JPH044076B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a method for manufacturing stainless steel grating used for adhering to side gutters and the like.

<Prior art> As shown in Figs. 1 and 10, stainless steel grating a is made up of side bars e connected to the edges of a lattice frame d formed by intersecting main bars b and cross bars c. They can be placed on receiving frames attached to both sides and arranged in multiple rows along the gutter, or they can be applied singly to openings in the floor, or they can be combined as appropriate. It has various uses, such as being used for landings.

By the way, the conventional method for manufacturing stainless steel grating a shown in FIG. 10 is as shown in FIG.
It consists of the following steps.

First, as shown in FIG. 11A, a plurality of connecting holes x are formed in the main bar b by press working, corresponding to the number of cross bars c. Here, the connecting hole x
shall have a horizontal width greater than or equal to the width of the crossbar c, and a vertical width less than that.

Further, as shown in FIG. 11B, a plurality of notches y are formed at predetermined intervals on the upper edge of the cross bar c by press working, corresponding to the number of main bars b.

Next, line up the required number of main bars b using an appropriate jig, and as shown in FIG. After making the edges of the holes face each other, rotate the holes so that the upper edges of the connecting holes x fit into the notches y.

Then, it is welded and fixed at the position of the connecting hole x. This operation is performed for each main bar b, and a lattice frame d is formed by orthogonally intersecting a plurality of main bars b and cross bars c.

Next, as shown in FIG. 10, side bars e, e are placed on the left and right edges of the lattice frame d, and end bars f,
f are brought into contact with each other, and each edge is welded by means such as gas welding. Thus, stainless steel grating a is manufactured.

<Problems to be Solved by the Invention> In the above-described conventional method for manufacturing stainless steel grating a, connecting holes x are formed in the main bar b,
It is necessary to make cuts y in each of the crossbars c, and moreover, there are many and troublesome assembly steps, such as inserting the crossbar c into the connecting hole x and rotating it.

An object of the present invention is to provide a method for manufacturing a stainless steel grating that allows efficient assembly of the stainless steel grating a.

<Means for Solving the Problems> The present invention is a method for manufacturing stainless steel grating characterized by comprising the following steps.

A main bar, which has a plurality of insertion grooves with welding ridges formed at appropriate intervals on the upper edge, is inserted at both ends into opposing grooves of jigs placed on both sides of the conveyor table and positioned at mutually spaced intervals. The main bars and cross bars are arranged in a lattice by inserting the cross bars across the insertion grooves of each main bar aligned in the orthogonal direction. Combine in shape.

Electrodes are arranged on the upper side facing the insertion grooves of each main bar so that the elevation can be controlled by a pressurizing cylinder, and a ground electrode is arranged on the lower side opposite the insertion grooves of each main bar. The welding section is configured such that the welding section can be controlled up and down by a lifting cylinder, and the carrier is intermittently transferred to the welding section by an intermittent feeding device, and each cylinder is driven in synchronization with the intermittent transfer, so that the tip of the electrode rod is At the same time as pressing the ground electrode onto the crossbar at the insertion groove position, the ground electrode is also pressed from below, and an excessive current is passed from the electrode rod to the ridge in the insertion groove to melt it.
A lattice frame is manufactured by resistance welding the cross bar within the insertion groove.Next, a side bar having ridges for welding formed along the longitudinal direction on its inner surface is pressure-welded to the edge of the lattice frame. Then, by applying a voltage between the edge and the side bar, the ridges are melted and the lattice frame and the side bar are joined.

<Operation> In this method, punching of the fitting groove is required only in the cross bar. Note that the ridges of the side bars are formed during extrusion molding of the bars, and no post-processing is required.

Further, the main bar and the cross bar are connected by resistance welding using the ridges of the insertion groove, and the lattice frame and the side bars are connected by using the ridges.
Therefore, connection work is performed only by voltage control, and multiple joints can be simultaneously welded.

<Example> An example of the present invention will be described with reference to FIGS. 1 to 9.

