JP3283151B2 - Method of manufacturing panel with through hole - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to ventilation holes, handrails, gates,
The present invention relates to a method for manufacturing a panel with a through hole used for a fence / wall material, a sunshade, a window, a space deck, and the like, and particularly to a method for manufacturing a panel with a through hole suitable for obtaining a grid-like panel.

[0002]

2. Description of the Related Art Conventionally, as a method of manufacturing a panel with through holes, there are a method of drilling holes one by one in a flat plate, a method of combining a flat plate with a crossbeam to obtain a grid-like panel, and the like.
The production required a great deal of trouble.

[0003] Further, when manufacturing a panel made of FRP,
As before, sheet molding compound (hereinafter referred to as "SMC") or bulk molding compound (hereinafter referred to as "BMC") is supplied into a half mold having a predetermined shape, compression molded under heating and with through holes In the panel manufacturing method, as shown in FIG. 6, there is a problem in the treatment of burrs 12 generated in the central portion of the through-hole 3. Particularly, when manufacturing a grid-like panel, the space between the frame members 4 serving as a grid is increased. Since the processing of each burr requires a great deal of labor, a non-molding method such as a hand lay-up method or a spray-up method has been employed.

That is, since burrs due to molding are generated at the center of a through hole which is a mating surface of a half mold, deburring in the through hole is performed in each of the through holes in a vertical direction. However, there is a problem that the number of man-hours corresponding to the number of through-holes is required, and particularly in the case of a grid-like panel, much labor is required.

[0005]

SUMMARY OF THE INVENTION Accordingly, the present invention is directed to a panel with a through-hole capable of removing all burrs at once in a hot compression molding with a rapid molding cycle and greatly improving productivity. It is intended to provide a manufacturing method.

[0006]

In order to achieve the above object, a first aspect of the present invention is to supply SMC or BMC into a mold having a predetermined shape, and compression-mold under heating to penetrate the skeleton member. In a method of manufacturing a panel with through holes comprising holes, a method of manufacturing a panel with through holes, in which burrs generated during compression molding are generated in a convex shape outside the skeleton member, and thereafter, deburring is performed. A method according to a second aspect, wherein the SMC or the BMC has a cut length of 1/16.
15% or more of glass fiber of 1 inch or more and 1 inch or more,
This is an unsaturated polyester resin composition containing 35% or less.

[0007]

According to the first aspect of the present invention, a panel with a through-hole is manufactured by heat compression molding with a high molding cycle, and the upper and lower dies are not formed at the center of the mold but at the panel with the through-hole. And burrs caused by compression molding are generated in a convex shape outside on the mating surface of the mold outside the skeletal member. Then, if a cutter or the like for deburring is moved along the surface portion of the skeleton member having the burrs, the convex portion projecting from the outer surface of the skeleton member can be cut at a time. Therefore, it is not necessary to remove each of the through-holes, so that the productivity is greatly improved.
In this case, it is preferable that the protrusion is formed so that the inner angle between the inner surface of the convex burr and the outer surface of the skeleton member is not less than 5 degrees and not more than 90 degrees.

The second invention uses an unsaturated polyester resin composition containing 15% or more and 35% or less of glass fibers having a cut length of 1/16 inch or more and 1 inch or less as SMC or BMC. Therefore, particularly in a lattice-like panel, a large amount of glass fiber penetrates into the inside of each lattice, and the strength and appearance are improved. Here, if the cut length of the glass fiber is less than 1/16 inch, the reinforcing effect of the glass fiber cannot be obtained, and if it is longer than 1 inch, the glass fiber hardly enters the inside of each lattice, Panel strength and appearance are reduced. If the glass fiber content is less than 15%, the reinforcing effect of the glass fiber cannot be obtained, and if it is more than 35%, SMC or BM
The fluidity of C deteriorates, and it becomes difficult to obtain a predetermined shape of each lattice.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing a state before deburring of a panel with through holes manufactured according to the present invention,
The burrs 12 generated due to the compression molding are protruded outside the skeleton member 4. This intermediate product is thereafter moved by moving a cutter (not shown) in the direction of the arrow,
The burrs 12 are removed at one time along the outer surface 7 of the skeletal member 4, and finally a panel with through holes is obtained.

