JP3167743B2 - Work clamp device for vertical automatic welding machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a work clamping device for a vertical automatic welding machine, and more particularly to a work clamping device provided in a vertical automatic welding machine.

[0002]

2. Description of the Related Art In general, a vertical automatic welding machine is composed of a vertically movable welding torch, a suspended movable carriage movable up and down and back and forth, and a work clamp mold attached thereto. And a work clamp device including a work contact member, wherein the work piece placed on the work table is pressed against and fixed to the work stop member by the work clamping die, and the work piece Welding is performed on a vertically welded portion by vertically moving (moving up and down) the welding torch.

Conventionally, a pair of abutting members provided in a vertical welding machine are in the form of a barrier and constitute a gap for welding work extending vertically between them, whereas a movable carriage has It is generally vertically long, and when clamping an object to be welded, it descends from a retracted position above the work table, then moves forward and presses the object to be welded against the abutting member by a work clamping mold.

[0004]

In the work clamping apparatus as described above, the interference between the movable carriage and the work to be welded causes the three-piece work to be welded at the back of the work.
In some cases, the workpiece cannot be pressed against the abutting member by the work clamping mold, and the workpiece cannot be clamped. As a specific example, as shown in FIG. 6, when the box-shaped workpiece W is rolled over and the back corner A is welded in a posture where the opening O is located forward, the depth of If the height d is large, the movable carriage collides with the edge e of the opening O, and the work clamping die of the movable carriage does not reach the back corner A, so that the clamp cannot be performed. On the other hand, if the work clamp mold is long, the work clamp mold collides with the upper surface a of the workpiece W when the movable carriage is lowered, so that the work clamp cannot be clamped.

[0005] In addition, in the work clamp device as described above, the work to be welded is not a simple rectangular object, but depending on the shape of the work to be welded, such as a panel-like work having an inclined portion.
There are cases where the workpiece cannot be reliably clamped or where clamping is quite difficult.

[0006] Welding by a vertical automatic welding machine is possible even if the workpiece is not clamped by a work clamping device. However, in this case, it becomes difficult to perform stable welding, and in addition, the welding portion is not welded. When the vicinity is not sufficiently suppressed, welding quality is adversely affected, such as occurrence of burning distortion in the workpiece.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems in a conventional work clamping apparatus of a vertical automatic welding machine. It is an object of the present invention to provide a work clamping device for a vertical automatic welding machine capable of appropriately clamping various kinds of workpieces.

[0008]

SUMMARY OF THE INVENTION According to the present invention, there is provided a welding torch which is movable in a vertical direction. In a work clamp device of a vertical type automatic welding machine that performs welding by moving the welding torch, a slide base member that is provided to be movable in a horizontal direction and is fixed at an arbitrary moving position; A vertical shaft member movably mounted and fixed at an arbitrary height position, and provided on the vertical shaft member so as to be rotatable around a vertical axis thereof and selectively fixed at an arbitrary rotation position around the vertical axis line; A rotating base member, a clamp arm extending in the horizontal direction, movably attached to the rotating base member in the extending direction, and fixed at an arbitrary moving position, and a tip end of the clamp arm. Vertical axis A clamp head member rotatably mounted around and selectively fixed at an arbitrary rotation position about a vertical axis, and a work clamp mold mounted on the clamp head member so as to be able to move back and forth by a back and forth actuator. A work clamp device for a vertical automatic welding machine, characterized by having a mold holder attached to move the work clamp mold forward and backward with respect to the abutting member.

[0009]

According to the above construction, the horizontal movement position of the slide base member, the height position of the vertical shaft member, the rotation position of the rotation base member around the vertical axis, and the movement position of the clamp arm in the horizontal direction. In other words, by adjusting the amount of horizontal protrusion of the clamp arm from the rotation base member and the rotation position of the clamp head member about the vertical axis, the mold holder is brought to the front position of the abutment member. Then, the workpiece is pressed back and forth against the abutting member by the work clamping die by being moved back and forth by the back and forth actuator, and is released.

[0010]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 5 shows an embodiment of a vertical automatic welding machine provided with a work clamping device according to the present invention as an auxiliary work clamping device. The vertical automatic welding machine 1 includes a base 3 and an upper frame 5 erected on the base 3.
Has a work table 7 on which an object to be welded is placed.

A machining head 11 equipped with a welding torch 9 is provided on the upper frame 5 so as to be movable in each of the X-, Y-, and Z-axis directions, in other words, in the vertical and horizontal directions. Have been.

A pair of barrier-like abutment plates 13 are provided upright on the base 3 on the back side of the work table 7. The pair of abutting plates 13 are provided on the elevating table 15 and constitute a gap G for welding work that extends vertically between them.
The welding torch 9 moves up and down along the welding work gap G to perform welding.

