Injection molding machine

Abstract

The present invention is to provide an injection molding machine that does not deform even if a large fastening force is applied to a flange portion, and that can suppress abrasion, seizure, or resin leakage of an abutting surface caused by the deformation. In order to solve the above problem, the present invention provides an injection molding machine 1 that injects molten resin into a cavity formed in a mold 6, and that includes: a hot runner manifold 3 that supplies molten resin to the cavity; and a nozzle portion 5 that communicates the hot runner manifold 3 and the cavity; the nozzle portion 5 has a flange portion 7 that forms an inclined portion 11 and an abutting end portion 10, the inclined portion 11 is sandwiched between the hot runner manifold 3 and the mold 6, and expands outward from an axis of the nozzle portion 5 in conjunction with separation of the axis from the hot runner manifold 3, and the abutting end portion 10 abuts the mold 6 at an extension end of the inclined portion 11. One aspect has a wall portion 12 that is provided standing from the flange portion 7 toward the hot runner manifold 3, and has an abutting surface 13 that abuts the hot runner manifold 3 at an upper end.

Description

TECHNICAL FIELD

[0001] The present application relates to an injection molding machine. BACKGROUND

[0002] A general injection molding machine is provided with a nozzle that communicates a hot runner with a cavity in a mold. Such a nozzle is fixed by being clamped between prescribed parts between the hot runner and the mold with its flange portion (for example, refer to Patent Document 1).

[0003] [PRIOR ART DOCUMENTS]

[0004] (Patent Document)

[0005] Patent Document 1: Japanese Patent Application Laid-Open No. 2021-30703 SUMMARY

[0006] [PROBLEMS TO BE SOLVED BY THE INVENTION]

[0007] The flange portion of the nozzle as described in Patent Document 1 is deformed by being fastened with a strong force, and scratch, bite or resin leakage can occur at the joint surface of the flange portion.

[0008] The present application has been made in view of the above circumstances, and aims to provide an injection molding machine that does not deform even if a greater fastening force is applied to the flange portion, and that can suppress scratch, bite or resin leakage at the abutting surface due to the deformation. It also aims to extend the maintenance period and service life of the injection molding machine. That is, the period of equipment renewal is extended, and further, the opportunity of generating large waste is reduced, and the effects of environmental protection and resource saving are contributed.

[0009] [MEANS OF SOLVING THE PROBLEMS]

[0010] (1) An injection molding machine (for example, the injection molding machine 1 described later) that injects molten resin into a cavity formed on a mold (for example, the mold 6 described later), wherein the injection molding machine is provided with: a hot runner manifold (for example, the hot runner manifold 3 described later) that supplies molten resin to the aforementioned cavity; and a nozzle portion (for example, the nozzle portion 5 described later) that communicates the aforementioned hot runner manifold with the aforementioned cavity; the aforementioned nozzle portion has a flange portion (for example, the flange portion 7 described later) that is formed with an inclined portion (for example, the inclined portion 11 described later) that is clamped between the aforementioned hot runner manifold and the aforementioned mold and expands outward from the axis of the aforementioned nozzle portion in conjunction with separation from the aforementioned hot runner manifold, and an abutting end portion that abuts against the aforementioned mold at the extension end of the aforementioned inclined portion.

[0011] (2) The injection molding machine according to the above (1), having a wall portion (for example, wall portion 12 described later) which is provided standing from the flange portion toward the hot runner manifold, the wall portion having an abutting surface (for example, abutting surface 13 described later) which abuts against the hot runner manifold at an upper end thereof.

[0012] (3) The injection molding machine according to the above (1), wherein the nozzle portion and the flange portion are separable.

[0013] (4) The injection molding machine according to the above (1), having a heater (for example, heater 17 described later) which heats the nozzle portion, and a through hole (for example, through hole 19 described later) which is formed in the inclined portion and through which a wiring (for example, wiring 18 described later) of the heater is led from the flange portion.

