JPH09165813A - Grating and manufacture thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a grating having a simple shape and to which effective antislipping treatment has been applied, and also to provide the manufacturing method thereof by which all the burrs can be removed at one time in the quick heating compression forming of the forming cycle, so that productivity can be greatly enhanced. SOLUTION: A grating 1 is made up of skeletal members 4 and penetrating holes 3 provided between the skeletal members 4. In the grating 1, projected parts surrounding the respective penetrating holes 3 are provided to the end peripheral parts of the skeletal members 4. In the manufacturing method of the grating, a sheet-molding compound or a bulk-molding compound is supplied inside a metal mold having a prescribed shape, and is compression-formed under heating to form the skeletal members 4 and the penetrating holes 3. The burrs produced by the compression molding are formed in the projected shape at the end peripheral parts of the respective skeletal members 4, and then they are removed while remaining within the range of 0.1mm or more and 7mm or less from the outside surface of the skeletal member 4 to form projected parts.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grating used for drainage gutter lids, mast lids, makeup lids, sidewalks, entrance mats, tree golands, etc., and its manufacturing method. Grating and its manufacturing method.

[0002]

2. Description of the Related Art Conventionally, many gratings used for drainage channel lids and the like do not consider anti-slip during walking. On the other hand, there is also one in which fine unevenness is provided on the surface of the grating to prevent slipping, but it takes a lot of time and effort to make the unevenness.

Further, as a manufacturing method of grating,
There are methods such as drilling holes in the flat plate one by one, and combining the flat plate with the cross girder for grating, etc., but it took a lot of time and effort to manufacture the plate. Further, when manufacturing a grating made of FRP, a sheet molding compound (hereinafter referred to as "SMC") or a bulk molding compound (hereinafter referred to as "BM") is used as in the past.
C ”) is fed into a half mold having a predetermined shape and compression-molded under heating, as shown in FIG. 5, there is a problem in processing the burr 12 generated in the central portion of the through hole 3. However, it takes a great deal of time to process each burr between the skeleton members 4 constituting the grating, so that a non-mold forming method such as a hand layup method or a spray up method has been adopted.

That is, since burr accompanying molding is generated in the central portion of the through hole which is the mating surface of the half mold, the burr treatment in the through hole is performed by deburring vertically in each of the through holes. There is a problem in that it must be removed using a cutter or the like for use, a man-hour corresponding to the number of through holes is required, and a great deal of labor is required.

[0005]

SUMMARY OF THE INVENTION Therefore, the present invention provides a grating having a simple shape and an effective anti-slip treatment, and removes all burrs at once in hot compression molding having a fast molding cycle. It is an object of the present invention to provide a method for manufacturing a grating which can improve the productivity and can significantly improve the productivity.

[0006]

In order to achieve the above-mentioned object, a first invention is a grating consisting of a skeleton member and a through hole provided between the skeleton members. It has a convex part that surrounds the hole.
In the method of manufacturing a grating including a skeletal member and a through hole by supplying SMC or BMC into a mold having a predetermined shape and performing compression molding under heating, burrs generated by the compression molding are disclosed. Of the skeleton member in a convex shape, and then removing burrs from the outer surface of the skeleton member in a range of 0.1 mm or more and 7 mm or less to form a convex portion, thereby producing a grating. A third invention is a method, wherein the SMC or BMC is an unsaturated polyester resin composition containing 15% or more and 55% or less of glass fibers having a cut length of 1/16 inch or more and 1 inch or less. It was done.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION In the first aspect of the present invention, since only the convex portion surrounding the through hole is provided at the end edge portion of the skeleton member constituting the grating, it can be easily manufactured and slips in rainy weather. Even if a pedestrian walks on the grating in an easy situation, the sole of the shoe catches on the convex portion, which surely prevents slipping and does not fall.

According to the second aspect of the invention, the grating is manufactured by heat compression molding with a fast molding cycle, in which case the upper die and the lower die are divided not on the central portion of the die but on the outside of the grating to be the product. , A cutter for deburring by generating burrs associated with compression molding on the outside of the skeleton member at the mating surface of the mold and leaving burrs within a range of 0.1 mm to 7 mm from the outer surface of the skeleton member. It is possible to remove the burrs protruding from the outer surface of the skeletal member at a time by leaving the protrusions that prevent slipping, and it is necessary to remove burrs for each through hole. Productivity is greatly improved because it does not exist. In this case, it is preferable that the inner angle between the inner surface of the convex burr and the outer surface of the through hole is projected to be 5 degrees or more and 90 degrees or less.

Further, the third invention is SMC or BM.
As C, an unsaturated polyester resin composition containing 15% or more and 55% or less of glass fibers having a cut length of 1/16 inch or more and 1 inch or less was used, so that even inside each grating skeleton member A large amount of glass fiber is incorporated to improve strength and appearance. Here, if the cut length of the glass fiber is less than 1/16 inch, the reinforcing effect by the glass fiber cannot be obtained, and if it is longer than 1 inch,
It becomes difficult for glass fibers to enter the inside of each lattice, and the strength and appearance of the panel deteriorate. Further, if the content of glass fiber is less than 15%, the reinforcing effect by the glass fiber cannot be obtained, and if it is more than 55%, the fluidity of SMC or BMC is deteriorated and a predetermined shape of each lattice is obtained. Becomes difficult.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing an example of the draining groove lid grating of the present invention, in which a convex portion 13 that surrounds the through hole 3 is provided at an end edge portion of a skeleton member 4 that constitutes the grating 1. The skeleton member 4 has a width d1 of 7 mm, and the through hole 3 is a rectangle having a length of 30 mm and a width of 12 mm.
Further, the convex portion 13 has a height of 0.7 mm, a width of 1 mm, and a rising angle of 15 °. The grating 1 serves as a drain groove lid in which the frame body 2 is fitted in a drain groove (not shown). Also,
FIG. 2 is a view showing a cutout portion of AA portion in FIG.

