WO2023095651A1 - Mold-clamping device, and injection-molding machine - Google Patents

Mold-clamping device, and injection-molding machine Download PDF

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Publication number
WO2023095651A1
WO2023095651A1 PCT/JP2022/042153 JP2022042153W WO2023095651A1 WO 2023095651 A1 WO2023095651 A1 WO 2023095651A1 JP 2022042153 W JP2022042153 W JP 2022042153W WO 2023095651 A1 WO2023095651 A1 WO 2023095651A1
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Prior art keywords
mold
ball screw
clamping device
platen
closing servomotor
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PCT/JP2022/042153
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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 WO2023095651A1 publication Critical patent/WO2023095651A1/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
    • 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
    • B29C45/66—Mould opening, closing or clamping devices mechanical

Definitions

  • the present invention relates to a mold clamping device having first and second mold plates and a plurality of sets of ball screw mechanisms connecting the first and second mold plates, 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 consists of first and second mold plates, that is, a fixed platen and a movable platen, four sets of ball screw mechanisms connecting them, and four mold opening/closing servos provided in each ball screw mechanism. It consists of a motor. When the four die opening/closing servo motors are driven, the four sets of ball screw mechanisms are driven to slide the movable platen relative to the stationary platen. That is, the mold is opened and closed.
  • the mold clamping device described in Patent Document 1 has two mold plates, 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 mold opening/closing servomotor is fixed to the stationary platen, so the heat of the stationary platen is also conducted to the mold opening/closing servomotor. In other words, the mold opening/closing servomotor also becomes hot. Then, there is a problem that the permanent magnet is affected and the output torque is lowered.
  • an object of the present disclosure is to provide a mold clamping device and an injection molding machine that prevent deterioration in the performance of a mold opening/closing servomotor.
  • the present disclosure is directed to a mold clamping device that includes first and second mold plates, a plurality of sets of ball screw mechanisms that connect them, and a mold opening/closing servomotor.
  • the ball screw mechanism includes a ball screw and a ball nut.
  • the ball screw is rotatably supported by the first mold platen via a bearing mechanism, and the end of the ball screw is connected to the mold opening/closing servomotor. It is the axis of rotation.
  • the ball nut is fixed to the second mold platen.
  • FIG. 1 is a front view showing an injection molding machine according to this embodiment.
  • FIG. 2 is a perspective view showing the mold clamping device according to this embodiment.
  • FIG. 3 is a front cross-sectional view showing part of the mold clamping device according to this embodiment.
  • FIG. 4 is a perspective view showing a heat insulating material according to this embodiment.
  • FIG. 5 is a perspective view showing a part of the stationary platen according to the second embodiment, and showing a servomotor mounting location where a mold opening/closing servomotor is mounted.
  • the mold clamping device is first and second mold plates; a plurality of sets of ball screw mechanisms that connect the first and second mold plates; a mold opening/closing servomotor that drives the ball screw mechanism;
  • the ball screw mechanism includes a ball screw, a ball nut screwed onto the ball screw;
  • the ball screw is rotatably supported by the first mold plate via a bearing mechanism, and an end of the ball screw serves as a rotation shaft of the mold opening/closing servomotor,
  • the ball nut is fixed to the second mold platen,
  • the mold opening/closing servomotor is provided via a heat insulating means with respect to the first mold 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 first and second mold plates, a plurality of sets of ball screw mechanisms that connect the first and second mold plates; a mold opening/closing servomotor that drives the ball screw mechanism;
  • the ball screw mechanism includes a ball screw, a ball nut screwed onto the ball screw;
  • the ball screw is rotatably supported by the first mold plate via a bearing mechanism, and an end of the ball screw serves as a rotation shaft of the mold opening/closing servomotor,
  • the ball nut is fixed to the second mold platen,
  • the mold opening/closing servomotor is provided via a heat insulating means with respect to the first mold 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 stationary mold 16 is attached to the stationary platen 13, and a movable mold 17 is attached to the movable platen 14, respectively.
  • the ball screw mechanisms connecting the fixed platen and the movable platen consist of four sets.
  • 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 stationary platen 13 is provided with mold opening/closing servomotors 22, 22, . . . which are connected to ball screws 19, 19, . Therefore, when the mold opening/closing 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 stationary platen 13 has a through hole 24, and the ball screw 19 is inserted into the through hole 24.
