JP4129410B2 - Manufacturing method of grating - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a manufacturing method of a grating used as a grid-like component material such as a water channel cover, a doormat, and a strainer.
[0002]
[Prior art]
2. Description of the Related Art A manufacturing method for a grating is known that includes a plurality of main bars arranged in parallel at predetermined intervals and a cross bar that is orthogonally crossed and joined to the upper surface of each main bar (see, for example, Patent Document 1).
[0003]
In such a conventional manufacturing method, first, a plurality of main bar materials having a long standard dimension of about 6 meters are aligned at predetermined intervals on a conveyor using a jig, and the upper surface thereof is orthogonal to each main bar material. A plurality of crossbars are placed at predetermined intervals, and the conveyor is intermittently moved in this state, and the electrode plate of the resistance welding machine is welded to the main bar material by applying pressure from above to each crossbar. To produce a primary intermediate product called a panel, and then cut the long main bar material constituting this panel into a predetermined length and divide it into a plurality of secondary intermediate products, and finally End bars were joined along both end portions of each main bar constituting the secondary intermediate product to obtain a finished product.
[0004]
[Patent Document 1]
Japanese Patent Laid-Open No. 6-7932 (Prior Art, FIGS. 4 to 8)
[0005]
[Problems to be solved by the invention]
In the conventional manufacturing method as described above, a large resistance welding machine equipped with an electrode plate corresponding to the length of the cross bar is necessary for manufacturing a panel which is a primary intermediate product. Since the number of main bar materials welded to the bar at a time is usually as large as about 30 to 35 and there are many welded portions, a large-capacity applied current is required. In addition, because resistance welding with all main bar materials is performed at once for each crossbar, the pitch between the main bar materials is likely to be distorted due to distortion caused by high heat generation, and the irregular pitch is obvious at a glance. In order to avoid this, the interval between the main bar members could not be made too narrow. For this reason, at the time of use, there was a problem that a pedestrian's high-heeled heel or cane fits into the gap between the main bars. In addition, end bars had to be joined along both ends of each main bar to improve strength.
[0006]
An object of the present invention is to provide a manufacturing method of a grating capable of solving such a conventional problem.
[0007]
[Means for Solving the Problems]
The present invention relates to a manufacturing method of a grating comprising a plurality of crossbars arranged in parallel at a predetermined interval, and a plurality of main bars disposed substantially orthogonally on the top surface of the crossbar and joined to each crossbar. The plurality of circumferentially arranged cross bars are moved in the longitudinal direction while rotating in the circumferential direction, and a single main bar is continuously supplied to each cross bar from the tangential direction. The cylindrical lattice body is formed by sequentially resistance-welding the intersecting portions while winding with a circumferentially arranged cross bar, and then the cylindrical lattice body is cut along the longitudinal direction and shaped into a flat plate shape. The manufacturing method of the grating characterized by these.
[0008]
In such a configuration, the resistance welding machine used for welding may be a small resistance welding machine capable of welding the crossing portion of the crossbar and the main bar at each location, and the applied current may be a small capacity. Can be reduced. In addition, since the cross bar and main bar intersections are welded one by one in order, distortion due to high heat hardly occurs, and there is almost no deviation in pitch between the main bars due to the distortion, improving dimensional accuracy. . As a result, the pitch between the main bars can be set to be extremely small, and the distance between the main bars can be made small, so that the heel and heel of the pedestrian fit into the gap between the main bars. It becomes possible to eliminate such problems. In addition, by setting the pitch between the main bars to be extremely small, the number of joints by welding with the cross bar increases, so the strength of the entire grating is improved and the conventional joint that has been joined along both ends of each main bar. An end bar is not required.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of a manufacturing method for a grating according to the present invention will be described with reference to the accompanying drawings.
