JP2016043403A - Press-forming method and method for manufacturing press-formed component - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for manufacturing a bent channel component having a bent part in a vertical wall part by press-forming, capable of suppressing shrinkage flangings themselves generated in the vertical wall part and a flange part.SOLUTION: The method has a shear deformation process as the forming process of the vertical wall part. In the shear deformation process, the part 11a of a boundary side of the deformed part 12 of the base 11 of a blank 1 and the outside part 12b of the deformed part 12 are separately bound, and a part 12a constituting the vertical wall part of the deformed part 12 is sheared and deformed within a plate surface, thereby forming the flow of a material from the bent part to a part away from the bent part (movement of material in blank) in the outer edge of the part 12a constituting the vertical wall part.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a press molding technique for molding a press molded part having a curved vertical wall portion such as a curved channel part. The present invention is a technique particularly suitable for press molding of the curved portion of the vertical wall portion that shrinks and deforms in accordance with molding.

  In recent years, higher strength steel sheets have been demanded in order to achieve both collision safety of automobiles and weight reduction of vehicle bodies. However, as the tensile strength of the steel sheet increases, the ductility that greatly affects the press formability tends to decrease. Therefore, the shape of a press-formed product is simplified, and the shape that can be formed even with a steel plate with poor ductility is studied, and the press forming method suitable for a high-strength steel plate is being studied.

  When press-molding a high-strength steel sheet having poor ductility, drawing molding or foam (bending) molding is often employed. For example, a simple-shaped channel part consisting of a vertical wall part and a top plate part that continues to the vertical wall part, with no curved part in the vertical wall part, is manufactured by foam molding, and a channel part with a flange is manufactured by drawing. Is done. In foam molding, a blank (a plate-shaped workpiece) is placed on a punch, and the blank is bent by a die to obtain a product shape. In order to suppress the generation of wrinkles in the blank portion with which the upper portion of the punch abuts, the blank may be pressed between the punch and the pad.

  In the drawing, first, a wrinkle presser is arranged at a position to be a flange portion, a blank is set as a punch on the wrinkle presser, and a die is set above the blank. Next, by lowering the die, the blank is pressed with a die and a crease, and the blank is bent while applying an appropriate tension to the blank. At this time, the material (blank) largely pulled between the punch and the die by being pressed by the die and the wrinkle presser forms a vertical wall portion. Therefore, even if it is a material with poor ductility, shaping | molding of a vertical wall part becomes easy.

As a method of adjusting the tension, there are a method of changing the force (cushion pressure) for pressing the blank between the die and the wrinkle press, and a method of installing a bead portion at the press position. If the tension applied to the blank is too weak, the material inflow into the vertical wall becomes excessive and wrinkles (remaining meat) are likely to occur.
The press-formed product for automobiles includes a curved channel part (such as a lower arm part shown in FIG. 10) having a curved part on a vertical wall part and a curved channel part (such as a part shown in FIG. 3) having a flange part. In addition, there is a part shape (such as the part shape shown in FIG. 12) having a curved portion in the top plate portion or the like as the vertical wall portion is curved.

  Here, when a curved channel part having a curved portion on the vertical wall portion is produced by foam molding, the material is drawn into the vertical wall portion forming space of the mold to form the vertical wall portion. It may be deformed by being compressed in the circumferential direction. For example, at the time of molding, in the curved part that curves convexly on the top plate part side so that the boundary line between the top plate part and the vertical wall part becomes a convex curve on the top plate part side, the material The wire length is excessively excessive, and the material is compressed and deformed in the circumferential direction of the curved portion. This deformation is called “shrink flange deformation”. Since the shrinkage flange deformation is so large as to be drawn into the vertical wall portion forming space from a position away from the curved portion (for example, the portion denoted by reference numeral 42a in FIG. 10 or the portion denoted by reference numeral 22a in FIG. 3), the outer edge of the vertical wall portion Wrinkles occur when the compressive stress exceeds the buckling strength of the material near the part.

Similarly, when a curved channel part having a flange portion is manufactured by drawing, wrinkles due to shrinkage flange deformation may occur due to the flange portion being compressed in the circumferential direction of the curved portion. is there.
The wrinkles caused by the shrinkage flange deformation are a problem particularly in materials with high yield strength such as high-strength steel sheets. Moreover, even if it is materials other than a steel plate, if it is a material with high yield strength, a wrinkle resulting from shrinkage flange deformation | transformation may generate | occur | produce.
As techniques for this, there are those described in Patent Documents 1 and 2. Patent Documents 1 and 2 propose a method of pulling the edge of the vertical wall portion or the flange portion in order to prevent the shrinkage flange deformation.

JP 07-39954 A Japanese Patent Laid-Open No. 11-123469

The methods proposed in Patent Documents 1 and 2 are methods of applying tension to compression due to shrinkage flange deformation, but metal plates with poor ductility such as high-strength steel plates and aluminum alloy plates give tensile stress to the edges. In addition, there is a problem that cracks are likely to occur at the edges. For this reason, these methods have their own limitations. When the vertical wall height or curved shape causes large shrinkage flange deformation, or when the yield strength of the material is high, wrinkles due to shrinkage flange deformation are prevented. I can't.
An object of the present invention is a method for producing a press-molded part such as a curved channel part having a curved part in a vertical wall part by press molding, and a technique capable of suppressing the shrinkage flange deformation itself generated in the vertical wall part and the flange part. Is to provide.

  In order to solve the above-described problems, one embodiment of the present invention provides a flat plate-shaped workpiece (blank) having a base and a deformed portion including a portion that is continuous with the base and becomes a vertical wall, and at least the base When bending at the boundary with the vertical wall portion, when press-molding into a press-molded part in which the vertical wall portion having a curved portion convexly curved toward the base side is formed, the vertical wall portion As a forming step, a portion of the base portion on the boundary side with the deforming portion and an outer portion of the deforming portion are separately restrained, and a portion to be the vertical wall portion of the deforming portion is subjected to shear deformation within a plate surface. In addition, a shear deformation step of generating a flow of material from the bending portion toward a portion away from the bending portion is provided at an outer edge portion of the portion serving as the vertical wall portion.

  For example, as shown in FIG. 1A, (1) a blank 1 including a base 11 that does not deform before and after press molding and a deformed portion 12 that deforms, and the deformed portion 12 includes a portion 12a that becomes a vertical wall portion. Is used to produce a curved channel part having a curved portion in a vertical wall portion by press molding, and (2) as a step of forming the vertical wall portion, a boundary between the base portion 11 and the deformed portion 12 The portion 11a on the side and the outer portion 12b of the deformable portion 12 are separately restrained, and the portion 12a that becomes the vertical wall portion of the deformable portion 12 is subjected to shear deformation within the plate surface, as shown in FIG. As shown, a shear deformation step of causing a material flow (movement of the material in the blank) from the curved portion to a portion away from the curved portion at the outer edge portion of the portion 12a serving as the vertical wall portion. Have. The outer portion 12b is a portion that becomes a flange portion when producing a curved channel component having a flange portion, and a portion that becomes a flange portion transiently when producing a curved channel component without a flange portion.

As shown in FIG. 2, the shear deformation is a form in which a rectangular ABCD is deformed into a parallelogram ABC1D1 when receiving forces (shearing forces) parallel to and opposite to each other in the AB direction and the DC direction. is there.
According to the method of this aspect, as shown in FIG. 1B, in the shear deformation step, the outer edge portion of the portion 12a to be the vertical wall portion is indicated by an arrow X (from the bending portion, from the bending portion). Since a material flow (toward a distant portion) is generated, the outer edge portion of the curved portion is contracted and flange deformation is less likely to occur.

In the shear deformation step, the outer portion 12b and the boundary-side portion 11a are constrained, so that shrinkage flange deformation and wrinkle generation on these portions are suppressed.
In the shear deformation step, the outer portion 12b and the boundary-side portion 11a are constrained, so that the material cannot move, and the portion 12a that becomes the vertical wall portion is shear-deformed within the plate surface. It is done. Therefore, the shear deformation step can be performed stably even if the surface roughness and clearance of the mold, the cushioning force, the strength and elongation of the blank, the plate thickness, etc. fluctuate during mass production.

  In the method according to this aspect, in the step of forming the vertical wall portion, the deformed portion is outside the first constraining portion that constrains the boundary side portion as viewed from the thickness direction of the flat plate-shaped workpiece. From the state in which the second restraining part restraining the side part is separated, the second restraining part is made to have a direction in which the separation distance between the first restraining part and the second restraining part becomes smaller as the boundary part is bent. It is good to make it move relatively.

In the method of this aspect, the shear deformation step can be performed by the method of the following constitution (3) or (4).
(3) A method of moving the constrained outer portion so that a portion that becomes the vertical wall portion rotates around a bending point of the bending portion on a boundary line between the base portion and the deformation portion. In FIG. 1A, a line L is the boundary line, and a point B is a bending point of the bending portion.

(4) A method of linearly moving the constrained outer portion in a direction in which an angle with respect to the plate surface of the blank is 30 ° or more and 60 ° or less. The angle is preferably 40 ° or more and 50 ° or less, and more preferably 45 °.
In the method of the configuration (3), in the shear deformation step, the cross-sectional shape and size of the portion that becomes the vertical wall portion change to a bent portion (a boundary portion between the vertical wall portion, the top plate portion, and the flange portion). Since it is hard to change except a part, an expansion | extension and wrinkle are hard to produce in the said vertical wall part.
In the method of the configuration (4), the cross-sectional shape and dimensions of the portion 12a that becomes the vertical wall portion change in the shear deformation step. However, by setting the angle to 30 ° or more and 60 ° or less, the vertical wall portion The shrinkage that occurs is not so great as to cause wrinkles, and even if wrinkles occur in the vertical wall portion, the wrinkles can be removed by post-processing.

