WO2010038567A1 - Injection nozzle and injection molding machine - Google Patents

Injection nozzle and injection molding machine Download PDF

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Publication number
WO2010038567A1
WO2010038567A1 PCT/JP2009/065060 JP2009065060W WO2010038567A1 WO 2010038567 A1 WO2010038567 A1 WO 2010038567A1 JP 2009065060 W JP2009065060 W JP 2009065060W WO 2010038567 A1 WO2010038567 A1 WO 2010038567A1
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WIPO (PCT)
Prior art keywords
cylinder
injection nozzle
tip
injection
screw
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PCT/JP2009/065060
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French (fr)
Japanese (ja)
Inventor
徹 富波
篤 内藤
一啓 和田
雄一 藤井
基 森
Original Assignee
コニカミノルタオプト株式会社
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Application filed by コニカミノルタオプト株式会社 filed Critical コニカミノルタオプト株式会社
Publication of WO2010038567A1 publication Critical patent/WO2010038567A1/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
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/20—Injection nozzles

Definitions

  • the present invention relates to an injection nozzle for injection molding various resin products such as optical elements and an injection molding machine incorporating the same, and more particularly to an injection nozzle and an injection molding machine suitable for molding using an energy curable resin.
  • an O-ring may be disposed between the end face on the base side of the injection nozzle portion and the seat surface on the back side of the female screw of the cylinder to improve the sealing performance.
  • a seal deteriorates and easily leaks into the gap between the screws.
  • an object of the present invention is to provide an injection nozzle that can be easily maintained and replaced even when injection molding of a low-viscosity resin material is performed.
  • Another object of the present invention is to provide an injection molding machine that incorporates the injection nozzle as described above and has excellent maintainability.
  • An injection nozzle according to the present invention is an injection nozzle for injecting a resin material in a cylinder into a mold in a state that the tip is abutted against an opening of the mold, and is provided at the tip of the cylinder.
  • a screw-fastening fixing portion for fixing the nozzle body to the tip of the cylinder is provided at a position along the flow path through which the nozzle body moves from the inner surface side of the cylinder.
  • the screw tightening fixing portion is provided at a position away from the inner surface side of the cylinder along the flow path through which the resin material flows, so that the nozzle is tightened by the screw tightening mechanism constituting the screw tightening fixing portion. While ensuring easy attachment / detachment of the main body, it is possible to prevent the liquid resin material in the cylinder from leaking into the screw structure portion of the fixed portion and hardening. As a result, it is possible to prevent the nozzle body from becoming difficult to be separated, that is, it is possible to prevent the nozzle body and the cylinder from being disassembled and cleaned and the nozzle body from being replaced.
  • the nozzle body is formed around an insertion portion that is inserted into a fitting hole provided at a distal end portion of the cylinder and a portion closer to the distal end side than the insertion portion. And a flange portion having an opening disposed at a position corresponding to the screw hole disposed at the tip end portion of the cylinder and being screwed into the screw hole through the opening. It is fixed to the tip of the cylinder by a screw member to be joined. In this case, the nozzle body can be reliably fixed to the tip of the cylinder via the flange portion.
  • a ring-shaped seal member is disposed between the fixed portion and the flow path.
  • the seal member as a barrier, and to prevent the liquid resin material from reaching the fixed portion with a certain degree of certainty.
  • the seal member is an elastic body that is sandwiched between the tip of the cylinder and the nozzle body.
  • a reliable elastic seal can be achieved by a simple elastic body, and leakage of the liquid resin material can be easily and reliably prevented.
  • the nozzle main body is formed around an insertion portion that is inserted into a fitting hole provided in the tip portion of the cylinder, and a portion of the nozzle body that is closer to the tip side than the insertion portion. And a threaded portion that is screwed to the tip of the cylinder.
  • the nozzle body can be stably fixed to the tip portion of the cylinder with sufficient strength via the flange portion.
  • the ring-shaped seal member is disposed between the outer edge at the tip of the fitting hole and the inner edge on the back surface of the flange portion.
  • the sealing member can reliably prevent the liquid resin material from leaking from the insertion portion to the flange portion side.
  • the seal member is held by the seat portion which is a depression provided in the outer edge.
  • the holding of the seal member can be stabilized, the workability of attaching / detaching the nozzle body can be improved, and the reliability of the seal can be improved.
  • the resin material guided to the nozzle body through the cylinder is an energy curable resin.
  • the energy curable resin refers to a resin that is cured by receiving energy, and refers to a “thermosetting resin” that is cured by thermal energy, an “ultraviolet curable resin” that is cured by ultraviolet energy, and the like.
  • the viscosity of the energy curable resin is generally extremely low, as described above, it is possible to prevent the nozzle body from becoming difficult to be separated due to the liquid energy curable resin flowing into the screw structure portion of the fixing portion and being cured. .
  • An injection molding machine includes the above-described injection nozzle, and is characterized in that the resin is molded by injecting a resin material into the mold from the injection nozzle.
  • the above injection molding machine incorporates an injection nozzle that can be easily attached and detached by a screw tightening mechanism and that can reliably prevent the nozzle body from becoming difficult to be separated by the leaked liquid resin material. Yes. Therefore, it is possible to provide an injection molding machine that is suitable for injection molding of various resin materials and that operates with high accuracy over a long period of time and is easy to maintain.
  • FIG. 1 is a front view for explaining the injection molding machine of the present embodiment
  • FIG. 2 is a perspective view of the injection molding machine of FIG.
  • the injection molding machine 10 includes a molding die 40 including a fixed die 41 as a first die and a movable die 42 as a second die, and injection into the molding die 40 is performed.
  • a molding die 40 including a fixed die 41 as a first die and a movable die 42 as a second die, and injection into the molding die 40 is performed.
  • injection molding in which the resin material from the apparatus 16 is injected and cured, a molded article that is, for example, a lens array or other optical element is produced.
  • the injection molding machine 10 includes a fixed platen 11, a movable platen 12, a mold clamping plate 13, an opening / closing drive device 15, and an injection device 16.
  • the injection molding machine 10 sandwiches a fixed mold 41 and a movable mold 42 between the movable platen 12 and the fixed platen 11 and clamps both the molds 41, 42, whereby an injection molding cavity ( (Not shown).
  • This cavity is a mold space for injecting a resin material, and corresponds to the outer shape of the molded product.
  • the fixed platen 11 is fixed to the upper surface on the center side of the support frame 14, and the inside of the fixed platen 11 detachably supports the fixed mold 41.
  • the movable platen 12 is supported by an opening / closing drive device 15 to be described later so as to be capable of moving forward and backward.
  • Inside the movable platen 12, a movable mold 42 is detachably supported.
  • the mold clamping machine 13 is fixed to the upper surface on the end side of the support frame 14.
  • a plurality of tie bars 19 a are installed between the fixed platen 11 and the mold clamping platen 13.
  • the opening / closing drive device 15 includes a linear guide 15a, a power transmission unit 15d, and an actuator 15e.
  • the linear guide 15 a supports the movable platen 12 and enables the movable platen 12 to smoothly reciprocate with respect to the advancing and retreating direction with respect to the fixed platen 11.
  • the power transmission unit 15d expands and contracts in response to the driving force from the actuator 15e.
  • the movable platen 12 can be freely displaced toward and away from the mold clamping plate 13, and as a result, the movable platen 12 and the fixed platen 11 can be closed so as to be close to each other. Both molds 41 and 42 can be clamped with a desired clamping force.
  • the injection device 16 includes a cylinder 16a, a screw 16c, an injection nozzle 16d, and a drive unit 16e.
  • the injection device 16 can inject liquid or fluid resin from an injection nozzle 16d provided at the tip of the cylinder 16a. Further, the injection device 16 can detachably connect the injection nozzle 16d to the sprue portion SP (see FIG. 4) of the fixed mold 41 through the opening 11a provided in the center of the fixed platen 11. Thereby, the liquid resin in the cylinder 16a can be supplied at a desired timing into a cavity formed with the fixed mold 41 and the movable mold 42 being clamped.
  • the drive part 16e has the rotational drive mechanism which rotates the screw 16c, and the linear motion drive mechanism which advances / retreats the screw 16c to an axial direction.
  • the liquid resin in the cylinder 16a can be stirred (heated if necessary), and by moving the screw 16c forward, the liquid resin in the cylinder 16a is injected into the injection nozzle 16d. From the desired pressure and flow rate.
  • the cylinder 16a is connected to a raw material reservoir (not shown), and receives supply of resin from the raw material reservoir at an appropriate timing and amount.
  • the movable mold 42 and the fixed mold 41 are heated to a temperature suitable for molding.
  • the opening / closing drive device 15 is operated, the movable mold 42 is advanced to the fixed mold 41 side, the mold is closed, and further, the mold clamping is performed to clamp the movable mold 42 and the fixed mold 41 with a necessary pressure. I do.
  • the injection device 16 is operated, and the resin injected from the injection nozzle 16d of the injection device 16 is sprung into the cavity formed between the clamped movable die 42 and the fixed die 41. Inject through SP or the like. The resin injected and filled into the cavity is heated to an appropriate temperature and solidified.
  • thermosetting resin which is an energy curable resin
  • a thermosetting resin which is an energy curable resin
  • silicone resins, allyl esters, acrylic resins, epoxy resins, polyimides, urethane resins, and the like are used as thermosetting resins.