[0014] (5) The injection molding machine according to the above (1), wherein the mold has a recessed portion (for example, recessed portion 26 described later) which has a bottom surface portion (for example, bottom surface portion 24 described later) that receives the abutting end portion, and an inner side wall portion (for example, inner side wall portion 25 described later), the abutting end portion having a bottom surface abutting surface portion (for example, bottom surface abutting surface portion 27 described later) which abuts against the bottom surface portion (for example, bottom surface portion 24 described later) of the recessed portion in the axial direction of the nozzle portion, and an inner side wall abutting portion (for example, inner side wall abutting portion 28 described later) which abuts against the inner side wall portion (for example, inner side wall portion 25 described later) of the recessed portion, the inner side wall abutting portion having a recessed portion (for example, recessed portion 29 described later) which forms a gap between the inner side wall portions.

[0015] (EFFECTS OF THE INVENTION)

[0016] In the injection molding machine of (1), since the flange portion is formed to be inclined in a direction away from the hot runner manifold and the nozzle portion, when the nozzle portion is clamped between the hot runner manifold and the mold, deformation of the flange portion can be prevented, and leakage of resin can be suppressed.

[0017] In the injection molding machine of (2), the abutting surface provided at the upper end of the wall portion abuts against the hot runner manifold, whereby deformation of the flange portion can be more strongly suppressed.

[0018] In the injection molding machine of (3), the nozzle portion can be separated from the flange portion, whereby the strength of the flange portion can be improved, and the flange portion can be easily replaced at the time of maintenance.

[0019] In the injection molding machine of (4), the through hole through which, for example, a wiring for a heater or the like is led is provided in the inclined surface of the flange portion, whereby the flange portion can be completely positioned on the mold, and deformation of the flange portion can be effectively suppressed.

[0020] In the injection molding machine of (5), a clearance formed between the mold and the flange portion by the recess of the abutting end portion is utilized to produce a heat insulating effect between the mold and the flange.

[0021] The above effects extend the maintenance period and service life of the injection molding machine. Therefore, the period of equipment renewal is extended, and the opportunity of large-scale waste generation is reduced, which contributes to the effects of environmental protection and resource saving. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is a schematic view illustrating an injection molding machine as an embodiment of the present application.

[0023] Figure 2 is a view observing a part of the injection molding machine 1 from above. Figure 1

[0024] Figure 3 is an exploded sectional view illustrating the nozzle portion of the injection molding machine 1. Figure 1

[0025] Figure 4 is a perspective view illustrating the nozzle portion of the injection molding machine 1. Figure 3

[0026] Figure 5 is a sectional view illustrating another aspect of the nozzle portion in the injection molding machine as an embodiment of the present application.

[0027] Figure 6 is a schematic view illustrating an injection molding machine as a modified example of the embodiment of the present application. DETAILED DESCRIPTION

[0028] Hereinafter, an embodiment of the present application will be described with reference to the drawings. Figure 1 is a schematic view illustrating an injection molding machine 1 as an embodiment of the present application. Figure 2 is a view observing a part of the hot runner manifold of the injection molding machine 1 from above. Figure 3 is an exploded sectional view illustrating the nozzle portion of the injection molding machine 1. Figure 4 is a perspective view illustrating the nozzle portion of the injection molding machine 1. Figure 3

[0029] In Figure 1 ​​​​In the injection molding machine 1, the molten resin flowing into the hot runner manifold 3 through the injection nozzle 2 is configured to move in a resin passage 4 within the hot runner manifold 3 and be injected into a cavity of a mold 6 through a nozzle portion 5. The nozzle portion 5, which communicates the hot runner manifold 3 with the cavity, is clamped between the hot runner manifold 3 and the mold 6. The nozzle portion 5 has a flange portion 7 described later and is firmly clamped between the lower side of the hot runner manifold 3 and the upper side of the mold 6 and liquid-tightly fixed by the fastening force of a bolt 8 that fastens the hot runner manifold 3 and the mold 6.

