JPS6358672B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a positioning device that is particularly effective for accurately positioning an ultra-thin and flexible press-formed workpiece.

Ultra-thin plate workpieces such as those mentioned above can be automatically cut and cut by a fusing robot or a welding robot.
When performing processing such as welding, the workpiece is an ultra-thin plate, so if you try to fix the workpiece with a conventional clamp device, the workpiece will deform and the position will not be determined accurately. .

In view of the above-mentioned circumstances, the present invention provides a box body with an open top surface that can be positioned and held on the processing workbench of the robot, and a material that hardens over time is poured into the box body, and an ultra-thin plate workpiece is placed in the poured material. and a mold formed by immersing the lower part of the material and removing the workpiece after the material has hardened, and by simply placing the ultra-thin workpiece to be processed on the mold, it can be accurately positioned by fitting the convexes and convexes between the two. The present invention aims to provide a positioning device for an ultra-thin workpiece, with the aim of making this possible.

Hereinafter, a detailed description will be given based on the embodiments shown in the drawings.

Reference numeral 1 denotes a box body with an open top, which consists of a rectangular bottom plate 2 and four side plates 4 surrounding the bottom plate from all sides and interconnected with screws 3. Further, holes 2a for positioning are bored at two places on the lower surface of the bottom plate 2, and when the box 2 is placed on a processing workbench 6 of an industrial robot 5, which will be described later, the holes 2a and Processing workbench 6
The bottom plate 2 is positioned and held by fitting with two positioning pins 6a provided upwardly.

In order to form the mold M of the ultra-thin plate work W inside the box 1, first the box 1 is placed on a flat floor F, and a material m that hardens over time is placed inside the box 1. (For example, a hydraulic material such as plaster or cement) is poured in an appropriate amount (Figure 1).

Next, when the material m has slightly hardened, the workpiece W coated with an appropriate release agent on one desired side is immersed in the material m and left to stand (FIG. 2).

Finally, when the material m is completely hardened, the work W is released from the mold M, and a positioning device consisting of the box 1 and the mold M is completed (FIG. 3).

Therefore, in order to use the positioning device in the industrial robot 5 to perform processing operations such as welding and fusing the workpiece W, first the positioning device is placed on the processing workbench 6 so that the holes 2a and the positioning pins 6
It is accurately positioned and placed by fitting with a.
If the workpiece W to be processed is placed in alignment with the mold M, it will automatically be accurately positioned due to the concave and convex fitting between the two. Furthermore, the tip of the ground wire 7 led out from the processing workbench 6 is properly clipped to the workpiece W.
Connect to.

In this way, preparations for welding/fusing processing work are completed, and the industrial robot 5 is operated by a control device (not shown) to maintain the processing tool T in an optimal posture relative to the workpiece W, and perform automatic processing work such as welding/fusing processing. It is something.

In the above-mentioned embodiment, if the side plate 4 is considered to be an obstacle to the processing operation, apply a mold release agent to the inner surface of the side plate 4 before pouring the material m, and remove the screws 3 after forming the mold M. All you have to do is remove it and remove the four side plates 4.

Furthermore, if it is desired to strengthen the adhesive force between the bottom plate 2 and the mold M, projections or ribs may be provided at appropriate positions on the top surface of the bottom plate 2.

Furthermore, if the workpiece W has few irregularities or the depth of the recess is shallow, it is not possible to accurately position and hold the workpiece W by simply placing it on the mold M, and there is a risk that the workpiece W may shift during the machining operation. As shown in FIGS. 5 to 7, permanent magnets S may be embedded in the surface of the mold M. In this embedding method, first, a mold release agent is applied to the inner surface of the side plate 14 of the box body 10, and then the box body 10 is
Pour the hydraulic material m inside. Then, a permanent magnet S is attracted to a suitable place on the lower surface of the workpiece W, and the permanent magnet S
After applying a mold release agent to the entire lower surface of the workpiece W except for the surface of the workpiece W, the workpiece W and the permanent magnet S are appropriately submerged in the material m and left to stand (FIG. 5).