  • the ball screw 19 is formed with a stepped portion 25 having a smaller outer diameter, and a bearing mechanism 26 is inserted in the stepped portion 25 .
  • a male thread is formed in a part of the stepped portion 25, and a lock nut 28 is screwed thereon.
  • An annular bearing retainer 29 is fixed to the stationary platen 13 , and the bearing mechanism 26 is sandwiched between the bearing retainer 29 on the stationary platen 13 side and the lock nut 28 on the ball screw 19 side. In this manner, the ball screw 19 is rotatably attached to the stationary platen 13 via the bearing mechanism 26 .
  • the die opening/closing servomotor 22 comprises a stator 30 and a rotor 31 , and the rotor 31 is fixed to the end of the ball screw 19 . In other words, the load in the thrust direction is not applied to the mold opening/closing servomotor 22 .
  • the mold clamping device 2 is characterized in that the mold opening/closing servomotor 22 is provided to the stationary platen 13 via heat insulating means.
  • the heat insulating means is made of heat insulating material 35 .
  • the heat insulating material 35 may be made of any material as long as it has a heat insulating effect and heat resistance. For example, it can be composed of silica wool, ceramic fiber, glass wool, or the like.
  • FIG. 4 shows the heat insulating material 35 according to this embodiment.
  • the heat insulating material 35 is formed in a disc shape and has a hole 36 in the center through which the ball screw 19 (see FIG. 3) passes.
  • the die opening/closing servomotor 22 is in contact with the stationary platen 13 through a heat insulating material 35, and is attached by bolts 39, 39, .
  • the temperature rise of the mold opening/closing servomotor 22 is suppressed in the mold clamping device 2 according to the present embodiment, it is possible to prevent the output torque from decreasing due to the decrease in the magnetic force. Furthermore, since the electric parts provided in the mold opening/closing servomotor 22 are not exposed to high temperatures, it is possible to suppress the shortening of the service life.
  • FIG. 5 shows a servomotor mounting location 41 to which a mold opening/closing servomotor is mounted, which is a part of the fixed platen 13A according to the second embodiment.
  • the die opening/closing servomotor 22 (see FIG. 3) is attached to the stationary platen 13 so as to be in direct contact with these protrusions 43, 43, .
  • the mold opening/closing servomotor 22 (see FIG. 3) is provided at the servomotor mounting location 41 shown in FIG. A layer of air is formed in the This layer of air serves as a heat insulating means, and the temperature rise of the mold opening/closing servomotor 22 is suppressed.
  • the projections 43, 43, . . . may be provided on the stationary platen 13 as separate parts.
  • the first mold platen (fixed platen) is provided with a protrusion at the position where the mold opening/closing servomotor is attached, and an air layer is formed between the mold opening/closing servomotor and the mold opening/closing servomotor to provide heat insulation. It is also one of preferred modes that the means is the air layer.

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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

The present invention is directed to a mold-clamping device comprising: first and second platens (13, 14); a plurality of ball screw mechanisms (18) that couple the first and second platens together; and a platen-opening/closing servomotor (22). The ball screw mechanisms (18) are each provided with a ball screw (19) and a ball nut (20). The ball screw (19) is rotatably supported by the first platen (13) with a bearing mechanism (26) interposed therebetween, and has an end part that serves as the rotational shaft of the platen-opening/closing servomotor (22). Meanwhile, the ball nut (20) is fixed to the second platen (14). In the present disclosure, the platen-opening/closing servomotor (22) is provided to the first platen (13) with a heat-insulating means (35) interposed therebetween.

Description

型締装置、および射出成形機Mold clamping device and injection molding machine
　本発明は、第１、２の型盤と第１、２の型盤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、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 first and second mold plates and a plurality of sets of ball screw mechanisms connecting the first and second mold plates, 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、第１、２の型盤つまり固定盤と可動盤と、これらを連結する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個の型開閉用サーボモータとから構成されている。４個の型開閉用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 consists of first and second mold plates, that is, a fixed platen and a movable platen, four sets of ball screw mechanisms connecting them, and four mold opening/closing servos provided in each ball screw mechanism. It consists of a motor. When the four die opening/closing servo motors are driven, the four sets of ball screw mechanisms are driven to slide the movable platen relative to the stationary 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。具体的には型開閉用サーボモータの性能低下の問題が見受けられる。金型は射出材料が射出されるので必然的に高温になるが、金型の熱は固定盤に伝導し、固定盤も高温になる。特許文献１に記載の型締装置は型開閉用サーボモータが固定盤に固定されているので、固定盤の熱は型開閉用サーボモータにも伝導する。つまり型開閉用サーボモータも高温になる。そうすると永久磁石に影響を及ぼして、出力トルクが低下させる問題がある。 The mold clamping device described in Patent Document 1 has two mold plates, 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 of deterioration in the performance of the mold opening/closing servomotor. The mold inevitably becomes hot because the injection material is injected, but the heat of the mold is transferred to the stationary platen, which also becomes hot. In the mold clamping device disclosed in Patent Document 1, the mold opening/closing servomotor is fixed to the stationary platen, so the heat of the stationary platen is also conducted to the mold opening/closing servomotor. In other words, the mold opening/closing servomotor also becomes hot. Then, there is a problem that the permanent magnet is affected and the output torque is lowered.