[0030] The flange portion 7 has an inclined portion 11 that is inclined in such a manner as to separate from the axis of the nozzle portion 5 from an upper end abutment portion 9 of the nozzle portion 5 that abuts against the upper end of the hot runner manifold 3 toward an abutment end portion 10 that abuts against the mold 6 side. That is, the nozzle portion 5 has the flange portion 7 that is clamped between the hot runner manifold 3 and the mold 6 and forms the inclined portion 11 and the abutment end portion 10. The inclined portion 11 is a portion of the flange portion 7 that forms an inclined surface that expands outward from the axis of the nozzle portion 5 in conjunction with separation from the hot runner manifold 3 along the axis of the nozzle portion 5. The abutment end portion 10 is a portion at which the extension of the inclined portion 11 abuts against the mold 6. A wall portion 12 that stands from the flange portion 7 toward the hot runner manifold 3 is provided. The wall portion 12 has an abutment surface 13 that abuts against the hot runner manifold 3 at the upper end thereof. In the injection molding machine 1, since the flange portion 7 is formed to be inclined in a direction away from the hot runner manifold 3 and the nozzle portion 5, when the nozzle portion 5 is clamped between the hot runner manifold 3 and the mold 6, it is possible to prevent the flange portion 7 from deforming and to suppress leakage of the resin.

[0031] A resin passage 14 toward the cavity of the mold 6 is provided inside the nozzle portion 5. A needle pin 15 is disposed along the central axis in the resin passage 14 of the nozzle portion 5. The needle pin 15 advances and retreats by a cylinder actuator 16 to perform opening and closing operations of a needle valve portion (not shown) of a tip end portion. A heater 17 is provided on the nozzle portion 5 in such a manner as to surround the entire side surface thereof. A through-hole 19 that leads a wiring 18 for the heater 17 from the flange portion 7 is provided on the inclined portion 11. In the present example, the wall portion 12 is divided by a plurality of slit portions 20 that are provided along the circumferential direction, and the positions of the through-holes 19 correspond to the positions of the slit portions 20.

[0032] In Figure 3 and Figure 4 the example, the flange portion 7 can be separate from a nozzle main body 21 of the nozzle portion 5. An outer threaded portion 22 provided at the upper end side of the nozzle main body 21 is screwed with an inner threaded portion 23 provided at the upper inner periphery of the flange portion 7, and the nozzle main body 21 and the flange portion 7 integrally constitute the nozzle portion 5. Here, the material suitable for the flange portion 7 is, for example, an alloy tool steel material (SKD61) prescribed in JIS G4404 or the like. The material suitable for the nozzle main body 21 is, for example, a mechanical structural carbon steel material (S50C) prescribed in JIS G4051 or the like.

[0033] On the other hand, a recess 26 is formed on the mold 6, and the recess 26 has a bottom surface portion 24 that receives the abutting end portion 10 on the flange portion 7 side and an inner side wall portion 25 that abuts against the inner side wall portion 25 of the mold 6. Figure 1 The abutting end portion 10 has a bottom surface abutting surface portion 27 that abuts against the bottom surface portion 24 of the recess 26 and the nozzle portion 5 in the axial direction, and an inner side wall abutting portion 28 that abuts against the inner side wall portion 25 of the recess 26. The inner side wall abutting portion 28 has a recessed portion 29 that forms a gap between the inner side wall portion 25.

[0034] Figure 5 is a cross-sectional view that illustrates another mode of the nozzle portion 5 in the injection molding machine 1 according to the embodiment of the present application. Figure 5 The nozzle portion 5 of is formed of the flange portion 7 and the nozzle body 21 as a unit. The flange portion 7 has an inclined portion 11 that is inclined in such a manner that the axis of the nozzle portion 5 is separated from the abutting end portion 10 that abuts against the mold 6 side toward the upper end abutting portion 9 that abuts against the hot runner manifold 3. The flange portion 7 has a wall portion 12 that is provided standing from the abutting end portion 10 side toward the hot runner manifold 3. An abutting surface 13 that abuts against the hot runner manifold 3 is provided at the upper end of the wall portion 12.

[0035] The abutting surface 13 is a portion of the upper surface of the outer peripheral protruding portion 30 that protrudes in the outer periphery at a prescribed thickness at the upper end of the wall portion 12. The flange portion 7 is firmly fixed to the hot runner manifold 3a by a fastening nut 31 and a fastening bolt 32 that abut against the lower surface of the outer peripheral protruding portion 30. The fastening bolt 32 is provided so as to penetrate the hot runner manifold 3a in the thickness direction.

