JP6918678B2 - Electromagnetic molding equipment - Google Patents

Description

The present invention relates to an electromagnetic molding apparatus.

Aircraft parts such as the fuselage and main wings of an aircraft are constructed by combining structural members such as a plate-shaped skin, a long frame, and a stringer. The elongated structural member (long member) is a mold material and has a cross-sectional shape of, for example, a Z shape. As shown in FIG. 16B, some of the elongated members have a plurality of steps (joggles) in which the plate thickness changes for each portion along the longitudinal direction. The elongated member 60 shown in FIG. 16B has a thick plate portion 61 and a thin plate portion 62.

When a long member having a bent cross-sectional shape such as a Z shape is manufactured, roll molding is performed on a flat plate-shaped long material 50 having no bending as shown in FIG. 16 (A). In the roll forming apparatus for performing roll forming, a plurality of sets of two rolls sandwiching a long member are installed along the line. By sequentially passing a long material from one end side to the other end side of a line in which a plurality of sets of rolls are installed, a flat cross-sectional shape is gradually formed into a cross-sectional shape required as a product. do. By stepwise molding with a plurality of sets of rolls in this way, it is possible to prevent the occurrence of defects such as cracks due to a sudden change in cross-sectional shape.

Japanese Unexamined Patent Publication No. 2007-296553 Japanese Unexamined Patent Publication No. 6-23442

However, when a long material is molded by the roll molding described above, distortion and residual stress are generated in the molded long member due to wear of the roll and subtle changes in the pressure mechanism that applies pressure to the roll, resulting in twisting. Shape defects such as warp (horizontal warp, vertical warp) and waviness occur. In addition, the strain and residual stress generated for each material differ depending on the degree of wear and the change in applied pressure, and the shape may change in various ways such as twisting, warping, or waviness.

Further, in the roll forming apparatus, when changing the cross-sectional shape to be obtained after molding, it is necessary to replace the roll according to the shape, and in the initial stage after the replacement, the above-mentioned shape defect is likely to occur, and the roll or pressure. It is necessary to adjust the mechanism.

Furthermore, in the case of a long member having a plurality of steps formed in the longitudinal direction, the way of hitting the roll differs between the thick plate portion and the thin plate portion. Therefore, the bending angle may not be a predetermined angle for each part. Further, in roll forming, since the elongated member passes between the two rolls arranged one above the other, the one side is left as a stepped surface and the other side is left as a flat surface as shown in FIG. 17 (A). It is difficult, and as shown in FIG. 17B, a stepped surface is also formed on the other surface side. As a result, when an elongated member having a plurality of steps formed is combined with another member and assembled as an aircraft part, a gap is generated between the elongated member and the other member.

On the other hand, a technique of molding a material to be molded by using an electromagnetic molding device instead of a roll molding device is known, but molding is performed so that a long material has a bent cross-sectional shape such as a Z shape. Further, it is not known that molding is performed on a long member having a plurality of steps formed therein. In addition, the above-mentioned Patent Document 1 describes that a thin plate is formed into a desired shape by an electromagnetic molding apparatus, and Patent Document 2 describes that an electromagnetic force is applied to a predetermined portion of a hollow material in multiple stages by an electromagnetic plastic working method. It is described that the molding process is performed by applying the mixture.

The present invention has been made in view of such circumstances, and provides an electromagnetic molding apparatus capable of suppressing the occurrence of shape defects and enabling highly accurate molding in the molding of long members. The purpose.

In order to solve the above problems, the electromagnetic molding apparatus of the present invention employs the following means.
That is, the electromagnetic molding apparatus according to one aspect of the present invention includes an electromagnetic coil and a molding die that is installed along the electromagnetic coil and imparts a molding shape to a material to be molded having a long shape. An electromagnetic molding apparatus in which an electromagnetic force generated by an electromagnetic coil is applied to a material to be molded to press the material to be molded against the molding die, and the molding die is formed along the longitudinal direction of the material to be molded. The molding mold has a different cross-sectional shape from one end side to the other end side, and the molding material gradually moves into a desired shape by moving the molding material in parallel with the longitudinal direction. It is formed to change to.

