JPH02155709A - Injection molding method for laminate with its terminal covered with skin material and its injection mold - Google Patents

Abstract

PURPOSE:To eliminate creases on a skin material at the time of molding and mold a good laminate by deforming the skin material into the shape of the laminate after completion of molding, and then injecting the same between a skin material made of deformed molten synthetic resin and the end surface of a core main body and flow leveling. CONSTITUTION:A skin material 21 is deformed into the shape of a laminate between the surface of a core main body 10 and a cavity1 1c of a fixed mold 1 by preliminary clamping. A space for injecting molten synthetic resin is generated between the end surface of a core main body 10 and the cavity 1c of a fixed mold main body 1a. Then, when the molten synthetic resin is injected between the surface of the core main body 10 and the skin material 21 from an injection nozzle, the skin material 21 is compressed and deformed by the pressure of molten synthetic resin, and the molten resin flows out between the surface of the core main body 10 and the skin material 21 and filled therein to bond the skin material 21 and a synthetic resin base 24 together. Also, a laminate with its terminal 24a of the synthetic resin base 24 covered with the skin material 21 is molded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a method for forming a laminate (hereinafter referred to as "laminate") of a skin material made of fabric or leather, etc. and a synthetic resin base material. The present invention relates to an injection molding method for a laminate covered with a skin material and an injection mold thereof.

[Conventional technology]

Conventionally, the following injection molding molds have been used to form a laminate in which a skin material such as cloth or leather is laminated on the surface of a synthetic resin base material as an interior material for automobiles that has an elastic surface and is pleasant to the touch. something is known.

(a) Figure 8; As shown, the skin material 33 is attached to the movable mold 32.
(Japanese Patent Laid-Open No. 60-212312
(see publication).

(As shown in the old figure 9, the skin material 46 is placed on the lower mold 42, and the skin material 46 is brought into close contact with the lower mold cavity surface by suction from the vacuum hole 44 of the lower mold 42, and then the skin material 46 is placed on the lower mold 42. 4I and the lower mold 42 are closed and molten synthetic resin is injected from the sprue 43 to join the skin material 46 and the synthetic resin base material 45 (see Japanese Patent Laid-Open No. 60-212342).

[Problem to be solved by the invention]

In the above-mentioned conventional technology, a synthetic resin base material and a skin material are joined by injection molding, so a product with high joint strength can be obtained. There was also the problem that the thermoplastic resin could not be molded and the thermoplastic resin was exposed at the ends of the laminate, resulting in poor appearance. In the case shown in FIG. 9, since there is no means for treating the edges of the skin material at the same time as molding, the protruding portion of the skin material must be cut off using a knife or the like after release from the mold. During the cutting process, the edges of the skin material may be damaged and the 8th
As shown in the figure, there was a problem in that the ends of the synthetic resin base material were exposed, resulting in poor appearance.

The present invention has been made in view of the problems of the conventional techniques as described above, and it facilitates deep drawing of the skin material when injection molding a laminate in which the skin material is laminated on a synthetic resin base material. To provide an injection molding method and an injection mold for the same, which can prevent the ends of a synthetic resin base material from being exposed and simplify the end treatment process after molding by treating the edges of a skin material at the same time as molding. The purpose is to

[Means for Solving the Problems] In order to achieve the above object, the injection molding method of a laminate in which the terminal end is covered with a skin material includes a method for injection molding a laminate in which the terminal end is covered with a skin material so as to cover the cavity of the fixed mold body. A wide skin material is placed so as to protrude from the cavity at the end of the skin material, and the skin material is pressed and deformed by a movable core body, and then the skin material protrudes from the cavity at the end of the skin material. Then, a gap is formed between the front end surface of the core body and the skin material, and molten synthetic resin is injected into the gap.

Further, in the above injection molding method, it is effective to add a step of cutting the protruding end portion of the skin material after bending the protruding end portion.

Furthermore, there are two types of injection molds that are directly used in carrying out each of the above-mentioned injection molding methods, as described below.

One of them is a fixed type in which a fixed type main body having a cavity loosely fitted into a stop pin protruding from a fixed type mounting plate is supported by the fixed type mounting plate via an elastic body, and a fixed type body having a cavity that is loosely fitted to a stop pin protruding from the fixed type mounting plate; A slide core support member integrated with the support plate is provided on the push-out plate loosely fitted to the guide pin with an elastic body interposed therebetween, and a push-up plate with a push-up pin protruding between the support plate and the guide pin is provided. A core body having a shoulder portion is integrally mounted on the push-up plate via a pin, an elastic body is interposed between the core body and the support plate, and the slide The core support member is a movable type in which a slide core with a notch formed at the lower end thereof is biased toward the fixed body by an elastic body and is movable toward the core body.