[0036] Further, the bolt head 33 of the fastening bolt 32 is embedded in a recessed portion 34 provided on the hot runner manifold 3a side and does not protrude from the upper surface of the hot runner manifold 3a. As described above, the nozzle portion 5 that extends downward from the hot runner manifold 3a and that is lowered in the mold 6 toward the cavity is fastened as a unit with the flange portion 7 and the hot runner manifold 3a. Therefore, at the time of maintenance, the hot runner manifold 3a and the nozzle portion 5 can be pulled out as a whole from the mold 6 toward the direction indicated by the arrow line A and assembled. The work efficiency at the time of maintenance is excellent compared to the case where the hot runner manifold 3a and the nozzle portion 5 are detached and assembled to the mold 6 respectively.

[0037] A heater 17 is provided on the nozzle body 21 of the nozzle portion 5 so as to surround the entire side surface thereof. A through hole 19 that guides a wiring 18 for the heater 17 from the flange portion 7 is provided on the inclined portion 11. Figure 5 The material of the nozzle portion 5 that is formed of the flange portion 7 and the nozzle body 21 as a unit in the mode of is, for example, an alloy tool steel material (SKD61) prescribed in JIS G4404 or the like.

[0038] Further, inFigure 3 and Figure 5 In this case, the rigidity is further improved, and the effect of preventing so-called galling damage is also improved.

[0039] Figure 6 is a schematic view of an injection molding machine 1 as a modification example of the embodiment of the present application. In Figure 6 corresponding parts of Figure 1 are denoted by the same reference numerals, and the individual description thereof will be appropriately omitted. In Figure 6 example, the injection molding machine 1 is a device that injects molten resin into a cavity formed in a mold 6, and has a hot runner manifold 3 that supplies molten resin to the cavity, and a nozzle portion 5 that communicates the hot runner manifold 3 and the cavity. The nozzle portion 5 is clamped between the hot runner manifold 3 and the mold 6. The nozzle portion 5 has a flange portion 7 that forms a tilt portion 11 that expands outward from the axis as it separates from the hot runner manifold 3 along the axis of the nozzle portion 5, and an abutting end portion 10 that abuts the mold 6 at the extension end of the tilt portion 11.

[0040] In the injection molding machine 1 of Figure 6 , the flange portion 7 is formed so as to abut the mold 6 side from the intermediate position in the axial direction of the nozzle portion 5, rather than being formed so as to abut the mold 6 side from the upper end abutting portion 9 that abuts the hot runner manifold 3 side of the nozzle portion 5. Even in this case, since the flange portion 7 is formed so as to tilt in the direction away from the hot runner manifold 3 and the nozzle portion 5, when the nozzle portion 5 is clamped between the hot runner manifold 3 and the mold 6, it is possible to prevent the flange portion 7 from deforming, and it is possible to suppress resin leakage.

[0041] The injection molding machine according to the present embodiment has the following effects.

[0042] The injection molding machine 1 of (1) is an injection molding machine 1 that injects molten resin into a cavity formed in a mold 6, and has a hot runner manifold 3 that supplies molten resin to the cavity, and a nozzle portion 5 that communicates the hot runner manifold 3 and the cavity; the nozzle portion 5 has a flange portion 7 that forms a tilt portion 11 that is clamped between the hot runner manifold 3 and the mold 6, and expands outward from the axis as it separates from the hot runner manifold 3 along the axis of the nozzle portion 5, and an abutting end portion 10 that abuts the mold 6 at the extension end of the tilt portion 11. Thereby, when the nozzle portion 5 is clamped between the hot runner manifold 3 and the mold 6, it is possible to prevent the flange portion 7 from deforming, and it is possible to suppress resin leakage.

[0043] The injection molding machine 1 of (2) is provided with a wall portion 12 standing from the flange portion 7 toward the hot runner manifold 3, and has an abutting surface 13 abutting against the hot runner manifold 3 at the upper end of the wall portion 12. Thus, deformation of the flange portion 7 can be more strongly suppressed.

[0044] In the injection molding machine 1 of (3), the nozzle portion 5 is detachable from the flange portion 7. Thus, the strength of the flange portion 7 can be improved, and the flange portion 7 can be easily replaced at the time of maintenance.

[0045] The injection molding machine 1 of (4) is provided with a heater 17 for heating the nozzle portion 5, and a through hole 19 is formed in the inclined portion 11 to lead a wiring 18 of the heater 17 out of the flange portion 7. Thus, since the wiring for the heater or the like can pass through the through hole 19, for example, the flange portion 7 can be completely positioned on the mold 6, and deformation of the flange portion 7 can be effectively suppressed.

