JPH08174601A - Method and apparatus for integral molding of skin - Google Patents

Abstract

PURPOSE: To perform winding and cutting of a skin material simultaneously with molding by connecting a shear edge for preventing a resin from leaking between the apex of the inside of a mold and the first mold and a shear edge for cutting the skin material between the inside of the step difference and the first mold with a sliding apparatus and arranging them on the mold face of the second mold. CONSTITUTION: A welding pin 40 projecting to the second mold 20 side is connected with an electric source part and can be slid to the second mold 20 side by means of a cylinder apparatus 41. A slide core piece 50 arranged on the facing face to the first mold 10 on the outside of the cavity K of the second mold 20 is connected with a rod 52 of a cylinder apparatus 51 as a sliding apparatus and is arranged on the wall face of the second mold 20. A resin is prevented from leaking by the first shear edge A formed by the apex part 53 of the inside of the mold of the slide core piece 50 and the first shear edge face 10b of the first mold 10 and a skin material H is cut by the second shear edge B formed by the inside of the step difference of the slide core piece and the second shear edge face 10c of the first mold 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for integrally forming a skin and an apparatus for integrally forming a skin, and in particular, a skin capable of winding the skin on the back side of a molded article at the same time as integrally forming the skin and simultaneously cutting the skin material. The present invention relates to an integral molding method and an integral skin molding device.

[0002]

2. Description of the Related Art Generally, for interior parts of automobiles, a molded product with a skin is widely used in which various skin materials are laminated on the surface of a base material made of a thermoplastic resin or the like in order to give a high-grade feeling. In order to manufacture a molded product with a skin, a skin-integrated molding device is used, and a skin material is placed between two molds, and a resin is supplied together with mold clamping for molding.

That is, FIGS. 13 to 17 show a conventional manufacturing process. As shown in FIG. 13, a skin material H is arranged between upper and lower molds 101 and 102, and one mold 101 side The molten resin is supplied, and the upper and lower molds 101 and 102 form a skin-integrated molded product having a predetermined shape. At this time, the skin material H
Are held by the clamp device 103.

The molded product molded in this manner is shown in FIG.
As shown in, the skin material H is not wound on the back side of the product, so that the winding process is required. Therefore,
As shown in FIG. 15, in order to cut (trim) the excess portion of the end of the skin material H and to bond it to the back surface of the base material, FIG.
As shown in (3), the back surface of the skin material H was coated with an adhesive and dried, and the back surface of the base material to be the product was wound and bonded.

[0005]

SUMMARY OF THE INVENTION A step of trimming a skin material after removing a molded product obtained by molding a skin material and a base material in this way, or winding the skin material on the back surface of the base material for bonding. Processes and the like are required, and these operations must be performed at a place different from the molding process.

The conventional technique has a disadvantage that it requires a post-process after the molding, the number of molding processes is large, and that the work requires personnel and a working space.
In addition, it was necessary to handle the adhesive when it was rolled up.

The object of the present invention is to integrally mold the skin,
It is an object of the present invention to provide a skin-integrated molding method and a skin-integrated molding apparatus capable of preventing the skin material from breaking at the same time as molding and simultaneously winding the skin material and cutting the skin material.

[0008]

According to another aspect of the present invention, there is provided a skin integral molding apparatus, wherein a cavity is formed by a first mold and a second mold which face each other, and a molten resin is injected between the molds facing each other. In the apparatus for integrally forming a skin, the first die includes an ejector pin and a welding pin, the second die includes a slide piece, and the ejector pin is a second die.
The welding pin is formed in the cavity of the mold and is formed on the first mold so as to be able to project to the second mold side.
The slide piece is arranged in the cavity area of the die and is slidable toward the second die side. The slide piece is a die inner tip portion of the slide piece formed in the die sliding direction and an outer side from the tip portion. A second mold having a step surface formed at a position in a direction intersecting with the mold sliding direction and a welding pin through hole formed in the mold sliding direction and connected to the sliding device. , A shear edge for preventing resin leakage between the inner tip of the die and the first die, and a shear for cutting the skin material between the inner side of the step surface and the first die. It is characterized in that the edges and are respectively configured.

According to a second aspect of the present invention, there is provided a method for integrally molding a skin, wherein a skin material is disposed between a first mold and a second mold which face each other to form a cavity, and molten resin is injected and the mold is clamped. In the method for integrally forming a skin, the step of disposing the skin material between the first mold and the second mold while holding both end sides of the skin material, supplying molten resin, and closing the skin to mold the skin. A molding step of molding the material and the base material integrally and securing the end portion of the skin material of a predetermined length to form the skin material other than the end portion and the molten resin, and cooling after the molding step. A step of opening the mold, a step of pressing the molded article molded in the molding step into the cavity of the second mold, a step of arranging the skin material end portion on the back side of the molded article, and a arranged skin material terminal And a step of joining the resin portion and the resin with a welding pin.