  • the opening / closing drive device 15 is operated to retract the movable mold 42 and perform mold opening to separate the movable mold 42 from the fixed mold 41.
  • the molded product is released from the fixed mold 41 while being held by the movable mold 42, for example.
  • the molded product remaining in the movable mold 42 is pushed out by, for example, an ejector (not shown) and released from the movable mold 42.
  • the molded product released from both molds 41 and 42 is carried out of the injection molding machine 10.
  • FIG. 3 is a partial cross-sectional view illustrating the structure of the injection nozzle 16d.
  • the injection nozzle 16d includes a nozzle main body 31, a cylinder tip 32, a fastening screw 33, and a seal member 34.
  • the nozzle body 31 is a cylindrical metal member, has a passage 31a extending along the central axis AX inside, and has a tapered connecting portion 31b at the tip. An opening OP extending from the passage 31a is formed in the connection portion 31b. Further, the nozzle body 31 has an insertion portion 31c on the base side thereof, which is inserted into a fitting hole 32b provided in the cylinder tip portion 32 and fitted therewith. Further, the nozzle body 31 has a flange portion 31d that comes into contact with the distal end surface 32c of the cylinder distal end portion 32 around the portion closer to the distal end than the insertion portion 31c. For example, eight openings 31f are formed at equal intervals along the circumference of the flange portion 31d, and a fastening screw 33 for fixing the nozzle body 31 to the cylinder tip portion 32 can be passed therethrough.
  • the cylinder tip 32 is a straight cylindrical metal member that also serves as a part of the cylinder 16a, and includes a resin passage 32a having a circular cross section through which the screw 16c can be advanced and retracted.
  • a fitting hole 32b which is a hole having a diameter larger than that of the resin flow path 32a, is formed at the tip end of the cylinder front end portion 32.
  • the fitting hole 32b is coaxial with the resin flow path 32a along the axis AX. It extends to.
  • the insertion portion 31c of the nozzle body 31 is detachably fitted into the fitting hole 32b.
  • a front end surface 32c of the cylinder front end portion 32 is machined perpendicular to the axis AX and has eight screw holes 32e. Each of these screw holes 32e corresponds to the opening 31f of the flange portion 31d, and is formed at regular intervals along the circumference, for example.
  • a seat portion 32f that is an annular recess is formed at the outer edge on the front end side of the fitting hole 32b, that is, the inner edge of the front end surface 32c.
  • the seat portion 32f holds the seal member 34 from the periphery, and exposes the seal member 34 to the inside and the front end side of the fitting hole 32b.
  • the fastening screw 33 is made of a metal material and is screwed into a screw hole 32e provided in the tip surface 32c of the cylinder tip 32.
  • the nozzle body 31 is attached in advance to the tip of the cylinder tip 32 and the flange 31d of the nozzle body 31 is fastened to the cylinder tip 32 by the fastening screw 33, the nozzle body 31 is securely attached to the cylinder tip 32. Can be fixed.
  • the back surface 31g of the flange portion 31d is in close contact with the tip surface 32c of the cylinder tip portion 32, the liquid-tightness between the nozzle body 31 and the cylinder tip portion 32 is maintained, and the energy curable resin is externally exposed from the gap between the two. It is possible to reliably prevent leakage.
  • the fastening screw 33 functions as a screw-type fixing portion in cooperation with the screw hole 32e of the cylinder tip portion 32 and the flange portion 31d of the nozzle body 31.
  • the seal member 34 is an O-ring formed of an elastic body such as silicone rubber, and is held on the seat portion 32f on the inner edge of the tip end of the cylinder 32 as described above. Further, when the nozzle body 31 is fixed to the cylinder tip portion 32, the seal member 34 is sandwiched between the seat portion 32f and the inner edge 31h of the flange portion 31d so that the energy curable resin leaks to the outside. It is preventing. Note that when the nozzle body 31 is fixed to the cylinder tip portion 32, the seal member 34 need not be provided if the back surface 31h of the flange portion 31d and the tip surface 32c of the cylinder tip portion 32 are secured.
  • the amount of the energy curable resin leaking to the inner edge 31h and the back surface 31g of the flange portion 31d can be reduced by the seal member 34.
  • the sealing member 34 seals a slight gap between the fitting hole 32b and the insertion portion 31c, leakage of the energy curable resin can be prevented with a sufficient margin.
  • nozzle body 31 replacement of the nozzle body 31 will be described.
  • all the fastening screws 33 are loosened, and the fixing of the flange portion 31d of the nozzle body 31 is released.
  • the nozzle body 31 is sandwiched by a suitable jig and pulled out from the cylinder tip 32.
  • the seal member 34 can be replaced, but can be reused if it is not deteriorated.
  • a new nozzle body 31 is attached to the cylinder tip 32 so that the insertion portion 31c is fitted in the fitting hole 32b.
  • the fastening screws 33 are screwed into all the screw holes 32e and tightened.
  • FIG. 4 is a side view for explaining the operation of the injection nozzle 16d.
  • the injection nozzle 16d abuts against a connection portion 41h formed on the back surface of one fixed mold 41 constituting the molding die 40 and is biased with a necessary pressure.
  • the connection portion 41h is also an opening provided at the entrance of the sprue portion SP, and has a shape such that the tip of the connection portion 31b provided in the injection nozzle 16d is fitted.
  • the fixed mold 41 and the movable mold 42 are joined in advance to be in a mold-clamping state, and both the molds 41 and 42 are cured. Raise the temperature to a suitable temperature.
  • the energy curable resin injected from the injection nozzle 16d is introduced into a cavity communicating with the sprue portion SP through a sprue portion SP which is a mold space formed by clamping the fixed die 41 and the movable die 42.
  • the fixed mold 41 has a body mold 41b fixed on a mold plate 41a, and a core mold 41d for lens surface formation is embedded in a large number of core insertion holes 41c formed at appropriate positions of the body mold 41b. It is fixed in this way.
  • the movable mold 42 has a barrel mold 42b fixed on a mold plate 42a, and a core mold 42d for lens surface formation is embedded in a large number of core insertion holes 42c formed at appropriate positions of the barrel mold 42b. It is fixed in this way.
  • the fixed mold 41 and the movable mold 42 are appropriately heated as already described, and gradually cure the energy curable resin introduced into the sprue portion SP and the cavity. Thereby, it is possible to obtain a lens array in which lenses having shapes corresponding to the optical surface at the tip of the core die 41d and the optical surface at the tip of the core die 42d are arranged.
  • the fastening screw 33 or the flange portion 31d as the fixing portion is provided at a position that is outside the inner side of the cylinder 16a through which the energy curable resin flows. Therefore, the liquid energy curable resin in the cylinder 16a leaks between or near the fastening screw 33 and the screw hole 32e of the fixing portion, while securing the simple attachment / detachment of the nozzle body 31 with the fastening screw 33 or the like. Can be prevented from curing. Thereby, it becomes possible to prevent the separation of the nozzle body 31 from being difficult, that is, it is difficult to disassemble and clean the nozzle body 31 or to replace it.
  • the injection molding machine 10 of the first embodiment incorporates the injection nozzle 16d as described above, is suitable for injection molding of various resin materials, operates with high accuracy over a long period of time, and is easy to maintain. Has characteristics.
  • injection nozzle and the like according to the second embodiment will be described.
  • the injection nozzle according to the second embodiment is a modification of the first embodiment, and parts that are not particularly described are the same as those in the first embodiment.
  • FIG. 5 is a partial cross-sectional view illustrating the structure of the injection nozzle in the present embodiment.
  • the nozzle body 31 of the injection nozzle 116d includes a threaded portion 133 that extends from the outer edge of the flange portion 31d toward the cylinder distal end portion 32 along the axis AX direction.
  • the tip of the cylinder tip 32 is fitted inside the screw part 133.
  • the female screw S1 formed on the inner surface of the screw portion 133 and the male screw S2 formed around the tip of the cylinder tip 32 are screwed together, and the nozzle body 31 is fixed to the cylinder tip 32. .
  • the seal member 34 When the nozzle body 31 is screwed and fixed to the cylinder tip portion 32, the seal member 34 is sandwiched between the seat portion 32f and the inner edge 31h of the flange portion 31d.
  • the seal member 34 prevents the energy curable resin from leaking between the back surface 31 g of the flange portion 31 d and the tip surface 32 c of the cylinder tip portion 32.
  • the flange portion 31d as the fixing portion, the female screw S1, and the male screw S2 are provided at positions away from the inner surface side of the cylinder 16a through which the energy curable resin flows.
  • thermosetting resin used as the energy curable resin
  • an ultraviolet curable resin is injected from the injection nozzle 16d shown in FIG. It can also be done.
  • the ultraviolet curable resin includes, for example, silicone resin, acrylic resin, epoxy resin, polyimide, urethane resin, and the like. If the viscosity of a resin other than the energy curable resin, such as a thermoplastic resin, is low, the thermoplastic resin can be injected from the injection nozzle 16d shown in FIG. It is possible to prevent the resin from leaking around the fixing portion, that is, the fastening screw 33, the screws S1, S2, and the like.
