JP2520288Y2 - Injection mold - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention is intended for injection-molding a resin product having a so-called undercut portion in which a protrusion having a funnel shape or the like is formed in a direction intersecting a mold opening direction. The present invention relates to an injection mold.

[Prior art]

FIG. 4 is a cutaway perspective view showing an example of an outlet of a resin automobile air cleaner cap M formed by injection molding.

The resin-made air cleaner cap M is formed in a dish shape, and from this bottom surface M1, a recess M2 for further increasing the depth is formed.
Has been extended.

A cylindrical funnel F is integrally formed on the side surface M3 of the recess M2.

For this reason, when the funnel F is taken out from the molding die in the direction of the arrow A after molding, it is a so-called undercut portion that cannot be pulled out as it is because it interferes with the die.

Injection molding dies conventionally used for forming resin products having such an undercut portion include those shown in Japanese Utility Model Publication No. 61-111714 and Japanese Utility Model Publication No. 61-118711.

These injection molding dies have a cavity die on the fixed side that forms the outer surface of the resin product and a core die on the moving side that forms the inner side, and a slide core that forms the undercut portion is installed on this core die. The core die moves in the direction perpendicular to the contacting / separating direction in synchronization with the movement of the core die in the contacting / separating direction.

In this conventional injection molding die, when the cavity die and the core die are opened, the resin product moves away from the core die and the cavity die, and the slide core moves relatively to the core die in the direction of coming out of the undercut portion. Therefore, it is possible to form an undercut portion such as a hole in the resin product.

However, when an air cleaner cap M having a funnel-shaped protruding portion formed in a direction intersecting the mold opening direction, which is the object of the present invention, is applied to this mold, the funnel F part interferes with the cavity die during mold opening. It cannot move in the mold opening direction.

Therefore, as shown in FIG. 4, at the tip of the slide core S for molding the inside of the funnel F portion, the placing core N is installed every time injection molding is performed, and the placing core N is opened after the mold is opened. It had to be taken out, and there was a problem that the automatic continuous operation of the injection molding machine could not be performed.

[Problems to be solved by the device]

In consideration of the above facts, the present invention aims to provide an injection mold capable of automatically and continuously molding a resin product having a funnel-shaped protruding portion formed in a direction intersecting the mold opening direction. is there.

[Means for solving the problem]

The injection mold according to the present invention is an injection mold for molding a resin product in which a protrusion is formed in a direction intersecting with a mold opening direction. In the injection mold, a cavity die for molding the outer surface of the resin product and an inner surface of the resin product. A core die that is formed so as to come into contact with and separate from the cavity die in the mold opening direction, an extrusion block slidably attached to the core die in the mold opening movement direction of the core die, and an extrusion block when the mold is opened. Holding means for holding the block and moving it relative to the core die; a slide core slidably attached to the extrusion block in a direction transverse to the mold opening movement direction of the core die to form the inner peripheral edge of the base of the protrusion; It is provided between the core die and the slide core, and the slide core is moved relative to the extrusion block by the mold opening operation of the core die, so that the protrusion of the resin product. Means for separating from the inner peripheral edge of the base of the projection part, and a slide cavity supported by the cavity die for forming the inner and outer peripheral surfaces of the projection part and slid in the projecting direction of the projection part in synchronization with the core die when the mold is opened. And a die.

[Action]

In the injection molding die having the above configuration, at the time of mold matching, a cavity die and a slide cavity die for molding the outer surface of the resin product, a core die for molding the inner surface of the resin product, an extrusion block, a slide core, and a slide cavity die. , And form a molding space for resin products by mutually approaching in synchronization with each other.

During mold opening operation after resin injection, the slide cavity die that molds the inner and outer circumferences of the protrusion moves in the protrusion direction of the protrusion in synchronization with the movement of the core die in the mold opening direction.
The slide core that forms the inner peripheral edge of the base of the protrusion moves in a direction away from the inner peripheral edge of the base of the protrusion with the movement of the extrusion block that moves in the mold opening direction.

