KR20150112882A - Mold for injection molding - Google Patents

Abstract

A purpose of the present invention is to have simplified and minimized structure, and to improve reliability of a movement in a driving unit of a mold for injection molding. A mold for injection molding of the present invention comprises: a spool (19), in which a melted resin (300) is supplied from a resin supply unit (100); a manifold (18) which is disposed inside a fixed frame (3), and has a flowing path (21), wherein the melted resin is injected from the spool and flows; a plurality of nozzles (20) which respectively have a gate (23a) ejecting the melted resin flowing in the flowing path toward a cavity (5); a plurality of gate opening and closing pins (17) which open and close the gate by being moved in an axis direction; a driving unit (11) which is supported on an outer end portion of the fixed frame by moving the gate opening and closing pins in an axis direction. The driving unit of the mold for injection molding in the present invention is driven by a driving source (200) disposed more outwardly than outer surfaces of the fixed frame. Furthermore, driving power of the driving unit is transferred to a plurality of gate opening and closing pins so that the gate opening and closing pins are moved in the axis direction.

Description

[0001] MOLD FOR INJECTION MOLDING [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a mold for injection molding which forms a cavity filled with a molten resin by abutting against each other, and more particularly to a mold for injection molding having a fixed mold and a movable mold, The present invention relates to a molding die for injection molding.

There is known a mold for injection molding in which a cavity, which is a space formed by a combination of a concave mold (concave portion) and a convex mold (convex portion) having a fixed mold and a movable mold, is filled with a molten resin to form a molded product. Such a mold for injection molding is attached to an injection molding machine as a part of the structure.

Such a mold for injection molding is provided with a structure called a hot runner system in which a molten resin is heated by a heater and flows toward the cavity (see, for example, Patent Document 1 and Patent Document 2 Reference). The hot runner system includes a spool to which a molten resin is supplied from a resin supply portion of an injection molding machine, a manifold to which the molten resin flows from the spool, and a plurality of nozzles to which the molten resin is supplied from the manifold, A pair of openings are respectively formed as gates, and the molten resin is discharged from the respective gates into the cavities and charged.

A plurality of gate opening / closing pins for opening and closing the gates of the respective nozzles are disposed in the mold for injection molding so as to be movable in the axial direction. As the gate opening / closing pin is moved to one side, the gate is closed and the discharge of the molten resin is stopped And the gate opening / closing pin is moved to the other side, whereby the gate is opened and the discharge from the molten resin to the cavity is performed.

In the injection molding die disclosed in Patent Document 1, a hot runner system having a spool, a manifold, and a plurality of nozzles is disposed inside the movable mold. A plate (extrusion plate) for moving each gate opening / closing pin and a gate opening / closing pin is also disposed in the inside of the movable mold, and a gate opening / closing pin is inserted into each nozzle so as to be movable in the axial direction, Once attached to the plate. The gate opening / closing pin is moved in the axial direction by the ejector rod provided with the plate as the driving portion, so that each gate opening / closing pin is moved in the axial direction integrally with the plate.

In the injection molding die disclosed in Patent Document 2, a hot runner system having a spool, a manifold, and a plurality of nozzles is disposed inside the stationary mold. A plate (pin plate) for moving each gate opening / closing pin and a gate opening / closing pin is also disposed inside the stationary mold, and a gate opening / closing pin is inserted into each nozzle so as to be movable in the axial direction, And one end is coupled to the plate. A driving part for moving the gate opening / closing pin is disposed in the fixed mold, together with a hot runner system, and a cylinder for supporting the piston and the piston is provided as a driving part. The piston and the cylinder are arranged outside a plurality of gate opening / closing pins in a direction orthogonal to the axial direction of the gate opening / closing pin. The plurality of gate opening / closing pins are moved in the axial direction integrally with the plate by moving the plate in the axial direction of the gate opening / closing pin by the piston.

Japanese Patent Application Laid-Open No. 2010-234541 Japanese Patent Application Laid-Open No. 2002-96359

However, in the injection molding die disclosed in Patent Document 1, since the plate and the gate opening / closing pin are disposed together with the hot runner system in the movable mold moving with respect to the fixed mold, when the movable mold is moved, The system, the plate, and the gate opening / closing pin are moved with the movement of the movable mold, which hinders simplification of the entire structure of the mold for injection molding. In addition, since the hot runner system, the plate, and the like are also moved together with the movable mold, the weight of the structure of the movable mold is large, and a large driving force for moving the mold is required.

On the other hand, in the injection molding die disclosed in Patent Document 2, the entire structure of the injection molding die can be simplified because the hot runner system, the plate, and the like are disposed inside the fixed die. However, And a driving unit having a piston and a cylinder is disposed inside. Therefore, since the driving part is disposed inside the fixed mold, the mold for injection molding becomes large, which hinders miniaturization of the injection mold.

In the injection molding die in which the piston and the cylinder are provided as the driving section, the piston and the cylinder are arranged in the axial direction of each gate opening / closing pin, and each piston presses the gate opening / closing pin from the axial direction, And the gate opening / closing pin is moved to the other side by releasing the pressure on the gate opening / closing pin of each piston.