  • a flange portion 31d extending from the nozzle body 31 by the fastening screw 33 is fastened to the tip surface 32c of the cylinder tip portion 32, or a flange portion 31d is fastened to the tip surface of the cylinder tip portion 32 by the screw portion 133
  • screw tightening mechanisms that can fix the nozzle body 31 to the cylinder tip portion 32 can be used, not limited to those tightened to 32c.
  • the seal member 34 is provided between the fitting hole 32b and the insertion portion 31c.
  • another seal can be provided in addition to or instead of this.
  • an annular seal such as an O-ring is disposed between the back surface 31g of the flange portion 31d and the front end surface 32c of the cylinder front end portion 32 to prevent leakage of resin to the fastening screw 33 and the screw portion 133 in a reinforcing manner. can do.
  • an annular marking structure can be provided between the back surface 31g of the flange portion 31d and the front end surface 32c of the cylinder front end portion 32 to prevent resin leakage in a reinforcing manner.
  • seal member 34 is not limited to a resin O-ring such as silicon, but may be a metal O-ring, for example.
  • the fitting hole 32b and the insertion portion 31c are not limited to those having a cylindrical surface, but may have a tapered surface.
  • the fitting hole 32b is a tapered surface that widens at the tip
  • the insertion portion 31c is a tapered surface that narrows at the tip, so that the fitting hole 32b and the tapered surface of the insertion portion 31c are fitted together. And can. In this case, the adhesion between the fitting hole 32b and the insertion portion 31c can be enhanced.
  • the shape of the cavity provided in the injection mold composed of the fixed mold 41 and the movable mold 42 is not limited to the illustrated one, and various shapes can be used. That is, the molded product that is injection-molded by the molding die 40 is not limited to the lens array, and can be various optical components and other resin products.

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

Abstract

An injection nozzle can be easily maintained and replaced even if adapted for injection molding using a resin material having low viscosity. An injection nozzle (16d) is configured such that fastening screws (33) and a flange section (31d) which are fixed sections are provided at positions shifted outward from the inner surface side of a cylinder (16a) in which a resin hardened by energy is made to flow.  The structure prevents the resin, which has a liquid form and is contained in the cylinder (16a), from leaking to the fastening screws (33) and screw holes (32e) in the fixed section.  Because the resin does not leak and harden at the fastening screws (33) and the screw holes (32e), removal of a nozzle body (31) does not become difficult.  As a result, the nozzle body (31) can be easily removed, cleaned, and replaced.

Description

射出ノズル及び射出成形機Injection nozzle and injection molding machine
　本発明は、光学素子等の各種樹脂製品を射出成形するための射出ノズル及びこれを組み込んだ射出成形機に関し、特に、エネルギー硬化性樹脂を用いた成形に適する射出ノズル及び射出成形機に関する。 The present invention relates to an injection nozzle for injection molding various resin products such as optical elements and an injection molding machine incorporating the same, and more particularly to an injection nozzle and an injection molding machine suitable for molding using an energy curable resin.
　射出成形機に組み込まれる射出ノズルとして、メンテナンス時や交換時のために着脱可能にする目的で、シリンダの端部に形成された孔にねじ込んで固定するタイプのものがある（例えば特許文献１参照）。 As an injection nozzle incorporated in an injection molding machine, there is a type that is screwed into a hole formed in an end portion of a cylinder and fixed for the purpose of being removable for maintenance or replacement (for example, see Patent Document 1). ).
特開平９－２４５２５号公報Japanese Patent Laid-Open No. 9-24525
　しかしながら、上記のような射出ノズルを用いて低粘度の樹脂材料を金型内に射出する場合、本来着脱可能に取り付けられている射出ノズル部のメンテナンスや交換が困難になることがあった。すなわち、低粘度の樹脂材料の場合、射出ノズル部の根元の雄ネジとシリンダの端部内面の雌ネジとの間に樹脂が入り込んで接着剤のように固まり、このような樹脂によって射出ノズル部が固定されて取り外せなくなる。特に、射出ノズル部から熱硬化性の樹脂材料を射出する場合、樹脂材料が一般に極めて低粘度となり、一旦硬化した後は加熱しても液状に戻すことができないので、射出ノズル部の取り外しを困難にしていた。 However, when a low-viscosity resin material is injected into a mold using the injection nozzle as described above, it may be difficult to maintain or replace the injection nozzle portion that is originally detachably attached. That is, in the case of a low-viscosity resin material, the resin enters between the male screw at the base of the injection nozzle part and the female screw at the inner surface of the cylinder end and hardens like an adhesive. Is fixed and cannot be removed. In particular, when a thermosetting resin material is injected from an injection nozzle, the resin material generally has a very low viscosity, and once cured, it cannot be returned to a liquid state even when heated, making it difficult to remove the injection nozzle. I was doing.
　なお、例えば射出ノズル部の根元側の端面とシリンダの雌ネジの奥側の座面との間にＯリングを配置してシール性を高めることも考えられる。しかしながら、シリンダ内の流路が極めて高圧になることに起因して、低粘度の熱硬化性樹脂の場合、このようなシールが劣化してネジ間の隙間に漏れ込みやすくなる。 Note that, for example, an O-ring may be disposed between the end face on the base side of the injection nozzle portion and the seat surface on the back side of the female screw of the cylinder to improve the sealing performance. However, in the case of a low-viscosity thermosetting resin due to the extremely high pressure in the flow path in the cylinder, such a seal deteriorates and easily leaks into the gap between the screws.
　そこで、本発明は、低粘度の樹脂材料の射出成形を行う場合であってもメンテナンスや交換が容易な射出ノズルを提供することを目的とする。 Therefore, an object of the present invention is to provide an injection nozzle that can be easily maintained and replaced even when injection molding of a low-viscosity resin material is performed.
　また、本発明は、上記のような射出ノズルを組み込んだメンテナンス性に優れる射出成形機を提供することを目的とする。 Another object of the present invention is to provide an injection molding machine that incorporates the injection nozzle as described above and has excellent maintainability.
　本発明に係る射出ノズルは、シリンダの先端部に設けられ、先端を金型の開口に突き当てた状態でシリンダ内の樹脂材料を金型内に注入するための射出ノズルであって、樹脂材料を流す流路に沿ったシリンダの内面側からはずれる位置に、ノズル本体をシリンダの先端部に固定するネジ締め式の固定部が設けられていることを特徴とする。 An injection nozzle according to the present invention is an injection nozzle for injecting a resin material in a cylinder into a mold in a state that the tip is abutted against an opening of the mold, and is provided at the tip of the cylinder. A screw-fastening fixing portion for fixing the nozzle body to the tip of the cylinder is provided at a position along the flow path through which the nozzle body moves from the inner surface side of the cylinder.
　上記射出ノズルでは、ネジ締め式の固定部が、樹脂材料を流す流路に沿ったシリンダの内面側からはずれる位置に設けられているので、ネジ締め式の固定部を構成するネジ締め機構によってノズル本体の簡易な着脱を確保しつつも、固定部のネジ構造部にシリンダ内の液状の樹脂材料が漏れ込んで硬化することを防止できる。これにより、ノズル本体の分離が困難になること、すなわちノズル本体やシリンダの分解掃除やノズル本体の交換が困難になることを防止できる。 In the above injection nozzle, the screw tightening fixing portion is provided at a position away from the inner surface side of the cylinder along the flow path through which the resin material flows, so that the nozzle is tightened by the screw tightening mechanism constituting the screw tightening fixing portion. While ensuring easy attachment / detachment of the main body, it is possible to prevent the liquid resin material in the cylinder from leaking into the screw structure portion of the fixed portion and hardening. As a result, it is possible to prevent the nozzle body from becoming difficult to be separated, that is, it is possible to prevent the nozzle body and the cylinder from being disassembled and cleaned and the nozzle body from being replaced.
　本発明の具体的な態様によれば、上記ノズル本体は、上記シリンダの先端部に設けた嵌合孔に挿入される挿入部と、上記挿入部よりも先端側の部分の周囲に形成された前記シリンダの先端部に当接するとともに、上記シリンダの先端部に配されたネジ穴に対応する位置に配された開口を有するフランジ部と、を有し、上記開口を介して上記ネジ穴に螺合するネジ部材により上記シリンダの先端部に固定されることを特徴とする。この場合、フランジ部を介して、ノズル本体をシリンダの先端部に確実に固定することができる。 According to a specific aspect of the present invention, the nozzle body is formed around an insertion portion that is inserted into a fitting hole provided at a distal end portion of the cylinder and a portion closer to the distal end side than the insertion portion. And a flange portion having an opening disposed at a position corresponding to the screw hole disposed at the tip end portion of the cylinder and being screwed into the screw hole through the opening. It is fixed to the tip of the cylinder by a screw member to be joined. In this case, the nozzle body can be reliably fixed to the tip of the cylinder via the flange portion.
　本発明の具体的な態様によれば、上記射出ノズルにおいて、固定部と流路との間にリング状のシール部材を配置している。この場合、シール部材が障壁となって液状の樹脂材料がシリンダ外に漏れ出すことを防止でき、固定部に液状の樹脂材料が到達することを一定の確実性で未然に阻止できる。 According to a specific aspect of the present invention, in the injection nozzle, a ring-shaped seal member is disposed between the fixed portion and the flow path. In this case, it is possible to prevent the liquid resin material from leaking out of the cylinder by using the seal member as a barrier, and to prevent the liquid resin material from reaching the fixed portion with a certain degree of certainty.
