JP3283173B2 - Manufacturing method of structural material for groove lid - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structural material for a groove cover made of a mold steel having a concave portion, and more particularly, to a groove cover having a groove-shaped concave portion which becomes wider toward the side end face at one end side in the width direction of the steel shape. The present invention relates to a method for manufacturing a structural material.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 2, a grating is a plate made of a metal strip and formed in a lattice shape, and is used for a groove cover or the like. At the pitch between the bearing bars, the heels of high heels, canes, and tires of bicycles may be stuck and may be dangerous. In such a case, there is a type in which the number of bearing bars is increased in order to narrow the pitch between the bearing bars, but not only does the cost and weight increase, but also small stones and debris due to the narrow gap between the bearing bars. If it is clogged, it looks bad and has the disadvantage of damaging the landscape. As means for solving this problem, there is a method in which the upper surface is covered with a cosmetic material having an anti-slip function. However, there is a problem that the cosmetic material is peeled off or falls off, and the landscape is impaired.

[0004]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a method for manufacturing a groove cover structural material which eliminates the above-mentioned disadvantages and makes it difficult to remove the filler on the upper surface.

[0005]

In order to achieve the above object, a method for manufacturing a groove cover structural material according to the present invention has an inverted trapezoidal cross-section in which the width decreases as the upper part proceeds downward in hot rolling . And forming a mold steel having a concave portion having a vertical surface on the upper portion, and then using a pair of rolls, the upper portion of the shape steel
By applying indicia from are those where the configuration of forming the dovetail groove shape becomes <br/> width wide in accordance with the process proceeds to the recess downward, a shape shown in the FIGS. 1 (A) and 1 (B).

After manufacturing the grating made of the groove cover structural material, the concave portion is filled with a decorative material having an anti-slip function and hardened, so that the filling material becomes wider as the concave shape advances downward. The shape prevents it from being easily removed.

In addition, since the groove cover structural material has an inverted trapezoidal shape in which the outer cross section becomes narrower from the upper part to the lower part, it is possible to prevent stones and dust from being clogged between the members.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The method of the present invention will be specifically described below with reference to the illustrated embodiments. Figures 3 and 4 show the first
The manufacturing process example by hot rolling of the structural material for groove covers shown in FIG. First, in a first step shown in FIGS. 3A and 3B, a holding circumferential groove 1a having a groove forming circumferential groove 1b at the groove bottom of the roll R1 and a holding circumferential groove 2a of the roll R2 opposed thereto. During this time, a rectangular cross section steel 10a is inserted in a vertical shape whose main surface is perpendicular to the roll axis direction to apply a printing pressure in the width direction of the mold steel. Thereby, the shape steel 10a becomes the shape steel 10b which has the concave streak 11a of the depth d1 along the longitudinal direction on the side end surface of the width direction one end side.

Next, in the steps shown in FIGS. 4A and 4B, the shape steel 10b is placed between the rolls R3 and R4 on the same opposed peripheral surface.
Is inserted in such a manner that the main surface thereof is horizontal so that the main surface thereof is parallel to the roll direction and the upper portion 11a of the mold steel is located between the roll peripheral surface portions, and the printing pressure is applied in the thickness direction. As a result, the upper portion 11a of the mold steel 10b is narrowed from both side surfaces to become the groove 11b having an inner side.

[0010]

According to the method of the present invention, since the upper concave portion of the mold steel has a tapered groove portion which becomes wider as it goes downward, the groove filling structural material has an effect that the decorative material filled in the concave portion is hardly removed. Can be easily manufactured. In addition, when the grating is formed with the groove cover structural material, it is possible to prevent small stones and dust from being clogged, and thus has an effect of maintaining the function as landscape grating for a long time.

[Brief description of the drawings]

FIG. 1 is a structural material for a groove cover obtained by the method of the present invention.

FIG. 2 is a perspective view of a conventional groove cover.

FIG. 3 is a perspective view of a first step in one embodiment of the method of the present invention.

FIG. 4 is a perspective view of the second step.

[Explanation of symbols]

 R1, R2 Roll forming concave streak R3, R4 Roll narrowing concave streak 10 Structural material for groove cover 10a-10c Shape steel 11a, 11b recess

Claims (1)

(57) [Claims] In hot rolling, a cross-section has an inverted trapezoidal shape in which the width decreases as the upper part moves downward , and
-Type steel having a recess with a straight face, then there a width wide in accordance with the process proceeds to the recess under <br/> direction by applying indicia top of the mold steel from both the outside by a pair of rolls groove shape A method for producing a groove cover structural material, comprising: forming a groove cover;