじ１９、１９、…が回転し、可動盤１４がスライドすることになる。すなわち金型１６、１７（図１参照）が型開閉される。 Although not shown in FIG. 2, the movable platen 14 has through holes, and ball nuts 20, 20, . . . are fixed to the through holes. That is, the ball screws 19, 19, . . . are connected to the movable platen 14 via ball nuts 20, 20, . On the other hand, the ball screws 19, 19, . The fixed platen 13 is provided with servo motors 22, 22, . . . which are connected to ball screws 19, 19, . Therefore, when the servomotors 22, 22, . . . are driven, the ball screws 19, 19, . That is, the molds 16 and 17 (see FIG. 1) are opened and closed.
＜可動盤のリブ＞
　本実施の形態に係る型締装置２は、可動盤１４に特徴があり、軽量化と剛性の確保とを両立させる構造になっている。具体的には、可動盤１４には、固定盤１３に対向する面と反対側の面において、リブ２４が形成されている。図３には、可動盤１４を平面視した様子が示されており、可動盤１４は略正方形に形成されている。この正方形に対して、正方形の中心２８から４組のボールねじ機構１８、１８、…に向かうように、リブ２４が放射状に形成されている。
　このように、可動盤の固定盤に対向する面と反対側の面を平面視したとき、リブは可動盤の中心から放射状に形成されていることが好ましい。 <Rib of movable plate>
The mold clamping device 2 according to the present embodiment is characterized by the movable platen 14, and has a structure that achieves both weight reduction and rigidity. Specifically, ribs 24 are formed on the movable platen 14 on the surface opposite to the surface facing the fixed platen 13 . FIG. 3 shows a plan view of the movable platen 14, and the movable platen 14 is formed in a substantially square shape. Ribs 24 are radially formed on the square so as to extend from the center 28 of the square toward the four sets of ball screw mechanisms 18, 18, .
In this way, when the surface of the movable platen opposite to the surface facing the fixed platen is viewed in plan, the ribs are preferably formed radially from the center of the movable platen.
　正方形には対辺の中点同士を結ぶ線分が２本存在する。すなわち線分２６、２７である。これら２本の線分２６、２７に対して、リブ２４は線対称に形成されている。あるいは、リブ２４を正方形の中心２８を中心に９０度回転させると、リブ２４に重なる。つまり９０度の回転対称つまり４回対称になっている。このようにリブ２４は対称に形成されているので、可動盤１４に作用する力が均一に分散することになる。すなわち、可動盤の固定盤に対向する面と反対側の面を平面視したとき、可動盤は正方形状に形成されており、リブは、前記正方形の中心に対して、４回対称に形成されていることが好ましい態様の一つである。
　なお、可動盤１４の厚さに対するリブ２４の高さは、本実施の形態において約０．５倍になっているが、０．２～０．８倍等にすることができる。 A square has two line segments connecting the midpoints of opposite sides. That is, line segments 26 and 27 are shown. The rib 24 is formed symmetrically with respect to these two line segments 26 and 27 . Alternatively, rib 24 is rotated 90 degrees about center 28 of the square so that it overlaps rib 24 . That is, it has 90-degree rotational symmetry, that is, four-fold symmetry. Since the ribs 24 are formed symmetrically in this way, the force acting on the movable platen 14 is evenly distributed. That is, when the surface of the movable platen facing the fixed platen and the surface opposite to the fixed platen are viewed in plan, the movable platen is formed in a square shape, and the ribs are formed in four-fold symmetry with respect to the center of the square. It is one of preferred embodiments.
Although the height of the ribs 24 is about 0.5 times the thickness of the movable platen 14 in this embodiment, it can be increased to 0.2 to 0.8 times.
