JP2020157353A - Electromagnetic molding method and electromagnetic molding apparatus - Google Patents

Abstract

To provide an electromagnetic molding method capable of performing joining or shape addition to a material with low conductivity.SOLUTION: By applying a current 40 to a first fixing member 14, electromagnetic force (thrust) 46 from the first fixing member toward a second fixing member 34 is induced in a conductive member 24 based on a principle of electromagnetic induction, and a first member 36 to be molded is allowed to collide with a second member 38 to be molded by the electro-magnetic force, to thereby join the first member to be molded to the second member to be molded.SELECTED DRAWING: Figure 1

Description

The present invention relates to an electromagnetic molding method and an electromagnetic molding apparatus.

The electromagnetic molding method is one of plastic working methods in which the conductive material is deformed by applying the energy of a magnetic field to the conductive material. According to this electromagnetic molding method, for example, by momentarily applying a high electromagnetic force to a conductive material, the conductive material can collide with another member to join the conductive material to another member. it can.

Specifically, in Patent Document 1, a one-turn coil in which a narrow and long conductor plate is formed in a U shape is used, and a thin metal plate is laminated between the upper plate and the lower plate of the one-turn coil. A large current is instantaneously passed through this one-turn coil, and an eddy current is generated in the stacked metal thin plates by using the law of electromagnetic induction, and the stacked metal thin plates are arranged. A method of joining is proposed.

Patent No. 3751153

On the other hand, it is difficult to induce an electromagnetic force on a material having low conductivity, so that the conventional electromagnetic molding method cannot be applied. Therefore, when joining materials with low conductivity, a method such as welding is used.

However, welding requires a large amount of electric power (energy) when joining materials. In addition, processing other than joining, for example, mold molding also requires a large amount of energy. As the energy required for processing increases, the processing cost increases, and a large investment is required to prepare equipment that generates a large amount of energy. In order to reduce the processing cost, it is generally preferable to select a construction method that consumes less energy. On the other hand, in the electromagnetic molding method, energy is consumed only when an electric current is instantaneously passed. Therefore, the electromagnetic molding method is an economical processing method that consumes less energy required for molding. If the electromagnetic molding method can be applied to a material having low conductivity, the applicable range of the economical electromagnetic molding method can be expanded.

Therefore, the present invention proposes a new processing method that consumes less energy by utilizing the above-mentioned advantages of the electromagnetic molding method. For example, an electromagnetic molding method that joins or imparts a shape to a material having low conductivity. And to provide an electromagnetic molding apparatus.

In order to achieve this object, the electromagnetic molding method according to claim 1 is
The first fixing member and the second fixing member are arranged so as to face each other.
The conductive member, the first molded member, and the second molded member are arranged in order from the first fixing member to the second fixing member.
By applying an electric current to the first fixing member, an electromagnetic force (thrust) from the first fixing member toward the second fixing member is induced in the conductive member based on the principle of electromagnetic induction, and the electromagnetic force is induced. The first member to be molded is made to collide with the second member to be molded, and the first member to be molded is joined to the second member to be molded.

The electromagnetic molding method according to claim 2 is
The first fixing member and the second fixing member are arranged so as to face each other.
The conductive member and the member to be molded are arranged in order from the first fixing member toward the second fixing member.
By applying an electric current to the first fixing member, an electromagnetic force (thrust) from the first fixing member toward the second fixing member is induced in the conductive member based on the principle of electromagnetic induction, and the electromagnetic force is induced. By urging the conductive member, the member to be molded is made to collide with the second fixing member to give the member to be molded a predetermined shape.
The surface of the conductive member facing the member to be molded and the surface of the second fixing member facing the member to be molded are provided with a processed shape corresponding to the predetermined shape.
It is characterized in that the processed shapes of the conductive member and the second fixing member are each applied to the member to be molded at the time of the collision to form the predetermined shape.

