JPH11300761A - Apparatus for producing resin molded product - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an apparatus for producing a resin molded product having through holes in a part and a resin molded product without the through hole selectively. SOLUTION: Projections 3 for molding through holes are formed in an upper molded 1, and slide blocks 5 which move forward/backwards toward projections 3 of the upper mold 1 are installed in a lower mold 2. When a resin molding having through holes is produced, the slide blocks 5 are positioned to contact the projections 3 of the upper mold 1 with a mold closed. When a resin molded product having no through hole is produced, the slide blocks 5 are retracted from a contact position not to contact the projections 3 of the upper mold 1 with the mold closed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin molded product manufacturing apparatus for selectively manufacturing a resin molded product partially having a plurality of through holes and a resin molded product not having the through holes.

[0002]

2. Description of the Related Art FIG. 18 shows a resin molded product a partially having a through hole. This is a door trim of an automobile, and has a speaker grill c having a large number of through holes b shown in FIG. Reinforcing ribs d are provided on the inner surface of the speaker grille c by sewing between the through holes b (see FIG. 20).

FIG. 21 shows a manufacturing apparatus (die) for molding the door trim a. In the figure,
e is an upper mold, f is a lower mold main body. The upper mold e is provided with a large number of projections g for forming the through holes b, and the lower mold main body f advances and retreats toward the upper mold e. A slide block i is provided. The slide block i is provided with a large number of projections j opposed to the respective projections g of the upper die e, and a large number of air release pins k penetrate the slide block i at a portion where the rib d is formed. It is provided to be. The lower end of the air release pin k is fixed to the lower end of the slide block i. The slide block i is connected to a piston rod m of a hydraulic cylinder (not shown).

In molding the resin molded product, the slide block i is raised at the same time as lowering of the upper mold e is started in a state where the mold is opened as shown by a solid line in FIG. g is brought into contact with the projection j of the slide block i. In this state, the supply of the molten resin is started and the closing of the mold is completed by continuing the lowering of the upper mold e. At this time, the air in the cavity escapes from the gap between the air release pin k and the inner peripheral surface of the pin hole. After the molten resin is cured, the upper mold e is raised as shown in FIG. 22, and then the ejector pins (not shown) of the lower mold body f are protruded to release the resin molded product a.

On the other hand, there is a case where a speaker is not provided in the door trim a due to a requirement of a vehicle class. In this case, wind noise and road noise during running of the vehicle leak into the vehicle due to the through hole b of the speaker grill c. It will be easier. Therefore,
As shown in FIG. 23, the sound insulation cover n is fitted to a flange p projecting inward from the periphery of the speaker grille c.

[0006]

However, as described above, when a speaker is not provided due to the requirement of the vehicle size, the necessity of separately providing a sound insulating cover and the work of mounting the sound insulating cover is a factor of high cost. This is inconvenient from the viewpoint of lowering the rating and providing an inexpensive vehicle.

Accordingly, the present invention provides a resin molded product having a through hole and a resin molded product having no through hole so that it can easily cope with, for example, a case where a speaker is provided in a door trim and a case where a speaker is not provided. It is intended to be able to be selectively manufactured.

[0008]

SUMMARY OF THE INVENTION The present invention relates to a mold for forming a through-hole by contacting a slide block of a lower mold with a projection of an upper mold. Since the through-hole is not formed unless the through-hole is made to contact the protrusion of the upper die, the slide block can be positioned at a position where the slide block does not contact the above-mentioned protrusion when the through-hole is not required.

That is, the invention of this application relates to a resin molded product manufacturing apparatus for selectively manufacturing a resin molded product partially having a plurality of through holes and a resin molded product not having the through holes. An upper mold and a lower mold that form a cavity for molding a resin molded article, and a plurality of protrusions formed on a part of a molding surface of the upper mold to mold the through-hole, A slide block provided on the lower die body so as to advance and retreat toward the plurality of protrusions of the upper die,
Resin supply means for supplying the molten resin to the molding surface of the lower mold in a state where the upper mold and the lower mold are opened, closing the upper mold and the lower mold after supplying the resin, and opening the mold after the resin is cured And a slide driving unit for performing the above, and when manufacturing a resin molded product having the through hole, the slide block is positioned so as to be in contact with the projection of the upper die in the mold closed state, and the resin molded product having no through hole is provided. And a block driving means for retracting the slide block from the contact position so that the slide block does not come into contact with the protrusion of the upper mold in the mold closed state.

