JPH0353072B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a welding device, and more specifically, the present invention relates to a welding device, and more specifically, it moves an object to be welded (hereinafter referred to as a workpiece) vertically relative to an electrode to achieve a required height for welding. By using a servo motor as a drive device for positioning, positioning accuracy can be improved and the operating time required for positioning can be shortened.
In addition, the present invention relates to a welding device that allows the positioning of a workpiece to be set steplessly.

[Prior Art] As is well known, there are various types of welding equipment, one of which is the welding machine side, which consists of an upper electrode and a lower electrode facing each other and separated from each other by a predetermined distance. There is a type that fixes the welding device to the main body of the welding device. By moving the workpiece in the front-rear direction (hereinafter referred to as the Y-axis direction), the left-right direction (hereinafter referred to as the X-axis direction), and the up-down direction (hereinafter referred to as the Z-axis direction) relative to the welding machine main body, respectively, The required welding position of the workpiece and the welding processing position are appropriately matched. Next, the workpiece is positioned with respect to the lower electrode, and the upper electrode is further hung down to weld the workpiece while it is being held between the welding electrodes, so that complicated welding processing requirements can be met. Such a welding device is disclosed in, for example, Japanese Utility Model Application Publication No. 138476/1983.

[Problems to be Solved by the Invention] In the case of the prior art disclosed in the above publication, the workpiece is temporarily positioned higher than the required height for welding by a positioning means, and then the upper electrode is welded. As the workpiece is positioned at the required height, the workpiece is lowered by a cylinder to the required welding height that matches the lower electrode, positioned at the required welding height, and welded.

Therefore, in order to accurately position the workpiece to the required processing height, the forward and backward movement of the piston shaft of the cylinder must be delicately controlled, which makes positioning troublesome and requires high precision. It was difficult to perform positioning.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to enable easy and highly accurate positioning of a workpiece.

[Means for Solving the Problem] The present invention has the following technical means to achieve the above object. That is, to explain this using the symbols corresponding to the examples, an object to be welded (work) is placed between an upper electrode and a lower electrode provided on a base, and the work is placed between the upper and lower electrodes. In a welding device that can be positioned vertically with respect to a welding electrode; comprising positioning means for positioning the workpiece 10 at a welding processing required position with respect to the upper electrode 5 and the lower electrode 6, the positioning means , a drive device including a servo motor 24, a transmission device for transmitting the driving force of the drive device, a lift plate 23 that is moved in the vertical direction by the drive device, and a lift plate 23 that supports the workpiece 10 and supports the workpiece 10. The workpiece receiver 11 is arranged to be movable up and down with respect to the lift plate 23, and there is elastic resilience between the lift plate 23 and the workpiece receiver 11 to flexibly support the workpiece receiver 11. A member 34 is provided, and by driving the servo motor 24,
The workpiece 10 placed on the workpiece receiver 11 is temporarily positioned at a position higher than the required welding height R, and then the upper electrode 5 is positioned at the required welding height R. This welding device is characterized in that by pressing the upper electrode 5, the workpiece 10 can be pulled down to the required welding height R matching the lower electrode 6 for trowel welding.

In addition, the second invention provides an object to be welded (workpiece) between the upper electrode and the lower electrode provided on the base.
In a welding device, the workpiece can be positioned in the vertical direction with respect to the upper and lower welding electrodes; for positioning the workpiece 10 at a welding processing required position with respect to the upper electrode 5 and the lower electrode 6; The positioning means includes a drive device including a servo motor 24, a transmission device for transmitting the driving force of the drive device, and a lift plate 23 that is moved in the vertical direction by the drive device. , and a workpiece receiver 11 that supports the workpiece 10 and is arranged to be vertically movable with respect to the lift plate 23. Between the lift plate 23 and the workpiece receiver 11, there is a An elastic resilient member 34 that flexibly supports the receiver 11 is provided, and the lift plate 23 and the workpiece receiver 1
A pull-down cylinder 50 is disposed between the workpieces 1 and 1, and by driving the servo motor 24, the workpiece 10 is temporarily positioned higher than the required height R for welding. This welding device is characterized in that it is capable of positioning and welding at the above-mentioned required height R for welding.

[Function] As described in detail above, first, in the process of vertically positioning the workpiece 10, the workpiece 10 is placed on the workpiece receiver 10, and the welding process is immediately requested by the drive device consisting of the servo motor 24. Temporarily position at a position higher than height R. The required welding height R at this time is determined by the height to which the lower electrode 6 is set.

