JPS605415B2 - Positioning and clamping method of workpiece - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for positioning and clamping a workpiece, such as a petal-shaped section of a spherical tank for LNG, which is positioned on a cutting device and then clamped.

The section of the spherical tank for LNG is shown in Figure 2B or Figure 3B.
When cutting a petal-shaped piece as shown in Fig. 1, it is necessary to position the piece on the stand of the cutting device and then clamp it. Alternatively, it is not appropriate to hold and clamp the edge of the petal-shaped section with a presser metal fitting because the presser metal fitting interferes with the cutting device.

Furthermore, when the petal-shaped pieces are held by magnetic force, there is a problem in that the petal-shaped pieces cannot be clamped when they are made of aluminum. The present invention addresses the above-mentioned problems by raising the reference seat and the moving support device, placing the periphery of the center of the workpiece thereon, and then lowering only the reference seat to place the workpiece on top of them. The workpiece is supported so as to be movable in the front, back, left, and right directions using the same moving support device, and then the centering device is raised and the drive roller of the centering device is driven to move the workpiece in the front, back, left, and right directions, and horizontally. Then, the concentricity device is lowered and the large flea suction device is raised to suction and hold the center part of the workpiece from below.
Next, the large-diameter suction device that is currently suctioning and the moving support device are lowered, and the periphery of the center of the workpiece is pressed against the lowered reference seat to position it in the height direction, and then the small-diameter suction device is raised. The outer periphery of the workpiece is suctioned and held from below, and the burr prevention device is raised to support the outer periphery of the workpiece from below.Then, the small suction device that is currently suctioning is lowered to hold the outer periphery of the workpiece. This method of positioning and clamping a workpiece is characterized in that clamping is completed by pressing the workpiece against the burr stopper, and the objective is that the positioning and clamping device does not interfere with the processing equipment during processing after clamping.