[0010]

An embodiment of the present invention will be described below with reference to the drawings. The members, arrangements, and the like described below do not limit the present invention and can be variously modified within the scope of the gist of the present invention. In this example, compression molding using low pressure injection or so-called stamping molding will be described as an example.

1 to 10 show an apparatus for integrally forming a skin according to the present invention. FIG. 1 is a cross-sectional explanatory view showing a mold open state of the apparatus for integrally forming a skin, and FIG. An enlarged cross-sectional view, FIG. 3 is an enlarged cross-sectional view of an essential part showing a cut state of the skin material during mold clamping, FIG. 4 is an enlarged cross-sectional view of an essential part showing a mold open state, and FIG. 5 is a state in which the skin material is wound by a slide piece. 6 is an enlarged cross-sectional view of an essential part showing a welding process, FIG. 6 is an enlarged cross-sectional view of an essential part showing a state in which the slide piece is moved after welding is completed, and FIG. 8 is a movable slide piece. FIG. 9 is an explanatory view showing the previous state, FIG. 9 is an explanatory view showing a state where a part of the slide piece is moved, and FIG. 10 is an explanatory view showing a state where the slide piece is moved to the position of the welding pin. 12 is a sectional view of the molded product.

The first mold 10, the second mold 20, the ejector pin 30, the welding pin 40, and the slide piece 50.
, And are the main components. The first mold 10 and the second mold 20 of this example are arranged so as to face each other, and the first mold 10 is a fixed-side mold and the second mold 20 is a movable-side mold.

The first mold 10 and the second mold 20 form a cavity K having a predetermined shape. The first mold 10 of the present example is arranged on the base 13 with a space 14 in between, and is connected to the injection device 60 side through a pipe line 61 in this space 14. A passage 1 for supplying the resin injected from the injection device 60 onto the mold 10 in the mold 10.
1 and an insertion hole 1 for inserting the ejector pin 30
6, a disposition hole 17 for the welding pin 40, and a disposition space 18 for a device or the like for extending the welding pin 40 are formed.

Then, the molten synthetic resin J is injected into the cavity K from the injection device 60 side of the molten synthetic resin J through the passage 11 and the gate 12 in the first mold 10 which is the stationary mold. ing. Further, in this example, after the pressure die is clamped by the first die 10 and the second die 20, cooling or the like can be performed. Known techniques can be used for the device for injecting the molten synthetic resin J, the mold clamping device, and the like.

The facing surface on the second mold 20 side of the first mold 10 of this example constitutes a first shear edge A between the mold surface 10a forming the cavity K and a slide piece 50 described later. The first shear edge surface 10b and the second shear edge surface 10c forming the second shear edge B are configured to have a step.

Further, the ejector pin 30 is arranged at a predetermined position on the first mold 10 of this embodiment, and this predetermined position is within the cavity K of the second mold 20.
It is configured to be able to project to the side. That is, the base end portion 31 of the ejector pin 30 is connected to the support member 32 arranged in the space 14.

The support member 32 is composed of a predetermined plate body, and is configured to be slidable in the space 14 by a cylinder device or the like (not shown). By sliding the support member 32, an ejector pin is formed. 30 is the first mold 1
It extends from the mold surface 10a of 0. Ejector pin 3
It is preferable to form a plurality of 0s, and a plurality of 0s can be formed within the arrangement range of the support member 32 made of a plate.

The welding pin 40 of this example is the same as the first mold 10 described above.
And the welding pin 4 and the disposition hole 17 of the welding pin 40 formed in the
It is provided in the installation space 18 such as a device for extending 0,
The welding pin 40 is arranged on the end side of the cavity K in the range of the cavity K of the first mold 10. The welding pin 40 of this example is formed so as to project toward the second mold 20 side. The welding pin 40 is connected to a power supply unit (not shown), and the cylinder device 41 moves the welding pin 40 toward the second mold 20 side. It is slidably formed.

As the welding pin 40 of this embodiment, various well-known welding means such as high frequency and ultrasonic waves can be used.

A slide piece 50 is provided on a surface 21 of the second mold 20 of the present example, which is outside the cavity K and faces the first mold 10. The slide piece 50 of this example is connected to a rod 52 of a cylinder device 51 as a sliding device, and is arranged on the mold surface 21 of the second mold 20.
Of the slide piece 50 of this example, the slide piece 50b is formed so that the mold surface 21 can slide toward the cavity K as shown in FIG.

The slide piece 50 has a tip 53 inside the mold.
And the step surface 54 are formed to have a step, the die inner end portion 53 is formed in the second die 20 direction of the slide piece 50, and the step surface 54 is located outside the die inner end portion 53. Are formed in the die sliding direction.