　本発明の別の態様によれば、シール部材が、シリンダの先端部とノズル本体との間に挟持される弾性体である。この場合、簡易な弾性体によって確実な液密シールが可能になり、液状の樹脂材料が漏れ出すことを簡易・確実に防止できる。 According to another aspect of the present invention, the seal member is an elastic body that is sandwiched between the tip of the cylinder and the nozzle body. In this case, a reliable elastic seal can be achieved by a simple elastic body, and leakage of the liquid resin material can be easily and reliably prevented.
　本発明のさらに別の態様によれば、ノズル本体が、シリンダの先端部に設けた嵌合孔に挿入される挿入部と、ノズル本体のうち挿入部よりも先端側の部分の周囲に形成されるフランジ部とを有し、フランジ部にシリンダの先端部に螺合するネジ部を有する。この場合、フランジ部を介して、ノズル本体をシリンダの先端部に十分な強度で安定して固定することができる。 According to still another aspect of the present invention, the nozzle main body is formed around an insertion portion that is inserted into a fitting hole provided in the tip portion of the cylinder, and a portion of the nozzle body that is closer to the tip side than the insertion portion. And a threaded portion that is screwed to the tip of the cylinder. In this case, the nozzle body can be stably fixed to the tip portion of the cylinder with sufficient strength via the flange portion.
　本発明のさらに別の態様によれば、嵌合孔の先端の外縁とフランジ部の裏面の内縁との間にリング状のシール部材を配置している。この場合、シール部材によって、液状の樹脂材料が挿入部からフランジ部側に漏れ出すことを確実に防止できる。 According to still another aspect of the present invention, the ring-shaped seal member is disposed between the outer edge at the tip of the fitting hole and the inner edge on the back surface of the flange portion. In this case, the sealing member can reliably prevent the liquid resin material from leaking from the insertion portion to the flange portion side.
　本発明のさらに別の態様によれば、シール部材が、外縁に設けた窪みである座部分に保持される。この場合、シール部材の保持が安定し、ノズル本体の着脱の作業性を高めるとともに、シールの確実性を向上させることができる。 According to still another aspect of the present invention, the seal member is held by the seat portion which is a depression provided in the outer edge. In this case, the holding of the seal member can be stabilized, the workability of attaching / detaching the nozzle body can be improved, and the reliability of the seal can be improved.
　本発明のさらに別の態様によれば、シリンダを介してノズル本体に導かれる樹脂材料は、エネルギー硬化性樹脂であることを特徴とする。ここで、エネルギー硬化性樹脂とは、エネルギーを受けることにより硬化する樹脂をいい、熱エネルギーにより硬化する「熱硬化性樹脂」、紫外線エネルギーにより硬化する「紫外線硬化性樹脂」等を指すものである。 エネルギー硬化性樹脂の粘度は一般に極めて低くなるが、上述のように、固定部のネジ構造部に液状のエネルギー硬化性樹脂が流れ込んで硬化することによってノズル本体の分離が困難になることを防止できる。 According to still another aspect of the present invention, the resin material guided to the nozzle body through the cylinder is an energy curable resin. Here, the energy curable resin refers to a resin that is cured by receiving energy, and refers to a “thermosetting resin” that is cured by thermal energy, an “ultraviolet curable resin” that is cured by ultraviolet energy, and the like. . Although the viscosity of the energy curable resin is generally extremely low, as described above, it is possible to prevent the nozzle body from becoming difficult to be separated due to the liquid energy curable resin flowing into the screw structure portion of the fixing portion and being cured. .
　本発明に係る射出成形機は、上述の射出ノズルを備え、射出ノズルから金型内に樹脂材料を射出することによって樹脂の成形を行うことを特徴とする。 An injection molding machine according to the present invention includes the above-described injection nozzle, and is characterized in that the resin is molded by injecting a resin material into the mold from the injection nozzle.
　上記射出成形機では、ネジ締め機構によってノズル本体の簡易な着脱が可能であり、かつ、漏れ出した液状の樹脂材料によってノズル本体の分離が困難になることを確実に防止できる射出ノズルを組み込んでいる。よって、多様な樹脂材料の射出成形に適し長期間にわたって高精度に動作しメンテナンスが簡易な射出成形機を提供することができる。 The above injection molding machine incorporates an injection nozzle that can be easily attached and detached by a screw tightening mechanism and that can reliably prevent the nozzle body from becoming difficult to be separated by the leaked liquid resin material. Yes. Therefore, it is possible to provide an injection molding machine that is suitable for injection molding of various resin materials and that operates with high accuracy over a long period of time and is easy to maintain.
第１実施形態の射出成形機を説明する正面図である。It is a front view explaining the injection molding machine of a 1st embodiment. 第１実施形態の射出成形機を説明する斜視図である。It is a perspective view explaining the injection molding machine of a 1st embodiment. 図１の射出成形機に組み込まれる射出ノズルの構造を説明する部分断面図である。It is a fragmentary sectional view explaining the structure of the injection nozzle integrated in the injection molding machine of FIG. 射出ノズルの動作を説明する側面図である。It is a side view explaining operation | movement of an injection nozzle. 第２の射出成形機に組み込まれる射出ノズルの構造を説明する部分断面図である。It is a fragmentary sectional view explaining the structure of the injection nozzle integrated in a 2nd injection molding machine.
　〔第１実施形態〕
　以下、本発明の第１実施形態である射出ノズル及びこれを組み込んだ射出成形機について、図面を参照しつつ説明する。 [First Embodiment]
Hereinafter, an injection nozzle according to a first embodiment of the present invention and an injection molding machine incorporating the same will be described with reference to the drawings.
　図１は、本実施形態の射出成形機を説明する正面図であり、図２は、図１の射出成形機の斜視図である。この射出成形機１０は、第１金型である固定金型４１と第２金型である可動金型４２とで構成される成形金型４０を備えており、この成形金型４０中に射出装置１６からの樹脂材料を注入して硬化させる射出成形を行うことにより、例えばレンズアレイその他の光学素子である成形品を作製する。 FIG. 1 is a front view for explaining the injection molding machine of the present embodiment, and FIG. 2 is a perspective view of the injection molding machine of FIG. The injection molding machine 10 includes a molding die 40 including a fixed die 41 as a first die and a movable die 42 as a second die, and injection into the molding die 40 is performed. By performing injection molding in which the resin material from the apparatus 16 is injected and cured, a molded article that is, for example, a lens array or other optical element is produced.
　射出成形機１０は、固定盤１１と、可動盤１２と、型締め盤１３と、開閉駆動装置１５と、射出装置１６とを備える。射出成形機１０は、可動盤１２と固定盤１１との間に固定金型４１と可動金型４２とを挟持して両金型４１，４２を型締めすることにより、射出成型用のキャビティ（不図示）を形成する。このキャビティは、樹脂材料を注入するための型空間であり、成形品の外形に対応するものとなっている。 The injection molding machine 10 includes a fixed platen 11, a movable platen 12, a mold clamping plate 13, an opening / closing drive device 15, and an injection device 16. The injection molding machine 10 sandwiches a fixed mold 41 and a movable mold 42 between the movable platen 12 and the fixed platen 11 and clamps both the molds 41, 42, whereby an injection molding cavity ( (Not shown). This cavity is a mold space for injecting a resin material, and corresponds to the outer shape of the molded product.
　固定盤１１は、支持フレーム１４の中央側上面に固定されており、固定盤１１の内側は、固定金型４１を着脱可能に支持している。可動盤１２は、後述する開閉駆動装置１５によって固定盤１１に対して進退移動可能に支持されている。可動盤１２の内側は、可動金型４２を着脱可能に支持している。型締め盤１３は、支持フレーム１４の端部側上面に固定されている。なお、固定盤１１と型締め盤１３との間には、複数のタイバー１９ａが架設されている。 The fixed platen 11 is fixed to the upper surface on the center side of the support frame 14, and the inside of the fixed platen 11 detachably supports the fixed mold 41. The movable platen 12 is supported by an opening / closing drive device 15 to be described later so as to be capable of moving forward and backward. Inside the movable platen 12, a movable mold 42 is detachably supported. The mold clamping machine 13 is fixed to the upper surface on the end side of the support frame 14. A plurality of tie bars 19 a are installed between the fixed platen 11 and the mold clamping platen 13.
　開閉駆動装置１５は、リニアガイド１５ａと、動力伝達部１５ｄと、アクチュエータ１５ｅとを備える。リニアガイド１５ａは、可動盤１２を支持しつつ、固定盤１１に対する進退方向に関して可動盤１２の滑らかな往復移動を可能にしている。動力伝達部１５ｄは、アクチュエータ１５ｅからの駆動力を受けて伸縮する。これにより、型締め盤１３に対して可動盤１２が近接したり離間したりと自在に変位し、結果的に、可動盤１２と固定盤１１とを互いに近接するように型閉じすることができ、所望の型締め力で両金型４１，４２を締め付けることができる。 The opening / closing drive device 15 includes a linear guide 15a, a power transmission unit 15d, and an actuator 15e. The linear guide 15 a supports the movable platen 12 and enables the movable platen 12 to smoothly reciprocate with respect to the advancing and retreating direction with respect to the fixed platen 11. The power transmission unit 15d expands and contracts in response to the driving force from the actuator 15e. As a result, the movable platen 12 can be freely displaced toward and away from the mold clamping plate 13, and as a result, the movable platen 12 and the fixed platen 11 can be closed so as to be close to each other. Both molds 41 and 42 can be clamped with a desired clamping force.