Next, the upper electrode 5 is moved downward to position it at the required height R for welding. At this time,
As the upper electrode 5 moves downward, the workpiece 10 is transferred to the workpiece receiver 11.
At the same time, the workpiece 10 is moved to the required welding height R that matches the position of the lower electrode 6, the upper electrode 5 and the lower electrode 6 are electrically connected, and the workpiece 10 can be welded with the workpiece 10 correctly positioned at a predetermined position. become able to.

[Embodiment] Next, a first embodiment of the present invention will be described in detail with reference to the accompanying drawings FIGS. 1 to 5.

In the figure, 1 indicates a welding device main body, and 2 indicates a base constituting the welding device main body 1.

A welding electrode 4 is disposed on one side 3 of the base 2, and in this embodiment, the welding electrode 4
is composed of an upper movable electrode 5 and a lower fixed electrode 6.

And these upper electrode and lower electrode 5,
6 are pillars 7 each erected on one side 3 of the base 2.
It is attached to a pair of arm parts 8 of. The upper movable electrode 5 is mounted so as to be vertically movable opposite the lower fixed electrode 6 by an arbitrary driving means.

Further, on the other side 9 of the base 2, a workpiece support 11 for supporting a welded object (workpiece) 10 is arranged. This work receiver 11 holds the work 1
0 in the left-right direction (hereinafter referred to as the X-axis direction), the same front-back direction (hereinafter referred to as the Y-axis direction), and the same up-down direction (hereinafter referred to as the Z-axis direction) with respect to the welding electrode 4.
The workpiece 10 has positioning means in each of the X, Y, and Z axes for moving the workpiece 10 to a position required for welding.

To explain this specifically, the Y-axis direction positioning means is configured as follows. That is, the Y-axis moving body 13 is mounted on the Y-axis positioning rail 12 laid on the base 2 along the Y-axis direction. Further, a drive means for sliding the Y-axis moving body 13 in the Y-axis direction is provided within the Y-axis positioning rail 12. In this embodiment, the Y-axis direction driving means is constituted by, for example, a servo motor 14, a lead spline 15, etc., and the Y-axis direction moving body 13 is moved to the Y-axis direction positioning rail 12 by the Y-axis direction driving means. along the Y-axis so as to be slidable in the Y-axis direction.

Similarly, the X-axis direction positioning means
An X-axis moving body 17 is mounted on an X-axis positioning rail 16 laid along the axial direction, and the X-axis moving body 17 is slid in the X-axis direction by an X-axis driving means. It is freely arranged.

Further, the X-axis direction driving means is disposed within the above-mentioned X-axis direction positioning rail 16, and in this embodiment is constituted by, for example, a servo motor 18, a lead spline 19, etc. is arranged to be slidable in the X-axis direction.

The present invention is characterized by the configuration of the Z-axis direction positioning means 20, which will be described below. That is, Z
As the axial positioning means 20, a lift plate support plate 22 supported by a plurality of support members 21 is attached to the above-mentioned X-axis direction moving body 17, and a lift plate is further mounted on the lift plate support plate. Z for driving 23 in the Z-axis direction
Axial positioning means 20 are attached.

The Z-axis direction positioning means 20 includes a servo motor 24 as a drive device, a sprocket 25 as a transmission device, a rotating shaft 26, a bearing 27, and a chain 2.
It is composed of 8 mag. The above servo motor 24
is attached to a servo motor support member 29 that is vertically installed on the X-axis moving body 17 described above.

A sprocket attached to the output shaft of the servo motor 24 and the X-axis moving body 17
A plurality of sprockets 25 are attached to a plurality of rotating shafts 26 vertically provided above. Further, one end 30 of this rotating shaft 26 is rotatably fitted into a bearing 27 attached to the X-axis moving body 17, and the other end 31 is rotatably fitted into a bearing 27 attached to the lift plate support plate. It is pivoted on. Further, a lead spline 32 is attached to the other end 31 of the rotating shaft 26.

The lead spline 32 has a U-shaped receiving portion 3.
3, and this U-shaped receiving part 33
is screwed onto the lower surface of the lift plate 23 with bolts. Further, the free end of the lead spline 32 is passed through a hole formed in the lift plate 23.

