JPH10202682A - Mold for simultaneous perforation at the time of compression molding for glass fiber reinforced thermoplastic resin sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate a plurality of processes and reduce the molding cycle, a molding space and the like by setting a seal pin for perforating the side face of a molding movably forward and backward following the up and down movement. SOLUTION: When a stampable sheet 3 as a raw material is press molded, a cam driver 4 hanging from a top mold 1 and a cam slider 5 are set facing each other, and the cam slider 5 is slid by lowering the cam driver 4 following the lowering of the top mold 1. A preceding seal pin 6 is pressed by the sliding of the cam slider 5 to actuate a return spring 8, and the seal pin is passed through a guide block 7 being in contact with a bottom mold 2 and inserted into an inserting lower perforation 13 formed into the size of the outer diameter of the preceding pin 6 plus a clearance. Then a preceding seal block 9 hanging down from the top mold 1 is lowered, and a heated stampable sheet 3 placed on the bottom force 2 is compressed and fluidized, and then cooled to manufacture a molding.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a molding die capable of forming a hole simultaneously with molding at the time of compression molding of a glass fiber reinforced thermoplastic resin sheet (hereinafter referred to as a stampable sheet). .

[0002]

2. Description of the Related Art Drilling or punching is generally used as a method of drilling a molded article using a stampable sheet as a raw material, and two steps of performing drilling after molding are required. But with conventional drilling and punching,
The glass fiber of the stampable sheet is cut off, and as a result, the strength around the hole is reduced. In addition, since a method of forming a hole by a plurality of processes causes a high cost, recently, a method of forming a hole at the time of press forming has attracted attention. However, the conventional method of forming a hole at the time of press forming is only in the breath stroke direction, and the direction of undercut with respect to the stroke direction is performed in a later step.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to provide a glass fiber reinforced thermoplastic resin sheet which can be manufactured at a low cost by eliminating a plurality of steps, reducing the number of molding cycles, molding personnel and molding space. An object of the present invention is to provide a mold for simultaneous hole drilling during compression molding.

[0004]

The means of the present invention are as follows.

[0005] A glass fiber reinforced thermoplastic resin sheet equipped with a seal pin for making a hole in a side surface or the like of a molded product when the raw material is press-molded so as to be able to move forward and backward with the vertical stroke of the upper die. Mold for simultaneous hole drilling during compression molding.

Further, in the present invention, a return spring which presses the preceding seal block when the upper mold is lowered acts on the preceding seal block for sealing the stampable sheet together with the guide block for guiding the seal pin for punching a hole in the side surface of the molded product. In addition, forming a clearance between the lower die and the guide block for bleeding air from the die is also a means for solving the problem.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a longitudinal sectional view of a molding die for forming a hole in a side portion at the same time as compression molding of a glass fiber reinforced thermoplastic resin sheet according to the present invention.
2 is a lower mold. Reference numeral 3 denotes a stampable sheet placed on the lower mold 2. A cam slider 5 is slidably provided alongside the lower mold 2 and is opposed to a cam driver 4 hung on the upper mold 1. The cam slider 5 with which the cam driver 4 lowers as the upper mold lowers is slid. I do. Reference numeral 6 denotes a preceding seal pin which is pushed by the cam slider 5, a return spring 8 is operated, and a distal end of the guide block 7 contacts the lower mold 2.
Through the lower seal, and is inserted into an insertion pilot hole 13 having a clearance added to the outer diameter of the preceding seal pin 6. A preceding seal block 9 is suspended from the upper die 1 so as to be movable up and down, and a return spring 10 is acted thereon. In the above configuration, the heated stampable sheet 3 is placed on the lower mold 2 and is compressed and flows by the descending upper mold 1. As shown in FIG. 2, before the upper die 1 starts compressing the stampable sheet 3, the guide block 7 is formed by forming a hole in a direction (for example, a side surface) where an undercut is made with respect to the press stroke direction. The tip of the penetrating preceding seal pin 6 is inserted into the insertion hole 13 of the lower mold 2 because the cam driver 4 pushes the cam slider 5. The preceding seal block 9 is also similar to the preceding seal pin 6,
Before the upper mold 1 starts compressing the stampable sheet 3, the leading end face of the preceding seal block 9 and the guide block 7
Contact with the upper surface of Thereafter, the stampable sheet 3 is compressed and flows by the descending upper mold 1 and fills the mold (see FIG. 3). At that time, the stampable sheet 3 flows around the preceding seal pin 6 and flows. The hole 12 is formed in the side surface portion. (FIG. 4) After the stampable sheet 3 is cooled in the mold, the upper mold 1 is raised and the molded product 11 is taken out. If the preceding seal pin 6 is not removed from the side hole 12, the molded product 11 can be taken out. Can not. Then, when the upper die 1 is raised, the cam driver 4 moves up together with the upper die to release the cam slider 5, so that the preceding seal pin return spring 8 also comes off from the side hole 12. (FIG. 3) Although the embodiment of the present invention has been described with respect to an example in which a hole is formed in a side surface of a molded product, the present invention can be applied to all undercut directions with respect to a stroke direction. In addition, although the leading seal pin 6 is inserted into the insertion hole 13 to perform sealing, the leading seal pin 6 is pressed against the surface of the lower mold 2 without providing the insertion hole 13 as in the example shown in FIG. Side hole 1
2 can also be formed.

