JP3345841B2 - Manufacturing method of grating substrate - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a grating substrate having a non-slip projection at the upper edge of a strip-shaped metal material having a rectangular or I-shaped cross section.

[0002]

2. Description of the Related Art As shown in FIG. 11, generally, a grating a used for a groove cover or the like is composed of a pair of side bars b, b provided at side edges and end portions of the side bars b, b. Frame d formed in a rectangular shape by end bars c, c connecting
, And a plurality of main bars e... Arranged in parallel at regular intervals along the longitudinal direction and a cross bar f orthogonal to each main bar e.

For the plurality of main bars e arranged in the width direction of the grating a, a long base material made of a strip-shaped metal material having a rectangular or I-shaped cross section is generally used. The base material has a drawback that it is slippery and dangerous because its upper surface is flat.

In order to cope with such a problem, Japanese Patent Publication No. 3-44841 proposes a method in which anti-slip projections are formed at regular intervals along the longitudinal direction of the upper surface of the base material. .

In the method of forming the projections, in hot rolling, a mold steel having a rectangular or I-shaped cross section is pressed in a width direction of the mold between a pair of rolls, and a printing pressure is formed by a circumferential groove provided in one of the rolls. By forming a ridge along the longitudinal direction of the mold steel on the side end face on one side in the width direction of the mold steel, and then pressing the top surface of the ridge with a roll of uneven surface at a predetermined interval on the top of the ridge. The projection is formed.

[0006]

However, according to the conventional forming method, as described above, a step of forming a ridge along the longitudinal direction on one end face of the section steel, and further forming an upper portion on the ridge. Since stepwise processing is performed in two steps, that is, a step of forming projections at predetermined intervals, the production efficiency is low, and large-scale hot rolling equipment is required. SUMMARY OF THE INVENTION An object of the present invention is to provide a method for manufacturing a grating base material that can easily and efficiently form anti-slip projections.

[0007]

According to the present invention, there is provided a fixed clamping device.
And a movable clamp that is arranged to face the fixed clamp.
Are arranged in a line at predetermined intervals.
The upper edge of the strip-shaped metal material is
By pressing in the thickness direction at predetermined intervals along the longitudinal direction,
Swelling the side edge of the pinching portion in the width direction of the metal strip
Thereby, on the upper edge of the strip-shaped metal material, in the longitudinal direction thereof
It is characterized in that a plurality of projections are formed along the same .

[0008]

When the upper edge of the strip-shaped metal material is squeezed at predetermined intervals, each of the squeezed portions becomes thinner, and the side edge of the squeezed portion is pushed out by that much, and the strip-shaped metal material is pressed. A plurality of protrusions bulging in an arc shape are formed on the upper edge. Here, since the height of the protrusion is proportional to the strength of the clamping force, the higher the clamping pressure, the higher the protrusion can be formed in one processing operation. In addition, since the pressing force is partial, the pressing force concentrates on the pressing portion, and the protrusion having a desired height can be easily formed with the large pressing force.

[0009]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. FIGS. 1 to 3 show a die 1 of a press apparatus applicable to the method of the present invention. The die 1 is composed of an upper die 1a and a lower die 1b which are vertically stacked. A charging port 2 is formed along the longitudinal direction of the mold 1 by cutting a front portion of a stacked portion of the mold 1a and the lower mold 1b so as to face each other. A fixed clamp 3 having a circular cross section is disposed upward in the loading mold 2 on the lower mold 1b side, while a movable clamp 4 having a circular cross section is also provided on the fixed mold 3 on the upper mold 1a side. They are arranged facing each other.
The movable clamp 4 is vertically movably inserted into a through hole 5 formed in the upper mold 1a.
a and is held at the retracted position by being urged upward by a spring 6 interposed between the retracted position. The fixed nipping element 3 and the movable nipping element 4 constitute a pair of upper and lower nipping elements 7.
Are arranged in a line in the charging port 2 at predetermined intervals.

As shown in FIG. 2, in the mold 1, a strip-shaped metal material 8 having an I-shaped cross section is loaded into the loading port 2 with its upper edge 9 being oriented sideways. Positioning is performed so that substantially half of the circular tip surface of the fixed pressing element 3 contacts the lower surface of the edge 9. Then, in this state, the mold 1 is
Is pressed down from above and below, as shown in FIG. 3, the movable presser 4 is pushed down, and the upper edge portion of the strip-shaped metal material 8 is formed by the both circular tip surfaces of the movable presser 4 and the fixed presser 3. 9
Is pressed in its thickness direction. As a result, the pinching portion 1
At the same time, the side edge 11 of the pinching portion 10 is extruded in the width direction of the strip-shaped metal material 8 and plastically deformed, and as shown in FIGS. A plurality of protrusions 12 bulging in an arc shape along the longitudinal direction on the upper edge 9 of the metal material 8 become the grating base 13 formed by the number of the indenter pairs 7.

[0011] Here, the height of the protrusion 12 can be set arbitrarily by the pressure of the press, in the prototype, as shown in FIGS. 4 and 6, the thickness w ₁ of the side edges 9 5 mm, JI
The strip-shaped metal member 8 made of steel material S standard SS400, and nipped by pressing element pair 7 formed in a circular tip surface with a diameter of 8 mm, was thinned wall thickness w ₂ of the holding part 10 to 3mm As a result, a projection 12 having a height h of 2 mm could be formed.