The electromagnetic molding apparatus according to claim 3 is
With the conductive first fixing member,
A second fixing member arranged to face the first fixing member,
A conductive member arranged between the first fixing member and the second fixing member,
It is connected to the first fixing member and includes a charge / discharge circuit that applies a pulse current to the first fixing member.
The charging is performed in a state where the first member to be molded and the second member to be molded are arranged in order from the conductive member toward the second fixing member between the conductive member and the second fixing member. By applying the pulse current from the discharge circuit to the first fixing member, an electromagnetic force (thrust) from the first fixing member to the second fixing member is induced in the conductive member based on the principle of electromagnetic induction. Then, the first member to be molded is made to collide with the second member to be molded by the electromagnetic force, and the first member to be molded is joined to the second member to be molded.

The electromagnetic molding apparatus according to claim 4 is
With the conductive first fixing member,
A second fixing member arranged to face the first fixing member,
A conductive member arranged between the first fixing member and the second fixing member,
It is connected to the first fixing member and includes a charge / discharge circuit that applies a pulse current to the first fixing member.
Based on the principle of electromagnetic induction, by applying the pulse current from the charge / discharge circuit to the first fixed member in a state where the member to be molded is arranged between the conductive member and the second fixed member. An electromagnetic force (thrust) from the first fixing member toward the second fixing member is induced in the conductive member, and the conductive member is urged by the electromagnetic force to make the member to be molded the second member. It is configured to collide with a fixed member to give a predetermined shape to the member to be molded.
The surface of the conductive member facing the member to be molded and the surface of the second fixing member facing the member to be molded are provided with a processed shape corresponding to the predetermined shape.
It is characterized in that the processed shapes of the conductive member and the second fixing member are each applied to the member to be molded at the time of the collision to form the predetermined shape.

The electromagnetic molding apparatus of the embodiment according to claim 5 is
The processed shape of the conductive member has a convex shape toward the member to be molded.
It is characterized in that the processed shape of the second fixing member has a concave shape toward the member to be molded.

The electromagnetic molding apparatus of the embodiment according to claim 6 is
The processed shape of the conductive member has a concave shape toward the member to be molded.
The processed shape of the second fixing member has a convex shape toward the member to be molded.

The electromagnetic molding apparatus of the embodiment according to claim 7 is
The conductive member is an alloy containing aluminum, copper, or any of them.

The electromagnetic molding apparatus of the embodiment according to claim 8 is
The conductive member is characterized by containing reinforcing fibers.

According to the invention of claim 1 of the present application, it is possible to provide an electromagnetic molding method for joining a first member to be molded and a second member to be molded by an electromagnetic force induced in the conductive member. Thereby, the energy consumption can be suppressed and the molded member can be provided. Further, since the first member to be molded and the second member to be molded are joined by colliding with each other, the temperature of the molded member is unlikely to rise. Therefore, the intermetallic compound is less likely to be generated at the bonding interface, and the mechanical strength of the molded member is kept stable.

According to the second aspect of the present application, it is possible to provide an electromagnetic molding method for imparting a shape to a member to be molded by an electromagnetic force induced in the conductive member. Thereby, the energy consumption can be suppressed and the molded member can be provided. For example, the member to be molded is urged and deformed by a very large force, so that the spring back of the molded member is minimized.

According to the third aspect of the present application, it is possible to provide an electromagnetic molding apparatus for joining a first member to be molded and a second member to be molded by an electromagnetic force induced in the conductive member. Thereby, the energy consumption can be suppressed and the molded member can be provided. Further, since the first member to be molded and the second member to be molded are joined by colliding with each other, the temperature of the molded member is unlikely to rise. Therefore, the intermetallic compound is less likely to be generated at the bonding interface, and the mechanical strength of the molded member is kept stable.

According to the fourth aspect of the present application, it is possible to provide an electromagnetic molding apparatus that imparts a shape to a member to be molded by an electromagnetic force induced in the conductive member. Thereby, the energy consumption can be suppressed and the molded member can be provided. For example, the member to be molded is urged and deformed by a very large force, so that the spring back of the molded member is minimized.

According to the fifth aspect of the present application, an electromagnetic molding apparatus that imparts a paired shape to a surface of the member to be molded facing the conductive member and a surface of the member to be molded facing the second fixing member. Can be provided. Even if the given shape is complex, the spring back is minimized and the molding is ensured.