Therefore, when the mold opening is completed and the resin product is removed in the mold opening direction, the slide cavity die and the slide core do not interfere with the resin product in the mold opening direction, so the resin product can be easily and quickly removed in the mold opening direction. be able to.

〔Example〕

 An embodiment of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, in the injection molding die 10, the air cleaner cap M is inserted into the cavity die 12 for outer surface molding while the core die 16 for inner surface molding is in the mold opening direction (arrow in FIG. 1).
It is supposed to be movable in the A and B directions.

The cavity die 12 is provided with a recess 12A for molding the outer peripheral surface, except for the outer side of the side surface M3 and the lower surface of a part of the bottom surface M1 of the air cleaner cap M shown in FIG.

Both ends of the cavity die 12 are fixed to a fixed mounting plate 20 via blocks 18.

Ejector plates 24, 26 fixed to each other are provided between the mounting plate 20 and the cavity die 12 so as to be movable in the mold opening direction (directions A and B in FIG. 1).

The ejector plates 24 and 26 are adapted to remove the air cleaner cap M from the cavity die 12 by pushing up the ejector pin 22 with the drive rod 60 that is raised by penetrating the fixed mounting plate 20.

A through hole 13 is formed in the cavity die 12, and the slide cavity die 14 is slidable along the through hole 13 in the directions of arrows C and D in FIG. 1, that is, in the direction orthogonal to the mold opening direction. ing. In this slide cavity die 14, the top surface of the tip portion (the left end portion in FIG. 1) is for molding a part of the bottom surface M1 of the air cleaner cap M, and the tip surface is the outer surface molding surface of the side surface M3. .

Further, a ring-shaped groove 14A having an axis in the sliding direction of the slide cavity die 14 (directions of arrows C and D) is formed on this tip end surface, and the air cleaner cap M which is a protruding portion is formed.
It is for molding the inner and outer peripheral surfaces of the funnel F portion in.

A guide hole 19 is provided in the vertical direction in the middle of the slide cavity die 14. The axis of the guide hole 19 is inclined to the left in FIG.

This guide hole 19 is a guide hole formed in the core die 16.
It is coaxial with 19A, and the rod 28 is inserted inside. The upper part of the rod 28 is fixed to the core die 16, and the lower part is slidably fitted in the guide hole 19.

When the rod 28 moves in the direction in which the core die 16 separates from the cavity die 12 (direction of arrow A in FIG. 1), the slide cavity die 14 moves according to the inclination angle of the axis of the rod 28.
Is moved in the direction away from the funnel F portion (direction of arrow C in FIG. 1).

The base end face of the slide cavity die 14 (the end face to the right in FIG. 1) is a block whose one end is fixed to the core die 16.
The contact surface is in contact with 30, and the contact surface is formed such that the upper part is inclined with respect to the moving direction of the core die 16 in the left direction in the drawing, and is in surface contact with the end surface of the slide cavity die 14.

The core die 16 has a protruding portion protruding downward from the side surfaces M3 and M2.
It is the inner peripheral surface forming surface 44 of the air cleaner cap M except for a part thereof.

The top surface of the core die 16 is fixed to the mounting plate 32 and is moved in the mold opening direction by driving the cylinder 58.

An opening 39 is formed inside the core die 16 above the molding surface 44, and the ejector plates 36, 38 are inserted into the opening 39.
Is provided. These ejector plates 36,3
Reference numeral 8 is connected to each other by a bolt (not shown), and is compressed downward by a compression coil spring 34. Upper ends of a plurality of return pins 40 that penetrate the core die 16 and contact the cavity die 12 are fixed to the ejector plates 36 and 38. The lower end of the return pin 40 corresponds to the top surface of the cavity die 12.

Therefore, the ejector plates 36 and 38 are located on the upper end surface of the opening 39 provided inside the core die 16 by being pressed by the return pin 40 before the mold opening.

A recess 44A is formed in the molding surface 44 formed on the core die 16, and the extrusion block 46 and the slide core 48 are arranged in the recess 44A.

