JPH0880536A - Core mounting method for foaming mold and the foaming mold - Google Patents

Abstract

PURPOSE: To provide a core mounting method for a foaming mold wherein a core, particularly a large-sized core can be mounted on a mold face easily, and the foaming mold. CONSTITUTION: In a method for mounting a core on a mold face of a foaming mold for molding a foamed molded piece with core, a slide pin 26 which slides in an attaching/detaching direction of the core 50 is provided on the mold face 24 of the foaming mold. On the other hand, a pin hole 51 in which the slide pin can be fitted is formed in the core. After the core is mounted temporarily on the mold face and the slide pin is fitted into the pin hole, the slide pin 26 is slid so as to move the core to a regular mounting position.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for mounting a foam molding die core and a foam molding die.

[0002]

2. Description of the Related Art In a foam-molded article used for an automobile instrument panel or the like, a foam layer is provided on a core (also called a base material) as a strength member, and the surface of the foam layer is covered with a skin. The one covered with is used.

In the production of the foamed molded product having the core, the core 63 is usually attached to the mold surface 62 of the upper mold 61 of the foam molding mold 60 as shown in FIG. Is performed by disposing a skin material (not shown) and injecting a foaming raw material into the skin material to foam.

By the way, in mounting the core on the mold surface, a set pin 66 is provided at a predetermined position on the mold surface of the upper mold, and
This is often done by forming a pin hole 67 in the core 63 at a position corresponding to the set pin 66, disposing the core 63 on the upper mold surface and fitting the set pin 66 into the pin hole 67. . As the core, a metal press-molded product, a resin-molded product, or a fiber-reinforced resin-molded product is used. Especially in a large-sized foam-molded product such as an instrument panel, a resin is mainly used for weight reduction. A molded product or a fiber reinforced resin molded product is used.

Since the core of the resin molded product or the fiber-reinforced resin molded product is easily deformed by shrinkage after core molding,
It often has a part that does not follow the mold surface. Therefore, when the core is mounted on the mold surface, it is mounted while hitting the core with a resin hammer for the purpose of fitting the core to the mold surface. However, in that case, if the core is hit too hard, the core will crack and the core must be replaced. On the other hand, in order to easily attach the core to the mold surface by hand, if the mold surface is designed to be small, a gap is created between the core and the mold surface, and at the gap portion due to the foaming pressure of the foam raw material during foam molding. The core is deformed, and defects such as dimensional defects occur in the foamed molded product.

Further, in a foam molding die for a large foam molded article such as an instrument panel, a set pin is provided at a plurality of positions on the mold surface. However, even if it is attempted to attach the set pins to some of the set pins, it may not be possible to fit all the set pins into the pin holes because only some of the set pins fit into the pin holes. Therefore, in order to fit all the set pins into the pin holes, it is necessary to hit the core in multiple places, and moreover, it is necessary to check whether all the set pins fit into the pin holes, which is a troublesome task. There is.

[0007]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and a method for mounting a core, particularly a foam molding die, in which a large-sized core can be easily mounted on a mold surface and a method thereof. A foam molding die is provided.

[0008]

A first aspect of the invention is to provide a mold surface of a foam molding die for molding a foam molded article having a core,
In the method of mounting the core, the mold surface of the foaming mold is provided with a slide pin that slides along the attachment / detachment direction of the core, while the core is provided with a pin hole into which the slide pin is fitted. It is characterized in that the core is temporarily mounted on a mold surface and a slide pin is fitted into the pin hole, and then the slide pin is slid to move the core to a regular mounting position.

A second invention is a foam molding die having a mold surface on which a core of a foam molded article is mounted, wherein the mold surface has:
A slide pin that fits into a pin hole formed in the core temporarily mounted on the mold surface and moves the core to a regular mounting position on the mold surface is provided so as to slide along the attachment / detachment direction of the core. Characterized by

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the accompanying drawings. 1 is a schematic perspective view of an example of the foaming mold of the present invention, FIG. 2 is a sectional view taken along line 2-2, FIG. 3 is a plan view of a mold surface of the slide pin portion, and FIG. 4 shows an example of the slide pin portion. FIG. 5 is a cross-sectional view, FIG. 5 is a schematic perspective view showing when the core is attached to the foaming mold, and FIG. 6 is a 6-6 cross-sectional view thereof.

First, the foaming mold used in the core mounting method of the present invention will be described. 1 to 3 show an example of the foaming mold 10. The foaming mold 10 is for molding a foaming molded product having a core, and includes the upper mold 2
1 and the lower mold 41 are connected by a hinge 11 so that they can be opened and closed.