According to the sixth aspect of the present application, an electromagnetic molding apparatus that imparts a paired shape to a surface of a member to be molded facing a conductive member and a surface of the member to be molded facing a second fixing member. Can be provided. Even if the given shape is complex, the spring back is minimized and the molding is ensured.

According to the invention according to claim 7 of the present application, it is possible to provide an electromagnetic molding apparatus including a conductive member containing highly conductive aluminum or copper so that an electromagnetic force is induced.

According to the eighth aspect of the present application, the impact when the first member to be molded collides with the second member to be molded or the impact when the member to be molded collides with the second fixing member is tolerated. , An electromagnetic molding apparatus including a conductive member including a reinforcing fiber having high mechanical strength can be provided.

It is the schematic which shows the electromagnetic molding apparatus which concerns on 1st Embodiment of this invention. It is a schematic diagram which shows the state of the 1st molded member and the 2nd molded member when the electromagnetic force is not applied to the conductive member in 1st Embodiment. It is a schematic diagram which shows the state of the 1st molded member and the 2nd molded member when the electromagnetic force is applied to the conductive member in 1st Embodiment. It is the schematic which shows the electromagnetic molding apparatus which concerns on 2nd Embodiment of this invention. It is a schematic diagram which shows the state of the member to be molded when the electromagnetic force is not applied to a conductive member in 2nd Embodiment. FIG. 5 is a schematic view showing a state of a member to be molded when an electromagnetic force is applied to the conductive member in the second embodiment.

[1. First Embodiment]
Hereinafter, the first embodiment of the electromagnetic molding method according to the present invention will be described together with an electromagnetic molding apparatus for molding the method with reference to the accompanying drawings.

[1.1: Electromagnetic molding equipment]
FIG. 1 shows a schematic configuration of an electromagnetic molding apparatus 100 according to an embodiment of the present invention. The electromagnetic molding device 100 is a molding device that joins the first member to be molded and the second member to be molded.

[1.2: Outline of electromagnetic molding equipment]
As shown in FIG. 1, the electromagnetic molding apparatus 100 generally has a lower structure 10 and a superstructure 12 arranged on the lower structure 10.

The lower structure 10 includes a rectangular parallelepiped first fixing member 14 extending from the front side to the back side of FIG. More specifically, the first fixing member 14 is a conductive conductor. The conductor 14 is electrically connected to the pulse generation circuit 16. The pulse generation circuit 16 includes a general charge / discharge circuit, includes a DC power supply 18, a capacitor 20, and a switch 22, and is configured to allow a large current to flow instantaneously through the conductor 14.

The lower structure 10 also includes a conductive member 24 above the conductor 14 that extends from the front side to the back side of FIG.

In the present embodiment, the conductive member 24 includes a plate-shaped first conductive member 26, a reinforcing member 28 composed of a plurality of strands such as a rope or a string, and a plate-shaped second conductive member 30. More specifically, the conductive member 24 is a member obtained by joining the first conductive member 26 and the second conductive member 30 in a state of sandwiching the reinforcing member 28 by electromagnetic molding. Further, the conductive member 24 has a wavy pattern 32 characteristic in electromagnetic molding at the bonding interface between the first conductive member 26 and the second conductive member 30.

The superstructure 12 of the electromagnetic molding apparatus 100 includes a rectangular parallelepiped second fixing member 34 extending from the front side to the back side of FIG. More specifically, the second fixing member 34 is a fixing portion having high rigidity.

[1.3: Molding method]
An example of a molding method using the electromagnetic molding apparatus 100 having the above-described configuration will be described. In the actual molding, the conductive member 24 extending from the front side to the back side of FIG. 1 is installed above the conductor 14 with a gap between the conductor 14 and the conductor 14. In the embodiment, the first molded member 36 is a plate-shaped member extending from the front side to the back side of FIG. 1, and is arranged in contact with the upper surface of the conductive member 24. The second molded member 38 is a plate-shaped member extending from the front side to the back side in FIG. 1, and is arranged below the fixing portion 34. In the embodiment, the width of the second member to be molded 38 is the same as or substantially the same as the width of the first member to be molded 36. Therefore, the entire surface of the second member to be molded 38 faces substantially the entire surface of the first member to be molded 36. For the sake of explanation, the first member to be molded 36 and the second member to be molded 38 are shown with a sufficient gap between them in FIG. 1, but in actual molding, the first member to be molded 36 is shown. The distance between and the second member to be molded 38 is set to a value most suitable for joining the two.

