JP2021035688A - Metal plate thickening method - Google Patents

Abstract

To make it possible to thicken a desired part of a metal plate with good efficiency.SOLUTION: According to this processing method for partially thickening a metal plate 1, a one side face 1b in a thickness direction of the metal plate 1 and a part of the other side face 1a other than a thickening part 1e are arrested, the thickening part 1e is pressurized by a pressurizing punch 13 with a pressurizing force that does not cause buckling and is heated by a heating coil 15, and pressurizing and compressing are performed from both end sides 1c, 1d in a direction orthogonal to the thickness of the metal plate 1, thereby increasing the thickness of the thickening part 1e.SELECTED DRAWING: Figure 2

Description

The present invention relates to a partial thickening process of a metal plate.

A metal plate is used as a material for constituting an automobile. For example, a press-molded product obtained by press-molding a metal plate is used for a frame of a vehicle body or the like.

Then, by performing such a process of providing a difference in the thickness of each part of the metal plate, it has been conventionally performed to partially increase the strength of the metal plate or reduce the weight of the metal plate.

For example, in Patent Document 1, a steel sheet having a non-uniform thickness is formed by rolling the steel sheet while partially heating it with a rolling mill.

Japanese Unexamined Patent Publication No. 2014-161900

In the processing method as in Patent Document 1, since a dedicated rolling mill and a rolling process are required separately, there are problems that the manufacturing cost increases and the manufacturing equipment becomes large.

Further, as a method for thickening the metal plate by a method different from Patent Document 1, the metal plate is restrained from the lower surface side in the pressing process, and the upper surface side is opened in a direction orthogonal to the thickness direction of the metal plate. There is a method of thickening the metal plate to the upper surface side by pressurizing and compressing from both ends.

In this method, the metal plate can be thickened only by changing the molding die in the press molding process, but it is difficult to limit the thickening portion, so that the thickening portion is increased except for the desired portion. Therefore, there is a problem that the thickness of the metal plate after the processing becomes inefficient and the distribution of the thickness of the metal plate after the processing becomes uneven, and the quality of the processing is not stable.

In order to solve the above problems, the present invention is a method for partially thickening a metal plate, in which one side surface of the metal plate in the thickness direction and a portion of the other side surface that is not the thickening portion are constrained. It is characterized in that the thickened portion is thickened by pressurizing the thickened portion, heating the thickened portion by a heating means, and pressurizing and compressing the thickened portion in a direction orthogonal to the thickness direction.

According to the present invention, the other side surface in the thickness direction of the metal plate is partially opened, and the portion (thickening portion) is heated by the heating means, so that the portion can be selectively thickened. Therefore, it is possible to efficiently increase the thickness and improve the accuracy of the processing. In addition, the pressing force for thickening can be reduced, and the pressurizing equipment can be miniaturized.

Further, buckling of the thickened portion can be prevented by performing the thickening process while pressurizing the thickened portion by the light pressurizing portion. That is, when a metal plate, particularly a thin metal plate having a small thickness, is pressed from both ends to partially increase the thickness, buckling occurs in the thickened portion. However, by pressurizing the thickened portion with an appropriate pressing force, it is possible to increase the thickness while preventing buckling of the thickened portion.

Further, the present invention is a method for thickening a metal plate having a bent portion, in which a surface corresponding to the outside of the bent portion of the metal plate is restrained and the bent portion is heated by a heating means to obtain the bent portion. By pressurizing and compressing the bent portion from one side and the other side of the metal plate with the boundary between the two, the bent portion is thickened inward.

According to the present invention, only the inside of the bent portion can be selectively thickened. Therefore, it is possible to efficiently increase the thickness and improve the accuracy of the processing. In addition, the pressing force for thickening can be reduced, and the pressurizing equipment can be miniaturized.

According to the present invention, it is possible to selectively increase the thickness of a desired portion without requiring a large-scale equipment, reduce the processing cost, and improve the processing accuracy.

It is sectional drawing which shows the thickening processing method which concerns on one Embodiment of this invention. It is sectional drawing which shows the state at the time of the wall thickening processing of the said embodiment. It is a perspective view which shows the state before and after the thickening process of a metal plate, (a) is a figure which shows the state before processing, and (b) is a figure which shows the state after processing. It is a side view which shows the thickening processing method of a different embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

As shown in FIG. 1, the thickening processing apparatus 10 of the present embodiment includes an upper die 11, a lower die 12, a heating punch 13 as a light pressurizing member, a compression punch 14 as a pressurizing member, and the like.

The metal plate 1 as a work, which is a thin metal plate, is arranged in a cavity 19 formed between the upper mold 11 and the lower mold 12.