It can also be clamped when the workpiece is aluminum.
The workpiece can be positioned accurately both horizontally and vertically. The safety of workers can be ensured when positioning in the horizontal direction. Another object of the present invention is to provide an improved method for positioning and clamping a workpiece, which can firmly clamp the outer periphery of the workpiece to withstand heavy cutting. The workpiece positioning and clamping method of the present invention is configured as described above,
Since the positioning and clamping device is not above or to the side of the workpiece when clamping is completed, the positioning and clamping device does not interfere with the processing device during subsequent processing.
Furthermore, since the workpiece is suctioned and held by the large-diameter and small-diameter suction devices that utilize vacuum pressure, even when the workpiece is made of aluminum, it can be clamped. In addition, as mentioned above, the centering device is raised, and the driving roller of the concentric device is driven to move the workpiece in the front, back, left and right directions, and the horizontal positioning is performed with the Oyo suction device that is being sucked. By lowering the support device and pressing the periphery of the center of the workpiece against the lowered reference seat to position the workpiece in the height direction, it is possible to accurately position the workpiece in both the horizontal and height directions. .
Further, as described above, after raising the reference seat and the moving support device and placing the periphery of the center part of the workpiece on these, only the reference seat is lowered and the workpiece is placed on the moving support device. The centering device is then raised and the drive roller of the concentricity device is driven to move the workpiece in the front, back, left and right directions and position it in the horizontal direction. There is no need to move the workpiece (heavy object) in one direction, and the safety of workers can be ensured when positioning in the horizontal direction. After performing the above-mentioned horizontal and height positioning, the small-diameter suction device is raised to suction and hold the outer periphery of the workpiece from below, and the burr prevention device is raised to suction and hold the outer periphery of the workpiece from below. support,
Next, the small-diameter suction device that is currently suctioning is lowered and the outer periphery of the workpiece is pressed against the burr prevention device to complete clamping, so that the outer periphery of the workpiece can be firmly clamped to withstand heavy cutting. The present invention also provides a swingable reference seat that descends to determine the height position of the workpiece, a swingable moving support device that rises to support the workpiece so that it can be moved forward, backward, left, and right; A first centering device that rises and moves the workpiece in the front-back direction with a drive roller, a second centering device that rises and moves the workpiece in the left-right direction with a drive roller, and a second centering device that rises and moves the workpiece in the left-right direction with a drive roller. It has large-diameter and small-diameter suction devices that suction and hold the workpiece, and a swivel-preventing device that rises and comes into contact with the workpiece, and the large-diameter suction device is arranged in the center of the pedestal, The reference seat, the moving support device, and the first and second centering devices are arranged in plural numbers around the same large-diameter suction device, and the small-diameter suction device and the burr prevention device are arranged around the same large-diameter suction device. The workpiece positioning and clamping device is characterized in that the workpiece positioning and clamping devices are arranged alternately around the workpiece, and the positioning and clamping method described above can be carried out smoothly. That is, when the reference seat and the moving support device are raised and the central part of the workpiece is placed on them, and when only the reference seat is lowered and the workpiece is placed on the moving support device. When supported so as to be movable in the front, rear, left and right directions, it is supported at several points and can be swung, so even if the workpiece has a special shape, such as a petal-shaped piece, it can be supported reliably. Next, the first and second centering devices are raised, and the drive rollers of each centering device are driven to move the workpiece back and forth and left and right to position it in the horizontal direction. is similarly supported. Next, the centering devices are lowered and the large-diameter suction device is raised to suction and hold the center part of the workpiece from below, and then the Oyo suction device and the moving support device that are being suctioned are is lowered and the periphery of the center of the workpiece is pressed against the lowered reference seat to position the workpiece in the height direction. However, the suction device has a large diameter and a large suction force, and it Coupled with this action, the workpiece is evenly pressed against each reference seat. Next, the small-diameter suction device is raised to suction and hold the outer periphery of the workpiece from below, and the burr prevention device is raised to support the outer periphery of the workpiece from below, and then the small-diameter suction device that is being suctioned is Clamping is completed by lowering the workpiece and pressing the outer periphery of the workpiece against the same burr prevention device. However, the small suction device and the burr prevention device are arranged alternately, so that the outer periphery of the workpiece is pressed during heavy cutting. Clamped tightly to withstand. Therefore, the positioning and clamping method described above can be carried out smoothly. Next, the method for positioning and clamping a workpiece according to the present invention will be explained with reference to the embodiment shown in FIGS. 1 to 14. In FIGS. 1 and 2, 1 is a cutting device, 2 is a table of the cutting device 1, is a stand on it, 4 is a petal-shaped section (workpiece material), 9 is the above-mentioned stand, a large-diameter suction device is placed in the center of 3, 5 is a reference seat placed at four places around it, 6 7a is a first centering device placed on the left and right sides of the large-diameter suction device 9, and 7b is a second centering device placed outside of the large-diameter suction device 9. , 8 is a burr prevention device arranged at 24 locations around each of the above-mentioned devices 5, 6, 7a, 7b, 9, and 10 is a small diameter suction device arranged between each of the burr prevention devices 8. The devices 5 to 10 are arranged as shown in FIG. 3A when the petal-shaped section 4 is as shown in FIG. 3B.