Therefore, when a through hole is required in the resin molded product, the slide block can be brought into contact with the projection of the upper mold in the closed state of the mold, so that the resin molded product having the through hole is formed by the projection. be able to. On the other hand, when the through-hole is not required, the slide block can be retracted from the contact position so that the slide block does not come into contact with the projection of the upper mold in the closed state. Is formed, but no through-hole is formed.

The concrete means for retracting the slide block from the contact position may be to position the cylinder block to the retracted position by the block driving means, or the support pressure of the cylinder block by the block driving means. May be set lower than the molding pressure of the molten resin, and the slide block may be retracted to a predetermined position by the molding pressure of the resin.

[0012]

As described above, according to the present invention, a plurality of projections for forming a through hole are provided on an upper mold, and a slide block which advances and retreats toward the plurality of projections of the upper mold is provided on a lower mold. When manufacturing a resin molded product having the through hole, the slide block is positioned so as to be in contact with the protrusion of the upper mold in a mold closed state, and when manufacturing a resin molded product having no through hole, the slide block is used. Is provided with a block driving means for retracting from the contact position so as not to come into contact with the protrusion of the upper mold in the closed state of the mold, so that it can be easily penetrated simply by changing the position of the slide block when the mold is closed. Resin molded products with holes and resin molded products without through holes can be selectively manufactured. Ingredients is no longer necessary, which is advantageous in improvement of productivity.

[0013]

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

FIG. 1 shows an apparatus for manufacturing the door trim (resin molded article) shown in FIGS. 18 to 20 described above.
This device can selectively manufacture a door trim having a speaker grill and a door trim having no speaker grill (having no through hole formed).

In FIG. 1, reference numeral 1 denotes an upper die, and 2 denotes a lower die. A plurality of projections 3 for forming a speaker grill are provided on a part of a molding surface of the upper die 1. On the other hand, a slide block 5 having a large number of projections 4 opposed to the projections 3 is provided on the lower mold 2 with a hydraulic cylinder (block driving means)
To move back and forth toward the upper mold 1. The lower die main body 2a is provided with a resin supply passage (resin supply means) 7 for supplying a molten resin to a plurality of portions of a molding surface thereof, and a plurality of ejector pins 8 are supported by an ejector plate 9 so as to be lower. It is provided so as to be able to protrude on the molding surface of the mold body 2a. The upper mold 1 is connected to a hydraulic cylinder (not shown) for lifting and lowering the mold to open and close the mold, and the ejector plate 9 is provided with a hydraulic cylinder (not shown) for the ejector.

-Structure of Slide Block Portion- As shown in FIG. 2, the slide block 5 includes a lower mold body 2a.
It is fitted to the up and down freely. As shown in FIG. 3, reinforcing ribs (FIGS. 13 and 1) are provided between the projections 4 of the slide block 5.
For forming the reinforcing rib d) shown in FIG. 4, a rib forming recess 12 which is deeper than other recesses is formed. Due to the formation of the rib forming concave portion 12, the forming surface for forming the speaker grilles of the two dies 1 and 2 is wider on the lower die side than on the upper die side. In other words, the door trim obtained by curing the molten resin described later has a larger adhesive force with the lower mold side than with the upper mold side, and is easily attached to the lower mold side.

A plurality of air vent holes 13 are formed at the positions of the rib forming recesses 12 so as to penetrate the slide block 5 in the forward and backward directions.
The air release pin 14 is inserted into the air conditioner. The lower end of the air release pin 14 is fixed to the lower mold body 2a via a pin plate 15, and when the slide block 5 is at a molding position where its molding surface is connected to the molding surface of the lower mold body 2a, the air release is performed. The upper end surface of the pin 14 is exposed on the bottom surface of the rib forming recess 12 to form a forming surface.

