WO2023229025A1 - Dispositif de pressage à chaud, procédé de production d'article moulé pressé à chaud et article moulé pressé à chaud - Google Patents

Dispositif de pressage à chaud, procédé de production d'article moulé pressé à chaud et article moulé pressé à chaud Download PDF

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Publication number
WO2023229025A1
WO2023229025A1 PCT/JP2023/019628 JP2023019628W WO2023229025A1 WO 2023229025 A1 WO2023229025 A1 WO 2023229025A1 JP 2023019628 W JP2023019628 W JP 2023019628W WO 2023229025 A1 WO2023229025 A1 WO 2023229025A1
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WIPO (PCT)
Prior art keywords
hot press
plate
recess
mold
press
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PCT/JP2023/019628
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English (en)
Japanese (ja)
Inventor
雅寛 斎藤
泰弘 伊藤
裕之 田上
淳一郎 鈴木
奨 湯浅
博司 吉田
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日本製鉄株式会社
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Application filed by 日本製鉄株式会社 filed Critical 日本製鉄株式会社
Publication of WO2023229025A1 publication Critical patent/WO2023229025A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
    • B21D22/20—Deep-drawing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
    • B21D22/20—Deep-drawing
    • B21D22/26—Deep-drawing for making peculiarly, e.g. irregularly, shaped articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D24/00—Special deep-drawing arrangements in, or in connection with, presses

Definitions

  • the present disclosure relates to a hot press apparatus, a method for manufacturing a hot press molded product, and a hot press molded product.
  • Patent Document 1 discloses a reinforcing material for a bumper that is provided with a small recess and a large recess surrounding the small recess for the purpose of increasing the peak load and increasing the amount of energy absorption. ing.
  • Such skeleton members are required to be lightweight and have sufficient load capacity. Furthermore, in recent years, with stricter collision safety standards for vehicles such as automobiles and stricter fuel efficiency regulations, there has been a demand for high-strength and lightweight members. In order to meet such demands, development of lightweight frame members using so-called high-strength materials having high tensile strength is underway.
  • Patent Document 2 discloses a technique for press-molding a plate material into a hat-shaped molded product having an uneven top surface.
  • Patent Document 2 discloses a technique for press-molding a plate material into a hat-shaped molded product having an uneven top surface.
  • the unevenness on the top surface of the molded product and the shoulder portion adjacent to the top surface are molded at the same time, these moldings interfere with each other, making it difficult to mold.
  • the unevenness on the top surface of the molded product is formed in advance, the unevenness is restrained with a punch and a die pad, and then the shoulder portion of the molded product is formed with the punch and die.
  • the key point of Patent Document 2 is not to perform two moldings at the same time.
  • the present disclosure has been made in view of the above.
  • the present disclosure provides a hot press device capable of suppressing the reduction in thickness and necking of a recessed portion of a hot press molded product formed by a die pad, a method for manufacturing a hot press molded product using the device, and a method for manufacturing a hot press molded product using the device, and a method for manufacturing a hot press molded product using the device. It is an object of the present invention to provide a hot press-formed product in which reduction in plate thickness at concave portions and necking are suppressed.
  • a hot press device includes: Equipped with punch, die and die pad,
  • the top surface of the punch has a groove, In a cross section along the press direction, the angle between the wall surface of the groove and the press direction is 2 to 8 degrees, There is a refrigerant flow path inside the punch,
  • the die and the die pad are arranged to face the punch in the pressing direction, the die pad is disposed facing the top surface of the punch;
  • the die pad has a convex portion at a position facing the groove in the pressing direction, and the convex portion has a shape that is an inversion of the groove.
  • the die has a step portion in contact with the die pad in the pressing direction, The die pad may be in contact with the die in the pressing direction at the bottom dead center of molding.
  • the angle between the press direction and a straight line connecting the rounded end of the side ridgeline portion of the wall surface of the groove and the rounded end of the bottom side ridgeline portion may be 2 to 8 degrees.
  • a method for manufacturing a hot press-formed product according to one embodiment of the invention according to the present disclosure A method for producing a hot press-formed product using the hot press apparatus according to any one of (1) to (3) above, placing a blank between the die and the punch; sandwiching the blank between the punch and the die pad; It is characterized by including the step of bringing the punch and the die closer to the pressing direction to the bottom dead center of the molding.
  • the hot press-formed product of one embodiment of the invention according to the present disclosure is A press-molded product comprising a first plate portion in which a recess is formed and a second plate portion inclined with respect to the first plate portion, A direction perpendicular to the side part of the recess and the plate surface of the first plate part in a cross-sectional view in a plane where the cross-sectional line length of the recess is the shortest among the planes passing through the point where the depth of the recess is the deepest.