[0046] In the injection molding machine 1 of (5), the mold 6 is formed with a recessed portion 26 having a bottom surface portion 24 and an inner side wall portion 25 to receive the abutting end portion 10, the abutting end portion 10 has a bottom surface abutting portion 27 abutting against the bottom surface portion 24 of the recessed portion 26 in the axial direction of the nozzle portion 5, and an inner side wall abutting portion 28 abutting against the inner side wall portion 25 of the recessed portion 26, the inner side wall abutting portion 28 has a recessed portion 29 forming a gap between the inner side wall portion 25. Thus, a heat insulating effect is produced between the mold 6 and the flange portion 7 by the gap formed by the recessed portion 29.

[0047] The above describes the embodiments of the present application, but the present application is not limited thereto. The detailed configuration can be appropriately changed within the scope of the gist of the present application. For example, in the above-described embodiments, the case where the inclined portion and the wall portion in the flange portion are integrated is described, but the wall portion can be separate from the inclined portion of the flange portion and then attached to the inclined portion. Even in this case, deformation of the flange portion can be more strongly suppressed.

[0048] REFERENCE NUMERALS

[0049] 1: Injection molding machine

[0050] 2: Injection nozzle

[0051] 3: Hot runner manifold

[0052] 4: Resin passage

[0053] 5: Nozzle portion

[0054] 6: Mold

[0055] 7: Flange portion

[0056] 8: Bolt

[0057] 9: upper end abutting portion

[0058] 10: abutting end portion

[0059] 11: inclined portion

[0060] 12: wall portion

[0061] 13: abutting surface

[0062] 14: resin passage

[0063] 15: pin

[0064] 16: cylinder actuator

[0065] 17: heater

[0066] 18: wiring

[0067] 19: through-hole

[0068] 20: slit portion

[0069] 21: nozzle body

[0070] 22: external thread portion

[0071] 23: internal thread portion

[0072] 24: bottom surface portion

[0073] 25: inner side wall portion

[0074] 26: recess

[0075] 27: bottom surface facing abutting surface portion

[0076] 28: inner side wall facing abutting portion

[0077] 29: recessed portion

[0078] 30: outer peripheral protruding portion

[0079] 31: fastening nut

[0080] 32: fastening bolt

[0081] 33: bolt head

[0082] 34: recessed portion

Claims

1. An injection molding machine that injects molten resin into a cavity formed on a mold, wherein, The injection molding machine has the following features: A hot runner manifold supplies molten resin to the aforementioned cavity; and, The nozzle section connects the aforementioned hot runner manifold to the aforementioned cavity; The aforementioned nozzle portion has a flange portion, which forms an inclined portion and an abutting end. The inclined portion is clamped between the aforementioned hot runner manifold and the aforementioned mold, and extends outward from the aforementioned axis along the axis of the aforementioned nozzle portion as it separates from the aforementioned hot runner manifold. The abutting end abuts against the aforementioned mold at the extended end of the aforementioned inclined portion. The aforementioned mold forms a recess, which has a bottom portion and an inner wall portion that support the aforementioned abutment end. The aforementioned abutting end has: a bottom-facing abutting surface that abuts against the bottom surface of the aforementioned recess in the axial direction of the aforementioned nozzle portion; and an inner sidewall-facing abutting portion that abuts against the inner sidewall portion of the aforementioned recess. The aforementioned inner wall opposing contact portion has a recessed portion that forms a gap between the aforementioned inner wall portions.

2. The injection molding machine according to claim 1, wherein, The injection molding machine is provided with a wall portion, which stands upright from the aforementioned flange portion toward the aforementioned hot runner manifold. The aforementioned wall portion has a contact surface at its upper end that abuts against the aforementioned hot runner manifold.

3. The injection molding machine according to claim 1, wherein, The aforementioned nozzle portion and the aforementioned flange portion are separable.

4. The injection molding machine according to claim 1, wherein, The injection molding machine includes a heater for heating the aforementioned nozzle portion, and a through hole is formed on the aforementioned inclined portion to guide the wiring of the aforementioned heater from the aforementioned flange portion.

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