　射出装置１６は、シリンダ１６ａ、スクリュ１６ｃ、射出ノズル１６ｄ、及び駆動部１６ｅを備える。射出装置１６は、シリンダ１６ａの先端に設けた射出ノズル１６ｄから液体状又は流体状の樹脂を射出することができる。また、射出装置１６は、固定盤１１の中央に設けた開口１１ａを介して、射出ノズル１６ｄを固定金型４１のスプル部分ＳＰ（図４参照）に分離可能に接続できる。これにより、シリンダ１６ａ内の液体状の樹脂を、固定金型４１と可動金型４２とを型締めした状態で形成されるキャビティ中に所望のタイミングで供給することができる。なお、図示を省略するが、駆動部１６ｅは、スクリュ１６ｃを回転させる回転駆動機構と、スクリュ１６ｃを軸方向に進退させる直動駆動機構とを有する。スクリュ１６ｃを回転させることで、シリンダ１６ａ内の液体状の樹脂を撹拌（必要に応じて加熱）することができ、スクリュ１６ｃを前進させることで、シリンダ１６ａ内の液体状の樹脂を射出ノズル１６ｄから所望の圧力及び流量で射出させることができる。また、シリンダ１６ａは、不図示の原料貯留部に接続されており、この原料貯留部から適当なタイミング及び量で樹脂の供給を受ける。 The injection device 16 includes a cylinder 16a, a screw 16c, an injection nozzle 16d, and a drive unit 16e. The injection device 16 can inject liquid or fluid resin from an injection nozzle 16d provided at the tip of the cylinder 16a. Further, the injection device 16 can detachably connect the injection nozzle 16d to the sprue portion SP (see FIG. 4) of the fixed mold 41 through the opening 11a provided in the center of the fixed platen 11. Thereby, the liquid resin in the cylinder 16a can be supplied at a desired timing into a cavity formed with the fixed mold 41 and the movable mold 42 being clamped. In addition, although illustration is abbreviate | omitted, the drive part 16e has the rotational drive mechanism which rotates the screw 16c, and the linear motion drive mechanism which advances / retreats the screw 16c to an axial direction. By rotating the screw 16c, the liquid resin in the cylinder 16a can be stirred (heated if necessary), and by moving the screw 16c forward, the liquid resin in the cylinder 16a is injected into the injection nozzle 16d. From the desired pressure and flow rate. The cylinder 16a is connected to a raw material reservoir (not shown), and receives supply of resin from the raw material reservoir at an appropriate timing and amount.
　図１等に示す射出成形機１０の動作の概要について説明する。まず、可動金型４２と固定金型４１とを成形に適する温度まで加熱する。次に、開閉駆動装置１５を動作させ、可動金型４２を固定金型４１側に前進させて型閉じを行い、さらに、可動金型４２と固定金型４１とを必要な圧力で締め付ける型締めを行う。次に、射出装置１６を動作させて、型締めされた可動金型４２と固定金型４１との間に形成されたキャビティ中に、射出装置１６の射出ノズル１６ｄから射出される樹脂をスプル部分ＳＰ等を介して注入する。キャビティ中に射出され充填された樹脂は、適当な温度に加熱されて固化する。つまり、この場合、成形用の樹脂としてエネルギー硬化性樹脂である熱硬化性樹脂を用いており、例えばシリコーン樹脂、アリルエステル、アクリル系樹脂、エポキシ樹脂、ポリイミド、ウレタン系樹脂等がこの熱硬化性樹脂に該当する。次に、開閉駆動装置１５を動作させて、可動金型４２を後退させ、可動金型４２を固定金型４１から離間させる型開きを行わせる。この結果、成形品は、例えば可動金型４２に保持された状態で固定金型４１から離型される。可動金型４２に残った成形品は、例えばエジェクタ（不図示）によって押し出されて可動金型４２から離型される。なお、両金型４１，４２から離型された成形品は、射出成形機１０の外部に搬出される。 An outline of the operation of the injection molding machine 10 shown in FIG. First, the movable mold 42 and the fixed mold 41 are heated to a temperature suitable for molding. Next, the opening / closing drive device 15 is operated, the movable mold 42 is advanced to the fixed mold 41 side, the mold is closed, and further, the mold clamping is performed to clamp the movable mold 42 and the fixed mold 41 with a necessary pressure. I do. Next, the injection device 16 is operated, and the resin injected from the injection nozzle 16d of the injection device 16 is sprung into the cavity formed between the clamped movable die 42 and the fixed die 41. Inject through SP or the like. The resin injected and filled into the cavity is heated to an appropriate temperature and solidified. That is, in this case, a thermosetting resin, which is an energy curable resin, is used as a molding resin. For example, silicone resins, allyl esters, acrylic resins, epoxy resins, polyimides, urethane resins, and the like are used as thermosetting resins. Corresponds to resin. Next, the opening / closing drive device 15 is operated to retract the movable mold 42 and perform mold opening to separate the movable mold 42 from the fixed mold 41. As a result, the molded product is released from the fixed mold 41 while being held by the movable mold 42, for example. The molded product remaining in the movable mold 42 is pushed out by, for example, an ejector (not shown) and released from the movable mold 42. The molded product released from both molds 41 and 42 is carried out of the injection molding machine 10.
　図３は、射出ノズル１６ｄの構造を説明する部分断面図である。射出ノズル１６ｄは、ノズル本体３１と、シリンダ先端部３２と、締結ネジ３３と、シール部材３４とを備える。 FIG. 3 is a partial cross-sectional view illustrating the structure of the injection nozzle 16d. The injection nozzle 16d includes a nozzle main body 31, a cylinder tip 32, a fastening screw 33, and a seal member 34.
　ノズル本体３１は、筒状の金属部材であり、内部に中心の軸ＡＸに沿って延びる通路３１ａを有し、先端に先細りの接続部３１ｂを有する。接続部３１ｂには、通路３１ａから延びる開口ＯＰが形成されている。また、ノズル本体３１は、その根元側に、シリンダ先端部３２に設けた嵌合孔３２ｂ内に挿入されてこれと嵌合する挿入部３１ｃを有する。また、ノズル本体３１は、そのうち挿入部３１ｃよりも先端側の部分の周囲に、シリンダ先端部３２の先端面３２ｃに当接するフランジ部３１ｄを有する。フランジ部３１ｄには、その円周に沿って例えば８つの開口３１ｆが例えば等間隔で形成されており、ノズル本体３１をシリンダ先端部３２に固定するための締結ネジ３３を通すことができる。 The nozzle body 31 is a cylindrical metal member, has a passage 31a extending along the central axis AX inside, and has a tapered connecting portion 31b at the tip. An opening OP extending from the passage 31a is formed in the connection portion 31b. Further, the nozzle body 31 has an insertion portion 31c on the base side thereof, which is inserted into a fitting hole 32b provided in the cylinder tip portion 32 and fitted therewith. Further, the nozzle body 31 has a flange portion 31d that comes into contact with the distal end surface 32c of the cylinder distal end portion 32 around the portion closer to the distal end than the insertion portion 31c. For example, eight openings 31f are formed at equal intervals along the circumference of the flange portion 31d, and a fastening screw 33 for fixing the nozzle body 31 to the cylinder tip portion 32 can be passed therethrough.
　シリンダ先端部３２は、シリンダ１６ａの一部を兼ねる直筒状の金属部材であり、スクリュ１６ｃを進退可能に通す円形断面の樹脂流路３２ａを有する。シリンダ先端部３２の先端部には、樹脂流路３２ａよりも大径の孔である嵌合孔３２ｂが形成されており、この嵌合孔３２ｂは、軸ＡＸに沿って樹脂流路３２ａと同軸に延びる。嵌合孔３２ｂには、上述のように、ノズル本体３１の挿入部３１ｃが着脱可能に嵌合する。この際、嵌合孔３２ｂの内径は、挿入部３１ｃの外径と殆ど一致しており、挿入部３１ｃが嵌合孔３２ｂ内で滑らかに摺動することが許容されるとともに、樹脂流路３２ａ中のエネルギー硬化性樹脂が嵌合孔３２ｂと挿入部３１ｃとの隙間に流れ込むことが抑制される。シリンダ先端部３２の先端面３２ｃは、軸ＡＸに垂直に加工されており、８つのネジ穴３２ｅを有する。これらのネジ穴３２ｅは、それぞれフランジ部３１ｄの開口３１ｆに対応するものであり、例えば円周に沿って等間隔で形成されている。シリンダ先端部３２において、嵌合孔３２ｂの先端側の外縁、すなわち先端面３２ｃの内縁には、環状の窪みである座部分３２ｆが形成されている。この座部分３２ｆは、シール部材３４を周囲から保持するとともに、シール部材３４を嵌合孔３２ｂの内側や先端側に露出させる。 The cylinder tip 32 is a straight cylindrical metal member that also serves as a part of the cylinder 16a, and includes a resin passage 32a having a circular cross section through which the screw 16c can be advanced and retracted. A fitting hole 32b, which is a hole having a diameter larger than that of the resin flow path 32a, is formed at the tip end of the cylinder front end portion 32. The fitting hole 32b is coaxial with the resin flow path 32a along the axis AX. It extends to. As described above, the insertion portion 31c of the nozzle body 31 is detachably fitted into the fitting hole 32b. At this time, the inner diameter of the fitting hole 32b almost coincides with the outer diameter of the insertion portion 31c, and the insertion portion 31c is allowed to slide smoothly in the fitting hole 32b, and the resin flow path 32a. The energy curable resin therein is prevented from flowing into the gap between the fitting hole 32b and the insertion portion 31c. A front end surface 32c of the cylinder front end portion 32 is machined perpendicular to the axis AX and has eight screw holes 32e. Each of these screw holes 32e corresponds to the opening 31f of the flange portion 31d, and is formed at regular intervals along the circumference, for example. In the cylinder front end portion 32, a seat portion 32f that is an annular recess is formed at the outer edge on the front end side of the fitting hole 32b, that is, the inner edge of the front end surface 32c. The seat portion 32f holds the seal member 34 from the periphery, and exposes the seal member 34 to the inside and the front end side of the fitting hole 32b.
