JPH0584581A - Round bar welding machine - Google Patents

Abstract

PURPOSE:To attain the stabilization and safety of work of a lap resistance welding machine by providing rods for positioning a round bar and preventing it from falling and a slant for supplying the round bar. CONSTITUTION:In a state with upper and lower electrodes opened, when the round bar is placed on the slant 10 for supplying the round bar, the bar falls down, guided and held in an almost V-shaped groove 4 on the upper surface of the lower electrode with the plural rods or bars 7 projecting on the upper surface of the lower electrode as stoppers. When a member to be welded is mounted so as to cross the round bar and the upper and lower electrodes are pressed against these and energized to perform welding, the bars 7 fixed on a welding machine frame 9 are left in accordance with a rise of the lower electrode and are not projected on the upper surface of the lower electrode.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a welding machine for round bars using a lap resistance welding method.

[0002]

2. Description of the Related Art Conventionally, spot welding or lap resistance welding such as projection welding has been used as a welding method for joining round bars to each other or as a welding method for joining round bars having different shapes. It has been widely used. This is characterized by the fact that the lap resistance welding machine places the members to be welded between the upper and lower electrodes and energizes and pressurizes the electrodes in an extremely short time, and at the same time, can firmly join many points. This is because.

However, in order to obtain a strong joint between the members, the member to be welded must be placed at the correct position on the electrode of the lap resistance welding machine, but the member to be welded is a round bar. In some cases, such as when it has a shape that is easy to roll, or when it has a shape that easily rolls, the member may come off the correct position on the welding machine
Therefore, there is an inconvenience that an accurate and strong joint cannot be obtained. Also, when the member to be welded is placed between the upper and lower electrodes of the lap resistance welding machine and the electrode is energized and pressurized, the upper electrode or the lower electrode is moved up and down,
There is also the inconvenience that the member placed on the electrode may be displaced from the proper position due to the vibration generated by the vertical movement of the electrode, which may make it impossible to obtain an accurate and strong joint. ．

As a countermeasure for this problem, a round bar welding machine has been used in which a groove is provided in the longitudinal direction of the lower electrode of the lap resistance welding machine to form a welding positioning groove for the round bar to be welded. Since the welding positioning groove of the round bar on the upper surface of the lower electrode of the round bar welding machine is gradually deformed due to high temperature, high pressure due to energization and pressurization during welding, and wear due to contact of the members, the member placed on the electrode becomes normal. It was not possible to obtain the full effect of preventing it from coming off the position of. Furthermore, in welding work, in order to place the member to be welded on the electrode of the lap resistance welding machine, the worker must work close to the electrode of the lap resistance welding machine. There was a risk of getting your hands caught between the electrodes and getting burned by the scattered fireballs.

[0005]

The problem to be solved is that, in a round bar welding machine using the lap resistance welding method, the member placed on the electrode is apt to be displaced from the regular position, and therefore, it is not accurate. In some cases, a strong joint may not be obtained, and in order for the worker to place the member to be welded on the electrode of the round bar welder using the lap resistance welding method, the worker should work close to the electrode. The point is that it must be done.

[0006]

