JP3073038U - Ultra-thin butt welding equipment - Google Patents

Abstract

(57) Abstract: A welding apparatus for providing a flat welded portion by accurately butting both ends of a thin steel plate having a thickness of 0.5 mm or less and providing a flat welded portion. In a welding device for performing gas welding by butt-joining both end surfaces, both ends of a leading plate and a trailing plate are stopped at positions where they do not collide in a shearing machine having two blades each at the top and bottom, and the leading plate and the trailing plate are stopped. Was held in each clamp device, and after the both ends were trimmed at the same time by a shearing device, the shearing device was retracted, and then the clamping device was moved to move the succeeding plate clamp to abut the succeeding plate against the preceding plate. A pair of auxiliary clamp rolls for correcting the pressing shape of both end faces are provided immediately before the welding device with a backup torch on the back side and a welding torch on the front side that moves along the welding line. One to press Welding for ultra-thin plate butt process line, characterized in that a flat welding part is obtained by incorporating a moving device constructed by arranging flat rolls in a common frame and pressing on a moving rail and moving by gas welding apparatus.

Description

[Detailed description of the invention] [Technical field to which the invention belongs]

 The present invention relates to a welding machine for a process line for welding ultra-thin steel sheets of 0.5 mm or less by butt welding.

[Prior art]

 In a welding machine for a thin steel sheet process line of 0.5 mm or less, both ends of the preceding plate and the succeeding plate are overlapped, and a pair of electrode wheels are arranged above and below the steel plate to carry out pressurized running to perform AC or DC current. Through the electrode wheel for resistance welding. Such a step in the thickness of the overlapped and welded steel sheet causes flaws in the rolling rolls and the transporting rolls, thus increasing the frequency of roll replacement. In addition, when the welded joint is wound up, the step mark is transferred to the steel plate, so the welded part cannot be wound up and cut at the welded joint, making it impossible to increase the coil diameter. I'm making it. Further, the step portion causes defects such as rust after the surface coating. In addition, there is a problem of quality and yield, such as the part before and after the stepped portion is cut off as a defective product. The amount of superposition is adjusted in the range of about 1 to 3 mm, but the adjusting device requires a complicated mechanism together with the superposing device. Further, the electrode wheel has a facility problem such as frequent maintenance due to dents at the steps due to the soft material of the copper alloy.

[Problems to be solved by the invention]

 As a method of solving these drawbacks, a flat welded material without steps can be obtained by butt welding thin steel plates, but a laser welding machine or flash butt is used for welding thick plates. It is used by welding machines and the like, but is not particularly adapted to a thin plate thickness of 0.5 mm or less. Plasma welding machines or TIG welding machines are commercially available as welding machines that butt and weld thin steel plates. However, when used in a process line, a thin plate with a thickness of 0.5 mm or less and a plate width of 500 mm or more can be used in a short time. It is difficult to accurately match materials with bad shapes, and it is not possible to make a uniform weld bead because the gas is released from the small gap between the butted portions during welding. In the present invention, an ultra-thin process line is provided by providing a device that accurately butts a thin plate in a short time, a device that obtains a uniform weld bead, and a device that flattens the shape after welding. An object of the present invention is to provide a butt welding apparatus for steel sheets.

[Means for Solving the Problems]

 The present invention has the following configuration to achieve the above object. As a device to accurately match thin plate thicknesses in a short time, the shearing surfaces of the clamping device and the shearing device that hold both ends of the leading plate and the trailing plate have the same height accuracy, and the ends of the leading plate and the trailing plate have the same height accuracy. Both ends are stopped at a position where they do not collide in a shearing machine having two blades each at the top and bottom, the leading plate and the following plate are held by respective clamping devices, and both ends are trimmed at the same time by the shearing machine. Open. Next, the trailing plate clamp device was used as a clamp device in which the shear width of the shearing machine was moved on the LM guide rail to bring the trailing plate into contact with the leading plate end. A gas welding torch that moves along the weld line butted as a device to obtain a uniform weld bead, and a backup roll arranged on the back of the plate in combination with the gas welding torch. Welding equipment to prevent flapping. In addition, a pair of auxiliary clamp rolls that press the welding line butted immediately before the torch are provided, and the plate is sandwiched between the two ends with different shapes. As a device for flattening the shape after welding, a pair of Polish roll devices that press the welding line immediately after the torch were provided. These devices are installed in a common frame and press on the LM guide rail to move by gas welding.