The upper frame 5 is provided with an L-shaped support arm 17 located above the work table 7. The support arm 17 has a movable carriage 19 on each of the coordinate axes in the Y-axis direction and the Z-axis direction. In other words, it is attached so as to be movable in the up-down direction and the front-back direction. A work clamp mold 21 is attached to the movable carriage 19, and the work clamp mold 21 presses an object to be welded against the abutment plate 13 by moving the movable carriage 19 in the vertical direction and the front-rear direction. Clamping is performed.

The base 3 is provided with an auxiliary work clamp device 23. This work clamp device 23
Is an X-axis linear guide 25 mounted horizontally on the front surface of the base 3 in the X-axis direction, as shown in FIGS.
The slide base member 27 is engaged with the X-axis linear guide 25 so as to be able to reciprocate in the X-axis direction. The slide base member 27 is fixed at an arbitrary moving position with respect to the X-axis linear guide 25 by a lock screw 29.

The slide base member 27 is provided with a support hole 31 vertically penetrating therethrough, and a vertical shaft member 33 is fitted into the support hole 31 so as to be vertically movable. Rack teeth 35 are formed on the vertical shaft member 33, and a pinion (not shown) built in the slide base member 27 meshes with the rack teeth 35. This pinion is Z
The shaft drive motor 37 is driven to rotate. Therefore, the vertical shaft member 33 is driven in the vertical direction, that is, the Z-axis direction by the Z-axis drive motor 37, and is fixed at an arbitrary height position.

At the upper end of the vertical shaft member 33, a rotation base member (r-axis base member) 39 is provided so as to be rotatable around the vertical axis. The rotation base member 39 is selectively fixed to an arbitrary rotation position around the vertical axis with respect to the vertical shaft member 33 by a lock screw 41.

The rotating base member 39 supports a horizontally extending clamp arm 43 movably in the extending direction. A rack tooth 45 is formed on the clamp arm 43, and a pinion (not shown) built in the rotation base member 39 meshes with the rack tooth 45. This pinion is driven to rotate by an r-axis drive motor 47. Accordingly, the clamp arm 43 is driven in the horizontal direction by the r-axis drive motor 47, is fixed at an arbitrary moving position, and the amount of protrusion from the rotation base member 39 is adjusted.

A clamp head member 49 is attached to the distal end of the clamp arm 43 so as to be rotatable about a vertical axis by a pivot 51. The clamp head member 49 is selectively fixed at an arbitrary rotation position around the axis of the pivot 51 by a lock bolt (not shown).

A fluid pressure cylinder device 53 as a forward / backward actuator is attached to the clamp head member 49, and a die holder 57 is attached to the piston rod 55 thereof.
Is fixedly mounted. A work clamp mold 59 is detachably attached to the mold holder 57.

The workpiece W is clamped by the work clamp device 23.
Is performed, the movable carriage 19 is first retracted to the raised position, and the workpiece W is placed on the work table 7 so that the opening O is positioned forward as shown in FIGS. Place on.

Next, a work clamp mold 59 having a size corresponding to the size of the workpiece W is attached to the mold holder 57,
The mounting height of the vertical shaft member 33 is adjusted by the Z-axis motor 37 according to the size of the workpiece W, and the slide base member 27 is moved to the X-axis linear guide in accordance with the opening direction of the opening O of the workpiece W. 25 to adjust the mounting position in the X-axis direction.

Next, the rotation base member 39 is connected to the vertical shaft member 3.
3, the turning position of the turning base member 39 is adjusted such that the turning arm is turned around the vertical axis so that the clamp arm 43 can enter the opening O of the workpiece W into the inside thereof. Thereafter, the clamp head member 49 is connected to the pivot 51.
The clamp head member 4 is rotated so that the work clamp mold 59 together with the mold holder 57 faces the welding gap G between the pair of abutment plates 13 from the front.
Adjust the turning position of 9.

In this case, as shown in FIG. 3, the mounting angles of the pair of abutment plates 13 are adjusted so that they are at 90 degrees to each other.

After the above adjustments are completed, the r-axis motor 4
7, the clamp arm 43 is advanced, the tip side of the clamp arm 43 is inserted into the workpiece O through the opening O of the workpiece W, and the mold holder 57 is moved together with the clamp head member 49 into the workpiece W.
And the welded portion A at the back corner of Next, the mold holder 57 is advanced by the fluid pressure cylinder device 53, and the work clamping mold 59 is brought into contact with the welded portion A of the workpiece W, which is pressed against the pair of abutting plates 13. Thus, the clamping of the workpiece W is completed.

When the welding torch 9 moves vertically in this clamped state, the welding portion A of the workpiece W is welded from the welding gap G.