  • the angle between the two is 2 to 8 degrees
  • the thickness of the thinnest portion of the recessed portion is 60% or more of the thickness of the portion of the first plate portion excluding the recessed portion.
  • the angle between the straight line connecting the rounded end of the side ridgeline part of the side part of the recess and the rounded end of the bottom side ridgeline part and the direction perpendicular to the plate surface of the first plate part is 2. It may be ⁇ 8°.
  • a hot press device capable of suppressing reduction in plate thickness and necking of a concave portion of a hot press molded product formed by a die pad, a method for manufacturing a hot press molded product using the device, and press forming. It is possible to provide a hot press-formed product in which reduction in plate thickness at the concave portion of the product and necking are suppressed.
  • FIG. 1 is a schematic perspective view of a hot press-formed product according to an embodiment of the present disclosure.
  • FIG. 2 is a schematic cross-sectional end view of the hot press-formed product of FIG. 1 in a direction along the Z coordinate axis.
  • FIG. 3 is an enlarged schematic cut-away end view of the hot press-formed product of FIG. 2 in the vicinity of a recess.
  • FIG. 1 is a schematic perspective view of a hot press apparatus according to an embodiment of the present disclosure.
  • FIG. 5 is a schematic cross-sectional end view of the hot press apparatus shown in FIG. 4 taken along the cross-sectional line AA in a direction along the Z coordinate axis.
  • FIG. 2 is a schematic cut-part end view for explaining a hot press apparatus used in a method for manufacturing a hot press-formed product according to an embodiment of the present disclosure, and is a diagram showing a state in which a workpiece is placed. .
  • FIG. 2 is a schematic cut-part end view for explaining a hot press apparatus used in a method for manufacturing a hot press-formed product according to an embodiment of the present disclosure, and is a diagram showing a state in which a recess is formed in a workpiece. be.
  • It is a schematic cut-part end view for explaining the hot press apparatus used for the manufacturing method of the hot press molded product based on one Embodiment of this indication, and is a figure which shows the state where press forming is completed.
  • FIG. 1 is a schematic cut-part end view for explaining a hot press apparatus used in a method for manufacturing a hot press-formed product according to an embodiment of the present disclosure, and is a diagram showing a state in which a recess is formed in
  • FIG. 7 is a schematic cut-away end view for explaining a hot press apparatus used in a method for manufacturing a hot press-formed product according to another embodiment of the present disclosure.
  • FIG. 7 is a schematic cut-part end view for explaining a hot press apparatus used in a method for manufacturing a hot press-formed product according to another embodiment of the present disclosure, and is a diagram showing a state in which press forming has been completed.
  • FIG. 7 is a schematic cut-away end view for explaining a hot press apparatus used in a method for manufacturing a hot press-formed product according to another embodiment of the present disclosure.
  • FIG. 2 is a schematic cut-away end view for explaining a recessed portion of a hot press-formed product according to an embodiment of the present disclosure.
  • FIG. 1 is a schematic cut-away end view of a hot press apparatus according to an embodiment of the present disclosure.
  • FIG. 2 is a schematic cut-away end view of a hot press-formed product according to an embodiment of the present disclosure.
  • FIG. 7 is a diagram for explaining a modified example of the recess according to an embodiment of the present disclosure, and is a schematic cut-away end view showing the vicinity of the recess of a hot press-formed product.
  • FIG. 7 is a diagram for explaining a modified example of the recess according to an embodiment of the present disclosure, and is a schematic cut-away end view showing the vicinity of the recess of a hot press-formed product.
  • FIG. 7 is a schematic plan view for explaining a modification of the recessed portion of the hot press-formed product according to the present disclosure.
  • FIG. 7 is a schematic plan view for explaining a modification of the recessed portion of the hot press-formed product according to the present disclosure.
  • FIG. 7 is a schematic plan view for explaining a modification of the recessed portion of the hot press-formed product according to the present disclosure.
  • FIG. 7 is a schematic plan view for explaining a modification of the recessed portion of the hot press-formed product according to the present disclosure.
  • FIG. 7 is a schematic plan view for explaining a modification of the recessed portion of the hot press-formed product according to the present disclosure.
  • FIG. 7 is a schematic plan view for explaining a modification of the recessed portion of the hot press-formed product according to the present disclosure.
  • FIG. 7 is a schematic plan view for explaining a modification of the recessed portion of the hot press-formed product according to the present disclosure.
  • FIG. 7 is a schematic plan view for explaining a modification of the
  • FIG. 1 is a perspective view of a hot press-formed product 100, including a cut plane perpendicular to the longitudinal direction of the long hot press-formed product 100 at a central position in the longitudinal direction. This cut surface is also a cross section along the press direction P.