Next, the reference seat 5 will be explained in detail with reference to FIG.
11 is a cylinder support installed on the pedestal 3, 12
The fluid pressure cylinder which was defeated by the same cylinder support 11,
13 is an elevation guide member mounted on the cylinder support 12; 14 is a central shaft that is iron-mounted within the elevation guide member 13 so as to be able to move up and down, and whose lower end is screwed to the piston rod 12a of the hydraulic sill 12; 15 is a spherical seat support screwed onto the concentric shaft 14; 16 is a spherical seat mounted on the spherical seat support 15; 17 is a bolt for swingably attaching the spherical seat 16 onto the spherical seat support 15; 18a, 18
b is a limit switch for confirming the elevation of the spherical seat 16, 19a
, 19b are the dogs of the respective switches 18a, 18b, and when the fluid pressure cylinder 12 is operated in the expansion/contraction direction, the center shaft 14
The spherical seat support 15 and the spherical seat 16 are designed to move up and down. Next, the moving support device 6 will be explained in detail with reference to FIGS. 5, 6, and 7. 20 is a fluid pressure cylinder mounted on the pedestal 3, and 21 is screwed into a piston rod 20a of the fluid pressure cylinder 20. The central axis 21a is the same central axis, 2
a movable plate 23, which is swingably attached to the central shaft 21 via the spherical seat 21a;
is a steel ball holding odor that rotatably supports three steel balls 24,
It is attached on the movable plate 22. Further, 25 is a section support plate placed on each of the steel balls 24, 26 is a support suspended from the support plate 25, 27 is the same support, 2
6, hooks attached to three locations, 28, hooks attached to three locations on the movable plate 22, 29, opposing hooks 27,
A spring 30 is suspended between the center koji 21 and the lower movable plate 22, and the part above the movable plate 22 is always held in a horizontal position by the spring 30. The support plate 25 is always held at the center position by three steel balls 24 and three springs 29 (fifth
(see figure), but when the petal-shaped section 4 is placed on the support plate 25,
The part above the movable plate 22 follows the shape of the section 4 and shakes its head, and when the section 4 moves in the front, back, left and right directions, the support plate 25 follows the movement of the section 4 and is displaced ( 6th,
7), when the fluid pressure cylinder 20 is operated in the expansion/contraction direction, the portion above the central axis 21 moves up and down. Next, the first centering device 7a is moved to the eighth centering device 7a.
, 9 to explain more specifically, 31 is a fluid pressure cylinder mounted on the pedestal 3, and 32 is the fluid pressure cylinder 3.
A roller support attached to the piston rod 31a of No. 1,
33 is a rotating shaft attached to the roller support 32 via a bearing 34, 35 is a drive roller attached to the rotating shaft 33 via a key 36, 37 is a rotational drive device, 38 is a sprocket attached to the output shaft, 41 is a sprocket attached to the rotating shaft 33 via a key 40, 39 is a chain suspended between the sprockets 38 and 41, 42 is a guide rod of the roller support 32, and 43 is a support frame of the guide rod 42. When the fluid pressure cylinder 31 is operated in the expansion and contraction direction, the portion above the roller support 32 is raised and lowered, and when the rotation drive device 37 is started, the rotation is transmitted to the drive roller 35, and the rotation is transmitted to the drive roller 35. is rotated, and the petal-shaped section 4 is moved in the direction of arrow A or A2 (front-back direction) in FIG. The first centering device 7b has the same structure except that the feeding direction is different from the arrow B, , & direction (horizontal direction) in FIG. To explain the stop device 8 in detail with reference to FIG. 10, 44 is a body attached to the pedestal 3, 45 is a wedge shaft inserted into the body 44 so that it can be raised and lowered, and 46 is a spherical surface screwed onto the wedge shaft 45. A seat support, 47 is a spherical seat placed on the spherical seat support 46, 48 is a bolt for swingably attaching the spherical seat 47 to the spherical seat support 46, and 49 is an upward biasing force for the wedge shaft 45. 50 is a clamp shaft inserted into the body 44 so that it can move forward and backward, and 51 is the clamp shaft 5.
This is a screw for moving the clamp shaft 59 forward and backward.When the screw 51 is turned to move the clamp shaft 59 backward, the portion above the wedge shaft 45 is raised by the spring 49. It is designed to be carried out in accordance with the Next, the large-diameter suction device 9 will be explained in detail with reference to FIG.
is a fluid pressure cylinder attached to the same frame 52, 54 is a central shaft attached to the piston rod 53a of the same fluid pressure cylinder 53, 55 is a suction cup support shaft attached to the same central shaft 54 so as to be movable up and down, and 56 is the same support shaft 55. Rubber suction cup attached to 5
7 is a spring interposed between the suction cup 56 and the center shaft 54, and 57 is an intake pipe passed through a vacuum pump (not shown). Also, the suction cup 56
When the suction cup 56 comes into contact with the petal-shaped section 4, the air inside the suction cup 56 is sucked, and the suction cup 56 sticks to the petal-shaped section 4. Further, FIG. 12 shows the small-diameter suction device 10. As is clear from FIG. 12, the small-diameter suction device 10 has the same structure as the large-diameter suction device 9, except that the suction cup 56 has a small diameter. Next, the operation of the positioning and clamping device will be explained with reference to FIG.