The other type is the injection mold described above, in which an edge is provided protruding from the notch formed at the lower end of the slide core.

[Action J: Apply a skin material slightly wider than the width of the cavity of the fixed type main body.
The movable mold is placed so as to cover the cavity of the opened fixed mold main body, and with the end of the skin material protruding from the cavity, the movable mold is moved toward the fixed mold, and the skin material is placed on the tip of the core body. The surface presses against the cavity surface to deform it. As a result, the push-up pin comes into contact with the stop pin, so the push-up plate does not move any further, and the core body provided integrally with the push-up plate also does not move. Next, the drive means is activated to advance the slide core toward the side of the core body, bending the protruding portion of the skin material toward the core body, and folding the side and shoulder of the core body and the notch at the bottom of the tip of the slide core. Press. After that, when the movable mold is further moved toward the fixed mold, the slide core support member comes into contact with the surface of the fixed mold main body and moves this against the elastic force of the elastic body until it contacts the fixed mold mounting plate. In this case, if a notch is formed at the bottom of the tip of the slide core and an edge is provided protruding from the notch, the edge of the slide core will touch the pressed protrusion of the skin material at the shoulder of the core body. Trimming is done by digging in. On the other hand, due to the elastic force of the elastic body disposed between the extrusion plate and the slide core support member, the slide core support member comes into contact with the surface of the fixed mold body, and as the fixed mold body moves as described above, the slide core support member comes into contact with the surface of the fixed mold body. Since the support plate that is integral with the push-up plate moves at the same time, a gap is created between the push-up plate and the support plate. As a result, there is no gap between the core body and the support plate, and on the other hand, a gap is created between the tip surface of the core body and the cavity of the stationary body in which the molten synthetic resin can be injected.

Next, when molten synthetic resin is injected between the core body surface and the skin material from an injection nozzle (not shown), the skin material is compressed and deformed by the pressure of the molten synthetic resin, and the molten synthetic resin flows between the core body surface and the skin material. The skin material and the synthetic resin base material are joined together by flowing and filling, and a laminate is formed in which the ends of the synthetic resin base material are covered with the skin material. When the movable mold is opened after molding is completed, the mold is opened while the laminate is held in the movable mold, and the fixed mold main body, movable core main body, slide core support member, etc. Return to position. After retracting the slide core, the projecting pin is pushed out to release the laminate.

In the present invention, a laminate in which cloth or the like is laminated on one or both sides of fabric, leather, or polyurethane foam is used as the skin material.

〔Example] Examples will be described with reference to the drawings.

First, an embodiment of an injection mold according to the present invention will be described with reference to FIG.

The injection mold includes a fixed mold 1 and a movable mold 2, each of which is attached to a fixed plate or a movable plate of an injection molding machine (not shown). The fixed mold l consists of a fixed main body ]a guided movably in the axial direction by a fixed guide pin 22 and a stop pin 23 protruding from the fixed mold mounting plate 4, and the fixed main body 1a A cavity 1c is formed in the cavity 1c.

An elastic body, such as a spring Ib, disposed between the fixed body 1a and the fixed mounting plate 4 is biased to create a gap C between the two. On the other hand, the movable mold 2 includes an extrusion plate 6 that is loosely fitted onto a guide pin 5 protruding from the mounting plate 3 and is movable in the axial direction.
A projecting pin 11 is provided protruding near the center, and return pins 7 are provided protruding from both sides of the projecting pin 11. Also, mounting plate 3
An appropriate number of spacers 25 are provided on the extrusion plate 6 side surface. A push-up plate 8 is loosely fitted into the return pin 7, and push-up pins 9 are provided protruding near both sides of the push-up plate 8. Further, a core mounting pin 20 is protruded near the center of the push-up plate 8, and a core body 10 having a shoulder portion 10b is integrally fixed to the tip thereof. The core body 10 is biased toward the fixed mold 1 by a spring loa disposed between the core body 10 and the support plate 12, so that a gap A is created when the mold is opened. The protruding pin 11 is connected to the push-up plate 8. It extends through the support plate 12 and the core body 10 and has a length that becomes the cavity surface of the core body 10 when mold clamping is completed.