  • the hot press-formed product 100 according to the present embodiment is a long hot press-formed product 100, and includes a first plate portion extending in the longitudinal direction of the hot press-formed product 100. 110, a second plate part 120 that extends in the longitudinal direction of the hot press-formed product 100 and is inclined with respect to the first plate part 110, and smoothly connects the first plate part 110 and the second plate part 120.
  • the hot press-formed product 100 is a long member, and has a longitudinal direction and a transversal direction perpendicular to the longitudinal direction.
  • the longitudinal direction is the direction in which the hot press-formed product 100, which is a long member, extends.
  • the longitudinal direction of the hot press-formed product 100 and the Z coordinate axis are parallel.
  • the X coordinate axis and the Y coordinate axis in FIG. 1 constitute a plane including the lateral direction of the hot press-formed product 100.
  • the X, Y, and Z coordinate axes in FIG. 1 are orthogonal to each other.
  • the portion of the first plate portion 110 excluding the recessed portion 140 has a substantially flat plate shape and extends in the longitudinal direction of the hot press-formed product 100.
  • the portion of the first plate portion 110 excluding the recess 140 has a first plate surface 110a and a first plate surface 110b opposite to the first plate surface 110a.
  • the first plate part 110 extends in the length direction of the first plate part 110.
  • the second plate portion 120 is a substantially flat portion and extends in the longitudinal direction of the hot press-formed product 100.
  • the second plate portion 120 has a second plate surface 120a and a second plate surface 120b opposite to the second plate surface 120a.
  • the second plate part 120 extends in the length direction of the second plate part 120.
  • the second plate part 120 is in the width direction of the second plate part 120. extends to In the example of FIG. 1, the hot press-formed product 100 has a pair of second plate portions 120.
  • the ridgeline portion 130 is a portion that smoothly connects the first plate portion 110 and the second plate portion 120, and extends in the longitudinal direction of the hot press-formed product 100. Since the second plate part 120 is inclined with respect to the first plate part 110, the ridgeline part 130 connecting them is curved in a cross-sectional view perpendicular to the longitudinal direction of the hot press-formed product 100. It has a shape. When the second plate part 120 is inclined with respect to the first plate part 110, it means that the plate surface of the first plate part 110 and the plate surface of the second plate part 120 are not parallel. Further, the direction parallel to the longitudinal direction of the hot press-formed product 100 is defined as the longitudinal direction of the ridgeline portion 130.
  • the curved outer surface of the ridgeline portion 130 is defined as a ridgeline outer surface 130a
  • the curved inner surface of the ridgeline portion 130 is defined as a ridgeline inner surface 130b.
  • the first plate surface 110a and the second plate surface 120a are connected to the ridge outer surface 130a
  • the first plate surface 110b and the second plate surface 120b are connected to the ridge inner surface 130b.
  • One edge (first plate edge 110A) of the first plate portion 110 extending in the longitudinal direction of the hot press-formed product 100 is a ridgeline portion 130 extending in the longitudinal direction of the hot press-formed product 100. (ridgeline edge 130A).
  • second plate edge 120A One edge (second plate edge 120A) of the second plate part 120 extending in the longitudinal direction of the hot press-formed product 100 is connected to the other edge (the ridge line) extending in the longitudinal direction of the ridgeline part 130. edge 130B).
  • the hot press-formed product 100 has a pair of ridgeline portions 130.
  • a recess 140 is provided in the first plate portion 110.
  • the recess 140 extends in the length direction of the recess 140.
  • the recessed portion 140 may extend through the longitudinal center of the hot press-formed product 100 and along the ridgeline portion 130.
  • the center position in the longitudinal direction of the hot press-formed product 100 is a range of 20% of the longitudinal length of the hot press-formed product 100 from the center position that equally divides the longitudinal length of the hot press-formed product 100 into two. means the position included in When the recessed portion 140 extends along the ridgeline portion 130, it means that the recessed portion 140 is arranged substantially parallel to a portion of the adjacent ridgeline portion 130.
  • a flange portion may be formed on the edge portion extending in the longitudinal direction that is not connected to the ridgeline portion 130.
  • the first plate portion 110, the second plate portion 120, or the flange portion may be provided with a hole, a notch, a welded portion, or the like. Further, the second plate portion 120 or the flange portion may be provided with a bead.
  • FIG. 2 shows a cross-sectional end view of the hot press-formed product 100 in the longitudinal direction of the hot press-formed product 100 shown in FIG.
  • the recessed portion 140 is recessed in a direction perpendicular to the plate surface of the first plate portion 110, as will be described later. In the example of FIG. 2, the recessed portion 140 is recessed toward the side where the second plate portion 120 is located with respect to the first plate portion 110 (the first plate surface 110b side).
  • the recess 140 has a bottom 141, a pair of side parts 142, a bottom side ridgeline part 143, and a side side ridgeline part 144.