　以上のような問題を鑑み、本開示において、型開閉用サーボモータの性能の低下を防止する型締装置、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 that prevent deterioration in the performance of a mold opening/closing servomotor.
　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、第１、２の型盤と、これらを連結する複数組のボールねじ機構と、型開閉用サーボモータと、を備えた型締装置を対象とする。ボールねじ機構は、ボールねじとボールナットとを備えており、ボールねじは、軸受機構を介して第１の型盤に回転可能に支持されていると共に、その端部が型開閉用サーボモータの回転軸になっている。一方、ボールナットは第２の型盤に固定されている。本発明者らは、型開閉用サーボモータを、第１の型盤に対して断熱手段を介して設け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 first and second mold plates, a plurality of sets of ball screw mechanisms that connect them, and a mold opening/closing servomotor. The ball screw mechanism includes a ball screw and a ball nut. The ball screw is rotatably supported by the first mold platen via a bearing mechanism, and the end of the ball screw is connected to the mold opening/closing servomotor. It is the axis of rotation. On the other hand, the ball nut is fixed to the second mold platen. The present inventors have found that the above problem can be solved by providing the mold opening/closing servomotor to the first mold plate via heat insulating means.
　型開閉用サーボモータの性能の低下を防止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。 It is possible to provide a mold clamping device and an injection molding machine that can prevent deterioration of the performance of the mold opening/closing servomotor.
図１は、本実施の形態に係る射出成形機を示す正面図である。FIG. 1 is a front view showing an injection molding machine according to this embodiment. 図２は、本実施の形態に係る型締装置を示す斜視図である。FIG. 2 is a perspective view showing the mold clamping device according to this embodiment. 図３は、本実施の形態に係る型締装置の一部を示す正面断面図である。FIG. 3 is a front cross-sectional view showing part of the mold clamping device according to this embodiment. 図４は、本実施の形態に係る断熱材を示す斜視図である。FIG. 4 is a perspective view showing a heat insulating material according to this embodiment. 図５は、本実施の第２の形態に係る固定盤の一部であって、型開閉用サーボモータが取り付けられるサーボモータ取り付け箇所を示す斜視図である。FIG. 5 is a perspective view showing a part of the stationary platen according to the second embodiment, and showing a servomotor mounting location where a mold opening/closing servomotor is mounted.