  If the angle is less than 30 °, when the vertical wall portion is formed only by the shear deformation step, the degree of elimination of deformation of the portion that becomes the vertical wall portion (the material is bent excessively) becomes insufficient. If wrinkles remain on the vertical wall, the wrinkles may not be removed by post-processing. When the angle exceeds 60 °, the material of the portion that becomes the vertical wall portion is greatly stretched (the direction of elongation is different from the direction of shear deformation), and cracking due to insufficient ductility of the material may occur. .

The method according to this aspect can be performed in combination with the shear deformation step and the conventional draw forming step and foam forming step as in the following configurations (5) to (7).
(5) As the step of forming the vertical wall portion, the drawing step is performed after the shear deformation step. (6) As the forming step of the vertical wall portion, the shear deformation step is performed after the drawing forming step. (7) The curved channel part does not have a flange portion outside the vertical wall portion, and the foam forming step is performed after the shear deformation step as the step of forming the vertical wall portion.

In the configurations (5) and (6), by performing the shear deformation process as a pre-process or a post-process of the drawing process, a curved press is formed as compared with the case where the vertical wall portion is formed only by the drawing process. The shrinkage flange deformation of the molded part is alleviated.
In the method of this aspect, after the shear deformation step, the outer part 12b of the deformed part exists in a flange shape on the outside of the vertical wall part. Therefore, in the method of this aspect, the flange part is provided on the outer side of the vertical wall part. Post-processing is required when producing a non-curved channel part. As a subsequent process, there is a method of removing the flange-shaped outer portion 12b using laser cutting or a trim mold.

  As the post-processing, in the configuration (7), the foam molding process is performed without removing the outer portion 12b. In the configuration (7), compared to the case where the vertical wall portion is formed only by the foam molding process, the shrinkage flange deformation of the curved press-molded part is alleviated. Further, even in the method of performing the post-process of removing the flange-shaped outer portion 12b after performing the shear deformation process, the press-formed part is curved as compared with the case where the vertical wall section is formed only by the foam-molding process. The shrinkage flange deformation is reduced.

The method according to this aspect can have the following configuration (8) or (9).
(8) It has a wrinkle extending step of extending the wrinkles generated in the vertical wall portion by sandwiching the vertical wall portion after the shear deformation step with a mold.
At this time, if unevenness for increasing the line length of the vertical wall portion is formed on the press surface of the mold that comes into contact with the vertical wall portion, wrinkles of the vertical wall portion are further extended.
(9) The said shear deformation process is performed with respect to the blank heated at 300 degreeC or more and 1000 degrees C or less. Preferably it is 400 degreeC or more and 900 degrees C or less.

  In the configuration (9), since the blank material is softened in the shear deformation step, shear deformation of the portion that becomes the vertical wall portion is likely to occur, and even when wrinkles occur in the portion that becomes the vertical wall portion, the wrinkle is stretched. It is easy. Only the part used as the vertical wall part may be sufficient as the heating position of a blank, and the whole blank may be heated. Even when the entire blank is heated, the material of the constrained portion is cooled by the mold and cured, so that there is no adverse effect on the constraining.

When the heating temperature is less than 300 ° C., the material is not sufficiently softened, so there is no advantage of heating. When the heating temperature is higher than 1000 ° C., a thick scale is generated on the surface of the blank (steel plate). As a heating method of the blank, a normal method such as heating in a heating furnace, high frequency heating, electric heating or the like can be adopted.
In addition, the material of the blank used by the method of this aspect may be any blank material used in known press molding. For example, even for blanks that are difficult to press form by conventional methods, such as high-strength steel plates of 590 MPa or higher, and aluminum alloy plates, curved channel parts in which shrinkage flange deformation is suppressed by performing this method. The parts can be obtained.

<About blank restraint method>
In the method according to this aspect, the base portion of the blank and the outer portion of the deformation portion are separately restrained in the shear deformation step. A conventionally known method can be adopted as the restraining method. For example, there are a method of fixing a blank with a jig, a method of providing a projection on a mold and hooking the blank, a method of fixing the blank with a magnetic force, and these methods are used alone or in combination.

As a specific example, there is a method of providing a screw such as a bolt on a jig that sandwiches the blank. In this method, a force for fastening the blank with the jig can be applied by a fastening force of the screw. There is also a method in which a bead portion is provided in a jig that sandwiches a blank, and in this method, bending / unbending deformation and frictional resistance that the material undergoes when moving the bead portion can be used as a restraint force for material movement. There is also a method in which a concavo-convex shape is formed by knurling (knurling) on a jig that is fixed with a blank interposed therebetween. In this method, the concavo-convex shape bites into the blank, so that the movement of the material can be easily prevented. As a method of knurling, there are a cutting method and a method of transferring the concavo-convex shape by strongly pressing it against the jig, but any method may be used as long as the concavo-convex shape is imparted to the jig.
In addition, if the part made into the uneven | corrugated shape of a jig | tool is hardened, abrasion and a missing part of an uneven | corrugated shape can be prevented. Hardening methods include induction hardening, carburizing quenching, flame quenching, laser quenching and other quenching treatments, low temperature sulfurization treatment, chemical vapor deposition and physical vapor deposition surface modification methods. Can be mentioned.

<About the movement method of the constrained blank>
When performing the shear deformation step by the method of the configuration (3) or (4), as a method of moving the outer portion of the blank while restraining, the movement of the slide of a press machine used in general press molding is used. A method of converting from the vertical direction to the movement performed in the configuration (3) or the configuration (4) is used. In that case, a mechanism using an inclined surface represented by a cam mechanism, a link mechanism, a mechanism using a lever, or the like can be adopted. In addition to using the driving force of the press machine, a method using a cylinder using electricity, air pressure, or hydraulic pressure may be employed.

According to this invention, when press-molding a press-molded part having a curved portion in the vertical wall portion, it is possible to suppress the shrinkage flange deformation itself that occurs in at least the vertical wall portion of the vertical wall portion and the flange portion.
That is, it is possible to prevent wrinkles due to shrinkage and flange deformation in a press-molded part having a curved portion in the vertical wall portion. In addition, the shear deformation step can be stably performed even when there are various fluctuations during mass production, and can greatly contribute to the reduction of the defective rate of the pressed product.
And, by applying this invention to materials that are difficult to press-form, such as high-strength steel plates of 590 MPa or higher, aluminum alloy plates, etc., it becomes possible to manufacture press-formed products of various shapes. And can greatly contribute to higher strength.

It is a figure explaining press molding of a curved channel part which is one mode of this invention. It is a schematic diagram explaining a shear deformation. It is a perspective view which shows the curved channel components produced in 1st-5th embodiment. It is sectional drawing explaining the metal mold | die and blank used by embodiment. It is sectional drawing (equivalent to AA sectional drawing of Fig.1 (a)) explaining the method of 1st Embodiment. It is sectional drawing (equivalent to AA sectional drawing of Fig.1 (a)) explaining the method of 2nd Embodiment. It is sectional drawing (equivalent to AA sectional drawing of Fig.1 (a)) explaining the method of 3rd Embodiment. It is sectional drawing (equivalent to AA sectional drawing of Fig.1 (a)) explaining the method of 4th Embodiment. It is sectional drawing (equivalent to AA sectional drawing of Fig.1 (a)) explaining the method of 5th Embodiment. It is a perspective view which shows the curved channel components produced in 6th Embodiment. It is sectional drawing (equivalent to AA sectional drawing of Fig.1 (a)) explaining the method of 6th Embodiment. It is a figure which shows another example of the curved channel components used as the object of this invention, (a) is a perspective view, (b) is a side view. It is the top view (a) explaining the method of this invention performed in the Example, and its AA sectional drawing (b). It is the top view (a) explaining the method of this invention performed in the Example, and its AA sectional drawing (b). It is the top view (a) explaining the drawing process performed in the Example, and its AA sectional drawing (b). It is the top view (a) explaining the drawing process performed in the Example, and its AA sectional drawing (b).

  Embodiments of the present invention will be described below, but the present invention is not limited to these embodiments. In the following embodiments, a curved channel part will be described as an example of a press-molded part to be manufactured, but the present invention is not limited to a curved channel part. If the vertical wall portion is a press-molded part having a curved portion that curves in a convex shape toward the top plate portion during molding, it is a target. In the shape of FIG. 3, when the boundary portion between the top plate portion and the vertical wall portion is bent along a curved fold line (boundary line), the vertical wall portion 22 is convex toward the top plate portion 21 side. In other words, this is an example in which the curved portion is formed by out-of-plane deformation (curving) in the direction in which the vertical wall portion 22 protrudes from the top plate portion 21.

[First Embodiment]
In this embodiment, a curved channel component having the shape shown in FIG. 3 is produced.
As shown in FIG. 3, the curved channel component 2 includes a top plate portion 21 corresponding to a base portion, left and right vertical wall portions 22 having a curved portion 22 a, and a flange portion 24 continuous with the vertical wall portion 22. The flange portion 24 has a curved portion 24 a at a portion continuous with the curved portion 22 a of the vertical wall portion 22.
The vertical wall portion 22 having the curved portion 22a of the curved channel component 2 and the flange portion 24 continuous thereto are formed by the following method. Here, portions other than the curved portion 22a may be formed by a normal drawing process.

  As shown in FIG. 4, the metal mold used in the press molding includes a punch 31 disposed below the blank 1 constituting the plate-shaped workpiece, and a first disposed above the punch 31 across the blank 1. It has a pad 32, a wrinkle presser 33 arranged with a space S 0 beside the punch 31, and a second pad 34 arranged above the wrinkle presser 33 with the blank 1 in between. The separation distance S0 between the punch 31 and the second pad 34 is the same as the height of the vertical wall portion 22 of the curved channel component 2 to be manufactured.