1 and 2 show a grating 1 manufactured by the manufacturing method of a grating according to the present invention, and the grating 1 is substantially orthogonal to a plurality of crossbars 2 arranged in parallel at a predetermined interval and the upper surface of the crossbar 2. A plurality of main bars 3 arranged in a shape and joined to the respective cross bars 2 are provided. Here, as shown in FIG. 3, the main bar 3 has a width W ₁ of about 5 mm, a height H ₁ of about 5.7 mm, an inverted triangular section (see FIG. 3 (A)), and an inverted pentagonal section ( A wire such as that shown in FIG. 3 (b) is preferably used, and the sharp end at the lower end thereof facilitates joining with the cross bar 2 by resistance welding. On the other hand, a flat bar (see FIG. 3C) having a rectangular cross section having a width W ₂ of about ₂ mm and a height H ₂ of about 15 mm can be suitably used for the cross bar 2. Further, the material of the main bar 3 and the cross bar 2 is preferably stainless steel having excellent corrosion resistance, rigidity and aesthetics, but steel and aluminum alloy can also be used as other materials.
[0010]
In order to manufacture the grating 1, as shown in FIG. 4, first, a plurality of crossbars 2 cut in advance to a predetermined dimension of about 2 to 4 m are circumferentially formed by a jig 4 that can be rotationally driven at a fixed position. To place. Here, the jig 4 has a disk shape, and as shown in FIG. 5, rectangular insertion holes 5 into which the crossbar 2 can be inserted are formed at regular intervals in the circumferential direction in a direction along the radial direction. The plurality of crossbars 2 can be arranged circumferentially in the direction along the radial direction by inserting the crossbars 2 through the respective insertion holes 5. Then, by rotating the jig 4, the plurality of circumferentially arranged cross bars 2 are rotated in the circumferential direction, and the entire plurality of cross bars 2 are pulled from the front and simultaneously moved in the longitudinal direction. As shown in FIG. 6, a single main bar 3 is continuously supplied from the tangential direction, and the intersection between the main bar 3 and each cross bar 2 is formed into a disk-like upper electrode 6a and lower electrode 6b. Clamping with resistance welding sequentially The disk-shaped upper electrode 6a and lower electrode 6b are a pair of electrodes that constitute a resistance welder, and are driven to rotate as the plurality of crossbars 2 rotate. Here, since the plurality of crossbars 2 as a whole move forward while rotating, a single main bar 3 is sequentially welded to each crossbar 2 at the intersection, and a plurality of crosses arranged circumferentially. The bar 2 is wound up spirally. Therefore, if the feed speed of the entire cross bar 2 is increased, the mutual interval W ₃ (see FIG. 2) between the adjacent main bars 3 is increased, and conversely, if the feed speed is decreased, the mutual interval W ₃ is reduced. The mutual interval W ₃ between the main bars 3 can be adjusted within a range of 0.025 to 10 mm by changing the feed speed of the entire cross bar 2 and appropriately setting the pitch between the main bars 3.
[0011]
As shown in FIG. 7, a cylindrical lattice body 7 is formed by sequentially resistance-welding the intersecting portions while winding the single main bar 3 with the cross bars 2 arranged circumferentially as described above. Then, by cutting each main bar 3 constituting the outer periphery of the cylindrical grid 7 in a straight line, as shown in FIG. 8 (a), the cylindrical grid 7 is opened along the longitudinal direction, Further, the opening is expanded and flattened to such an extent that it can be rolled. Next, as shown in FIG. 8 (b), the cylindrical lattice body 7 is further flattened by a roll process using a roll machine 8, and finally made into a complete flat plate shape by a press process using a press machine 9. Shape it. The length of the flat shaped body is substantially the same as the length of the used crossbar 2, and the width is substantially the same as the circumferential length of the cylindrical lattice body 7. And the grating 1 as shown in FIG. 1, FIG. 2 is manufactured by cut | disconnecting this flat shaped shaped body to predetermined length along a width direction, and dividing | segmenting into several.
