JPH09262681A - Lap welding machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lap welding machine where the rolling reduction pressure of planishing rolls is set easily and the welding part of lapped steel plates is rolled surely in a requiring thickness without generating marks like a sandal insect. SOLUTION: In a lap welding machine which is arranged on a process line to continuously produce a steel plate and which has a welding part 43 to lap the rear end part of an advancing plate and the top end part of a following plate and and to weld them, and planishing rolls 71, 74 to roll the deposited part 43 of the steel plate welded with this welding part 43, the planishing rolls 71, 74 are arranged so as to be crossed by a right angle to the transferring direction of the steel plate and the deposited part 43 is rolled to the transferring direction of the steel plate.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lap welding machine which is arranged in a process line for continuously producing steel plates and which welds the trailing end portion of a leading plate and the leading end portion of a trailing plate by overlapping them. It is a thing.

[0002]

2. Description of the Related Art Generally, in a continuous steel sheet production line, a plurality of coils, each of which has a substantially constant diameter, are wound and conveyed while being successively unwound to form a trailing end of a preceding coil and a leading end of a trailing coil. The parts are welded together.

FIG. 1 shows the layout of equipment on the entry side of such a continuous steel sheet production line. This entrance side equipment has two steel plate rewinding machines 1A and 1B, and coils for winding steel plates are set in these rewinding machines. The coil set in the rewinding machine 1A is rewound by stripping the steel plate tip from the coil by the coil tip feeding device 2A, and the rewound steel plate is passed through the sheet passing roller 3A, the sheet passing table 4A, and the sheet passing roller. After being conveyed to the roller straightening machine 6A through 5A, the curl is corrected there, the shearing machine 8A is passed through the plate passing table 7A.
And the defective tip shape portion or defective gauge portion of the steel sheet is sheared. After that, the threading table 9A and the threading roller 1
0A, the plate passing table 11A, and the plate passing roller 12A, and is conveyed to the lap welding machine 13.

Similarly, the coil set in the rewinding machine 1B is rewound by stripping the tip of the steel sheet from the coil by the coil tip feeding device 2B, and the rewound steel sheet is passed through the sheet passing roller 5B and the roller straightening roller. Machine 6B, plate passing table 7B, shearing machine 8B, plate passing table 9B, plate passing roller 10
B, the plate passing table 11B, and the plate passing roller 12B, and is conveyed to the lap welding machine 13.

In the coil conveyed to the lap welding machine 13, the rear end of the preceding coil and the front end of the following coil are overlapped and welded, and then the welded portion is rolled.
Such a lap welding machine 13 stacks a steel plate and a steel plate and applies an electric current while pressing the electrodes from above and below, welds the upper and lower plates by resistance heat generated there, and welds the welded portion to the width of the steel plate. There is known a mash seam welding machine that rolls in a single direction.
It is proposed in Japanese Patent No. 5241.

The operation of the mash seam welder 13 will be described below with reference to FIGS. Note that, here, a case will be described in which the lower pass steel plate 15 is being threaded and is switched to the upper pass steel plate 16. The upper pass steel plate 16 is sent to the mash seam welder 13 after the tip treatment, and as shown in FIG. 2, the center clamp operating air cylinder 17 is operated to pull up the entrance side center clamp 18 upward. It is clamped by the entry side upper clamp 19 and the entry side center clamp 18. After that, when the lower pass steel plate 15 stops being conveyed, as shown in FIG. 3, the inlet side upper clamp 19 and the inlet side center clamp 18 are integrally moved downward by the operation of the inlet side clamp operating hydraulic cylinder 20. Delivery Side Clamp Operation By the operation of the hydraulic cylinder 21, the delivery side upper clamp 22 moves downward. As a result, on the entry side of the mash seam welder 13, the upper pass steel plate 16 and the lower pass steel plate 15 are provided.
Is clamped by the entrance side upper clamp 19 and the entrance side lower clamp 23, and on the exit side of the mash seam welding machine 13, the lower pass steel plate 15 is clamped by the exit side upper clamp 22 and the exit side lower clamp 24. It

In this state, the shearing machine 25 is moved to the steel sheet conveying passage between the inlet side clamp and the outlet side clamp, and the shearing machine operating cylinder 26 is actuated to move the lower pass steel sheet 15 and the upper pass steel sheet 16 to each other. Is cut, and the leading-side rear end of the lower-pass steel plate 15 and the leading end of the upper-pass steel plate 16 to be welded by
Each clamp is aligned at a fixed distance from the clamps. Then, as shown in FIG.
Is retracted, and the hydraulic cylinder 2 that operates the inlet side clamp
By the operation of 0, the entrance-side upper clamp 19 and the entrance-side center clamp 18 integrally move upward while the upper path steel plate 16 is clamped. In this state, lower pass steel plate 1
The sheared entry side steel plate of 5 is wound around the line entry side.

