KR101082745B1 - Self aligned nozzle device for hot runner injection molding - Google Patents

Abstract

The present invention relates to a nozzle apparatus of a hot runner injection mold, and more particularly, to a molten resin passing through a hot runner 12 of a manifold 10, which is formed between a fixed mold 1 and a movable mold 2. 3) is a hot runner injection mold nozzle device selectively supplied by the gate opening and closing operation of the nozzle pin by the piston-operated valve actuator, the nozzle device 20 is a socket member fixed to the manifold 10 40 and the nozzle body 30 is inserted into the fixing mold 1 and installed at the upper end thereof so as to be spherically contacted to the socket member 40 so as to be pivotable with respect to the socket member 40. It is configured to include a retainer 50 for fixing the coupling portion of the socket member 40 and the nozzle body 30.

The nozzle device of the present invention transfers the transverse deformation of the manifold 10 to the nozzle body 30 because the socket member 40 moves while the slide member is tilted with respect to the upper spherical connecting portion 34 of the nozzle body 30. By accommodating, the nozzle body 30 is prevented from being bent by the transverse deformation of the manifold.

Hot runner, injection mold, thermal expansion of manifold, bending deformation, tilting,

Description

Hot Runner Injection Mold Nozzle Device {SELF ALIGNED NOZZLE DEVICE FOR HOT RUNNER INJECTION MOLDING}

The present invention relates to a nozzle apparatus of a hot runner injection mold apparatus, and in particular, the nozzle apparatus installed in the hot runner injection mold is automatically aligned with the center line by pivoting relative to the manifold in response to lateral deformation caused by thermal expansion of the manifold. A nozzle device for preventing bending deformation.

In a conventional hot runner injection mold apparatus, a cavity is formed between a fixed mold and a movable mold, and a manifold is provided on an upper surface of the fixed mold. The manifold includes a hot runner for guiding the molten resin supplied through the sprue portion while being heated by a heating wire and maintained at a constant temperature.

A valve-opening nozzle device for selectively supplying the molten resin that has passed through the hot runner of the manifold to the cavity of the fixed mold is installed in the fixed mold. The nozzle apparatus includes a resin passage formed along the central axis direction of the nozzle body, and the upper end portion is inserted into the bottom surface of the manifold to be fixed and most of the lower body is installed in the fixing mold.

Then, heating wires are provided around the hot runner of the mad folder and the outer surface of the nozzle device, respectively, so that the molten resin passing through the hot runner and the resin passage is maintained at a temperature suitable for injection.

By the way, the upper part of the nozzle device, that is, the part connected to the manifold is largely affected by the thermal expansion of the manifold, while the amount of lateral deformation is large, whereas the part installed in the fixed mold, that is, the part adjacent to the cavity is relatively manifold. The thermal expansion of the folder is less affected. This is because the lower area of the nozzle body, such as the area around the cavity, has a relatively low temperature due to relatively low temperature due to contact with the outside air when the mold is opened.

As a result, in the state where the nozzle apparatus is vertically disposed at a predetermined distance with respect to the positioning pin, a bending deformation that inclines to one end toward the upper end occurs. That is, as the difference in thermal deformation of the upper and lower ends of the nozzle device is different, the upper end of the nozzle device is bent to one side along the deformation direction of the manifold. Such a deflection of the nozzle device causes a deflection of the nozzle pin and the nozzle body at the lower end of the nozzle device, which hinders the normal operation of the nozzle pin, as well as causing a gap between the nozzle pin and the nozzle tip gate, through the gap. There was a problem that the molten resin leaks, causing poor quality.

In addition, conventional hot runner injection molds are assembled in the order of first installing the nozzle body on the fixed mold, fixing the manifold on the mold, and then installing the nozzle pin and the valve actuator for operating the nozzle pin on the manifold. It was. According to this assembling structure, all parts are assembled separately in sequence at the site where the hot runner injection mold is installed, and thus, all parts must be supplied to the site where the injection device is installed. As a result, a skilled worker must be put into the field and assembled for each part, so that the assembly process is long and precise assembly is difficult.

Accordingly, the present invention is to solve the problem that the nozzle device is bent by the thermal expansion of the manifold in the conventional hot runner injection mold, the nozzle of the hot runner injection mold that accommodates the lateral deformation caused by the thermal expansion of the manifold to prevent bending deformation It is an object to provide a device.

In addition, an object of the present invention is to provide a nozzle device and the manifold to be assembled to the mold as an assembly to facilitate the assembly work in the field and does not require a high level of skill in the assembly.

