JPH02147198A - Device for positioning work - Google Patents

Abstract

PURPOSE:To always fixedly keep the working origin to a later stage in spite of the dimensional change of a work by positioning the work with reference to one of four corners of the work having a rectangular plate shape. CONSTITUTION:When the work 11 is sent from a conveyor to a delivering position, it abuts positioning blocks 36a,37a and stops there. The work 11 is abutted by the operation of a liquid pressure cylinder 20 on a reference positioning block 21b to advance a reference corner plate 18 to the side of a corner plate 22. The corner plate 22 is advanced by the operation of a cylinder 24 to the side of the reference corner plate 18 through a positioning block 25b and the reference positioning block 21b. Further, while all remaining liquid pressure cylinders 30,31,34,35 are operated and the work 11 abuts positioning blocks 36a,36b,37a,37b, the work 11 is pressed to the sides of the reference positioning blocks 21a,21b and positioned.

Description

DETAILED DESCRIPTION OF THE INVENTION A. Industrial Utilization The present invention relates to a workpiece positioning device for always fixing a rectangular plate-shaped workpiece brought in in a horizontal state in a fixed position, and in particular, This is suitable for automatically performing work on a workpiece.

B. Summary of the Invention The four corners of a rectangular plate-shaped workpiece brought in in a horizontal state are held by four corner plates, and the remaining three corner plates are held with one of these four corner plates as a reference. It is moved relative to a corner plate that serves as a reference, so that one corner of the workpiece is always fixed at a fixed position.

C. Prior Art A switchboard in which various instruments, control and adjustment equipment, switches, relays, etc. are housed, as shown in Figure 4, which shows the external appearance of its vertically self-supporting frame, has the above-mentioned various 8JI devices. A basic frame body is formed by a floor plate 1 to be mounted, columns 2 extending vertically upward from each of the four corners of this floor plate 1, and a top plate 3 joined to the upper ends of these columns 2. Wall panels and doors that can be opened and closed can be assembled. If the switchboard is small and lightweight, the floor plate 1 and top plate 3 are connected to the pillars 2 using fasteners such as bolts and nuts; however, in the case of a large and heavy switchboard, the floor plate 1 and top plate 3 are The plate 3 and the support column 2 are generally welded together via a reinforcing corner piece 4 called a gusset.

As shown in FIG. 4 and FIG. 5, which is an enlarged view of the part shown in the direction of arrow (■), the corner piece 4 has three planes perpendicular to each other, and a brazing material (not shown) is poured into the connecting hole 5 formed in advance, and the floor plate 1, the support column 2, and the top plate 3 are welded together.

When manufacturing a frame using this corner piece 4, usually the corner piece 4 is first joined to the four corners of the floor plate 1 and the top plate 3, and then both ends of the support column 4 are connected via the corner piece 4 to the floor plate 1 and the top plate 3. It is connected to plate 3. Therefore,
If the positional accuracy of the corner piece 4 with respect to the floor plate 1 and the top plate 3 is not kept high, the frame will become distorted,
The installation of wall panels, etc. deteriorates. Therefore, in the past, a floor plate or a top plate was placed on a surface plate, and a commercially available clamp jig was used to fix the floor plate or top plate to the surface plate, while corner pieces were pressed against the four corners of the floor plate or top plate. These corner pieces are also fixed to the floor plate or top plate in a positioned manner using a commercially available clamp jig, and then the corner pieces are welded to the floor plate or top plate.

D. Problems to be Solved by the Invention When manufacturing the frame of a power distribution board by welding, in order to automate this series of operations, it is natural to follow the changes in the size and shape of the floorboards and top boards. It is necessary to fix the top plate at a fixed position on the surface plate.

However, in the past, the operator had to change the position of the clamp jig each time, which was time-consuming and reduced work efficiency.