Thereafter, as shown in FIG. 5, the inlet side clamp operating hydraulic cylinder 20 again operates to move the inlet side upper clamp 19 and the inlet side center clamp 18 downward together, so that the upper pass steel plate 16 is removed. In a state of being clamped by the entrance side upper clamp 19 and the entrance side lower clamp 23, the entrance side clamp is moved by the operation of an index device (not shown), and the preceding steel plate 15 and the following steel plate 16 are overlapped with each other at a predetermined margin. Set. In that state, the upper electrode wheel 27 and the lower electrode wheel 28 move in the width direction of the steel sheet while pressing down the overlap margin portion by the operation of the reduction cylinder 29, and weld the overlap margin portion.

Here, if the overlap portion is simply welded while being pressed down, the thickness of the welded portion 30 swells to about 200% of the plate thickness t of the steel sheet as shown in FIG. As it is, it may cause scratches or catches on the roll on the continuous line. Therefore, in the conventional mash seam welder 13, as shown in FIG. 7, a welding part rolling device (planish roll) having an upper roll 31 and a lower roll 32 rolls the welding part 30 in the steel plate width direction,
The thickness of the welded portion 30 is set to 130 to 150% of the plate thickness.

[0010]

In the above-mentioned conventional mash seam welding machine, in order to bring the thickness of the welded portion after rolling into the target value range, the welding by the planish roll is performed according to the hardness and thickness of the steel sheet. The pressure of the section is controlled. Normally, the hydraulic pressure is used as power for the pressure reduction by the polish roll.However, if pressure fluctuation occurs in the hydraulic pressure on the supply side, the pressure reduction by the polish roll is transmitted as it is to the welding part. The thickness of the part will change. For this reason, conventionally, the supply side hydraulic pressure is set to be high so that the welded part rolling thickness falls within the target value range even if pressure fluctuations occur.

However, when rolling the welded portion by the planish roll, it is important to climb up the welded portion first, and if the reduction pressure is set too high, the planish roll will be transferred to the welded portion 30, as shown in FIG. I didn't get on,
While the upper roll 31 and the lower roll 32 are in touch, the welded portion 30 is pressed in the traveling direction of the polish roll (steel plate width direction) to tear it off, or even if it gets up, the welded portion 3
There is a problem that a so-called scorpionworm 33 is generated due to a buckling phenomenon caused by rolling of 0. In addition, if the reduction pressure is set low in order to prevent the generation of the worms 33, there is a problem that the target thickness cannot be obtained.

From the above, in the conventional mash seam welding machine, there is a problem that it is difficult to set the pressing pressure of the planish roll, and it is not possible to effectively prevent the occurrence of the above-mentioned trouble, and the trouble occurs. There is a problem that it takes time to readjust the rolling pressure each time it occurs.

The present invention has been made by paying attention to the above-mentioned conventional problems, and the pressing pressure of the planish roll can be easily set, and the superposed welded portions of the steel plates can be formed without causing worms. It is an object of the present invention to provide a lap welding machine that is appropriately configured so that it can be reliably rolled to a desired thickness.

[0014]

In order to achieve the above object, the present invention is arranged in a process line for continuously producing a steel sheet, and a rear end portion of a leading plate and a leading end portion of a trailing plate are overlapped with each other. In a lap welding machine having a welding part to be welded together and a planish roll for rolling the welded part of the steel sheet welded at this welding part, the planish roll is a direction substantially orthogonal to the conveying direction of the steel plate. It is characterized in that the welded portion is arranged to be rolled in the conveying direction of the steel sheet.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION The worms generated in a conventional mash seam welder are that the rolling direction by the planish roll is the direction perpendicular to the conveying direction of the steel plate, and the rolling start position by the planish roll is from the steel plate. It is due to being off. In the present invention, in consideration of this point, the planish roll is arranged so as to extend in a direction substantially orthogonal to the conveying direction of the steel sheet, and the welded portion is configured to be rolled in the conveying direction of the steel sheet.

According to this structure, the planish roll is always on the steel plate, and the steel plate extends freely without being constrained in the rolling direction. There is no problem with the slip-in or buckling phenomenon due to rolling of the steel sheet. Therefore, the pressing pressure of the planish roll can be easily set, and so-called snail insects do not occur.

[0017]

9 and 10 are a front view and a right side view showing an embodiment of the lap welding machine of the present invention.
This lap welding machine rolls the welded part after the trailing end of the preceding coil and the leading end of the trailing coil are overlapped and welded, and from the upstream side to the downstream side of the steel sheet conveying direction. , Steel plate guide device 41, entry side clamp device 4
2, a welding part 43, a delivery side clamp device 44, and a polish roll device 45.

The steel plate guide device 41 includes a deflector roll 47 on the upper path and a deflector roll 4 on the lower path.
8, an upper pass entering side guide 49 and a lower pass entering side guide 50 are provided. Further, the inlet side clamp device 42 is provided with an inlet side upper clamp 51, an inlet side center clamp 52 and an inlet side lower clamp 53. Entry side upper clamp 5
1 and the inlet side center clamp 52 are configured to be integrally movable up and down by the operation of the inlet side clamp operating hydraulic cylinder 54, and the inlet side center clamp 52 is selectively raised by the operation of the center clamp operating air cylinder 55. Configure as possible. These clamps 51, 5
2, 53 and cylinders 54, 55 are provided integrally with the base frame 56 via a cross-adjusting device 57 and an indexing device 58 so as to be movable in the steel sheet conveying direction and the direction orthogonal thereto.

In the welded portion 43, a U-shaped carriage 60 that sandwiches the steel sheet conveying passage is provided so as to be movable with respect to the base frame 56 in a direction orthogonal to the steel sheet conveying direction. An upper electrode wheel 61 and a lower electrode wheel 62 for welding a steel plate can be rotated on the carriage 60,
In addition, the upper electrode wheel 61 is provided so as to be able to move up and down by the electrode pressing cylinder 63, and is separated from the electrode wheels 61 and 62 in a direction orthogonal to the sheet conveying direction, and a shearing machine (not shown) is provided.

The delivery side clamp device 44 is provided with a delivery side upper clamp 65 and a delivery side lower clamp 66, and the delivery side upper clamp 65 can be moved up and down by the operation of a delivery side clamping hydraulic cylinder 67.

The planish roll device 45 is provided with an upper planish roll 71 extending in a direction orthogonal to the direction in which the steel plate is conveyed above the conveying path for the steel plate, and is conveyed from the upper planish roll 71. The upper planish backup rolls 72 and 73 are provided to be slightly spaced from each other on the upstream side and the downstream side in the direction, and also extend in the direction orthogonal to the transport direction. Similarly, a lower planish roll 74 extending in a direction orthogonal to the sheet steel conveying direction is provided on the lower side of the sheet steel conveying path, and the lower planish roll 74 is provided on the upstream side in the conveying direction and Lower planish backup rolls 75 and 76 are provided on the downstream side so as to be slightly spaced apart from each other and extend in a direction orthogonal to the transport direction.

The upper planish roll 71 and the upper planish backup rolls 72 and 73 are rotatably supported on the upper planish mounting frame 77 via bearings, respectively. This top planish mounting frame 7
7 is a main body frame 78 fixed to the base frame 56.
The upper planish mounting frame 77 is lowered by the operation of the two upper planish pressing cylinders 79, and the upper planish roll 71 is pressed against the upper surface of the steel plate. Further, a motor 80 is provided on the upper polish attachment frame 77, and its rotational force is transmitted through the belt 81, the gear 82, the coupling 83 and a gear mechanism (not shown) to the upper polish roll 7
1 is transmitted to drive the rotation.

Similarly, the lower planish roll 74 and the lower planish backup rolls 75 and 76 are rotatably supported by the lower planish mounting frame 85 via bearings, respectively. This lower planish mounting frame 85 is provided on the main body frame 78 so as to be able to move up and down, and is raised and lowered by two lower planish positioning worm mechanisms 86 to adjust the position of the lower planish roll 74 with respect to the lower surface of the steel plate. To In addition, a motor 87 is provided on the lower planish mounting frame 85,
The rotational force is applied to the belt 88, gear 89, coupling 90.
Also, it is configured to be transmitted to the lower planish roll 74 via a gear mechanism (not shown) so as to be rotationally driven.