In the above state, the pulse generation circuit 16 connected to the conductor 14 applies a pulse current 40 represented by a single point chain line to the conductor 14, which is composed of a single pulse having a pulse width of about 100 μsec or less and about 10 kA to about 200 kA.

As a result, a momentary magnetic field 42 represented by the alternate long and short dash line is generated around the conductor 14. At the same time, due to electromagnetic induction, an induced current 44 indicated by a two-dot chain line (from the back side to the front side in FIG. 1) in the direction opposite to the pulse current 40 flows inside the conductive member 24. As a result, the upward electromagnetic force 46 indicated by the alternate long and short dash line was generated in the direction orthogonal to the magnetic field 42 and the induced current 44, and the conductive member 24 brought the first member to be molded 36 into contact with the upper surface. In this state, it is momentarily urged toward the upper second member to be molded 38. As a result, the first member to be molded 36 collides with the second member to be molded 38 with a large force, and the first member to be molded 36 and the second member to be molded 38 are joined (described later with reference to FIG. 3). The impact when the first member to be molded 36 collides with the second member to be molded 38 is absorbed by the fixing portion 34.

In the above-described embodiment, for example, the first conductive member 26 of the conductive member 24 is made of an aluminum plate, and the reinforcing member 28 is a length obtained by bundling a large number of reinforcing fibers such as carbon fibers (single fibers) or glass fibers. A plurality of filaments of a fiber bundle or tows composed of a large number of filaments are arranged in parallel, and the second conductive member 30 is composed of an aluminum plate.

Further, in the above-described embodiment, for example, the first member to be molded 36 is made of an iron plate, and the second member 38 to be molded is also made of an iron plate.

As shown in FIG. 3, in this case, in the molded joining member 48, a wavy pattern characteristic of electromagnetic molding is formed at the joining interface between the first molded member 36 made of an iron plate and the second molded member 38 made of an iron plate. 50 appears.

[2. Second Embodiment]
In addition, a second embodiment of the electromagnetic molding method according to the present invention will be described together with an electromagnetic molding apparatus that performs the molding.

[2.1: Electromagnetic molding equipment]
FIG. 4 shows a schematic configuration of the electromagnetic molding apparatus 200 according to the embodiment of the present invention. The electromagnetic molding apparatus 200 is a molding apparatus for molding a member to be molded.

[2.2: Outline of electromagnetic molding equipment]
As shown in FIG. 4, the electromagnetic molding apparatus 200 generally has a substructure 110 and a superstructure 112 arranged on the substructure 110.

Similar to the first embodiment, the lower structure 110 includes a rectangular parallelepiped first fixing member 114 extending from the front side to the back side of FIG. More specifically, the first fixing member 114 is a conductive conductor. The conductor 114 is electrically connected to the pulse generation circuit 116 having the same configuration as that of the first embodiment. The pulse generation circuit 116 includes a general charge / discharge circuit, includes a DC power supply 118, a capacitor 120, and a switch 122, and is configured so that a large current can be instantaneously passed through the conductor 114.

The substructure 110 also includes a conductive member 124 above the conductor 114 that extends from the front side to the back side of FIG.

In the present embodiment, the conductive member 124 includes a first conductive member 126, a reinforcing member 128 composed of a plurality of strands such as a rope or a string, and a second conductive member 130, as in the first embodiment. .. More specifically, the conductive member 124 is a member obtained by joining the first conductive member 126 and the second conductive member 130 in a state of sandwiching the reinforcing member 128 by electromagnetic molding. Further, the conductive member 124 has a wavy pattern 132 characteristic in electromagnetic molding at the bonding interface between the first conductive member 126 and the second conductive member 130. Further, unlike the first embodiment, the conductive member 124 has an upwardly convex mold portion 152 substantially in the center in the left-right direction of FIG.