Although the blank 1 is a uniform single plate, as shown in FIG. 4, for convenience, when divided into a base portion 11 that does not deform before and after press molding and a deformed portion 12 that is deformed, the deformed portion 12 is A portion 12a to be the vertical wall portion 22 is included. Moreover, in this embodiment, in order to produce the curved channel component 2 having the flange portion 24, the deformable portion 12 includes a portion that becomes the flange portion 24.
First, as shown in FIG. 4, the boundary portion 11a of the base portion 11 of the blank 1 (the portion of the base portion 11 on the boundary side with the deformed portion 12) 11a is sandwiched and restrained by the punch 31 and the first pad 32, and deformed. The outer portion 12b of the portion 12 (the portion that becomes the flange portion) 12b is sandwiched and restrained by the wrinkle presser 33 and the second pad 34. The central portion 11b of the base portion 11 may or may not be constrained. In this state, the punch 31 and the first pad 32, and the wrinkle presser 33 and the second pad 34 are separated from each other by a separation distance S0 when viewed from the thickness direction of the blank 1.

Here, the punch 31 and the first pad 32 constitute a first restraining portion, and the wrinkle presser 33 and the second pad 34 constitute a second restraining portion.
Next, as shown in FIG. 5, the portion 12 a serving as the vertical wall portion has a point B (bending point of the curved portion 22 a of the vertical wall portion 22) B on the boundary line with the boundary side portion 11 a as indicated by an arrow A. As indicated by the arrow C, the wrinkle presser 33 and the second pad 34 that restrain the outer portion 12b so as to rotate about the center are swung relatively downward and approach the punch 31 and the first pad 32. Move along. This corresponds to a shear deformation process. By this shear deformation step, the portion 12a that becomes the vertical wall portion of the blank 1 is bent at the boundary between the boundary side portion 11a and the outer portion 12b to become the vertical wall portion 22 of the curved channel component 2.

  In this shear deformation step, as shown in FIG. 1B, the blank 1 has an in-plane surface of the portion 12 a that becomes the vertical wall portion of the deformation portion 12 in accordance with the movement of the outer portion 12 b indicated by the arrow Y. Shear deformation occurs, and a material flow indicated by an arrow X occurs at the outer edge portion of the portion 12a that becomes the vertical wall portion. For this reason, the curved channel component 2 manufactured in this embodiment is less likely to shrink and flange deformation at the outer edge of the curved portion 22a of the vertical wall portion 22.

Further, in the method of this embodiment, in the shear deformation step, the portion 12a that becomes the vertical wall portion of the blank 1 does not change the cross-sectional shape and dimensions at the portion other than the bent portion, and thus the vertical wall of the curved channel component 2 The portion 22 is less likely to wrinkle.
Furthermore, since the outer portion 12b moves while being constrained to become the flange portion 24, the outer edge portion of the curved portion 24a of the flange portion 24 is also less likely to shrink and the flange portion 24 is less likely to be wrinkled.

[Second Embodiment]
In this embodiment, similarly to the first embodiment, the curved channel component 2 having the shape shown in FIG. 3 is produced. The vertical wall portion 22 having the curved portion 22a of the curved channel component 2 and the flange portion 24 continuous thereto are formed by the following method shown in FIG.
The method of this embodiment is different from the method of the first embodiment in the method of moving the wrinkle presser 33 and the second pad 34 that restrains the outer portion 12b, and the other points are the same as the method of the first embodiment. It is.

First, as shown by a solid line in FIG. 6, the boundary portion 11 a of the base portion 11 of the blank 1 is sandwiched and restrained by the punch 31 and the first pad 32, and the outer portion of the deformable portion 12 (the portion that becomes the flange portion). ) 12b is sandwiched and restrained by the wrinkle presser 33 and the second pad 34.
Next, as shown by an arrow C in FIG. 6, the wrinkle presser 33 and the second pad 34 that restrain the outer portion 12b are brought closer to the punch 31 and the first pad 32 as viewed from the thickness direction of the blank. Move straight down diagonally. Specifically, the wrinkle presser 33 and the second pad 34 are linearly moved in an oblique direction in which the angle (θ) with respect to the plate surface of the blank 1 is 30 ° to 60 °. As a result, the constrained outer portion 12b linearly moves in the direction of θ = 30 ° to 60 °. This corresponds to a shear deformation process.

  By this shear deformation process, the portion 12a which becomes the vertical wall portion of the blank 1 is not only bent at the boundary between the boundary side portion 11a and the outer portion 12b as shown by a two-dot chain line in FIG. It extends after being deformed in the shrinking direction, and finally becomes the vertical wall portion 22 of the curved channel part 2. In the meantime, the vicinity of the boundary with the outer portion 12b of the portion 12a serving as the vertical wall portion moves along the arrow A in FIG. 6 while being bent.

In this shear deformation step, as shown in FIG. 1B, the blank 1 has an in-plane surface of the portion 12 a that becomes the vertical wall portion of the deformation portion 12 in accordance with the movement of the outer portion 12 b indicated by the arrow Y. Shear deformation occurs, and a material flow indicated by an arrow X occurs at the outer edge portion of the portion 12a that becomes the vertical wall portion. In FIG. 6, the shear deformation direction is a direction perpendicular to the paper surface.
For this reason, the curved channel component 2 manufactured in this embodiment is less likely to shrink and flange deformation at the outer edge of the curved portion 22a of the vertical wall portion 22.

In the method of this embodiment, in the shear deformation step, the cross-sectional shape of the portion 12a that becomes the vertical wall portion of the blank 1 changes, but when the outer portion 12b is moved at θ = 45 °, the press Even when molding is performed at room temperature, wrinkles that cause quality problems are unlikely to exist in the vertical wall portion 22 of the curved channel part 2.
When the movement angle (θ) of the outer portion 12b with respect to the plate surface of the blank 1 is not 45 °, the possibility that the vertical wall portion 22 is wrinkled is higher than that in the case where θ is 45 °. If θ is 30 ° or more and 60 ° or less, generation of wrinkles due to shrinkage occurring in the vertical wall portion 22 can be avoided, and even if wrinkles occur in the vertical wall portion 22, the wrinkles are small that can be removed by post-processing or the like. It will be a thing.

Further, since the outer portion 12b moves while being constrained to become the flange portion 24, the outer edge portion of the curved portion 24a of the flange portion 24 is also less likely to shrink and the flange portion 24 is less likely to wrinkle. .
In addition, by further moving from the state of FIG. 6 and sandwiching the portion 12a that becomes the vertical wall portion between the side surface of the punch 31 and the side surface of the second pad 34, the portion 12a that becomes the vertical wall portion in the state of FIG. The generated wrinkles can be stretched by being sandwiched between the side surface of the punch 31 and the side surface of the second pad 34.

[Third Embodiment]
In this embodiment, similarly to the first embodiment, the curved channel component 2 having the shape shown in FIG. 3 is produced. The vertical wall part 22 with the curved part 22a of the curved channel part 2 and the flange part 24 continuous thereto are formed by the following method shown in FIG.
The mold used for press molding is basically the same as that shown in FIG. 4, but as shown in FIG. 7, the blank 1 has a convex portion 35 a on the side surface (press surface contacting the vertical wall portion). A punch 35 is disposed. A second pad 36 having a recess 36 a on the side surface is disposed above the wrinkle presser 33. Other points are the same as in the second embodiment.

  Similarly to the method of the second embodiment, the angle (θ) with respect to the plate surface of the blank 1 is 30 ° to 30% as shown by an arrow C in the wrinkle presser 33 and the second pad 36 that restrain the outer portion 12b. It is linearly moved diagonally downward at 60 °. Along with this, shear deformation occurs in the plate surface of the portion 12a that becomes the vertical wall portion of the blank 1, and the cross-sectional shape of the portion 12a that becomes the vertical wall portion of the blank 1 is as shown by a two-dot chain line in FIG. Change. During this time, the portion near the boundary with the outer portion 12b of the portion 12a serving as the vertical wall portion moves along the arrow A in FIG. 7 while bending.

Subsequently, by moving the wrinkle presser 33 and the second pad 36, the part 12f of the portion 12a that becomes the vertical wall portion is finally sandwiched between the convex portion 35a of the punch 35 and the concave portion 36a of the second pad 36. Thus, the surface is substantially perpendicular to the surface of the flange portion 24. This process is a wrinkle stretching process.
At this time, even if wrinkles are generated in the vertical wall portion by sandwiching the vertical wall portion in the mold, the wrinkles are easily stretched. In particular, the line length of the portion 12a that becomes the vertical wall portion is increased by an amount corresponding to the recess 36a, that is, the line length can be increased. As a result, even if the wrinkle is generated in the vertical wall portion, the wrinkle is extended. It becomes.
This wrinkle stretching process may be performed finally after the shear deformation process described in the first embodiment and the like. By performing the wrinkle stretching process continuously after the shear deformation process, the number of processes is not increased for the wrinkle stretching process.

[Fourth Embodiment]
In this embodiment, similarly to the first embodiment, the curved channel component 2 having the shape shown in FIG. 3 is produced. The vertical wall part 22 with the curved part 22a of the curved channel part 2 and the flange part 24 continuous thereto are formed by the following method shown in FIG.
In this embodiment, the vertical wall portion 22 is formed in two processes in which a drawing process is performed after a shear deformation process. Therefore, a part of the portion that becomes the vertical wall portion 22 is included in the outer portion 12b restrained in the shear deformation step. In addition, the inner portion (portion on the base 11 side) 12c of the portion that becomes the vertical wall portion 22 is subjected to shear deformation within the plate surface.

The mold used in the shear deformation step is basically the same as that of the second embodiment, but as shown in FIG. 8A, a separation distance S0 between the punch 31 and the second pad 34 is produced. The value is increased or decreased by a margin set in advance to half or half of the height T2 (see FIG. 8B) of the vertical wall portion 22 of the curved channel part 2.
First, the boundary portion 11a of the base 11 of the blank 1 is sandwiched and restrained by the punch 31 and the first pad 32, and the outer portion of the deformable portion 12 (part of the portion that becomes the vertical wall portion 22 and the flange portion 24). The portion 12b is sandwiched between the wrinkle presser 33 and the second pad 34 and restrained.