The operation of this embodiment will be described below. For example, when a lower pass steel plate (not shown) is being threaded, the lower pass steel plate passes through the lower pass entrance side deflector roll 48 and the lower path entrance side guide 50 and then enters the entrance side clamp device 42. It is conveyed between the center clamp 52 and the entry side lower clamp 53, and further passes through the welded portion 43 and the polish roll device 45 and is conveyed.
Further, the upper pass steel plate (not shown) is a steel plate guide device 41.
It is conveyed between the entrance side upper clamp 51 and the entrance side center clamp 52 of the entrance side clamp device 42 via the upper path entrance side deflector roll 47 and the upper path entrance side guide 49.

Here, in the case of switching the passage of the steel plate from the lower pass steel plate to the upper pass steel plate, first, prior to the switching, the lower polish positioning worm mechanism 86 in the polish roll device 45 is not shown. The lower planish mounting frame 85 is raised by being drive-controlled by the control device, whereby the lower planish roll 74 is set to the lower surface position of the steel plate. In that state, an operation similar to that of the known mash seam welder described in FIGS. 2 to 5 is performed in the inlet side clamp device 42, the welding portion 43, and the outlet side clamp device 44, and the upper pass steel plate and the lower pass Overlap welding with a steel plate is performed.

After that, when the welded portion of the steel sheet by welding is conveyed to immediately before the planish roll device 45, the upper and lower polish rolls 7 of the planish roll device 45 are conveyed.
1, 74 are rotated by the corresponding motors 80, 87, the upper planish pressing cylinder 79 is operated, and the reduction of the steel plate by the upper planch roll 71 is started. As a result, the welded portion of the steel sheet is rolled in the conveying direction of the steel sheet between the upper and lower planish rolls 71 and 74.

[0027]

As described above, in the lap welding machine according to the present invention, the planish rolls are arranged so as to extend in a direction substantially orthogonal to the conveying direction of the steel sheet, and the welded portion of the steel sheet is Since it was rolled in the transport direction,
The welded portion can be uniformly rolled over the entire length without causing buckling or so-called worms during rolling. Therefore, the pressing pressure of the planish roll can be easily set, and the welded portion can be reliably rolled to a desired thickness, for example, 130 to 150% of the steel plate thickness.

[Brief description of drawings]

FIG. 1 is a diagram showing a layout of equipment on the entry side of a continuous steel plate production line.

FIG. 2 is a diagram for explaining the operation of a conventional mash seam welder.

FIG. 3 is also a diagram for explaining the operation of the conventional mash seam welding machine.

FIG. 4 is also a diagram for explaining the operation of the conventional mash seam welding machine.

FIG. 5 is also a diagram for explaining the operation of the conventional mash seam welding machine.

FIG. 6 is a diagram showing a welded portion of a steel sheet that has been lap-welded.

FIG. 7 is a diagram for explaining a rolling operation in a conventional mash seam welding machine.

FIG. 8 is a diagram for explaining a conventional problem.

FIG. 9 is a front view showing an embodiment of the lap welding machine according to the present invention.

FIG. 10 is a right side view showing an embodiment of the lap welding machine according to the present invention.

[Explanation of symbols]

 41 Steel Plate Guide Device 42 Entry Side Clamp Device 43 Welding Part 44 Ejection Side Clamp Device 45 Planish Roll Device 47 Upper Pass Entry Side Deflector Roll 48 Lower Pass Entry Side Deflector Roll 49 Upper Pass Entry Side Guide 50 Lower Pass Entry Side Guide 51 Included Upper side clamp 52 Inlet side center clamp 53 Inlet side lower clamp 54 Inlet side clamp actuating hydraulic cylinder 55 Center clamp actuating air cylinder 56 Base frame 57 Cross adjust device 58 Index device 60 Carriage 61 Upper electrode wheel 62 Lower electrode wheel 63 Electrode pressure lower cylinder 65 Outer side upper clamp 66 Outer side lower clamp 67 Outer side clamp actuating hydraulic cylinder 71 Upper planish roll 72,73 Upper planish backup roll 74 Lower planish roll 75,76 Lower Planish backup roll 77 Upper planish mounting frame 78 Body frame 79 Upper planish pressing cylinder 80,87 Motor 85 Lower planish mounting frame 86 Lower planish positioning worm mechanism

Claims (1)

[Claims] 1. A welded portion which is arranged in a process line for continuously producing steel sheets and which welds the trailing end portion of a leading plate and the leading end portion of a trailing plate in an overlapping manner and welded to each other. In a lap welding machine having a planish roll for rolling a welded part of a steel plate, the planish roll is arranged to extend in a direction substantially orthogonal to the conveying direction of the steel plate, and the welded part of the steel plate A lap welding machine characterized by being configured to roll in the conveying direction.