　締結ネジ３３は、金属製の材料で形成されており、シリンダ先端部３２の先端面３２ｃに設けたネジ穴３２ｅにねじ込まれる。ここで、ノズル本体３１をシリンダ先端部３２の先端に予め取り付けてあり、締結ネジ３３によってノズル本体３１のフランジ部３１ｄをシリンダ先端部３２に締め付けるので、ノズル本体３１をシリンダ先端部３２に確実に固定することができる。この際、フランジ部３１ｄの裏面３１ｇがシリンダ先端部３２の先端面３２ｃに密着するので、ノズル本体３１とシリンダ先端部３２との液密性を保って、両者の隙間からエネルギー硬化性樹脂が外部に漏れ出すことを確実に防止できる。なお、締結ネジ３３は、シリンダ先端部３２のネジ穴３２ｅと、ノズル本体３１のフランジ部３１ｄと協働して、ネジ締め式の固定部として機能する。 The fastening screw 33 is made of a metal material and is screwed into a screw hole 32e provided in the tip surface 32c of the cylinder tip 32. Here, since the nozzle body 31 is attached in advance to the tip of the cylinder tip 32 and the flange 31d of the nozzle body 31 is fastened to the cylinder tip 32 by the fastening screw 33, the nozzle body 31 is securely attached to the cylinder tip 32. Can be fixed. At this time, since the back surface 31g of the flange portion 31d is in close contact with the tip surface 32c of the cylinder tip portion 32, the liquid-tightness between the nozzle body 31 and the cylinder tip portion 32 is maintained, and the energy curable resin is externally exposed from the gap between the two. It is possible to reliably prevent leakage. The fastening screw 33 functions as a screw-type fixing portion in cooperation with the screw hole 32e of the cylinder tip portion 32 and the flange portion 31d of the nozzle body 31.
　シール部材３４は、シリコーンゴム等の弾性体で形成されたＯリングであり、上述のように、シリンダ先端部３２の先端内縁の座部分３２ｆに保持されている。また、ノズル本体３１をシリンダ先端部３２に固定する際に、シール部材３４は、座部分３２ｆとフランジ部３１ｄの内縁３１ｈとの間に挟持されて、外部にエネルギー硬化性樹脂が漏れ出すことを防止している。なお、ノズル本体３１をシリンダ先端部３２に固定する際に、フランジ部３１ｄの裏面３１ｈとシリンダ先端部３２の先端面３２ｃとの密着が確保されれば、シール部材３４をあえて設ける必要はないが、シール部材３４により、フランジ部３１ｄの内縁３１ｈや裏面３１ｇに漏れ出すエネルギー硬化性樹脂の量を減らすことができる。ここで、シール部材３４は、嵌合孔３２ｂと挿入部３１ｃとの間の僅かの隙間をシールすることになるので、エネルギー硬化性樹脂のリークを十分な余裕をもって阻止することができる。 The seal member 34 is an O-ring formed of an elastic body such as silicone rubber, and is held on the seat portion 32f on the inner edge of the tip end of the cylinder 32 as described above. Further, when the nozzle body 31 is fixed to the cylinder tip portion 32, the seal member 34 is sandwiched between the seat portion 32f and the inner edge 31h of the flange portion 31d so that the energy curable resin leaks to the outside. It is preventing. Note that when the nozzle body 31 is fixed to the cylinder tip portion 32, the seal member 34 need not be provided if the back surface 31h of the flange portion 31d and the tip surface 32c of the cylinder tip portion 32 are secured. The amount of the energy curable resin leaking to the inner edge 31h and the back surface 31g of the flange portion 31d can be reduced by the seal member 34. Here, since the sealing member 34 seals a slight gap between the fitting hole 32b and the insertion portion 31c, leakage of the energy curable resin can be prevented with a sufficient margin.
　ノズル本体３１の例えば交換について説明すると、まず締結ネジ３３を全て緩めてノズル本体３１のフランジ部３１ｄの固定を解除する。次に、ノズル本体３１を適当な治具で挟んでシリンダ先端部３２から引き抜く。この際、シール部材３４を交換することもできるが、劣化していなければ再利用することもできる。その後、新たなノズル本体３１を挿入部３１ｃが嵌合孔３２ｂに嵌合するようにシリンダ先端部３２に取り付ける。この状態で、フランジ部３１ｄの各開口３１ｆを各ネジ穴３２ｅと一致させた状態で、全てのネジ穴３２ｅに締結ネジ３３をねじ込んで締付ける。 For example, replacement of the nozzle body 31 will be described. First, all the fastening screws 33 are loosened, and the fixing of the flange portion 31d of the nozzle body 31 is released. Next, the nozzle body 31 is sandwiched by a suitable jig and pulled out from the cylinder tip 32. At this time, the seal member 34 can be replaced, but can be reused if it is not deteriorated. Thereafter, a new nozzle body 31 is attached to the cylinder tip 32 so that the insertion portion 31c is fitted in the fitting hole 32b. In this state, with the openings 31f of the flange 31d aligned with the screw holes 32e, the fastening screws 33 are screwed into all the screw holes 32e and tightened.
　図４は、射出ノズル１６ｄの動作を説明する側面図である。射出時、射出ノズル１６ｄは、成形金型４０を構成する一方の固定金型４１の裏面に形成された接続部４１ｈに当接して必要な圧力で付勢される。接続部４１ｈは、スプル部分ＳＰの入り口に設けた開口でもあり、射出ノズル１６ｄに設けた接続部３１ｂの先端が嵌合するような形状を有する。なお、射出ノズル１６ｄを用いて樹脂の射出を行う際には、予め固定金型４１と可動金型４２とを接合させて型締め状態とするとともに、両金型４１，４２を樹脂の硬化に適する温度まで昇温しておく。 FIG. 4 is a side view for explaining the operation of the injection nozzle 16d. At the time of injection, the injection nozzle 16d abuts against a connection portion 41h formed on the back surface of one fixed mold 41 constituting the molding die 40 and is biased with a necessary pressure. The connection portion 41h is also an opening provided at the entrance of the sprue portion SP, and has a shape such that the tip of the connection portion 31b provided in the injection nozzle 16d is fitted. When injecting the resin using the injection nozzle 16d, the fixed mold 41 and the movable mold 42 are joined in advance to be in a mold-clamping state, and both the molds 41 and 42 are cured. Raise the temperature to a suitable temperature.
　射出ノズル１６ｄから射出されたエネルギー硬化性樹脂は、固定金型４１と可動金型４２との型締めによって形成される型空間であるスプル部分ＳＰを経て、スプル部分ＳＰに連通するキャビティに導入される。なお、固定金型４１は、型板４１ａ上に胴型４１ｂを固定しており、胴型４１ｂの適所に形成された多数のコア挿通孔４１ｃには、レンズ面形成用のコア型４１ｄが埋め込むようにして固定されている。また、可動金型４２は、型板４２ａ上に胴型４２ｂを固定しており、胴型４２ｂの適所に形成された多数のコア挿通孔４２ｃには、レンズ面形成用のコア型４２ｄが埋め込むようにして固定されている。以上において、固定金型４１のコア型４１ｄと、可動金型４２のコア型４２ｄとの間に、スプル部分ＳＰに連通する多数のキャビティが形成され、これらのキャビティにエネルギー硬化性樹脂を充填することで射出が完了する。 The energy curable resin injected from the injection nozzle 16d is introduced into a cavity communicating with the sprue portion SP through a sprue portion SP which is a mold space formed by clamping the fixed die 41 and the movable die 42. The The fixed mold 41 has a body mold 41b fixed on a mold plate 41a, and a core mold 41d for lens surface formation is embedded in a large number of core insertion holes 41c formed at appropriate positions of the body mold 41b. It is fixed in this way. The movable mold 42 has a barrel mold 42b fixed on a mold plate 42a, and a core mold 42d for lens surface formation is embedded in a large number of core insertion holes 42c formed at appropriate positions of the barrel mold 42b. It is fixed in this way. In the above, a large number of cavities communicating with the sprue portion SP are formed between the core mold 41d of the fixed mold 41 and the core mold 42d of the movable mold 42, and these cavities are filled with the energy curable resin. This completes the injection.