  Next, as in the method of the second embodiment, the wrinkle presser 33 and the second pad 36 that restrain the outer portion 12b are connected to the plate surface of the blank 1 as shown by an arrow C in FIG. Is moved linearly in the direction in which the angle (θ) to 30 ° to 60 °. Along with this, the constrained outer portion 12b moves linearly in the direction of θ = 30 ° to 60 °, and shear deformation occurs in the plate surface of the inner portion 12c of the blank 1. This corresponds to a shear deformation process.

This shear deformation process is performed until the angle between the boundary side portion 11a of the base portion 11 and the inner portion 12c of the deformation portion 12 reaches the angle of the final product.
Next, as shown in FIG. 8B, a die 37 is installed in place of the second pad 34 constraining the outer portion 12b, and the die 37 and the wrinkle presser 33 are moved along the arrow B. The drawing process is performed at As a result, the outer portion 12b is stretched while being pulled out toward the punch 31, and the inner portion 12c is also stretched to form the vertical wall portion 22.

[Fifth Embodiment]
In this embodiment, similarly to the first embodiment, the curved channel component 2 having the shape shown in FIG. 3 is produced. The vertical wall part 22 with the curved part 22a of the curved channel part 2 and the flange part 24 continuous thereto are formed by the following method shown in FIG.
In this embodiment, the vertical wall portion 22 is formed in two steps in which a shear deformation step is performed after the drawing step.

  First, as shown in FIG. 9A, the boundary side portion 11a of the base portion 11 of the blank 1 is sandwiched and restrained by the punch 31 and the first pad 32, and the outer portion 12d (vertical wall portion) of the deformable portion 12 is obtained. A portion of the portion 12 a that becomes 22 and a portion that becomes the flange portion 24) are sandwiched between the die 37 and the wrinkle presser 33. In this state, the inner portion 12c of the deformable portion 12 of the blank 1 exists in an unconstrained state. Next, the drawing process is performed by moving the die 37 and the wrinkle presser 33 along the arrow B in a state where a predetermined tension is applied to the outer portion 12d.

Accordingly, the outer portion 12d is bent while being drawn out and extended toward the punch 31, and the blank 1 has a shape having a bent portion between the portion 12a serving as the vertical wall portion and the outer portion 12b. This drawing process is performed until the angle β between the portion 12a serving as the vertical wall portion and the side surface of the die 37 becomes, for example, 45 ° to 60 °.
Next, as shown in FIG. 9 (b), the outer portion 12 b is restrained by the wrinkle presser 33 and the second pad 34, and the wrinkle presser 33 and the second pad 34 are angled (θ) with respect to the plate surface of the blank 1. Is linearly moved in the direction of 30 ° to 60 °. As a result, the constrained outer portion 12b linearly moves in the direction of θ = 30 ° to 60 °. Along with this, shear deformation occurs in the plate surface of the portion 12a that becomes the vertical wall portion of the blank 1, and the vertical wall portion 22 and the flange portion 24 are formed. This corresponds to a shear deformation process.

[Sixth Embodiment]
In this embodiment, a method for producing a curved channel component having the shape shown in FIG. 10 will be described. Such a curved channel part is used, for example, as a lower arm part of an automobile.
As shown in FIG. 10, the curved channel component 4 includes a top plate portion 41 and a vertical wall portion 42 having a curved portion 42a. In this embodiment, the vertical wall portion 42 is formed in two stages, a shear deformation process and a foam molding process. The basic configuration of the mold used in the shear deformation process is the same as that of the second embodiment.

  As shown in FIG. 11A, first, the boundary side portion 11a of the base portion 11 of the blank 1 is sandwiched and restrained by the punch 31 and the first pad 32, and the outer portion of the deformable portion 12 (transient flange) The portion 12b is sandwiched and restrained between the wrinkle presser 33 and the second pad. In this state, as in the other embodiments, the punch 31 and the first pad 32 and the wrinkle presser 33 and the second pad 34 are separated by a distance S0 when viewed from the thickness direction of the blank 1. Yes.

  Next, the wrinkle presser 33 and the second pad 34 constraining the outer portion 12b are rotated around the boundary point B between the portion 12a serving as the vertical wall portion and the boundary side portion 11a as indicated by an arrow A. Move to do. This corresponds to a shear deformation process. This movement is stopped at a position where the portion 12a serving as the vertical wall portion is bent by a predetermined angle α. In this state, the portion 12a which becomes the vertical wall portion is an inclined wall portion, and the outer portion 12b is a flange portion.

  The predetermined angle α is preferably 20 ° or more and less than 70 °, and FIG. 11A illustrates a case where α = 40 °. Here, when the predetermined angle α is less than 20 °, shear deformation occurs. Therefore, the effect of suppressing the occurrence of stretch flange deformation is reduced. In addition, when the predetermined angle α exceeds 70 °, the shear wall is sufficiently generated only by the shear deformation process for forming the vertical wall. Therefore, it is not necessary to perform the molding separately in the two processes of the shear deformation process and the foam molding process.

Next, as shown in FIG. 11B, the second pad 34 and the wrinkle presser 33 that restrain the outer portion 12b are removed, and the die is placed on the portion 12a that becomes the vertical wall portion and the outer portion 12b. 37 is installed. Then, by moving the die 37 along the arrow B, the bent portion is extended and the vertical wall portion 42 is formed. This corresponds to the foam molding process.
In addition, the shear deformation process performed before the foam forming process is such that the angle (θ) with respect to the plate surface of the blank 1 is 30 ° to 60, as indicated by the arrow C in FIG. You may carry out by moving linearly in the direction which becomes °.

  The curved channel component shown in FIG. 10 can also be produced by a method of cutting the flange portion 24 after obtaining a molded product with a flange once by the method of the first embodiment and the second embodiment.

[Other Embodiments]
Another form of the curved channel component that is the subject of the present invention is shown in FIG.
As shown in FIG. 12, the curved channel component 60 is formed by bending the boundary portion between the top plate portion 61 and the vertical wall portion 62 with a curved fold line that protrudes toward the top plate portion. An example in which a curved portion is formed by in-plane deformation (curving) in the height direction so that 62 is convex toward the top plate portion 61 side, that is, the vertical wall portion 62 is convex toward the top plate portion 61 side. It is. Along with the curvature of the vertical wall portion, the top plate portion 61 has a curved shape so as to be concave toward the vertical wall portion side. In this example, the flange portion 64 is also curved in the out-of-plane direction.

Even in this curved channel component 60, shrinkage flange deformation is likely to occur, but by employing press molding according to the present invention (for example, press molding described in the first to sixth embodiments), generation of wrinkles due to shrinkage flange deformation. Can be suppressed.
In addition, since the top plate part 61 is also curved, the facing surface that holds the blank of the punch 31 and the first pad 32 is set to a surface shape along the curved top plate part.
Further, the curved portion of the vertical wall portion is a subject of the present invention even if the curved portion is deformed in both the out-of-plane direction and the vertical direction.

By the method described in the first to fifth embodiments and the conventional press molding (drawing molding), the vertical wall portion 22 of the curved channel part 2 and the flange portion 24 continuous thereto were formed as shown in FIG. Further, the curved channel component 4 shown in FIG. 10 was formed by the method described in the sixth embodiment and conventional press molding (form molding).
In drawing, since the material located in the flange portion is drawn into the vertical wall portion, the shape of the flange portion after molding is different from the methods of the first to fifth embodiments. The shape of the blank was changed between the methods of the first to fifth embodiments and the drawing, so that the flange width near the curved portion of the vertical wall portion was 50 mm after press forming. The shape of the blank for drawing was determined by inverse analysis based on the total strain theory.

  As blanks, five types of materials shown in Table 1 and a plate thickness of 1.2 mm were prepared.

なお、ブランクの加熱は加熱炉を用いて行い、成形前のブランクの温度は赤外線放射温度計を用いて測定した。

Note that the blank was heated using a heating furnace, and the temperature of the blank before molding was measured using an infrared radiation thermometer.

<Sample No. 1-1>
The vertical wall portion 22 of the curved channel component 2 shown in FIG. 3 and the flange portion 24 continuous thereto are formed only by the shear deformation step by the method of the first embodiment shown in FIG.
Fig.13 (a) is a top view of the used metal mold | die and a blank, FIG.13 (b) is the AA sectional drawing.
The curvature radius R1 of the inner peripheral surfaces of the punch 31 and the first pad 32 corresponding to the curved portion 22a is 100 mm. The curvature radius R2 of the outer peripheral surfaces of the wrinkle presser 33 and the second pad 34 corresponding to the curved portion 22a is 90 mm. The separation distance S0 between the punch 31 and the second pad 34 shown in FIG. 13B was 100 mm. The chamfer radius R3 of the upper end corner of the punch 31 was 10 mm, and the chamfer radius R4 of the lower end corner of the second pad 34 was 10 mm.

First, as shown in FIGS. 5 and 13 (a), the boundary portion 11a of the base 11 of the blank 1 is sandwiched and restrained by the punch 31 and the first pad 32, and the outer portion (flange) of the deformable portion 12 is fixed. The portion 12b is restrained by being sandwiched between the wrinkle presser 33 and the second pad 34.
Next, by moving the wrinkle presser 33 and the second pad 34 along the arrow C in FIG. 5, the portion 12 a serving as the vertical wall portion was rotated along the arrow A in FIG. 5. As shown in FIG. 14B, this rotation was performed until the distance S between the punch 31 and the second pad 34 was 10 mm. Thereby, the part 12a used as the vertical wall part of the blank 1 was shear-deformed, and the vertical wall part 22 was formed. Fig.14 (a) is a top view of the metal mold | die and blank in this state, FIG.14 (b) is the AA sectional drawing. The height T of the vertical wall portion 22 in FIG. 14B was 100 mm.
In this example, the shear deformation process was performed at room temperature using an unheated blank.
The resulting curved channel parts were evaluated for wrinkles generated as shown in Table 2.