Hot runner injection mold apparatus of the present invention for achieving the above object, the fixed mold and the movable mold to form a cavity, the fixing pin is fixed to the upper surface of the fixed mold via a medium, at least one hot runner is The formed manifold, and the upper end is in communication with the hot runner of the manifold and the outlet of the lower end is provided with a resin passage communicating with the gate of the cavity in the central axis direction, is installed along the central axis direction of the resin passage and It comprises a nozzle device having a nozzle pin for selectively opening and closing the gate portion while moving up and down by a valve actuator,

The nozzle device has a nozzle body having a spherical connection at the top, and one end is fixed to the bottom surface of the manifold, and has a spherical concave groove therein pivotably receiving the top spherical connection of the nozzle body. A socket member having a skirt portion extending outwardly along an edge of the spherical concave groove and elastically supporting an outer surface of the spherical connection portion connected to the spherical concave groove, and fitted into an outer surface of the socket member to form the socket member. It consists of a retainer that presses against.

According to the present invention, even when the manifold of the hot runner injection mold is thermally expanded while transverse deformation occurs, the deformation of the nozzle body is prevented from being transmitted to the nozzle body by the pivot connection structure between the socket member and the nozzle tip, thereby preventing bending of the nozzle body. It can prevent.

Further, according to the present invention, since the nozzle device is supplied assembled to the manifold, the assembling work with the mold is simple and easy, so that a high assembly skill is not required.

Hereinafter, a preferred embodiment of the nozzle apparatus of the hot runner injection mold apparatus according to the present invention will be described in detail according to the accompanying drawings.

1 is a cross-sectional view of an embodiment of the present invention, Figure 2 is an exploded perspective view of the nozzle device of the present invention.

Referring to FIG. 1, the hot runner injection mold apparatus of the present invention includes a stationary mold 1 and a movable mold 2, and includes a cavity 3 between the stationary mold 1 and the movable mold 2. ) Is formed.

The manifold 10 is installed on the upper surface of the fixing die 1 via the positioning pin 4. The manifold 10 includes a sprue portion 11 into which molten resin supplied from the outside is injected, at least one hot runner 12 guiding molten resin supplied through the sprue portion 11, and The molten resin passing through the inside of the hot runner 12 is provided with a plurality of heating wires 13 for supplying heat to the manifold 10 to maintain a temperature suitable for injection.

Then, the nozzle device 20 for selectively supplying the molten resin passing through the hot runner 12 to the cavity 3 is disposed on the stationary mold 1 based on the positioning pin 4 at a distance X. Installed).

1 and 2, the nozzle device 20, the resin passage 32 is formed in the central axis direction, the nozzle body 30 is provided in the installation hole of the fixing die (1), The socket member 40 is installed on the bottom surface of the manifold 10 on the same central axis as the nozzle body 30, and pivotally connects the upper end of the nozzle body 30, and the nozzle body 30 ) And a retainer 50 for fixing the engaging portion of the socket member 40.

The nozzle body 30 is provided with a spherical connecting portion 34 at the top of the socket member 40 to be pivotally connected. The socket member 40 has a spherical concave groove 41 for accommodating the upper spherical connecting portion 34 of the nozzle body 30 in a surface contact state so as to be pivotable with respect to the spherical connecting portion 34 of the nozzle body 30. Equipped.

The spherical connecting portion 34 of the nozzle body 30 is formed in an annular groove (34a) along the circumference. The groove 34a of the spherical connector 34 elastically receives the transverse deformation force due to the thermal deformation of the manifold 10. An annular O-ring 35 is inserted into the groove 34a to allow the molten resin to pass through a gap between the spherical connection portion 34 of the nozzle body 30 and the spherical concave groove 41 of the socket member 40. Seals leakage.

And the outer periphery of the nozzle body 30 is the heating wire 36 is wound to keep the molten resin at the temperature passing through the resin passage 32 inside.

1 and 2, the socket member 40 is inserted into the bottom surface of the manifold 10 in the coaxial direction with the nozzle body 30 to penetrate the side wall of the manifold 10. Skirt surrounding the spherical connecting portion 34 of the nozzle body coupled to the inner spherical concave groove 41 to form an outer wall of the spherical concave groove 41 and the upper coupling portion 42 fixed by the fixing screw 46 to be inserted The part 43 is provided. The socket member 40 has a connection passage 47 formed therein to communicate the hot runner 12 of the manifold 10 and the resin passage 32 of the nozzle body 30.