FIG. 8 shows an example of the grating formed by using the grating substrate 13 obtained by the method of the present invention. As shown, this grating 14
Is an ordinary strip-shaped metal material placed upright and arranged in parallel.
A plurality of main bars 16 consisting of a short grating base material 13 standing upright with the side edges on which the projections 12 are formed facing up between two long side bars 15; 17 and 17 are arranged at predetermined intervals, and both ends of the main bars 16 and the end bars 17 and 17 are fixed to the side bars 15 and 15 by welding, and a plurality of crosses orthogonal to the main bars 16 and the like. The bars 18 are fixed to the main bars 16 and the end bars 17, 17 by welding.

In the embodiment, the strip-shaped metal material 8 having an I-shaped cross section is exemplified. However, the method of the present invention uses a strip-shaped metal material having a rectangular or L-shaped cross section as a processing material. The protrusion 12 may be formed on an edge.

In the embodiment, the upper mold 1a of the mold 1 is used.
9 is inserted through the through hole 5 so as to be vertically movable and is normally urged upward by the spring 6, but is not limited to this. As shown in the figure, the movable clamp 4 'facing the fixed clamp 3 of the lower mold 1b projects downward from the upper mold 1a, and the upper mold 1a is attached to the head of the press device and moved up and down. Is also good.

Here, the movable clamp 4 'disposed on the upper mold 1a.
Is set to the same dimension as the amount of depression on one side of the pressing portion 10 formed in the strip-shaped metal material 8, while the lower mold 1 b
Is slightly longer than the fixed pressurizer 3, and the metal plate 1 ′ provided with the movable pressurizers 4 ′, 3 makes the strip-shaped metal material 8.
As shown in (a) of FIG. 10, first, the movable clamp 4 'of the upper die 1a, which is rapidly pushed down by the pressing device, strikes the strip-shaped metal member 8, and the impact causes the clamp portion to be pressed. 10, the upper surface portion 10a is more depressed, and the lower surface portion 10b
Is slightly depressed. When the upper mold 1a further descends, as shown in FIG. 10B, the upper surface 10a of the clamping unit 10 is completely recessed corresponding to the length of the movable clamp 4 ', and the lower surface of the upper mold 1a is lowered. It comes into contact with the upper side surface of the strip-shaped metal material 8. When the upper mold 1a further descends in this state, the lower surface 10b of the clamping unit 10 is depressed this time, and the amount of depression of the lower surface 10b at the preset bottom dead center of the upper mold 1a is reduced by the upper surface. This is the same as the depression amount of 10a. As a result, as shown in FIG. 10C, it is possible to form the protrusion 12 that swells accurately along the center line x of the thickness of the strip-shaped metal material 8.

[0016]

As described above, according to the present invention, the upper edge portion of the strip-shaped metal material is pressed in the thickness direction at predetermined intervals along the longitudinal direction, and the side edge of the pressed portion is fixed to the strip-shaped metal material. By bulging in the width direction of the material, a plurality of protrusions are formed at a desired height on the upper edge portion of the strip-shaped metal material along the longitudinal direction, so that the anti-slip effect is excellent. It is possible to easily manufacture a grating substrate having a raised projection.

In particular, in the present invention, the fixed pincer and the
Consists of a movable clamp that is placed opposite to the fixed clamp
A press formed by arranging a plurality of pinch pairs in a row at predetermined intervals.
Since the metal mold of the tooling device is used, a projection having a desired height can be formed in a single processing operation without performing stepwise processing including a plurality of steps as in the related art. Can be remarkably improved, and
Therefore, there is an excellent effect that large-scale hot rolling equipment is not required.

[Brief description of the drawings]

FIG. 1 is a perspective view of a press die applicable to the present invention.

FIG. 2 is a side cross-sectional view of the same press die.

FIG. 3 is a side sectional view showing an operation state of the press die according to the first embodiment.

FIG. 4 is a front view of a grating substrate obtained by the present invention.

FIG. 5 is a plan view of the same grating substrate.

FIG. 6 is a cross-sectional view of A- in FIG.
It is A sectional drawing.

FIG. 7 is a perspective view of a main part of the grating substrate according to the first embodiment;

FIG. 8 is a plan view of grating formed by using the grating base material.

FIG. 9 is a front view showing another embodiment of the press die.

FIG. 10 is a side sectional view showing an operation state of another embodiment of the above.

FIG. 11 is a plan view of a conventional grating.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 mold 3 fixed clamp 4 movable clamp 7 clamp pair 8 metal plate 9 upper edge 10 clamping portion 11 side edge 12 protrusion 13 grating base material

Claims (1)

(57) [Claims] 1. A fixed pressurizer and a fixed presser facing the fixed presser.
Multiple pairs of clamps consisting of movable clamps
By the die of the press device arranged in a line at intervals,
The upper edge of the strip-shaped metal material is placed at predetermined intervals along the longitudinal direction.
To the thickness direction, the side edge of the pressure portion is a band-shaped metal material
By swelling in the width direction of the band-shaped metal material
A plurality of protrusions are formed on the upper edge along the longitudinal direction.
Method for producing a grating base material, characterized in that that.