JPH0735659Y2 - Seam welding equipment - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a seam welding apparatus used in a steel process line or the like.

[Conventional technology]

FIG. 2 shows, for example, Japanese Patent Laid-Open No. 2-20669 and Japanese Utility Model Laid-Open No. 60-171674.
It is a block diagram which shows the basic structure of this kind of conventional seam welding apparatus disclosed by the publication. In the figure, (1) is a U-shaped carriage frame, the lower arm (1a) of which is welded to a material (4) to be welded via wheels (3) capable of traveling on a guide rail of a base frame (2). It is movably supported along the section. In (5), one is from the upper arm (1b) of the carriage frame (1) and the other is the lower arm (1a).
A pair of rotatable disc-shaped welding electrodes respectively supported from the upper and lower sides press and hold the welded portion of the material to be welded (4) from above and below by moving the carriage frame (1) to rotate and run, not shown. The power is supplied from the power supply device and the welding part is energized to perform the welding. Similarly, (6) is a rolling roll on a pair of rotatable disks supported by the lower arm (1a) and the upper arm (1b) of the carriage frame (1) by moving the carriage frame (1). The welded portion of the material to be welded (4) is pressed and held from above and below by a predetermined pressure to rotate and run. (7) and (8) are upper and lower shears that cut the end of the material to be welded (4) prior to welding, and are supported by the upper arm (1b) and the lower arm (1a), respectively.

Next, the operation will be described. First, the operation when so-called narrow lap seam welding is performed using the above apparatus will be described with reference to the process explanatory view of FIG.

First, the ends of the clamped material (4) to be welded are cut by the upper shear (7) and the lower shear (8), and the ends are superposed on each other by a minute dimension (Fig. 3 (a)). From this state, the carriage frame (1) is moved to the right on the base frame (2) from the position shown in FIG. Along with this, the welding electrode (5) presses and holds the welded portion of the material to be welded (4) from above and below to rotate and run to sequentially perform welding by energization (Fig. 3 (b)). This welded part is the welding electrode (5)
It is rolled and finished by a rolling roll (6) located at the rear of (Fig. 6 (c)).

FIG. 4 illustrates the process of so-called narrow lap seam welding with pre-plap operation. In this case, the ends of the materials to be welded (4) cut at the same time are overlapped with each other by a small dimension (FIG. 4 (a)). , The carriage frame (1) is moved, and at a room temperature, it is once rolled by the rolling rolls (6) to reduce the thickness of the overlapped portion ((b) in the figure), and the carriage frame (1) is returned to the original position. . Then, after slightly reducing the overlapping amount ((c) in the same figure), the carriage frame (1) is moved again, welding is performed by the welding electrode (5) ((d) in the same figure), and further finished by rolling. Is performed ((e) in the figure).

[Problems to be solved by the device]

By the way, since the welding electrode (5), the rolling roll (6), and the upper shear (7) and the lower shear (8) are supported by the lower arm (1a) and the upper arm (1b) of the carriage frame (1), All of the repulsive forces that act when these are operated in the process of
a) and upper arm (1b). Therefore, since the carriage frame (1) needs to have sufficient rigidity against these repulsive forces, its size and weight tend to increase.

Conventionally, the material to be welded has mainly been ordinary steel, and its expansion force is
It was about 40-60kg / mm ² , but recently high tensile strength materials of 100-150kg / mm ² or more have been used, and along with this, shear cutting force, welding electrode (5) and The pressing force of the rolling roll (6) becomes large, for example, 3 to 10 tons
The repulsive force becomes a certain degree, and the carriage frame (1) becomes huge.

As a result, there is a problem that the size of the entire apparatus is increased, the welding speed determined by the traveling speed of the carriage frame (1) is decreased, and the processing time is increased.

The present invention has been made to solve the above problems, and is intended to reduce the size and weight of the carriage frame and to improve the welding speed accordingly.

[Means for Solving the Problems]

A seam welding apparatus according to the present invention comprises an upper frame having both ends attached to a base frame and arranged in parallel with the base frame, and an upper support mechanism interposed between an upper arm and an upper frame of a carriage frame,
Together with the lower part, these support mechanisms are composed of linear motion guide bearings.

[Action]

The repulsive force that acts when the welding electrode is operated is not only received by the upper and lower arms of the carriage frame, but shared by the base frame and the upper frame that is integrated with this base frame via both support mechanisms. The force acting on the carriage frame itself is reduced accordingly.