Similar to the first embodiment, the superstructure 112 of the electromagnetic molding apparatus 200 includes a rectangular parallelepiped second fixing member 134 extending from the front side to the back side of FIG. More specifically, the second fixing member 134 is a highly rigid fixing portion. Unlike the first embodiment, the fixed portion 134 has an upwardly concave mold portion 154 at substantially the center in the left-right direction of FIG.

[2.3: Molding method]
An example of a molding method using the electromagnetic molding apparatus 200 having the above-described configuration will be described. In the actual molding, the conductive member 124 extending from the front side to the back side of FIG. 4 is installed above the conductor 114 with a gap between the conductor 114 and the conductor 114, as in the first embodiment. .. In the embodiment, the member to be molded 156 is a plate-shaped member extending from the front side to the back side of FIG. 1, and is arranged in contact with the upper surface of the mold portion 152 of the conductive member 124. For the sake of explanation, the fixed portion 134 and the member to be molded 156 are shown with a sufficient gap between them in FIG. 4, but in actual molding, the distance between the fixed portion 134 and the member to be molded 156 is shown. Is set to a value most suitable for molding the member to be molded 156.

In the above state, the pulse generating circuit 116 connected to the conductor 114 is composed of a single pulse having a pulse width of about 100 μsec or less and a pulse current of about 10 kA to about 200 kA, as in the first embodiment, and has a pulse current 140 represented by a chain line. Is applied to the conductor 114.

As a result, as in the first embodiment, the instantaneous magnetic field 142 represented by the alternate long and short dash line is generated around the conductor 114. At the same time, due to electromagnetic induction, an induced current 144 indicated by a two-dot chain line (from the back side to the front side in FIG. 1) in the direction opposite to the pulse current 140 flows inside the conductive member 124. As a result, the upward electromagnetic force 146 indicated by the alternate long and short dash line is generated in the direction orthogonal to the magnetic field 142 and the induced current 144, and the conductive member 124 abuts the molded member 156 on the upper surface of the mold portion 152. In the state of being made to move, it is momentarily urged toward the upper fixed portion 134. As a result, the member to be molded 156 collides with the fixed portion 134 with a large force, and unlike the first embodiment, the member to be molded 156 is given a shape (described later with reference to FIG. 6). The fixing portion 134 absorbs the impact when the member to be molded 156 collides.

In the above-described embodiment, as in the first embodiment, for example, the first conductive member 126 of the conductive member 124 is composed of an aluminum plate, and the reinforcing member 128 is a large number of carbon fibers (single fibers) or glass fibers. A plurality of filaments of a long fiber bundle in which reinforcing fibers such as the above are bundled or tows composed of a large number of filaments are arranged in parallel, and the second conductive member 130 is composed of an aluminum plate.

Further, in the above-described embodiment, for example, the member to be molded 156 is composed of an iron plate, as in the first embodiment.

[3. Other embodiments]
In the above-described embodiment, the conductive member 124 may have a downwardly concave mold portion. At this time, the fixing portion 134 may have a downwardly convex mold portion.

In the above-described embodiment, the convex mold portion 152 of the conductive member 124 and the concave mold portion 154 of the fixing portion 134 may have a more complicated and fine shape. Since the conductive member 124 urges the member to be molded 156 with a very large force, the spring back of the member to be molded 156 after molding is minimized. Therefore, the complicated and fine shape of the mold portion 152 and the mold portion 154 can be surely given to the member to be molded 156.

In the above-described embodiment, the first conductive members 26, 126 and the second conductive members 30, 130 of the conductive members 24, 124 may be a conductive material other than aluminum, for example, copper. Further, the conductive members 24 and 124 may be made of a single metal material such as aluminum, which does not include the reinforcing members 28 and 128, as long as they have sufficient rigidity. In any case, for the conductive members 24 and 124, an appropriate material can be selected so as to satisfy the strength capable of withstanding the impact during molding.

In the above-described embodiment, the first member to be molded 36, the second member to be molded 38, and the member to be molded 156 may be a metal material other than iron, for example, stainless steel. In any case, the first molded member 36, the second molded member 38, and the molded member 156 are provided with suitable materials so as to satisfy the strength required for the final molded product regardless of the conductivity. It is selectable.