  • the bottom portion 141 of the recess is connected to each side portion 142 at each end via a pair of bottom side ridgeline portions 143 .
  • Each side portion 142 is connected to the first plate portion 110 via a side edge portion 144 .
  • the bottom portion 141 , the side portions 142 , the bottom edge portion 143 , and the side edge portion 144 extend in the length direction of the recess 140 .
  • the bottom 141 of the recess 140 has a bottom inner surface 141a located inside the recess 140 (on the side 142 side) and a bottom outer surface 141b opposite to the bottom inner surface 141a. That is, the bottom inner surface 141a constitutes a part of the inner surface of the recess 140.
  • FIG. 3 shows an enlarged view of the vicinity of the recess 140 of the hot press-formed product 100 of FIG. 2.
  • one of the boundaries between the first plate part 110 and the recessed part 140 (the boundary between the first plate part 110 and the side edge part 144) is defined as a boundary gb1, and the other Let the boundary be a boundary gb2.
  • the boundary gb1 and the boundary gb2 on a plane orthogonal to the longitudinal direction of the hot press-formed product 100 are defined by the side ridgeline portion 144.
  • the recessed portion 140 is a portion of the first plate portion 110 that is recessed toward the side where the second plate portion 120 is located (the first plate surface 110b side).
  • the recessed portion 140 may be a portion of the first plate portion 110 that is recessed on the side opposite to the side where the second plate portion 120 is located (the first plate surface 110a side). That is, the recess provided in the first plate portion 110 may be recessed toward the ridgeline outer surface 130a side (outside the hot press-formed product 100) or the ridgeline inner surface 130b side (inside the hot press-formed product 100).
  • the width w of the recess 140 is defined as the distance between the recess boundary gb1 and the recess boundary gb2 in a plane perpendicular to the longitudinal direction of the hot press-formed product 100.
  • the width w of the recess 140 may not be constant in the longitudinal direction of the hot press-formed product 100.
  • the width w of the recess 140 should be 10 mm to 52 mm because it can improve the compressive axial force performance in the direction along the Z coordinate axis and the moment bending performance in the direction along the X coordinate axis as shown in FIG. 1 etc. is preferred.
  • the width w of the recess 140 is preferably smaller than the length of the recess 140 in the extending direction.
  • the direction connecting the boundaries gb1 at both ends of the hot press-formed product 100 is defined as the longitudinal direction.
  • FIG. 4 shows an example of a press device (hot press device) used in the method for manufacturing a hot press-formed product according to the present embodiment.
  • the press apparatus 1000 shown in FIG. 4 includes a first mold 1100, a second mold 1200, and a third mold 1300 as press molds.
  • the first mold 1100 and the second mold 1200 are movable relative to each other in the press direction P.
  • a workpiece (blank) is sandwiched between the first mold 1100 and the second mold 1200.
  • the third mold 1300 is arranged adjacent to the first mold 1100 in the direction along the X coordinate axis, and is movable relative to the first mold 1100 and the second mold 1200.
  • the third mold 1300 is movable relative to the first mold 1100 and the second mold 1200 in the press direction P. Furthermore, a coolant flow path (not shown) is provided inside the second mold 1200 of the press apparatus 1000.
  • the press direction P in the press apparatus 1000 is the negative direction of the Y coordinate axis.
  • the X, Y, and Z coordinate axes in FIG. 4 are orthogonal to each other.
  • FIG. 5 shows a schematic cross-sectional end view of the press device 1000 taken along the sectional line AA shown in FIG. 4 in the direction along the Z coordinate axis. Note that the end views in FIGS. 5 to 8 are cross-sectional views along the press direction P.
  • the first mold 1100 has a press surface 1110 and a convex portion 1120 provided on the press surface 1110.
  • the convex portion 1120 has a bottom portion 1121 and a pair of side portions 1122.
  • the bottom part 1121 is connected to each side part 1122 at each end via a pair of bottom part side ridgeline parts 1123.
  • the convex portion 1120 is convex toward the negative direction of the Y coordinate axis.
  • Each side surface portion 1122 is connected to a holding surface portion 1130 of the press surface 1110 excluding the convex portion 1120 via a side surface portion side ridgeline portion 1124.
  • the bottom part 1121, the side part 1122, the bottom part side ridge line part 1123, and the side part side ridge line part 1124 extend in the direction in which the convex part 1120 extends, that is, in the direction along the Z coordinate axis in FIG. 4.
  • the second mold 1200 has a press surface (top surface) 1210 and a groove portion (concave surface portion) 1220 provided on the press surface 1210. That is, the second mold 1200 has a groove 1220 on its top surface.
  • the groove portion 1220 has a bottom portion 1221, a pair of side portions 1222, a bottom side ridgeline portion 1223, and a sidewall side ridgeline portion 1224.