Next, a mold structure in the case where a hole is not formed in the end of a molded product is as shown in FIG. The function is the upper mold 1
Depending on the shape of the molded article when compressing the stampable sheet, there are places where the stampable sheet arrives early and places where it arrives late, so it is necessary to seal at the place where the stampable sheet arrives early. Yes, the travel 21 is usually provided in the shear edge portion 20. Therefore, the shearing edge portion 20 is a clearance for releasing air and gas in the mold, and also serves as a clearance for constituting the travel 21 when the upper mold 1 is moved up and down. With such a structure, as shown in FIG. 4, a hole 12 cannot be formed in the end of the molded article in the same manner as in molding. Therefore, in the present invention, the purpose is to form a hole on the side of the molded product, so that the stampable sheet is not partially sealed at the edge portion 20 of the molded product, and the guide is partially (perforated). Sealing is performed by the block 7 and the preceding seal block 9, and the leading seal block 7
Above the return spring 10. As for the air release in the mold, a clearance 22 is formed between the lower mold 2 and the guide block as shown in FIG.

[0009]

According to the present invention, the following effects are exhibited.

(1) Since a plurality of processes are unnecessary, the molding cycle, the number of personnel and the space can be reduced, and the product cost is reduced.

(2) Since the hole is formed at the same time as the forming, there is no breakage of the glass fiber which has been generated by the conventional method (drilling or piercing), so that a decrease in strength around the hole can be prevented.

(3) Since the hole is formed in the forming die, the accuracy of the hole position and the hole shape can be easily obtained, and there is no need to forget the hole processing due to a human error.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional front view.

FIG. 2 is a vertical front view in the middle of sealing.

FIG. 3 is a vertical sectional front view when a seal is completed.

FIG. 4 is a perspective view of a part of a molded product.

FIG. 5 is a longitudinal sectional front view showing another embodiment.

FIG. 6 is a reference view showing a mold structure when a hole is not formed in a terminal of a molded product.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Upper die 2 Lower die 3 Stampable sheet 4 Cam driver 5 Cam slider 6 Leading seal pin 7 Guide block 8 Leading seal pin return spring 9 Leading seal block 10 Leading seal block return spring 11 Molded product 12 Side hole 13 Insertion pilot hole

Claims (4)

[Claims] 1. A glass fiber, which is provided with a seal pin for making a hole at the same time as forming a side portion of a molded article when press-forming a raw material so as to be able to advance and retreat along with a vertical stroke movement of an upper mold. Mold for simultaneous hole drilling during compression molding of reinforced thermoplastic resin sheet. 2. The compression molding of a glass fiber reinforced thermoplastic resin sheet according to claim 1, wherein a tip of a seal pin for making a hole in a side surface or the like of the molded product is pressed against the lower mold surface to seal. Mold for simultaneous drilling at the time. 3. The glass fiber reinforced thermoplastic according to claim 1, wherein a return spring that presses the preceding seal block when the upper mold is lowered acts on the preceding seal block that seals the stampable sheet together with the guide block that guides the seal pin. Mold for simultaneous hole drilling during compression molding of resin sheet. 4. The molding die for simultaneous hole drilling during compression molding of a glass fiber reinforced thermoplastic resin sheet according to claim 1, wherein a clearance is formed between the lower die and the guide block to release air in the die.