JPH0333072B2 - - Google Patents

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention relates to a copy seam welding machine, which is used to weld curved and straight parts of liquid containers made of steel plates, etc. by joining two together and forming a weld line on the horizontal joint surface. The structure is suitable for automatic seam welding of workpieces having the same structure.

(Conventional technology) The welding line of a workpiece that has curved and straight parts is
A large number of proposals have been made for copying seam welding machines that weld by welding a copying plate by passing it between the seam electrodes, but most of them consist of a means for mechanically restraining the copying mechanism. 1986-
Examples of this can also be found in Publication No. 42472 and Publication of Japanese Utility Model Application No. 60-42474. However, when using such a mechanical restraint configuration, it is technically difficult to reduce the turning radius of the corner or inside corner of the weld line, and furthermore, copying equipment is specialized, equipment costs are high, and the welding machine is It requires skill in manufacturing and adjustment, and it is easy to change the design, which has some drawbacks.

(Problems to be Solved by the Present Invention) The ability to weld faithfully following the welding line using a seam electrode is a factor that determines the quality of a copy seam welding machine, and efforts have been made to provide a technical solution to this problem. However, as long as means are taken to mechanically restrain the copying mechanism, it is difficult to provide a copying seam welding machine with excellent performance and versatility.

In the present invention, the copying mechanism is not mechanically restrained, and the seam welding is progressed by simply inserting and applying pressure to the weld line of the workpiece using the upper and lower seam electrodes, and the copying plate is connected to the copying rotation shaft to circumferentially. The problem is to develop a highly versatile profile seam welding machine that avoids complicating the configuration due to mechanically restraining surfaces.

(Means for Solving the Problems) The present invention aims to solve the problems described in the previous section, and is applied by inserting a copying plate and a weld line between seam electrodes on a copying rotation shaft. A member is attached with a frame that removably fixes the workpiece to be pressure welded in a fixed position, and its profiling rotation axis is pivotally supported on the side of the seam welding machine main body, and the free end moves freely in the horizontal direction.
A detecting end of a movable element movably supported at the free end, further approaching the front side of the seam electrode in the welding direction, and movable forward and backward, is brought into contact with the circumferential surface of the copying plate, and the reference position of the movable element is referenced. A displacement detector is installed to detect the deviation of the copying plate, and the displacement detector detects the deviation of the copying plate and commands the drive of a servo motor that reversibly rotates the copying rotation axis, so that the deviation of the copying plate becomes zero. It is characterized by the fact that it is corrected until it becomes .

(Function) Fig. 1 explains the principle of the present invention, in which the copying rotation shaft 11 to which the copying plate 14 of the stand for the workpiece W is attached is pivoted at its base on the side of the seam welding machine main body, and its free end is free. It is movably supported by the free end of the member 3 which moves horizontally in the direction. On the other hand, the upper and lower seam electrodes 2 of the seam welding machine main body press the weld line Wa of the workpiece W at the intersection F of the diametrical center line X-X' and the axial center line Y-Y', and The seam welding progresses by the rotation of 2, but since the profiling rotation shaft 11 is supported by the free end of the member 3, the workpiece stand 12 and the workpiece W move in the rotational direction with slight resistance, and the weld line Wa is not inserted between the seam electrodes and comes off, or the part inside the welding line Wa is inserted, making continuous seam welding impossible or defective. Conventionally, in order to eliminate such defects, the copying mechanism was mechanically always set at the intersection point F as described above.
However, since the disadvantages of this restraint are as described above, the present invention is generally implemented in consideration of the hypersensitivity of the response in the forward direction of the welding progress of the intersection point F. Distance xf from 0mm to 30mm
, and a displacement detector 21 is provided, and the moving detection end 22a of the detector, which moves approximately parallel to the center line Y to Y', is brought into contact with the circumferential surface of the copying plate 14, so that the workpiece welding line Wa is aligned with the center line X. −X′ and the movement detection end 22
The deviation detection of the displacement detector 21 is set as a reference position of zero when a touches the circumferential surface of the copying plate 14, and when the movement detection end 22a moves in the extension or retreat direction, the deviation detection on the circumference of the copying plate is made with reference to the reference position. positive or negative deviation of
ye is detected, a forward rotation or reverse rotation start command is given to the servo motor 16, the copying rotation shaft 11 is rotated in the forward direction or reverse direction until the deviation becomes zero, and the posture of the copying plate 14 with respect to the displacement detector 21 is determined. and the posture with respect to the intersection F of the workpiece welding line Wa is automatically corrected.

