JPH0532270Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Purpose of the Invention] (Field of Industrial Application) The present invention relates to an in-mold decorative molding device for molding a synthetic resin molded product having a skin material such as an interior material for a vehicle.

(Prior art) Conventionally, when molding a synthetic resin molded product with a skin material integrally provided on the surface, for example,
As shown in the publication, a large number of suction holes are provided on the mold surface of the mold, and the suction holes absorb the skin material and hold it on the mold surface, as well as inside the cavity of the mold when the mold is closed. A synthetic resin material is introduced into the surface and molded integrally with the skin material.

(Problems to be Solved by the Invention) In the above-described molding apparatus, so-called blank casting is performed in order to determine the amount of synthetic resin to be supplied as a base material. In other words, before starting production, try molding with the calculated injection amount and test several times to see whether the synthetic resin fills every corner of the cavity and whether burrs appear. is decided.
During this test, if a large amount of synthetic resin is supplied, the synthetic resin may overflow from the mold mating surface in the form of burrs, and this overflowing synthetic resin may enter the suction hole, but in this case, the suction hole may become blocked. Not only will this cause heat build-up, but it may also damage the suction device for generating negative pressure, which is connected to the suction hole.

In addition, when using an expensive skin material, in the above test, setting the skin material is omitted during trial and error, and the skin material is only set in the final stage of adjustment, but if there is no skin material, When molding, synthetic resin enters the suction hole, so testing without a skin material cannot be performed.

The present invention is an attempt to solve the above-mentioned problems, and aims to prevent the synthetic resin from entering into the suction opening that holds the skin material in place.

[Structure of the idea]

(Means for Solving the Problems) The present invention involves setting a skin material on the mold mating surface of a closed mold, introducing a synthetic resin material into the cavity of the mold, and molding it integrally with the skin material. In the in-mold decorative molding apparatus, an opening for suction of the skin material is provided on the mold mating surface of the mold, and the mold mating surface having the suction opening and the mold mating surface opposite thereto. At least one of the molds is provided with an elastic body that is pressed against the periphery of the suction opening when the mold is closed.

(Function) In this invention, a skin material is set on the mold mating surface of a closed mold, and a synthetic resin material is introduced into the cavity of the mold for molding. When no material is used, that is, in a mold closed state without a skin material, the elastic body of each suction opening deforms elastically to prevent synthetic resin from entering the suction opening.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

In FIG. 1, reference numeral 11 denotes a molding die, and this molding die 11 consists of a fixed die 14 as a female die and a movable die 15 as a male die, which are attached to mounting plates 12 and 13, respectively. The fixed mold 14 is fixed to a molding machine main body (not shown) via a mounting plate 12 with a plurality of clamps 16, and the movable mold 15 is supported so as to be movable towards and away from the fixed mold 14.

The fixed mold 14 has two recesses 17 for forming cavities formed on the mold matching surface, a spool 18 bored in the center, and a spool 18 around the recesses 17 on the mold matching surface. A plurality of suction openings 19 are provided in the part, and a suction device 22 such as a vacuum pump is connected to each suction opening 19 through a through hole 20 and a conduit 21 provided in the fixed mold 14. There is.

Further, a cylindrical elastic body 23 made of hard urethane, nylon, hard rubber, etc. is provided for each of the suction openings 19. That is, as shown in FIG. 10, a metal joint tube 24 is embedded and fixed in the suction opening 19 of the fixed mold 14 by screwing or the like, and the joint tube 24 formed on the outside of the joint tube 24 is formed on the fixed mold 14. The elastic body 23 is fitted into the concave stepped portion 25, and a metal stopper tube 26 is screwed onto the exposed portion of the joint tube 24, and the flange portion 2 of the stopper tube 26
7 fixes the elastic body 23, and this elastic body 2
The end portion 3 protrudes a predetermined length from the mold matching surface. Further, as shown in FIG. 1, guide pins 28 are provided protruding from the four corners of the mold mating surface of the fixed mold 14.

The movable mold 15 has convex portions 31 for forming cavities corresponding to the respective recesses 17 protruding from the mold mating surface, and the central portion corresponding to the spool 18 communicates with the surface of each convex portion 31. Runner 3
2 is formed, and a cylindrical elastic sealing material 34 is provided at the opening of the runner 32 corresponding to the spool 18. Furthermore, guide holes 33 corresponding to each of the guide pins 28 are bored in the mold matching surface.

Further, as shown in FIG. 2, a skin material supply tool 35 is provided between the fixed mold 14 and the movable mold 15 so as to be movable up and down and back and forth. This skin material supply tool 35 has a base frame 37 at the lower end of the vertically movable rod 36.
A plurality of suction pads 38 are provided on the surface of the base frame 37 facing the fixed mold 14, and a pipe line 39 communicating with a suction device (not shown) is connected to each suction pad 38.