Further, in this example, the welding pin through hole 55 is formed in the slide piece 50b.
It is provided at a position outside 4 in the sliding direction of the second mold 20. In this example, the welding pin through hole 55 is not formed in the slide piece 50a.

The tip 5 of the slide piece 50 inside the mold
3 and the first shear edge surface 10b of the first mold 10 prevent the resin from leaking by the first shear edge A, and the inside of the step surface of the slide piece 50 and the second shear edge surface 10c of the first mold 10 make 2 The skin material H is cut by the shear edge B.

The resin used as the base material in the present invention, that is, the molten synthetic resin J to be injected is, for example,
Polypropylene, polyethylene, polystyrene, acrylonitrile-styrene-butadiene copolymer, thermoplastic resin such as nylon, ethylene-propylene block copolymer, thermoplastic elastomer such as styrene-butadiene block copolymer Compression molding, injection molding and extrusion Any of those usually used for molding can be used. In addition, those containing additives such as inorganic fillers, fillers such as glass fibers, pigments, lubricants, and antistatic agents can also be appropriately used.

The skin material H used in the present invention may be a sheet or film made of a material such as PVC that can be welded. The above-mentioned materials may be used alone or as a laminate of two or more kinds as the skin material H.

Next, a process of manufacturing a skin-integrated molded product by using the skin-integrated molding device having the above-mentioned structure will be described.

First, as shown in FIG. 1, when the first mold 10 and the second mold 20 are open, the skin material H is mounted.
The skin material H is held by known clamping means 70. At this time, the ejector pin 30 and the welding pin 40 are accommodated in the first mold 10. Then, the first mold 10 and the second mold 20 are clamped. At the same time as the mold clamping or at a predetermined time interval, the molten resin J is supplied as shown in FIG.

Then, as shown in FIG. 3, the mold is clamped and molded. At this time, the first shear edge A prevents resin leakage, and the second shear edge B cuts the skin material H. Since the skin material H is cut at the second shear edge B, an extra end portion of the skin material H remains. As described above, the skin material H and the base material (solidified molten resin) are integrally molded, and the skin material terminal portion of a predetermined length is secured, and the skin material H and the base material (molten resin) other than the terminal portion are secured. And mold.

Next, after the molding process, the second mold 2 is cooled by cooling.
Move 0 to open the mold. Further, the molded product molded in the molding process is pressed into the cavity of the second mold 20. That is, the ejector pin 30 is moved along with the movement of the first mold 10 to leave the molded product in the second mold 20 as it is. As in this example, the ejector pin 3 is moved along with the movement of the second mold 20 by opening the mold.
It is preferable that 0 is projected and the molded product is pressed at the same timing as the mold opening, but it can be moved after the second mold 20 is opened.

Next, a step of arranging the end portion of the skin material on the back side of the molded product, that is, a so-called winding step of the skin material H is performed. That is, the cylinder device 51 is driven to move the slide piece 50b from the state shown in FIG. 4 to the cavity side. As a result, the surplus end portion of the skin material H is wound around the back side of the base material (solidified molten resin) by the slide piece 50b as shown in FIG. At this time, the extended position of the welding pin 40 and the welding pin through hole 55
The slide piece 50b is stopped at a position where the positions are aligned.

At this time, the slide piece 50 (50a, 50
The movement of b) will be described with reference to FIGS. 8 to 10.
The slide piece 50 is divided into a plurality of pieces, for example, 16 pieces in the example shown in FIG. Of the divided slide pieces 50, the slide pieces 50 that move to the outside of the mold
a and slide pieces 50b that move to the inside of the mold are alternately arranged. Each slide piece 50 is provided with a cylinder device 51 via a rod 52.

As described above, the slide piece 50b is provided with the welding pin through hole 55. In order to enable the slide piece 50b to move to the cavity k side, first, the slide piece 50a is formed as shown in FIG. The state moves from the state to the outside as shown in FIG. Then, the slide piece 50b moves to the position of the welding pin 40.

Further, a welding process is performed. That is, as shown in FIG. 6, the welding pin 40 is moved from the first mold 10 to the second mold 2.
Extend to the end of the 0 skin material. Then, the base material and the skin material H are fused and bonded. Welding by the welding pin 40 is performed for several seconds, and then the welding pin 40 is housed in the first mold 10.

After the welding pin 40 is accommodated, the slide piece 50b moves to the outside of the cavity, and the molded product is ready for demolding. Therefore, the second mold 20 should be separated from the first mold 10. Move and demold.

