JPH0634917U - Resin compression molding equipment - Google Patents

Abstract

(57) [Summary] [Object] To provide a technique capable of forming a complete through hole without burrs in a molded product in a resin compression molding such as FRP without generating a weld line. [Composition] A compression molding apparatus for forming a through hole in a molded product by molding a resin inside by closing an upper mold and a lower mold, A core pin 11 which is provided on the molding side of the mold 1 so as to be able to move forward and backward and penetrates the molded product 3 in a punched state; A punching hole 20 for accommodating the core pin 11 penetrating the molded product and accommodating 31; an ejector pin 2 for ejecting a punching piece 31 accommodated in the punching hole 20 to the outside of the punching hole 20.
2 and;

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a compression molding device that provides a through hole during resin compression molding.

[0002]

[Prior art]

 When forming round holes, square holes, elongated holes, etc. during molding of FRP etc., if the flow of resin is not completely melted, a weld line will be generated around the holes and the strength will decrease and the color tone will change. In the mold of the compression molding apparatus, for example, as shown in FIG. 3, when the upper mold 40 and the lower mold 41 are closed together, the tip of the core pin 42 provided on the upper mold 40 and the inner surface of the lower mold 41. It was provided so that a gap may be formed between the and. Then, during resin molding, a thin burr 43 is formed in the gap portion, and after the mold release, a secondary process of removing the thin burr 43 is performed. In addition, there is also a method in which a hole is not formed at the time of molding and a hole is drilled at a required position after releasing the molded product from the mold.

[0003]

[Problems to be solved by the device]

 However, all of these conventional methods have a problem in that secondary processing must be performed after releasing the mold, which requires manpower and time, resulting in cost increase. In addition, if the finished surface such as the deburring surface or the cutout surface is poor, the product value will be reduced, and there will be problems such as the need to treat fine residues.

The present invention has been made in order to solve the above-mentioned conventional problems, and an object of the present invention is to completely prevent a weld line from being formed in a molded product during resin molding such as FRP. Another object of the present invention is to provide a compression molding device capable of forming a through hole.

[0005]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, in the resin compression molding apparatus of the present invention, the upper mold and the lower mold are closed to mold the resin inside, and the molding is performed by the protrusion provided on one mold. A compression molding device for forming a through hole in a product, the projection being provided on the molding side of the one mold so as to be able to move forward and backward and penetrating the molded product in a punched state; closed to the one mold. And a recess provided on the molding side of the other mold for accommodating a punched piece of a molded product and also fitting a protrusion penetrating the molded product; the punched piece accommodated in the recess is projected out of the recess And a discharging means;

[0006]

[Action]

 In the present invention, because of the above-mentioned configuration, first, the upper mold and the lower mold are closed while the protrusion is retracted into the mold, and the resin inside is compression-molded. In this case, since there is nothing that hinders the resin flow in the cavity, the resin is homogeneously filled in the cavity and no weld line is generated. After this resin is compression-molded, the protrusion is projected into the cavity and fitted into the recess, whereby the molded product is punched and the punched piece is housed in the recess. As a result, the through hole can be provided in the molded product without causing a weld line. Then, the cured molded product is released from the mold, and the discharging means is operated to discharge the punched pieces in the recess, so that the next step can be performed.

[0007]

【Example】

 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a cross-sectional view showing the mold of the present embodiment after the through holes are opened, and FIG. First, the configuration of the embodiment will be described. The compression molding die A of this embodiment is composed of a female-side upper die 1 and a male-side lower die 2.

The upper mold 1 is provided with a through hole 10 facing the lower mold 2, and a core pin 11 as a protruding portion is slidably mounted in the through hole 10. The core pin 11 is for forming a through hole 30 in the molded product 3 in the mold, and the base end portion is fixed to the core pin plate 12, and the upper mold 1 and the lower mold 2 are connected to each other. When the core pin plate 12 projects in the direction of the lower mold 2 in the closed state, the tip surface 13 is formed to have a length that fits into the lower mold 2.