FIG. 3 is a perspective view showing a state before deburring of the grating according to the present invention, in which burrs 12 generated by the compression molding are convexly formed on the outer side of the skeleton member 4. Thereafter, the intermediate molded product is removed at once by moving a cutter (not shown) in the direction of the arrow while leaving the burr 12 at 0.7 mm from the outer surface 7 of the skeleton member 4. The remaining burr 12 finally forms the non-slip convex portion 13, and the grating 1 of the present invention is obtained. The height of the non-slip convex portion 13 can be easily adjusted by changing the deburring position.

FIG. 4 is a partial cross-sectional view showing an example of a mold used in the manufacturing method of the present invention. The intermediate molded product of FIG. 3 is made of glass fiber having a cut length of 1/8 inch. It was obtained by supplying SMC consisting of an unsaturated polyester composition containing 25% into a mold 5 and heating and 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 is composed of an upper mold 5a and a lower mold 5b, and the dividing surfaces 6 of the upper and lower molds coincide with the outer surface 7 of the skeleton member 4. The rising angle 8 of the lower die 5b on the split surface 6 is 85.
And the angle 9 to the upper die 5a is 90 degrees. Along with the heating and compression of the SMC, the SMC flows in 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. . A convex burr 12 as shown in FIG. 3 remains on the intermediate molded product taken out from the mold 5, and the inner angle between the inner surface of the burr 12 and the outer surface 7 of the skeleton member 4 is the same as that of the lower mold 5b. The raising angle is 8, that is, 85 degrees. In addition,
If the width of the cavity 10 becomes narrower as it goes downward, it becomes easier to extract from the mold.

The grating 1 of the present invention includes a drain cover,
It can be used for lids, makeup lids, sidewalks, entrance mats, tree golands, etc. The through hole 3 and the grating 1 are not limited to the quadrangle, but a rhombus,
The shape can be an arbitrary shape such as a circle or a heart shape, and the number thereof can also be set arbitrarily. Further, the height of the non-slip convex portion can be arbitrarily set as required.

[0014]

As described above, according to the grating and the method of manufacturing the grating of the present invention, the skeleton member constituting the grating is simply provided with the convex portion surrounding the through hole, which is easy to manufacture. Therefore, even if a pedestrian walks on the grating in a slippery condition such as in the rain, the soles of the shoes will be caught by the convex portions to prevent slipping and prevent the bicycle from tipping over.

Further, the grating may be SMC or BMC.
Is supplied into a mold having a predetermined shape and is integrally compression-molded under heating, so the molding cycle is faster, and the upper and lower molds are not in the center of the mold but outside the grating that will be the product. The burrs caused by the splitting and compression molding were generated in a convex shape on the outside of the skeleton member at the mating surface of the mold, and the burrs were removed from the outer surface of the skeleton member within a range of 0.1 mm to 7 mm. Therefore, it is possible to cut burrs protruding from the outer surface of the skeletal member at a time, leaving a convex portion that prevents slipping, and it is not necessary to deburr each through hole individually, so productivity is improved. Is greatly improved. Also, as SMC or BMC, the cutting length is 1/16 inch or more,
When an unsaturated polyester resin composition containing 15% or more and 55% or less of glass fibers of 1 inch or less is used, a large amount of glass fibers penetrates into each skeleton member, and the strength and appearance are improved.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a grating of the present invention.

FIG. 2 is a perspective view in which the grating of the present invention is partially cut away.

FIG. 3 is a perspective view showing a state before deburring of a grating manufactured according to the present invention.

FIG. 4 is a partial cross-sectional view showing an example of a mold used in the manufacturing method of the present invention.

FIG. 5 is a perspective view showing a state in which burrs are generated by a conventional grating manufacturing method.

[Explanation of symbols]

 1 Grating 2 Frame 3 Through Hole 4 Skeleton Member 5 Mold 5a Upper Mold 5b Lower Mold 6 Upper and Lower Mold Dividing Surfaces 7 Outer Surface of Skeleton Member 8 Lower Mold Rise Angle on Mold Dividing Surface 9 Mold Angle to the upper mold on the divided surface of the cavity 10, 11 Cavity composed of upper mold and lower mold 12 Burr 13 Convex part

Claims (3)

[Claims] 1. A grating comprising a skeleton member and a through hole provided between the skeleton members, wherein a grating portion surrounding the through hole is provided at an edge portion of the skeleton member. 2. A method for producing a grating consisting of a skeletal member and a through hole by supplying a sheet molding compound or a bulk molding compound into a mold having a predetermined shape and performing compression molding under heating. Forming a convex portion by generating a burr generated along with it in a convex shape on the edge portion of the skeleton member, and then removing the burr from the outer surface of the skeleton member within a range of 0.1 mm or more and 7 mm or less. The manufacturing method of the grating according to claim 1, wherein: 3. The sheet molding compound or bulk molding compound is an unsaturated polyester resin composition containing 15% or more and 55% or less of glass fibers having a cut length of 1/16 inch or more and 1 inch or less. The method for manufacturing a grating according to claim 2, wherein: