JPH07195398A - Mold for perforated resin molding - Google Patents

Abstract

PURPOSE:To provide a forming mold for a perforated resin molding in which the resin molding having a prescribed shape is compression-molded without obstructing the flow of resin and also perforating work is performed in the mold. CONSTITUTION:Recesses 3, 4 are positioned oppositely to the perforating part of a resin molding and provided on the mold faces of both molds 1, 2. The upper faces 5a, 6a are positioned in the same faces as the mold faces in a time for compression-molding molten resin. A punch 5 having a cutting tooth 5b is equipped in the recess 3 of one side so as to freely rise and set by a driving cylinder 5c. A pedestal 6 driven by the driving cylinder of the punch 5 is equipped in the recess 4 of the other side so as to be freely deflected by a spring 6b.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a molding die for a perforated resin molded product which is required to be provided with an opening in order to equip an Ehan, a switch, a speaker and the like in an automobile door trim. .

[0002]

2. Description of the Related Art Generally, in order to manufacture a perforated resin molded product using a molding die, a convex portion corresponding to a hole shape is provided on a mold surface,
It is conceivable that the molten resin is injection-filled and then compression-molded on the mold surfaces of both molds. However, in this molding die, when the clearance between the upper surface of the convex portion and the other inner surface of the opposite mold is set to zero so as to perform through molding of the opening, the resin flow is blocked and the entire shape including the opening is formed into a predetermined shape. I can't.

Therefore, since it is not possible to form a hole with a forming die in practice, the opening is actually trimmed by post-processing. However, this post-processing is extremely time-consuming because it is performed after the resin molded product is completely cured, and it is difficult to make a beautiful hole if the exterior material is integrally molded, such as an automobile door trim. Accompany.

[0004]

SUMMARY OF THE INVENTION According to the present invention, a resin molded product is molded into a predetermined shape without hindering the resin flow, and
It is an object of the present invention to provide a molding die for a perforated resin molded product, which is creatively devised so that the perforating process can be performed simultaneously.

[0005]

According to the first aspect of the present invention, there is provided a molding die for a perforated resin molded product, wherein a recess corresponding to the hole shape is provided at a position corresponding to the perforated portion of the resin molded product. In addition to being provided on the mold surfaces of both molds, each upper surface that acts on the hole-forming part of the resin molded product is positioned flush with the mold surface around each recess, and one of the recesses corresponds to a hole shape. A punch having cutting teeth on the upper surface is equipped with a drive cylinder so as to project or retract from the inside of the mold to the other recess, and the spring is displaced in the other recess as the punch drives the cylinder. It is constructed by equipping a moving cradle.

In the molding die of the perforated resin molding according to claim 2 of the present invention, a detector for controlling cylinder drive for detecting that the molten resin has passed over the recess is provided below the mold surface. It is configured by

[0007]

In the mold of the perforated resin molded product according to the first aspect of the present invention, when the molten resin is injected into the mold and compression molding is performed on the mold surfaces of both molds, the punch and the pedestal are used as the mold surface. Since they are positioned flush with each other and compression-molded, the resin-molded product can be formed into a predetermined shape without hindering the resin flow. By actuating, drilling can be easily performed with cutting teeth.

In the mold for the perforated resin molded product according to the second aspect of the present invention, the punch can be operated by detecting that the resin flow has passed over the recess, and therefore the resin molding can be performed. It is possible to reliably set the punch operation timing before the product is completely solidified.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Referring to the accompanying drawings, FIG.
The forming die indicated by is a cold press provided with a fixed die 1 in which molten resin is injected and filled and a movable die 2 which moves up and down by cylinder drive. This mold can be used for resin-molding a base material of an automobile door trim or integrally molding it with a facing material, and is also configured so that a predetermined portion of the resin-molded product can be perforated.

The molds 1 and 2 are provided with recesses 3 and 4 corresponding to the shape of the holes to be drilled on the mold surface at positions corresponding to the drilled portions of the resin molded product. A punch 5 and a pedestal 6 are provided in the recesses 3 and 4, respectively. The punch 5 and the pedestal 6 are fitted into the recesses 3 and 4 so that the upper surfaces 5a and 6a acting on the hole-forming portion of the resin molded product are flush with the mold surface around the recesses. It is arranged.