The extrusion block 46 has an inner peripheral surface of the side surface M3 excluding the funnel F portion in the air cleaner cap M shown in FIG. 4 and a surface forming a part of the inner peripheral surface of the bottom surface M2 close to the side surface M3.

The push block 46 penetrates the core die 16 and has an upper end connected to a lower end of a rod 50 fixed to the ejector plates 36 and 38, and moves integrally with the ejector plates 36 and 38.

A slide core 48 is slidably held by the pushing block 46. The tip of this slide core 48 is
As shown in FIG. 2, the taper is tapered, and this tip end surface is the tip end surface of the slide cavity die 14 and comes into contact with the inner portion of the ring-shaped groove 14A.

The outer peripheral portion of the tapered portion forms a rounded portion M4 at the inner peripheral edge of the base of the funnel F.

The slide core 48 is housed in the extrusion block 46 and is slidable in a direction inclined with respect to the die opening direction of the extrusion block 46 (directions E and F in FIG. 1).

As shown in FIG. 2, the slide core 48 has a groove 48A formed in the end surface opposite to the funnel F portion.

The groove 48A is formed in the moving direction of the core die 16 (see arrows A and B in FIG. 1).
The guide rail 52 is formed so as to be inclined with respect to the direction) and is fixed to the core die 16. The tip T-shaped portion of the substantially T-shaped guide rail 52 is inserted so that the guide rail 52 can slide along the guide rail 52.

The plate 56 fixed to the slide core 48 corresponding to both sides of the guide rail 52 prevents the tip T-shaped portion of the guide rail 52 from coming off from the groove 48A, and guides the guide rail 52 in the groove 48A.
Is engaged.

Therefore, when the extrusion block 46 remains in the molding position and the core die 16 moves in the mold opening direction, the guide rail 52 and the groove
48A slides and slide core 48 pushes out block 4
6 is driven in the direction of arrow E and is separated from the base of the funnel F.

Next, the operation of this embodiment configured as described above will be described.

FIG. 1 shows a state in which the molds are matched. In this state, the cavity die 12 and the slide cavity die 14 for molding the outer surface of the resin product, the core die 16 for molding the inner surface of the resin product, the extrusion block 46, The slide core 48 is close to each other and forms a molding space for the resin product.

The nozzle bush 62 provided between the cavity die 12 and the mounting plate 20 in the product forming space in the state where the molds are matched.
The molten resin is injected from.

After the resin is cooled and hardened, the hydraulic cylinder 58 is driven to move the core die 16 in the direction away from the cavity die 12 (direction of arrow A in FIG. 1) to open the mold.

Even if the mold opening begins as shown in Fig. 3, the spring
Since the lower end of the return pin 40 is kept in contact with the cavity die 12 by the urging force of 34,
These return pins 40 are attached to the ejector plates 36,3
The return pin 40 is extruded from the core die in the direction of arrow B in FIG.

The rod 50, the upper ends of which are fixed to the ejector plates 36 and 38, also keeps the extrusion block 46 in the molding position, so that the extrusion block 46 is extruded from the core die 16 in the direction of arrow B in FIG.

Therefore, the guide rail 52 that rises together with the core die 16
Slide in the longitudinal direction of the groove 48A, and slide core 48
Slides on the extrusion block 46 and moves in the direction of arrow E in FIG. That is, the slide core 48 is separated from the inner peripheral edge of the base of the funnel F portion as shown in FIG. 3, and the interference in the mold opening direction is eliminated.

On the other hand, when the rod 28 fixed to the core die 16 moves in the direction in which the core die 16 separates from the cavity die 12 (the direction of arrow A in FIG. 1), the slide cavity die is moved in accordance with the inclination angle of the axis of the rod 28. 14 is moved in the direction of arrow C in FIG. As a result, the ring groove 14A of the slide cavity die 14 comes out of the funnel F portion and interference in the mold opening direction is eliminated.

Finally, the ejector pin 22 is driven by the drive rod 60 in the upward direction (the direction of arrow A in FIG. 1) to release the air cleaner cap M from the cavity die 14.