In the injection molding die in which the piston and the cylinder are arranged in the axial direction of the respective gate opening and closing pins, one gate opening / closing pin is located inside the outer diameter of each cylinder, There is a possibility that the pitch between the gate opening / closing pins increases due to the distance (pitch) depending on the size of the outer diameter of the cylinder, which may hinder miniaturization of the injection mold.

In the injection molding die in which the driving part is disposed inside the fixed mold together with the hot runner system, the influence of heat generated in the hot runner system to the driving part is generated, so that the operation of the driving part may be defective It may be necessary to provide a heat interrupter or a cooling mechanism for the driving part.

SUMMARY OF THE INVENTION The present invention has been made in order to overcome the above problems, and it is an object of the present invention to provide a mold for injection molding which can simplify and miniaturize the structure and improve the reliability of the operation in the driving unit.

A mold for injection molding according to one aspect of the present invention is a mold for injection molding having a fixed mold and a movable mold for forming a cavity in which a molten resin is filled by being abutted against each other, A manifold having a flow path through which the molten resin supplied from the spool flows, a plurality of nozzles each having a gate for discharging the molten resin flowing by the flow path toward the cavity, And a plurality of gate opening / closing pins that are moved in the axial direction to open and close the gates, respectively, wherein the injection molding die includes at least one driving part supported on an outer end of the stationary mold, Wherein the driving unit is driven by an external driving source of the stationary mold, This driving force will be transmitted to the plurality of opening and closing the gate pin is moved in the said axial direction, the plurality of opening and closing the gate pin.

As a result, the driving force of the driving portion driven by the driving source disposed outside the outer surface of the stationary mold is transmitted to the plurality of gate opening / closing pins, the plurality of gate opening / closing pins are moved in the axial direction, It is opened and closed by a pin.

The mold for injection molding according to one aspect of the present invention further includes an ejector pin provided on the movable mold so as to be movable in the axial direction so as to protrude the molded product molded in the cavity and to take the molded product out of the cavity .

As a result, the ejector pin and the gate opening / closing pin are separated from each other in the movable mold and the fixed mold.

In the mold for injection molding according to one aspect of the present invention, the stationary mold further includes a valve driving plate disposed movably in the axial direction of the gate opening / closing pin according to the operation of the driving unit, The gate opening / closing pin may be provided as a gate opening / closing part for opening and closing the gate at one end in the axial direction and as a coupling part for the other end in the axial direction coupled to the valve driving plate.

As a result, the plurality of gate opening / closing pins are simultaneously moved by the valve driving plate.

In the above-described mold for injection molding according to one aspect of the present invention, the fixed mold further includes a plurality of guide shafts movably supporting the valve driving plate in the axial direction, It is preferably arranged on the outside of the fold.

As a result, the distance between the guide shafts becomes longer, and the inclination of the valve driving plate is suppressed.

In the injection molding die according to one aspect of the present invention, a plurality of the driving portions are provided, and the plurality of driving portions are arranged on the axis extending in the moving direction of the valve driving plate through the central portion of the valve driving plate It is preferable that they are located at regular intervals in the circumferential direction.

As a result, an even drive force is easily transmitted from the drive unit on the basis of the central portion of the valve drive plate, and the gate opening / closing pin is moved in the axial direction with the tilt of the valve drive plate being suppressed.

The mold for injection molding according to one aspect of the present invention is characterized in that a plurality of the driving portions are provided and the plurality of driving portions are arranged on an axis extending in the moving direction of the valve driving plate through a central portion of the valve driving plate Are preferably equidistantly positioned in the radial direction.

This makes it easier for the drive force to be transmitted from the drive unit to the valve drive plate with respect to the central portion as a reference, and moves the gate opening / closing pin in the axial direction with the tilt of the valve drive plate being suppressed.

In the mold for injection molding according to one aspect of the present invention, there is one drive unit, the fixed mold is provided between the driving unit and the valve driving plate so as to be movable in the same direction as the valve driving plate, And a rotating body rotatably supported on the valve driving plate so as to be rotatable about a fulcrum axis extending in a direction orthogonal to the axial direction of the gate opening / closing pin, wherein the action plate And the driving force of the driving unit is transmitted from the acting plate to the valve driving plate through the rotating body while facing the outer circumferential surface of the rotating body while facing the valve driving plate.

Thus, even if there is one driver, the gate opening / closing pin is moved in the axial direction with the tilt of the valve driving plate being suppressed.

In the mold for injection molding according to one aspect of the present invention, one drive unit is provided, and the stationary mold is movable between the drive unit and the valve drive plate in the same direction as the valve drive plate Further comprising a transfer protrusion portion having a curved surface portion which is in contact with the other of the action plate and the valve drive plate on the side opposite to the one of the action plate and the valve drive plate to which the driving force of the drive portion is transmitted, And is transmitted to the valve driving plate through the transfer protrusion.

Thus, even if there is only one driver, the gate opening / closing pin is moved in the axial direction in a state in which the inclination of the valve driving plate is suppressed.