FIG. 11 is an enlarged sectional view of a main part showing a welding process according to another embodiment. In this example, the position of the welding pin through hole 55 is formed on the tip side of the slide piece 50b on the inner side of the mold, and in the case of this example, the skin material H and the base material are formed in the vicinity of the end of the skin end portion. Can be joined.

[0036]

As described above, according to the present invention, molding, cutting of the skin material, and winding of the skin material can be performed. It is possible to reduce the winding process and the cutting (trim) process. Therefore, the work required in the subsequent process is unnecessary, and the labor can be saved.

Further, the adhesive is not required when the skin material is rolled up, and various problems caused by using the adhesive can be avoided. Furthermore, since the post-process is not required, the work space for the post-process, which has been required in the past, becomes unnecessary, and the space can be effectively used.

As described above, according to the present invention, in the integral skin molding, the skin material can be prevented from being broken and the skin material can be wound and cut at the same time as the molding.

[Brief description of drawings]

FIG. 1 is a cross-sectional explanatory view showing a mold open state of an apparatus for integrally forming a skin according to the present invention.

FIG. 2 is an enlarged sectional view of an essential part in a mold clamping start state.

FIG. 3 is an enlarged sectional view of an essential part showing a cut state of a skin material in mold clamping.

FIG. 4 is an enlarged sectional view of an essential part showing a mold open state.

FIG. 5 is an enlarged sectional view of an essential part showing a state in which a skin material is wound by a slide piece.

FIG. 6 is an enlarged sectional view of an essential part showing a welding process.

FIG. 7 is an enlarged sectional view of an essential part showing a state in which the slide piece has been moved after welding has been completed.

FIG. 8 is an explanatory diagram showing a state before moving the slide piece.

FIG. 9 is an explanatory diagram showing a state in which a part of the slide piece is movable.

FIG. 10 is an explanatory diagram showing a state where the slide piece is moved to the position of the welding pin.

FIG. 11 is an enlarged sectional view of an essential part showing a welding process according to another embodiment.

FIG. 12 is a cross-sectional view of a molded product.

FIG. 13 is a schematic cross-sectional view showing a conventional example of a molded state of a skin material and a base material.

FIG. 14 is an explanatory cross-sectional view of a joined state of a skin material and a base material showing a conventional example.

FIG. 15 is an explanatory view of cutting a skin material showing a conventional example.

FIG. 16 is an explanatory diagram of application of an adhesive for winding up a skin material showing a conventional example.

FIG. 17 is a cross-sectional view of a molded product showing a conventional example.

[Explanation of symbols]

 10 1st metal mold 10a Mold surface 10b 1st shear edge surface 10c 2nd shear edge surface 11 Passage 12 Gate 13 Base 14 Space 16 Insertion hole 17 Installation hole 18 Installation space 20 2nd mold 21 Mold surface 30 Ejector pin 31 Base End 32 Support Member 40 Welding Pin 41 Cylinder Device 50 Sliding Piece 51 Cylinder Device 52 Rod 53 Inner Tip of Mold 54 Stepped Surface 55 Welding Pin Through Hole 60 Injection Device 61 Pipeline A 1st Share Edge B 2nd Share Edge H Skin material J Melt synthetic resin K Cavity

Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display area B29L 31:58

Claims (2)

[Claims] 1. A skin integral molding apparatus comprising a first mold and a second mold facing each other to form a cavity, and injecting a molten resin between the facing molds to clamp the mold.
The die includes an ejector pin and a welding pin, and the second die
The mold includes a slide piece, the ejector pin is formed in the cavity of the second mold, and is formed on the first mold so as to project toward the second mold, and the welding pin is formed on the first mold. Placed in the cavity of the mold,
The slide piece is slidably formed on the second die side, and the slide piece is formed in the die slide direction, and the die inner tip portion of the slide piece and a direction intersecting the die slide direction at the outer position from the tip portion. Has a step surface formed on the die and a welding pin through hole formed in the die sliding direction, is connected to the sliding device, and is disposed on the die surface of the second die. A shear edge for preventing resin leakage is formed between the inner end of the die and the first die, and a shear edge for cutting the skin material is formed between the inside of the step surface and the first die. An integrated skin forming device. 2. A method of integrally molding a skin, wherein a skin material is disposed between opposing first and second molds forming a cavity, and a molten resin is injected and the mold is clamped. Holding both ends of the material, disposing a skin material between the first mold and the second mold, and supplying a molten resin;
A molding step in which the skin material and the base material are integrally molded by molding, and a skin material end portion of a predetermined length is secured, and the skin material other than the end portion and the molten resin are molded; A step of cooling and opening the mold later, a step of pressing the molded article molded in the molding step into the cavity of the second mold, and a step of arranging the skin material end portion on the back side of the molded article,
And a step of joining the disposed end portion of the skin material and the resin with a welding pin.