JPH06269890A - Production of structural material for channel cap - Google Patents

Abstract

PURPOSE:To form a projecting part for stopping a slide by clamping with pressing both side surfaces of peripheral parts of a structural material with plural clamping projections provided in pairs on circumferential surfaces of rolls and forming projecting parts protruding from side peripheral surfaces of the structural material. CONSTITUTION:Both side surfaces of peripheral parts 10 of a structural material 1 are passed through between a pair of embossing rolls 3, 3, together clamped with pressing with plural clamping projections 5, 5 provided in pairs on the circumferential surfaces of these embossing rolls 3, 3, and projecting parts 14 protruding from side peripheral surfaces of the structural material 1 are formed by a prescribed interval. In such a manner, the projecting parts 14 protruding from the side peripheral surfaces of the structural material 1 are formed in a cold rolling, and a channel cap having an effect for stopping a slide is obtained. Further, because the peripheral parts 10 are partially clamped with pressing with the clamping projections 5, 5 made in pairs, the projection 14 is formed so that a part being rolled is protruded from the side peripheral part, and can be formed with a comparatively small rolling force.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a groove lid structural material in which protrusions are formed at predetermined intervals on a side end surface of a steel structural material having a rectangular or I-shaped cross section.

[0002]

2. Description of the Related Art As shown in FIG. 11, as a groove lid A using this type of structural material, an outer frame B is formed by a strip plate, and the structural material C is arranged in parallel with the outer frame B. Structural material C
It is known that the upper part of the above is connected in the width direction with a twisted wire D, a so-called twist bar, to form a lattice. The groove cover A is used as a gutter of a road, a manhole cover or a scaffolding material for construction. To be done. A structural steel having a rectangular or I-shaped cross section is used as the structural material C. Since the lateral end surface E in the width direction of the structural material C is formed flat, this is used for the groove lid A. In this case, there is a problem that a vehicle or a pedestrian passing on the groove lid A is likely to slip. For this reason, Japanese Utility Model Publication No. 3-44841 proposes a method of manufacturing a groove lid structural material in which a longitudinal portion of the structural material C is provided with a slip-preventing protrusion by hot rolling. There is.

[0003]

In the above-mentioned manufacturing method of the prior art, by forming the protrusions on the side end faces in the longitudinal direction of the structural material, the safety of the vehicle or pedestrian passing over the groove lid can be achieved. . By the way, in manufacturing the groove lid, generally, the structural material and the wire are separately purchased and manufactured to a predetermined size at the factory. It is necessary to purchase and use the structural material with the processed parts, and structural materials of various sizes are required depending on the thickness of the groove lid, and structural materials with different widths corresponding to the thickness of these groove lids. Had to be secured as an inventory, leading to an increase in the product cost. That is, in the conventional manufacturing method, since the protrusion is formed by hot rolling, it is manufactured by, for example, a blast furnace maker equipped with hot rolling equipment. Since it is difficult to provide equipment, in order to manufacture a groove lid having a non-slip function, it was necessary to stock a large number of various types of structural materials having protrusions in stock.

Therefore, an object of the present invention is to provide a method of manufacturing a groove lid structural material capable of forming projections for slip prevention by cold rolling.

[0005]

According to the manufacturing method of the present invention, in cold rolling, both side surfaces of the edge portion of the structural material are passed between a pair of rolls, and the peripheral surfaces of these rolls are provided in pairs. A plurality of clamping projections are clamped to form a projection protruding from the side end surface of the structural member.

[0006]

When the both side surfaces of the edge portion of the structural material are clamped by the plurality of pinching projections provided in pairs on the peripheral surfaces of the pair of rolls, the edge portions pinched by the pair of pinching projections are removed. It is partially rolled, and the rolled portion projects from the side end surface of the structural material to form a protrusion.

[0007]