In addition, the socket member 40 includes a sealing stepped portion 48 at a boundary portion between the upper coupling portion 42 and the skirt portion 43. As shown in FIG. 3, the stepped portion 48 of the socket member 40 is pressed against the spherical connecting portion 34 of the nozzle body 30 to be coupled from the bottom, and is closely attached to the inner wall of the coupling hole. 42 serves to block and seal the molten resin that leaks through the gap between the connection passage 47 and the hot runner 12 of the manifold 10.

The retainer 50 limits the transverse deformation of the socket member 40 pivotably connected to the upper spherical connection 34 of the nozzle body 30 as shown in FIG. 1 and the top of the nozzle body 30. The socket member 40 is fixed so as not to be separated.

As shown in FIG. 2, the retainer 50 is formed in a substantially cylindrical shape, and has a threaded portion 51 on the upper outer wall thereof to be screwed into a screw hole 14 formed upward from the bottom of the manifold 10. Combined. The retainer 50 has a hole 52 formed at an upper portion thereof to accommodate the skirt portion 43 of the socket member 40, and a lower hole 54 which receives an upper end portion of the nozzle body 30 at a lower portion thereof. It is formed coaxially with the upper hole 52. The upper hole 52 of the retainer 50 has a relatively small diameter compared to the lower hole 54. Reference numeral 53, which is not described, indicates the bottom surface of the upper hole.

The lower sidewall of the retainer 50 is provided with a plurality of spring plungers 60 arranged at regular intervals along the circumference. Each spring plunger 60 penetrates the lower sidewall of the retainer 50 to elastically support the nozzle body 30 accommodated in the lower hole of the retainer 50.

In addition, the resin passage 32 of the nozzle body 30 is connected to the end of the connection passage 47 of the socket member 40 at the upper end and connected to the cavity 3 through the gate 5 at the lower end.

In addition, a nozzle pin 33 is installed along the central axis direction of the resin passage 32 of the nozzle body 30. The nozzle pin 33 extends outward from the top of the nozzle body 30 and is connected to the valve actuator 70. When the nozzle pin 33 is lowered by the operation of the valve actuator 70, the lower end blocks the gate 5 to block resin supply to the cavity 3, and conversely, when the nozzle pin 33 is raised, the lower end This gate 5 is opened and resin is supplied to the cavity 3.

Meanwhile, as shown in FIG. 4, the socket member 40, the nozzle body 30, the nozzle pin 33, and the nozzle pin actuating valve actuator 7 are assembled to the manifold 10. in a state mounted to the fixed mold (1) or is to be separated from the fixed mold (1). As a result, since the nozzle device is supplied assembled to the manifold, the assembling work with the stationary die 1 is simple and easy, and high assembly skill is not required.

Hereinafter, an operation of preventing bending deformation in response to a lateral deformation caused by thermal expansion of the manifold in the state in which the nozzle device of the present invention configured as described above is coupled to the manifold will be described with reference to FIG. 3.

In the injection molding process, the manifold 10 is heated by the heating wire 13 to be thermally expanded while being deformed in the transverse direction (← display direction). At this time, since the fixed mold 1 installed on the bottom surface of the manifold 10 is cooled by a cooling device, the amount of transverse deformation is relatively smaller than that of the manifold 10. As a result, the manifold 10 is fixed to the fixed mold 1. The transverse deformation occurs relative to.

As the manifold 10 deforms in the lateral direction, the socket member 40 of the nozzle device coupled to the bottom of the manifold 10 also moves in the lateral direction. However, since the socket member 40 is connected to the upper spherical connector 34 of the nozzle body 30 in a ball joint manner, the socket member 40 slides along the outer surface of the upper spherical connector 34 of the nozzle body.

At this time, the rear side wall 43a of the skirt portion 43 of the socket member 40 located rearward with respect to the deformation direction (← display direction) due to thermal expansion of the manifold is connected to the spherical connection portion 34 of the nozzle body located inside. It is blocked by the outer surface and is subjected to deformation that extends radially outward. The skirt portion of the socket member is also limited so that the outer surface thereof is blocked by the inner wall of the retainer 50 so as not to be deformed more than a predetermined amount.

Therefore, since the socket member 40 moves while slide tilting with respect to the upper spherical connecting portion 34 of the nozzle body 30, the nozzle body is accommodated by accommodating the lateral deformation of the manifold 10 without transmitting it to the nozzle body 30. The 30 is prevented from being bent by the transverse deformation of the manifold.

In addition, as the manifold 10 is deformed in the lateral direction, the deformation force F2 is applied in the lateral direction (← display direction) to the upper end of the retainer 50 which is screwed to the bottom of the manifold 10. . The retainer 50 is deformed in the transverse direction (← direction) by the deformation force F2, but the upper end of the nozzle body 30 is always kept in a constant position because of the elastic restoring force of the spring plunger 60 coupled to the lower end. Will let you.