　なお、固定金型４１及び可動金型４２は、既に説明したように適度に加熱されており、スプル部分ＳＰやキャビティ中に導入されたエネルギー硬化性樹脂を徐々に硬化させる。これにより、コア型４１ｄ先端の光学面とコア型４２ｄ先端の光学面とに対応する形状のレンズを配列したレンズアレイを得ることができる。 The fixed mold 41 and the movable mold 42 are appropriately heated as already described, and gradually cure the energy curable resin introduced into the sprue portion SP and the cavity. Thereby, it is possible to obtain a lens array in which lenses having shapes corresponding to the optical surface at the tip of the core die 41d and the optical surface at the tip of the core die 42d are arranged.
　以上で説明した第１実施形態の射出ノズル１６ｄによれば、固定部としての締結ネジ３３やフランジ部３１ｄが、エネルギー硬化性樹脂を流すシリンダ１６ａの内面側よりも外側にはずれる位置に設けられているので、締結ネジ３３等によってノズル本体３１の簡易な着脱を確保しつつも、固定部の締結ネジ３３とネジ穴３２ｅとの間や近辺にシリンダ１６ａ内の液状のエネルギー硬化性樹脂が漏れ込んで硬化することを防止できる。これにより、ノズル本体３１の分離が困難になること、すなわちノズル本体３１の分解掃除や交換が困難になることを防止できる。 According to the injection nozzle 16d of the first embodiment described above, the fastening screw 33 or the flange portion 31d as the fixing portion is provided at a position that is outside the inner side of the cylinder 16a through which the energy curable resin flows. Therefore, the liquid energy curable resin in the cylinder 16a leaks between or near the fastening screw 33 and the screw hole 32e of the fixing portion, while securing the simple attachment / detachment of the nozzle body 31 with the fastening screw 33 or the like. Can be prevented from curing. Thereby, it becomes possible to prevent the separation of the nozzle body 31 from being difficult, that is, it is difficult to disassemble and clean the nozzle body 31 or to replace it.
　また、第１実施形態の射出成形機１０は、上記のような射出ノズル１６ｄを組み込んだものであり、多様な樹脂材料の射出成形に適し長期間にわたって高精度に動作しメンテナンスが簡易であるといった特徴を有する。 The injection molding machine 10 of the first embodiment incorporates the injection nozzle 16d as described above, is suitable for injection molding of various resin materials, operates with high accuracy over a long period of time, and is easy to maintain. Has characteristics.
　〔第２実施形態〕
　以下、第２実施形態に係る射出ノズル等について説明する。なお、第２実施形態に係る射出ノズル等は、第１実施形態を変形したものであり、特に説明しない部分については、第１実施形態と同様であるものとする。 [Second Embodiment]
Hereinafter, an injection nozzle and the like according to the second embodiment will be described. The injection nozzle according to the second embodiment is a modification of the first embodiment, and parts that are not particularly described are the same as those in the first embodiment.
　図５は、本実施形態における射出ノズルの構造を説明する部分断面図である。この射出ノズル１１６ｄのノズル本体３１は、フランジ部３１ｄの外縁から軸ＡＸ方向に沿ってシリンダ先端部３２側に延びるネジ部１３３を備える。ネジ部１３３の内側には、シリンダ先端部３２の先端が嵌り込む。この際、ネジ部１３３の内面に形成された雌ネジＳ１と、シリンダ先端部３２先端の周囲に形成された雄ネジＳ２とが螺合して、ノズル本体３１がシリンダ先端部３２に固定される。なお、ノズル本体３１をネジ付けてシリンダ先端部３２に固定する際、シール部材３４が座部分３２ｆとフランジ部３１ｄの内縁３１ｈとの間に挟持される。シール部材３４は、フランジ部３１ｄの裏面３１ｇと、シリンダ先端部３２の先端面３２ｃとの間にエネルギー硬化性樹脂が漏れ出すことを防止している。この場合も、固定部としてのフランジ部３１ｄ、雌ネジＳ１、及び雄ネジＳ２が、エネルギー硬化性樹脂を流すシリンダ１６ａの内面側からはずれる位置に設けられているので、ネジＳ１，Ｓ２等によってノズル本体３１の簡易な着脱を確保しつつも、固定部のネジＳ１，Ｓ２間やその周辺にシリンダ１６ａ内の液状のエネルギー硬化性樹脂が漏れ込んで硬化することを防止できる。これにより、ノズル本体３１の分離が困難になること、すなわちノズル本体３１の分解掃除や交換が困難になることを防止できる。 FIG. 5 is a partial cross-sectional view illustrating the structure of the injection nozzle in the present embodiment. The nozzle body 31 of the injection nozzle 116d includes a threaded portion 133 that extends from the outer edge of the flange portion 31d toward the cylinder distal end portion 32 along the axis AX direction. The tip of the cylinder tip 32 is fitted inside the screw part 133. At this time, the female screw S1 formed on the inner surface of the screw portion 133 and the male screw S2 formed around the tip of the cylinder tip 32 are screwed together, and the nozzle body 31 is fixed to the cylinder tip 32. . When the nozzle body 31 is screwed and fixed to the cylinder tip portion 32, the seal member 34 is sandwiched between the seat portion 32f and the inner edge 31h of the flange portion 31d. The seal member 34 prevents the energy curable resin from leaking between the back surface 31 g of the flange portion 31 d and the tip surface 32 c of the cylinder tip portion 32. Also in this case, the flange portion 31d as the fixing portion, the female screw S1, and the male screw S2 are provided at positions away from the inner surface side of the cylinder 16a through which the energy curable resin flows. While securing the simple attachment / detachment of the main body 31, it is possible to prevent the liquid energy curable resin in the cylinder 16a from leaking into and being cured between the screws S1 and S2 of the fixing portion and the periphery thereof. Thereby, it becomes possible to prevent the separation of the nozzle body 31 from being difficult, that is, it is difficult to disassemble and clean the nozzle body 31 or to replace it.
　以上実施形態に即して本発明を説明したが、本発明は、上記実施形態に限定されるものではなく、様々な変形が可能である。例えば、上記実施形態では、エネルギー硬化性樹脂として熱硬化性樹脂を用いる場合について説明したが、熱硬化性樹脂の代わりに紫外線硬化性樹脂を図３等に示す射出ノズル１６ｄから射出させて成形を行うこともできる。ここで、紫外線硬化性樹脂には、例えばシリコーン樹脂、アクリル系樹脂、エポキシ樹脂、ポリイミド、ウレタン系樹脂等が含まれる。なお、エネルギー硬化性樹脂以外の樹脂、例えば熱可塑性樹脂の粘性が低い場合には、かかる熱可塑性樹脂を図３等に示す射出ノズル１６ｄから射出させて成形を行うこともでき、溶融した熱可塑性樹脂が固定部すなわち締結ネジ３３、ネジＳ１，Ｓ２等の周辺に漏れ込むことを防止できる。 Although the present invention has been described based on the above embodiments, the present invention is not limited to the above embodiments, and various modifications are possible. For example, in the above embodiment, the case where a thermosetting resin is used as the energy curable resin has been described. However, instead of the thermosetting resin, an ultraviolet curable resin is injected from the injection nozzle 16d shown in FIG. It can also be done. Here, the ultraviolet curable resin includes, for example, silicone resin, acrylic resin, epoxy resin, polyimide, urethane resin, and the like. If the viscosity of a resin other than the energy curable resin, such as a thermoplastic resin, is low, the thermoplastic resin can be injected from the injection nozzle 16d shown in FIG. It is possible to prevent the resin from leaking around the fixing portion, that is, the fastening screw 33, the screws S1, S2, and the like.
　また、固定部の構造としては、締結ネジ３３によってノズル本体３１から延びるフランジ部３１ｄをシリンダ先端部３２の先端面３２ｃに締付けるものや、ネジ部１３３によってフランジ部３１ｄをシリンダ先端部３２の先端面３２ｃに締付けるものに限らず、ノズル本体３１をシリンダ先端部３２に固定できる様々なタイプのネジ締め機構を用いることができる。 Further, as a structure of the fixing portion, a flange portion 31d extending from the nozzle body 31 by the fastening screw 33 is fastened to the tip surface 32c of the cylinder tip portion 32, or a flange portion 31d is fastened to the tip surface of the cylinder tip portion 32 by the screw portion 133 Various types of screw tightening mechanisms that can fix the nozzle body 31 to the cylinder tip portion 32 can be used, not limited to those tightened to 32c.
　また、上記実施形態では、嵌合孔３２ｂと挿入部３１ｃとの間にシール部材３４を設けているが、これに追加して又はこれに代えて、別のシールを設けることもできる。例えば、フランジ部３１ｄの裏面３１ｇとシリンダ先端部３２の先端面３２ｃとの間にＯリング等の環状のシールを配置して、締結ネジ３３やネジ部１３３への樹脂のリークを補強的に防止することができる。また、フランジ部３１ｄの裏面３１ｇとシリンダ先端部３２の先端面３２ｃとの間に環状の印ろう構造を設けて樹脂のリークを補強的に防止することができる。 In the above embodiment, the seal member 34 is provided between the fitting hole 32b and the insertion portion 31c. However, another seal can be provided in addition to or instead of this. For example, an annular seal such as an O-ring is disposed between the back surface 31g of the flange portion 31d and the front end surface 32c of the cylinder front end portion 32 to prevent leakage of resin to the fastening screw 33 and the screw portion 133 in a reinforcing manner. can do. Further, an annular marking structure can be provided between the back surface 31g of the flange portion 31d and the front end surface 32c of the cylinder front end portion 32 to prevent resin leakage in a reinforcing manner.