The lower surface 1b of the metal plate 1 is in contact with the lower mold 12 on the entire surface thereof. On the other hand, the upper surface 1a of the metal plate 1 is provided with an open portion 1e as a thickening portion in which a part thereof is in contact with the upper die 11 and the upper die 11 is not in contact with the upper die 11. In other words, a part of the upper surface 1a of the metal plate 1 is restrained by the upper mold 11 and the lower surface 1b is restrained by the lower mold 12. Further, the metal plate 1 is restrained by abutting both end surfaces of the metal plate 1 in the direction perpendicular to the paper surface of FIG. 1 with the upper mold 11 and the lower mold 12, or a restraint mold (not shown). Due to these restraints, it is possible to regulate the thickening of this portion of the metal plate 1 during the thickening process described later. The open portion 1e extends in the direction perpendicular to the paper surface, and is provided from one end side to the other end side of the metal plate 1 in this direction.

A heating punch 13 is provided at a position facing the open portion 1e of the metal plate 1. The heating punch 13 has a flat pressure surface 13a extending in the direction perpendicular to the paper surface of FIG.

The heating punch 13 can move in the vertical direction in the figure, and can pressurize the open portion 1e in the downward direction in the figure.

Further, the heating punch 13 has a built-in heating coil 15 as a heating means. The heating punch 13 is heated by the heating coil 15 to pressurize the opening portion 1e and transfer the heat of the heating means to the opening portion 1e. In this way, the heating coil 15 heats the open portion 1e via the heating punch 13. However, the heating means may be arranged on the outer peripheral side of the heating punch 13, or the heating punch 13 is not heated, but is provided on the upper mold 11, for example, to heat the open portion 1e. May be good.

Compression punches 14 are provided at positions facing the left and right end surfaces 1c and 1d of the metal plate 1, respectively. The compression punch 14 can be moved in the left-right direction in the drawing, and by moving to the metal plate 1 side, the metal plate 1 can be pressure-compressed by contacting the left and right end surfaces 1c and 1d of the metal plate 1, respectively. it can.

When the metal plate 1 is thickened, FIG. 2 shows that the three surfaces of the metal plate 1 (the lower surface 1b and both end surfaces in the vertical direction of the paper surface) and the upper surface 1a other than the open portion 1e are restrained. As shown in the above, the end faces 1c and 1d of the metal plate 1 are pressurized by the compression punch 14, respectively. At this time, the heating punch 13 heated by the heating means pressurizes and heats the open portion 1e. More specifically, the heating punch 13 pressurizes the open portion 1e with a predetermined pressing force for preventing buckling, which will be described later, and the heat transferred from the heating means causes the open portion 1e and its peripheral portion (for example, for example). Area A indicated by the scattered points in the figure) can be heated.

The metal plate 1 is compressed by pressing both end surfaces 1c and 1d by the compression punch 14, and a part of the metal plate 1 is thickened. Specifically, the metal plate 1 is constrained on its three surfaces and a part of the upper surface 1a, so that the open portion 1e is selectively thickened toward the upper side in the drawing.

In particular, in the present embodiment, by heating the open portion 1e with the heating punch 13, the open portion 1e can be softened and the thickening of the open portion 1e can be promoted.

Further, when the metal plate 1 having a small thickness is compressed and thickened as in the present embodiment, buckling may occur in the thickened portion. However, in the present embodiment, the heating punch 13 lightly pressurizes the open portion 1e, which is the thickening portion, in the direction opposite to the thickening direction, so that buckling of the opening portion 1e can be prevented.

If the pressing force on the opening portion 1e of the heating punch 13 is too large, the thickening of the opening portion 1e is hindered, but on the other hand, if the pressing force is too small, the buckling of the opening portion 1e can be sufficiently prevented. It will disappear. Therefore, the pressing force of the heating punch 13 is dynamic with the material characteristics such as the thickness and compressive strength of the metal plate 1, the mold shapes of the upper mold 11 and the lower mold 12, and the forming function such as the friction coefficient with the metal plate 1 as parameters. The appropriate pressing force is set by a numerical numerical calculation, and for example, this pressing force can be calculated by CAE (Computer Aided Engineering) analysis. Further, the appropriate pressing force for preventing the buckling increases from moment to moment in the process of thickening according to the amount of compression or the amount of thickening of the metal plate 1. Therefore, the thickening rate of the metal plate 1 is also taken into consideration as a parameter in the above numerical calculation, and the pressing force of the heating punch 13 is changed. For example, as a control of the heating punch 13, the pressing force can be changed according to the displacement amount of the compression punch 14.

As described above, in the present embodiment, the predetermined portion of the metal plate 1 can be selectively thickened, and efficient thickening processing is possible. Further, by limiting the thickening portion, the pressurizing and compressing force required for thickening becomes small, so that the compression punch 14 can be miniaturized and the processing cost can be reduced.

It is not always necessary to pressurize the both end faces 1c and 1d of the metal plate 1 with the compression punch 14. For example, one end face side can be constrained by a restraint type or the like, and the compression punch 14 can pressurize only from the other side. .. Even in this case, the opening portion 1e can be selectively thickened by causing stress in the compression direction in the metal plate 1.

As an example of applying the thickening processing method of the present embodiment, a case where the portion corresponding to the R portion of the metal plate after press molding is thickened will be described.

As shown in FIG. 3A, the metal plate 1 is thickened by the above-mentioned thickening processing method, with the thickening portion (open portion) 1e at two locations in the left-right direction in the drawing. Then, as shown in FIG. 3B, the convex portion 1f in which the R portion is formed by the thickening portion 1e can be formed by press molding. As a result, the R portion, which tends to be weak in strength, can be reinforced. In the illustrated example, the thickening portion 1e has a square shape, but the shape of the thickening portion 1e can be changed by changing the shape of the upper mold 11 (see FIG. 2). You can also.

As shown in FIG. 4, the metal plate 2 of the present embodiment has a bent portion 2e, and has a substantially L-shaped cross section having a portion extending from the bent portion 2e in two directions substantially perpendicular to each other. There is. The metal plate 2 of the present embodiment is formed by, for example, bending a flat plate-shaped thin plate.

In the metal plate 2, the outer surface 2b corresponding to the outer side of the bent portion 2e is restrained by the restraint mold 21, and the inner side surface 2a corresponding to the inner side of the bent portion 2e is open. In addition, both end faces in the vertical direction of the paper in the figure are constrained.

During the wall thickening process, the one side end surface 2c and the other side end surface 2d in the vertical direction are pressurized (see the arrow in the figure). That is, the bent portion 2e is pressurized from both one side and the other side of the metal plate 1 with the bent portion 2e as a boundary (that is, the end surface 2c side and the end surface 2d side of the bent portion 2e of the metal plate 1). .. Further, the bent portion 2e is heated from the inside by an induction heating device 22 which is a non-contact heating means. As the pressurizing means, a punch member that can move in the pressurizing direction and the opposite direction as described above can be used.

In the bent portion 2e softened by heating by the induction heating device 22, the side of the outer surface 2b sticks to the restraint mold 21 due to the pressure applied to the end surface 2c and the end surface 2d, and the bent portion 2e is directed toward the open inner surface 2a as shown in the figure. Increase the meat.

As described above, in the present embodiment, the portion where the pressurizing directions with respect to the end face 2c and the end face 2d intersect, that is, the bent portion 2e is pressurized and compressed, so that the thickened portion is the portion of the bent portion 2e (particularly the inner surface surface). It can be limited to the part on the 2a side). Therefore, in the present embodiment, the thickening portion can be limited to the bent portion 2e without restraining the inner side surface 2a.

Further, by heating the bent portion 2e with the induction heating device 22, it is possible to promote the inward thickening of the bent portion 2e.

When the bent portion 2e is thickened inward as in the present embodiment, buckling occurs as in the case where the open portion 1e which is a flat portion is thickened as in the above-described embodiment, and the thickened portion is formed. Does not bend significantly. Therefore, the wall thickening process can be performed without providing a light pressurizing portion for applying a pressing force for preventing buckling.

Further, by using the non-contact induction heating device 22 as the heating means, it is not necessary to bring the heating means into contact with the inner side surface 2a. That is, in the present embodiment, it is not necessary to bring the member corresponding to the lightly pressurized portion into contact with the inner side surface 2a for buckling prevention or heating, and therefore, the bent portion 2e which is the thickened portion It is also possible to prevent wear of the light pressurizing means and the heating means due to sliding with the inner portion.

1 Metal plate 1a Upper side surface 1b Lower side surface 1c End surface 1d End surface 1e Open part (thickening part)
2 Metal plate 2a Inner side surface 2b Outer side surface 2c End surface 2d End surface 2e Bent part (thickening part)
10 Wall thickening equipment 11 Upper mold 12 Lower mold 13 Heating punch (light pressure member)
14 Compression punch (pressurizing member)
15 Heating coil (heating means)
21 Restraint type 22 Induction heating device (heating means)

Claims (2)

It is a method of partially thickening a metal plate.
Restraining one side surface of the metal plate in the thickness direction and the portion of the other side surface that is not the thickened portion,
A thickening process of a metal plate, characterized in that the thickened portion is thickened by pressurizing and compressing the thickened portion in a direction orthogonal to the thickness direction while heating the thickened portion by a heating means. Method. This is a method for thickening a metal plate having a bent portion.
The surface of the metal plate corresponding to the outside of the bent portion is restrained, and the bent portion is heated by a heating means.
The thickness of the metal plate is increased by pressurizing and compressing the bent portion from one side and the other side of the metal plate with the bent portion as a boundary to increase the thickness of the bent portion inward. Processing method.

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