  • the bottom part 1221 is connected to each side part 1222 at each end via a pair of bottom part side ridgeline parts 1223.
  • the groove portion 1220 has a shape that is recessed toward the negative direction of the Y coordinate axis.
  • Each side surface portion 1222 is connected to a holding surface portion 1230 of the press surface 1210 excluding the groove portion 1220 via a side surface portion side ridgeline portion 1224.
  • the bottom surface portion 1221, the side surface portion 1222, the bottom surface portion side ridgeline portion 1223, and the side surface portion side ridgeline portion 1224 have a constant length, and have a fixed length in the direction in which the groove portion 1220 extends, that is, the direction along the Z coordinate axis in FIG. extends to
  • the second mold 1200 further includes a side wall portion 1250 connected to the holding surface portion 1230 via a shoulder surface portion 1240.
  • the shoulder surface portion 1240 is a portion that smoothly connects the holding surface portion 1230 and the side wall portion 1250, and the shoulder surface portion 1240 and the side wall portion 1250 are connected in the direction in which the press surface 1210 extends, that is, the direction along the Z coordinate axis in FIG. extends to
  • the convex part 1120 of the first mold 1100 and the groove part 1220 of the second mold 1200 have surface shapes corresponding to each other, and by sandwiching the workpiece between the first mold 1100 and the second mold 1200, A recess 140 is formed in the workpiece.
  • the convex portion 1120 has a shape that is an inversion of the groove portion 1220.
  • the holding surface portion 1130 of the first mold 1100 and the holding surface portion 1230 of the second mold 1200 are parallel to each other. In the example of this embodiment, the holding surface portion 1130 and the holding surface portion 1230 are perpendicular to the pressing direction P.
  • the first mold 1100 has a convex portion 1120 at a position facing the groove portion 1220 in the press direction P.
  • the wall surface of the groove 1220 has an angle of 2 to 8 degrees with respect to the press direction P. More specifically, in the cross section along the press direction P, the R end of the side ridgeline portion 1224 located on the side surface portion 1222 side and the R end of the bottom side ridgeline portion 1223 located on the side surface portion 1222 side. The angle between the straight line connecting the two and the press direction P is 2 to 8 degrees.
  • a cross section along the press direction P is a plane that passes through a point on the bottom surface part 1221 where the depth of the groove part 1220 of the second mold 1200 is the deepest in the entire groove part 1220, and the cross-sectional line length of the groove part 1220 is This is the shortest plane.
  • the depth of the groove 1220 is determined on a virtual plane that includes the shortest straight line connecting the boundary between the pair of side ridges 1224 and the holding surface 1230, and in which the cross-sectional line length of the groove 1220 is the shortest when viewed in cross section. , means the distance from the straight line to the bottom surface portion 1221 in the direction orthogonal to the straight line connecting these boundaries.
  • the cross-sectional line length of the groove portion 1220 can be measured by creating a 3D model of the second mold 1200 based on three-dimensional shape measurement and deriving a plane with the shortest cross-sectional line length.
  • the radius of curvature of the bottom side ridgeline portion 1223 is 3 mm to 30 mm.
  • the radius of curvature of the side ridgeline portion 1224 is 3 mm to 30 mm.
  • the radius of curvature of the side surface portion 1222 is greater than 30 mm, or the side surface portion 1222 is flat. Even if the side surface portion 1222 is curved within such a radius of curvature, the wall surface of the groove portion 1220 can be approximated to a straight line in the above cross section, and the press direction P forms a straight line connecting the R stops as described above.
  • the angle can be defined.
  • the third mold 1300 has a press surface 1310.
  • the press surface 1310 extends in a direction along the Z coordinate axis in FIG. 4 .
  • the first mold 1100 and the third mold 1300 are arranged to face the second mold 1200 in the press direction P.
  • the first mold 1100 is placed facing the top surface of the second mold 1200.
  • the third mold 1300 is connected to a slide plate 1400.
  • the first mold 1100 is connected to the slide plate 1400 via a support portion 1410 (spring or piston).
  • the third mold 1300 moves.
  • the first mold 1100 moves via the support section 1410.
  • the press device 1000 may be provided with a drive unit (not shown) that can drive each of the first mold 1100, the second mold 1200, and the third mold 1300 independently. Further, any one of the first mold 1100, the second mold 1200, and the third mold 1300 may be fixed to the press device 1000.
  • the first mold 1100 is a die pad
  • the second mold 1200 is a punch
  • the third mold 1300 is a die.
  • a method for manufacturing a hot press-formed product according to the present embodiment includes hot pressing a workpiece to form a press-formed product including a first plate portion in which a recess is formed. It is.
  • a workpiece (blank) 1 is placed between a first mold 1100 and a second mold 1200.