According to the present invention, the driving unit is driven by the driving source disposed outside the stationary mold, the driving force of the driving unit is transmitted to the plurality of gate opening / closing pins disposed in the stationary mold, and the plurality of gate opening / And the gate of each nozzle is opened and closed by the gate opening / closing pin, so that the structure can be simplified and miniaturized, and at the same time, the operation reliability in the driving section can be improved.

BRIEF DESCRIPTION OF DRAWINGS FIG. 1 shows an embodiment of the present invention, which is a cross-sectional view of a mold for injection molding shown in a state in which a fixed mold and a movable mold are spaced apart.
Fig. 2 is a sectional view showing a state in which the fixed mold is moved and held in contact with the movable mold, showing the operation of the injection-molding mold according to one embodiment.
Fig. 3 is a sectional view showing a state in which the cavity is filled with the molten resin, following Fig. 2;
4 is a cross-sectional view showing a state in which the gate is closed by the gate opening / closing pin, following FIG. 3;
5 is a cross-sectional view showing the first modification.
6 is an enlarged cross-sectional view virtually showing a state in which the action plate is inclined in the first modification.
7 is an enlarged sectional view showing the second modification.
8 is an enlarged cross-sectional view virtually showing a state in which the action plate is inclined in the second modification.
9 is an enlarged cross-sectional view showing an example in which a concave surface is formed in the valve driving plate in the second modification.
10 is an enlarged cross-sectional view showing an example in which a transfer projection is provided on the valve driving plate in the second modification.
11 is an enlarged cross-sectional view showing an example in which a convex surface is formed on the action plate and the transfer projection is provided on the valve driving plate in the second modification.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments for carrying out the injection molding die of the present invention will be described with reference to the accompanying drawings.

In the following description, the direction in which the stationary mold and the movable mold of the injection molding die are separated from each other is the vertical direction, and the vertical and horizontal directions. Note that the vertical and horizontal directions as well as the left and right directions shown below are shown for convenience of explanation, and the present invention is not limited to such a direction. The number, shape, arrangement, and the like of each component are not limited to the contents shown within the scope of not deviating from the intention of the present invention.

≪ Structure of Injection Molding Die &

First, the structure of the injection-molding die 1 will be described (see Fig. 1).

The injection-molding mold 1 has a movable mold 2 and a stationary mold 3 which are assembled in the injection molding machine as a part of the structure and are separated from each other in the up-and-down direction. An inner space is formed in the stationary mold 3, and this inner space is used as an arrangement space 4. [ A recess 3a opened downward is formed in the lower end of the stationary mold 3. The concave portion 3a is formed so as to be spaced apart in the horizontal direction.

The movable mold 2 is moved upward and downward with respect to the fixed mold 3 and separated. The movable mold 2 is formed in a substantially flat plate shape in the thickness direction in the up and down direction and is assembled with the recess 3a formed in the fixed mold 3 when the fixed mold 3 is brought into contact with the upper face side, 5 formed on the surface of the substrate. The convex portions 2a are formed so as to be spaced apart in the horizontal direction.

The movable mold 2 has insertion through holes 2b communicating with the convex portions 2a respectively. The insertion through hole 2b extends vertically and the ejector pin 6 is supported in the insertion through hole 2b so as to be movable in the up and down direction. In the state before the cavity 5 is filled with a molten resin to be described later, the upper surface of the ejector pin 6 is aligned with the upper surface of the convex portion 2a.

The fixed mold 3 has a plate-like mounting plate 7 which is vertically oriented, a cavity plate 8 positioned below the mounting plate 7, a peripheral portion of the mounting plate 7 and a cavity plate 8 And a connecting plate 9 for connecting the outer circumferential portion of the connecting plate 9. The placement space 4 is formed inside the stationary mold 3 by the mounting plate 7, the connecting plate 9 and the cavity plate 8.

At the center of the mounting plate 7, there is formed a nozzle inserting hole 7a penetrating vertically. On the mounting plate 7, for example, two support holes 7b are vertically formed on the outer side of the nozzle insertion hole 7a so as to be spaced apart from each other. On the mounting plate 7, for example, two guide mounting holes 7c open downward are formed on the outside of the support hole 7b so as to be spaced laterally.

An annular locating ring 10 is provided on the upper surface of the mounting plate 7 and the center hole 10a of the locating ring 10 coincides with the nozzle inserting hole 7a. The locating ring 10 has a function of positioning with respect to the injection molding machine when assembled into an injection molding machine.

The nozzle insertion hole 7a of the mounting plate 7 is inserted with a supply nozzle 100 serving as a resin supply portion for supplying molten resin. A driving rod 11, which functions as a driving portion, is supported in the supporting hole 7b of the mounting plate 7 so as to be movable in the vertical direction. Since the mounting plate 7 is located at the outer end of the stationary mold 3, the drive rod 11 serving as the drive unit is also located at the outer end of the stationary mold 3.

The driving rod 11 is driven by the driving source 200 disposed on the upper side of the stationary mold 3, that is, on the outer side of the outer surface of the stationary mold 3, and is moved up and down with respect to the mounting plate 7 .