〔Example〕

FIG. 1 is a block diagram showing a seam welding apparatus according to an embodiment of the present invention. In the figure, what is different from the conventional one is that an upper frame (9) is newly provided. That is, the upper frame (9) is arranged in parallel with the base frame (2), and both ends of the upper frame (9) are supported by the columns (10).
It has a box-shaped structure attached to the. (11) is the upper arm (1b) and upper frame (9) of the carriage frame (1)
And a wheel serving as an upper support mechanism provided between the vehicle and the vehicle via a guard rail (not shown). Therefore, in this embodiment, the lower arm (1a) of the carriage frame (1) has the wheels (3).
And the upper arm (1b) of the carriage frame (1) is supported by the upper frame (9) via the wheels (11).

In this case, the procedure of the welding work is exactly the same as the conventional one, but the welding electrode (5), the rolling roll (6) and the upper shear (7).
The repulsive mechanical force acting when operating the lower shear (8) is not received only by the carriage frame (1), but via the wheels (3) and (11) to the base frame (2).
And the upper frame (9).
By setting the dimensional accuracy of the wheels (11) (3) and the mechanism between them and the guide rails, and the rigidity of the upper frame (9) to an appropriate level, the above-mentioned upper frame (9) side is moved. Can be increased. From this point of view, as the support mechanisms (3) and (11), it is more preferable to use, for example, a linear guide bearing or the like, rather than the wheel and guide rail shown in FIG. 1, especially the finish after welding. This is effective when the thickness is required with extremely high accuracy and the pressure applied by the rolling roll (6) or the like is high.

In this way, the repulsive force from the welding electrode (5) and the like is shared by the upper frame (9) side, so the rigidity and yield strength required for the carriage frame (1) itself is reduced, and it is possible to reduce its size and weight. . As a result, the inertia of the carriage frame (1) is reduced, and high-speed traveling is possible with a driving device having a relatively small capacity. Therefore, the welding speed is improved and the welding processing time is shortened without increasing the size of the apparatus.

In the above embodiment, the case where the upper frame (9) is attached to the base frame (2) has been described, but when the base frame (2) is firmly installed on the foundation of the equipment, the upper frame (9 9) may be attached to a column from this foundation, and the present invention includes such a case.

Further, this invention is mainly intended for a so-called C-frame type guillotine shear type narrow lap seam welder which is mainly used in a steel process line, but is not limited to only a seam welder in this field, and is not limited to general metal. It is needless to say that the present invention can be widely applied to a narrow plate seam welding system in the processing field, and further to a metal plate welding device of a narrow lap seam welding system with a pre-lap operation.

[Effect of device]

Since the present invention is configured as described above, the rigidity and mechanical force required for the carriage frame are reduced, the size and weight are reduced, and the size of the apparatus and the welding time can be shortened.

[Brief description of drawings]

FIG. 1 is a block diagram showing the basic structure of a seam welding apparatus according to an embodiment of the present invention, FIG. 2 is a similar block diagram showing a conventional seam welding apparatus, and FIGS. 3 and 4 are welding steps. FIG. In the figure, (1) is a carriage frame, (1a) and (1b) are lower and upper arms of the carriage frame (1), respectively, (2) is a base frame, (3) is a wheel as a support mechanism, and (4). Is the material to be welded, (5) is the welding electrode,
(9) is an upper frame, and (11) is a wheel as an upper support mechanism. In the drawings, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] 1. A U-shaped carriage frame provided so as to be movable along a welded portion in which end portions of materials to be welded are overlapped with each other by a predetermined size, and the welding is supported by parallel upper and lower arms of the carriage frame. A pair of welding electrodes that press the parts from above and below to energize and weld, and a linear motion guide bearing that is interposed between the lower arm of the carriage frame and the base frame and movably supports the lower arm from the base frame. The support mechanism, the upper and lower ends of the carriage frame in the front and rear in the moving direction are attached to the base frame and are arranged in parallel with the base frame, and the carriage frame can be relatively moved between the upper arm and the upper frame. A part of the repulsive force from the welding electrode due to the pressure applied to the carriage frame in cooperation with the support mechanism. Seam welding apparatus characterized by comprising an upper support mechanism consisting of linear guide bearing for transmitting the serial upper frame and the base frame.