FIG. 2 is a partial sectional view showing an example of a mold used in the manufacturing method of the present invention. The intermediate molded product shown in FIG. 1 is made of glass fiber having a cut length of 1/8 inch. It is obtained by supplying SMC comprising an unsaturated polyester composition containing 25% into a mold 5, and performing heat compression molding under the conditions of a temperature of 140 ° C., a pressure of 50 kg / cm ² , and a holding time of 5 minutes.
The mold includes an upper mold 5 a and a lower mold 5 b, and the upper and lower mold divided surfaces 6 coincide with the outer surface 7 of the skeleton member 4. The rising angle 8 of the lower mold 5b on the division surface 6 is 60
The angle 9 to the upper die 5a is 75 degrees. With the heating and compression of the SMC, the SMC flows into the cavities 10 and 11 formed by the upper mold 5a and the lower mold 5b, and the skeleton member 4 is formed by the cavity 10 and the burr 12 is formed by the cavity 11. . In the intermediate molded product taken out from the mold 5, a convex burr 12 as shown in FIG. 1 remains, and the inner angle between the inner surface of the burr 12 and the outer surface 7 of the skeleton member 4 is determined by the height of the lower mold 5b. The raising angle is 8, that is, 60 degrees. In addition,
If the width of the cavity 10 is reduced as it goes downward, it is easy to extract the cavity 10 from the mold.

FIG. 3 is a perspective view showing the panel 1 with through holes obtained by the manufacturing method of the present invention, as viewed from the side of the intermediate molded product of FIG. 1 from which the burrs 12 have been removed. FIG. 1 corresponds to the AA cross section of FIG.
A grid-like panel provided with a plurality of square through holes 3 each having a square of 12 mm by a frame member 4 having a width d1 of 7 mm.

As shown in FIG. 4, the panel 1 with through holes includes a ventilation hole 13 for a detached house or the like, and a handrail 1 of a balcony.
4, gate 15, fence 16, awning 17, space deck 18
Etc. can be used. In addition, the through-hole 3 is not limited to a quadrangle, but may be an arbitrary shape such as a rhombus, a circle, and a heart, and the number thereof may be arbitrarily set.

In connecting the panels with through holes according to the present invention, as shown in FIG. 5, the frame 2 is divided into two parts in the depth direction to form the connection parts 19, 19 so that the connection parts are not conspicuous. It is preferable to match or to make the width of the frame 2 of the panel 1 with the through-hole half and abut each other.

[0014]

As described above, according to the method of manufacturing a panel with a through hole of the present invention, SMC or BMC is supplied into a mold having a predetermined shape, and is integrally compression-molded under heating. Since the molding cycle became faster and burrs due to compression molding were generated in a convex shape outside the skeletal member, the convex parts protruding from the outer surface of the skeletal member at once without using a special jig Cutting can be performed, and since it is not necessary to deburr each section in the through hole, productivity is greatly improved. Also, SMC or BM
When an unsaturated polyester resin composition containing 15% or more and 35% or less of glass fibers having a cut length of 1/16 inch or more and 1 inch or less is used as C, particularly, production of a grid-like panel with through holes is used. In the method, a large amount of glass fiber penetrates into the inside of each lattice, and the strength and appearance are improved.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a state before a deburring of a panel with through holes manufactured by the present invention.

FIG. 2 is a partial cross-sectional view illustrating an example of a mold used in the manufacturing method of the present invention.

FIG. 3 is a perspective view showing a panel with through holes obtained by the manufacturing method of the present invention.

FIG. 4 is a perspective view showing an example of using a panel with through holes obtained by the manufacturing method of the present invention.

FIG. 5 is a perspective view showing an example of a connecting portion of a panel with a through hole obtained by the manufacturing method of the present invention.

FIG. 6 is a perspective view showing a state in which burrs are generated by a conventional method for manufacturing a panel with through holes.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Panel with through hole 2 Frame 3 Through hole 4 Skeletal member 5 Die 5a Upper die 5b Lower die 6 Dividing surface of upper and lower dies 7 External surface of skeleton member 8 Lowering angle of lower die in dividing surface of die 9 Angle to the upper mold at the split surface of the mold 10, 11 Cavity composed of upper mold and lower mold 12 Burr 13 Ventilation hole of detached house 14 Balcony handrail 15 Gate 16 Fence 17 Sunshade 18 Space Deck 19 Connection part of panel with through hole d1 Width of skeletal member

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B29C 43/36 B29C 43/02 B29C 37/02

Claims (2)

(57) [Claims] 1. A method for producing a panel with a through-hole comprising a skeleton member and a through-hole, comprising supplying a sheet molding compound or a bulk molding compound into a mold having a predetermined shape, and compression-molding under heating. A method for manufacturing a panel with a through hole, comprising: generating burrs generated by compression molding on the outside of the skeletal member in a convex shape, and then performing deburring. 2. The unsaturated polyester resin composition according to claim 1, wherein the sheet molding compound or the bulk molding compound contains 15% to 35% of glass fibers having a cut length of 1/16 inch to 1 inch. The method for manufacturing a panel with through holes according to claim 1, wherein: