JPS591092A - Butt welding method of coil materials - Google Patents

Abstract

PURPOSE:To assure high butting accuracy and to obtain a good result of welding without any strain in the butt end parts, by controlling stepwise the moving speed for butting coil materials. CONSTITUTION:The end part of a preceding coil S1 moving in an arrow direction and the top part of a succeeding coil material S2 are clamped respectively by means of the upper and lower clamps 2a, 2b and 3a, 3b of clamping devices 2, 3 on a stationary side and a movable side. A cutting device 1 is advanced into between both devices 2 and 3 by a driving device 7 and is stopped on the line, then the lower blade 6 of the device 1 is moved upward to a home position by a cylinder 6a, whereafter an upper blade 5 is moved downward by a cylinder 5a to cut the end parts of the materials S1, S2. The device 3 is advanced at a high speed by a cylinder 11, and is stopped apart at a spacing (e) just prior to butting. A backing strip 12 is pressed in the butt end parts of the materials S1, S2 and the cut end parts are sandwiched from the bottom side of the clamps 2a, 2b. The device 3 is advanced this time at a low speed to butt the end parts of the materials S1, S2; thereafter, the butt parts are welded along the butt line by a welding torch 21.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a welding method for joining a preceding coil material and a succeeding coil material. The purpose is to eliminate distortion at the butt ends and ensure high butt accuracy by controlling the speed in stages. In general, thin coil materials are connected by end welding or laser welding. In this case, it is necessary to obtain a highly accurate butt surface as a condition for performing accurate butt welding. Therefore, in the past, it has been common practice to adjust the ends of the coil material so that they abut against each other with a little bit of pressure.

However, in the conventional case, when the ends of the coil materials are abutted with slight pressure, the abutted ends tend to bend as shown in FIG. 1, making it impossible to obtain an accurate butt state.

Therefore, in the conventional welding method, the moving speed when butting the coil materials is constant, and the backing metal is pressed against the lower surface of the butt line after the ends of the coil materials have been butted. Breaking away from the fixed idea of 1, the above movement speed is fast in the first stage, and slow in the second stage while pressing the backing metal against the welding area of the butt end. Below 0, which solves the problem,
Embodiments of an apparatus for carrying out the method of the present invention will be described in detail based on the drawings.

Fig. 1 is a side view showing the entire coil connection welding machine according to the method of the present invention, and Fig. 2 is a front view thereof. , (3) C shows the movable side clamp device.

The cutting device (1) is connected to the upper arm (
4a) and the lower arm (4b), the upper blade (5) and the lower blade (6)
), one upper blade (5) is fixed to the upper arm (4a) and moves up and down by nine cylinders (5a) (5b) (5C), and the other lower blade (6) is fixed to the lower arm (4b). It is designed to move up and down by cylinders (6a) (6b) (6c) fixed to.

The whole cutting device is provided with rails so that the C-shaped frame (4) moves between the stationary clamp device (2) and the movable clamp device by a drive device (7), for example, a cylinder, in a direction transverse to the coil material. (8) Move above (8).

Fixed side clamp device (2) and moving side clamp device (3)
are arranged in opposite directions on the fixed base (9).

Both upper clamps (additional) and (3a) t! , a cylinder (2C) fixed to each upper frame (10) (10) (
3c) moves up and down relative to the lower clamps (2b) and (3b) to clamp or open the end of the fill material (width) fed onto the line.

The moving side clamp device (3) is the fixed side clamp device (2).
), the upper plate (9a) of the fixed base (9) is driven by a driving power device such as a drive cylinder (1
It operates according to 1).

Reference numeral (10) denotes a backing metal lifting mechanism, which is composed of a folding link mechanism and is installed symmetrically on the left and right sides of the welding machine.

(12) In the H backing metal, the copper "tfc" having a length equivalent to the full length of the butt wire is made of copper alloy. (13)
is a companion drive cylinder that swings and drives the link mechanism of the backing metal (11).

FIG. 3 is an explanatory diagram of the operation of the present invention.

