JPH0340468Y2 - - Google Patents

Description

[Detailed explanation of the idea] <Industrial application field> This invention relates to a welding jig for a wire mesh welding machine.

<Conventional technology> A wire mesh welding machine advances a plurality of parallel vertical wires between upper and lower opposing electrodes, welds horizontal wires one after another, and pulls them out.In order to handle long vertical wires, There was a strong technical interest in efficiently and accurately feeding the welding machine, positioning it, and pulling it out, and because welding itself was easy, there was relatively little interest.

<Problems to be solved by the invention> Wire mesh welding is multi-point lap resistance welding at the intersection of vertical and horizontal lines, and if the three welding conditions of pressure, current, and time are appropriately set, welding can continue without problems.

However, recently, since the horizontal lines are welded on top of the vertical lines, there is a dislike for creating a step between the two lines, and there has been a demand for wire mesh welded with as few steps as possible.

Currently, the minimum step that can be made with a wire mesh welding machine is 5 mm.
The vertical and horizontal wires have been reduced to 0.2mm.

However, when welding with a small step like this,
There was a problem in that the excess thickness of the welded parts that were pressed together swelled, and the resulting wire mesh was longer than the required dimensions both vertically and horizontally.

This idea was born from the idea that this difficulty could be solved by using a welding jig.

<Means for solving the problem> The welding jig of the wire mesh welding machine of this invention advances a plurality of parallel vertical wires between upper and lower opposing electrodes,
This is a welding jig for a wire mesh welding machine that welds horizontal wires one after another and pulls them out.It is a vertical wire restraint device that passes each vertical wire just before entering between the upper and lower electrodes, making it possible to move straight but not move laterally. When the horizontal wire that has been welded between the upper and lower electrodes comes out forward by one pitch, it advances from the waiting position and touches the front surface of the horizontal wire between each vertical wire, and the horizontal wire continues until the next welding is completed. It is characterized by comprising a horizontal wire restraint device that suppresses forward movement of the entire length.

<Function> The welding jig positions the two parts to be welded and prevents them from moving freely, but in the case of this invention, it exclusively restricts movement due to minute welding distortions.

That is, this invention provides a restraining device for each of the vertical wire and horizontal wire separately from the conventional positioning device for the vertical wire and horizontal wire in wire mesh welding. The former prevents the lateral bulge of each weld by disabling the lateral movement of each vertical wire, and the latter prevents the forward movement of each weld by suppressing the forward movement of the entire length of the horizontal wire. Stop the bulge.

Therefore, since each welded portion cannot bulge out laterally or forwardly, the pitch intervals between the vertical and horizontal lines can be maintained correctly. Each welded part can freely bulge out to the rear, but since there is no horizontal wire attached to the back, it has nothing to do with the pitch size.

Since the horizontal wire restraint device retreats to the standby position every time one horizontal wire is welded, it does not hinder the forward movement of the horizontal wire.

<Example> Figures 1 and 2 are explanatory diagrams of the main parts of an embodiment of this invention, in which 1 is a vertical wire rod, 2 is a horizontal wire rod, 2' is a welded horizontal wire rod, 3 is a vertical wire restrainer, and 4 is a vertical wire rod. Horizontal wire restraint,
Reference numeral 5 indicates the lifting mechanism, 6 indicates a wire mesh guide table, and 7 and 8 indicate upper and lower electrodes.

As is well known, the wire mesh welding machine advances a plurality of parallel vertical wire rods 1 between the upper and lower electrodes 7 and 8, welds horizontal wire rods 2 one after another, and then pulls them out.

That is, when each upper electrode 7 rises, the vertical wire 1
are advanced one pitch at a time, one horizontal wire 2 is inserted directly below the electrode 7, and by lowering the electrode 7, applying pressure, and applying electricity, a series of intersections of the vertical and horizontal wires are resistance welded all at once.

Maintaining the mutual spacing (vertical line pitch) of the vertical wire rods 1,
The guide positioning mechanism that advances the electrodes 7 and 8 to the correct position and stops at a fixed distance (horizontal line pitch) is the same as the conventional one and is not shown in the figure. May be used for both.