Furthermore, a support plate 12 loosely fitted to the core mounting pin 20, return pin 7, push-up pin 9, and ejection pin 11 is disposed between the push-up plate 8 and the core body IO, A slide core support member 13 is integrally provided on the surface of the core body IO side. A spring 6 is provided between the extrusion plate 6 and the slide core support member 13.
a is disposed, and the support plate 12 and the slide core support member 13 are biased toward the fixed die l with respect to the extrusion plate 6 by the spring 6a. Further, the slide core support member 13 has a guide hole 13a in the center thereof into which the base of the core body 10 is slidably fitted, and a step in which the slide core 14 is disposed following the guide hole +3a. A thick inner portion 13 is formed on the outside of the portion 13b.
The thick portion +3c has a through hole into which the push-up pin 9 and return pin 7 are loosely fitted. Even thicker inside! For example, a hydraulic cylinder 16 is provided as a driving means on the outer wall of 3c, and a rod 18 connected to a piston 17 is moved from the outer wall to the stepped portion 1.
3b, and is loosely fitted into the opening of the hydraulic cylinder 1.
It can move forward and backward by applying hydraulic pressure to both sides of the piston 17 of No.6. A guide member 19 is fixed to the tip of the rod 18, and the guide member 19 is fitted into a guide groove 14a of the slide core 14, which has a notch 14c with an edge +4b projecting therefrom. A guide plate 15 is provided facing the step portion 13b and movable in a direction perpendicular to the surface of the step portion 13b by appropriate means.
A spring 15a is disposed between the guide plate 15 and the slide core support member 13 to urge the guide plate 15 and the slide core 14 in the direction of the fixed mold 1, and a gap B is created between them. There is. Further, on the surface of the guide plate 15 facing the fixed die 1, the slide core 14 is disposed by appropriate means so as to be movable forward and backward toward the core body IO.

Next, a molding process as an embodiment of the injection molding method of the present invention will be described.

As shown in FIG. 1, a skin material 21 slightly wider than the width of the cavity lc of the fixed mold main body 1a is placed on the opened fixed mold 1, and the end of the skin material 21 is inserted into the cavity so as to cover the cavity 1c. 1c and move the movable mold 2 toward the fixed mold 1 as shown in FIG. 2 to perform preliminary mold clamping.
This is to temporarily stop the process while maintaining the values of and C. By tightening this child 07ff mold, the skin material 2! is deformed into the shape of a laminate between the surface of the core body 10 and the cavity 1c of the fixed mold 1. Next, as shown in FIG. 3, the hydraulic cylinder 16 is actuated to advance the slide core 14 toward the core body 10 via the piston 17 and rod 18, and the protruding portion 21a of the skin material 21 is inserted into the core body IO. Bend it to the side and press the protruding end 21a with the notch +4c having an edge 14b for trimming the slide core 14, the side wall of the core body 10, and the shoulder 14b.

Then, as shown in FIG. 4, the movable mold 2 is further replaced with the fixed mold 1.
Move it in the direction of and complete the mold clamping.

By the complete mold clamping, the slide core support member 13 comes into contact with the surface of the fixed mold body 1a and is moved until the gap C between it and the fixed mold mounting plate 4 disappears. At the same time, the edge +4b of the slide core 14 bites into the pressed protruding portion 21a of the skin material 21 at the shoulder portion 10b of the core body IO, thereby performing trimming. During this time, the push-up pin 9 is in contact with the stop pin 23, so the push-up plate 8 does not move, and the core body 10 integrally provided therewith also remains stationary. On the other hand, a spring 6a disposed between the extrusion plate 6 and the slide core support member 13
is compressed, and due to its elastic force, the slide core support member 13 comes into contact with the surface of the fixed mold body 1a, and moves along with the movement of the fixed mold body 1a, and the support plate 12, which is integral with this, also moves. Then, the push-up plate 8 and the support plate 12
There will be a gap between the two. As a result, the gap A between the core body IO and the support plate 12 is eliminated. This complete mold clamping creates a gap between the tip surface of the core body 10 and the cavity lc of the fixed mold body 1a in which the molten synthetic resin can be injected.

Next, as shown in FIG. 5, when a molten synthetic resin is injected between the surface of the core body IO and the skin material 21 from an injection nozzle (not shown), the skin material 21 is compressed and deformed by the pressure of the molten synthetic resin, and the core Molten resin flows and fills between the surface of the main body IO and the skin material 21, and the skin material 21 and the synthetic resin base material 24 are joined, and the terminal 2 of the synthetic resin base material 24 is joined.
A laminate in which 4a is covered with the skin material 21 is molded. During injection, the core body 10 is supported by the guide pin 5 via the push-up plate 8. After the molding is completed, when the movable mold 2 is opened as shown in FIG. 6, the above-mentioned gaps △, B and C (not shown) are closed while the fJ1 layer body 26 is still held in the movable mold 2. arise. Next, as shown in FIG. 7, after retracting the slide core 14, the extrusion plate 6 is moved in the direction of the fixed mold l by a driving means (not shown), thereby ejecting the ejecting pins 11 and releasing the molded laminate 26. Release the mold.