The punch 5 has cutting teeth 5b corresponding to a hole shape on the upper surface 5a, and is driven to protrude from the inside of the mold to the other recess 4 by a driving cylinder 5c connected to the lower side inside the recess 3. Equipped with stroke movement to move or retract. The pedestal 6 is mounted inside the recess 4 so as to be elastically biased by a spring 6b so as to follow the protrusion or retraction of the punch 5. Further, the cradle 6 is equipped as a means for receiving the chips from the punch 5 inside the recess 4 and discharging the chips from the recess 4 together with the mold opening.

The operation timing of the drive cylinder 5c is set before the resin molded product is completely solidified, and it can be controlled by a time control that automatically operates after a predetermined time has elapsed from the start time of the compression molding. It can also be set by installing a cylinder drive control detector 7 such as a temperature sensor and a pressure sensor for detecting that the molten resin has passed over the recess 3 under the mold surface.

When the molding die of the perforated resin molding thus constructed is used, when molding a base material for an automobile door trim, an ABS resin, a polypropylene resin or the like is injected and filled in the mold as a molten resin. . When the molten resin P is injected and filled, as shown in FIG. 2, the punch 5 and the pedestal 6 are on standby such that the upper surfaces 5a and 6a are flush with the inner surfaces of the molds 1 and 2, respectively. This state is maintained until the movable die 2 descends and the molten resin P is compression-molded by the die surfaces 1a and 2a of the fixed die 1 as shown in FIG. Therefore, since the molten resin P is not obstructed by the resin flow, it can be compression molded into a predetermined shape as a resin molded product.

Before completely solidifying the molten resin P after compression molding, as shown in FIG. 4, the punch 5 is moved from the inside of the mold to the other recess 4 by the above-mentioned time control or control by the detector 7. Let Along with the protruding movement of the punch 5, the cutting teeth 5b cut out and cut the perforated portion of the resin molded product into a predetermined shape. Further, the cradle 6 moves so as to sink into the interior of the recess 4 while sandwiching the chip P ′ with the punch 5. When the mold is opened after the resin molded product is completely cured, the punch 5 is retracted to a predetermined position, and the pedestal 6 is biased to the predetermined position by the spring 6b, so that the chip P'is removed from the recess 4. After being discharged, a resin-molded product obtained by punching is obtained.

In the above-mentioned embodiment, the base material of the automobile door trim is illustrated as being compression-molded, but the present invention can be applied to the case where the covering material is assembled on the inner surface of the mold and integrally laminated. As its surface material, polyvinyl chloride (PVC) and polypropylene foam (PPF)
Laminated material, thermoplastic elastomer (TPE) and PPF
It is possible to use a laminated material with or a resin sheet such as TPE, olefin resin or ABS resin, or cloth.
Further, the present invention can be widely applied to manufacture various perforated resin molded products as well as vehicle parts.

[0016]

As described above, according to the molding die of the perforated resin molded product according to the present invention, not only the resin molded product can be formed into a predetermined shape, but also beautiful perforation processing can be performed simultaneously with the resin molding. By carrying out the above, a perforated resin molded product can be manufactured extremely efficiently.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a partial cross section of a molding die of a perforated resin molded product according to the present invention.

FIG. 2 is an explanatory view showing the injection molding and filling of a molten resin in the molding die.

FIG. 3 is an explanatory diagram showing a state of compression molding of molten resin in the molding die.

FIG. 4 is an explanatory view showing a hole forming process in the molding die.

FIG. 5 is an explanatory view showing the mold when the mold is opened.

[Explanation of symbols]

 1, 2 types 3 Recesses 5 Punch 5a Punch upper surface 5b Drive cylinder 5c Cutting teeth 6 Cradle 6a Cradle top surface 7 Cylinder drive control detector

Claims (2)

[Claims] 1. A resin-molded product is provided with a recess corresponding to a hole shape on each of the mold surfaces of the two molds at positions corresponding to the drilled parts, and each upper surface acting on the hole-molded part of the resin-molded product is formed. A punch having a cutting tooth corresponding to a hole shape on the upper surface is located flush with the mold surface around each recess, and the punch is moved from the mold to the other recess by the drive cylinder. Alternatively, a molding die for a perforated resin molded product, which is equipped so as to retreat, and a pedestal that is spring-displaced as the punch is driven by the cylinder is installed in the other recess. 2. The molding die according to claim 1, further comprising a detector for controlling cylinder drive which is provided below the die surface for detecting that the molten resin has passed over the recess.