KR100270095B1 - Apparatus and method for meshseam welding - Google Patents

Abstract

PURPOSE: A mesh seam welder and a welding method thereof are provided to properly overlap welded portion between a first and a second weld metal according to the thickness of weld metals and to continuously weld the weld metals in a regular direction. CONSTITUTION: A mesh seam welder welds after overlapping the ends of a first and a second weld metal(12,13). The first weld metal is fixed and the welding start point and the welding finish point of the second weld metal are moved by cylinders, vertically to a welding direction. An image measuring sensor(23) is installed in the rear side of a welding disc electrode to sense a welded portion and transmits the welded portion as an image while interlocking with the welding disc electrode. The image measuring sensor converts the image data to an overlapped degree by being coupled with an image processor(24). A comparator(27) compares the output of the image process with the output of an overlapped degree setter(25). Thus, the comparator drives the cylinder for the welding finishing point to regularly keep the overlapped degree.

Description

Mesh seam welding device and method

The present invention relates to a mesh seam welding apparatus and a method for welding each of the ends of the first to-be-welded material and the second to-be-welded material to overlap each other.

Conventionally, in consideration of thermal deformation occurring during welding, the amount of overlap between the start point and the end point of the welding point is set differently, or the length of the clamp and the welding point vary according to the welding thickness (Japanese Patent Laid-Open No. 2-52179). And the like) are disclosed.

1 is a block diagram showing an example of a conventional seam welding device, Figure 2 is a block diagram of the main portion viewed from the side of Figure 1, in the drawing (1) is a frame for supporting the device, (2) is the frame A first clamp device provided on (1), wherein the first clamp device (2) includes a first support portion (2a) fixed on the frame (1) and a first clamp fixed on the first support portion (2a). (3) is the first clamp is provided in the first clamp portion (2b) to move up and down, (4) is installed in the first clamp portion (2b) and the first The first cylinder (5), which allows the clamp (3) to move up and down, is a pin installed in the first clamp device (2), and through the pin (5), the first clamp portion (2b) is a first It is supported by the support part 2a so that rotational movement is possible.

(6) is a second clamp device provided on the frame (1), and the second clamp device (6) has a second support (6a) fixed on the frame (1) and the second support (6a) It consists of the 2nd clamp part 6b supported so that back and forth (left-right direction of FIG. 1) movement is possible. (7) is the second clamp installed so as to move up and down in the second clamp portion (6b), (8) is installed in the second clamp portion (6b) can move the second clamp (7) up and down The second cylinder (9) is provided on the second support (6a) to clamp the cylinder for moving the second clamp portion (6b) in the front and rear direction, (10) and (11) are respectively A stopper at the time of forward movement and a stopper at the time of retreat provided in the second support portion 6a, and the second clamp portion 6b contacts the stopper 10 at the time of advancement and the stopper 11 at the time of retreat, respectively. It is possible to move back and forth within the range that can be done.

(12) and (13) are flat first and second to-be-welded materials fixed by the first and second clamp devices (2) and (6), respectively.

14 is a frame provided on the frame 1 so as to be movable in the width direction (left and right directions in FIG. 2) of the first and second to-be-welded materials 12 and 13, and the frame 14 is cut and An electric power supply device (not shown) for welding is mounted, and 15 and 16 are respectively installed on the frame 14 so as to face each other so that the ends of the first and second to-be-welded materials 12 and 13 are connected. The upper cutter and the lower cutter which cut | disconnect, These upper cutters 15 and the lower cutters 16 are respectively movable up and down by the upper cutter cylinder 15a and the lower cutter cylinder 16a, respectively.

Reference numeral 17 is a disk electrode provided to be rotatable in the frame 14.

In the conventional seam welding device as described above, the first to-be-welded material 12 is first fixed by the first clamping device 2, and the second to-be-welded material 13 by the second clamping device 6. To be fixed. At this time, the second clamp portion 6b is in a retracted state until it comes in contact with the stopper 11 when retreating. Next, the lower cutter 16 is moved upward, and then the upper cutter 15 is moved downward to cut each end of the first and second to-be-welded materials 12 and 13. As a result, the ends of the first and second to-be-welded materials 12 and 13 face each other in parallel. After cutting, the upper cutter 15 moves upward, and the lower cutter 16 moves downward to maintain the initial state.

At this time, since the first clamp portion 2b does not move back and forth, and the second clamp portion 6b has its retracted position regulated by the stopper 11 at the time of retreat, the first and second to-be-welded materials ( 12) The distance (protrusion distance) from the cutting position of 13 to the clamp position is always the same.

Subsequently, the second clamp portion 6b is advanced to contact the stopper 10 by the clamping cylinder 9, and the first clamp portion 2b is rotated to rotate to allow the first weld member 12 to be moved. Lower the end of the lower side slightly. As a result, the ends of the first and second to-be-welded materials 12 and 13 overlap each other, and the first clamp portion 2b returns to its original state.

By moving the frame 14 therein, the disc electrode 17 is moved along the overlapping portions of the first and second to-be-welded materials 12 and 13.

Here, FIG. 6 is a block diagram of the main part showing the state during welding of the seam welding device shown in Japanese Unexamined Patent Application Publication No. 50-21426, whereby the disc electrode 17 is the first and second blood welding. The ends of the ashes 12 and 13 are energized to the welded portions 18 which overlap each other, and are moved while pressing the welded portions 18 in the vertical direction. Thereby, the welding part 18 is welded sequentially.

By the way, when this lap seam welding is performed normally, the thickness of the welding part 18 will be twice the thickness of the plate | plate thickness t, and since this phenomenon is unpreferable, it presses the welding part 18, and it welds as a lump. The thickness of 18 is made to approach the plate thickness t as much as possible.

However, the distance (protrusion length) from the cutting position to the clamp position with respect to the first and second to-be-welded materials 12 and 13 is the plate thickness of the first and second to-be-welded materials 12 and 13. Irrespective of the size of the plate, it is always set constant regardless of the thickness of the plate, which causes wrinkles in the weld zone. It is easy to deform, and the weld quality of the welded parts is different depending on the welding length between the welding start point and the end point. Initially, the required welding quality is achieved, and gradually the first to-be-welded material 12 and the second welded material are made. The wrap portions of the welded material 13 were separated from each other, and eventually, welding was not performed or overheating occurred, resulting in a problem in that the welding strength was dropped along with the flash phenomenon. .

SUMMARY OF THE INVENTION The present invention has been made to solve such a conventional problem, and its object is to adequately secure and maintain the amount of overlap of welds according to the plate thickness of the first and second to-be-welded materials during seam welding. The present invention provides a mesh seam welding apparatus and a method for continuously making the welding target material continuously in the welding direction.

1 is a schematic configuration diagram showing a general mesh seam welding apparatus.

2 is a block diagram of a main part seen from the side of FIG.

Figure 3 is a schematic configuration diagram showing a mash seam welding apparatus according to the present invention.

4 is a block diagram of a main part viewed from the side of FIG.

5 is a schematic block diagram showing the main parts of the present invention.

6 is a schematic explanatory diagram for explaining seam welding.

* Explanation of symbols for main parts of the drawings

1 frame 2 first clamp device

6: second clamp device 12, 13: welded material

14: frame 15,16: cutter

17: disc electrode 18: weld

21,22 Cylinder 23 Image measuring sensor

24: Image processor 25: Welding overlap amount setter

26: secondary setter 27: comparison means

28: drive unit

As a technical configuration for achieving the above object, the present invention, in the apparatus for seam welding after overlapping each end of the plurality of welded material to a certain degree, the one welded material is fixed, the welding start point of the other welded material And the welding end point can move in the direction perpendicular to the direction welded by the different cylinders, and an image measuring sensor for detecting and transmitting the welded part to the rear side of the disc electrode for welding and installing it with the disc electrode The image measuring sensor is connected to an image processor for converting the image data into an overlap amount, and the output value of the weld overlap amount setter having an output value of the image processor and an overlap chip amount for a preset welded material. Comparing means arranged to compare with each other, the comparison means is to construct a cylinder installed at the end of welding That is, by being welded by the apparatus during a mesh, characterized in that to maintain the degree of the amount of weld overlap in certain maryeonham.