＜リブの作用＞
　型締装置２において型締めをすると、図４に示されているように、可動盤１４には複数の力が作用する。まず、４組のボールねじ機構１８、１８、によって引張力３０、３０が作用する。次いで金型１７から押力３１が作用する。引張力３０、３０は可動盤１４の端部に作用し、押力３１は可動盤１４の中央に作用する。これらの力３０、３１は符号３３で示されているように、可動盤１４に対して弾性変形させるように作用する。このような弾性変形が生じてしまうと、可動盤１４に固定されているボールナット２０、２０が傾き、ボールねじ機構１８、１８に大きな負荷が生じる。 <Function of ribs>
When the mold is clamped by the mold clamping device 2, multiple forces act on the movable platen 14 as shown in FIG. First, tensile forces 30, 30 are applied by the four sets of ball screw mechanisms 18, 18. As shown in FIG. A pressing force 31 is then applied from the mold 17 . The tensile forces 30 , 30 act on the ends of the movable platen 14 and the pushing force 31 acts on the center of the movable platen 14 . These forces 30 and 31 act to elastically deform the movable platen 14 as indicated by reference numeral 33 . If such elastic deformation occurs, the ball nuts 20, 20 fixed to the movable platen 14 will tilt, and a large load will be applied to the ball screw mechanisms 18, 18. FIG.
　しかしながら、本実施の形態に係る可動盤１４にはリブ２４が形成されているので、可動盤１４の剛性は十分に大きくほとんど弾性変形しない。したがって、本実施の形態に係る型締装置２において、ボールねじ機構１８、１８にはボールナット２０、２０の傾きに起因する負荷は発生しない。さらには、可動盤１４が弾性変形しないので、型締めが安定する効果も得られる。このように本実施の形態に係る可動盤１４の剛性はリブ２４によって得られるようになっているので、可動盤１４にはくり抜かれた部分が形成されている。したがって可動盤１４は軽量化されている。サーボモータ２２、２２、…（図２参照）とボールねじ機構１８、１８、…とによって可動盤１４を駆動するとき、駆動力は少なくて済むという効果も得られる。 However, since the ribs 24 are formed on the movable platen 14 according to the present embodiment, the rigidity of the movable platen 14 is sufficiently large and hardly deforms elastically. Therefore, in the mold clamping device 2 according to the present embodiment, no load is applied to the ball screw mechanisms 18, 18 due to the inclination of the ball nuts 20, 20. FIG. Furthermore, since the movable platen 14 is not elastically deformed, an effect of stabilizing mold clamping can be obtained. Since the ribs 24 provide the rigidity of the movable platen 14 according to the present embodiment, the movable platen 14 is formed with hollowed portions. Therefore, the movable platen 14 is lightened. When the movable platen 14 is driven by the servomotors 22, 22, . . . (see FIG. 2) and the ball screw mechanisms 18, 18, .
＜変形例＞
　本実施の形態は色々な変形が可能である。図５には第２の実施の形態に係る可動盤１４Ａが示されている。この実施の形態に係る可動盤１４Ａに形成されているリブ２４Ａは第１の実施の形態に係る可動盤１４（図３参照）のリブ２４と形状が相違しているが、線分２６、２７に対して線対称に形成され、中心２８に対して４回対称になっている。図６には第３の実施の形態に係る可動盤１４Ｂが示されている。この可動盤１４Ｂにおいて正方形の中心２８の近傍にはリブ２４Ｂが形成されていない。しかしながら、線分２６、２７に対して線対称に形成され、中心２８に対して４回対称になっている。図５、６に記載の第２、３の可動盤１４Ａ、１４Ｂも、リブ２４Ａ、２４Ｂによって高い剛性を備えている。 <Modification>
Various modifications are possible for this embodiment. FIG. 5 shows a movable platen 14A according to the second embodiment. The ribs 24A formed on the movable platen 14A according to this embodiment differ in shape from the ribs 24 of the movable platen 14 (see FIG. 3) according to the first embodiment. , and four-fold symmetry with respect to the center 28 . FIG. 6 shows a movable platen 14B according to the third embodiment. No rib 24B is formed near the center 28 of the square on this movable platen 14B. However, it is formed line-symmetrically with respect to the line segments 26 and 27 and has four-fold symmetry with respect to the center 28 . The second and third movable plates 14A and 14B shown in FIGS. 5 and 6 also have high rigidity due to the ribs 24A and 24B.