After the welding is completed, when the clamp of the workpiece W is released, first, the work clamp mold 59 is retracted together with the mold holder 57 by the fluid pressure cylinder device 53.
Next, the clamp arm 43 is retracted by the r-axis motor 47 and is extracted from the workpiece W.

Thereafter, when the welding portion A on the opposite side of the workpiece W is to be welded, the arrangement position of the workpiece W is changed so that the welding portion A is located in the gap G for welding work. ,
In accordance with the change in the opening direction of the opening O accompanying this, the mounting position of the slide base member 27 in the X-axis direction, the rotation position of the rotation base member 39, The rotational position of the clamp head member 49 is changed so that the work clamp mold 59 together with the mold holder 57 faces the welding work gap G from the front, and the work to be welded is performed by the same operation as described above. W clamping is performed.

FIG. 4 shows a modified embodiment of the work clamping device according to the present invention. In this embodiment, the X-axis linear guide 25 is provided so as to be curved along an arc centered on the center of the welding work gap G, and the slide base member 27 is provided with the curved X-axis linear guide. It is guided by the guide 25 and moves in the X-axis direction.

In this case, regardless of the mounting position of the slide base member 27 on the X-axis linear guide 25, the protrusion length of the clamp arm 43 required for the clamp head member 49 to be at a required position. Becomes constant,
This makes the adjustment operation simple.

Although the present invention has been described in detail with reference to specific embodiments, the present invention is not limited to these embodiments, and various embodiments can be made within the scope of the present invention. Some will be apparent to those skilled in the art.

[0032]

As can be understood from the above description, according to the work clamping device for a vertical automatic welding machine according to the present invention,
The horizontal movement position of the slide base member, the height position of the vertical shaft member, the rotation position of the rotation base member about the vertical axis, the horizontal movement position of the clamp arm, in other words, the rotation base member of the clamp arm By adjusting the horizontal projection amount and the rotation position of the clamp head member about the vertical axis, the mold holder is brought to the front position of the abutment member, and this is moved forward and backward by the forward and backward actuator. Thereby, the work clamp mold presses the work piece against the abutment member and releases the work piece. Therefore, if the front part and the side part of the work piece are opened by an opening or the like, this is used as an entrance and exit. The work clamping mold approaches the welded portion at the back of the workpiece, and the workpiece is clamped appropriately. As a result, various types of workpieces can be appropriately clamped, and thus stable welding is performed under an appropriate work clamp state, and the vicinity of the welded portion is not sufficiently pressed during welding. As a result, it is possible to avoid problems such as the occurrence of burn distortion in the workpiece, and to perform welding with good welding quality.

[Brief description of the drawings]

FIG. 1 is a perspective view showing one embodiment of a work clamping device of a vertical automatic welding machine according to the present invention.

FIG. 2 is a side view showing an embodiment of a work clamping device of the vertical automatic welding machine according to the present invention.

FIG. 3 is a plan view showing one embodiment of a work clamping device of the vertical type automatic welding machine according to the present invention.

FIG. 4 is a plan view showing another embodiment of the work clamping device of the vertical automatic welding machine according to the present invention.

FIG. 5 is a perspective view showing an embodiment of a vertical automatic welding machine provided with a work clamping device according to the present invention as an auxiliary work clamping device.

FIG. 6 is a perspective view showing an example of an object to be welded.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Vertical automatic welding machine 3 Base 5 Upper frame 7 Work table 9 Welding torch 11 Processing head 13 Butt plate 19 Movable carriage 23 Work clamp device 25 X-axis linear guide 27 Slide base member 33 Vertical shaft member 39 Rotation base Member 43 Clamp arm 49 Clamp head member 53 Fluid pressure cylinder device 57 Mold holder 59 Work clamp mold

Claims (1)

(57) [Claims] 1. A vertically movable welding torch having a vertically movable welding torch, wherein the welding torch is vertically moved against a workpiece to be abutted against the abutting member to perform welding. In a work clamp device of a die automatic welding machine, a slide base member provided so as to be movable in a horizontal direction and fixed at an arbitrary moving position, and is attached to the slide base member so as to be vertically movable,
A vertical shaft member fixed at an arbitrary height position, and a rotation provided on the vertical shaft member so as to be rotatable around a vertical axis thereof and selectively fixed at an arbitrary rotation position about the vertical axis. A base member, a clamp arm extending horizontally and movably attached to the rotating base member in the direction in which the base member extends, and being fixed at an arbitrary moving position; A clamp head member rotatably mounted on the clamp head and selectively fixed to an arbitrary rotational position about a vertical axis; and a work clamp mold mounted on the clamp head member so as to be able to move forward and backward by a forward and backward actuator. A work clamp device for a vertical automatic welding machine, comprising: a mold holder to which the work clamp mold is attached and which moves the work clamp mold forward and backward with respect to the abutting member.