E. Means for Solving the Problems The workpiece positioning device according to the present invention includes a first corner plate protruding from a pair of positioning blocks that abut each first corner of a rectangular plate-shaped workpiece; a second corner plate protruding from a pair of positioning blocks that abut the first corner of the workpiece and a second corner adjacent to the workpiece; and a second corner plate located diagonally to the first corner of the workpiece. and a third corner plate protrudingly provided with a pair of positioning blocks that abut the second corner and the third corner adjacent to the workpiece, respectively, and the first corner and the third corner of the workpiece. a fourth corner plate having a pair of protruding positioning blocks abutting each adjacent fourth corner; The workpiece positioning device is configured to slightly enlarge the workpiece toward the four corner plates and hold the four corners of the workpiece with the four corner plates, the first corner plate being fixed at a fixed position, and the first corner plate being fixed at a fixed position, The second corner plate is provided so that it can be retracted in a direction perpendicular to the transport direction when a workpiece is carried in, and the second corner plate can be retracted in a direction parallel to the moving direction of the first corner plate, or vice versa. The pressing of the workpiece to the corner plate side is movable, and the third corner plate and the fourth corner plate are moved in two directions, a direction parallel to the carrying direction of the workpiece and a direction perpendicular thereto. The present invention is characterized in that it is movable for retracting or, conversely, for pressing the work toward the first corner plate.

F. Operation When carrying in a workpiece, if all corner plates are evacuated and the workpiece is fed in horizontally, the workpiece will collide with the positioning blocks of the third and fourth corner plates and stop. do.

From this state, the first corner plate is advanced to a predetermined position, the second corner plate is advanced to the first corner plate side, and the workpiece is moved to the first corner plate side in a direction perpendicular to the carrying direction. The two corners of the workpiece are held between the positioning block of the first corner plate and the positioning block of the second corner plate. Then, the third corner plate and the fourth corner plate are advanced toward the first corner plate, and the workpiece is pressed toward the first corner plate in the opposite direction to the carrying direction, so that the four corner plates as a whole are With the positioning blocks in contact with the four corners of the workpiece, the workpiece is positioned with reference to the first corner plate.

G. Embodiment FIG. 1 and its main parts show a schematic structure of an embodiment in which the workpiece positioning device according to the present invention is applied to positioning the top plate constituting the frame of the switchboard shown in FIGS. 4 and 5. As shown in Figure 2, which shows the extracted image, and Figure 3, which shows its appearance,
The workpiece 11 is transferred from the stock position A to the transfer conveyor 12, and the workpiece is fed onto the standby workpiece positioning device 13 at the transfer position [B, and further transferred to the workpiece processing position 1IIC. After the predetermined welding work is performed by the articulated welding robot 14, the workpiece holder moves from the transfer position B again to the transfer conveyor 12.
The work is carried out to the workpiece carry-out position.

The workpiece transfer conveyor 12 is at the stock position A, the workpiece transfer position B, and the workpiece delivery position r! It has a structure that can be indexed and rotated so that the workpiece 11 can be transferred between the receiver and ID, and a work table (not shown) for placing the workpiece 11 is provided at the stock position MA and the workpiece unloading position, respectively. It is provided.

The workpiece holder is mounted on a bed 15 provided across the transfer position B and the workpiece processing position ilC, and is reciprocated between the transfer position B and the workpiece processing position C by a driving means (not shown). A guide rail 17 for guiding the slide table 16 is formed, and the workpiece positioning device 13 of the present invention is provided on this slide table 16. That is, a reference corner plate 18 that supports the lower left corner of the workpiece 11 in FIG. 2 is provided at the lower right corner of the slide table 16 in FIG. The corner plate base] 9 fixed on the corner plate base 16 is moved in the left-right direction in FIG. 2 by the hydraulic cylinder 20.
It is possible to move. Then, on the reference corner plate 18, a second
In the figure, a pair of reference positioning blocks 21a and 21b that abut the lower right corner of the workpiece 11 are provided so as to project at right angles to each other. A corner plate 22 supporting the lower left corner of the work 11 in FIG. 2 is provided at the lower left corner of the work table 16 in FIG. With respect to the corner plate base 23 fixed above, the corner plate base 23 can be reciprocated in the left-right direction (direction facing the reference corner plate 18) in FIG. 2 by a fluid pressure cylinder 24. On this corner plate 22 is a pair of positioning blocks 25a that abut the lower right corner of the workpiece 11 in FIG.