  • the first mold 1100 is located above the second mold 1200 in the vertical direction, and the workpiece 1 is placed on the holding surface portion 1230 of the second mold 1200.
  • the temperature of the workpiece 1 at the start of press-forming may be 600 to 800°C.
  • the above-described hot press apparatus has the effect of being able to mold a component while it is hot and has low deformation resistance.
  • the first mold 1100 and the second mold 1200 are moved relative to each other in the press direction P (lower side in the vertical direction) and brought close to each other.
  • the third mold 1300 may move together with the first mold 1100, or the third mold 1300 may not move.
  • a portion of the hot press-formed product 100 of the workpiece 1 corresponding to the first plate portion 110 is sandwiched between the first mold 1100 and the second mold 1200.
  • the first mold 1100 is further moved in the pressing direction P from the state where the convex portion 1120 of the first mold 1100 is in contact with the workpiece 1.
  • the workpiece 1 is sandwiched between the first mold 1100 and the second mold 1200, and the workpiece 1 is sandwiched between the convex part 1120 of the first mold 1100 and the groove part 1220 of the second mold 1200.
  • a recess 140 is formed in.
  • the pressing force when forming the recess 140 by the first mold 1100 and the second mold 1200 may be 0.4 to 22.0 MPa. More preferably, this pressing force may be 0.4 to 4.4 MPa. Thereby, it is possible to mold the workpiece while the deformation resistance is low, and furthermore, the molding load of the first mold 1100 can be set to the minimum load force, and the mold cost can be reduced.
  • the third mold 1300 is further moved to the bottom dead center, and as shown in FIG. 8, the workpiece 1 is sandwiched between the second mold 1200 and the third mold 1300, and A second plate portion 120 is formed between the mold 1300 and press molding is completed.
  • the first plate part 110, the second plate part 120, the ridgeline part 130, and the recessed part 140 are formed in the hot press-formed product 100.
  • a flange portion may be formed between the second mold 1200 and the third mold 1300.
  • the first mold 1100 may reach the bottom dead center before the third mold 1300 reaches the bottom dead center, and the third mold 1300 may reach the bottom dead center. At the same time as reaching the point, the first mold 1100 may reach the bottom dead center.
  • FIG. 9 illustrates a hot press apparatus used in a method for manufacturing a hot press molded product according to another embodiment of the present disclosure. Similar to FIG. 5, FIG. 9 is a schematic cross-sectional end view of the press device taken along the cross-sectional line AA shown in FIG. 4 in the direction along the Z coordinate axis. Note that the end views of the cut portion in FIGS. 9 to 11 are views taken in a cross section along the press direction P.
  • the press device 1000 shown in FIG. 9 has the same configuration as the press device 1000 shown in FIG. 5 etc., except that it includes a stepped portion 1320, so the description thereof will be omitted here. That is, the configuration of the press apparatus 1000 shown in FIGS. 4 to 8 described above can be applied to the press apparatus 1000 shown in FIG.
  • the step portion 1320 may extend in the direction along the Z coordinate axis. Note that in the example of FIG. 9, two third molds 1300 are shown in the X coordinate axis direction. These two third molds 1300 may be connected to each other in the X coordinate axis direction.
  • FIG. 10 shows a state in which a workpiece is sandwiched between the molds and the third mold 1300 is moved to the bottom dead center.
  • a workpiece is sandwiched between a second die 1200 and a third die 1300, a second plate part 120 is formed between the second die 1200 and the third die 1300, and the press Complete the molding.
  • the first plate part 110, the second plate part 120, the ridgeline part 130, and the recessed part 140 are formed in the hot press-formed product 100.
  • the third mold 1300 includes the stepped portion 1320, the first mold 1100 contacts the third mold 1300 in the press direction P at the bottom dead center of molding. This makes it possible to suppress necking even when the first mold 1100 is pressed against the third mold 1300 and the pressing force of the first mold 1100 is insufficient.
  • the support portion 1410 is deformed so as to contract in the pressing direction P.
  • FIG. 11 Another form of the press device 1000 is shown in FIG. 11.
  • the press device 1000 in FIG. 11 is also a schematic cross-sectional end view of the press device in the direction along the Z coordinate axis, taken along the cross-sectional line AA as shown in FIG. 4, similar to FIG. 5 and the like.
  • the third mold 1300 is provided only on one side. Further, the third mold 1300 includes a stepped portion 1320.
  • the first mold 1100 has a press surface 1140 on the opposite side from the third mold 1300 in the X-axis direction.
  • the press surface 1140 is provided so as to be connected to the press surface 1110 of the first mold 1100.
  • the press surface 1140 extends in a direction along the Z coordinate axis.