First, raise the reference seat 5 and the moving support device 6 and place them on the workpiece 4 using the score line drawn on the workpiece 4 around the center of the workpiece 4 as a guide. 5 is lowered and the workpiece 4 is supported movably in the front, rear, left and right directions by the moving support device 6, and then the first and second centering devices 7a, 7b are raised and each of the centering devices 7
The drive rollers 35 of the workpieces 7a and 7b are driven to move the workpiece 4 in the front, rear, right and left directions for horizontal positioning, and then the centering devices 7a and 7b are lowered and the large-diameter suction device 9 is raised. The central part of the workpiece 4 is suctioned and held from below, and then the large-diameter suction device 9 and the moving support device 6 that are being suctioned are lowered, and the center part of the workpiece 4 is moved around the central part of the workpiece 4 by the lowered reference seat 5. The small-diameter suction device 10 is then raised to position the workpiece 4 in the height direction.
The outer periphery of the workpiece 4 is suctioned and held from below, and the burr prevention device 8 is raised to support the outer periphery of the workpiece from below.Then, the small-diameter suction device 10 that is currently suctioning is lowered to prevent the burr of the outer periphery of the workpiece 4. Press against device 8 to complete clamping. Therefore, the above-mentioned desired effect can be achieved. Although the present invention has been described above with reference to embodiments, it goes without saying that the present invention is not limited to such embodiments, and that various design modifications can be made without departing from the spirit of the present invention. .

For example, the number and position of each of the devices 5 to 10 can be changed depending on the size, shape, etc. of the workpiece, and are not limited to the above embodiments. It is also possible to position and clamp large plates, etc.

[Brief explanation of the drawing]

Fig. 1 is a front view of a device used for implementing the workpiece positioning and clamping method of the present invention, Fig. 2A is a plan view thereof, Fig. 2B is a perspective view of the workpiece, and Fig. 3A is a plan view of another example, FIG. 3B is a perspective view showing another example of the workpiece,
Fig. 4 is a longitudinal side view of the reference seat, Fig. 5 is a longitudinal side view of the moving support device, Fig. 6 is a longitudinal side view showing its function, Fig. 7 is a plan view showing its function, and Fig. 8. 9 is a longitudinal sectional side view of the first and second centering devices, FIG. 9 is a longitudinal sectional side view taken along the arrow K-K line in FIG. 8, FIG. 13 is a longitudinal sectional side view of the Oyo suction device, and FIG. 13 is an explanatory diagram of the operation of the standard layer determining and clamping device. 3... Frame, 4... Workpiece, 5... Reference seat, 6
...Movement support device, 7a...First centering device, 7b...
- Second centering device, 35...its driving roller, 8...,
Vibration prevention device, 9... Large diameter suction device, 10... Small diameter suction device. Rust" Figure 2 (A) Figure 2 old) Figure 3 [A] Figure 3 (B) Figure 4 Mackerel 5 Figure 6 Figure 7 Figure 8 Figure 9 ``0 Figure n Figure 12 Figure 13

Claims (1)

[Claims] 1. After raising the reference seat and the moving support device and placing the periphery of the center of the workpiece on these, only the reference seat is lowered to move the workpiece. The workpiece is supported so as to be movable in the front, back, left and right directions by a support device, and then the centering device is raised and the drive roller of the concentric device is driven to move the workpiece in the front, back, left and right directions to position it in the horizontal direction. The concentricity device is lowered and the large-diameter suction device is raised to suction and hold the center part of the workpiece from below.Then, the large-diameter suction device that is suctioning and the moving support device are lowered to hold the workpiece. The periphery of the center of the workpiece is pressed against the lowered reference seat to position it in the height direction, and then the small-diameter suction device is raised to suction and hold the outer periphery of the workpiece from below, and the burr prevention device is raised to remove the workpiece. Positioning of the workpiece characterized by supporting the outer circumference of the workpiece from below, then lowering the small-diameter suction device that is suctioning the workpiece, and pressing the outer circumference of the workpiece against the burr prevention device to complete clamping. Clamp method. 2. A swingable reference seat that descends to determine the height position of the workpiece, a swingable moving support device that rises to support the workpiece so that it can be moved forward, backward, left, and right; A first centering device that moves the workpiece in the front-back direction by a drive roller, a second centering device that moves up and moves the workpiece in the left-right direction by the drive roller, and a second centering device that moves up and moves the workpiece in the left-right direction by the drive roller. It has large-diameter and small-diameter suction devices that hold the workpiece by suction, and a swiveling prevention device that rises and contacts the workpiece, and the large-diameter suction device is disposed in the center of the frame, and A plurality of the moving support devices and the first and second centering devices are arranged around the same large-diameter suction device, and the small-diameter suction device and the burr prevention device are arranged around these devices. A positioning and clamping device for workpieces, characterized in that they are arranged alternately.