The positioning blocks 25b protrude at right angles to each other, but the positioning block 25m is set so that the positioning block 25a and the aforementioned reference positioning block 21a are located on the same plane. Furthermore, in FIG. 2, a second
In the figure, corner plates 26 and 27 are provided to support the upper left and right corners of the workpiece 11, respectively. These corner plates 2
6.27 is reciprocated in the left-right direction in FIG. Furthermore, hydraulic cylinders 3 are installed for these cross rails 32 and 33, respectively.
4°35, it is possible to reciprocate in the vertical direction in FIG. A pair of positioning blocks 36 a and 36 b that abut the upper left corner of the workpiece 11 in FIG. Although the protrusions are provided, the positioning blocks 36a and 36b are fully positioned so that they are parallel to the reference positioning block 21a, and the positioning blocks 36b are parallel to the reference positioning block 21b.

On the other hand, on the corner plate 27 located diagonally to the corner plate 22, a pair of positioning blocks 37a and 37b, which are in contact with the lower right corner of the workpiece 11 in FIG. However, the positioning block 37a is positioned parallel to the reference positioning block 21a, and the positioning block 37b is positioned parallel to the reference positioning block 21b.

In this embodiment, in accordance with the dimensions and shape of the workpiece 11, an adjusting table 38 is provided which can move the corner plate base 23° 28 on the left side in FIG.
It is installed above. The corner plate base 29 is also movable on the slide table 16 in the direction opposite to the reference corner plate 18 (in the vertical direction in FIG. 2), and the corner plate base 28 on the adjustment table 38 is also movable in this direction. It is movable on the adjustment table 38 in a direction opposite to the corner plate 22 (vertical direction in FIG. 2).

The working fluid pressure of the fluid pressure cylinder 20 is set higher than the working fluid pressures of the other fluid pressure cylinders 24, 30, 31, 34, and 35, and is set to a stroke end position of the reference corner plate 18 on the corner plate 22 side as a reference. In FIG. 2, the lower right corner of the workpiece 11 is always positioned at a fixed position on the slide table 16.

In actual work, first adjust the position of the adjustment table 38 with respect to the slide table 16 according to the dimensions of the workpiece 11, and also adjust the position of the corner plate base 29 with respect to the reference corner plate 18 and the corner plate base 28 with respect to the corner plate 22. Adjust the position of each.

After that, the work receiver turns the transfer conveyor 12 clockwise by 90 degrees from the state shown in FIG. Now turn the conveyor 12 90 degrees counterclockwise and transfer the workpiece 11 to the sinking position MB.
The workpiece is then fed onto the standby workpiece positioning device 13. At this time, the reference corner plate 18 is retracted to the right in FIG. 1 by the fluid pressure cylinder 20, and similarly, the corner plate 22 is retracted to the left in FIG. 1 by the fluid pressure cylinder 24.

Furthermore, the corner plates 26 and 27 are also connected to the fluid pressure cylinders 30, 31, 34.
, 35, they are in a retracted state. The workpiece receiver transfers the workpiece 11 from the flow conveyor 12 to the transfer position 111.
When the workpiece 11 is fed into the position B, the workpiece 11 comes into contact with the positioning blocks 36a and 37a and stops. From this state, the fluid pressure cylinder 20 is operated, and the reference positioning block 2
The reference corner plate 18 is advanced toward the corner plate 22 while the work 11 is brought into contact with 1b. Next, the fluid pressure cylinder 24 is operated to position the positioning block 25b and the reference positioning block 2.
The corner plate 22 is advanced toward the reference corner plate 18 so that the work 11 is held between the corner plates 1b and 1b. At this time, the fluid pressure cylinder 24
Since the force is weaker than the force of the hydraulic cylinder 20 on the reference corner plate 18 side, the workpiece 11 is positioned at the stroke end position of the hydraulic cylinder 20. Further, the remaining fluid pressure cylinders 30, 31, 34, and 35 are all activated to push the work 11 toward the reference positioning blocks 21n and 21b with the work 11 in contact with the positioning blocks 36a, 36b, 37a, and 37b. , the workpiece 11 is positioned.