その結果、サンプルNo.1-1については、使用したブランクの材質がいずれの場合でも、しわについては○（品質上問題とならない程度の微少なしわ）であった。

As a result, for sample No. 1-1, regardless of the blank material used, the wrinkle was ○ (a fine wrinkle that would not cause a quality problem).

<Sample No.1-2>
The vertical wall portion 22 and the flange portion 24 continuous with the curved channel part 2 shown in FIG. 3 were produced by the same method as Sample No. 1-1 except for the following points.
In this example, the wrinkle crushing step was performed by sandwiching the vertical wall portion 22 between the punch 31 and the second pad 34 from the state of FIG.
The resulting curved channel part was evaluated for wrinkles generated based on Table 2. As a result, the wrinkle was 使用 (no wrinkles by visual inspection) regardless of the blank material used.

<Sample No. 1-3>
The vertical wall portion 22 and the flange portion 24 continuous with the curved channel part 2 shown in FIG. 3 were produced by the same method as Sample No. 1-1 except for the following points.
In this example, the shear deformation process was performed using a blank heated to 300 ° C.
The resulting curved channel part was evaluated for wrinkles generated based on Table 2. As a result, the wrinkle was 使用 (no wrinkles by visual inspection) regardless of the blank material used.

<Sample No.1-4>
The vertical wall portion 22 and the flange portion 24 continuous with the curved channel part 2 shown in FIG. 3 were produced by the same method as Sample No. 1-1 except for the following points.
In this example, the shear deformation process was performed using a blank heated to 300 ° C. Further, from the state of FIG. 14B, the vertical wall portion 22 is further sandwiched between the punch 31 and the second pad 34 to perform the crushing process.
For each of the obtained curved channel parts, the generated wrinkles were evaluated based on Table 2. As a result, the wrinkle was 使用 (no wrinkles by visual inspection) regardless of the blank material used.

<Sample No.2-1>
The vertical wall portion 22 of the curved channel component 2 shown in FIG. 3 and the flange portion 24 continuous thereto are formed only by the shear deformation step by the method of the second embodiment shown in FIG.
The same mold as Sample No. 1-1 was used except that the moving mechanism of the wrinkle presser 33 and the second pad 34 was different. The separation distance S0 between the punch 31 and the second pad 34 shown in FIG. 13B was 100 mm.
First, the boundary side portion 11a of the base portion 11 of the blank 1 is sandwiched and restrained by the punch 31 and the first pad 32, and the outer portion (portion serving as a flange portion) 12b of the deformable portion 12 is The two pads 34 were sandwiched and restrained.

Next, the wrinkle presser 33 and the second pad 34 were linearly moved along the arrow C as shown in FIG. At that time, the movement angle (θ) with respect to the plate surface of the blank 1 was set to 30 °. This movement was performed until the distance S between the punch 31 and the second pad 34 became 10 mm, as shown in FIG. Thus, the vertical wall portion 22 was formed by shearing and deforming the portion 12a serving as the vertical wall portion. Fig.14 (a) is a top view of the metal mold | die and blank in this state, FIG.14 (b) is the AA sectional drawing. The height T of the vertical wall portion 22 in FIG. 14B was 100 mm.
In this example, the shear deformation process was performed at room temperature using an unheated blank.
The resulting curved channel part was evaluated for wrinkles generated based on Table 2. As a result, regardless of the blank material used, the wrinkle was ○ (a fine wrinkle that does not cause a problem in quality).

<Sample No.2-2>
The vertical wall portion 22 of the curved channel part 2 and the flange portion 24 continuous with the curved channel component 2 shown in FIG. 3 were produced by the same method as Sample No. 2-1, except for the following points.
In this example, the wrinkle crushing step was performed by sandwiching the vertical wall portion 22 between the punch 31 and the second pad 34 from the state of FIG.
The resulting curved channel part was evaluated for wrinkles generated based on Table 2. As a result, the wrinkle was 使用 (no wrinkles by visual inspection) regardless of the blank material used.

<Sample No.2-3>
The vertical wall portion 22 of the curved channel part 2 and the flange portion 24 continuous with the curved channel component 2 shown in FIG. 3 were produced by the same method as Sample No. 2-1, except for the following points.
In this example, the shear deformation process was performed using a blank heated to 300 ° C.
The resulting curved channel part was evaluated for wrinkles generated based on Table 2. As a result, the wrinkle was 使用 (no wrinkles by visual inspection) regardless of the blank material used.

<Sample No.2-4>
The vertical wall portion 22 of the curved channel part 2 and the flange portion 24 continuous with the curved channel component 2 shown in FIG. 3 were produced by the same method as Sample No. 2-1, except for the following points.
In this example, the shear deformation process was performed using a blank heated to 300 ° C. Further, from the state of FIG. 14B, the vertical wall portion 22 is further sandwiched between the punch 31 and the second pad 34 to perform the crushing process.
The resulting curved channel part was evaluated for wrinkles generated based on Table 2. As a result, the wrinkle was 使用 (no wrinkles by visual inspection) regardless of the blank material used.

<Sample No.3-1>
The vertical wall portion 22 of the curved channel part 2 and the flange portion 24 continuous with the curved channel component 2 shown in FIG. 3 were produced by the same method as Sample No. 2-1, except for the following points.
As shown in FIG. 6, the angle (θ) for linearly moving the wrinkle presser 33 and the second pad 34 along the arrow C was set to 45 °.
The resulting curved channel part was evaluated for wrinkles generated based on Table 2. In sample No. 2-1, regardless of the blank material used, the wrinkle was ○ (a fine wrinkle that does not cause quality problems).

<Sample No.3-2>
The vertical wall portion 22 and the flange portion 24 continuous to the curved channel part 2 shown in FIG. 3 were produced by the same method as Sample No. 2-2 except for the following points.
As shown in FIG. 6, the angle (θ) for linearly moving the wrinkle presser 33 and the second pad 34 along the arrow C was set to 45 °.
The resulting curved channel part was evaluated for wrinkles generated based on Table 2. As a result, the wrinkle was 使用 (no wrinkles by visual inspection) regardless of the blank material used.

<Sample No.3-3>
A vertical wall portion 22 and a flange portion 24 continuous to the vertical wall portion 22 of the curved channel part 2 shown in FIG. 3 were produced by the same method as Sample No. 2-3 except for the following points.
The degree (θ) was 45 °.
The resulting curved channel part was evaluated for wrinkles generated based on Table 2. As a result, the wrinkle was 使用 (no wrinkles by visual inspection) regardless of the blank material used.

<Sample No.3-4>
A vertical wall portion 22 and a flange portion 24 continuous to the vertical wall portion 22 of the curved channel component 2 shown in FIG. 3 were produced by the same method as Sample No. 2-4 except for the following points.
As shown in FIG. 6, the angle (θ) for linearly moving the wrinkle presser 33 and the second pad 34 along the arrow C was set to 45 °.
The resulting curved channel part was evaluated for wrinkles generated based on Table 2. As a result, the wrinkle was 使用 (no wrinkles by visual inspection) regardless of the blank material used.

<Sample No.4-1>
The vertical wall portion 22 of the curved channel part 2 and the flange portion 24 continuous with the curved channel component 2 shown in FIG. 3 were produced by the same method as Sample No. 2-1, except for the following points.
As shown in FIG. 6, the angle (θ) for linearly moving the wrinkle presser 33 and the second pad 34 along the arrow C was set to 60 °.
The resulting curved channel part was evaluated for wrinkles generated based on Table 2. In sample No. 2-1, regardless of the blank material used, the wrinkle was ○ (a fine wrinkle that does not cause quality problems).

<Sample No.4-2>
The vertical wall portion 22 and the flange portion 24 continuous to the curved channel part 2 shown in FIG. 3 were produced by the same method as Sample No. 2-2 except for the following points.
As shown in FIG. 6, the angle (θ) for linearly moving the wrinkle presser 33 and the second pad 34 along the arrow C was set to 60 °.
The resulting curved channel part was evaluated for wrinkles generated based on Table 2. As a result, the wrinkle was 使用 (no wrinkles by visual inspection) regardless of the blank material used.

<Sample No.4-3>
A vertical wall portion 22 and a flange portion 24 continuous to the vertical wall portion 22 of the curved channel part 2 shown in FIG. 3 were produced by the same method as Sample No. 2-3 except for the following points.
As shown in FIG. 6, the angle (θ) for linearly moving the wrinkle presser 33 and the second pad 34 along the arrow C was set to 60 °.
The resulting curved channel part was evaluated for wrinkles generated based on Table 2. As a result, the wrinkle was 使用 (no wrinkles by visual inspection) regardless of the blank material used.

<Sample No.4-4>
A vertical wall portion 22 and a flange portion 24 continuous with the vertical wall portion 22 of the curved channel part 2 shown in FIG. 3 were produced by the same method as Sample No. 2-4 except for the following points.
As shown in FIG. 6, the angle (θ) for linearly moving the wrinkle presser 33 and the second pad 34 along the arrow C was set to 60 °.
The resulting curved channel part was evaluated for wrinkles generated based on Table 2. As a result, the wrinkle was 使用 (no wrinkles by visual inspection) regardless of the blank material used.

<Sample No.5-1>
The vertical wall portion 22 of the curved channel part 2 and the flange portion 24 continuous with the curved channel component 2 shown in FIG. 3 were produced by the same method as Sample No. 2-1, except for the following points.
As shown in FIG. 6, the angle (θ) for linearly moving the wrinkle presser 33 and the second pad 34 along the arrow C was set to 20 °.
The resulting curved channel part was evaluated for wrinkles generated based on Table 2. As a result, the wrinkle was x (prominent wrinkle) regardless of the blank material used.

<Sample No.5-2>
The vertical wall portion 22 and the flange portion 24 continuous to the curved channel part 2 shown in FIG. 3 were produced by the same method as Sample No. 2-2 except for the following points.
As shown in FIG. 6, the angle (θ) for linearly moving the wrinkle presser 33 and the second pad 34 along the arrow C was set to 20 °.
The resulting curved channel part was evaluated for wrinkles generated based on Table 2. As a result, the wrinkle was x (prominent wrinkle) regardless of the blank material used.