　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、
　第１、第２の型盤と、
　前記第１、第２の型盤を連結する複数組のボールねじ機構と、
　前記ボールねじ機構を駆動する型開閉用サーボモータと、を備え、
　前記ボールねじ機構は、ボールねじと、
　該ボールねじに螺合しているボールナットと、を備え、
　前記ボールねじは、軸受機構を介して前記第１の型盤に回転可能に支持されていると共に、その端部が前記型開閉用サーボモータの回転軸になっており、
　前記ボールナットは前記第２の型盤に固定されており、
　前記型開閉用サーボモータは、前記第１の型盤に対して断熱手段を介して設けられている。 The mold clamping device according to this embodiment is
first and second mold plates;
a plurality of sets of ball screw mechanisms that connect the first and second mold plates;
a mold opening/closing servomotor that drives the ball screw mechanism;
The ball screw mechanism includes a ball screw,
a ball nut screwed onto the ball screw;
The ball screw is rotatably supported by the first mold plate via a bearing mechanism, and an end of the ball screw serves as a rotation shaft of the mold opening/closing servomotor,
The ball nut is fixed to the second mold platen,
The mold opening/closing servomotor is provided via a heat insulating means with respect to the first mold 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、第１、第２の型盤と、
　前記第１、第２の型盤を連結する複数組のボールねじ機構と、
　前記ボールねじ機構を駆動する型開閉用サーボモータと、を備え、
　前記ボールねじ機構は、ボールねじと、
　該ボールねじに螺合しているボールナットと、を備え、
　前記ボールねじは、軸受機構を介して前記第１の型盤に回転可能に支持されていると共に、その端部が前記型開閉用サーボモータの回転軸になっており、
　前記ボールナットは前記第２の型盤に固定されており、
　前記型開閉用サーボモータは、前記第１の型盤に対して断熱手段を介して設けられている。 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 first and second mold plates,
a plurality of sets of ball screw mechanisms that connect the first and second mold plates;
a mold opening/closing servomotor that drives the ball screw mechanism;
The ball screw mechanism includes a ball screw,
a ball nut screwed onto the ball screw;
The ball screw is rotatably supported by the first mold plate via a bearing mechanism, and an end of the ball screw serves as a rotation shaft of the mold opening/closing servomotor,
The ball nut is fixed to the second mold platen,
The mold opening/closing servomotor is provided via a heat insulating means with respect to the first mold 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＞
　最初に射出装置４を説明する。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>
First, the injection device 4 will be described. 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。図１に示されているように、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 . As shown in FIG. 1, a stationary mold 16 is attached to the stationary platen 13, and a movable 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組からなることが好ましい。
　本実施の形態に係る型締装置２は、図２に示されているように、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 the present embodiment, it is preferable that the ball screw mechanisms connecting the fixed platen and the movable platen consist of four sets.
In the mold clamping device 2 according to this embodiment, as shown in FIG. 2, 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、次に詳しく説明するように固定盤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には型開閉用サーボモータ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、型開閉用サーボモータ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 stationary platen 13 is provided with mold opening/ closing servomotors 22, 22, . . . which are connected to ball screws 19, 19, . Therefore, when the mold opening/ closing servomotors 22, 22, . . . are driven, the ball screws 19, 19, . That is, the molds 16 and 17 (see FIG. 1) are opened and closed.
　ボールねじ１９、１９、…と、固定盤１３との接続について説明する。図３に示されているように、固定盤１３には貫通孔２４が開けられており、ボールねじ１９はこの貫通孔２４に入れられている。ボールねじ１９には、外径が小さくなっている段部２５が形成されており、この段部２５に軸受機構２６が入れられている。段部２５には、一部の範囲に雄ねじが形成されており、ロックナット２８が螺合している。固定盤１３には環状の軸受押さえ２９が固定されており、軸受機構２６は固定盤１３側の軸受押さえ２９と、ボールねじ１９側のロックナット２８とによって挟み込まれている。このようにしてボールねじ１９は、軸受機構２６を介して固定盤１３に回転可能に取り付けられている。 The connection between the ball screws 19, 19, . . . and the stationary platen 13 will be explained. As shown in FIG. 3, the stationary platen 13 has a through hole 24, and the ball screw 19 is inserted into the through hole 24. As shown in FIG. The ball screw 19 is formed with a stepped portion 25 having a smaller outer diameter, and a bearing mechanism 26 is inserted in the stepped portion 25 . A male thread is formed in a part of the stepped portion 25, and a lock nut 28 is screwed thereon. An annular bearing retainer 29 is fixed to the stationary platen 13 , and the bearing mechanism 26 is sandwiched between the bearing retainer 29 on the stationary platen 13 side and the lock nut 28 on the ball screw 19 side. In this manner, the ball screw 19 is rotatably attached to the stationary platen 13 via the bearing mechanism 26 .
　このようにボールねじ１９と固定盤１３とが接続されているので、ボールねじ１９と固定盤１３との間に作用するスラスト方向の荷重は、軸受押さえ２９と、軸受機構２６とロックナット２８とによって受けられることになる。したがって、ボールねじ１９の端部には、スラスト方向の荷重は作用しない。型開閉用サーボモータ２２はステータ３０とロータ３１とからなるが、このボールねじ１９の端部にロータ３１が固定されている。つまり型開閉用サーボモータ２２には、スラスト方向の荷重が作用しないようになっている。 Since the ball screw 19 and the stationary platen 13 are connected in this manner, the load in the thrust direction acting between the ball screw 19 and the stationary platen 13 is reduced by the bearing retainer 29, the bearing mechanism 26, and the locknut 28. will be received by Therefore, no load acts on the end of the ball screw 19 in the thrust direction. The die opening/closing servomotor 22 comprises a stator 30 and a rotor 31 , and the rotor 31 is fixed to the end of the ball screw 19 . In other words, the load in the thrust direction is not applied to the mold opening/closing servomotor 22 .