SUMMARY OF THE INVENTION The present invention is a round bar welding machine which uses a lap resistance welding method and uses a lower electrode as a movable electrode for pressurization, and a groove is formed on the upper surface of the lower electrode in the longitudinal direction of the electrode. To form a welding positioning groove for a round bar to be welded, and to form a plurality of holes or grooves vertically passing through the electrode on one side of the groove, the electrode through hole or the electrode In each of the through-grooves, slidably mount a rod or bar of a length that protrudes on the upper surface of the lower electrode when the lower electrode is lowered, and does not protrude on the upper surface of the lower electrode when the lower electrode is raised. At the position where the lower electrode is lowered, the rod or bar has a round bar fall prevention device in which the lower part of the bar is fixed to the welder frame, and the lower electrode is laterally located on the side without the through hole or through groove. Slightly higher than the lower electrode, toward the lower electrode In a round bar welding machine characterized by having a slanting surface for supplying a round bar, or by using the lap resistance welding method, the upper electrode is a movable electrode for pressing. , A groove is provided on the upper surface of the lower electrode in the longitudinal direction of the electrode to form a welding positioning groove for a round bar to be welded, and a plurality of holes or grooves which penetrate the electrode vertically on the sides of the groove. Is provided in each of the electrode through hole or the electrode through groove, and has a length that does not project to the upper surface of the lower electrode when the upper electrode is raised and does not project to the upper surface of the lower electrode when the upper electrode is lowered. A rod or a bar is slidably mounted, and the rod or the bar lower part is connected to the upper and lower devices of the upper electrode, or individually equipped with a rod or a bar upper and lower device,
It has a round bar fall prevention device that can be moved up and down by interlocking with the vertical movement of the upper electrode. It is slightly higher than the lower electrode on the side of the lower electrode where there is no through hole or through groove. It is characterized by being inclined toward the lower electrode and equipped with a separate lifting device, or by having a rod or a bar and a round bar supply slope that can be moved up and down in conjunction with the vertical movement of the upper electrode. It is a round bar welder.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a perspective view of a round bar welding machine according to claim 1 of the present invention. The lower electrode (1) of the two upper and lower electrodes of the lap resistance welding machine is used as a movable electrode for pressurization, and the upper surface (3) of the lower electrode has a substantially V shape over the entire length of the lower electrode. The welding positioning groove (4) of the round bar to be welded is provided, and a plurality of electrode through holes (5) or electrode through grooves (6) are formed along one side of the welding positioning groove along the groove.
Is provided in each of the electrode through hole or the electrode through groove,
When the lower electrode is lowered, it is projected on the upper surface of the lower electrode, and when the lower electrode is raised, a rod having a length that does not protrude on the upper surface of the lower electrode or a bar (7) is slidably mounted, and this rod is attached. Alternatively, the lower part (8) of the bar is fixed to the welder frame (9), and the lower electrode is hung on the side of the lower electrode where there is no through hole or through groove. It is provided with a round bar supply slope (10) that is slightly higher than the lower electrode at the position and inclines toward the lower electrode.

The welding of the round rod welding machine of the present invention will be described. When the worker lowers the lower electrode of the lap resistance welding machine, in other words, when the upper and lower electrodes are open, the round rod is fed. When the round bar is placed on the working slope (10), the round bar rolls on the round bar supplying slope and reaches the upper surface of the lower electrode (1), but projects to the upper surface of the lower electrode when the lower electrode is lowered. The progress is stopped by a plurality of rods or bars (7), and it is guided and held in the welding positioning groove (4) of the round bar. Next, after the member to be welded is placed on the round bar held on the lower electrode so as to intersect with the round bar, the electrode is energized and pressurized, and the lower electrode rises as the lower electrode rises. The round bar held in the welding positioning groove of the round bar on the upper surface of is joined to the member to be welded placed so as to intersect with the round bar. At this time, a plurality of rods or bars protruding from the upper surface of the lower electrode in a state where the lower electrode is lowered are fixed to the welder frame (9) at the lower portion (8) of the rod or bar. , A plurality of electrode through holes provided in the lower electrode (5)
Alternatively, since it is slidably attached to the electrode through groove (6), the electrode through hole or the electrode through groove is not left behind when the lower electrode rises and does not project on the upper surface of the lower electrode. Since it is stored, welding can be performed without any problems.

At one of the welding positioning grooves of the lower electrode, there is always a round bar supplying slope slightly higher than the lower electrode and inclined toward the lower electrode at the position where the lower electrode is lowered,
On the other side, there is a rod or a row of bars that protrudes to the upper surface of the electrode at the lower position of the lower electrode, so that the round bar held in the welding positioning groove of the round bar on the upper surface of the lower electrode is The electrode will not be dislocated from its normal position due to vibration accompanying the rise of the lower electrode, and the damage to the electrode will be reduced. As a result, stability on the lower electrode of the round bar can be maintained for a long period of time. It was. Further, the welding operator can place the round bar to be welded on the round bar supply slope (10), which is located at a distance from the electrode, so that the round bar can be placed at a proper position on the lower electrode. As a result, it has become possible to be freed from the dangerous work of approaching the electrodes.

