JP2000061651A - Electrode repair device for seam welding machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technology capable of machining an electrode roll at a superior out-of-roundness despite hard welding spatters. SOLUTION: The pressurizing means of a revolving grindstone 31 is constituted of a pipe line 40 for supplying a compressible fluid, receiver tanks 70, 70 which collects a non-compressible fluid on the bottom side of the container and which collects the compressible fluid supplied by the pipe line 40 on the ceiling side, and a pipe line 60 for guiding the non-compressible fluid from these receiver tanks 70, 70 to a cylinder unit 35. Since the non-compressible fluid is used as the actuating medium of the cylinder unit, preventing the piston from moving easily, even if a grinding tool comes into contact with hard welding spatters for example, the grinding tool is no longer pushed back. As a result, an electrode roll can be suitably repaired.

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrode repairing apparatus for a seam welding machine. 2. Description of the Related Art FIG. 7 is a diagram showing the principle of a seam welding machine.
02, the electrode rolls 101, 101 are rotated while being pressed by the electrode rolls 101, 101, and the transformer 103
When a welding current flows between the electrode rolls 101, 101,
Large Joule heat is generated due to the resistance between the workpieces 102, 102, and a part of the workpieces 102, 102 melts to form a nugget 105, so that the workpieces 102, 102 can be joined to each other. [0003] Because of welding, welding spatter (slag) may adhere to the electrode rolls 101, 101. Further, the electrode rolls 101, 1 are brought into contact with the workpieces 102, 102 by contact.
01 is scratched. When these are left, the electrode roll 10
The irregularities become conspicuous on the outer peripheral surfaces of the workpieces 1 and 101, and troubles such as damaging the workpieces 102 and 102 occur. Therefore, it is necessary to appropriately grind the outer peripheral surfaces of the electrode rolls 101, 101 with a grinding tool to make them flat. This operation will be referred to as electrode repair. [0004] As an electrode repairing device for this purpose, for example, Japanese Patent Application Laid-Open No. Sho 53-60844 has proposed an "electrode roller shaping device". In this case, the blade support arm 2 'for supporting the blade 3' is supported by the parallel links 10 and 11, while the blade support arm 2 'is supported by the coil spring 4'. Extrusion. Since the parallel links 10 and 11 are used, the cutting tool 3 '
Is characterized by the fact that good grinding can be maintained because the angle does not change. [0005] By the way, among the objects to be removed, weld spatter is solidified molten metal,
Generally hard. In the above device, the blade 3 'is pushed back by hard welding spatter, and as a result, the electrode roller 5 may become non-circular. This is because the coil spring 4 'contracts easily. Therefore, there is a need for a technique capable of processing the electrode roll into a good roundness even when hard welding spatter exists. [0006] The pressing of the above device is performed by the coil spring 4 '.
It is necessary to manually adjust the adjustment nut 22 for adjusting the length of the arm. Adjustment around the welding machine requires measures for work safety, and furthermore, production must be stopped during work, so productivity is reduced. Therefore, there is a need for a repair device that does not require the operator to be close to the welding machine and that does not need to interrupt the work. [0007] In order to meet the above demand, a first aspect of the present invention is a device for repairing an electrode roll by pressing a grinding tool against an electrode roll of a seam welding machine. The pressing means includes a compressible fluid line that supplies a compressible fluid, a receiver tank that stores the incompressible fluid at the bottom side of the container and stores the compressible fluid supplied by the compressible fluid line at the ceiling side of the container. And a cylinder unit for extruding a grinding tool with the incompressible fluid supplied through the incompressible fluid line as a working medium. Features. Since the working medium of the cylinder unit is incompressible fluid so that the piston does not easily move, even if the grinding tool comes into contact with hard welding spatter or the like, the grinding tool will not be pushed back. Therefore, the electrode roll can be preferably repaired. In terms of equipment, an expensive incompressible fluid line can be kept near the cylinder unit and the rest can be configured with an inexpensive compressible fluid line,
Equipment costs can be reduced. Since the valves interposed in the pipe can be remotely operated, work safety can be enhanced, and the electrode roll can be repaired during welding, which is convenient. Embodiments of the present invention will be described below with reference to the accompanying drawings. The drawings should be viewed in the direction of reference numerals. FIG. 1 is a principle view of a seam welding machine according to the present invention. A seam welding machine 10 includes a lower electrode roll 14 and a lower swaging roll 15 rotatably mounted on a base 11 via brackets 12 and 13, Upper electrode roll 24 and upper swaging roll 25 rotatably mounted on frame 21 via brackets 22, 23.
And electrode repair devices 30, 30 arranged along the respective electrode rolls 14, 24. Since the lower electrode repair device 30 is the same as the upper electrode repair device 30 except that the upper electrode repair device 30 is turned upside down, only the upper electrode repair device 30 will be described below. The swaging rolls 15, 25 are members that guide or press the workpieces 17, 27, and are members that can be vertically adjusted although omitted in the drawing. The upper electrode repairing device 30 basically includes a rotating grindstone 31 as a grinding tool and the rotating grindstone 31
4 and a pressing means 32. The pressing means 32 further comprises a mechanism shown in FIG. 1 and a control system shown in FIG. In FIG. 1, the mechanism of the pressing means 32 includes a bracket 33, a triangular link plate 34 rotatably attached to the bracket 33, a cylinder unit 35 for pushing and pulling the link plate 34, and a cylinder unit 35. A pin 36 rotatably supported by the lifting frame 21. FIG. 2 is a piping diagram of the control system of the pressing means according to the present invention. The control system of the pressing means 32 supplies a compressive fluid composed of air or an inert gas (for example, nitrogen gas). A compressible fluid line 40; receiver tanks 70, 70 for storing an incompressible fluid at the bottom side of the container and storing the compressible fluid supplied by the compressible fluid line 40 at the ceiling side of the container; The incompressible fluid composed of oil or water is supplied from the tanks 70 and 70 to the cylinder unit 3.
5 leading to an incompressible fluid line 60. Specifically, the compressible fluid line 40 includes a fluid supply source 41, a stop valve 42, a first pressure reducing valve 43, a direction switching valve 44, second pressure reducing valves 45A and 45B, and pipes 46 and 47A. 47B
Consists of The structure of the receiver tank 70 will be described later. The incompressible fluid pipeline 60 is composed of flow control valves 61A and 61B and pipes 62A and 62B. The cylinder unit 35 includes a cylinder 35a, a piston 35b, and a piston rod 35c.
a is divided into a first chamber 37 and a second chamber 38,
The pipe 62A is connected to the second chamber 38, and the pipe 62A is connected to the second chamber 38.
B is connected. FIG. 3 is a sectional view taken along the line 3-3 in FIG. 1. The electrode roll 24 has a shaft 65 for supporting the electrode roll 24 directly or indirectly via a drive system such as a reduction gear or a gear set. The rotation is made by one rotation means 66. The rotating grindstone 31 is, for example, a flanged roller, and the shaft 67 supporting the wheel is directly or indirectly rotated by a second rotating means 68 such as an electric motor via a drive system such as a reduction gear or a gear set. Yes, grinding is performed by providing a peripheral speed difference between the electrode roll 24 and the rotary grindstone 31. In addition, 69
-(... indicates a plurality, the same applies hereinafter) is a bearing. FIG. 4 is a sectional view of a receiver tank according to the present invention. The receiver tank 70 has a bottom 71, a body 72, a flange 73, a blind flange 74, a packing 75, and a bolt / bolt.
A closed container consisting of nuts 76 is provided with legs 77, a viewing window 78, an upper level gauge 79, a lower level gauge 81, a compressible fluid port 82, and a non-compressible fluid port 83. 84 is a drain pipe, 85 is a drain valve. Explaining the operation of the receiver tank 70, the receiver tank 70 is a container that also serves as a so-called gas-liquid separator,
An incompressible fluid 87 such as heavy oil or water is stored in the lower half of the container, and a compressible fluid 86 such as light air is stored in the upper half. The total effective height is H1, and the upper level from the bottom is 7 in total.
H2 = 0.80 × H1, H3 = H2 where H2 is the height up to 9 and H3 is the height from the bottom to the lower level total 81.
It is desirable to be 0.20 × H1. That is, the incompressible fluid 8 in order to avoid the entire inside of the receiver tank 70 becoming only the compressible fluid 86 or only the incompressible fluid 87.
7 is kept at 20% to 80% of H1. The upper level meter 79 and the lower level meter 81 are monitoring sensors for that purpose. When the incompressible fluid 87 is contaminated or deteriorated due to long-term use, the drain valve 85 can be opened and discharged from the container at any time by opening the drain valve 85. The operation of the electrode repair device and the pressing means described above will now be described. FIGS. 5A to 5C are explanatory diagrams of the operation of the pressing means according to the present invention. 2A shows an embodiment and is a schematic view of FIG. 2, in which the range from the cylinder unit 35 to the receiver tanks 70, 70 is "incompressible fluid", and the range from the receiver tanks 70, 70 to the fluid supply source 41 is "compressible". Fluid "range. (B) shows Comparative Example I in which only the working medium is “compressible fluid”. That is,
The cylinder unit 35 is moved back and forth with a compressible fluid. (C) shows Comparative Example II in which the working medium is only “incompressible fluid”. That is, the cylinder unit 35 is moved forward and backward with the incompressible fluid. (A) ~
Regardless of (c), the cylinder unit 35 can be operated. In addition, compared to (a),
(B) and (c) do not require the receiver tanks 70,70. FIGS. 6A and 6B are comparative explanatory diagrams of the pressing means. (A) is an enlarged view of a main part of “(b) Comparative Example I of FIG. 5”, and compressible fluids 86 and 86 are present in the first and second chambers 37 and 38 of the cylinder unit 35.
The pressure on the first chamber 37 side is high, and 0.5-
It is assumed that a differential pressure of about 3 kg / cm ² is acting. On the other hand, hard welding spatter 89 is attached to the electrode roll 24, and it is necessary to remove this with the rotating grindstone 31. By turning the electrode roll 24, welding spatter 89 is applied to the rotating grindstone 31, but the rotating grindstone 31 indicated by the imaginary line moves to the position indicated by the solid line for the following reason. This is because the compressible fluid 86 in the first chamber 37 contracts and the piston 35b rises by δ. In this case, the electrode roll 24 cannot be ground to a perfect circle. FIG. 5B is an enlarged view of the main part of “Example of FIG. 5A” and “Comparative Example II of FIG. 5C”.
Incompressible fluids 87, 87 are present in the first and second chambers 37, 38 of the cylinder unit 35. It is assumed that the pressure on the first chamber 37 side is high and a differential pressure of about 0.5 to 3 kg / cm ² is acting on the piston 35b. On the other hand, hard welding spatter 89 is attached to the electrode roll 24, and it is necessary to remove this with the rotating grindstone 31. When the welding spatter 89 is applied to the rotating grindstone 31 by rotating the electrode roll 24, the piston 35 b is pushed up via the link plate 34. However, in the first chamber 37, there is an incompressible fluid 87 which hardly contracts, and in this state, the piston 3
When trying to raise 5b, the incompressible fluid 87 tends to flow out through the pipe 62A and the flow control valve 61A. However, the pipe 62A has a very small diameter with respect to the inner diameter of the cylinder 35a, has a large flow path resistance, and cannot have a large flow velocity. In addition, the flow control valve 61A is a kind of throttle, and has a smaller diameter and a larger resistance than the pipe 62A. As a result, the piston 35b does not immediately rise, so that the rotating grindstone 31 is strongly pressed against the welding spatter 89,
The welding spatter 89 is forcibly ground. The electrode roll 24 in the portion where the welding spatter 89 is not attached is ground by the rotary grindstone 31 with a force of about 0.5 to ³ kg / cm ^2, so that there is no concern about excessive grinding.
That is, in (b), only the portion of the welding spatter 89 is ground with an extremely large pressure, and the other portion is ground with a low pressure, so that repair with high roundness can be performed. Returning to FIG. 5, (b) is not suitable for the electrode repair device 30 because repair with high roundness cannot be performed, and it can be said that (c) and (a) are appropriate. But,
(C) is a pipe 46, 47A, 47B in which an incompressible fluid such as oil is sealed in all of the pipes 46, 47A, 47B.