In this state, the slide table 16 is operated and moved to the workpiece processing position C, and the welding robot 14 automatically welds the corner pieces 39 temporarily fixed to the four corners of the workpiece 11, the studs 40, etc.

Workpiece 111: Once the machining is completed, the slide table 16 returns to the workpiece transfer position B, and all fluid pressure cylinders 20.24° 30.31, 34, 35
Operate again to remove the reference corner plate 18 and the corner plates 22, 26, 27.
evacuate and move. Then, the workpiece is transferred to transfer conveyor 1.
After passing the processed workpiece 11 to the conveyor 12, the workpiece transfer conveyor 12 turns 90 degrees counterclockwise in FIG. . Next, the workpiece transfer conveyor 12 picks up the unprocessed workpiece 11 waiting at the rotating plate stock position A by 180 degrees and starts the next operation.

11 Effects of the Invention According to the workpiece positioning device of the present invention, the workpiece is positioned based on one of the four corners of the rectangular plate-shaped workpiece, so even if the dimensions of the workpiece change, It is possible to always keep the work origin constant until the subsequent process, which is very advantageous when planning to automate various tasks. Furthermore, since the structure of the device itself is simple, it can be highly reliable.

[Brief explanation of the drawing]

Fig. 1 is a layout diagram of an embodiment of a workpiece positioning device according to the present invention, Fig. 2 is a plan view of its main parts, Fig. 3 is a perspective view of a state in which a workpiece is positioned, and Fig. 4 is an object of the present invention. FIG. 5 is an enlarged cross-sectional view of the part viewed from the arrow . Also, in the figure, 11 is a workpiece, 13 is a workpiece positioning device, 16 is a slide table, 1B is a reference corner plate, and 19
, 23, 28, 29 are corner board pace, 20, 24, 30,
31, 34, 35 are fluid pressure cylinders, 21a, 21b are reference positioning valves, 25 a, 25 b, 3
6 m, 36 b. 37a and 37b are positioning blocks, 32 and 33 are cross rails, 38 is an adjustment table, 39 is a corner piece, and 40 is a stud. Patent Publishing Co., Ltd. Osamu Akiyo

Claims (1)

[Claims] A first corner plate protrudingly provided with a pair of positioning blocks that abut each first corner of a rectangular plate-shaped workpiece, and a second corner plate adjacent to the first corner of the workpiece, respectively. a second corner plate protruding from a pair of abutting positioning blocks; and a third corner plate located diagonally to the first corner of the workpiece and adjacent to the second corner. a third corner plate protrudingly provided with a pair of contacting positioning blocks; and a pair of protruding positioning blocks abutting each fourth corner adjacent to the first corner and the third corner of the workpiece. and a fourth corner plate, and the workpiece is carried from the first corner plate and second corner plate side to the third corner plate and fourth corner plate side, and the four corners are A workpiece positioning device configured to be held by the four corner plates, wherein the first corner plate is fixed at a fixed position and can be retracted in a direction perpendicular to the carrying direction when the workpiece is carried in. The second corner plate is provided so that it can be moved in a direction parallel to the movement direction of the first corner plate, or conversely, the workpiece can be pressed against the first corner plate, The third corner plate and the fourth corner plate are retracted in two directions, parallel to and perpendicular to the direction in which the work is carried in, or conversely, the work is moved toward the first corner plate. A workpiece positioning device characterized in that it is provided so as to be able to press and move.