As the driving source 200, for example, a piston or an electric motor, which is moved by a pneumatic or hydraulic pressure, is used for the cylinder and the cylinder.

The cavity plate 8 is provided with an arrangement hole 8a passing through the upper and lower portions thereof. The arrangement hole 8a has a lower opening smaller than the upper opening. For example, two guide mounting holes 8b are formed in the cavity plate 8 so as to be spaced from each other in the left and right directions.

The guide shaft 12 is disposed outside the manifold 18 in the arrangement space 4 of the stationary mold 3. The guide shaft 12 is inserted into the guide mounting hole 7c formed in the mounting plate 7 and the guide mounting hole 8b formed in the cavity plate 8 so that both ends of the guide shaft 12 are coupled to each other.

On the guide shaft 12, a vertically-directed valve driving plate 13 is supported so as to be vertically movable.

The valve driving plate 13 has a spool insertion through hole 13a vertically penetrating the center portion and the spool insertion through hole 13a is located directly below the nozzle insertion hole 7a of the mounting plate 7. [ On the outer peripheral portion of the valve driving plate 13, a supported hole 13b penetrating upward and downward is formed so as to be spaced laterally. The valve driving plate 13 is constituted by, for example, a first engaging plate 14 and a second engaging plate 15 joined up and down.

The valve drive plate 13 is supported at the upper end side of the guide shaft 12 by inserting the guide shaft 12 into the supported hole 13b. A compression coil spring 16 is supported on the guide shaft 12 below the valve driving plate 13. Therefore, the valve driving plate 13 is biased upward by the compression coil spring 16, and the biasing force of the compression coil spring 16 is applied to the mounting plate 7 As shown in Fig.

The driving force of the driving rod 11 is transmitted to the valve driving plate 13. The driving rod 11 is disposed at equal intervals in the circumferential direction around the axis S extending in the moving direction of the valve driving plate 13 through the central portion of the valve driving plate 13. Specifically, when there are two drive rods 11, they are spaced 180 degrees apart in the circumferential direction. In addition, three or more driving rods 11 may be provided, and in this case, it is preferable that the plurality of driving rods 11 are equally spaced in the circumferential direction. In this case, it is preferable that the driving rod 11 is supported at a position close to the center of the mounting plate 7. [

The gate opening / closing pins 17 are coupled to the valve driving plate 13 in a state where they are spaced apart in the horizontal direction. The gate opening / closing pin 17 is provided with an upper end as a coupling portion 17a and a lower end as a gate opening and closing portion 17b. The gate opening and closing pin 17 is engaged with the engaging portion 17a disposed inside the valve driving plate 13 and the portion other than the engaging portion 17a protrudes downward from the valve driving plate 13 .

A manifold 18, a spool 19, and a nozzle 20, which constitute a hot runner system, are disposed in the arrangement space 4 of the stationary mold 3.

The manifold 18 is formed in a flat shape having a reduced thickness in the vertical direction and is positioned between the guide shafts 12. A flow path 21 through which the molten resin flows is formed in the manifold 18. The flow path 21 has an intermediate portion 21a located at the central portion in the vertical direction and an upper portion 21a located at the upper portion of the intermediate portion 21a And a branched portion 21c positioned below the intermediate portion 21a.

The intermediate portion 21a is formed as a space having a larger width in the horizontal direction as compared with the width in the vertical direction.

The inlet 21b is formed in the central portion of the manifold 18 and has an upper opening on the upper surface of the manifold 18 and a lower opening communicating with the middle portion of the intermediate portion 21a.

The branch portion 21c is formed so as to be spaced apart in the horizontal direction and is formed in the same number as the gate opening / closing pin 17. The diameter of the branched portion 21c is slightly larger than the diameter of the gate opening / closing pin 17. The branched portion 21c has an upper opening communicating with the intermediate portion 21a and a lower opening opened to the lower surface of the manifold 18. [

The manifold 18 is formed with a pin support hole 18a penetrating vertically. The pin support hole 18a is formed in the same number as the gate opening / closing pin 17, and is positioned directly above the gate 23a.

The manifold 18 is provided on the upper surface of the cavity plate 8 via an annular spacer 22, for example.

The spool 19 is formed in a cylindrical shape extending vertically, and an internal space is formed as the resin inflow passage 19a. The spool 19 is coupled to the upper surface of the central portion of the manifold 18 and the resin inflow passage 19a communicates with the inflow portion 21b of the manifold 18. [ The spool 19 is inserted into the spool insertion hole 13a of the valve driving plate 13 and the upper end thereof is inserted into the nozzle insertion hole 7a of the mounting plate 7. [ The supply nozzle 100 inserted into the nozzle insertion hole 7a is engaged with the spool 19.