<Sample No.5-3>
A vertical wall portion 22 and a flange portion 24 continuous to the vertical wall portion 22 of the curved channel part 2 shown in FIG. 3 were produced by the same method as Sample No. 2-3 except for the following points.
As shown in FIG. 6, the angle (θ) for linearly moving the wrinkle presser 33 and the second pad 34 along the arrow C was set to 20 °.
The resulting curved channel part was evaluated for wrinkles generated based on Table 2. As a result, the wrinkle was x (prominent wrinkle) regardless of the blank material used.

<Sample No.5-4>
A vertical wall portion 22 and a flange portion 24 continuous to the vertical wall portion 22 of the curved channel component 2 shown in FIG. 3 were produced by the same method as Sample No. 2-4 except for the following points.
As shown in FIG. 6, the angle (θ) for linearly moving the wrinkle presser 33 and the second pad 34 along the arrow C was set to 20 °.
The resulting curved channel part was evaluated for wrinkles generated based on Table 2. As a result, the wrinkle was x (prominent wrinkle) regardless of the blank material used.

<Sample No. 6-1>
The vertical wall portion 22 of the curved channel part 2 and the flange portion 24 continuous with the curved channel component 2 shown in FIG. 3 were produced by the same method as Sample No. 2-1, except for the following points.
As shown in FIG. 6, the angle (θ) for linearly moving the wrinkle presser 33 and the second pad 34 along the arrow C was set to 70 °.
The resulting curved channel part was evaluated for wrinkles generated based on Table 2. As a result, the wrinkle was x (prominent wrinkle) regardless of the blank material used.

<Sample No.6-2>
The vertical wall portion 22 and the flange portion 24 continuous to the curved channel part 2 shown in FIG. 3 were produced by the same method as Sample No. 2-2 except for the following points.
As shown in FIG. 6, the angle (θ) for linearly moving the wrinkle presser 33 and the second pad 34 along the arrow C was set to 70 °.
The resulting curved channel part was evaluated for wrinkles generated based on Table 2. As a result, the wrinkle was x (prominent wrinkle) regardless of the blank material used.

<Sample No. 6-3>
A vertical wall portion 22 and a flange portion 24 continuous to the vertical wall portion 22 of the curved channel part 2 shown in FIG. 3 were produced by the same method as Sample No. 2-3 except for the following points.
As shown in FIG. 6, the angle (θ) for linearly moving the wrinkle presser 33 and the second pad 34 along the arrow C was set to 70 °.
The resulting curved channel part was evaluated for wrinkles generated based on Table 2. As a result, the wrinkle was x (prominent wrinkle) regardless of the blank material used.

<Sample No. 6-4>
A vertical wall portion 22 and a flange portion 24 continuous to the vertical wall portion 22 of the curved channel component 2 shown in FIG. 3 were produced by the same method as Sample No. 2-4 except for the following points.
As shown in FIG. 6, the angle (θ) for linearly moving the wrinkle presser 33 and the second pad 34 along the arrow C was set to 70 °.
The resulting curved channel part was evaluated for wrinkles generated based on Table 2. As a result, the wrinkle was x (prominent wrinkle) regardless of the blank material used.

<Sample No.7-1>
The vertical wall portion 22 of the curved channel part 2 shown in FIG. 3 and the flange portion 24 continuous therewith are subjected to a two-step process in which a shear deformation step is performed after a drawing step by the method of the fifth embodiment shown in FIG. Formed.
The mold used in the drawing process is obtained by replacing the second pad 34 with a die 37 in the mold shown in FIG. The chamfer radius of the lower end corner portion of the die 37 is 10 mm, which is the same as the chamfer radius R4 of the lower end corner portion of the second pad 34 of the mold shown in FIG. The distance L between the punch 31 and the die 37 was 87 mm.

  First, as shown in FIG. 9A, the boundary side portion 11 a of the base portion 11 of the blank 1 is sandwiched and restrained by the punch 31 and the first pad 32, and the outer portion 12 d of the deformed portion 12 of the blank 1. Was installed between the crease presser 32 and the die 37. Next, a drawing process of moving the crease presser 32 and the die 37 by 50 mm in the B direction while applying tension to the outer portion 12d was performed. This drawing process was performed until the angle β between the portion 12a serving as the vertical wall portion and the side surface of the die 37 reached 60 °. Thereby, height T1 of the part 12a used as a vertical wall part was 50 mm.

Next, the die 37 is replaced with the second pad 34, and the wrinkle presser 32 and the second pad 34 are connected to the same moving mechanism as used in sample No. 2-1, as shown in FIG. 9B. The outer portion 12 d of the deformed portion 12 of the blank 1 was restrained between the wrinkle presser 32 and the second pad 34. The separation distance S0 between the punch 31 and the second pad 34 was 87 mm.
Next, the wrinkle presser 33 and the second pad 34 were linearly moved along the arrow C, with the angle θ with respect to the plate surface of the portion 12a serving as the vertical wall portion of the blank 1 being 60 °. This movement was performed until the distance S between the punch 31 and the second pad 34 became 10 mm. Thus, the vertical wall portion 22 was formed by shearing and deforming the portion 12a serving as the vertical wall portion. The height T2 of the vertical wall portion 22 in FIG. 9B was 100 mm.

In this example, the shear deformation process was performed at room temperature using an unheated blank.
The resulting curved channel part was evaluated for wrinkles generated based on Table 2. As a result, in sample No. 7-1, the wrinkle was ○ (a fine wrinkle that does not cause a quality problem) regardless of the blank material used.

<Sample No.7-2>
A vertical wall portion 22 and a flange portion 24 continuous with the vertical wall portion 22 of the curved channel component 2 shown in FIG. 3 were produced by the same method as Sample No. 7-1 except for the following points.
In this example, the wrinkle crushing process was performed by sandwiching the vertical wall portion 22 between the punch 31 and the second pad 34 from the state of FIG. 9B.
The resulting curved channel part was evaluated for wrinkles generated based on Table 2. As a result, the wrinkle was 使用 (no wrinkles by visual inspection) regardless of the blank material used.

<Sample No.7-3>
A vertical wall portion 22 and a flange portion 24 continuous with the vertical wall portion 22 of the curved channel component 2 shown in FIG. 3 were produced by the same method as Sample No. 7-1 except for the following points.
In this example, the shear deformation process was performed using a blank heated to 300 ° C.
The resulting curved channel part was evaluated for wrinkles generated based on Table 2. As a result, the wrinkle was 使用 (no wrinkles by visual inspection) regardless of the blank material used.

<Sample No.7-4>
A vertical wall portion 22 and a flange portion 24 continuous with the vertical wall portion 22 of the curved channel component 2 shown in FIG. 3 were produced by the same method as Sample No. 7-1 except for the following points.
In this example, the shear deformation process was performed using a blank heated to 300 ° C. Further, from the state of FIG. 9B, the vertical wall portion 22 is further sandwiched between the punch 31 and the second pad 34 to perform the crushing process.
The resulting curved channel part was evaluated for wrinkles generated based on Table 2. As a result, the wrinkle was 使用 (no wrinkles by visual inspection) regardless of the blank material used.

<Sample No. 8-1>
The vertical wall portion 22 of the curved channel part 2 shown in FIG. 3 and the flange portion 24 continuous therewith are subjected to a two-step process in which a drawing process is performed after a shear deformation process is performed by the method of the fourth embodiment shown in FIG. Formed.
In the shear deformation process, the same mold as that used in Sample No. 2-1 was used, and the separation distance S0 between the punch 31 and the second pad 34 was set to 50 mm.
First, as shown in FIG. 8A, the boundary side portion 11a of the base 11 of the blank 1 is sandwiched and restrained by the punch 31 and the first pad 32, and the outer portion of the deformed portion 12 (becomes a flange portion). (Part) 12 b was sandwiched and restrained by the wrinkle presser 33 and the second pad 34. Next, with θ = 45 °, the shear deformation process was performed by linearly moving the wrinkle presser 33 and the second pad 34 along the arrow C. This shear deformation process was performed at room temperature using an unheated blank until the height T1 of the inner portion 12c of the blank 1 was 50 mm.

Next, as shown in FIG. 8 (b), the second pad 34 is replaced with a die 37, and the die 37 and the wrinkle presser 33 are connected to a drawing forming moving mechanism, and the die 37 and the wrinkle presser 33 are interposed between them. The outer part 12b of the blank 1 was installed. Next, a drawing process of moving the die 37 and the crease presser 33 by 50 mm in the B direction while applying tension to the outer portion 12b was performed. This drawing process was performed until the height T2 of the vertical wall portion 22 reached 100 mm.
The resulting curved channel part was evaluated for wrinkles generated based on Table 2. As a result, for sample No. 8-1, regardless of the blank material used, the wrinkle was ○ (a fine wrinkle that would not cause a quality problem).

<Sample No.8-2>
The vertical wall portion 22 of the curved channel component 2 and the flange portion 24 continuous with the curved channel component 2 shown in FIG. 3 were produced by the same method as Sample No. 8-1 except for the following points.
In this example, the wrinkle crushing process was performed by sandwiching the vertical wall portion 22 between the punch 31 and the second pad 34 from the state of FIG.
The resulting curved channel part was evaluated for wrinkles generated based on Table 2. As a result, the wrinkle was 使用 (no wrinkles by visual inspection) regardless of the blank material used.

<Sample No. 8-3>
The vertical wall portion 22 of the curved channel component 2 and the flange portion 24 continuous with the curved channel component 2 shown in FIG. 3 were produced by the same method as Sample No. 8-1 except for the following points.
In this example, the shear deformation process was performed using a blank heated to 300 ° C.
The resulting curved channel part was evaluated for wrinkles generated based on Table 2. As a result, the wrinkle was 使用 (no wrinkles by visual inspection) regardless of the blank material used.

