JP2019098379A - Forming device - Google Patents

Abstract

To provide a forming device which can perform pressing to a formed material with high accuracy.SOLUTION: A forming device 1 includes: an electromagnetic coil 2; a fluid 10 having conductivity and installed along a plate-like material 50 on one surface side of the plate-like material 50; and a die 4 which is installed on the other surface side of the plate-like material 50 and formed so as to provide a formed shape to the plate-like material 50. The forming device 1 causes an electromagnetic force generated by the electromagnetic coil 2 to act on the fluid 10 and the fluid 10 presses the plate-like material 50 to the die 4.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a molding apparatus.

  There are a wide variety of aircraft parts that make up an aircraft, and in order to obtain a desired shape by press-forming a plate made of an aluminum alloy, it is necessary to prepare many kinds of forming dies. A method of placing a material to be molded on a male mold and pressing the material to be molded by a rubber bag pressurized with a liquid such as oil instead of a female mold as one method of press molding There is (Verson press molding). In the case of verson press molding, it is sufficient to prepare only a male mold as a mold, and is suitable for high-mix low-volume production of aircraft parts and the like.

  On the other hand, there is also known a technique for forming a material to be formed using an electromagnetic forming apparatus instead of the Burson press forming. In electromagnetic forming, an induced current is generated on the surface of a molding material disposed along an electromagnetic coil by supplying a large current instantaneously to the electromagnetic coil. As a result, an electromagnetic force acts on the surface of the material to be molded, and the material to be molded moves in the direction of the molding die and is pressed against the molding die.

  Patent Document 1 below describes that a thin plate is formed into a desired shape by an electromagnetic forming apparatus, and Patent Document 2 applies electromagnetic force to a predetermined portion of a hollow material in multiple stages by an electromagnetic plastic working method. It is described that it carries out shaping processing.

JP 2007-296553 A JP-A-6-23442

  In the above-described barson press molding, the bag pressurized by the liquid presses the material to be molded through the rubber plate, so the force does not spread over the entire material to be molded, the amount of molding is insufficient, and the shape accuracy is not high. . As a result, the product formed by molding may have a shape defect or a shape correction operation may be required. There is a problem that the shape correction work is time-consuming and time-consuming because it is performed by multiple moldings, manual processing, and the like. Further, depending on the forming shape, for example, when forming a flange having a convex curved surface on the outer side (compression flange), a compressive force acts on the material to be formed during press forming, which may cause unnecessary wrinkles.

  This invention is made in view of such a situation, Comprising: It aims at providing the shaping | molding apparatus which can press-mold precisely with respect to a to-be-shaped material.

In order to solve the above-mentioned subject, the molding device of the present invention adopts the following means.
That is, the molding apparatus according to the present invention includes an electromagnetic coil, a conductive material, and a fluid disposed along the material to be molded on one surface of the material to be molded, and disposed on the other surface of the material to be molded And a mold configured to impart a molding shape to the material to be molded, and an electromagnetic force generated by the electromagnetic coil is applied to the fluid to cause the fluid to form the material to be molded Press against the mold.

  According to this configuration, the fluid having conductivity is installed on the one surface side of the molding material along the molding material, and the molding die is installed on the other surface side of the molding material. When a current is instantaneously applied to the electromagnetic coil, an induced current is generated in the fluid having conductivity, and an electromagnetic force acts on the fluid. Then, the fluid moves in the direction of the mold, and the fluid presses the material to be molded onto the mold. Thereby, the molding shape is given to the material to be molded by the molding die. By generating an electromagnetic force in the fluid, a large pressing force can be generated in a short time by only the fluid pressure of the fluid, as compared with the case where the material to be molded is pressed to the mold. The material to be molded is molded at a high pressing speed with a high pressing force by using an electromagnetic force, which enables high-precision molding and reduces the amount of springback. As a result, distortion correction work after molding can also be reduced.

  In the above invention, the fluid may be a metal powder, a liquid in which the metal powder is dispersed, or a liquefied metal.

  In the above invention, the fluid may be accommodated in the bag-like member.

  According to the present invention, press molding can be performed on a material to be molded with high accuracy.

It is a longitudinal section showing a molding device concerning one embodiment of the present invention. It is a longitudinal section showing a molding device concerning one embodiment of the present invention.

Below, the shaping | molding apparatus 1 which concerns on one Embodiment of this invention is demonstrated with reference to FIG.1 and FIG.2.
The forming apparatus 1 according to the present embodiment is an apparatus that applies a forming shape to a plate-like material 50 that is a to-be-formed material made of, for example, an aluminum alloy, using the forming die 4. The forming member 60 formed by the forming apparatus 1 is used for an aircraft part or the like.

  As shown in FIG. 1, the molding apparatus 1 according to the present embodiment includes an electromagnetic coil 2, a power supply unit 3 that supplies a current to the electromagnetic coil 2, a molding die 4, and the like. The forming apparatus 1 generates an induced current to the conductive material by the electromagnetic coil 2 to exert an electromagnetic force, similarly to generally known electromagnetic forming. The operating conditions and the like of the molding apparatus 1 can be set in the same manner as electromagnetic molding that is normally performed.