　また、シール部材３４は、シリコ－ン等の樹脂製のＯリングに限らず、例えばメタル製のＯリングとすることもできる。 Further, the seal member 34 is not limited to a resin O-ring such as silicon, but may be a metal O-ring, for example.
　また、嵌合孔３２ｂ及び挿入部３１ｃは円筒面を有するものに限らず、テーパ面を有するものとできる。具体的には、嵌合孔３２ｂを先端で広がるテーパ面にし、挿入部３１ｃを先端で狭まるテーパ面にすることで、嵌合孔３２ｂ及び挿入部３１ｃのテーパ面が互いに嵌合するようなものとできる。この場合、嵌合孔３２ｂと挿入部３１ｃとの密着性を高めることができる。 Further, the fitting hole 32b and the insertion portion 31c are not limited to those having a cylindrical surface, but may have a tapered surface. Specifically, the fitting hole 32b is a tapered surface that widens at the tip, and the insertion portion 31c is a tapered surface that narrows at the tip, so that the fitting hole 32b and the tapered surface of the insertion portion 31c are fitted together. And can. In this case, the adhesion between the fitting hole 32b and the insertion portion 31c can be enhanced.
　また、固定金型４１及び可動金型４２で構成される射出成形金型に設けるキャビティの形状は、図示のものに限らず、様々な形状とすることができる。すなわち、成形金型４０によって射出成形する成形品は、レンズアレイに限らず、様々な光学部品やそれ以外の樹脂製品とできる。 Moreover, the shape of the cavity provided in the injection mold composed of the fixed mold 41 and the movable mold 42 is not limited to the illustrated one, and various shapes can be used. That is, the molded product that is injection-molded by the molding die 40 is not limited to the lens array, and can be various optical components and other resin products.
　１０…射出成形機
　１１…固定盤
　１２…可動盤
　１５…開閉駆動装置
　１６…射出装置
　１６ａ…シリンダ
　１６ｃ…スクリュ
　１６ｄ…射出ノズル
　１６ｅ…駆動部
　３１…ノズル本体
　３１ａ…通路
　３１ｂ…接続部
　３１ｃ…挿入部
　３１ｄ…フランジ部
　３１ｇ…裏面
　３１ｈ…内縁
　３２…シリンダ先端部
　３２ａ…樹脂流路
　３２ｂ…嵌合孔
　３２ｃ…先端面
　３２ｅ…ネジ穴
　３２ｆ…座部分
　３３…締結ネジ
　３４…シール部材
　４０…成形金型
　４１…固定金型
　４１ｈ…開口としての接続部
　可動金型…４２
　ＡＸ…軸
　ＯＰ…開口
　ＳＰ…スプル部分 DESCRIPTION OF SYMBOLS 10 ... Injection molding machine 11 ... Fixed board 12 ... Movable board 15 ... Opening and closing drive device 16 ... Injection device 16a ... Cylinder 16c ... Screw 16d ... Injection nozzle 16e ... Drive part 31 ... Nozzle main body 31a ... Passage 31b ... Connection part 31c ... Insertion Part 31d ... Flange 31g ... Back 31h ... Inner edge 32 ... Cylinder tip 32a ... Resin flow path 32b ... Fitting hole 32c ... Tip surface 32e ... Screw hole 32f ... Seat part 33 ... Fastening screw 34 ... Seal member 40 ... Mold Mold 41 ... Fixed mold 41h ... Connection part as opening Movable mold ... 42
AX ... Shaft OP ... Opening SP ... Sprue part

Claims (9)

  1. 　シリンダの先端部に設けられ、先端を金型の開口に突き当てた状態でシリンダ内の樹脂材料を前記金型内に注入するための射出ノズルであって、
    　前記樹脂材料を流す流路に沿った前記シリンダの内面側からはずれる位置に、ノズル本体を前記シリンダの先端部に固定するネジ締め式の固定部が設けられていることを特徴とする射出ノズル。     An injection nozzle provided at the tip of the cylinder for injecting the resin material in the cylinder into the mold with the tip abutted against the opening of the mold,
    An injection nozzle characterized in that a screw fastening type fixing part for fixing the nozzle body to the tip of the cylinder is provided at a position along the flow path through which the resin material flows from the inner surface side of the cylinder.
  2. 　前記ノズル本体は、前記シリンダの先端部に設けた嵌合孔に挿入される挿入部と、前記挿入部よりも先端側の部分の周囲に形成された、前記シリンダの先端部に当接するとともに、前記シリンダの先端部に配されたネジ穴に対応する位置に配された開口を有するフランジ部と、を有し、
    前記開口を介して前記ネジ穴に螺合するネジ部材により前記シリンダの先端部に固定されることを特徴とする請求項１に記載の射出ノズル。     The nozzle body abuts against an insertion portion inserted into a fitting hole provided at a distal end portion of the cylinder and a distal end portion of the cylinder formed around a portion closer to the distal end than the insertion portion, A flange portion having an opening disposed at a position corresponding to a screw hole disposed at a tip portion of the cylinder,
    The injection nozzle according to claim 1, wherein the injection nozzle is fixed to a tip portion of the cylinder by a screw member screwed into the screw hole through the opening.
  3. 　前記固定部と前記流路との間にリング状のシール部材を配置したことを特徴とする請求項２に記載の射出ノズル。 The injection nozzle according to claim 2, wherein a ring-shaped seal member is disposed between the fixed portion and the flow path.
  4. 　前記シール部材は、前記シリンダの先端部と前記ノズル本体との間に挟持される弾性体であることを特徴とする請求項３に記載の射出ノズル。 4. The injection nozzle according to claim 3, wherein the seal member is an elastic body sandwiched between a tip portion of the cylinder and the nozzle body.
  5. 　前記ノズル本体は、前記シリンダの先端部に設けた嵌合孔に挿入される挿入部と、前記挿入部よりも先端側の部分の周囲に形成された前記シリンダの先端部に当接するフランジ部と、を有し、前記フランジ部は、前記シリンダの先端部に螺合可能なネジ部を有し、前記ネジ部の螺合により前記シリンダの先端部に固定されることを特徴とする請求項１に記載の射出ノズル。 The nozzle body includes an insertion portion that is inserted into a fitting hole provided at a tip portion of the cylinder, and a flange portion that is formed around a tip side portion of the cylinder and that is in contact with the tip portion of the cylinder. The flange portion has a screw portion that can be screwed to the tip portion of the cylinder, and is fixed to the tip portion of the cylinder by screwing the screw portion. The injection nozzle described in.
  6. 　前記嵌合孔の先端の外縁と前記フランジ部の裏面の内縁との間にリング状のシール部材を配置したことを特徴とする請求項５に記載の射出ノズル。 6. The injection nozzle according to claim 5, wherein a ring-shaped seal member is disposed between an outer edge at a front end of the fitting hole and an inner edge on the back surface of the flange portion.
  7. 　前記シール部材は、前記外縁に設けた窪みである座部分に保持されることを特徴とする請求項６に記載の射出ノズル。 The injection nozzle according to claim 6, wherein the seal member is held by a seat portion which is a recess provided in the outer edge.
  8. 　前記シリンダを介してノズル本体に導かれる樹脂材料は、エネルギー硬化性樹脂であることを特徴とする請求項１から請求項６までのいずれか一項に記載の射出ノズル。 The injection nozzle according to any one of claims 1 to 6, wherein the resin material guided to the nozzle body through the cylinder is an energy curable resin.
  9. 　請求項１から請求項７までのいずれか一項に記載の射出ノズルを備え、前記射出ノズルから前記金型内に前記樹脂材料を射出することによって樹脂の成形を行うことを特徴とする射出成形機。 An injection molding comprising the injection nozzle according to any one of claims 1 to 7, wherein the resin material is molded by injecting the resin material into the mold from the injection nozzle. Machine.
PCT/JP2009/065060 2008-09-30 2009-08-28 Injection nozzle and injection molding machine WO2010038567A1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111715881A (en) * 2019-03-19 2020-09-29 株式会社日本制钢所 Temperature control method for heating cylinder of metal injection molding machine

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH1044191A (en) * 1996-08-08 1998-02-17 Nissei Plastics Ind Co Shut-off nozzle of injection device
JP2001138372A (en) * 1999-11-12 2001-05-22 Sumitomo Heavy Ind Ltd Back flow preventing device and method for operating injection device

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH1044191A (en) * 1996-08-08 1998-02-17 Nissei Plastics Ind Co Shut-off nozzle of injection device
JP2001138372A (en) * 1999-11-12 2001-05-22 Sumitomo Heavy Ind Ltd Back flow preventing device and method for operating injection device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111715881A (en) * 2019-03-19 2020-09-29 株式会社日本制钢所 Temperature control method for heating cylinder of metal injection molding machine

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