[Embodiment of the invention]

 As a device to accurately match thin plate thicknesses in a short time of the present invention, the clamping device that holds both ends of the leading plate and the trailing plate and the shearing surface of the shearing machine have the same height accuracy. In order to stop both ends at positions where they do not collide with the shears, the distance between the two blades of the shears was adjusted to the precision of stopping the feeding of the steel sheet. In addition, LM guide rails were used for the moving rails that hold the trailing plate and abut against the leading plate edge, and the mechanical accuracy during movement was increased to facilitate the abutment of both ends. A device for obtaining a uniform weld bead requires accurate butting at both ends. For ultra-thin steel sheets of 0.5 mm or less, the shape of both ends after shearing is affected by the gap between the upper and lower blades of the shearing machine, and the shape of each plate is different, so that the accuracy of abutment cannot be obtained. A pair of auxiliary clamp rolls are arranged between the two clamps, and the welding torch moves immediately after pressing the welding joint lines at the butted ends, so it is not affected by the shape of the shearing machine or the plate Welding can be performed in accurate butting. In addition, in gas welding, a backup roll is provided on the back of the plate in combination with the gas welding torch to prevent gas from leaking from a slight gap between the butted welding lines and to prevent vibration of the plate at the welding line due to gas pressure. The welding equipment was installed. As a device for flattening the shape after welding, the welding torch is affected by accurate butting.However, by installing a pair of Polish roll devices that press and move the welding line immediately after the welding torch, By arranging the rolls at the bottom, immediately before, and immediately after, welding by accurate butt was enabled, and the weld bead was flattened to make the butt-welded plate more flat. These pressing and gas welding devices are incorporated in a common U-shaped frame and are devices for welding and moving in the direction of a welding line where both ends are abutted on an LM guide rail with suppressed height accuracy and runout accuracy.