The nozzles 20 are arranged so as to be spaced apart from each other in the horizontal direction, and are provided in the same number as the gate opening / The nozzle 20 is formed by a tubular portion 20a extending vertically and a flange portion 20b projecting outwardly in the horizontal direction from the upper end of the tubular portion 20a. The tubular portion 20a of the nozzle 20 is inserted into the arrangement hole 8a of the cavity plate 8 from above and the flange portion 20b is located on the upper side of the cavity plate 8. [

The nozzle 20 is provided with a flow passage 23 penetrating upward and downward. The flow path 23 is formed as a gate 23a whose lower end portion is smaller in diameter than other portions, so that the molten resin introduced from the spool 19 is discharged toward the cavity 5. [ The gate 23a is positioned substantially coincident with the lower opening of the arrangement hole 8a. The diameter of the flow path 23 is slightly larger than the diameter of the gate opening / closing pin 17 except for the gate 23a. The diameter of the gate 23a is substantially equal to the diameter of the gate opening / closing pin 17. [

The nozzles 20 are respectively coupled to the lower surface of the manifold 18 and the flow paths 23 communicate with the branched portions 21c of the manifolds 18 respectively.

A heater 24 is disposed around the tubular portion 20a of the nozzle 20 and the heater 24 is disposed in the arrangement hole 8a of the cavity plate 8, The nozzles 20 are heated by the heater 24 to prevent solidification due to cooling of the molten resin flowing through the flow path 23.

The manifold 18 and the spool 19 are also heated by a heater not shown so that the flow path 21 of the manifold 18 and the resin inflow path 19a of the spool 19 flow The solidification due to the cooling of the molten resin is prevented.

The gate opening and closing pin 17 is inserted into the pin support hole 18a of the manifold 18 and is supported on the manifold 18 so as to be movable in the up and down direction. The gate opening and closing pin 17 is inserted into the flow path 23 of the manifold 18 and the nozzle 20 in a state in which the pin support hole 18a is inserted. The diameter of the gate opening / closing pin 17 is smaller than the diameter of the flow path 23, so that a space is formed in the flow path 23 for the molten resin to flow on the outer peripheral side of the gate opening and closing pin 17.

≪ Operation in Injection Molding >

Next, the operation when the molded article is formed in the injection molding die 1 will be described (see Figs. 2 to 4).

The movable mold 2 is moved upward with respect to the fixed mold 3 and the movable mold 2 is brought into contact with the fixed mold 3 in the injection molding die 1, The cavity 5 is formed by the recess 2a formed in the stationary mold 3 and the recess 3a formed in the stationary mold 3 (see Fig. 2). At this time, the valve driving plate 13 is pressed downward by the compression coil spring 16 toward the mounting plate 7 so that the gate opening / closing pin 17 is located at the moving end at the upper side and the gate opening / closing portion 17b Are located on the upper side of the gate 23a of the nozzle 20, respectively. Therefore, the gate 23a is opened.

The molten resin 300 is supplied to the spool 19 from the supply nozzle 100 when the movable mold 2 is brought into contact with the stationary mold 3 and the cavity 5 is formed. The molten resin 300 supplied to the spool 19 flows from the resin inflow passage 19a to the flow passage 21 of the manifold 18 and is branched by the branching section 21c, (23). At this time, the molten resin 300 flows in the space on the outer peripheral side of the gate opening / closing pin 17 in the branching section 21c and the flow path 23. The manifold 18 and the nozzle 20 are moved by the heater 24 or the like when the molten resin 300 flows from the spool 19 to the nozzle 20 via the manifold 18. [ So that solidification due to cooling of the molten resin 300 is prevented.

The molten resin 300 flows from the gate 23a of the flow path 23 to the cavity 5 and the cavity 5 is filled with the molten resin 300.

When the molten resin 300 is filled in the cavity 5, the driving rod 11 is moved downward by the driving source 200 and the valve driving plate 13 is pressed against the driving rod 11, The gate opening and closing pin 17 is moved downward with the movement of the valve driving plate 13 so that the gate opening and closing part 17b moves the gate of the nozzle 20 (See Fig. 4). Therefore, the discharge of the molten resin 300 from the nozzle 20 to the cavity 5 is stopped.

At this time, the valve driving plate 13 is guided and moved by the guide shaft 12 disposed outside the manifold 18.

At this time, since the guide shaft 12 is disposed outside the manifold 18 in the direction perpendicular to the moving direction of the valve driving plate 13, the distance of the guide shaft 12 The inclination of the valve driving plate 13 is suppressed and the valve driving plate 13 is moved in a stable state and the operation of the valve driving plate 13 and the gate opening and closing pin 17 is facilitated .

In addition, as described above, the drive rods 11 are located at regular intervals in the circumferential direction about the axis S.

Therefore, evenly driving force is easily transmitted from the driving rod 11 to the valve driving plate 13 with the center portion as a reference, and the gate opening / closing pin 17 is moved in the state in which the inclination of the valve driving plate 13 is suppressed The operation of the gate opening / closing pin 17 can be facilitated and the opening / closing operation of the gate 23a of the gate opening / closing pin 17 with high accuracy can be ensured.

Further, as described above, the drive rods 11 are positioned at regular intervals in the radial direction with respect to the axis S.