＜断熱材＞
　本実施の形態に係る型締装置２は、固定盤１３に対して型開閉用サーボモータ２２が断熱手段を介して設けられている点に特徴がある。本実施の形態において断熱手段は断熱材３５からなる。断熱材３５は断熱作用を備えていると共に耐熱性を備えていればどのような素材から構成してもよい。例えばシリカウール、セラミックファイバー、グラスウール等から構成することができる。図４には、本実施の形態に係る断熱材３５が示されている。断熱材３５は円盤状に形成され、中心にはボールねじ１９（図３参照）が貫通する孔３６が開けられている。そして断熱材３５の円盤の外周近傍にはボルトを貫通させるためのボルト孔３７、３７、…が開けられている。型開閉用サーボモータ２２は、図３に示されているように、断熱材３５を介して固定盤１３に接触するようになっており、ボルト３９、３９、…によって取り付けられている。 <Insulation material>
The mold clamping device 2 according to the present embodiment is characterized in that the mold opening/closing servomotor 22 is provided to the stationary platen 13 via heat insulating means. In this embodiment, the heat insulating means is made of heat insulating material 35 . The heat insulating material 35 may be made of any material as long as it has a heat insulating effect and heat resistance. For example, it can be composed of silica wool, ceramic fiber, glass wool, or the like. FIG. 4 shows the heat insulating material 35 according to this embodiment. The heat insulating material 35 is formed in a disc shape and has a hole 36 in the center through which the ball screw 19 (see FIG. 3) passes. Bolt holes 37, 37, . As shown in FIG. 3, the die opening/closing servomotor 22 is in contact with the stationary platen 13 through a heat insulating material 35, and is attached by bolts 39, 39, .
＜型締装置の作用＞
　本実施の形態に係る型締装置２は、型開閉用サーボモータ２２が断熱材３５を介して固定盤１３に設けられているので、固定盤１３の熱が型開閉用サーボモータ２２に伝導しにくい。したがってサーボモータ２２の温度上昇を抑制することができる。型開閉用サーボモータ２２には永久磁石が設けられ、永久磁石はいわゆる熱減磁により高温になると磁力が低下する。しかしながら、本実施の形態に係る型締装置２は型開閉用サーボモータ２２の温度上昇が抑制されているので、磁力低下に伴う出力トルクの低下を防止することができる。さらには型開閉用サーボモータ２２内に設けられている電気部品についても高温にさらされることがないので、寿命低下を抑制することができる。 <Action of mold clamping device>
In the mold clamping device 2 according to the present embodiment, since the mold opening/closing servomotor 22 is provided on the stationary platen 13 via the heat insulating material 35, the heat of the stationary platen 13 is conducted to the mold opening/closing servomotor 22. Hateful. Therefore, the temperature rise of the servomotor 22 can be suppressed. A permanent magnet is provided in the mold opening/closing servomotor 22, and the magnetic force of the permanent magnet decreases when the temperature rises due to so-called thermal demagnetization. However, since the temperature rise of the mold opening/closing servomotor 22 is suppressed in the mold clamping device 2 according to the present embodiment, it is possible to prevent the output torque from decreasing due to the decrease in the magnetic force. Furthermore, since the electric parts provided in the mold opening/closing servomotor 22 are not exposed to high temperatures, it is possible to suppress the shortening of the service life.
＜第２の実施の形態に係る型締装置＞
　本実施の形態は色々な変形が可能である。例えば断熱手段を変形することができる。図５には第２の実施の形態に係る固定盤１３Ａの一部である、型開閉用サーボモータが取り付けられるサーボモータ取り付け箇所４１が示されている。サーボモータ取り付け箇所４１には所定の肉厚の複数の突起部４３、４３、…が形成されている。これらの突起部４３、４３、…は全体として環状に配置され、頂部にはボルト孔４５、４５、…が形成されている。 <Mold clamping device according to the second embodiment>
Various modifications are possible for this embodiment. For example, the insulation means can be modified. FIG. 5 shows a servomotor mounting location 41 to which a mold opening/closing servomotor is mounted, which is a part of the fixed platen 13A according to the second embodiment. A plurality of protrusions 43, 43, . These protrusions 43, 43, . . . are arranged in a ring as a whole, and bolt holes 45, 45, .