  • the press apparatus 1000 shown in FIG. 11 has the same configuration as the press apparatus 1000 shown in FIG. 9 except that the third mold 1300 is provided only on one side, so the description thereof will be omitted here. That is, the configuration of the press apparatus 1000 according to FIG. 9 can be applied to the press apparatus 1000 shown in FIG. 11. In the press apparatus 1000 of FIG. 11, the area where the pressurizing mechanism of the third mold 1300 on the upper side of the press apparatus 1000 can be arranged can be increased, so there is an advantage that the press load design can have a likelihood. be.
  • the ratio of the area of the recess 140 to the area of the first plate part 110 when viewed in plan in a direction perpendicular to the plate surface of the first plate part 110 is 30. % or more.
  • the direction perpendicular to the plate surface of the first plate part 110 is defined as a direction on a virtual plane that includes the shortest straight line connecting the boundary gb1 and the boundary gb2, and in which the cross-sectional line length of the recessed part 140 is the shortest when viewed in cross-section. , means the direction perpendicular to the straight line connecting the boundary gb1 and the boundary gb2.
  • the cross-sectional line length of the recess 140 can be measured by creating a 3D model of the hot press-formed product 100 based on three-dimensional shape measurement and deriving a plane with the shortest cross-sectional line length.
  • the three-dimensional shape measurement described in this embodiment can be performed using a 3D scanner such as Atos (manufactured by GOM).
  • the definitions of the area of the first plate portion 110 and the area of the recessed portion 140 are as described later.
  • press forming may be performed such that the maximum depth dmax of the depth d of the recess 140 in the press direction P is 15 mm or more.
  • the depth d of the recess 140 means the depth in the pressing direction P.
  • the pressing direction P is a direction perpendicular to the plate surface of the first plate portion 110.
  • the maximum depth dmax means the maximum value of the depth d of the recess 140 in the entire recess 140.
  • the depth of the recess 140 means the distance from the straight line in the direction perpendicular to the plate surface of the first plate part 110 described above to the bottom inner surface 141a. More preferably, the maximum depth dmax is 20 mm or more to further improve axial force and bending moment performance. More preferably, the upper limit of the maximum depth dmax is preferably 50 mm from the viewpoint of suppressing deterioration in productivity due to an increase in press stroke due to an increase in pad stroke.
  • the cross-sectional line length of the recess 140 is the shortest among the planes passing through the point pd where the depth d of the recess 140 is the deepest. Pressing is performed so that the angle ⁇ between the side portion 142 of the recess 140 and the pressing direction P is 2 to 8 degrees when viewed in cross section on a plane (a cross section taken in the pressing direction). More specifically, the side ridgeline portion 144 located on the side portion 142 side in the plane where the cross-sectional line length of the recess 140 is the shortest among the planes passing through the point pd where the depth d of the recess 140 is the deepest.
  • Pressing is performed so that the angle formed by the pressing direction P and the straight line connecting the rounded end of the bottom edge line portion 143 located on the side portion 142 side is 2 to 8°.
  • a plane that passes through the point pd where the depth d of the recess 140 is the deepest and where the cross-sectional line length of the recess 140 is the shortest is parallel to the pressing direction P.
  • the point pd at which the depth d of the recess 140 is the deepest is the point at which the depth d of the recess 140 becomes the maximum depth dmax in the entire recess 140.
  • the radius of curvature of the bottom side ridgeline portion 143 is 3 mm to 30 mm.
  • the radius of curvature of the side edge portion 144 is 3 mm to 30 mm.
  • the radius of curvature of side 142 is greater than 30 mm, or side 142 is flat. Even if the side portion 142 is curved within such a range of curvature radius, the side portion 142 can be approximated to a straight line in the above cross section, and the angle between the straight line connecting the R stops as described above and the press direction P. can be specified.
  • FIG. 12 shows an end view of a cut portion in a cross-sectional view on a plane where the cross-sectional line length of the recess 140 is the shortest among the planes passing through the point pd where the depth d of the recess 140 is the deepest.
  • FIG. 12 shows the hot press-formed product 100 placed on the press device 1000 after completion of press forming, and is an enlarged view of the vicinity of the recess 140 of the hot press-formed product 100.
  • the cross-sectional line length of the recess 140 means the line length along the inner surface of the recess 140 from the boundary gb1 to the boundary gb2 in a plane including the shortest straight line connecting the boundary gb1 and the boundary gb2.
  • the cross section defining the curve C corresponding to the shape of the recess 140 is the plane in which the cross-sectional line length of the recess 140 is the shortest among the planes passing through the point pd.
  • the curve C corresponds to the shape of the inner surface of the recess 140 in this cross section.
  • the curve C has a point iP1 and a point iP2, which are one end point of the side portion 142, between the boundary gb1 or the boundary gb2 and the point pd.