In the vertical wire restraining device 3, the vertical wire 1 is the upper and lower electrodes 7 and 8.
Each vertical line 1 is passed through a through hole (or groove) 3a with no play in the horizontal direction.
Allows straight-line movement, but prevents sideways movement.

Since the vicinity of the welding position of a large number of vertical wire rods 1 is all impossible to move laterally, each welded portion cannot bulge in the horizontal direction. Therefore, irregularities in the mutual spacing of the vertical wires 1, that is, in the pitch of the vertical wires, which have conventionally been caused by relatively easy expansion in the horizontal direction, can be prevented.

On the other hand, the horizontal wire restraint device 4 advances from the standby position (the chain line position in FIG. 1) only during welding, contacts the horizontal wire 2' between each vertical wire 1, 1 on the front side (on the advancing direction side), The forward movement of the entire length of the horizontal wire rod 2 is suppressed until welding is completed. In this embodiment, the restraint 4 is lowered from an upper standby position to a position on a wire mesh guide 6 by a lifting mechanism 5 such as a fluid pressure cylinder attached to both ends thereof, and is fixed so as not to move by fluid pressure etc. .

The restraint tool 4 in this state is shown in cross section in FIG. A large number of rectangular restraint blocks 4a and 4b protrude from the lower surface of this restraint device 4, and each of them abuts the front surface of the horizontal wire 2' between the vertical wires 1 and 1, and restricts its forward movement. The block 4a is in contact with the horizontal wire 2' which has just been welded, and the block 4a
b is in contact with the horizontal wire 2' that was previously welded.

In order to suppress the forward bulge of the welded part, it is sufficient to prevent the movement of the vertical wire 1 facing forward.
It is only necessary to securely hold down only one horizontal wire 2' that is fixed to the horizontal wire 2'. However, it is more reliable to hold down two horizontal wire rods 2' as in this embodiment than to hold down one horizontal wire 2' which is still hot immediately after welding.

Since the entire length of the welded horizontal wire 2' is prevented from moving forward, the pitch between the welded horizontal wire 2' and the horizontal wire 2 is maintained at a regular size, and there is no elongation as in the conventional case.

Although this invention has been described above with reference to one embodiment, the restraining devices 3 and 4 for the vertical wire rod and the horizontal wire rod can be varied and applied in various shapes and dimensions according to the implementation conditions within the scope of the gist of this invention. Needless to say.

<Effects of the invention> This invention adds a new function to the welding jig, which was previously used to position the two parts to be welded and to suppress welding distortion in the vicinity, to suppress the bulge caused by pressure immersion of the welded part itself. gave.

The wire crossing part is pressurized and compressed from above and below, and the wire mesh welded part, which tends to bulge in all directions other than up and down, is prevented from bulging at least to the left and right and forward. The means to do this is not to fix the area near the weld with a clamp, which is common sense, but to use a restraint that prevents the vertical wire near the weld from moving horizontally, and to simply move the horizontal wire that comes out after welding forward. It is a restraint that prevents you from doing so. This idea is an extremely simple jig compared to a clamp mechanism, leaves no clamp marks on the product, and prevents dimensional irregularities in wire mesh products caused by multi-point welding.

[Brief explanation of the drawing]

FIG. 1 is an explanatory elevation view of one embodiment of this invention, and FIG. 2 is an explanatory plan view thereof. In the figure, 3 is a vertical wire restraint, and 4 is a horizontal wire restraint.

Claims (1)

[Scope of Claim for Utility Model Registration] A welding jig for a wire mesh welding machine that advances a plurality of parallel vertical wires between upper and lower opposing electrodes, overlaps and welds horizontal wires one after another, and then pulls them out, between the upper and lower electrodes. Pass each vertical wire just before entering the
When the vertical wire restraint device that can move straight but cannot move laterally and the horizontal wire that has been welded between the upper and lower electrodes come forward by one pitch, it advances from the standby position and separates the horizontal wire between each vertical wire. A welding jig for a wire mesh welding machine, comprising: a horizontal wire restraint that is in contact with the front surface and suppresses forward movement of the entire length of the horizontal wire until the next welding is completed.