As shown in FIG. 6, the upper mold 21 of this embodiment comprises a frame 22 and an inner surface 23 formed on the frame 22. A mold surface 24 for mounting the core is formed at the center of the inner surface 23 so as to project according to the shape of the core. After the core is temporarily mounted at the temporary mounting position on the mold surface 24, the core is moved to the regular mounting position by the slide pin described later. A chain line 12 in FIG. 1 indicates a position where one end of the core is arranged when the core is temporarily mounted, and a reference numeral 13 indicates a position where one end of the core is arranged when the core is normally mounted.

Although the temporary mounting position of the core varies depending on the shape of the core and the like, it is set to a mold surface portion where the core can be easily mounted by hand. In this embodiment, the chain line 12
The line corresponding to is not actually drawn on the mold surface, but may be formed by carving a line corresponding to the chain line 12 on the mold surface 24 as a guide for the temporary mounting position.

An elongated hole 25 is formed in a predetermined portion of the mold surface 24 along the attaching / detaching direction of the core, in this embodiment, the front-rear direction of the foaming mold 10 (direction A shown in FIG. 1). Two
A slide pin 26, which slides in 5, is attached to the back side of the mold surface 24 together with a slide device 27. The elongated holes 25 and the slide pins 26 are located on the mold surface on which the core is arranged when the core is temporarily mounted, and are provided at least at the central portion of the mold surface 24 and on both sides thereof in total, as in this embodiment. However, it may be provided also on the side surface 24a of the mold surface 24 and on the lower side surface 24b when the upper mold 21 is opened as shown in FIG. Further, it is preferably provided on the mold surface on which the core portion in which the foam layer is formed is arranged. This is because, in the core portion where the foam layer is not formed, the upper die 21 and the lower die 41 are not normally clamped, and the slide pin 26 easily comes off from the pin hole of the core described later.

In this embodiment, the elongated hole 25 is
As shown in FIGS. 2 and 3, it is formed on the base 28 attached to the opening 24c formed on the mold surface of the upper mold.
The base 28 is made of a metal plate, a resin plate, or the like, and has a guide slide recess 29 formed in the surface along the sliding direction of the slide pin 26, and the slot 25 is formed in the recess 29.

The slide pin 26 is for moving the core temporarily mounted on the mold surface 24 to the core regular mounting position, and in this example, as shown in FIG. 4, a cylindrical pin holder 26a. It is inserted so that it can move forward and backward. A coil spring 26 is provided at the rear of the slide pin 26.
b is arranged, and the wire cable 26c is attached to the rear end of the slide pin 26. By pulling the wire cable 26c with a cylinder device provided outside the mold or a manual mechanical device (neither is shown), the slide pin 26 is drawn into the pin holder 26a, and at that time, the coil spring 26b is Compressed. Then, when the pulling force of the wire cable 26c is relaxed, the slide pin 26 advances due to the restoring force of the coil spring 26b and projects from the mold surface 24. Reference numeral 26d is a screw bush, 26e is a seal member, 26f is a spring bearing,
26g is a tube through which the wire cable is passed.

The slide pin 26 is provided in a direction intersecting with the attaching / detaching direction of the core, preferably in a direction perpendicular to the attaching / detaching direction of the core. It is preferable that the slide pin 26 does not easily come off from the pin hole when the slide is performed.

The slide device 27 is for sliding the slide pin 26 in the attaching / detaching direction of the core, and is a block 31 for holding the pin holder 26a.
And a cylinder device 32 that slides the pin holder 26a through the block 31.

The block 31 has a pin holder 26a.
The side portion outer peripheral surface of the cylinder portion 33 is fitted into the cylinder portion 33, and the arm portion 34 extending from the side surface of the cylinder portion 33. The piston 35 of the cylinder device 32 is connected to the arm portion 34. Further, a donut-shaped disc 36 is arranged at the tip of the cylindrical portion 33,
On the other hand, in the guide slide recess 29 of the base 28, a substantially rectangular plate-shaped guide 37 fitted to the outer peripheral surface of the tip of the pin holder 26a is slidably mounted. Then, the tubular portion 33 of the block and the plate-shaped guide 37 are inserted through the donut-shaped disc 36 to form the guide slide recess 2 of the base 28.
9 and pin holder 26a and slide pin 26
Hold slidably.

The cylinder device 32 is of a known type in which the piston 30 moves forward and backward by air or hydraulic pressure. Instead of the cylinder device, a device in which a crank, an arm, etc. are connected to a drive motor, or another forward / backward device may be used. The cylinder device 32 is fixed to the back surface of the base 28 by a mounting member 38.

On the other hand, the lower mold 41 has a mold surface 42 corresponding to the shape of the molded product. A skin material is arranged on the mold surface 42 as needed.

Next, a method of mounting the core on the foam molding die 10 will be described. First, as shown in FIG. 1, the slide pin 26 is located on the temporary mounting side of the core, which is the front side of the foaming mold in this embodiment. At that time, the slide pin 26
Is retracted from the mold surface 24.