<Sample No.8-4>
The vertical wall portion 22 of the curved channel component 2 and the flange portion 24 continuous with the curved channel component 2 shown in FIG. 3 were produced by the same method as Sample No. 8-1 except for the following points.
In this example, the shear deformation process was performed using a blank heated to 300 ° C. Further, from the state of FIG. 8B, the vertical wall portion 22 is further sandwiched between the punch 31 and the second pad 34 to perform the wrinkle crushing process.
The resulting curved channel part was evaluated for wrinkles generated based on Table 2. As a result, the wrinkle was 使用 (no wrinkles by visual inspection) regardless of the blank material used.

<Sample No.9-1>
The vertical wall portion 22 of the curved channel component 2 shown in FIG. 3 and the flange portion 24 continuous thereto are formed only by the drawing process.
Fig.15 (a) is a top view of the metal mold | die and blank used, and FIG.15 (b) is the AA sectional drawing.
The mold used in the press molding is the same as a conventional drawing mold, and includes a die 51, a punch 52, and a wrinkle presser 53. A radius of curvature R1 of a portion corresponding to the curved portion 22a of the inner peripheral surface 51a of the concave portion of the die 51 is 100 mm. The depth F of the concave portion of the die 51 is 100 mm. The radius of curvature R2 of the portion corresponding to the curved portion 22a of the outer peripheral surface 52a of the punch 52 is 90 mm.

The distance K between the inner peripheral surface 51a of the die 51 and the outer peripheral surface 52a of the punch 52 was 10 mm. The chamfer radius R3 of the upper end corner of the punch 52 was 10 mm, and the chamfer radius R4 of the lower end corner of the inner peripheral surface 51a of the die 51 was 10 mm.
First, as shown in FIG. 15, wrinkle pressers 53 were disposed on both sides of the punch 52, and the blank 1 was disposed thereon. The base 11 of the blank 1 was placed on the punch 52, and the deformed portion 12 was placed on the wrinkle presser 53. Next, the die 51 was installed above the blank 1 and the die 51 was lowered. At that time, an appropriate tension was applied to the convex portion 51 b of the die 51 and the deformed portion 12 of the blank 1 pressed by the wrinkle presser 53. This drawing process was performed at room temperature.

  Thus, as shown in FIG. 16, the deformed portion 12 of the blank 1 is bent between the concave portion of the die 51 and the punch 52, and as shown by the arrow B, between the convex portion 51 b of the die 51 and the wrinkle presser 53. Is moved to the punch 52 side, and the material largely drawn between the punch 52 and the die 51 forms the vertical wall portion 22. By performing this drawing process, the curved channel part 2 in which the height T of the vertical wall portion 22 is 100 mm was obtained.

The resulting curved channel part was evaluated for wrinkles generated based on Table 2. As a result, for wrinkles, the blank material used was “270” and “aluminum alloy”: ○ (a fine wrinkle that does not cause quality problems), otherwise x (a remarkable wrinkle). there were.
That is, in this example, when a high-strength 590, 980, 1180 MPa class steel plate was used as a blank, remarkable wrinkles occurred in the vertical wall portion and cracks occurred in the flange portion.

<Sample No. 9-2>
A vertical wall portion 22 and a flange portion 24 continuous to the vertical wall portion 22 of the curved channel component 2 shown in FIG. 3 were produced by the same method as Sample No. 9-1 except for the following points.
In this example, the drawing process was performed using a blank heated to 300 ° C.
The resulting curved channel part was evaluated for wrinkles generated based on Table 2. As a result, wrinkles were evaluated as x (prominent wrinkles) when the blank material used was “980” and “1180”, and ○ (small wrinkles that would not cause quality problems) in other cases. It was.

<Sample No. 10-1>
The curved channel component 4 shown in FIG. 10 was formed in two steps by performing a foam molding step after performing a shear deformation step by the method of the sixth embodiment shown in FIG.
In the shear deformation process, the same mold as that used in Sample No. 2-1 was used, and the separation distance S0 between the punch 31 and the second pad 34 was set to 50 mm.
First, as shown in FIG. 11A, the boundary side portion 11 a of the base portion 11 of the blank 1 is sandwiched and restrained by the punch 31 and the first pad 32, and becomes an outer portion (a flange portion) of the deformable portion 12. (Part) 12 b was sandwiched and restrained by the wrinkle presser 33 and the second pad 34. Next, a shear deformation process was performed in which the wrinkle presser 33 and the second pad 34 that restrain the outer portion 12b are linearly moved along the arrow C at θ = 45 °.

In this state, the portion 12a which becomes the vertical wall portion is an inclined wall portion, and the outer portion 12b is a flange portion. This shear deformation process was performed at room temperature using an unheated blank until the height T1 of the inclined wall portion was 25 mm.
Next, as shown in FIG. 11 (b), the wrinkle presser 33 and the second pad 34 that restrain the outer portion 12b are removed, and the portion (inclined wall portion) 12a that becomes the vertical wall portion of the blank 1 and A die 37 was installed on the outer portion (flange portion) 12b. Next, the foam forming process was performed by moving the die 37 along the arrow B. Thereby, the bent part of the part 12b and the inclined wall part 12a which became the flange part transiently was extended, and the vertical wall part 42 was formed. The height T2 of the vertical wall portion 42 in FIG. 11B was 100 mm.
The resulting curved channel part was evaluated for wrinkles generated based on Table 2. As a result, regardless of the blank material used, the wrinkle was ○ (a fine wrinkle that does not cause a problem in quality).

<Sample No. 10-2>
A curved channel component 4 shown in FIG. 10 was produced by the same method as Sample No. 10-1, except for the following points.
In this example, the wrinkle crushing process was performed by sandwiching the vertical wall portion 42 between the punch 31 and the die 37 from the state of FIG.
The resulting curved channel part was evaluated for wrinkles generated based on Table 2. As a result, the wrinkle was 使用 (no wrinkles by visual inspection) regardless of the blank material used.

<Sample No. 10-3>
A curved channel component 4 shown in FIG. 10 was produced by the same method as Sample No. 10-1, except for the following points.
In this example, the shear deformation process was performed using a blank heated to 300 ° C.
The resulting curved channel part was evaluated for wrinkles generated based on Table 2. As a result, the wrinkle was 使用 (no wrinkles by visual inspection) regardless of the blank material used.

<Sample No. 10-4>
A curved channel component 4 shown in FIG. 10 was produced by the same method as Sample No. 10-1, except for the following points.
In this example, the shear deformation process was performed using a blank heated to 300 ° C. Further, from the state of FIG. 11 (b), the wrinkle crushing step was performed by sandwiching the vertical wall portion 42 between the punch 31 and the die 37.
The resulting curved channel part was evaluated for wrinkles generated based on Table 2. As a result, the wrinkle was 使用 (no wrinkles by visual inspection) regardless of the blank material used.

<Sample No. 11-1>
The curved channel component 4 shown in FIG. 10 was produced only by foam molding.
A mold obtained by removing the wrinkle presser 53 from the mold shown in FIG. 15 used in sample No. 9-1 is used, and the base 11 of the blank 1 is placed on the punch 52, and then the die 51 is placed above the blank 1. The vertical wall portion 42 was formed by bending the deformed portion 12 of the blank 1 by lowering the die 51.

The resulting curved channel part was evaluated for wrinkles generated based on Table 2. As a result, for wrinkles, the blank material used was “270” and “aluminum alloy”: ○ (a fine wrinkle that does not cause quality problems), otherwise x (a remarkable wrinkle). there were.
That is, in this example, when a 270 MPa grade steel plate was used as a blank, there was no problem in wrinkle evaluation, but necking occurred at the end of the vertical wall portion. When a high-strength 590, 980, 1180 MPa grade steel plate was used as a blank, wrinkles occurred in the vertical wall portion.

<Sample No. 11-2>
A curved channel component 4 shown in FIG. 10 was produced by the same method as Sample No. 11-1, except for the following points.
In this example, the foam molding process was performed using a blank heated to 300 ° C.
The resulting curved channel part was evaluated for wrinkles generated based on Table 2. As a result, the wrinkle was x (remarkable wrinkle) when the material of the blank used was “980” or “1180”, and it was ○ (small wrinkle that would not cause quality problems) in other cases. .

<Sample No.12-1>
The vertical wall portion 22 of the curved channel part 2 and the flange portion 24 continuous with the curved channel component 2 shown in FIG. 3 were produced by the same method as Sample No. 2-1, except for the following points. As shown in FIG. 7, the angle (θ) for linearly moving the wrinkle presser 33 and the second pad 36 along the arrow C was set to 45 °.
The resulting curved channel part was evaluated for wrinkles generated based on Table 2. In sample No. 10-1, regardless of the blank material used, the wrinkle was ◎ (no wrinkle by visual inspection).

<Sample No.12-2>
The vertical wall portion 22 and the flange portion 24 continuous to the curved channel part 2 shown in FIG. 3 were produced by the same method as Sample No. 2-2 except for the following points. As shown in FIG. 7, the angle (θ) for linearly moving the wrinkle presser 33 and the second pad 36 along the arrow C was set to 45 °.
The resulting curved channel part was evaluated for wrinkles generated based on Table 2. As a result, the wrinkle was 使用 (no wrinkles by visual inspection) regardless of the blank material used.

<Sample No.12-3>
A vertical wall portion 22 and a flange portion 24 continuous to the vertical wall portion 22 of the curved channel part 2 shown in FIG. 3 were produced by the same method as Sample No. 2-3 except for the following points. As shown in FIG. 7, the angle (θ) for linearly moving the wrinkle presser 33 and the second pad 36 along the arrow C was set to 45 °.
Regarding the obtained curved channel part, the generated cracks and wrinkles were evaluated based on Table 2. As a result, the wrinkle was 使用 (no wrinkles by visual inspection) regardless of the blank material used.