-Structure of Block Driving Means (Hydraulic Cylinder 6)-The hydraulic cylinder 6 has a structure in which the slide block 5 is formed at a forming position where the forming surface thereof is continuous with the forming surface of the lower die body 2a (a position at which a speaker grill is formed). It is driven to a forward position protruding toward the upper mold side from the molding position and a retracted position retracted in reverse. That is, the hydraulic cylinder 6 positions the slide block 5 in the forward position, the forming position, and the retreat position in order to form the door trim having the speaker grill, and moves the slide block 5 in forming the door trim without the speaker grill.
At the retracted position. Hereinafter, a specific description will be given.

-Manufacture of door trim with speaker grill-A. As shown in FIG. 2, when the upper die 1 and the lower die 2 are opened, the lowering of the upper die 1 is started, and at the same time, the slide block 5 is raised by the hydraulic cylinder 6 to be positioned at the forward position. At this time, the tip of the air release pin 14 is retracted from the bottom surface of the rib forming recess 12 as shown in FIG.

B. The lowering of the upper die 1 is continued, and the protrusions 3 of the upper die 1 and the protrusions 4 of the slide block 5 are brought into contact as shown in FIG. 4 (see FIG. 5). In this case, the projections 3 and 4 become through holes of the speaker grill.

C. The supply of the molten resin to the molding surface of the lower die body 2a is started while the lowering of the upper die 1 is continued. The supply may be started immediately before the protrusions 3 and 4 come into contact with each other. Part of the molten resin is pushed by the upper mold 1,
Since the fluid flows also around the protrusions 3 and 4 which are in contact with the slide block 5, the slide block 5 is provided with a push-up force that is not defeated by the fluid pressure.

D. While continuing to supply the molten resin, the upper die 1 is lowered to a position where a cavity for door trim is formed against the pushing force of the slide block 5, thereby positioning the slide block 5 on the molding surface ( See FIG. 6). Thereby, as shown in FIG. 7, the upper end surface of the air release pin 14 is located at the bottom surface of the rib forming concave portion 12. By this time, the supply of the molten resin is terminated. Air in the cavity escapes from the mold through a gap between the air release pin 14 and the inner peripheral surface of the air release hole 13.

E. As shown in FIG. 8, the upper die 1 is raised to release the door trim 16 from the upper die.

F. As shown in FIG. 9, the slide block 5 is retracted by the hydraulic cylinder 6 to
4 by relatively projecting the door trim 16.
Is released from the slide block 5. At this time, as shown in FIG. 10, since the air release pin 14 serves as an ejector pin, the mold release is smoothly performed.

G. As shown in FIG. 11, the door trim 16 is removed from the lower die body 2a by lowering the lower die 2 to relatively eject the ejector pins 8 or by driving the ejector pins 8 to project the eject pins. Release the mold.

Manufacture of door trim without speaker grille As shown in FIG. 12, the slide block 5 is positioned by the hydraulic cylinder 6 at a retracted position where the slide block 5 does not contact the protrusion 3 of the upper mold 1 even when the protrusion 4 is closed. Therefore, as shown in FIG. 13, the upper end of the air release pin 14 is
The slide block 5 is in a state of relatively protruding up to substantially the same height as the upper end of the projection 4.

I. Lower the upper die 1 while lowering the lower die 2
The molten resin is supplied to the molding surface a.

J. As shown in FIG. 14, the upper mold 1 is lowered to a position where a cavity for door trim is formed (mold closing). By this time, the supply of the molten resin is terminated. Air in the cavity escapes from the mold through a gap between the air release pin 14 and the inner peripheral surface of the air release hole 13.

K. As shown in FIG. 15, the upper mold 1 is raised to release the door trim 16 from the upper mold.

L. Lower the lower mold 2 to eject the ejector pins 8
The door trim 16 is released from the lower die main body 2a by relatively projecting or by driving the ejector pin 8 itself to project it. The obtained door trim 16 has no through hole in the speaker grill portion 17 as shown in FIG.

The slide block 5 is further retracted from the retracted position, as in step F when manufacturing a door trim having a speaker grill, so that the air release pin 1 is removed.
The slide block 5 may be separated from the molded product by relatively projecting the slide block 4.

However, even if the air release pin 14 is not used for releasing, since the speaker grill portion has no through-hole and has high rigidity, there is no possibility that the molded product is deformed or whitened only by releasing the ejector pin 8. It doesn't really matter.