[0012]
In such a configuration, the resistance welding machine used for welding may be a small resistance welding machine capable of welding the intersections of the crossbar 2 and the main bar 3 at each location, and the applied current may be a small capacity, Cost is reduced. Further, since the crossing portions of the cross bar 2 and the main bar 3 are sequentially welded one by one, distortion due to high heat hardly occurs, and there is almost no deviation in pitch between the main bars 3 due to the distortion, thereby improving the dimensional accuracy. . As a result, the pitch between the main bars 3 can be set very small, and the mutual interval W ₃ between the main bars 3 can be made small. Furthermore, by setting the pitch between the main bars 3 to be extremely small, the number of joints by welding with the cross bar 2 increases, so that the strength of the entire grating 1 is improved.
[0013]
In addition, the grating 1 manufactured according to the present invention is used as a grid-like constituent material in a water drain cover, a doormat, a strainer attached to various devices, a basket of grease interceptor, a tree root cover, an underfloor vent, and the like. It can be used and other various uses are expected.
[0014]
【The invention's effect】
As described above, the present invention moves a plurality of circumferentially arranged crossbars 2 in the longitudinal direction while rotating in the circumferential direction, and continuously supplies each crossbar 2 from the tangential direction. The cylindrical main body 3 is wound around the circumferentially arranged cross bar 2 and its intersection is sequentially resistance welded to form a cylindrical lattice body 7. Therefore, the resistance welding machine used for welding is a small size capable of welding the intersections of the cross bar 2 and the main bar 3 at each location. The resistance welding machine may be used, and the applied current may be a small capacity. Further, since the crossing portions of the crossbar 2 and the main bar 3 are welded one by one in order, distortion due to high heat hardly occurs, and there is almost no deviation in pitch between the main bars 3 due to the distortion. Will improve. As a result, the pitch between the main bars 3 can be set extremely small, and the mutual interval W ₃ between the main bars 3 can be made small. It is possible to eliminate the problem of fitting into the gap. Furthermore, by setting the pitch between the main bars 3 to be extremely small, the number of joints by welding with the cross bar 2 increases, so that the strength of the entire grating 1 is improved and the joints are joined along both ends of each main bar 3. There are excellent effects such as eliminating the need for the conventional end bar.
[Brief description of the drawings]
FIG. 1 is a plan view of a grating 1 manufactured by a manufacturing method of a grating according to the present invention.
FIG. 2 is a partially enlarged side sectional view of the grating 1 of the same.
FIG. 3 is a side sectional view showing the shapes of a cross bar 2 and a main bar 3 used for manufacturing.
4 is a perspective view showing a state in which a plurality of crossbars 2 are arranged circumferentially by a jig 4. FIG.
FIG. 5 is an enlarged front view of the jig 4;
FIG. 6 is an explanatory view showing a state in which a single main bar 3 is continuously supplied from the tangential direction of a plurality of cross bars 2 arranged circumferentially and resistance welding is performed.
FIG. 7 is a schematic perspective view of a cylindrical lattice body 7 formed by a resistance welding process.
FIGS. 8A and 8B are explanatory views of a process of flattening the cylindrical grid 7 along the longitudinal direction and then flattening to such an extent that it can be rolled, and FIG. 8B is a process of further flattening by roll machining. It is explanatory drawing.
[Explanation of symbols]
1 Grating 2 Cross bar 3 Main bar 7 Cylindrical lattice

Claims (1)

A grating manufacturing method comprising: a plurality of cross bars arranged in parallel at a predetermined interval; and a plurality of main bars disposed substantially orthogonally on the upper surface of the cross bar and joined to the respective cross bars,
A plurality of circumferentially arranged cross bars are moved in the longitudinal direction while rotating in the circumferential direction, and a single main bar that is continuously supplied to each cross bar from the tangential direction is A cylindrical grid body is formed by sequentially resistance-welding the intersecting portions while winding with a cross bar arranged on the cylindrical bar, and then the cylindrical grid body is cut along the longitudinal direction and shaped into a flat plate shape. Manufacturing method of grating.

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