According to this configuration, the electromagnetic force generated by the electromagnetic coil acts on the material to be molded having a long shape, and the molding die imparts a molding shape to the material to be molded. The molding die has different cross-sectional shapes from one end side to the other end side along the longitudinal direction of the material to be molded, and the material to be molded moves parallel to the longitudinal direction, so that the material to be molded is desired. It is formed so as to gradually change to the shape of. As a result, the material to be molded is moved in parallel with respect to the longitudinal direction, and the electromagnetic force is repeatedly applied to the material to be molded, so that the material to be molded is pressed against the molding die and deformed into a desired shape. It changes gradually to.

In the above aspect, the electromagnetic coil may be formed continuously along the molding die.

In the above aspect, a plurality of the electromagnetic coils may be installed, and the plurality of electromagnetic coils may be shorter than the material to be molded and may be installed along the longitudinal direction of the material to be molded.

In the above aspect, a plurality of the molding dies may be installed, and each of the plurality of molding dies may be shorter than the material to be molded and may be installed along the longitudinal direction of the material to be molded.

In the above aspect, the plurality of molding dies may have an inclined surface formed at an end portion.

In the above aspect, the plurality of molding dies may be formed so as to impart a concave shape or a convex shape in the longitudinal direction in the material to be molded.

According to the present invention, in the molding of a long member, it is possible to suppress the occurrence of shape defects and enable highly accurate molding.

It is a schematic block diagram which shows the electromagnetic molding apparatus which concerns on 1st Embodiment of this invention. It is a schematic block diagram which shows the modification of the electromagnetic coil of the electromagnetic molding apparatus which concerns on 1st Embodiment of this invention. It is a perspective view which shows the molding die of the electromagnetic molding apparatus which concerns on 1st Embodiment of this invention. It is a top view which shows the molding mold of the electromagnetic molding apparatus which concerns on 1st Embodiment of this invention. It is a front view which shows the molding die of the electromagnetic molding apparatus which concerns on 1st Embodiment of this invention. It is a top view which shows the molding mold of the electromagnetic molding apparatus which concerns on 1st Embodiment of this invention. It is a front view which shows the molding die of the electromagnetic molding apparatus which concerns on 1st Embodiment of this invention. It is a top view which shows the molding mold of the electromagnetic molding apparatus which concerns on 1st Embodiment of this invention. It is a front view which shows the molding die of the electromagnetic molding apparatus which concerns on 1st Embodiment of this invention. It is a vertical cross-sectional view which shows the molding mold of the electromagnetic molding apparatus which concerns on 1st Embodiment of this invention, and is the X-ray arrow view of FIG. It is a vertical cross-sectional view which shows the molding mold of the electromagnetic molding apparatus which concerns on 1st Embodiment of this invention, and is the XI-XI line arrow view of FIG. It is a vertical cross-sectional view which shows the molding mold of the electromagnetic molding apparatus which concerns on 1st Embodiment of this invention, and is the XII-XII line arrow view of FIG. It is a perspective view which shows the molding die of the electromagnetic molding apparatus which concerns on 2nd Embodiment of this invention. It is a top view which shows the molding mold of the electromagnetic molding apparatus which concerns on 2nd Embodiment of this invention. It is a front view which shows the molding die of the electromagnetic molding apparatus which concerns on 2nd Embodiment of this invention. 16 (A) is a perspective view showing an elongated material, and FIG. 16 (B) is a perspective view showing an elongated member. 17 (A) and 17 (B) are a perspective view and a partial side view showing a long member, respectively.

Hereinafter, embodiments according to the present invention will be described with reference to the drawings.
[First Embodiment]
Hereinafter, the first embodiment of the present invention will be described with reference to FIGS. 1 to 12.
The electromagnetic molding apparatus 1 according to the present embodiment uses a molding die 4 for a long material 50, which is a material to be molded, for example, made of an aluminum alloy, as shown in FIG. It is a device that imparts a cross-sectional shape such as. The elongated member 60 formed by the electromagnetic molding apparatus 1 as shown in FIG. 16B is used as a structural member such as a frame and a stringer constituting aircraft parts such as an aircraft fuselage and main wings.

As shown in FIG. 1, the electromagnetic molding apparatus 1 according to the present embodiment includes an electromagnetic coil 2, a power supply unit 3 for supplying an electric current to the electromagnetic coil 2, a molding die 4, and the like.

The electromagnetic coil 2 is continuously formed along the molding die 4. As shown in FIG. 1, the electromagnetic coil 2 may have, for example, a cylindrical shape and may have a circular cross section, or as shown in FIG. 2, the electromagnetic coil 2 may be arranged along the surface of the molding die 4. good.

A large current is supplied to the electromagnetic coil 2 from the power supply unit 3. In the power supply circuit 5, for example, as shown in FIG. 1, a capacitor 6 is installed in parallel with the electromagnetic coil 2, and a switch 7 is installed between the connection point of the power supply unit 3 and the capacitor 6 and the electromagnetic coil 2. Consists of. In this configuration, when the switch 7 is open, the capacitor 6 is charged from the power supply unit 3 via the electric resistance 8. Then, by closing the switch 7 and discharging the electric charge charged in the capacitor 6, a large current is generated in the electromagnetic coil 2.

By instantly passing a large current through the electromagnetic coil 2, an induced current is generated on the surface of the elongated material 50 arranged along the electromagnetic coil 2. As a result, an electromagnetic force acts on the surface of the elongated material 50, and the elongated material 50 moves in the direction of the molding die 4 and is pressed against the molding die 4.

The molding die 4 is installed along the longitudinal direction of the elongated material which is the material to be molded. The molding die 4 imparts a molding shape to the elongated material. In order to prevent the occurrence of defects such as cracks due to a sudden change in cross-sectional shape, the molding die 4 has one end 4a side to the other end 4b along the longitudinal direction of the elongated material 50 as shown in FIGS. 3 to 5. It has a different cross-sectional shape towards the side. That is, as shown in FIGS. 4 to 9, the elongated material 50 is formed so as to gradually change into a desired shape by moving the elongated material 50 in parallel with respect to the longitudinal direction. There is.

The electromagnetic coil 2 and the molding die 4 have, for example, substantially the same length as the elongated material 50. The electromagnetic coil 2 is not limited to the case where only one electromagnetic coil 2 is continuously formed in the longitudinal direction, and may be divided into a plurality of electromagnetic coils 2 in the longitudinal direction. In this case, the plurality of electromagnetic coils 2 are provided apart from each other.

A molding method of the elongated member 60 (see FIG. 16B) after molding will be described with reference to FIGS. 3 and 10 to 12. The elongated member 60 has horizontal flange portions 63 and 64 and a web portion 65 having an angle of 90 ° with respect to the flange portions 63 and 64.
As shown in FIG. 3, the shape of the molding surface 9a on the one end 4a side in the molding die 4 is a horizontal flat plate surface. The molding surface 9b for molding the web portion 65 of the molding surface 9 of the molding mold 4 has the same width from one end 4a side to the other end 4b side, and the inclination angle remains horizontal and constant. The molding surfaces 9c and 9d for molding the flange portions 63 and 64 have the same width from one end 4a side to the other end 4b side, and the inclination angle gradually inclines from horizontal to vertical.

In the electromagnetic molding method using the electromagnetic molding apparatus 1 according to the present embodiment, first, as shown in FIGS. 4 and 5, only one end 50a side of the flat plate-shaped elongated material 50 is placed on the one end 4a side of the molding die 4. Install in. Then, an electric current is supplied to the electromagnetic coil 2 to press the elongated material 50 against the molding die 4. As a result, as shown in FIGS. 4 and 5, one end 50a of the flat plate-shaped elongated material 50 is molded along the molding die 4.