Another Embodiment FIG. 17 shows an example in which the slide block 5 is not provided with a projection. The slide block 5 has a rib forming recess 12 which is open on a flat forming surface. An air vent hole 13 is opened on the bottom surface of the rib forming recess 12, and an air vent pin 14 is inserted into the air vent hole 13. . That is, by increasing the withdrawal angle B of the protrusion 3 of the upper mold 1 (by forming more rib-forming recesses in the slide block 5 as necessary), the adhesion force between the upper mold 1 and the resin molded product is determined. Also, the adhesion between the slide block 5 and the resin molded product can be increased, so that when the resin molded product is released from the upper mold 1, the resin molded product can be reliably left on the slide block 5 side. Things.

-Others- Although the above embodiment relates to the manufacture of a speaker grill for a door trim, the present invention is not limited to this and can be used for the manufacture of an extractor grill and the like.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing an overall configuration of a resin molded product manufacturing apparatus according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a speaker grill forming portion of the device when the through hole is formed in a state where a mold is opened and a slide block is advanced.

FIG. 3 is an enlarged sectional view showing a part of the same state.

FIG. 4 is a cross-sectional view showing the molded part in a state in which a protrusion of an upper die and a protrusion of a slide block are in contact with each other.

FIG. 5 is an enlarged sectional view showing a part of the state.

FIG. 6 is a sectional view showing the molding part in a mold closed state.

FIG. 7 is an enlarged cross-sectional view showing a part of the same state.

FIG. 8 is a cross-sectional view showing the same molded part in a state where an upper mold is raised.

FIG. 9 is a cross-sectional view showing the molding part in a state where the slide block is retracted.

FIG. 10 is an enlarged sectional view showing a part of the same state.

FIG. 11 is a cross-sectional view illustrating the same molded part in a state where a resin molded product is released from the mold.

FIG. 12 is a cross-sectional view showing a speaker grille forming part when a through hole is not formed in a mold open state and a state in which a slide block is retracted.

FIG. 13 is an enlarged cross-sectional view showing a part of the same state.

FIG. 14 is a sectional view showing the molded part in a mold closed state.

FIG. 15 is a cross-sectional view showing the molding part in a state where the upper die is raised.

FIG. 16 is a sectional view of a speaker grill portion having no through hole.

FIG. 17 is a cross-sectional view showing another embodiment.

FIG. 18 is a front view of a door trim of the automobile.

FIG. 19 is a front view showing a part of the speaker grill.

FIG. 20 is an enlarged cross-sectional view showing a part of the speaker grill.

FIG. 21 is a sectional view showing a conventional manufacturing apparatus.

FIG. 22 is a sectional view showing a state in which the upper die is raised after molding of the same device.

FIG. 23 is a sectional view showing a conventional sound insulating cover.

[Explanation of symbols]

 1 Upper Die 2 Lower Die 2a Lower Die Main Body 3 Projection 4 Projection 5 Slide Block 6 Hydraulic Cylinder (Block Driving Means) 7 Resin Supply Path (Resin Supply Means) 8 Ejector Pin 9 Ejector Plate 12 Rib Forming Recess 13 Air Vent Hole 14 Air Pin 16 Door trim (resin molding) 17 Speaker grille without through hole

Claims (1)

[Claims] 1. A resin molded product manufacturing apparatus for selectively manufacturing a resin molded product partially having a plurality of through holes and a resin molded product not having the through holes, comprising: An upper mold and a lower mold that form a cavity for molding; a plurality of protrusions formed on a part of a molding surface of the upper mold to mold the through hole; and an upper mold on a main body of the lower mold. A slide block provided to advance and retreat toward the plurality of protrusions; a resin supply means for supplying molten resin to the molding surface of the lower mold in a state where the upper mold and the lower mold are open; A mold driving means for closing the upper mold and the lower mold and opening the mold after curing the resin, and when manufacturing a resin molded product having the through hole, the slide block is closed with the upper mold in the mold closed state. Position so that it contacts the protrusion of And a block driving means for retracting the slide block from the contact position so as not to contact the protrusion of the upper mold in the closed state of the mold when manufacturing a resin molded product having no resin. Equipment for manufacturing molded products.