<Sample No.12-4>
A vertical wall portion 22 and a flange portion 24 continuous to the vertical wall portion 22 of the curved channel component 2 shown in FIG. 3 were produced by the same method as Sample No. 2-4 except for the following points. As shown in FIG. 7, the angle (θ) for linearly moving the wrinkle presser 33 and the second pad 36 along the arrow C was set to 45 °.
The resulting curved channel part was evaluated for wrinkles generated based on Table 2. As a result, the wrinkle was 使用 (no wrinkles by visual inspection) regardless of the blank material used.

<Sample No. 13-1>
The vertical wall portion 42 of the curved channel part shown in FIG. 10 was formed by two methods of performing a foam forming step after performing a shear deformation step by the method of the sixth embodiment shown in FIG.
In the shear deformation process, the same mold as that used in Sample No. 2-1 was used, and the separation distance S0 (see FIG. 8A) between the punch 31 and the second pad 34 was set to 50 mm. First, as shown in FIG. 8A, the boundary side portion 11a of the base 11 of the blank 1 is sandwiched and restrained by the punch 31 and the first pad 32, and the outer portion of the deformed portion 12 (becomes a flange portion). (Part) 12 b was sandwiched and restrained by the wrinkle presser 33 and the second pad 34. Next, with θ = 45 °, the wrinkle presser 33 and the second pad 34 were linearly moved along the arrow C to perform a shear deformation step. This shear deformation process was performed at room temperature using an unheated blank until the height T1 of the inner portion 12c of the blank 1 was 50 mm.

Next, as shown in FIG. 11B, the second pad 34 and the wrinkle retainer 33 that restrain the outer portion 12b are removed, and the die is placed on the portion 12a that becomes the vertical wall portion and the outer portion 12b. 37 was installed. Next, a foam forming process was performed in which the die 37 was moved along the arrow B to extend the bent portion and form the vertical wall portion 42. This foam molding process was performed until the height T2 of the vertical wall portion 22 reached 100 mm.
The resulting curved channel part was evaluated for wrinkles generated based on Table 2. As a result, regardless of the blank material used, the wrinkle was ○ (a fine wrinkle that does not cause a problem in quality).

<Sample No. 13-2>
A vertical wall portion 42 of the curved channel part shown in FIG. 10 was produced by the same method as Sample No. 11-1, except for the following points. In this example, the wrinkle crushing process was performed by sandwiching the vertical wall portion 22 between the punch 31 and the die 37 from the state of FIG.
The resulting curved channel part was evaluated for wrinkles generated based on Table 2. As a result, the wrinkle was 使用 (no wrinkles by visual inspection) regardless of the blank material used.

<Sample No. 13-3>
A vertical wall portion 42 of the curved channel part shown in FIG. 10 was produced by the same method as Sample No. 11-1, except for the following points. In this example, the shear deformation process was performed using a blank heated to 300 ° C.
The resulting curved channel part was evaluated for wrinkles generated based on Table 2. As a result, the wrinkle was 使用 (no wrinkles by visual inspection) regardless of the blank material used.

<Sample No. 13-4>
A vertical wall portion 42 of the curved channel part shown in FIG. 10 was produced by the same method as Sample No. 11-1, except for the following points. In this example, the shear deformation process was performed using a blank heated to 300 ° C. Further, from the state of FIG. 11 (b), the wrinkle crushing step was performed by sandwiching the vertical wall portion 42 between the punch 31 and the die 37.

The resulting curved channel part was evaluated for wrinkles generated based on Table 2. As a result, the wrinkle was 使用 (no wrinkles by visual inspection) regardless of the blank material used.
These results are shown in Tables 3 to 5 below. Table 3 summarizes the results of No. 1-1 to No. 9-2 in which curved channel parts having flange portions were produced. Table 4 summarizes the results of No. 10-1 to No. 11-2 in which curved channel parts having no flange portion were produced. Table 5 summarizes the results of No. 12-1 to No. 13-4.

これらの結果から以下のことが分かる。
サンプルNo.1-1〜No.4-4では縦壁部の形成工程として、前記構成（３）または（４）の方法を採用している。よって、縦壁部を剪断変形工程のみで形成する場合は、前記構成（３）または（４）の方法を採用することで、全ての材料でしわの評価が良好な湾曲チャンネル部品を得ることができる。

From these results, the following can be understood.
In samples No. 1-1 to No. 4-4, the method of the above configuration (3) or (4) is adopted as the vertical wall forming step. Therefore, in the case where the vertical wall portion is formed only by the shear deformation process, by adopting the method of the above configuration (3) or (4), it is possible to obtain a curved channel component having an excellent evaluation of wrinkles with all materials. it can.

In samples No. 5-1 to No. 6-4, as the step of forming the vertical wall portion, the angle (θ) of the restrained outer portion with respect to the plate surface of the blank is 20 ° or 70 ° (30 A method of linearly moving in a direction that deviates from the range of 60 ° to 60 ° is employed.
Therefore, wrinkles generated in the vertical wall during the shear deformation process are removed even if the blank is heated and / or crushed (No. 5-2 to 5-4, No. 6-2 to 6-4). could not.

However, even in these cases, the vertical wall portion is not formed only by the shear deformation force, but the vertical wall portion is formed by allowing the material to flow by applying an appropriate tension to the portion to be the vertical wall portion. It is possible to obtain a curved channel part in which wrinkle is improved by suppressing flange deformation and wrinkles are improved.
Here, in the above-described embodiment, the blank was heated to 300 ° C. <Sample Nos. 1-3, 1-4, 2-3, 2-4, 3-3, 3-4, 4-3,4-4, 7-3, 7-4, 8-3, 8- For 4,10-3,10-4,13-3,13-4>, the heating temperatures were 600 ° C., 700 ° C., 900 ° C., and 1000 ° C., respectively. As a result, the same results as described above were obtained.

  In addition, the curved channel parts obtained by heating the blank to 1100 ° C. and performing the shear deformation process were superior to the conventional method in the evaluation of wrinkles, but the surface of the molded product was made of iron called scale. A thick oxide film was formed. Since a thick scale hinders welding and electrodeposition coating, it requires removal steps such as pickling, polishing, and shot blasting, which is not preferable from the viewpoint of manufacturing cost.

DESCRIPTION OF SYMBOLS 1 Blank 11 Blank base part 11b Center part of base part 11a Boundary side part of base part 12 Blank deformed part 12a Part to be deformed part vertical wall part 12b Outer part of deformed part 2 Curved channel component 21 Top plate part 22 Vertical wall part 22a Curved portion of vertical wall portion 24 Flange portion 24a Curved portion of flange portion 4 Curved channel component 41 Top plate portion 42 Vertical wall portion 42a Curved portion of vertical wall portion

Claims (11)

When a flat plate-shaped workpiece having a base and a deformed portion including a portion that is continuous with the base and becomes a vertical wall is bent at least at the boundary between the base and the vertical wall, the convex portion projects toward the base. A press molding method for press molding to a press molded part in which the vertical wall portion having a curved portion curved in a shape is formed,
As a process of forming the vertical wall portion,
A portion of the base portion on the boundary side with the deforming portion and an outer portion of the deforming portion are separately restrained, and a portion to be the vertical wall portion of the deforming portion is shear-deformed within a plate surface, thereby A press molding method, comprising: a shear deformation step of causing a material flow from the bending portion toward a portion away from the bending portion at an outer edge portion of a portion serving as a wall portion. In the step of forming the vertical wall portion, as viewed from the plate thickness direction of the flat plate-shaped workpiece,
The second constraining part is bent as the boundary part is bent from the state in which the second constraining part constraining the outer part of the deforming part is separated from the first constraining part constraining the boundary side part. The press forming method according to claim 1, wherein the first restraint portion and the second restraint portion are relatively moved in a direction in which a separation distance is reduced.   In the shear deformation step, the constrained outer portion is moved so that a portion that becomes the vertical wall portion rotates around a bending point of the bending portion on a boundary line between the base portion and the deformation portion. The press molding method according to claim 2, wherein the press molding method is performed.   The shear deformation step is performed by linearly moving the constrained outer portion in a direction in which an angle with respect to a plate surface of the workpiece is 30 ° or more and 60 ° or less. The press molding method as described.   The press molding method according to any one of claims 1 to 4, wherein a drawing process is performed after the shear deformation process as the forming process of the vertical wall portion.   The press forming method according to any one of claims 1 to 4, wherein, as the forming step of the vertical wall portion, the shear deformation step is performed after the drawing forming step. The press-molded part does not have a flange part outside the vertical wall part,
The press molding method according to any one of claims 1 to 4, wherein a foam molding step is performed after the shear deformation step as the vertical wall portion forming step.   8. The method according to claim 1, further comprising a wrinkle extending step of extending wrinkles generated in the vertical wall portion by sandwiching the vertical wall portion with a mold after the shear deformation step. The press molding method according to 1.   The press molding method according to claim 8, wherein unevenness for increasing the line length of the vertical wall portion is formed on the press surface of the mold that comes into contact with the surface of the vertical wall portion.   The press molding method according to any one of claims 1 to 9, wherein the shear deformation step is performed on a blank heated to 300 ° C or higher and 1000 ° C or lower. When a flat plate-shaped workpiece having a base and a deformed portion including a portion that is continuous with the base and becomes a vertical wall is bent at least at the boundary between the base and the vertical wall, the convex portion projects toward the base. A method of manufacturing a press-molded part that is press-molded into a press-molded part in which the vertical wall part having a curved part that curves in a shape is formed,
As a process of forming the vertical wall portion,
A portion of the base portion on the boundary side with the deforming portion and an outer portion of the deforming portion are separately restrained, and a portion to be the vertical wall portion of the deforming portion is shear-deformed within a plate surface, thereby A method for producing a press-molded part, comprising: a shear deformation step of causing a material flow from the bending portion toward a portion away from the bending portion at an outer edge portion of a portion serving as a wall portion.

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