　図７には、第４の実施の形態に係る可動盤１４Ｃが示されている。この可動盤１４Ｃは正方形ではなく、長方形状を呈している。この可動盤１４Ｃに形成されているリブ２４Ｃも、線分２６、２７に対して線対称に形成されている。この第４の実施の形態に係る可動盤１４Ｃも高い剛性を備えている。
　このように、可動盤の固定盤に対向する面と反対側の面を平面視したとき、可動盤は長方形状に形成されており、リブは、前記長方形の対辺の中点同士を結ぶ線分に対して、線対称に形成されていることも好ましい態様である。 FIG. 7 shows a movable platen 14C according to the fourth embodiment. The movable platen 14C is rectangular rather than square. A rib 24C formed on the movable platen 14C is also formed symmetrically with respect to the line segments 26 and 27. As shown in FIG. The movable platen 14C according to the fourth embodiment also has high rigidity.
In this way, when the surface of the movable platen facing the fixed platen and the surface on the opposite side are viewed in plan, the movable platen is formed in a rectangular shape, and the ribs are line segments connecting the midpoints of the opposite sides of the rectangle. It is also a preferred aspect that the is formed line-symmetrically with respect to.
　本実施の形態に係る型締装置２（図２参照）は、固定盤１３と可動盤１４とを連結するボールねじ機構１８、１８、…は４組になっている。このボールねじ機構１８、１８、…の組数を変形することができる。例えば固定盤１３と可動盤１４とを連結するボールねじ機構１８、１８を２組とすることができる。図８には、このような２組のボールねじ機構１８、１８を備えた型締装置２Ｄの一部、つまり第５の実施の形態に係る可動盤１４Ｄが示されている。２組のボールねじ機構１８、１８は、可動盤１４Ｄを平面視したとき、正方形の４個の頂点のうち、対角の２個の頂点に配置されている。この実施の形態において、正方形の他の２個の頂点には、ガイドロッド３５、３５が設けられている。 The mold clamping device 2 (see FIG. 2) according to the present embodiment has four sets of ball screw mechanisms 18, 18, . The number of sets of the ball screw mechanisms 18, 18, . . . can be changed. For example, two sets of ball screw mechanisms 18, 18 for connecting the fixed platen 13 and the movable platen 14 can be provided. FIG. 8 shows a part of a mold clamping device 2D provided with such two sets of ball screw mechanisms 18, 18, that is, a movable platen 14D according to the fifth embodiment. The two sets of ball screw mechanisms 18, 18 are arranged at two diagonal vertices among the four square vertexes when the movable platen 14D is viewed from above. In this embodiment, the other two vertices of the square are provided with guide rods 35,35.
　第５の実施の形態に係る可動盤１４Ｄに形成されているリブ２４Ｄは、正方形の中心２８近傍から、対角線上に位置する２組のボールねじ機構１８、１８に向かって伸びた形状になっている。このような形状のリブ２４Ｄによって十分に可動盤１４Ｄの弾性変形を防止することができ、ボールねじ機構１８、１８、…のボールナット２０、２０、…の傾きを防止できる。型締力を発生させるとき、可動盤１４Ｄに対して２組のボールねじ機構１８、１８から引張力が作用するが、ガイドロッド３５、３５から引張力は作用しないからである。なお、この実施の形態にはガイドロッド３５、３５が設けられているが、ガイドロッド３５、３５は必須ではない。２組のボールねじ機構１８、１８によっても、可動盤１４Ｄを滑らかにスライドさせることができるからである。 The rib 24D formed on the movable platen 14D according to the fifth embodiment has a shape extending from the vicinity of the center 28 of the square toward the two pairs of ball screw mechanisms 18, 18 located on the diagonal line. there is The rib 24D having such a shape can sufficiently prevent elastic deformation of the movable platen 14D, and can prevent the ball nuts 20, 20, . . . of the ball screw mechanisms 18, 18, . This is because when a mold clamping force is generated, a tensile force acts on the movable platen 14D from the two sets of ball screw mechanisms 18, 18, but no tensile force acts from the guide rods 35, 35. FIG. Although the guide rods 35, 35 are provided in this embodiment, the guide rods 35, 35 are not essential. This is because the two sets of ball screw mechanisms 18, 18 also allow the movable platen 14D to slide smoothly.