【Example】

An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is an overall side view of the welding device of the present invention as viewed from the center BB. FIG. 2 is a front view of the welding device of the present invention as viewed from the line AA. FIG. 3 is a welding device of the present invention. FIG. 2 is a front view of the welding device of the present invention. The moving part main body frame 1 is composed of a shearing device having both upper blades 6 and lower blades 7 with a steel plate 20 sandwiched inside a U-shaped frame, a welding device having a welding torch 37, and the like. The welding device travels in the direction indicated by the arrow 5 to the movement limit position 19 while welding on the upper lower rail 16. FIG. 7 is a process flowchart showing the operation of the welding device of the present invention. The operation sequence of the welding device of the present invention will be described with reference to the process flowchart of FIG. Step (1) shows a state immediately before the stop of the process line. The steel plate 20 is being supported by the rolls 43 in the direction of the arrow 21 under tension and is proceeding. The upper blade 6 and the concave lower blade 7 of the shearing machine having the both blades of the moving part main body frame 1, the input side clamp 22 and the output side clamp 25 are in standby state with the steel plate 20 interposed therebetween. The entrance clamp 22 supported by the frame 24 of the entrance fixing section 2, the exit clamp 25 supported by the frame 27 moving on the moving rail 29 of the exit fixing section 3, and the guide rod 11 of the shearing machine. The height level 31 of the shear surface of the concave lower blade 7 raised by the lower blade lifting cylinder 10 has the same height accuracy. When the tension of the steel plate 20 is obtained, the pass line of the steel plate 20 is higher than the level 31 so as not to contact the equipment surface. In step (2), the tail end 32 of the preceding plate 20 'is stopped within the range of the concave lower blade 7, and the clamp cylinder 23 of the entrance clamp 22 is lowered and held. Next, the trailing plate 20 "is passed through, the tip 33 is stopped within the range of the concave lower blade 7, and the cylinder 26 of the output side clamp 25 is lowered to hold the trailing plate 20". Although the clamp cylinders 23 and 26 are of the pneumatic type, they may be of the hydraulic type. Since the automatic stop accuracy of the plate is about ± 30 mm, the inner width of the concave lower blade 7 is set to 100 mm. In the case of manual feeding, it can be stopped visually from the front. Since the level 31 of each of the clamps 22 and 25 and the concave lower blade 7 has an accuracy of the same height level 31 within 1/100 mm, a plate thickness of 0.1 mm can be abutted. In the step (3), the cylinder 8 of the upper blade 6 having the guide rod 9 of the shearing machine is operated and lowered, and both ends are cut and trimmed at the same time. The tail scrap 32 ′ and the tip scrap 33 ′ fall into the concave lower blade 7 and are removed manually or by a magnetic device if it is a magnetic plate. In the step (4), the cylinder 8 of the upper blade 6 of the shearing machine is moved up while the cylinder 10 of the concave lower blade 7 is lowered. Next, the output side clamp 25 of the trailing plate 20 ″ is moved by the moving cylinder 30 on the steady rest LM guide rail 29 on the fixed base 28 on the stationary base 28, and the shearing machine width of 100 mm is moved by the shearing machine. The shape of the butting portions 34 at both ends of the butting plate 20 'is such that the gap between the upper blade 6 and the lower blade 7 of the shearing machine can be combined with an accuracy of within 1/100 mm. Also, the cutting state changes. Both ends of the leading plate 20 'and the trailing plate 20 "are particularly bad in shape and cannot be accurately fitted. Furthermore, when the supporting distance from the tip of both clamps 22 and 25 to the butting portion 34 is long, it is not possible to particularly match, so in order to shorten the length, only the thickness of the lower blade 7 is set to 7 mm. However, it was impossible to accurately adjust the thickness of 0.1 mm. FIG. 4 is a diagram showing the welding configuration of the welding device of the present invention. The welding device of the present invention is a commercially available Micro. The pulse plasma welding machine PW-20FR was used. Argon and hydrogen mixed gas 40 Cooling water 39 Power supply body 36 to which power supply 35 is supplied is provided separately, and welding torch 37 is assembled by flexible cable 38 into moving part body frame 1 by plasma arc. And The welding apparatus according to the present invention is constructed by disposing a welding torch 37 supported by a lifting cylinder 42 at the center, a backup roll 41 paired with the plate 20 interposed therebetween, and a pair of rolls 12 and 14 before and after the backup roll 41. It is characterized by doing. In the step (5), the butting portion 34 cannot be accurately adjusted due to the influence of the shape of the shearing machine, the front and rear ends of the plate, the distance between the clamps, and the like. A pair of auxiliary clamp rolls 12 are arranged so as to interpose and are pressed and moved by the cylinder 13. The auxiliary clamp roll 12 was a roll having an outer diameter of 70 mm and a roll width of 12 mm so as to cover the gap between the inlet and outlet clamps 20, 25, and the inner diameter of the pneumatic cylinder 13 was 80 mm. The auxiliary clamp roll 12 is not driven, but can be driven. The shape of the butted portion 34 immediately before the welding torch 37 is corrected by the above-mentioned auxiliary clamp roll 12 because the burr on the end face generated by the shearing machine and the shape of the front and rear ends of the steel plate 20 are corrected. Accurate butting can be achieved even with a plate thickness of 1 mm. Step (6) shows the welded portion of the present invention. It is characterized in that a backup roll 41 is provided on the lower side with the welding torch 37 and the steel plate 20 interposed therebetween and the pair is moved by welding. The distance between the tip of the welding torch 37 disposed so as to match the butt 34 and the steel plate 20 is 1 mm by an adjustable device, and the backup roll 41 is a roll having an outer diameter of 70 mm and a roll width of 12 mm on the inlet / outlet side. The clamps 20 and 25 are arranged so as to cover the gap, and are in contact with the back surface of the steel plate 20. The backup roll 41 is not driven, but can be driven. The backup roll 41 not only keeps the surface of the steel plate 20 of the butted portion 34 constant, but also has the function of preventing the end face of the plate from flapping due to the welding gas pressure and preventing gas from leaking out from a slight gap. Welding can be performed evenly with a plate thickness of 0.1 mm. FIG. 5 is a front view for explaining a welded portion using the fixed auxiliary clamp according to the present invention. FIG. 6 is a front view of a welded portion using the movable auxiliary clamp according to the present invention. The welded portion according to the embodiment uses the movable auxiliary clamp roll 12, but as shown in FIG. It is also possible to use the entrance and exit auxiliary clamp plates 12 ', 12 "and the backup plate 41' to open and close in the directions indicated by arrows 44 and 45. In this case, the entrance and exit auxiliary clamps can be used. The distance between the tips of the plates 12 ′ and 12 ″ is a fixed auxiliary clamp that does not move together with the welding torch 37, which has a minimum spacing of 2 mm necessary for welding in order to make the butted portion 34 of the steel plate 20 accurate. You can also. In the step (7), a pair of the fin rolls 14 is arranged so as to sandwich the butt portion 34 immediately after welding by the welding torch 37 and to be moved by the cylinder 15. The planish roll 14 is a roll having an outer diameter of 70 mm and a roll width of 7 mm, and the pressing cylinder 15 is a pneumatic cylinder having an inner diameter of 100 mm to press and move the welding line of the butt 34. The pressing force is adjustable by a pressure control valve. Although a pneumatic cylinder is used, a hydraulic cylinder may be used. Further, the polisher roll 14 is not driven, but can be driven. In the step (8), the inlet / outlet clamps 22 and 25 are opened after the moving unit main body frame 1 is moved in the direction of the butting portion 34 by welding, and the outlet clamp 25 returns to the original position. The above device is incorporated in the U-shaped moving unit main body frame 1 and the LM guide rail 16 on the lower surface of the base 4 and the side LM guide rails 17 installed on the side surfaces of the entrance and exit side fixing parts 2 and 3 are prevented from swinging and hydraulic traveling. The apparatus was moved by a cylinder 18 in the directions indicated by arrows 5. The moving device may be of a screw type or the like. In the example in which a cold rolled tin-plated plate having a plating thickness of 2.8 g / m ^{2 having} a thickness of 0.17 mm and a width of 1000 mm was welded using the above apparatus, the welding current was 9.5 A and the welding movement speed was 1000 mm / min. The welding current at the start and end portions at both ends was 4.5 A, and almost 1/2 current control was performed, so that uniform and clean flat welding could be obtained.