(Effects) The present invention has the above-described configuration and operation, and the copying plate 14 is attached to the copying rotation shaft 11 movably supported by the free end of the member 3 whose free end freely moves in the horizontal direction. The peripheral surface of the copying plate 14 is placed in front of the welding point F without any restraint other than its installation.
xf contacts the movement detection end 22a of the displacement detector 21 provided at the displacement detector 21, and the copying rotation shaft 11 is commanded to rotate in the forward or reverse direction by the signal of the deviation value ye detected by the displacement detector 21. It has a configuration in which a servo motor is provided, and even if the curve formed on the copying plate 14 is small, it can respond sensitively, and furthermore, the production of the copying plate 14 is simplified.
This has the effect of providing a seam welding machine that is easy to operate and is versatile.

(Embodiment) An embodiment of the present invention will be described with reference to FIG. 2 and the following drawings.

Reference numeral 1 denotes a seam welding machine main body, which includes a pair of upper and lower seam electrodes 2 that rotate. The seam welding machine main body 1 is provided with a member 3 whose free end can move freely in the horizontal direction by a shaft support. The arm 5 is pivotally supported, the first arm 5 and the second arm 6 are connected by a joint shaft 7, and the tip of the second arm 6 is a free end.

Reference numeral 11 is a copying rotation shaft whose shaft position can be moved in the horizontal direction, and a mounting plate (not shown) is provided at the upper end to attach a mount 12 for fixing the workpiece W in a fixed position in a freely attachable/removable manner. A gear 1 is equipped with a copying plate mounting plate 13 that fixes a copying plate 14 whose circumferential surface matches the weld line Wa of the work W in a freely exchangeable manner, and a second timing belt 19 is hung at the middle of the height.
5 will be provided.

16 is a servo motor, 17 is an electromagnetic clutch,
They are attached to the second arm 6 of said member 3.
18 is a first timing belt hooked between the output shaft of the servo motor 16 and the input shaft of the electromagnetic clutch 17;
19 is the output shaft of the electromagnetic clutch 17 and the gear 1 mentioned above.
5 is the second timing belt.

The copy rotating shaft 11 has a sleeve 20 above the gear 15.
and attach the free end of the second arm 6 of said member 3 to the sleeve 20.

21 is a displacement detector attached to the seam welding machine main body 1 side immediately in front of the welding point F of the upper and lower seam electrodes 2; The movement detection end 22a is brought into contact with the circumferential surface of the copying plate 14. When the welding line Wa of the work W is located at the front xf of the welding point F and on the diametrical center line The movement detection end 22 is set so that no deviation is detected.
When a moves forward or backward from the neutral position, the potential is increased to detect the deviation ye, and the detection signal commands the servo motor 16 to start in the forward or reverse direction, until the low potential is restored. i.e. deviation
Drive the servo motor until the detection of ye is cancelled, and perform the correction described in the operation section.

The electromagnetic clutch 17 is an electric member used for the purpose of "disengaging" the clutch in order to imitate the rotation of the servo motor 16 and not transmit it to the rotating shaft 11 even if the servo motor 16 is driven when converting the workpiece W, and is not directly related to the present invention. There is no.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of the principle of the present invention, Fig. 2 is a perspective view showing an embodiment of the present invention, and Fig. 3 is a copying plate 14.
FIG. 3 is an enlarged plan view showing the relationship between the movement detection end 22a and the movement detection end 22a. W → workpiece, Wa → welding line, 1 → seam welding machine body, 2 → seam electrode, 3 → member, 11 → copying rotation axis, 12 → mount, 14 → copying plate, 16 → servo motor, 21 → displacement detector , 22 → mover, 22
a→Movement detection end.

Claims (1)

[Scope of Claims] 1. A seam welding machine, in which a copying plate and a stand for fixing a workpiece to be press-welded at a fixed position by inserting a welding line between seam electrodes and removably attaching it to a fixed position are attached to a copying rotation shaft. The copying rotation shaft is supported by the free end of a member that is pivotally supported on the main body side and has a free end that freely moves in the horizontal direction, and is further moved forward and backward by approaching the front of the seam electrode in the welding direction. A displacement detector is installed in which the detection end of the slider contacts the circumferential surface of the copying plate and detects the deviation of the copying plate with respect to the reference position of the slider, and the displacement detector detects the deviation of the copying plate. A copying seam welding machine characterized by commanding the drive of a servo motor that reversibly rotates a copying rotation axis and correcting the deviation of a copying plate until it becomes zero.