Further, a chain 28 is wound between the sprocket 26 attached to the rotating shaft 26 and the sprocket 25 attached to the output shaft of the servo motor 24, and similarly, a chain 28 is wound between the sprocket 26 attached to the rotating shaft 26 and the sprocket 25 attached to the output shaft of the servo motor 24. A chain 28 is also wound around the sprocket.

Furthermore, a workpiece receiver 11 is arranged above the lift plate 23, and this workpiece receiver 1
1 has a plurality of legs 11a attached to it. The workpiece receiver 11 is supported by the plurality of legs 11a by elastic resilient members 34. For example, a coil spring is used as the elastic resilient member 34. At this time, the workpiece 10 on the workpiece receiver 11 is previously lifted by the coil spring 34 to a position Q higher than the required welding height R set by the lower fixed electrode 6. This results in
By utilizing the contraction of the spring 34, the workpiece 10 located higher than the required welding height R can be pulled down to the required welding height R by its own weight and positioned.

To explain this more specifically, the Z-axis direction positioning means 20 described above has a primary positioning function of positioning the workpiece 10 higher than the required height R for welding.

On the other hand, the coil spring 34
0 shrinks due to the weight of the workpiece 10, so the workpiece 10, which is at a position Q higher than the welding processing required height R, is lowered, and the weight of the workpiece 10 and the coil spring 34
When the workpiece 10 is shrunk until the tension of
It is provided with a secondary positioning function that enables fine adjustment by lowering the height R to the above-mentioned required welding height.

The workpiece 10 is positioned higher than the required height R for welding by the Z-axis direction positioning means 20.
, this time the upper movable electrode 5 causes the spring 34 to
The workpiece 10 is pushed down against the pressing force to position the workpiece 10 at the required height R for welding.

In this embodiment, a coil spring, for example, is used as the elastic restoring member 34, but other materials such as elastic rubber, urethane foam, etc. can also be used.

Further, in this embodiment, by using a servo motor 24 or the like as the positioning means, it is possible to easily set the position to any desired position steplessly.

Next, an example of use of this first embodiment will be explained.

First, as shown in FIGS. 1 and 5, the lower fixed electrode 6 is positioned at a predetermined height, and the required height R of the welding process is set. Then, the lift plate 23 is lifted by the Z-axis direction positioning means 20, and the workpiece receiver 11 is supported by the lift plate 23. Next, work receiver 1
A workpiece 10 is fixed on top of the workpiece 1. At this time, work 1
0 is located at a position Q higher than the required welding height R.
At this time, the workpiece 10 is at a position Q higher than the required height R for welding. In this state, workpiece 0 is positioned in the X and Y axis directions.

As mentioned above, since the workpiece 10 is located at the position Q higher than the required height R for welding, the positioning in the X and Y axis directions can be done properly and easily without the workpiece 10 and the electrodes (especially the lower electrode 6) colliding with each other. can be done.

This state is shown in FIG. After positioning in the X and Y axis directions, positioning in the Z axis direction is performed. That is, the servo motor 24, which is the Z-axis positioning means 20, is driven according to a predetermined height of the lift plate 23, which is preset by the control device 35, which is the Z-axis positioning means 20. As a result, the chain 28 wound between the sprocket attached to the output shaft of the servo motor 24 and the sprocket of the rotating shaft 26 for lifting the lift plate 23
As a result, the rotating shaft 26 is driven in a predetermined direction. At this time, a plurality of rotating shafts 26 are disposed on the lift plate 23, and a chain 28 is also wound between the sprockets 25 between the plurality of rotating shafts 26, so that the driving force of the servo motor 24 is transferred. Can be transmitted evenly.

Therefore, positioning can be performed to a preset height with high precision and in a short operating time. Therefore, the workpiece 10 placed on the workpiece receiver 11 on the lift plate 23 can be accurately positioned at a position Q higher than the required welding height R. At this time, the workpiece 10 is lifted higher than the required welding height R, and is once positioned within a range that does not exceed the maximum compression width of the spring 34 from the required welding height R.

Next, the upper movable electrode 5 is moved down. The workpiece 10 that has been primarily positioned and is located at a primary positioning height Q that is higher than the required welding height R is moved by the spring 34.
The primary positioning height Q and the required welding height R are
While being finely adjusted to eliminate the deviation (R-Q), the welding height is lowered to the required welding height R and positioned at the secondary required welding height.