In the injection mold described above, when the length (distance) of the gap A is made larger than the sum of the lengths of the gap C and the length of the gap B, the protruding portion 21a of the skin material 21 can be trimmed more reliably. I can do it.

In addition, there is a notch at the bottom of the tip of the slide core 14 mentioned above.
4c and an edge 14b protruding from the notch 14c, it is also possible to use a movable type having a slide core with only a notch formed at the lower end of the slide core, although not shown. When using this movable type,
The ends of the skin material are only bent and not cut.

〔Effect of the invention〕

Since the present invention is configured as described above, it produces the effects described below.

In the invention according to claim 1, after the skin material is deformed into the shape of the laminate after molding is completed, a molten synthetic resin is injected between the deformed skin material and the surface of the tip of the core body. Since it is spread out, wrinkles do not occur in the skin material during molding, and a good laminate can be molded. In addition, since the protruding part of the skin material is bent toward the core body side, the end of the synthetic resin base material is completely covered with the skin material, and the end of the synthetic resin base material is not exposed, resulting in a good-looking lamination. can form a body.

In the invention according to claim 2, in addition to the above effects, 1
Since the end treatment including trimming of the skin material of the molded article is performed during the second molding cycle, there is no need for laborious end treatment after molding as in the prior art.

In the invention according to claim 3, most of the steps of the injection molding method according to claim 1 can be performed by the clamping operation of the injection mold, so that it is possible to perform the injection molding method according to claim 1. suitable.

In the invention set forth in claim 4, most of the steps of the injection molding method set forth in claim 2 can be carried out by the clamping operation of the injection mold. suitable.

[Brief explanation of the drawing]

FIGS. 1 to 7 are sectional views showing half of an injection mold in each step of the injection molding method of the present invention, and FIGS. 8 to 9 are sectional views showing a conventional injection molding method, respectively. 1...Fixed type, 1a...Fixed type main body,
ib...spring, lc...cavity, 2...movable type, 3...mounting plate,
4...Fixed mounting plate, 5...Guide pin,
6... Push-out plate, 6a... Spring, 7... Return pin, 8... Push-up plate,
9... Push-up pin, 10... Core body,
Oa...Spring, IOb...Shoulder, 1.
...Ejecting pin, 12...Support plate, 3...
...Slide core support part, 3a...Guide hole, +3h...Step part, 3c
...Thick wall part, 14...Slide core,
4a...Guide groove, +4b...Edge, 4
c...notch, 5...information board, 5a...
... Spring, 16 ... Hydraulic cylinder, 7
...Piston, 18...Rod, 9.
... Guide member, 20 ... Core mounting pin, 2
DESCRIPTION OF SYMBOLS 1...Skin material, 21a...Protrusion part, 22...Fixed guide pin, 23...Stop pin, 24...Synthetic resin base material, 24a...Terminal, 26 ...Laminated body.

Claims (1)

[Claims] 1. To cover the cavity (1c) of the fixed main body (1a), a skin material (21
), and the end of the skin material (21) is inserted into the cavity (1c).
), and after the skin material (21) is pressed and deformed by the core body (10) of the movable mold (2), the skin material (21) is placed so as to protrude from the cavity (1c). The protruding portion (21a) is attached to the core body (10).
) side, and then a gap is formed between the surface of the tip of the core body (10) and the skin material (21), and molten synthetic resin is injected into the gap. A method for injection molding a laminate. 2. The injection molding method of a laminate whose terminal end is covered with a skin material according to claim 1, further comprising a step of cutting the protruding part (21a) of the skin material (21) subsequent to bending the protruding part (21a). . 3. Stop pin (23) protruding from the fixed mounting plate (4)
) with a cavity (1c) loosely fitted into the fixed body (
1a) supported by the fixed mounting plate (4) via an elastic body (1b); and an extruded plate loosely fitted into a guide pin (5) protruding from the mounting plate (3). (6) with an elastic body (6a) interposed between the support plate (
12), and a push-up plate (8) with a push-up pin (9) protruding between the support plate (12) and the guide pin (5). established,
A core body (10) having a shoulder portion (10b) is integrally provided on the push-up plate (8) via a core attachment pin (20), and the core body (10) and the support plate (12) are connected to each other. An elastic body (10a) is interposed between the slide core support member (13), and a notch (14c) is provided at the lower tip of the slide core support member (13).
A slide core (14) formed with a slide core (14) is biased toward the fixed mold main body (1a) by an elastic body (15a), and the movable mold 2 is arranged so as to be movable toward the core main body (10). A laminate injection mold whose ends are covered with a skin material. 4. Claim 3, wherein an edge (14b) is provided protruding from the notch (14c) formed at the bottom of the tip of the slide core (14).
An injection mold of a laminate in which the described terminal is covered with a skin material.