The airtightness must be increased so that the incompressible fluid does not leak, and the operating pressure in the cylinder unit 35 is 0.5
Despite the low pressure of about 3 kg / cm ² ,
A hydraulic piping specification of up to 200 kg / cm ² must be used, which increases the equipment cost. In this regard, (a) shows pipes 46, 47A, 47
Since a compressive fluid such as air flows through B, this portion can be made inexpensive pneumatic piping specifications, and the overall device cost can be reduced. The required amount of the incompressible fluid such as oil is also very small in (a) compared to (c), and (a) is advantageous also in terms of the cost of replacing oil and the like. That is, by making the range of the non-compressible fluid in FIG. 5A very small and making the range of the compressible fluid large, both the initial cost and the running cost are lower than in FIG. 5C. Can be suppressed. Furthermore, FIG.
As is clear from FIG. 7, the pressing force of the rotary grindstone 31 can be easily adjusted by changing the setting of the second pressure reducing valves 45A and 45B. The adjustment work can be performed in the cab remote from the welding site, which is preferable in terms of work safety. Alternatively, even when the second pressure reducing valves 45A and 45B are inexpensive manually adjusted pressure reducing valves, the second pressure reducing valves 45A and 45B are sufficiently provided from the welding site because they are provided in a sufficiently long compressible fluid range. It can be placed in a distant place, which also increases safety. The electrode repair apparatus 30 of the present invention is operated during the waiting time after seam welding in principle, but may be operated during seam welding. An incompressible fluid is preferable because water or oil used in a hydraulic system is easily available and inexpensive. However, since most liquids have non-compressive performance and can be replaced, they are not particularly limited to types. Further, a compressible fluid is suitable because an inert gas such as air or nitrogen gas is easily available and inexpensive, and an inert gas is more preferable because it does not deteriorate an incompressible fluid. However, most gases have compressive performance and can be replaced, and are not particularly limited to types. According to the present invention, the following effects can be obtained by the above-mentioned structure. In the first aspect, the working medium of the cylinder unit is made to be an incompressible fluid so that the piston does not easily move. Therefore, even if the grinding tool comes into contact with hard welding spatter or the like, the grinding tool is not pushed back. Therefore, the electrode roll can be preferably repaired. In terms of equipment, an expensive incompressible fluid line is fastened near the cylinder unit,
Since the remainder can be constituted by an inexpensive compressible fluid line, the cost of the apparatus can be reduced. Since the valves interposed in the pipe can be remotely operated, work safety can be enhanced, and the electrode roll can be repaired during welding, which is convenient.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a principle diagram of a seam welding machine according to the present invention. FIG. 2 is a piping diagram of a control system portion of a pressing means according to the present invention. FIG. 3 is a line 3-3 in FIG. FIG. 4 is a cross-sectional view of the receiver tank according to the present invention. FIG. 5 is an explanatory view of the operation of the pressing means according to the present invention. FIG. 6 is a comparative explanatory view of the pressing means. EXPLANATION OF SYMBOLS 10 ... Seam welding machine, 14, 24 ... Electrode roll, 17,
27 ... welded part, 30 ... electrode repair device, 31 ... grinding tool (rotary grindstone), 32 ... pressing means, 35 ... cylinder unit, 40 ... compressible fluid pipeline, 60 ... incompressible fluid pipeline,
Reference numeral 70: Receiver tank, 71: Container bottom, 74: Container ceiling (blind flange), 82: Compressible fluid port of the receiver tank, 83: Incompressible fluid port of the receiver tank, 86: Compressible fluid, 87 ... Incompressible fluid, 89 ... welding spatter.

Claims (1)

Claims: 1. An apparatus for repairing an electrode roll by pressing a grinding tool against an electrode roll of a seam welding machine, wherein the pressing means for pushing the grinding tool includes a compression means for supplying a compressible fluid. A compressible fluid line, a receiver tank for storing an incompressible fluid on the bottom side of the container and storing the compressible fluid supplied by the compressible fluid line on the ceiling side of the container, and an incompressible fluid from the receiver tank. An electrode repair for a seam welding machine, comprising: an incompressible fluid pipe to be led out; and a cylinder unit for extruding the grinding tool using the incompressible fluid supplied through the incompressible fluid pipe as a working medium. apparatus.