  The electromagnetic coil 2 is disposed outside the molding surface of the mold 4. For example, the electromagnetic coil 2 is disposed along the surface of the mold 4 as shown in FIG. The electromagnetic coil 2 may have, for example, a cylindrical shape, and the mold 4 may be disposed inside the electromagnetic coil 2.

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

  The fluid 10 is a conductive and fluid material. The fluid 10 is accommodated in, for example, a rubber bag 11. The fluid 10 is, for example, a metal powder or a liquid in which the metal powder is dispersed. The metal powder is, for example, iron powder. The liquid is, for example, oil, and fluidity and corrosion resistance are ensured. In the liquid in which the metal powder is dispersed, the proportion of the metal powder in the liquid is desirably 50% by mass or more, and preferably 75% by mass or more. However, although there is a possibility that the load pressure at the time of molding may be reduced, even if the value is smaller than the above-described example, it is applicable as the fluid 10 as long as it can be molded by the material. Also, the fluid 10 may be a low melting point metal. The low melting point metal is, for example, lead, tin or the like. By setting the environment of the forming apparatus 1 to an environment equal to or higher than the melting point of the fluid 10 which is a low melting point metal, the fluid 10 can be used in a fluid liquefied state.

  The fluid 10 is placed on one side of the plate-like material 50 which is a material to be molded, and the mold 4 is installed on the other side of the plate-like material 50 with the plate-like material 50 interposed therebetween.

  By supplying a large current instantaneously to the electromagnetic coil 2, an induced current is generated on the surface of the fluid 10 disposed along the electromagnetic coil 2. As a result, an electromagnetic force acts on the fluid 10, the fluid 10 moves in the direction of the mold 4, and the fluid 10 and the plate-like material 50 are pressed against the mold 4.

  Before molding, the plate-like material 50 which is a material to be molded is placed on the molding surface of the mold 4. The mold 4 is a male mold and imparts a molding shape to the plate-like material 50.

  In the molding method using the molding apparatus 1 according to the present embodiment, first, as shown in FIG. 1, the plate-like material 50 is placed on the molding surface of the molding die 4. Then, the fluid 10 is further placed on the upper surface of the plate-like material 50 placed on the mold 4.

  Next, current is supplied to the electromagnetic coil 2. As a result, an induced current is generated on the surface of the fluid 10 and an electromagnetic force acts on the fluid 10, so that the fluid 10 moves in the direction of the mold 4 and the fluid 10 presses the plate material 50 against the mold 4. At this time, the flowability of the fluid 10 decreases, and the fluid 10 can firmly press the plate-like material 50. Thereby, as shown in FIG. 2, the plate-like material 50 is formed along the forming die 4 to form the forming member 60. After pressing the plate-like material 50 for a predetermined time, the action of the electromagnetic force in the fluid 10 can be stopped by interrupting the supply of the current. Also, the flowability of the fluid 10 is restored thereby.

  As described above, according to the molding apparatus 1 according to the present embodiment, the electromagnetic force is generated in the fluid 10 to make the plate 10 larger than the conventional barson press molding in which the plate material is pressed against the molding die only by the fluid pressure of the fluid. The pressing force can be generated in a short time.

  That is, since the plate-like material 50 is formed at a high pressing force and high speed by utilizing the electromagnetic force acting on the fluid 10, it becomes possible to perform the forming with high accuracy in the shape along the forming die 4 The amount of spring back is reduced in the formed member 60. In particular, in the case of an aluminum alloy, the material is such a material that the breaking elongation becomes high as the strain rate becomes high, and by forming at a high speed, the reduction effect of the amount of spring back is large. Therefore, since it is hard to produce lack of shaping | molding amount of the shaping | molding member 60, the distortion correction operation after shaping | molding can also be reduced. In addition, since the molding can be performed with high accuracy, the molding member 60 can be formed without generating unnecessary wrinkles even in the case of molding a flange (a compression flange) having a convex curved surface on the outside. In addition to the aluminum alloy, a magnesium alloy (such as AZ80) is known as a material whose breaking elongation becomes higher as the strain rate becomes faster, and the effect of reducing the amount of springback can be obtained.

  In the above-mentioned embodiment, although a case where forming member 60 was formed for the first time from uncut sheet material 50 was explained, the present invention is not limited to this example. For example, the present invention can be applied to the case where the molding die 4 is pressed against the molding member 60 already processed and the shape correction is performed on the molding member 60.

1: molding apparatus 2: electromagnetic coil 3: power supply 4: mold 5: power circuit 6: capacitor 7: switch 8: electric resistance 10: fluid 11: bag 50: plate material 60: molded member

Claims (3)

Electromagnetic coil,
A fluid having conductivity and disposed along the molding material on one side of the molding material;
A molding die disposed on the other surface side of the material to be molded and formed to give a molding shape to the material to be molded;
Equipped with
A forming apparatus, wherein an electromagnetic force generated by the electromagnetic coil acts on the fluid, and the fluid presses the material to be molded against the mold.   The forming apparatus according to claim 1, wherein the fluid is a metal powder, a liquid in which the metal powder is dispersed, or a liquefied metal. The forming apparatus according to claim 1, wherein the fluid is contained in a bag-like member.

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