100,200: Electromagnetic molding device 14,114: Conductor (first fixing member)
24,124: Conductive member 34,134: Fixing part (second fixing member)
36: 1st member to be molded 38: 2nd member to be molded 40, 140: Pulse current 46, 146: Electromagnetic force 152, 154: Mold part (processed shape)
156: Member to be molded

Claims (8)

The first fixing member and the second fixing member are arranged so as to face each other.
The conductive member, the first molded member, and the second molded member are arranged in order from the first fixing member to the second fixing member.
By applying an electric current to the first fixing member, an electromagnetic force (thrust) from the first fixing member toward the second fixing member is induced in the conductive member based on the principle of electromagnetic induction, and the electromagnetic force is induced. An electromagnetic molding method, characterized in that the first member to be molded is made to collide with the second member to be molded and the first member to be molded is joined to the second member to be molded. The first fixing member and the second fixing member are arranged so as to face each other.
The conductive member and the member to be molded are arranged in order from the first fixing member to the second fixing member.
By applying an electric current to the first fixing member, an electromagnetic force (thrust) from the first fixing member toward the second fixing member is induced in the conductive member based on the principle of electromagnetic induction, and the electromagnetic force is induced. This is an electromagnetic molding method in which the conductive member is urged to cause the member to be molded to collide with the second fixing member to give a predetermined shape to the member to be molded.
The surface of the conductive member facing the member to be molded and the surface of the second fixing member facing the member to be molded are provided with a processed shape corresponding to the predetermined shape.
An electromagnetic molding method, characterized in that the processed shapes of the conductive member and the second fixing member are each applied to the member to be molded at the time of a collision to form the predetermined shape. With the conductive first fixing member,
A second fixing member arranged to face the first fixing member,
A conductive member arranged between the first fixing member and the second fixing member,
It is connected to the first fixing member and includes a charge / discharge circuit that applies a pulse current to the first fixing member.
The charging is performed in a state where the first member to be molded and the second member to be molded are arranged in order from the conductive member toward the second fixing member between the conductive member and the second fixing member. By applying the pulse current from the discharge circuit to the first fixing member, an electromagnetic force (thrust) from the first fixing member to the second fixing member is induced in the conductive member based on the principle of electromagnetic induction. An electromagnetic molding apparatus configured to cause the first member to be molded to collide with the second member to be molded by the electromagnetic force and to join the first member to be molded to the second member to be molded. With the conductive first fixing member,
A second fixing member arranged to face the first fixing member,
A conductive member arranged between the first fixing member and the second fixing member,
It is connected to the first fixing member and includes a charge / discharge circuit that applies a pulse current to the first fixing member.
Based on the principle of electromagnetic induction, by applying the pulse current from the charge / discharge circuit to the first fixed member in a state where the member to be molded is arranged between the conductive member and the second fixed member. An electromagnetic force (thrust) from the first fixing member toward the second fixing member is induced in the conductive member, and the conductive member is urged by the electromagnetic force to make the member to be molded the second member. An electromagnetic molding device configured to collide with a fixed member to give a predetermined shape to the member to be molded.
The surface of the conductive member facing the member to be molded and the surface of the second fixing member facing the member to be molded are provided with a processed shape corresponding to the predetermined shape.
An electromagnetic molding apparatus characterized in that the processed shapes of the conductive member and the second fixing member are each applied to the member to be molded at the time of the collision to form the predetermined shape. The processed shape of the conductive member has a convex shape toward the member to be molded.
The electromagnetic molding apparatus according to claim 4, wherein the processed shape of the second fixing member has a concave shape toward the member to be molded. The processed shape of the conductive member has a concave shape toward the member to be molded.
The electromagnetic molding apparatus according to claim 4, wherein the processed shape of the second fixing member has a convex shape toward the member to be molded. The electromagnetic molding apparatus according to any one of claims 3 to 6, wherein the conductive member is aluminum, copper, or an alloy containing any of them. The electromagnetic molding apparatus according to any one of claims 3 to 7, wherein the conductive member contains reinforcing fibers.

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