Embodiments of the present invention will be described below with reference to the accompanying drawings. 1 to 9 show a first embodiment of the present invention, and an apparatus used in this method will be described. As shown in FIG. 1, a structural material 1 is placed from a loading side by a pair of upper and lower pinch rolls 2 and 2. The structure is formed by a pair of left and right side rolls 4 and 3 and a pair of upper and lower pinch rolls 1 and 2 after the protrusions, which will be described later, are processed by the pair of upper and lower embossing rolls 3 and 3. The strain of the material 1 is removed and the material 1 is discharged from the discharge side. Further, as the structural material 1, an I-shaped mold steel or a mold steel having a rectangular cross section is used. As shown in FIGS. 2 to 5, the embossing rolls 3 and 3A have a radius of 12
It has a cylindrical shape of about 4 mm, and is provided with pinching projections 5 on one side of its outer peripheral surface at equal intervals around the circumference. The outer peripheral portion of the pinching projection 5 is provided with an outer peripheral surface 6 concentric with the embossing roll 3. For example, the height is 1,75 mm, the width is 6 mm, and the length is 5 mm.
The material of the embossing roller 3 is DC53 (manufactured by Daido Steel Co., Ltd.), which is subjected to vacuum quenching, high temperature tempering, and shot peening. The embossing roller 3 is attached to a pair of upper and lower drive shafts 8 and 8 which are provided with adjustable spacings via bearings 7 and is fed along guide members 9 and 9 provided along side surfaces. The structural material 1 is rolled by cold rolling, and the structural material 1 is fed by the guide member 9 so that the edge portion 10 of the structural material 1 is clamped by the clamping projections 5 and 5, and 5
As shown in FIG. 5, the side end surface 11 of the structural material 1 is set so as to pass within the width of the pinching projection 5. Further, a drive device 12 for rotationally driving the drive shafts 8 and 8 in synchronization in opposite directions is connected to the upper and lower drive shafts 8 and 8 as shown in FIG.

The edge portion 10 of the structural material 1 fed between the upper and lower embossing rolls 3, 3 by cold rolling has a pair of clamping projections provided on the peripheral surface of the embossing rolls 3, 3. 5,5
The thin-walled portion 13 that has been partially rolled by the above-mentioned rolling and has a reduced thickness protrudes from the side end surface 11 of the structural material 1 to form a protrusion 13.

As described above, in the present embodiment, in cold rolling, both side surfaces of the edge portion 10 of the structural material 1 are passed between the pair of embossing rolls 3 and 3, and the peripheral surfaces of the embossing rolls 3 and 3 are opposed to each other. This is a method of forming protrusions 14 projecting from the side end face 11 of the structural material 1 at a predetermined interval by pinching with a plurality of clamping projections 5 and 5 that are provided as described above. The protrusion 14 can be formed on the end surface 11, and by using a versatile I-shaped mold steel or a mold steel having a rectangular cross-section, the groove lid having the protrusion 14 for slip prevention is formed. It is not necessary to stock a large amount of structural materials having projections according to the type, and it is possible to provide a groove lid having an anti-slip effect at low cost. Further, since the edge portion 10 is partially pinched by the pair of pinching protrusions 5 and 5, the portion rolled by the pair of pinching protrusions 5 and 5 protrudes from the side end surface 11. The portion 14 is formed, and the protrusion 14 can be formed with a relatively small rolling force.

The present invention is not limited to the above embodiment, but various modifications can be made within the scope of the present invention. For example, FIG. 10 shows a second embodiment of a die steel having a rectangular cross section. It is used as the structural material 1A, and the protrusions 14 can be formed also on the structural materials 1 and 1A having such a rectangular cross section.

[0011]

According to the method of the present invention, in cold rolling, both side surfaces of the edge of the structural material are passed between a pair of rolls, and a plurality of pinching projections provided in pairs on the peripheral surfaces of these rolls. The method of manufacturing the groove lid structural material is capable of forming the projections for slip prevention by cold rolling because the projections protruding from the side end surfaces of the structural material are formed by pinching by the pressing. be able to.

[Brief description of drawings]

FIG. 1 is a schematic plan view showing a first embodiment of the present invention.

FIG. 2 is a side view of the embossing roll according to the first embodiment of the present invention.

FIG. 3 is a front view of the embossing roll according to the first embodiment of the present invention.

FIG. 4 is an enlarged cross-sectional view of a main part of a side surface of the embossing roll according to the first embodiment of the present invention.

FIG. 5 is an enlarged view of a front main part of the embossing roll according to the first embodiment of the present invention.

FIG. 6 is an enlarged view of a front main part of the embossing roll showing the first embodiment of the present invention.

FIG. 7 is a plan view of the structural material showing the first embodiment of the present invention.

FIG. 8 is a sectional view taken along line XX of FIG. 7 showing the first embodiment of the present invention.

FIG. 9 is a sectional view taken along line YY of FIG. 7 showing the first embodiment of the present invention.

FIG. 10 is a sectional view of a structural material showing a second embodiment of the present invention.

FIG. 11 is a partially cutaway perspective view of a groove cover showing a conventional example.

[Explanation of symbols]

 1,1A Groove cover 3 Embossing roll 5 Clamping protrusion 10 Edge 11 side end face 14 Projection

Claims (1)

[Claims] 1. In cold rolling, both side surfaces of an edge portion of a structural material are passed between a pair of rolls, and the peripheral surface of these rolls is clamped by a plurality of clamping projections provided in pairs to form the structure. A method of manufacturing a structural material for a groove lid, which comprises forming a protrusion protruding from a side end surface of the material.