As shown in FIG. 2, a plurality of rectangular fitting grooves 1 are formed in advance at equal intervals on the upper edge of the main bar b. As shown in FIG. 2I, the fitting groove 1 is provided with a ridge 2 such as a mountain-shaped ridge 2a for welding.

In addition to this ridge 2, as shown in FIGS. 2 to V, in addition to an acute angled ridge 2b, a circular ridge 2c, and a rectangular ridge 2d, both lower bottom corner edges of the insertion groove 1 are inclined. Various shapes may be proposed, such as a corner with both corner edges serving as ridges 2e, 2e, respectively.

Figures 4 and 5 show the lattice frame c applied to the method of the present invention.
1 shows a manufacturing apparatus 10.

In the manufacturing apparatus 10, as shown in FIG.
The main bar b is provided with jigs 12, 12 arranged on both sides of the conveyor table 11 and spaced apart from each other.
Both ends are fitted into opposing grooves 13 (one side is omitted), respectively, and the arrangement is maintained by the jigs 12, 12, so that a large number of them are arranged in parallel. Then, the crossbars c are respectively placed over one row of fitting grooves that coincide in the front and back direction. The cross bar c has a rectangular shape that matches the opening shape of the fitting groove 1, and the lattice frame d is assembled by fitting the cross bar c.

Then, while being held by the jigs 12, 12,
mounted on the rollers 14 on the conveyance table 11,
By an intermittent feeder (not shown), the welded portion 15 is
It is intermittently transferred at every stroke corresponding to the interval between the crossbars c of the lattice frame d. Such a welded portion 15 is
A portal frame 16 is fixed on the base, and pressurizing cylinders 17 are held on the upper crosspiece of the portal frame 16, vertically facing the positions of the insertion grooves 1, and the same number as the insertion grooves 1. . Rod 1 of the pressurizing cylinder 17
8 supports one side of the holding stand 20 of the electrode rod 19. The other side of the holding table 20 is a chuck car 21.
is supported by The holding stands 20 are provided in four pieces in the width direction, and the pressurizing cylinders 1 are connected to each other.
The position of 7 is staggered in the front and back.

Further, a lifting platform 23 connected to an lifting cylinder 22 is provided at the lower part of the portal frame 16, and a ground electrode 2 is placed directly below the electrode rod 19 on the lifting platform 23.
4 are provided.

Then, in synchronization with the intermittent transfer, the pressurizing cylinder 17 and the lifting cylinder 22 are driven, and the electrode rod 1
The tip of the crossbar 9 is pressed against the crossbar c at the insertion groove 1 position, and the ground electrode 24 is also pressed from below. At this time, an AC voltage of about 200 V is applied from the electrode rod 19 at the insertion groove 1, and in the effective voltage range of the cycle, an excessive voltage flows to the ridge 2 and melts it, as shown in FIG. 7. , the crossbar c is resistance welded within the fitting groove 1. The cross bar c is then firmly connected to the main bar b, the assembly of the lattice frame d is completed, and the cross bar c is recovered from the take-out section 25.

When the joining of the lattice frame d is completed, the side bars e are joined to the ends of the lattice frame d.

Here, on one side of the side bar e, a plurality of ridges 3 are formed along the longitudinal direction.

3 to 3 show examples of the ridge portion 3, and FIG. 3 I shows a roof-shaped ridge portion 3a;
Fig. 3 shows a triangular ridge 3b, Fig. 3 shows a semicircular ridge 3c, and Fig. 3 shows a rectangular ridge 3d.
3 shows trapezoidal ridges 3e.

In the side bar e having such a structure, after the jigs 12, 12 are removed from the lattice frame d, the side bar e is connected as shown in FIGS. 1 and 8.

That is, side bars e, e are arranged on both sides of the lattice frame d with the ridges 3 facing, and electrode rods 26 connected to a plurality of pressurizing cylinders arranged on both sides are connected to the cylinder rods. As a result of the extension, the side bar e is brought into pressure contact with both end positions of the lattice frame d.
The electrode rods 26 are arranged on the sides of the lattice frame d for each contact end of each main bar b, and in synchronization with the contact, a voltage of about 210V is applied to the pressure contact position of the side bars e, e with the main bar b. Apply an AC voltage of approximately By applying such a voltage, a current flows from the side bar e through the ridge 3 to the edge of the main bar b. At this time, an excessive current flows through the ridges 3, causing the ridges 3 to melt, and as shown in FIG. 9, the side bars e are resistance welded to the edges of the main bars b of the lattice frame d. Ru.