After that, as shown in FIGS. 6 and 7, the elongated material 50 is shifted to the other end side by a predetermined distance along the longitudinal direction. Then, an electric current is supplied to the electromagnetic coil 2 to press the elongated material 50 against the molding die 4. As a result, the flat plate-shaped elongated material 50 that has entered the range of the electromagnetic coil 2 due to being displaced in the longitudinal direction, and one end 50a side of the elongated material 50 previously formed along the molding die 4 are separated. It is molded along the molding die 4.

By repeating the above procedure, the elongated material 50 is gradually deformed into the final shape from the one end 50a side to the other end 50b side. The elongated material 50 that has passed through the other end 4b side of the molding die 4 has a final shape obtained by electromagnetic molding, and the elongated material 50 is until the other end 50b of the elongated material 50 is completely passed. And the molding by supplying the current to the electromagnetic coil 2 are repeated. When the other end 50b of the elongated material 50 has passed, the elongated member 60 having the final shape obtained by electromagnetic molding is formed over all the longitudinal directions of the target elongated material 50 (FIG. 16 (B). )reference).

As described above, according to the electromagnetic molding using the electromagnetic molding apparatus 1 according to the present embodiment, the wear of the mold is less than that of the roll molding, and the compression mechanism is not provided like the roll molding apparatus. No subtle changes occur. Therefore, the long member 60 formed by electromagnetic molding is less likely to have a shape defect. Further, since the molding die 4 has a continuous shape in the longitudinal direction, the setup time such as roll clearance adjustment in the roll molding apparatus can be reduced.

Furthermore, since molding is performed at a high speed using electromagnetic force, the amount of springback is reduced, molding with high accuracy is possible, and strain correction work after molding can be reduced.

[Second Embodiment]
Next, the second embodiment of the present invention will be described with reference to FIGS. 13 to 15.
In the first embodiment, the case where the molding die 4 having a continuous shape in the longitudinal direction is used has been described, but the present invention is not limited to this example.

The molding die 4 according to the second embodiment of the present invention is divided into a plurality of molding dies in the longitudinal direction, and the divided dies 10A, 10B, and 10C are arranged apart from each other. As a result, the cost can be reduced as compared with the case of using the molding die 4 having a continuous shape in the longitudinal direction.

The electromagnetic coil 2 is divided into positions corresponding to the divided dies 10A, 10B, and 10C, and is separated from each other. In the example shown in FIG. 13, the number of divisions of the molding die 4 and the electromagnetic coil 2 is 3 divisions, but may be 2 divisions or 4 divisions or more.

The molding surface 11 of the split dies 10A, 10B, 10C includes a molding surface 11a for molding the web portion 65, a molding surface 11b for molding the flange portion 63, and a molding surface 11c for molding the flange portion 64. Have. In each of the divided dies 10A, 10B, 10C, the molding surfaces 11a, 11b, 11c have the same width from one end side to the other end side. The present invention is not limited to this example, and the molding surfaces 11b and 11c may be inclined from the horizontal side to the vertical side gradually from the one end side to the other end side as in the first embodiment. good.

The end of the molding surface 11a for forming the web portion 65 in each of the divided dies 10A, 10B, 10C may be formed with a tapered surface 11d inclined toward the adjacent divided dies 10A, 10B, 10C. .. As a result, the long material 50 can be smoothly moved without being caught by the long material 50.

Also in the present embodiment, as in the first embodiment, an electric current is supplied to the electromagnetic coil 2, the elongated material 50 is pressed against the molding die 4, and then the elongated material 50 is pushed along the longitudinal direction by a predetermined distance. The procedure of shifting to the other end side is repeated. 14 and 15 show an example of the arrangement relationship between the elongated material 50 being molded and the split dies 10A, 10B, and 10C. Then, the elongated material 50 is gradually deformed into the final shape from one end 50a side to the other end 50b side.