In FIGS. 2 and 3, 41 is a skin material, and this skin material 41 has an area that covers the two recesses 17 of the fixed mold 14, and a notch hole 42 is formed in the vertical direction in the center part. ing.

Then, during molding, as shown in FIG. Then, as shown in FIG. bring it into contact with. At the same time, a negative pressure is generated by the suction device 22, and the skin material 41 is suctioned and held in each suction opening 19, and the skin material 41 is placed on the mold mating surface of the fixed mold 14.
Set the front surface side toward the recess 17 side.
When suction of the skin material 41 to the fixed mold 14 is completed, the suction of the suction pad 38 of the skin material supplying tool 35 is stopped, and the skin material supplying tool 35 separates from the fixed mold 14, rises, and retreats. Next, the movable mold 15 moves forward toward the fixed mold 14, closes the mold via the skin material 41, and stops suction from the suction opening 19 by the suction device 22, as shown in FIGS. 6 and 7. do. In addition, in this state, the injection cylinder 44 of the molding machine main body moves forward, and as shown in FIG.
An injection cylinder 44 is connected to a, injects thermoplastic synthetic resin 45, and transfers this to the spool 18 and the skin material 4.
1 notch hole 42 and movable mold 15 runner 32
The synthetic resin 45 is introduced and filled into the cavity formed by the recess 17 and the protrusion 31 through the
A molded product with a skin material 41 provided on the surface thereof is integrally molded, and unnecessary portions of the skin material 41 are removed.

During the above molding, when the fixed mold 14 and the movable mold 15 are closed with the skin material 41 sandwiched between them, the first
As shown in Figure 1, the elastic body 23 of each suction opening 19
is elastically deformed by a.

Since a cylindrical elastic sealing material 34 is pressed and held around the spool 18 between the fixed mold 14 and the movable mold 15, the synthetic resin 45 does not enter the front side of the completely sealed skin material 41. Instead, it goes around to the back side via the runner 32.

In addition, in a dry firing test prior to production, the skin material 4
1 is not used, that is, in the mold closed state without the skin material 41 as shown in FIG. 12, the elastic body 23
The amount of deformation is small due to the absence of the skin material 41, but it is deformed by a predetermined amount b, and the end of the elastic body 23 is pressed against the mold matching surface of the movable mold 15, so that This prevents the synthetic resin 45 from entering.

As described above, during the dry firing test of the synthetic resin 45, the synthetic resin 45 does not enter the suction opening 19, and the fixed mold 14 and the suction device 22, for example, are not damaged by vacuum suction. Further, due to the elastic deformation effect of the elastic body 23, it is possible to reliably cope with the case where skin materials 41 having different thicknesses are used. In addition, when the elastic body 23 comes into contact with the opposing mold surface,
The fixed mold 14 and the movable mold 15 are not damaged.

In addition, in implementation, the elastic body 23 is fixed type 1
In addition to being provided around each suction opening 19 of 4, it may be provided on the mold matching surface of the movable mold 15 facing each suction opening 19, and furthermore, it may be provided on the mold matching surface of the movable mold 15 facing each suction opening 19. A convex body and a concave receptor may be installed on both sides.

[Effect of idea]

According to the present invention, a skin material is set on the mold mating surface of a mold, and a synthetic resin material is introduced into the cavity of the mold and molded integrally with the skin material. At this time, the sealing effect caused by the deformation of the elastic body prevents the synthetic resin from entering the suction opening, preventing damage to the vacuum equipment, etc.
Further, due to the elastic deformation effect of the elastic body, it is possible to reliably cope with the use of skin materials of different thicknesses.

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view showing one embodiment of the device of the present invention, Fig. 2 is a perspective view of a part of Fig. 1, Fig. 3 is a perspective view of the skin material, and Figs. 4 to 8 are Figures 4, 5 and 6 are cross-sectional views of the forming process.
Cross-sectional view corresponding to section A-A, Figures 7 and 8
The figure is a sectional view corresponding to the part B-B in Fig. 1, Fig. 9 is a sectional view of the molded product, and Figs.
FIG. 3 is a sectional view of the suction opening shown in the figure. 11... Molding mold, 19... Adsorption opening, 23
...Elastic body, 41...Skin material.

Claims (1)

[Claims for Utility Model Registration] In-mold decoration in which a skin material is set on the mating surface of a closed mold, and a synthetic resin material is introduced into the cavity of the mold and molded integrally with the skin material. In the molding device, an opening for suction of the skin material is provided in a mold matching surface of the mold, and the above-mentioned An in-mold decorative molding device characterized in that an elastic body is provided that is pressed around the suction opening when the mold is closed.