[Effect of the invention]

 In addition to enabling the butt welding of ultra-thin steel plates without any step, the device of the present invention required a lapping mechanism and a mechanism for adjusting the amount of lapping in the overlap welding device. Can be provided. In addition, the work efficiency was improved without the necessity of the grinding work for the electrode wheel. Furthermore, in the embodiment of the present invention, flat plate welding has been described, but by forming the auxiliary clamp roll into a roll shape having a curvature corresponding to the inner and outer diameters of the can, butt welding without step even in can welding cans. Can be made possible.

[Brief description of the drawings]

FIG. 1 is an overall side view of the welding device of the present invention as viewed from the center BB.

FIG. 2 is a cross-sectional view of the welding device of the present invention as viewed from the center AA.

FIG. 3 is a front view of the welding device of the present invention.

FIG. 4 is a welding configuration diagram of the welding device of the present invention.

FIG. 5 is a front view for explaining a welded portion using the fixed auxiliary clamp according to the present invention;

FIG. 6 is a front view of a weld using the movable auxiliary clamp according to the present invention;

FIG. 7 is a process flowchart showing the operation of the welding device of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Moving part main body frame 2 Inlet fixed part 3 Outlet fixed part 4 Base 5 Arrow 6 Upper blade 7 Lower blade 8 Upper blade cylinder 9 Guide rod 10 Lower blade cylinder 11 Guide rod 12 Auxiliary clamp roll 12 'Auxiliary clamp Plate 12 "Out-side auxiliary clamp plate 13 Cylinder 14 Polish roll 15 Cylinder 16 Lower rail 17 Side rail 18 Traveling cylinder 19 Travel limit position 20 Steel plate 20 'Leading plate 20" Trailing plate 21 Arrow 22 Inlet clamp 23 Clamp cylinder 24 Frame 25 Outgoing side clamp 26 Clamp cylinder 27 Frame 28 Moving base 29 Moving rail 30 Moving cylinder 31 Level 32 Tail 32 'Tail scrap 33 Tip 33' Tip scrap 34 Butt 35 Power supply 36 Power supply body 37 Welding torch 3 Cable 39 cooling water 40 mixed gas 41 backup roller 41 'backup plate 42 a cylinder 43 rolls 44 arrow 45 arrow

Claims (1)

[Utility model registration claims] 1. A welding apparatus for welding an ultra-thin steel plate by abutting both end surfaces of a leading plate and a trailing plate, and after stopping both ends of the leading plate and the trailing plate in both blades of a shearing machine having upper and lower blades. Hold with each clamp, shear and trim,
Next, after opening the shears, the clamp of the succeeding plate is moved by the amount of both shearing blades and held by a clamp device that abuts the end of the succeeding plate with the end of the preceding plate, and then the surface that moves along the weld line butted. A pair of auxiliary clamp rolls for correcting the pressing shape of both end faces are provided immediately before the welding device in which a backup roll is provided on the back side of the welding torch and a pair of planish rolls for pressing the weld immediately after. A welding device for an ultra-thin plate butt process line, wherein a moving device configured and arranged is incorporated in a common frame and a flat welding portion is obtained by pressing on a moving rail and moving by gas welding.