The elongated material 50 to be molded in the present embodiment may have a uniform wall thickness in the longitudinal direction, or as shown in FIG. 16A, the plate thickness varies from portion to portion along the longitudinal direction. A plurality of steps (joggles) may be formed. In this case, when molding the long material 50 by electromagnetic molding, the molding surfaces 11a, 11b, 11c of the divided dies 10A, 10B, 10C are formed so that a plurality of steps are formed in the longitudinal direction. May have a concave shape or a convex shape formed corresponding to the shape of a plurality of steps. As a result, the electromagnetic molding apparatus 1 not only imparts a cross-sectional shape such as a Z shape, but also simultaneously forms a plurality of steps in the longitudinal direction. Therefore, the molding process can be reduced, and the cost can be reduced.

In the case of the present embodiment, the cost for manufacturing the molding die 4 can be reduced as compared with the first embodiment using the molding die 4 having a continuous shape in the longitudinal direction. Further, as in the first embodiment, the mold is less worn as compared with the roll molding, and the compression mechanism is not provided as in the roll molding apparatus, so that the compression mechanism does not change subtly during molding. Therefore, the long member 60 formed by electromagnetic molding is less likely to have a shape defect. In addition, since molding is performed at a high speed using electromagnetic force, the amount of springback is reduced, molding with high accuracy is possible, and strain correction work after molding can be reduced.

1: Electromagnetic molding device 2: Electromagnetic coil 3: Power supply unit 4: Molding mold 5: Power supply circuit 6: Capacitor 7: Switch 8: Electric resistance 9: Molding surface 9a, 9b, 9c, 9d: Molding surface 10A, 10B, 10C : Divided mold 11: Molded surface 11a, 11b, 11c: Molded surface 11d: Tapered surface 50, 60: Long material 61: Thick plate part 62: Thin plate part 63, 64: Flange part 65: Web part

Claims (6)

With an electromagnetic coil
A molding die that is installed along the electromagnetic coil and imparts a molding shape having a web portion and a flange portion at a predetermined angle to the web portion with respect to a material to be molded having a long shape.
With
An electromagnetic molding apparatus that applies an electromagnetic force generated by the electromagnetic coil to the material to be molded and presses the material to be molded against the molding mold.
The molding die has a different cross-sectional shape from one end side to the other end side along the longitudinal direction of the material to be molded.
The molding die is formed so that the material to be molded is gradually changed into a desired shape by moving the material to be molded in parallel with the longitudinal direction .
In the molding die, the shape of the first molding surface on one end side is a horizontal flat plate surface.
Of the molding surfaces of the molding mold, the second molding surface for molding the web portion has the same width from one end side to the other end side, and the inclination angle remains horizontal and constant.
Of the molding surfaces of the molding mold, the third molding surface for molding the flange portion has the same width from the one end side to the other end side, and the inclination angle gradually increases from horizontal to horizontal. An electromagnetic molding device that is tilted so that it becomes. The electromagnetic molding apparatus according to claim 1, wherein the electromagnetic coil is continuously formed along the molding mold. The electromagnetic molding apparatus according to claim 1, wherein a plurality of the electromagnetic coils are installed, and each of the plurality of electromagnetic coils is shorter than the material to be molded and is installed along the longitudinal direction of the material to be molded. The electromagnetic molding apparatus according to claim 1, wherein a plurality of the molding dies are installed, and each of the plurality of molding dies is shorter than the material to be molded and is installed along the longitudinal direction of the material to be molded. The electromagnetic molding apparatus according to claim 4, wherein the plurality of molding dies have an inclined surface formed at an end portion. The electromagnetic molding apparatus according to claim 4 or 5, wherein the plurality of molding dies are formed so as to impart a concave shape or a convex shape in the longitudinal direction to the material to be molded.

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