FIG. 2 is a perspective view of a round bar welding machine according to claim 2 of the present invention. Opposite top and bottom of lap resistance welding machine 2
Of the individual electrodes, the upper electrode (11) is used as a movable electrode for pressurization, but a substantially V-shaped groove is provided on the upper surface (3) of the lower electrode over the entire length of the lower electrode so The welding positioning groove (4) is provided, and a plurality of electrode through holes (5) or electrode through grooves (6) are provided along one side of the welding positioning groove, and the electrode through hole or the electrode through groove is formed. Each of the rods is slidably mounted with a rod or bar (7) of a length that protrudes on the upper surface of the lower electrode when the lower electrode is lowered, and does not protrude on the upper surface of the lower electrode when the lower electrode is raised. Then, the lower part of the rod or bar is connected to the upper / lower device (12) of the upper electrode, or individually equipped with a rod or bar up / down device (13), which is interlocked with the vertical movement of the upper electrode. As a round bar fall prevention device that can be moved up and down On the side without through-holes or through-grooves of the lower electrode, slightly higher than the lower electrode, inclined toward the lower electrode, individually equipped with a vertical device, or with a rod or bar It is provided with a round bar supply slope (10) that can be moved up and down in conjunction with the vertical movement of the upper electrode. Of the two electrodes facing each other in the vertical direction of the lap resistance welding machine, the upper electrode is the movable electrode for pressurization, and the lower part of the rod or bar is connected to the upper / lower device (12) for the upper electrode, or individually. In comparison with the round bar welding machine according to claim 1 of the present invention, the rod or bar up / down device (13) is equipped with the rod or bar up / down device (13) and is moved up and down together with the up and down movement of the upper electrode together with the slope for supplying the round bar. Although the mechanism is complicated, higher stability of the round bar can be obtained because the lower electrode is not moved.

[0012]

INDUSTRIAL APPLICABILITY The present invention, in a round bar welding machine using the lap resistance welding method, adds a simple round bar fall prevention device and a slope for supplying the round bar to the conventional round bar welding machine. It is easy for the placed member to move out of the proper position, which may result in inaccurate and strong joining, and for the operator to weld on the electrode of a round bar welder using the lap resistance welding method. In order to place the parts to be
This solves the problem that it is dangerous to work while approaching the electrodes.

[Brief description of drawings]

FIG. 1 is a perspective view of a round bar welding machine according to claim 1 of the present invention.

FIG. 2 is a perspective view of a round bar welding machine according to claim 2 of the present invention.

[Explanation of symbols]

 1 Lower electrode 2 Round bar welder 3 Upper surface of lower electrode 4 Welding positioning groove 5 Electrode through hole 6 Electrode through groove 7 Rod or bar 8 Rod or bar bottom 9 Welder frame 10 Round bar supply slope 11 Upper electrode 12 Upper electrode lifting device 13 Rod or bar lifting device 14 Round bar

Claims (2)

[Claims] 1. A round bar which uses a lap resistance welding method and uses a lower electrode (hereinafter, referred to as a lower electrode (1)) of two vertically opposed electrodes as a movable electrode for pressurization. In the welding machine (2), a groove is provided on the upper surface (3) of the lower electrode in the longitudinal direction of the electrode to form a welding positioning groove (4) for the rod to be welded, and the groove is vertically provided on one side of the groove. A plurality of holes or grooves penetrating the electrode is provided, and the electrode through hole (5) or the electrode through groove (6) is projected into the upper surface of the lower electrode with the lower electrode lowered. , A rod or bar (7) having a length that does not project onto the upper surface of the lower electrode when the lower electrode is raised is slidably mounted, and the lower part of the rod or bar (8) is welded to the welding machine frame. It has a round bar fall prevention device fixed to (9), and it has a through hole for the lower electrode or Is a round bar supply slope (1 that is slightly higher than the lower electrode at the position where the lower electrode is lowered and is inclined toward the lower electrode on the side without the through groove).
0) Round bar welding machine characterized by having. 2. A round bar which uses a lap resistance welding method and uses an upper electrode (hereinafter referred to as an upper electrode (11)) of two vertically opposed electrodes as a movable electrode for pressurization. In the welding machine (2), a groove is provided in the longitudinal direction of the electrode located below (hereinafter referred to as the lower electrode (1)) in the longitudinal direction of the electrode, and the welding positioning groove (4) ), And a plurality of holes or grooves are formed vertically on the side of the groove to penetrate the electrode, and each of the electrode through hole (5) or the electrode through groove (6) is provided with an upper surface. A rod having a length that does not protrude to the upper surface of the lower electrode when the electrode is raised and does not protrude to the upper surface of the lower electrode when the upper electrode is lowered, or a bar (7) is slidably mounted, Alternatively, the lower part of the bar is placed above and below the upper electrode (12).
Or a bar up / down device (13) individually equipped with a round bar fall prevention device that can be moved up and down by interlocking with the up and down movement of the upper electrode. On the side without holes or through-grooves, slightly higher than the lower electrode, inclined toward the lower electrode, individually equipped with a vertical device, or with the rod or bar, the upper and lower electrodes A round bar welding machine having a round bar supply slope (10) that can be moved up and down in conjunction with movement.