Therefore, evenly driving force is easily transmitted from the driving rod 11 to the valve driving plate 13 with the center portion as a reference, and the gate opening / closing pin 17 is moved in a state where the inclination of the valve driving plate 13 is suppressed The operation of the gate opening / closing pin 17 can be further facilitated and a more accurate opening and closing operation of the gate 23a of the gate opening / closing pin 17 can be ensured.

As described above, when the discharge of the molten resin 300 into the cavity 5 is stopped, the molten resin 300 filled in the cavity 5 is cooled and solidified.

When the molten resin 300 filled in the cavity 5 is cooled and solidified, the movable mold 2 is moved downward to be separated from the fixed mold 3, and the molten resin 300 solidified by the ejector pin 6 And the solidified molten resin 300 is taken out of the cavity 5 as a molded article 400, respectively.

≪ Modification of Injection Molding Mold >

Next, modified examples of the injection mold 1 will be described (see Figs. 5 to 11).

Further, in each variation shown below, the action plate is disposed between the driving rod and the valve driving plate, and the driving force of the driving rod is transmitted to the valve driving plate through the action plate . Therefore, only the parts different from the above-described configuration will be described in detail with respect to the following modified examples, and the remaining parts are given the same reference numerals as those given to the same parts in the above-described configuration, and a description thereof will be omitted.

The first modification is an example in which the action plate 25 and the rotating body 26 are provided and one drive rod 11 is movably supported by the mount plate 7 (see FIG. 5).

The action plate 25 is located between the drive rod 11 and the valve drive plate 13 in the arrangement space 4 of the stationary mold 3. The action plate 25 is formed in a flat plate shape facing up and down and is movably supported by the guide shaft 12 and is pressed by the drive rod 11 when the drive rod 11 is moved downward. An insertion hole (not shown) through which the spool 19 is inserted is formed at the center of the action plate 25.

The rotating body 26 is located on the opposite side in the front-rear direction with the central portion of the valve driving plate 13 therebetween, for example, and is rotatably supported by the valve driving plate 13. [ As the rotating body 26, for example, a bearing is used. The rotating body 26 has a rotary part 28 which is rotated around the point shaft 27 and the point shaft 27 extending in the horizontal direction and has a circular outer circumference.

The rotary body 26 is connected to the valve drive plate 13 and the rotary part 28 is rotated with respect to the valve drive plate 13 with the point shaft 27 as a fulcrum.

The outer peripheral surface 28a of the rotary part 28 is in contact with the action plate 25 from above. The driving force of the driving rod 11 is transmitted from the action plate 25 to the rotating body 28 and from the rotating body 28 to the valve driving plate 13.

When the driving rod 11 is moved downward by the driving source 200, the action plate 25 is pressed by the driving rod 11 and moved downward. At this time, since a portion other than the central portion of the action plate 25 is pressed against the drive rod 11, a force in a direction tilting to the horizontal direction is generated in the action plate 25, The rotating portion 28 is rotated about the fulcrum shaft 27 by the force in the tilting direction (see Fig. 6). 6, the operation plate 25 is virtually shown to be inclined with respect to the horizontal direction in order to facilitate understanding of the description.

The driving force of the driving rod 11 is transmitted to the fulcrum shaft 27 of the rotating body 26 via the action plate 25 and the force which is directly below the fulcrum axis 27 is transmitted to the fulcrum shaft 27 To the valve driving plate 13, so that the valve driving plate 13 is moved in a state in which the inclination of the valve driving plate 13 is suppressed in the horizontal direction.

By providing the driving force of the driving rod 11 to the valve driving plate 13 through the action plate 25 and the rotating body 26 in the configuration in which one driving rod 11 is installed as described above, The gate opening and closing pin 17 is moved in the axial direction in a state where the tilting of the plate 13 is suppressed so that the operation of the gate opening and closing pin 17 is facilitated and the accuracy of the gate 23a of the gate opening and closing pin 17 It is possible to secure the opening and closing operation of the door.

The second modification is an example in which the action plate 29 is provided and one drive rod 11 is movably supported on the mount plate 7 (see FIG. 7).

The action plate 29 is located between the drive rod 11 and the valve drive plate 13 in the arrangement space 4 of the stationary mold 3. The action plate 29 has a flat portion 30 formed in a vertically oriented flat plate shape and a transmission projection portion 31 protruding downward from the flat portion 30. The distal end faces of the transmission projection portions 31 are formed as curved surfaces (31a). The transmitting projection 31 is located on the opposite side in the front-rear direction, for example, with the central portion of the plane portion 30 therebetween.

The action plate 29 is supported by the guide shaft 12 such that the plane portion 30 is movably supported by the drive rod 11 when the drive rod 11 is moved downward. At the center of the flat surface portion 30, an insertion hole (not shown) through which the spool 19 is inserted is formed.

The curved surface portion 31a of the transmitting projection 31 abuts against the valve driving plate 13 from above. Thus, the driving force of the driving rod 11 is transmitted from the action plate 29 to the valve driving plate 13.