In addition, the present invention, one side of the welded material is fixed, the welding start point and the end point of welding of the other welded material to be moved in a direction perpendicular to the direction welded by different cylinders, the weld portion on the back side of the welding electrode Image data sensed by an image measuring sensor installed to move the disc electrode along with the disk electrode is converted into an amount of overlap by an image processor, and the amount of overlap of the image processor is set in advance. By comparing the output value of the welding overlap setter having the overlapping chip amount with the comparison means, if the overlapping chip amount of the image processor is larger than the output value of the welding setter, the cylinder installed at the welding end point is reversed and the welding end point of the welded material Move the parts away from each other, and the amount of overlapping chips of the image processor It depends upon the mash welding method being smaller than the output value of the group to move forward driving the cylinder installed on the welding end point, featuring Sikkim move an object to be welded weld end point portion in a direction to approach each other in maryeonham.

Hereinafter, the present invention will be described in more detail.

3 is a schematic configuration diagram showing a mesh seam welding apparatus according to the present invention, and FIG. 4 is a configuration diagram of a main part seen from the side of FIG. 3, which is the same as the configuration shown in FIGS. 1 and 2. The detailed description thereof will be avoided by giving a sign.

The present invention allows the second clamp portion 6b, which is installed on the second support portion 6a fixed on the frame 1, to be movable toward the welding portion side, to be supported by the plurality of cylinders 21 and 22, One cylinder 21 is installed at the start of welding to move the second clamp portion 6b in the left and right directions in FIG. 3, and the other cylinder 22 is installed at the end of the welding to clamp the second clamp. The part 6b is moved in the left-right direction of FIG.

In addition, the present invention has an image measuring sensor 23 on the rear side with respect to the welding direction line of the rotary disk 17 installed in the frame 14 to achieve the same linear behavior as the rotary disk 17, such a The image measuring sensor 23 moves from the upper side along the welding portion welded with the rotating disc 17 and detects the overlapping amount of the welded portion as an image, and the image measuring sensor 23 displays an image. Connected to the processor 24, the image processor 24 converts the weld image detected from the image measurement sensor 23 into a weld overlap amount length.

Also, reference numeral 25 denotes a weld overlap amount setter for setting an appropriate weld overlap amount according to the type and thickness of a material to be welded at present, and 26 is a weld width from an output of the weld overlap amount setter 25. Is a secondary setter for appropriately adjusting the overlapping amount of the welding end point before welding according to the type and thickness of the material in consideration of the change amount according to the change, and the reference numeral 24 denotes the output and image of the weld overlapping amount setter 25. Comparing means for receiving the output of the processor 24 and comparing the magnitude of each other, 28 receives the output value of the comparison means 24 and accordingly appropriately corresponding to the difference in the welding end clamp cylinder 22 It is a drive unit for driving.

The present invention first secures the first and second to-be-welded materials 12 and 13 by the first and second clamp jaws 2 and 6, and then to the upper and lower cutters 15 and 16. After the cutting, the welding start clamping cylinder 21 is driven by the driving unit 28 according to the output of the welding overlap setter 25 so as to overlap the predetermined amount according to the type and thickness of the welded material. . Next, according to the length of the welded material to be welded, the output of the secondary chamber 26 is added to the output of the weld lap setter 22, and the weld end portion of the clamping cylinder 22 is rounded to form a weld start portion. Let it overlap slightly more than the amount of overlap. Of course, these setting values are predetermined and input, and thus, optimal values may be determined by a plurality of experiments and experiences.

Subsequently, the weld 18 is sequentially welded by the disc electrode 17 by moving the frame 14 along the weld 18 as in the prior art.

At this time, the first and second to-be-welded materials 12 and 13 show a tendency to open toward the end portion of the welding by the thermal energy and the mechanical force generated from the disc electrode during welding, which is also the thicker the plate thickness. Significant differences are shown depending on the strength of the first and second to-be-welded materials 12 and 13.

In the present invention, first, an appropriate amount of overlap is set in advance according to the type and thickness of the material, which is limited to a range in which the thickness of the welded part after welding is not more than 10% of the average thickness of the welded material before welding, and then In order to prevent deformation of the welding material and to control the deformation of the welding material, the overlapping amount of the weld ends is overlapped by a predetermined amount. This setting value also varies depending on the type and thickness of the welded material, but the welding proceeds once. In this case, the set value does not become an appropriate value but becomes wider or narrower due to the above phenomenon.

At this time, the comparison between the set value of the weld overlap amount setter 25 and the current weld overlap amount detected by the image measurement sensor 23 and converted by the image processor 24 is compared by means of the comparison means 27. The amount of overlap is compensated by the cylinder drive unit 28 for the welding end portion clamp.

That is, if the current weld overlap is thicker than the set value, the output of the comparison means has a negative value and if it is thin, it outputs a positive value to determine the control amount for the reference set value, which is the overlap of the welding start. Do it.

Therefore, as the welding proceeds, the weld overlap is always adjusted to an appropriate level, whereby the quality of the weld is improved.

According to the mash seam welding apparatus and the method according to the present invention as described above, when the welded material is joined to each other by mash seam welding of the welded portion by the image measuring sensor to move along the weld portion When the amount of overlapping chips is continuously detected and the detected amount of overlap is out of the appropriate level, the welded materials are moved closer or farther away from each other by the cylinder for moving the welding end so that the overlap is at a certain level to improve the quality of the mesh seam welding. Has an effect.

In addition, by optimizing the overlapping amount, it is possible to prevent deformation and wear of the disc electrode, thereby improving stability of the installation.

Claims (4)

In the apparatus for seam welding after overlapping each end of the plurality of welded materials to a certain degree, one welded member 12 is fixed, and the welding start point and the end point of welding of the other welded material 13 are different from each other. (21) and (22) to move in a direction perpendicular to the direction welded, and the image measuring sensor 23 for detecting the welded portion and transmits to the image on the rear side of the original electrode for welding 18 Move together with the disc electrode 18, and the image measurement sensor 23 is connected to an image processor 24 for converting the image data into an overlap amount, and is set in advance with an output value of the image processor 24. Comparing means 27 are provided to compare the output values of the welding overlap amount setter 25 having the overlapping chip amount with respect to the welded material, and the comparing means 27 drives the cylinder 22 installed at the end point of welding. By doing Mesh welding system characterized in that the welding overlap is maintained to a certain degree. According to claim 1, wherein the welding overlap setter 25 is connected to the comparison means 27 through the secondary setter 26, the secondary setter 26 is welded overlap setter (25) The output value of) is the input value, and the overlap value of the weld end point is more than the overlap amount of the weld start point by correcting the input change value of the overlapping end point of the welded part set according to the thickness of the welded material and the length to be welded. Mesh seam welding apparatus characterized in that the enlargement. In the method of seam welding after overlapping each end of the plurality of welded materials to a certain degree, one welded member 12 is fixed, and the welding start point and the end point of welding of the other welded material 13 are different from each other. (21) and (22) to move in a direction perpendicular to the direction welded, is installed on the rear side of the electrode for welding electrode 18 to detect the welding portion and to transmit the image to the disk electrode (18) and The image data sensed by the image measuring sensor 23, which is to be moved together, is converted into the amount of overlap by the image processor 24, and the amount of overlap of the image processor 24 is set to the amount of overlapping chips for the to-be-welded material. Since the branch is compared with the output value of the welding plunger setter 25 by the comparing means 27, if the lap chip amount of the image processor 24 is larger than the output value of the welding setter setter 25, the cylinder 22 installed at the end point of welding. After Drive to move the welding end points of the welded material away from each other, and if the overlap chip amount of the image processor 24 is smaller than the output value of the welding set point setter 25, the cylinder 22 installed at the welding end point is moved forward to be avoided. A mash seam welding method, characterized in that for moving the end portion of the welding material in the direction closer to each other. 4. The welding overlap setter (25) according to claim 3, wherein the welding overlap setter (25) is connected to the comparing means (27) through the secondary setter (26), and the secondary setter (26) sets the weld overlap setter (25). The output value of) is the input value, and the overlap value of the weld end point is more than the overlap amount of the weld start point by correcting the input change value of the overlapping end point of the welded part set according to the thickness of the welded material and the length to be welded. Mesh seam welding method characterized in that the enlargement.