This welding is performed simultaneously for the number of electrode rods 26, and is intermittently transferred for a predetermined stroke in synchronization with the contraction of the rod, and then the electrode rods 26 are brought into contact again and a voltage is applied thereby. be done. Finally, resistance welding is applied to all edges of the main bars b of the lattice frame c, and the side bars e are connected to both sides of the lattice frame c, completing the manufacture of the stainless steel grating a shown in Fig. 1. Become.

<Effects of the Invention> As described above, the present invention does not require any drilling process on each base material other than forming the insertion groove 1 in the main bar b, and there is no need for joining the main bar b and the cross bar c. Since the grating frame d and the side bars e can be joined continuously only by resistance welding, there are excellent effects such as dramatically improving the manufacturing efficiency of the stainless steel grating a.

[Brief explanation of drawings]

Figure 1 is a plan view of stainless steel grating a.
Figures 2 to 3 are side views showing examples of the fitting groove 1;
Figures ~ are end views showing an example of the ridges 3 of the side bar e, Figure 4 is a front view showing an example of the manufacturing apparatus 10 for the lattice frame c, Figure 5 is a partially cutaway side view of the same, and Figure 6 is A perspective view showing the process of connecting cross bar c, Fig. 7 is a longitudinal side view showing the welding points of cross bar c, Fig. 8 is a front view showing the connection of side bar e, and Fig. 9 is a welding of side bar e. It is a vertical side view showing a location. Also, Fig. 10 is a plan view of stainless steel grating a made by the conventional method, Fig. 11 shows the conventional method, Fig. 11 a is a side view showing the connecting hole x of main bar b, and Fig. 11 b is a side view of the cross bar c. FIG. 11C is a side view showing the cut y, and a perspective view showing the process of connecting the main bar b and the cross bar c. a; Stainless steel grating, b; Main bar, c; Cross bar, d; Lattice frame, e; Side bar, 1; Fitting groove, 2, 2a to 2e; Ridge, 3, 3
a to 3e; Ridge portion, 10; Manufacturing device, 12; Jig, 17; Pressure cylinder, 19; Electrode rod, 2
2; Lifting cylinder; 26; Electrode rod.

Claims (1)

[Scope of Claims] 1. A method for manufacturing stainless steel grating, characterized by comprising the following steps. A main bar, which has a plurality of insertion grooves with welding ridges formed at appropriate intervals on the upper edge, is inserted at both ends into opposing grooves of jigs placed on both sides of the conveyor table and positioned at mutually spaced intervals. Then, maintain the arrangement using the jig and arrange a large number of them in parallel, and fit the cross bars across the insertion grooves of each main bar aligned in the orthogonal direction, so that the main bars and cross bars are arranged in a lattice shape. Combine with. Electrodes are arranged on the upper side facing the insertion grooves of each main bar so that the elevation can be controlled by a pressurizing cylinder, and a ground electrode is arranged on the lower side opposite the insertion grooves of each main bar. The welding section is configured such that the welding section can be controlled up and down by a lifting cylinder, and the carrier is intermittently transferred to the welding section by an intermittent feeding device, and each cylinder is driven in synchronization with the intermittent transfer, so that the tip of the electrode rod is At the same time as pressing the ground electrode onto the crossbar at the insertion groove position, the ground electrode is also pressed from below, and an excessive current is passed from the electrode rod to the ridge in the insertion groove to melt it.
A lattice frame is manufactured by resistance welding the cross bar within the insertion groove.Next, a side bar having ridges for welding formed along the longitudinal direction on its inner surface is pressure-welded to the edge of the lattice frame. Then, by applying a voltage between the edge and the side bar, the ridges are melted and the lattice frame and the side bar are joined.