When the drive rod 11 is moved downward by the drive source 200, the action plate 29 is pressed by the drive rod 11 and moved downward. At this time, since a portion other than the central portion of the action plate 29 is pressed against the drive rod 11, a force in a direction tilting to the horizontal direction is generated on the action plate 29, The transmitting projection 31 is slid with respect to the upper surface of the valve driving plate 13 by the force in the tilting direction (see Fig. 8). In addition, in Fig. 8, in order to facilitate understanding of the explanation, the operation plate 29 is virtually shown to be inclined with respect to the horizontal direction.

The driving force of the driving rod 11 is transmitted to the transmitting projection 31 of the action plate 29 and the force of the force which is transmitted directly below the transmitting projection 31 is transmitted from the transmitting projection 31 to the valve driving plate 13 And the valve driving plate 13 is moved in a state in which the valve driving plate 13 is restrained from tilting with respect to the horizontal direction.

By providing the driving force of the driving rod 11 to the valve driving plate 13 via the transmitting projection 31 of the action plate 29 in the configuration in which one driving rod 11 is installed as described above, The gate opening / closing pin 17 is moved in the axial direction with the tilt of the plate 13 being suppressed so that the operation of the gate opening / closing pin 17 is enabled and the accuracy of the gate 23a of the gate opening / It is possible to secure the opening and closing operation of the door.

9 shows an example in which the transmitting projection 31 is in contact with the upper surface of the valve driving plate 13 in the second modification. However, as shown in Fig. 9, It is also possible to form the concave surface 13c of the transfer protrusion 31 so as to contact the concave surface 13c.

The concaved surface 13c is formed in the valve driving plate 13 and the transmitting projection 31 is brought into contact with the concave surface 13c of the valve driving plate 13, The distance of the injection mold 29 is shortened, and the mold for injection molding 1 can be miniaturized.

10 shows a case in which the transfer projection 32 is provided in the valve drive plate 13 and the transfer projection 32 is provided in the valve drive plate 13 as shown in Fig. The curved surface portion 32a of the operating plate 32 may be in contact with the lower surface of the action plate 29. In this case, the driving force of the drive rod 11 is transmitted from the action plate 29 to the valve drive plate 13 having the transfer protruding portion 32.

A curved concave surface 29a is formed in the action plate 29 when the transfer projection 32 is provided on the valve driving plate 13 and the transfer projection 32 is formed on the concave surface 29a (See FIG. 11). Even in this case, the distance between the valve drive plate 13 and the action plate 29 is shortened, so that the size of the injection-molding mold 1 can be reduced.

<Summary>

As described above, in the injection molding die 1, the drive rod 11 is disposed at the outer end of the stationary mold 3, and the drive rod 11 is disposed on the outer surface of the stationary mold 3 The driving force of the driving rod 11 is transmitted to the gate opening / closing pin 17 and the gate opening / closing pin 17 is moved in the axial direction.

The drive rod 11 is disposed at the outer end of the stationary mold 3 and the drive source 200 is disposed outside the outer surface of the stationary mold 3 so that the structure of the injection mold 1 Can be simplified and reduced in size.

In general, in the injection molding die, since the gate opening / closing pin and the mechanism for moving the gate opening / closing pin are disposed in the fixed mold, the gate opening / closing pin 17 and the gate opening / Since the valve driving plate 13 is disposed in the fixed mold 3, the mold 1 for injection molding can be designed without changing the existing structure to a large extent, and the mold 1 for injection molding It is possible to avoid a significant increase in the design cost of the display device.

In the injection molding die 1, the gate opening / closing pin 17 is not axially urged by the pistons supported by the cylinders arranged in the axial direction of the gate opening / closing pin 17 Therefore, the distance (pitch) between the gate opening / closing pins 17 does not depend on the size of the outer diameter of the cylinder, and the pitch between the gate opening / closing pins 17 is reduced to further reduce the size of the injection- .

Furthermore, the manifold 18, the spool 19 and the nozzle 20 constituting the hot runner system are arranged inside the stationary mold 3, and the drive source 200 is arranged outside the stationary mold 3 Therefore, it is difficult for the drive source 200 to be affected by heat generated in the hot runner system, so that it is not necessary to provide a thermal cutoff unit or a cooling mechanism for the drive source 200.

Therefore, since the influence of the heat generated in the hot runner system on the drive source 200 is unlikely to occur, it is possible to improve the reliability of the operation of the drive source 200 and to improve the reliability of the operation of the drive source 200, It is possible to reduce the size of the injection-molding die 1 and the manufacturing cost.

In addition, since the driving source 200 is disposed outside the stationary mold 3, the influence of the gas generated inside the mold 1 for injection molding at the time of molding the molded product 400 reaches the drive source 200 The reliability of the operation of the driving source 200, the long life of the driving source 200, and the improvement in the maintenance property of the driving source 200 can be achieved.

The ejector pin 6 protruding from the cavity 5 is supported on the movable mold 2 and is moved in the axial direction of the gate open / close pin 17 into the fixed mold 3 A valve drive plate 13 is disposed.

Therefore, since the ejector pin 6, the valve driving plate 13 and the gate opening / closing pin 17, which are moved in the same direction, are separately positioned in the movable mold 2 and the fixed mold 3, respectively, It is possible to simplify the structure of the mold 1 and to facilitate the control of each part moved in the same direction.