On the other hand, when the retainer 50 is rotated so that the retainer 50 moves further upward in a state where the retainer 50 is screwed to the manifold 10, the socket member 40 is formed by the upper spherical connecting portion 34 of the nozzle body 30. By pressing upwardly, the stepped portion 48 is in close contact with the upper surface of the screw hole 14 of the manifold 10 so that the connection passage 47 of the upper coupling portion 42 and the hot runner 12 of the manifold 10 are provided. Seal and seal the molten resin that leaks through the gap between

1 is a cross-sectional view of the combination of the hot runner injection mold apparatus according to the present invention,

Figure 2 is an exploded perspective view showing a separate nozzle device in the hot runner injection mold apparatus according to the present invention,

3 is an enlarged cross-sectional view of a main part of the combined cross-sectional view of FIG. 1.

Figure 4 is a state diagram used in the state before the nozzle apparatus of the present invention is installed in the mold.

[Description of Drawings]

1: fixed mold 2: movable mold

3: cavity 4: positioning pin

5: gate 10: manifold

11: sprue 12: hot runner

13: heating cable 14: screw hole

20: nozzle device

30: nozzle body 32: resin passage

33: nozzle pin 34: spherical connection

34a: Groove 35: O-ring

36: electric wire

40: socket member 41: spherical concave groove

42: upper coupling portion 43: skirt portion

46: set screw 47: connecting passage

48: step

50: retainer 51: screw portion

52: hole 53: bottom

54: lower hole 60: spring plunger

70: valve actuator

Claims (6)

The piston acts on the cavity 3 formed between the fixed mold 1 and the movable mold 2 through the molten resin passing through the hot runner 12 of the manifold 10 maintained at a high temperature by the heating wire 13. In the nozzle apparatus 20 of the hot runner injection mold which selectively supplies by the gate opening / closing operation | movement of the nozzle pin 33 by the type | mold valve actuator 70, The nozzle device 20 is a socket member 40 which is inserted and detachably inserted inwardly from the bottom of the manifold 10 and the socket member 40 is pivotally pivotable with respect to the socket member 40. Nozzle of the hot runner injection mold, characterized in that it comprises a nozzle body 30 is coupled to the spherical contact 40 and a retainer 50 for fixing the coupling portion of the socket member 40 and the nozzle body 30 Device. The method of claim 1, The nozzle body 30 may include a resin passage 32 formed in a central axis direction so as to communicate the cavity 3 and the hot runner 12 of the manifold 10, and a spherical connection portion integrally formed at an upper end thereof. 34) The socket member 40 has a skirt portion 42 having a spherical concave groove 41 for receiving the spherical contact portion 34 of the nozzle body 30 in a spherical contact manner therein, and the nozzle body therein. A connection passage 47 for communicating the resin passage 32 and the hot runner 12 with each other, The retainer 50 fixes the skirt portion 42 of the socket member 40 and the upper end of the nozzle body 30 into a hole in the central axial direction, and forms a screw portion 51 on the upper outer wall to form the manifold. Hot runner injection mold nozzle device characterized in that the screw coupling to the screw hole (14) of the folder (10). The plurality of spring plungers (60) according to claim 2, wherein the plurality of spring plungers (60) elastically support the nozzle body (30) so that the upper end portion of the nozzle body (30) accommodated therein penetrates the side wall of the retainer (50) and is disposed on a central axis. Hot runner injection mold nozzle device characterized in that it further comprises). The hot runner according to claim 2, wherein the surface of the spherical concave groove 41 of the socket member 40 has a surface hardness relatively lower than that of the spherical connecting portion 34 of the nozzle body 30. Nozzle apparatus of injection mold. The method of claim 3, In the spherical connecting portion 34 of the nozzle body 30, a groove 34a is formed in an annular shape along the circumference to flexibly accommodate the external force due to thermal deformation applied to the nozzle body 30, and in the groove 34a An annular O-ring 35 is inserted to seal the leakage of molten resin through a gap between the spherical connection portion 34 of the nozzle body 30 and the spherical concave groove 41 of the socket member 40. The nozzle apparatus of the hot runner injection mold, characterized in that. The method of claim 1, The socket member 40, the nozzle body 30, the nozzle pin 33, and the nozzle pin actuating valve actuator 7 are assembled to the fixing mold 1 in an assembly state assembled to the manifold 10. Or a nozzle apparatus of a hot runner injection mold, characterized in that configured to be separated from the fixed mold (1).

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