In this state, both the slide cavity die 14 and the slide core 48 have already retracted from the projecting direction of the funnel F portion, so that there is no interference with the extracting operation of the funnel F portion.

A stopper (not shown) is attached to the end of the ring groove 48A so that the slide core 48 does not fall off from the core die 16 even when the core die 16 is further raised from the state shown in FIG.

Furthermore, in order to perform injection molding of a new air cleaner cap M from this state, the hydraulic cylinder 58 is driven to drive the core die.
16 is moved in the direction of approaching the cavity die 12 (direction of arrow B in FIG. 1) to perform mold matching.

When the matching process starts, the return pin 40 will
The ejector plates 36 and 38 first against the urging force of the
Push up in the direction of arrow A in the figure.

By the backward movement of these ejector plates 36, 38 with respect to the core die 16 (in the direction of arrow A in FIG. 1), the rod 50 also pushes back the pushing block 46 in the direction of arrow A in FIG. 1, and the slide core 48 engaged with the guide rail 52. However, since the slide core 48 moves obliquely downward in FIG. 1, the slide core 48 advances in the extrusion block 46 and is accommodated in the accommodating portion 16A in the core die 16 together with the extrusion block 46.

On the other hand, when the core die 16 moves in the direction of approaching the cavity 12 (direction of arrow B in FIG. 1), the rod 28 moves the slide cavity die 14 in the mold alignment direction (direction of arrow D in FIG. 1).
Direction), and at the end of the stroke, block 30
Strongly pushes the slide cavity die 14 in the direction of arrow C to bring it into contact with the tip of the slide core 48.

In order to avoid the generation of unnecessary stress in this case, it is preferable to provide a slight gap between the rod 28 and the through hole 19.

In this state, the resin product molding space is formed, the molten resin is injected, and the above operation is repeated.

In the above-mentioned embodiment, the present invention has been applied to the air cleaner cap M for automobiles. However, the present invention is applicable to office equipment and home electric appliances, etc. in which the protrusion is provided in the direction orthogonal to the mold opening direction. It is also applicable when molding resin products.

[Effect of device]

As described above, the injection mold according to the present invention is
In synchronization with the movement of the core die in the mold opening direction, the slide cavity die for molding the inner and outer peripheries of the protrusion moves in the protrusion direction of the protrusion, and the slide core for molding the inner peripheral edge of the base of the protrusion also protrudes. Since it moves in a direction away from the inner peripheral edge of the base of the part, there is no interference when removing the resin product in the mold opening direction, and the resin product with a funnel-shaped protrusion is formed in the direction intersecting the mold opening direction. It can be molded by automatic continuous operation of the injection molding machine.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an injection molding die according to an embodiment of the present invention at the time of mold matching, FIG. 2 is a cross-sectional view taken along line II-II of FIG. 1, and FIG. 3 is a mold opening time of FIG. 4 is a partially cutaway perspective view showing an air cleaner cap M which is an example of a resin product. M: Air cleaner cap, 12: Cavity die,
14 …… Slide cavity die, 16 …… Core die, 46…
… Extrusion block, 48 …… Slide core.

Claims (1)

(57) [Scope of utility model registration request] 1. An injection molding die for molding a resin product having a protrusion formed in a direction intersecting the mold opening direction, wherein a cavity die for molding the outer surface of the resin product and the cavity for molding the inner surface of the resin product. A core die that is installed in the die opening direction so as to be movable in and out of the die opening direction, an extrusion block that is slidably attached to the core die in the die opening movement direction of the core die, and holds the extrusion block when the die is opened. Holding means for moving relative to the core die, a slide core slidably attached to the extrusion block in a direction transverse to the mold opening movement direction of the core die and forming the inner peripheral edge of the base of the protrusion, the core die and the slide core Between the extrusion block and the slide core by the mold opening operation of the core die provided between Engaging means for separating from the peripheral edge, and a slide cavity die supported by the cavity die for forming the inner and outer peripheral surfaces of the protruding portion and sliding in the protruding direction of the protruding portion in synchronization with the core die when the mold is opened. Injection mold having.