　型開閉用サーボモータ２２（図３参照）はこれらの突起部４３、４３、…に直接接するようにして固定盤１３に取り付けられるようになっている。型開閉用サーボモータ２２（図３参照）が図５に示されているサーボモータ取り付け箇所４１に設けられると、突起部４３、４３、…によって型開閉用サーボモータ２２と固定盤１３との間に空気の層が形成される。この空気の層が断熱手段になり、型開閉用サーボモータ２２の温度上昇が抑制される。さらに突起部４３、４３、…が複数からなり分離しているので、空気の層は外部と交換されて温度上昇が抑制される効果もある。なお、突起部４３、４３、…は別部品として固定盤１３に設けられてもよい。
　このように、第１の型盤（固定盤）の、型開閉用サーボモータの取り付け箇所には突起部が設けられて前記型開閉用サーボモータとの間に空気層が形成されており、断熱手段は前記空気層であることも好ましい態様の１つである。 The die opening/closing servomotor 22 (see FIG. 3) is attached to the stationary platen 13 so as to be in direct contact with these protrusions 43, 43, . When the mold opening/closing servomotor 22 (see FIG. 3) is provided at the servomotor mounting location 41 shown in FIG. A layer of air is formed in the This layer of air serves as a heat insulating means, and the temperature rise of the mold opening/closing servomotor 22 is suppressed. Furthermore, since the projections 43, 43, . . . may be provided on the stationary platen 13 as separate parts.
In this way, the first mold platen (fixed platen) is provided with a protrusion at the position where the mold opening/closing servomotor is attached, and an air layer is formed between the mold opening/closing servomotor and the mold opening/closing servomotor to provide heat insulation. It is also one of preferred modes that the means is the air layer.
＜他の変形例＞
　本実施の形態において、第１、２の型盤つまり固定盤１３と可動盤１４とを連結しているボールねじ機構１８、１８、…は４組であると説明した。しかしながら、２組あるいは３組であってもよいし、５組以上であってもよい。 <Other Modifications>
In the present embodiment, four sets of ball screw mechanisms 18, 18, . However, it may be two sets, three sets, or five sets or more.
　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、型開閉用サーボモータの性能の低下を防止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 prevent deterioration in the performance of a mold opening/closing servomotor.
　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２０２１－１９０７７７）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. 2021-190777) 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　　型開閉用サーボモータ　　　２４　　貫通孔
　２５　　段部　　　　　　　　　　　２６　　軸受機構
　２８　　ロックナット　　　　　　　２９　　軸受押さえ
　３０　　ステータ　　　　　　　　　３１　　ロータ
　３５　　断熱材　　　　　　　　　　３６　　孔
　３７　　ボルト孔　　　　　　　　　３９　　ボルト
　４１　　サーボモータ取り付け箇所　４３　　突起部
　４５　　ボルト孔　　　　　　　　１３Ａ　　固定盤
　　Ｂ　　ベッド  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 Mold opening/closing servomotor 24 Through hole 25 Step 26 Bearing mechanism 28 Lock nut 29 Bearing retainer 30 Stator 31 Rotor 35 Heat insulating material 36 Hole 37 Bolt hole 39 Bolt 41 Servo motor mounting location 43 Projection 45 Bolt hole 13A Fixed plate B Bed

Claims (8)

  1. 　第１、第２の型盤と、
    　前記第１、第２の型盤を連結する複数組のボールねじ機構と、
    　前記ボールねじ機構を駆動する型開閉用サーボモータと、を備え、
    　前記ボールねじ機構は、ボールねじと、
    　該ボールねじに螺合しているボールナットと、を備え、
    　前記ボールねじは、軸受機構を介して前記第１の型盤に回転可能に支持されていると共に、その端部が前記型開閉用サーボモータの回転軸になっており、
    　前記ボールナットは前記第２の型盤に固定されており、
    　前記型開閉用サーボモータは、前記第１の型盤に対して断熱手段を介して設けられている、型締装置。     first and second mold plates;
    a plurality of sets of ball screw mechanisms that connect the first and second mold plates;
    a mold opening/closing servomotor that drives the ball screw mechanism;
    The ball screw mechanism includes a ball screw,
    a ball nut screwed onto the ball screw;
    The ball screw is rotatably supported by the first mold plate via a bearing mechanism, and an end of the ball screw serves as a rotation shaft of the mold opening/closing servomotor,
    The ball nut is fixed to the second mold platen,
    A mold clamping device, wherein the mold opening/closing servomotor is provided to the first mold plate via a heat insulating means.
