JP2779577B2 - Anti-slip construction steel - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the application of a non-slip construction to the surface of a steel material (stainless steel or steel plate, etc.) used for a lid of a wastewater gutter or the like.

[0002]

2. Description of the Related Art Conventionally, striped steel plates and gratings have been used as lids for wastewater ditches and the like, and striped steel plates have been used for stairs. Although the surface of this striped steel plate is somewhat uneven, it does not sufficiently play a role of preventing slip when rain accumulates.
Further, since the grating has a flat surface, as shown in FIG. 5 (showing a partial plane of the grating) and FIG. 6 (showing a cross section BB in FIG. 5) as slip prevention measures,
For example, a triangular continuous pattern formed by press working is used.

[0003]

As described above, even if a striped steel plate is used for a lid of a wastewater gutter or the like, or a grating having an uneven portion formed on the surface by press working is used, it is still possible to prevent slippage. Not enough. As shown in the cross section of FIG. 6, even if the concave groove is formed by press working, the unevenness is uniformly formed and the sharp convex portion is not formed, so that it is impossible to increase the frictional resistance. Even if a shoe is tested for slippage, it is not enough to prevent slippage. Therefore, the present invention provides a steel material which can be easily subjected to anti-slip work and sufficiently prevents slip.

[0004]

According to the present invention, a steel material surface is irradiated with a laser beam to form a sharp, fine uneven pattern.
Is what it does.

[0005]

When the surface of the steel material is irradiated with the laser beam, the irradiated steel material is melted, the melted portion becomes a concave portion, and two convex portions are formed on both sides of the concave portion. The shapes (patterns) of the projections, depressions, and projections formed in this manner are arbitrary and fine and sharp, have high frictional resistance, and are different from the projections and depressions formed by press working. Demonstrate improvement.

[0006]

FIG. 1 shows a grating (made of SUS304) 1 used as a lid for a wastewater gutter, etc. FIG. 2 shows an enlarged part of various patterns formed on the surface of the grating by irradiating a laser beam to be described later. FIG. 3 is a plan view of FIG.
A section is shown. The grating 1 is formed by arranging steel materials having a predetermined thickness in a lattice shape, and forms various patterns such as a straight line and a wave pattern on the surface through a laser beam. The laser device (not shown) used in the present application has an oscillation wavelength of 1.064 μm, a maximum output of 50 W in the multi oscillation mode, and an oscillation mode of Q switch pulse oscillation (0.1 to 5).
0 KHz) or continuous oscillation. or,
The laser device is provided with a program control device so that a predetermined position can be irradiated with a predetermined figure.

FIG. 2 shows a view in which various patterns set in advance on the laser device are irradiated. The drawing conditions of the laser device for drawing the patterns are as follows.
0mm / sec, Q switch pulse frequency at 10KHz,
The current consumption is 20A (60Hz), 10 is a linear pattern,
11 is a wave pattern, 12 is a square pattern, and 13 is a circular pattern. An example of a cross section (linear pattern) of the pattern formed under the above conditions is shown in FIG. 3 (A to A in FIG. 2), and the portion irradiated with the laser light is melted to form a concave portion 8a, and the melted steel material is removed. The raised portions 8b are formed at both ends. The height h of the projections 8b is about 8 to 12 μ, the width w between the projections 8b is about 0.02 to 0.03 mm, and the surfaces of the projections 8b and the recesses 8a have sharp and fine irregularities. Is formed. Although not shown, cross sections of other patterns such as a wave pattern and a corner pattern are almost the same.
FIG. 4 shows the drawing conditions of the laser device, the laser beam irradiation moving speed was 10 mm / sec, and the Q switch pulse frequency was 5 mm.
KHz, current consumption 20A (60Hz), steel (s
us304) shows a cross section irradiated. Under this condition, as shown in FIG.
5a are formed deeply, and the protrusions 15b are also formed more irregularly. However, good results have been obtained by trying the slipping effect with shoes or the like. That is, the condition for irradiating the laser beam to the steel material surface may be set in consideration of the use condition or the like in which the formed convex portion is worn by shoes or the like.

By forming a pattern on the surface of the grating with a laser beam in this way, a variety of fine and sharp convexes, concaves and convexes are formed.
It has the effect of preventing slippage. That is, unlike the conventional method, the uneven portion formed on the surface of the pressed grating is uniform and has a rounded (not sharp) shape. Due to the formation of irregularities of an arbitrary shape, especially the sharp projections, the frictional resistance increases, and the effect of preventing slipping is exerted regardless of the vertical and horizontal directions of the grating.

Each of the patterns 10, 11, 12, and 13 shown in FIG.
13 is an example of various pattern forms,
A single pattern such as a straight line may be drawn on the entire surface of the grating, or various patterns may be combined in different patterns depending on the location of the grating. Also, from various test results, a wavy pattern has a larger friction resistance than a straight line pattern and shows a better result. As the pattern becomes more complicated, the friction resistance increases and the anti-slip effect can be improved.
In addition to the grating, the laser beam is used to draw various patterns on a striped steel plate used for stairs and the like, thereby preventing slipping.

[0010]

According to the present invention, non-slip prevention is exerted by a simple method of obtaining fine sharp irregularities by irradiating a laser beam to the surface of a steel material to form a pattern. Steel material can be obtained.

[Brief description of the drawings]

FIG. 1 is a diagram showing grating.

FIG. 2 is an enlarged front view of a part of grating.

FIG. 3 is a sectional view taken along the line AA of FIG. 2;

FIG. 4 is a cross-sectional view of a steel material when a laser beam is irradiated under another condition.

FIG. 5 is a plan view showing a part of the conventional grating.

FIG. 6 is a sectional view taken along line BB of FIG. 5;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Grating 10 Straight line pattern 11 Wave pattern 12 Square pattern 13 Circle pattern Concave part 8a, 15a Convex part 8b, 15b

Claims (1)

(57) [Claims] 1. The steel material is sharpened by laser light irradiation.
A non-slip steel material characterized by forming a pattern with fine irregularities .