After the material m has hardened, the side plate 14 and the work W
Once removed, the permanent magnet S remains embedded in the surface of the mold M (Figure 6). Therefore, during actual machining work, if the workpiece W is placed according to the unevenness of the mold M, the workpiece W will be attracted and stabilized by the permanent magnet S, and it will not shift during the machining work (Fig. 7). ).

It is also possible to embed an appropriate number of vacuum suction devices such as rubber cups in appropriate positions in the mold M, and to hold the workpiece W using vacuum force.

In addition, in the above-mentioned embodiment, in order to ground the workpiece W, the grounding wire 7 was led out from the processing workbench 6 and connected to the workpiece W with a clip 7a, but when the workpiece W was positioned in the mold M, a part of the workpiece W If the mold M is molded so as to be in contact with the upper edge of the side plate 4, the ground wire 7 described above is not required. Alternatively, the ground wire A may be embedded in the mold M as shown by the two-dot chain line in FIG.

That is, the ground A consists of a compression spring A ₁ whose lower end is fixed to the conductive bottom plate 2 and a conductor A ₂ which is fixed to the upper end of the compression spring A ₁ . Below the liquid level conductor A ₂ ,
The workpiece W may be brought into contact with the conductor _A2 and pressed against the spring force.

Furthermore, in the above-mentioned embodiment, in the case of a workpiece to be subjected to fusing processing, when forming the mold M, the lower part of the fusing part of the workpiece W is appropriately separated from the mold M to provide a space for gas blow-through.

As detailed above, according to the present invention, the positioning device consisting of a box body and a mold molded inside the box body is positioned and placed on the processing workbench, and the workpiece is placed accurately according to the unevenness of the mold. Since the machine can be positioned and held, it is highly effective in automatic processing of ultra-thin plate workpieces, such as the body of a passenger car, for example.

[Brief explanation of drawings]

The figures all show embodiments of the present invention: Figure 1 is a perspective view of the box, Figures 2 and 3 are explanatory diagrams of molding, and Figure 4 is processing work when using the positioning device of the present invention. Explanatory diagrams showing the situation, FIGS. 5 to 7 are explanatory diagrams showing another embodiment in which permanent magnets are embedded. In the figure, 1 is a box, 2 is a bottom plate, 4 is a side plate, 5 is an industrial robot, 6 is a processing table, m is a material, M is a mold, and W is a workpiece.

Claims (1)

[Claims] 1. A box with an open top that can be positioned and held on a processing workbench as appropriate; a material that hardens over time is poured into the box, and the lower part of the ultra-thin workpiece is immersed in the poured material. and a mold formed by removing the ultra-thin plate work after the material has hardened. 2. The positioning device for an ultra-thin plate work according to claim 1, wherein the material is a hydraulic material such as plaster or cement. 3 Claim 1 in which the material is resin
A positioning device for an ultra-thin workpiece as described in Section 1. 4. The ultra-thin workpiece positioning device according to claim 1, wherein the box body has a positioning hole or protrusion on the bottom surface of the bottom plate. 5. The ultra-thin workpiece positioning device according to claim 1, wherein the box body has a side plate that can be disassembled. 6. The ultra-thin workpiece positioning device according to claim 1, wherein the box body has a mold release agent applied to the inner surface except for the bottom plate. 7. The ultra-thin workpiece positioning device according to claim 1, wherein the box body has an appropriate number of protrusions or ribs protruding from the upper surface of the bottom plate. 8. The ultra-thin plate work positioning device according to claim 1, wherein a permanent magnet is embedded in the surface of the mold. 9. The ultra-thin plate work positioning device according to claim 1, wherein a conductor that is electrically connected to the bottom is embedded in the surface of the mold.