Since the plurality of gate opening and closing pins 17 are simultaneously moved by the valve driving plate 13, there is no need to provide the driving rod 11 and the driving source 200 for each gate opening and closing pin 17, The structure of the mold 1 can be simplified and the manufacturing cost can be reduced.

In the above-described example, a plurality of cavities 5 are formed when the movable mold 2 is brought into contact with the fixed mold 3. In the injection mold 1, however, It is also possible to form one cavity 5 when it comes into contact with the fixed mold 3. In this case, the molten resin is discharged from the plurality of nozzles 20 into one cavity 5, and one molded product 400 is molded by the molten resin filled in one cavity 5.

1: Mold for molding
2: movable mold
3: fixed form frame
5: Cavity
6: Ejector pin
11: Driving rod (driving part)
12: Guide shaft
13: Valve drive plate
17: gate opening / closing pin
17a:
17b: gate opening /
18: Manifold
19: Spool
20: Nozzle
21: Flow path
23a: Gate
25: working plate
26: Rotating body
27: Support shaft
28a: outer peripheral surface
29: working plate
31:
31a:
32:
32a:
100: Supply nozzle (resin supply part)
200: driving source
300: molten resin
400: molded article

Claims (10)

A mold for injection molding having a fixed mold and a movable mold which form a cavity in which a molten resin is filled by being brought into contact with each other,
The fixed mold frame
A spool to which the molten resin is supplied,
A manifold in which a flow path through which the molten resin flowing from the spool flows is formed and disposed in the fixed mold,
A plurality of nozzles each having a gate for discharging the molten resin flowing in the flow path toward the cavity;
And a plurality of gate open / close pins which are moved in the axial direction to open and close the gates, respectively,
Wherein the injection molding die further comprises at least one driving part movably supported at an outer end of the fixed mold by moving the gate opening / closing pin in the axial direction,
Wherein the driving unit is driven by a driving source disposed outside the stationary mold and a driving force of the driving unit is transmitted to the plurality of gate opening / closing pins so that the plurality of gate opening / closing pins are moved in the axial direction
Mold for injection molding. The method according to claim 1,
The movable mold includes an ejector pin movably supported in the axial direction to project the molded article molded in the cavity to take the molded article out of the cavity
Mold for injection molding. The method according to claim 1,
Wherein the fixed mold further comprises a valve driving plate movably disposed in the axial direction in accordance with the movement of the driving unit,
Wherein one end of the gate opening / closing pin in the axial direction is provided as a gate opening / closing part for opening / closing the gate, and the other end in the axial direction is provided as a coupling part coupled to the valve driving plate
Mold for injection molding. 3. The method of claim 2,
Wherein the fixed mold further comprises a valve driving plate movably disposed in the axial direction in accordance with the movement of the driving unit,
Wherein one end of the gate opening / closing pin in the axial direction is provided as a gate opening / closing part for opening / closing the gate, and the other end in the axial direction is provided as a coupling part coupled to the valve driving plate
Mold for injection molding. The method of claim 3,
Wherein the fixed mold further comprises a plurality of guide shafts movably supporting the valve driving plate in the axial direction,
Wherein the plurality of guide shafts are disposed outside the manifold in a direction orthogonal to a moving direction of the valve driving plate
Mold for injection molding. 5. The method of claim 4,
Wherein the fixed mold further comprises a plurality of guide shafts movably supporting the valve driving plate in the axial direction,
Wherein the plurality of guide shafts are disposed outside the manifold in a direction orthogonal to a moving direction of the valve driving plate
Mold for injection molding. 7. The method according to any one of claims 3 to 6,
A plurality of the driving units are provided,
Wherein the plurality of driving portions are disposed at equal intervals in the radial direction from an axis extending in a moving direction of the valve driving plate through a central portion of the valve driving plate
Mold for injection molding. 8. The method of claim 7,
Wherein the plurality of driving portions are arranged at regular intervals in the circumferential direction about the axis
Mold for injection molding. 7. The method according to any one of claims 3 to 6,
Wherein one drive unit is provided,
Wherein the fixed mold has an action plate which is movable between the driving part and the valve driving plate in the same direction as the valve driving plate and is arranged to transmit the driving force of the driving part,
Further comprising a rotating body supported on the driving plate so as to be rotatable about a point extending in a direction orthogonal to the axial direction,
The action plate is in contact with the outer peripheral surface of the rotating body,
And a driving force of the driving unit is transmitted from the action plate to the valve driving plate via the rotating body
Mold for injection molding. 7. The method according to any one of claims 3 to 6,
The driving unit is one,
Wherein the fixed mold has an action plate which is movable between the driving part and the valve driving plate in the same direction as the valve driving plate and is arranged to transmit the driving force of the driving part,
Further comprising a transfer protrusion part having a curved surface part which is in contact with the other one of the action plate and the valve drive plate,
And a driving force of the driving unit is transmitted from the action plate to the valve driving plate via the transfer projection
Mold for injection molding.

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