Leading coil # (8t) and following coil i/A182) Ir
1. Flows on the line like an arrow. The terminal end of the preceding coil material and the tip end of the succeeding coil material are secured to the upper and lower clamps (2) of the fixed side and moving side clamping devices (2) and (3), respectively.
a) Clamp according to (2b) and (3a) (3b) (simplified d).

Next, a cutting device (1
The line is advanced by the drive (7) and stopped on the line. Then, after the lower blade (6) of the cutting device is raised by the cylinder (6a) at the fixed position 1, the upper blade (5) is moved up by the cylinder (6a).
5a) and cut the ends of both coil materials (81) and (82) (after cutting the FEIblo, the cutting device (1)
Return to Helloline. Next, the movable clamp device (3) is moved forward at high speed by the cylinder (11),
Stop at a distance (e) that is just before the butt (throat c)
) Next, operate the backing metal lifting mechanism 10), press the backing metal (12) against the butt end of the coil material, and pinch the cut end from the bottom of the upper clamp (2a) (2b). Then, the movable side clamp device (3) moves forward at low speed and abuts the ends of both coil materials (Wd recommendation).

Here, to explain an example of controlling the butt movement speed of the coil material, as shown in Fig. 4, the fluid supplied from the fluid source (14) passes through the operating pressure reducing valve (15). , solenoid valve (16) port (
8) and enters the pressure chamber (a) of the drive cylinder (11) of the movable clamp device (3) through the pilot check pulp (17), and moves the movable clamp device forward at high speed. During this time, the fluid in the return chamber (b) of the drive cylinder (11) passes through the solenoid pulp (19) when the piston rod (1la) activates the limit switch (18) at a predetermined position. (20
) and return to the tank. When the limit switch (18) operates just before the butt, the solenoid valve (20) closes in response to an electric signal, and the drive cylinder (11) is reduced to the preset speed through the Pl fluid tz speed controller (21). and move side clamping device (
3) Advance. In this way, the butting speed is controlled by the two-stage stroke, and a reliable butting state can be obtained. Now, returning to the explanation of the series of operations, as shown in Fig. 3e, the butt line of the carp/I' material (8, 1) (82) is linearly butted with the gap zep, fc, and then the welding torch (
21) is driven at the welding start point 1, and welding begins along the butt line. (O'l) The drive mechanism for the welding torch (22) is not shown in the figure, but is generally known. The welding torch (22) is attached to a torch carriage having a position adjustment mechanism as shown in FIG. After welding, each clamp device (2
) (3) is released and the strip is transported to the next process.

All movable devices are then returned to their original positions in preparation for the next operation.

As explained above, according to the present invention, the speed of the butt movement period of the coil material is controlled step by step, and the bracing metal is pressed against the welding area during the transition period from just before butt to the welding area. !Since the fill material is moved at low speed and butts against each other, even when butt welding thin plates, the butt ends can be accurately butt-welded without bending, resulting in stable and good welding results. .

[Brief explanation of the drawing]

Fig. 1 is a side view of a welding machine for connecting coil materials according to the method of the present invention, Fig. 2 is a front view thereof, Fig. 3 is an explanatory diagram of the operation of the welding machine according to the method of the present invention, and Fig. 4 is a coil material connection welding machine according to the method of the present invention. FIG. 7 is an explanatory diagram of an operation related to speed control during a material butting movement period. . (2), (3 doors... Fixed side and movable side clamp device (1
1)... Drive power unit (12)... Backing money (S
)...Coil material patent applicant: Dengensha Seisakusho Co., Ltd. Kawasaki Steel Corporation

Claims (1)

[Claims] 1. After clamping the ends of the preceding coil material and the ends of the following coil material using the fixed and movable clamp devices, respectively, and trimming the ends of both coil materials, When aligning, butting, and welding the entire length of the butt line, when the coil material on one moving side is moved forward to the coil material on the other fixed side and butted, the first stage is at high speed 1 just before the butt. A method for butt welding fill material, characterized in that the moving speed of the moving side clamp device is controlled step by step so that the material is moved forward at a low speed and then brought into contact at a low speed in the second stage. 2. In the method according to claim 1, the coil material is characterized in that in the second stage, a backing metal is pressed against the abutting area of both the coil materials and abutted in the next state. Butt welding method.