  2. 　前記ボールねじ機構は４組からなる、請求項１に記載の型締装置。 The mold clamping device according to claim 1, wherein the ball screw mechanism consists of four sets.
  3. 　前記断熱手段は断熱材からなる、請求項１または２に記載の型締装置。 The mold clamping device according to claim 1 or 2, wherein the heat insulating means is made of a heat insulating material.
  4. 　前記第１の型盤の、前記型開閉用サーボモータの取り付け箇所には突起部が設けられて前記型開閉用サーボモータとの間に空気層が形成されており、前記断熱手段は前記空気層である、請求項１または２に記載の型締装置。 A projecting portion is provided at a portion of the first mold plate where the mold opening/closing servomotor is attached, and an air layer is formed between the mold opening/closing servomotor and the heat insulating means. The mold clamping device according to claim 1 or 2, wherein
  5. 　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、第１、第２の型盤と、
    　前記第１、第２の型盤を連結する複数組のボールねじ機構と、
    　前記ボールねじ機構を駆動する型開閉用サーボモータと、を備え、
    　前記ボールねじ機構は、ボールねじと、
    　該ボールねじに螺合しているボールナットと、を備え、
    　前記ボールねじは、軸受機構を介して前記第１の型盤に回転可能に支持されていると共に、その端部が前記型開閉用サーボモータの回転軸になっており、
    　前記ボールナットは前記第２の型盤に固定されており、
    　前記型開閉用サーボモータは、前記第１の型盤に対して断熱手段を介して設けられている、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 first and second mold plates,
    a plurality of sets of ball screw mechanisms that connect the first and second mold plates;
    a mold opening/closing servomotor that drives the ball screw mechanism;
    The ball screw mechanism includes a ball screw,
    a ball nut screwed onto the ball screw;
    The ball screw is rotatably supported by the first mold plate via a bearing mechanism, and an end of the ball screw serves as a rotation shaft of the mold opening/closing servomotor,
    The ball nut is fixed to the second mold platen,
    The injection molding machine according to claim 1, wherein the mold opening/closing servomotor is provided to the first mold plate via heat insulating means.
  6. 　前記ボールねじ機構は４組からなる、請求項５に記載の射出成形機。 The injection molding machine according to claim 5, wherein the ball screw mechanism consists of four sets.
  7. 　前記断熱手段は断熱材からなる、請求項５または６に記載の射出成形機。 The injection molding machine according to claim 5 or 6, wherein said heat insulating means is made of a heat insulating material.
  8. 　前記第１の型盤の、前記型開閉用サーボモータの取り付け箇所には突起部が設けられて前記型開閉用サーボモータとの間に空気層が形成されており、前記断熱手段は前記空気層である、請求項５または６に記載の射出成形機。 A projecting portion is provided at a portion of the first mold plate where the mold opening/closing servomotor is attached, and an air layer is formed between the mold opening/closing servomotor and the heat insulating means. The injection molding machine according to claim 5 or 6, wherein
PCT/JP2022/042153 2021-11-25 2022-11-11 Mold-clamping device, and injection-molding machine WO2023095651A1 (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05269748A (en) * 1992-03-25 1993-10-19 Okuma Mach Works Ltd Clamping device
JPH10667A (en) * 1996-06-13 1998-01-06 Fanuc Ltd Injection molding machine
JP2003033954A (en) * 2001-07-25 2003-02-04 Toyo Mach & Metal Co Ltd Injection molding machine
JP2007136518A (en) * 2005-11-21 2007-06-07 Toyo Mach & Metal Co Ltd Die casting machine

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05269748A (en) * 1992-03-25 1993-10-19 Okuma Mach Works Ltd Clamping device
JPH10667A (en) * 1996-06-13 1998-01-06 Fanuc Ltd Injection molding machine
JP2003033954A (en) * 2001-07-25 2003-02-04 Toyo Mach & Metal Co Ltd Injection molding machine
JP2007136518A (en) * 2005-11-21 2007-06-07 Toyo Mach & Metal Co Ltd Die casting machine

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