　以上、本発明者によってなされた発明を実施の形態に基づき具体的に説明したが、本発明は既に述べた実施の形態に限定されるものではなく、その要旨を逸脱しない範囲において種々の変更が可能であることはいうまでもない。以上で説明した複数の例は、適宜組み合わせて実施されることもできる。 The invention made by the present inventor has been specifically described above based on the embodiments, but the present invention is not limited to the embodiments already described, and various modifications can be made without departing from the scope of the invention. It goes without saying that this is possible. A plurality of examples described above can also be implemented in combination as appropriate.
　本開示によれば、可動盤の剛性を大きく確保しながら重量を小さくすることができる型締装置および射出成形機を提供することができる。 According to the present disclosure, it is possible to provide a mold clamping device and an injection molding machine that can reduce the weight while ensuring high rigidity of the movable platen.
　本発明を詳細にまた特定の実施態様を参照して説明したが、本発明の精神と範囲を逸脱することなく様々な変更や修正を加えることができることは当業者にとって明らかである。
　本出願は、２０２１年１１月２５日出願の日本特許出願（特願２０２１－１９０７１４）に基づくものであり、その内容はここに参照として取り込まれる。 Although the present invention has been described in detail and with reference to specific embodiments, it will be apparent to those skilled in the art that various changes and modifications can be made without departing from the spirit and scope of the invention.
This application is based on a Japanese patent application (Japanese Patent Application No. 2021-190714) filed on November 25, 2021, the contents of which are incorporated herein by reference.
　　１　　射出成形機　　　　　　　　　２　　型締装置
　　４　　射出装置　　　　　　　　　　６　　加熱シリンダ
　　７　　スクリュ　　　　　　　　　　８　　スクリュ駆動装置
　１０　　ホッパ　　　　　　　　　　１１　　射出ノズル
　１３　　固定盤　　　　　　　　　　１４　　可動盤
　１５　　リニアガイド　　　　　　　１６　　固定側金型
　１７　　可動側金型　　　　　　　　１８　　ボールねじ機構
　１９　　ボールねじ　　　　　　　　２０　　ボールナット
　２２　　サーボモータ　　　　　　　２４　　リブ
　２６、２７　線分　　　　　　　　　２８　　中心
　３０　　引張力　　　　　　　　　　３１　　押力
　３３　　弾性変形　　　　　　　　　３５　　ガイドロッド
　　Ｂ　　ベッド　　　　　　　　　　２Ｄ　　型締装置
　１４Ａ、１４Ｂ、１４Ｃ、１４Ｄ　可動盤
　２４Ａ、２４Ｂ、２４Ｃ、２４Ｄ　リブ 1 injection molding machine 2 mold clamping device 4 injection device 6 heating cylinder 7 screw 8 screw driving device 10 hopper 11 injection nozzle 13 fixed platen 14 movable platen 15 linear guide 16 fixed side mold 17 movable side mold 18 ball screw mechanism 19 ball Screw 20 Ball nut 22 Servo motor 24 Rib 26, 27 Line segment 28 Center 30 Tensile force 31 Pushing force 33 Elastic deformation 35 Guide rod B Bed 2D Mold clamping device 14A, 14B, 14C, 14D Movable platen 24A, 24B, 24C, 24D rib

Claims (10)

  1. 　固定盤と、
    　該固定盤に対してスライド自在に設けられている可動盤と、
    　前記固定盤と前記可動盤とを連結する複数組のボールねじ機構と、を備え、
    　前記複数組のボールねじ機構を駆動すると型開閉するようになっており、
    　前記可動盤の前記固定盤に対向する面と反対側の面にはリブが形成されている、型締装置。     a fixed platen;
    a movable platen slidably provided with respect to the fixed platen;
    a plurality of sets of ball screw mechanisms that connect the fixed platen and the movable platen,
    The mold is opened and closed by driving the plurality of sets of ball screw mechanisms,
    A mold clamping device, wherein ribs are formed on the surface of the movable platen opposite to the surface facing the fixed platen.
  2. 　前記固定盤と前記可動盤とを連結する前記ボールねじ機構は４組である、請求項１に記載の型締装置。 The mold clamping device according to claim 1, wherein said ball screw mechanisms connecting said fixed platen and said movable platen are provided in four sets.
