JPS6317013B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a new sheet processing method for easily forming a rotor-shaped molded portion on a metal plate by providing a blank with a watermark portion that spreads during processing.
This paper concerns a new application technology of openwork bulge molding method.

The latest technology is the openwork stretch forming method, which is neither stretch forming nor burring nor drawing, and is a method of forming a metal plate into a rotating body shape that does not fit into conventional classifications. Draw concentric circles, and from a point on the circumference of one circle,
Make a cut that reaches a point on the circumference of another circle that is not on the same radius as that point, or punch a long and narrow hole so that the material sandwiched between the cut or hole is point-symmetrical with respect to the center of the circle. Create a blank with many such holes, and press a punch into the blank to make a circle so that the positions on the inner and outer circles of the same cut are close to the same radius. The molding process is carried out while rotating the inner material, and is the most suitable processing method for molding rotating body shapes that require ventilation.

However, when the width of the mesh is wide, it is difficult for the mesh to undergo shear deformation, resulting in problems such as buckling of the mesh and cracking of a part of the stretched side of the mesh.
The scope of molding was limited to thick plates and narrow widths.

The present invention was made for the purpose of improving the above-mentioned defects and making it possible to apply the transparent overhang molding method even to items with a wide width. When moving in a direction closer to , the molding can be performed by bending deformation without using shear deformation.

In other words, the depth direction component of the extended shape is given as the circumferential direction component of the hole when cutting or punching, and by bending a part of the hole, the circumferential direction component is changed to the depth direction component. It is intended to be changed to In this case, bend part of the
A similar purpose can be achieved by twisting the parts. This method is based on the fact that a wide plate material has a high resistance to shear deformation, but can be deformed with very little energy when external forces such as bending and twisting are applied.

Below, the present invention will be explained with reference to an example. Fig. 1 shows a conventional watermark overhang method in which 2
A plan view is shown in which a hole 3 is made to form a hole 3, and FIG. 2 is a sectional view after the molding. In the figure, the mesh 2 is joined to the material 6 inside the inner circle at the joint 4 at one end of the mesh 2, and to the material outside the outer circle at the joint 5 at the other end. During molding, the material 6 inside the inner circle is rotated and extended so that the joints 4 and 5 at both ends come close to each other on the same radius.
It was shaped like the cross section shown in the figure.

However, when the thickness of the metal plate 1 is larger than the width of the plate 2, this type of forming is possible, but if the thickness of the metal plate 1 is thin, the plate 2 may buckle and become wavy. , I had a problem with it breaking from the inside part. FIG. 3 shows a plan view of a similar shape formed by the present invention at the time when the holes 8 are processed, and holes 9 are machined in order to leave the holes 8 in the thin blank plate 7. Yes, Mr. 8
runs in the circumferential direction between bending lines 13-15.

This blank is inserted into the material 12 inside the inner circle, the part 10 of the part 8 in contact with the material 12, the part 14 of the part 8 following it, and the inside from the bending line 15 using a rotatable punch as shown in FIG. 1
6. Holding the rotatable push-up 17, press the joint 11 of the end of the sandwich 2 to the material on the outside of the outer circle against the die 18 with the plate holder 19. part and 13 are bent, 1
The holes between 3 and 15 have a shape that stands up in the depth direction.

If necessary, the punch 16 and pusher 17 can be forcibly rotated in proportion to the amount of push. In this case, even if the board is thin, there will be no elongation throughout the board,
The molding is completed only by bending along the bending lines 13 and 15. Also, bend the diameter of the punch 16 to the line 15.
The diameter of the push-up 17 is made slightly smaller than that of the joint part 10.
If you only hold down the inside from the part and mold it in the same way, the part at the bending line 15 will not be bent, only the part at the bending line 13 will be bent, and the part 14 between the bending line 15 and the joint part 10 will be bent. It is twisted to complete the forming. In this case, if the ridge between the bending lines 13 to 15 of the lattice stands up vertically, the part 14 of the lattice will be twisted at 90 degrees between the bending line 15 and the joint 10.

The same applies when the number of holes 8 in FIG. 3 becomes large and the hole 9 becomes a mere cut line. Furthermore, a notch or the like may be provided between the joint portion 10 and the bending line 13 to facilitate bending and twisting. FIG. 5 shows a plan view at the time when the grooves of another embodiment have been processed, and in order to leave the grooves 8 in the thin metal plate 7, cuts 9 have been processed, but the grooves are formed at the bending line 13. It runs in the circumferential direction between ~15.
This blank is divided into the material 12 inside the inner circle, the joint 10 of the joint 10 that contacts said material 12, the part 14 of the joint following it, etc. from the bending line 15 to the fourth
A rotatable punch 16 whose arrangement is shown in the figure;
By sandwiching the rotatable push-up 17 and pushing it into the die 18 whose ring portion is along the bending line 13, the part of the bending line 15 of the sandwich and the bending line 13 of the sandwich are pressed.
By bending the parts, the material 12 inside the circle inside the metal plate 7 can be raised in a shape supported by the sandwich 8.

At this time, it is also possible to make cuts in the bending lines 13 and 15 to weaken them and make them easier to bend.

As described above, in the present invention, by pressing and bending a part of the slit with a die, the circumferential direction component becomes the depth direction component. It is possible to prevent buckling and waving, and it is also possible to prevent a part of the stretch side of the shank from cracking. This is a molding method that has a wide range of applications, making it possible to perform complex overhang processing.

[Brief explanation of the drawing]

Fig. 1 is a plan view of a blank processing section using the transparent overhang method that is possible when the board is thick, Fig. 2 is a cross-sectional view thereof, and Fig. 3 is a plan view of a blank processing section according to an embodiment of the present invention. , FIG. 4 is a sectional view showing the arrangement of the molds, and FIG.
The figure is a plan view of a blank processing section according to another embodiment of the present invention. 1...metal plate, 2...san, 3...hole, 4, 5...junction, 6...material inside the circle, 7...metal plate, 8...san, 9...hole or notch, 10, 11...junction ,1
2... Material inside the circle, 13...'s bending line, 14
Part of..., 15...bending line, 16...punch, 17...push up, 18...die, 19...board presser.

Claims (1)

[Claims] 1. In a method for forming an openwork overhang in the shape of a rotating body that allows ventilation and has depth on a metal plate,
Two circles with different diameters are formed concentrically on a metal plate, and cuts or holes are machined to form a plurality of holes connecting the outer circle and the inner circle among the circles, and the processing is performed by: The connection position between one end of the above-mentioned member and the material inside the above-mentioned inner circle,
The first step is to shift the connection position between the other end of the metal and the outside material in the circumferential direction so that they are not on the same radius. a second step of rotating the material inside the circle in the circumferential direction while pushing the material so that both connection positions approach the same radius, and bending the material so that the other end is raised; Characteristic openwork overhang molding method.