Then, in accordance with the temporary mounting position of the core shown by the chain line 12, as shown in FIGS.
Is temporarily attached to the mold surface 24 of the upper mold, the slide pin 26 is projected from the mold surface 24, and the slide pin 26 is fitted into the pin hole 51 formed in the core 50 in advance.

The core 50 used is made of a pressed product made of resin, fiber reinforced resin or metal, and has a pin hole 51 formed at a position corresponding to the slide pin. It is preferable that the pin hole 51 has an elongated hole shape so that the slide pin 26 can be easily fitted during the temporary mounting. In this elongated hole shape, it is preferable that the major axis is about three times as long as the pin diameter and the minor axis is about 2 mm larger than the pin diameter. In this embodiment,
20mm x 8m pin hole 51 for 6.5mm pin diameter
It is supposed to be m.

Next, the cylinder device 32 is operated to slide the slide pin 26, and the core 50 engaged with the slide pin 26 is moved to the regular mounting position as shown by the chain line in FIG. 6, and at that position. Hold. As a result, the core 50 is securely mounted at the regular mounting position on the mold surface 24.

An appropriate skin material (not shown) is arranged on the mold surface 42 of the lower mold 41, and a foaming material such as a urethane material is injected into the skin material to foam in a closed mold state. A foamed molded product having a core is molded.

Further, at the time of releasing the molded product after foam molding,
Before opening the foaming mold 10, the slide pin 26 is housed in the mold surface 24, then the foaming mold 10 is opened, and the slide pin 26 is slid to the position at the time of temporary mounting. As a result, the engagement between the core 50 and the slide pin 26 is released,
Demolding the molded product becomes easy. When releasing the molded product, a known ejecting device (not shown) is placed at an appropriate position on the upper mold.
May be provided, and the core (molded product) may be projected from the back surface.

[0028]

As shown and described above, according to the core mounting method and the foam molding die of the present invention, the core has been hit by a hammer or the like so that the core is hit with a hammer to the regular mounting position on the mold surface. Even if it is difficult to mount the core, you can temporarily mount the core at the temporary mounting position on the mold surface and then slide the slide pin to move the core to the normal mounting position. Can be attached to the surface. Moreover, since it is not necessary to hit the core with a hammer, there is no risk of the core being damaged by the hammer, and work can be performed efficiently. Particularly, for a large core, the distortion due to the deformation is large, and it is not easy to manually mount it in the regular mounting position, so the present invention is extremely useful. Of course, even with a small core, according to the present invention, the core can be easily and correctly mounted.

Further, in the case where a part of the core is exposed as the surface of the foam-molded article, and the core having the texture pattern formed on the exposed core surface, the texture pattern is formed by hitting with the hammer. Crushed, there was a risk of impairing the surface appearance of the foam molded article, according to the present invention, because there is no need to hit with a hammer, there is no risk of crushing the texture pattern,
A foamed molded product having a good appearance can be molded.

[Brief description of drawings]

FIG. 1 is a schematic perspective view of an example of a foaming mold of the present invention.

FIG. 2 is a 2-2 sectional view thereof.

FIG. 3 is a plan view of a mold surface of the slide pin portion.

FIG. 4 is a sectional view showing an example of a slide pin portion.

FIG. 5 is a schematic perspective view showing when a core is attached to the foaming mold.

FIG. 6 is a 6-6 sectional view thereof.

FIG. 7 is a schematic perspective view showing when a core is mounted on a mold surface of a conventional foaming mold.

[Explanation of symbols]

 10 Foam Mold 21 Upper Mold 24 Upper Mold Surface 25 Long Hole 26 Slide Pin 27 Slide Device 41 Lower Mold 50 Core 51 Pin Hole

Claims (3)

[Claims] 1. A method of mounting the core on a mold surface of a foam mold for molding a foam molded article having a core, wherein the mold surface of the foam mold is along the attaching / detaching direction of the core. A slide pin that slides is provided, and on the other hand, a pin hole into which the slide pin is fitted is formed in the core, and the core is temporarily mounted on a mold surface and the slide pin is fitted into the pin hole, and then the slide pin is slid. A method for mounting a core of a foam molding die, characterized in that the core is moved to a regular mounting position. 2. A foam molding die having a mold surface on which a core of a foam-molded article is mounted, wherein the core is fitted in a pin hole formed in the core temporarily mounted on the mold surface. A foam molding die, wherein a slide pin for moving the mold to a regular mounting position on the mold surface is provided so as to slide along the attachment / detachment direction of the core. 3. The foam molding die according to claim 2, wherein the slide pin is capable of protruding from the die surface and housed therein.