  3. 　前記反対側の面を平面視したとき、前記可動盤は長方形状に形成されており、前記リブは、前記長方形の対辺の中点同士を結ぶ線分に対して、線対称に形成されている、請求項１または２に記載の型締装置。 When the opposite side surface is viewed in plan, the movable platen is formed in a rectangular shape, and the ribs are formed symmetrically with respect to a line segment connecting the midpoints of opposite sides of the rectangle. , The mold clamping device according to claim 1 or 2.
  4. 　前記反対側の面を平面視したとき、前記可動盤は正方形状に形成されており、前記リブは、前記正方形の中心に対して、４回対称に形成されている、請求項１または２に記載の型締装置。 3. The apparatus according to claim 1, wherein said movable platen is formed in a square shape when said opposite surface is viewed in plan, and said ribs are formed in 4-fold symmetry with respect to the center of said square. Clamping device as described.
  5. 　前記反対側の面を平面視したとき、前記リブは前記可動盤の中心から放射状に形成されている、請求項１～４のいずれかの項に記載の型締装置。 The mold clamping device according to any one of claims 1 to 4, wherein the ribs are radially formed from the center of the movable platen when viewed from the opposite side.
  6. 　金型を型締めする型締装置と、
    　射出材料を射出する射出装置とからなり、
    　前記型締装置は、固定盤と、
    　該固定盤に対してスライド自在に設けられている可動盤と、
    　前記固定盤と前記可動盤とを連結する複数組のボールねじ機構と、を備え、
    　前記複数組のボールねじ機構を駆動すると型開閉するようになっており、
    　前記可動盤の前記固定盤に対向する面と反対側の面にはリブが形成されている、射出成形機。     a mold clamping device for clamping the mold;
    and an injection device for injecting the injection material,
    The mold clamping device includes a stationary platen,
    a movable platen slidably provided with respect to the fixed platen;
    a plurality of sets of ball screw mechanisms that connect the fixed platen and the movable platen,
    The mold is opened and closed by driving the plurality of sets of ball screw mechanisms,
    An injection molding machine, wherein ribs are formed on the surface of the movable platen opposite to the surface facing the fixed platen.
  7. 　前記固定盤と前記可動盤とを連結する前記ボールねじ機構は４組である、請求項６に記載の射出成形機。 The injection molding machine according to claim 6, wherein there are four sets of said ball screw mechanisms connecting said fixed platen and said movable platen.
  8. 　前記反対側の面を平面視したとき、前記可動盤は長方形状に形成されており、前記リブは、前記長方形の対辺の中点同士を結ぶ線分に対して、線対称に形成されている、請求項６または７に記載の射出成形機。 When the opposite side surface is viewed in plan, the movable platen is formed in a rectangular shape, and the ribs are formed symmetrically with respect to a line segment connecting the midpoints of opposite sides of the rectangle. , an injection molding machine according to claim 6 or 7.
  9. 　前記反対側の面を平面視したとき、前記可動盤は正方形状に形成されており、前記リブは、前記正方形の中心に対して、４回対称に形成されている、請求項６または７に記載の射出成形機。 8. The apparatus according to claim 6 or 7, wherein said movable platen is formed in a square shape when said opposite surface is viewed in plan, and said ribs are formed in 4-fold symmetry with respect to the center of said square. Injection molding machine as described.
  10. 　前記反対側の面を平面視したとき、前記リブは前記可動盤の中心から放射状に形成されている、請求項６～９のいずれかの項に記載の射出成形機。 The injection molding machine according to any one of claims 6 to 9, wherein said ribs are formed radially from the center of said movable platen when viewed from the opposite side in plan view.
PCT/JP2022/035539 2021-11-25 2022-09-22 Mold clamping device and injection-molding machine WO2023095433A1 (en)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0420422Y2 (en) * 1990-10-06 1992-05-11
JP2009066774A (en) * 2007-09-10 2009-04-02 Mitsubishi Heavy Industries Plastic Technology Co Ltd Mold platen, clamping device and injection molding machine

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0420422Y2 (en) * 1990-10-06 1992-05-11
JP2009066774A (en) * 2007-09-10 2009-04-02 Mitsubishi Heavy Industries Plastic Technology Co Ltd Mold platen, clamping device and injection molding machine

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