By using the servo motor 24 and the like in this way, it is possible to easily position the work 10 to the primary positioning position Q quickly and accurately.

In addition, the workpiece 10 is not positioned and fixed at the same time and then brought into contact with the welding electrode 4, but the workpiece 10 is not displaced or deformed during the welding process while the electrodes are in contact at the same time, and the electrode It is possible to effectively prevent welding defects due to poor pressurization, poor contact, etc.

In addition, in this embodiment, the servo motor 14,
These servo motors 14, 18, 24 are controlled by a control device 35. Therefore, positioning can be performed accurately and precisely on the X, Y, and Z axes.

Next, a second preferred embodiment of the present invention will be described in detail with reference to FIGS. 7 to 10 of the accompanying drawings.

In this second embodiment, only the differences from the above-described first embodiment will be explained. In this embodiment, the Z-axis direction positioning means 40 uses a servo motor 24, a rack gear 41, a pinion gear 42, etc. to lift the lift plate 23 to a predetermined position. To explain this more specifically, the servo motor 24 is attached to a support member 43 that is vertically installed on the Y-axis direction moving body 17. Further, a plurality of pinion gears are attached to a drive shaft 44 connected to the output shaft of the servo motor 24, and a rack gear 41 meshes with the pinion gear, and a shaft 46 is attached to one side 45 of the rack gear 41. , this axis 4
6 is screwed onto the lift plate 23 with bolts or the like.

The rack gear 41 is fitted into a U-shaped guide 47 and is disposed to be slidable in the vertical Z-axis direction as the pinion gear rotates. In this embodiment as well, the servo motor 24 is controlled by a control device as in the first embodiment.

Further, in this embodiment, the structure itself can be made relatively simple.

Next, FIG. 10 shows a modification of the second embodiment described above, in which a pull-down cylinder 50 is disposed on the lift plate 23, and the piston rod 51 of this pull-down cylinder 50 is moved to the workpiece receiver 1.
It is attached to 1.

Therefore, when the workpiece 10 itself has a complicated shape or is extremely thin, the workpiece 1 whose tensile strength is smaller than that of the elastic resilient member 34, such as a coil spring, etc.
It is convenient to use it to lower the height R of 0, etc. to a predetermined required height R of welding.

This makes it possible to adapt to any material or shape of the workpiece.

Furthermore, although the lower fixed electrode 6 wears out over time, by operating the pull-down cylinder 50, the position relative to the lower fixed electrode 6 can be finely adjusted, so that the workpiece 10 can be welded uniformly. You will be able to do this with high precision.

Note that the other configurations are substantially the same as those of the first embodiment described above.

Next, an example of use of this second embodiment will be explained.

In this case as well, only the differences from the usage example of the first embodiment described above will be explained. First, the servo motor 24 is driven via the control device of the Z-axis direction positioning means, and the work 10 is positioned at a position Q higher than the required height R for welding. To explain this specifically, by driving the servo motor 24, a drive shaft 44 connected to the output shaft of the servo motor 24 is driven in a predetermined direction. At this time, the pinion gear attached to the drive shaft 44 is driven, and the rack gear 41 meshing with the pinion gear is driven in the U-shaped guide 47 in the vertical direction and the Z-axis direction. Then, the shaft 46 attached to one side 45 of this rack gear 41
is similarly driven in the Z-axis direction, and since this shaft 46 is attached to the lift plate 24, it is lifted to a predetermined position using the support member 21 of the lift plate 24 as a guide. Therefore, the workpiece receiver 11 located on this lift plate 24
The workpiece 10 disposed at is once positioned to a position Q higher than the welding processing request position R. Therefore, the workpiece 10 can be lifted to a predetermined position accurately, with high precision, and quickly.

Next, a usage example will be explained. That is, in this case, the shape and material of the work 10 may be extremely thin, the work 10 may have less rigidity than the tension of the elastically restoring member 34 such as a coil spring, or the work 10 may have a complicated shape with steps. Then, the workpiece 10 is welded by first positioning it at a position higher than the required welding height R, and then lowering the workpiece receiver 11 to the required welding position R using the pull-down cylinder 50 and positioning it.

Therefore, it is easy to adapt to any shape or material of the workpiece 10, and even if the lower fixed electrode 6 is worn out over the course of welding use, the welding position can be finely adjusted by the pull-down cylinder 50. , it is possible to perform good welding for a long time. The other aspects are substantially the same as the usage example of the first embodiment described above.