The lower mold 2 is provided with a punching hole 20 as a recess for fitting the core pin 11 at a position facing the core pin 11 of the upper mold 1. The punching hole 20 is provided with a resin pool 21 having a depth substantially the same as the thickness of the molded product 3 on the tip surface 13 side in a state where the core pin 11 is fitted, and punched by the core pin 11. The scrap 31 is formed so as to be temporarily accommodated in the resin pool 21. Further, the punching hole 20 is communicated with a through hole 21a penetrating the lower die 2 in the axial direction thereof, and an ejector pin 22 as a discharging means is slidably mounted in the through hole 21a. .

Next, the operation of the embodiment will be described. With the compression molding die A of the present embodiment having the above-described configuration, first, with the core pin 11 retracted, the upper die 1 and the lower die 2 are closed to compress the resin inside. Mold. After that, the core pin 11 is projected to the lower die 2 by the core pin plate 12, and the tip end thereof is fitted into the punching hole 20.

At this time, the core pin 11 punches out the molded product 3, opens a through hole 30 in the molded product 3, fits the tip portion into the punching hole 20, and punches the punched piece 31 at the tip surface 13. The oil is put into the resin pool 21 and stored. After the resin is cured in this state, the mold is opened to release the molded product 3, and the ejector pin 22 is projected to eject the punching piece 31 from the resin reservoir 21 to remove it.

As described above, the compression molding die A of this embodiment compresses the resin in the state where the core pin 11 is retracted, so that the resin flow is hindered in the cavity. Since the resin is homogeneously filled without forming a weld line in the molded product 3, no weld line is formed. Since the through hole 30 is opened by fitting the core pin 11 into the punching hole 20 provided in the lower mold 2, no burr is generated. For this reason, after demolding, secondary processing such as deburring work is unnecessary, and the cost can be reduced. Since the punching piece 31 after the through hole 30 is opened is housed in the resin pool 21 provided in the punching hole 20, the through hole 30 can be finished precisely.

Although the embodiment of the present invention has been described above, the specific configuration of the present invention is not limited to this embodiment, and even if there are design changes and the like within the scope not departing from the gist of the invention, Included in the device.

For example, in the embodiment, the core pin 11 is provided on the upper mold 1, but the present invention is not limited to this, and the attachment method of the core pin or the like can be set arbitrarily. The shape of the mold is also arbitrary.

Although the ejector pin 22 is provided as the ejecting means, the ejecting method of the punching piece 31 is arbitrary. For example, an extruding plate that advances and retracts in the punching hole 20 is provided and is attached to the cavity side by a spring. The punching piece 31 is pushed back by being pushed by the punching piece at the time of punching, and the punching piece 31 is accommodated in the resin pool 21, and the punching piece 31 is pushed out by the biasing force of the spring as the core pin 11 moves backward. You may Alternatively, the punched pieces may be extruded with compressed air.

[0016]

[Effect of device]

 As described above, since the resin compression molding apparatus of the present invention has the above-mentioned configuration, since the molded product is punched by the protruding portion in the mold after the resin molding, a weld line is generated in the molded product. It is possible to open the through hole without causing it. No need for complicated secondary processing such as deburring work, and cost can be reduced. Since the molded product is punched out by the projecting portion in the mold and the recessed portion into which the projecting portion is fitted, it is possible to obtain an effect such as forming a through hole with precision and good finish.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a mold according to an embodiment of the present invention after a through hole is opened.

FIG. 2 is a cross-sectional view showing a mold at the time of discharging the punched piece of the same.

FIG. 3 is a cross-sectional view showing a conventional die for removing thin burrs by secondary processing after forming the thin burrs.

[Explanation of symbols]

 A Mold for compression molding 1 Upper mold 2 Lower mold 3 Molded product 11 Core pin (protruding part) 12 Core pin plate 20 Hole for punching (recess) 21 Resin reservoir (recess) 22 Ejector pin (discharging means) 30 Through hole 31 punched pieces

Claims (1)

[Scope of utility model registration request] 1. A compression molding apparatus for forming a through hole in a molded product by a protrusion provided on one mold after closing an upper mold and a lower mold to mold a resin inside the mold. A projecting portion that is provided on the molding side of the one die so as to be able to move forward and backward and that penetrates the molded article in a punched state; A resin comprising: a recess for accommodating the punched piece and fitting a protrusion penetrating the molded product; and a discharging means for ejecting the punched piece accommodated in the recess out of the recessed portion. Compression molding equipment.