[Effects of the Invention] As detailed below, the first invention of the present application uses the servo motor 24 as a device determining means for positioning the workpiece 10 above the required height R of welding. , it is possible to provide a welding device that can position the workpiece 10 with high precision and steplessly.

Furthermore, by using the servo motor 24 as a positioning means, the workpiece 10 can be adjusted to the required height R for welding.
It is possible to provide a welding device that can shorten the operation time for positioning the welding device upward and improve the work efficiency.

In addition, since a servo motor is used as the positioning means and the positioning can be finely adjusted by the elastic restoring member 34, the workpiece 10 can be accurately positioned at the required height R for welding. A welding device that can be supported flexibly, facilitates positioning when workpieces have many steps or when multiple workpiece positioning jigs are used, and can be adapted easily and quickly. Can be provided.

Next, the second invention of the present application can provide a welding device that can precisely position an extremely thin workpiece or a workpiece whose rigidity is smaller than the tension of a spring to a required height for welding processing.

In addition, there are various practical advantages such as providing a welding device that can accurately position the workpiece at the required height for welding and finely adjust the height of the workpiece against wear of the lower electrode as the workpiece welds. It has advantages.

[Brief explanation of drawings]

The accompanying drawings FIGS. 1 to 6 show a first embodiment of the present invention, and FIG. 1 is a side view showing the entire welding device;
2 is a front view seen from arrow P in FIG. 1, FIG. 3 is a side view showing the positioning in the X and Y axis directions, and FIG. 4 is an enlarged view of the Z axis positioning means.
FIG. 5 is an operational diagram showing the Z-axis direction positioning means driven, FIG. 6 is a block diagram showing the control device, and FIGS. 7 to 10 show a second embodiment of the present invention. , FIG. 7 is a side view showing the entire device, FIG. 8 is a front view seen from arrow S in FIG. 7, FIG. 9 is an enlarged view of the Z-axis direction positioning means, and FIG. Each shows an enlarged view of a pull-down cylinder that is a positioning means. In addition, in the figure 1... welding device, 5... upper electrode,
6... Lower electrode, 10... Workpiece, 11... Workpiece receiver, 23... Lift plate, 24... Servo motor, 34... Elastic resilience member, 50... Lowering cylinder, R... Welding processing requirement , respectively.

Claims (1)

[Claims] 1. An object to be welded (workpiece) is placed between an upper electrode and a lower electrode provided on a base, and the workpiece is positioned in the vertical direction with respect to the upper and lower welding electrodes. In the welding apparatus that enables the above-mentioned welding device; a positioning means for positioning the work 10 at a welding required position with respect to the upper electrode 5 and the lower electrode 6, the positioning means comprising a drive device including a servo motor 24; , a transmission device for transmitting the driving force of the drive device, a lift plate 23 that is moved in the vertical direction by the drive device, and a lift plate 23 that supports the workpiece 10 and is movable up and down with respect to the lift plate 23. An elastic resilient member 34 is disposed between the lift plate 23 and the workpiece receiver 11 to flexibly support the workpiece receiver 11. By driving the servo motor 24,
The workpiece 10 placed on the workpiece receiver 11 is temporarily positioned at a position higher than the required welding height R, and then the upper electrode 5 is positioned at the required welding height R. A welding device characterized in that by pressing the upper electrode 5, the workpiece 10 can be pulled down to a required welding height R matching the lower electrode 6 for trowel welding. 2. In a welding device in which a workpiece is disposed between an upper electrode and a lower electrode provided on a base, and the workpiece can be positioned vertically with respect to the upper and lower welding electrodes. has a positioning means for positioning the workpiece 10 at a welding required position with respect to the upper electrode 5 and the lower electrode 6; A transmission device for transmitting force, a lift plate 23 that is moved vertically by the drive device, and a workpiece receiver that supports the work 10 and is arranged to be vertically movable with respect to the lift plate 23. 11, and an elastic resilient member 34 that flexibly supports the workpiece receiver 11 is disposed between the lift plate 23 and the workpiece receiver 11; Uke 1
A pull-down cylinder 50 is disposed between the workpieces 1 and 1, and by driving the servo motor 24, the workpiece 10 is temporarily positioned higher than the required height R for welding. A welding device characterized by being capable of positioning and welding at the required welding height R.