  • Point iP1 and point iP2 are also the rounded ends of the side ridgeline portion 144.
  • the processing of the recess 140 formed by the first mold 1100 can be made easier.
  • the angle ⁇ is 2° or more, there is an effect that the mold can be easily released after press molding. Furthermore, by setting the angle ⁇ to 8° or less, it is possible to reduce the portion of the workpiece 1 that is not in contact with the first mold 1100 or the second mold 1200 during molding with the first mold 1100. This reduces the number of areas where cooling does not proceed. If there are only a few areas where cooling does not progress, the thickness of the workpiece 1 will not locally decrease and lead to necking during forming, resulting in the ability to form parts without excessive thickness reduction or necking. be.
  • the slope of the side portion 142 matches the slope of the tangent ti1 or the slope of ti2.
  • the slope of the tangent ti1 or the slope of ti2 is the slope of the straight line connecting the round end of the side ridge line portion 144 located on the side portion 142 side and the round end of the bottom side ridge line portion 143 located on the side portion 142 side. matches.
  • the side parts 142 are drawn to have the same inclination with respect to the press direction P, but as long as the two side parts 142 satisfy the angle requirements with respect to the press direction P, The angles with respect to the direction P may be different from each other.
  • the ratio of the area of the recess 140 to the area of the first plate part 110 when viewed in plan in a direction perpendicular to the plate surface of the first plate part 110 is It may be 30% or more.
  • the area of the first plate part 110 is the area including the recess 140 and excluding the second plate part 120 and the ridgeline part 130 between the second plate part 120.
  • the area of the recessed portion 140 is the area from the boundary gb1 to the boundary gb2 when viewed in plan in a direction perpendicular to the plate surface of the first plate portion 110.
  • the area of the recessed portion 140 is 30% or more of the area of the first plate portion 110 when viewed from above in a direction perpendicular to the plate surface of the first plate portion 110, so that the area along the Z coordinate axis shown in FIG.
  • the effect is that the compressive axial force performance in the direction along the X coordinate axis and the moment bending performance in the direction along the X coordinate axis can be improved.
  • the area of the recessed portion 140 with respect to the area of the first plate portion 110 is 50% or more, since the axial force and bending moment performance can be further improved.
  • the area of the first plate part 110 is determined by the boundary between the ridgeline part 130 and the first plate part 110 and the longitudinal end of the first plate part 110 in a plan view in a direction perpendicular to the plate surface of the first plate part 110. Let it be the area of the range surrounded by.
  • the boundary between the first plate part 110 and the ridge line part 130 is determined by creating a 3D model of the hot press-formed product 100 based on three-dimensional shape measurement, and from this 3D model, the boundary between the first plate part 110 and the ridge line part 130. It can be identified by detecting.
  • the area of the recess 140 is the area of the range on the recess 140 side surrounded by the boundary between the side ridgeline part 144 and the first plate part 110.
  • the boundary between the first plate part 110 and the side ridge line part 144 is also determined by creating a 3D model of the hot press-formed product 100 based on three-dimensional shape measurement, and from this 3D model, the first plate part 110 and the side edge part 144 are It can be identified by detecting the boundary with the side ridgeline portion 144.
  • the maximum depth dmax of the recess 140 in the direction perpendicular to the plate surface of the first plate portion 110 may be 15 mm or more.
  • a maximum depth dmax of 15 mm or more it is possible to improve the compression axial force performance in the direction along the Z coordinate axis as shown in Fig. 1, and the moment bending performance in the direction along the X coordinate axis. It will be done.
  • the maximum depth dmax is 20 mm or more because it can further improve axial force and bending moment performance.
  • the depth d of the recess 140 is determined by the depth d between the boundary gb1 and the boundary gb2 on a virtual plane that includes the shortest straight line connecting the boundary gb1 and the boundary gb2 and where the cross-sectional line length of the recess 140 is the shortest when viewed in cross section. It means the distance from the straight line to the bottom inner surface 141a in the direction orthogonal to the straight line connecting.
  • the recess 140 in a cross-sectional view in a plane that passes through the point PD where the depth d of the recess 140 is the deepest and where the cross-sectional line length of the recess 140 is the shortest, the recess 140 is The angle between the side part 142 of the first plate part 110 and the direction perpendicular to the plate surface of the first plate part 110 is 2 to 8 degrees. Further, the thickness of the portion of the recess 140 where the thickness is the smallest is 60% or more of the thickness of the portion of the first plate portion 110 excluding the recess 140 .
  • the thickness of the portion of the first plate portion 110 excluding the recess 140 is defined as the average value of the thickness of any three points in the portion of the first plate portion 110 excluding the recess 140. Board thickness. Note that a plane that passes through the point pd where the depth d of the recess 140 is the deepest and where the cross-sectional line length of the recess 140 is the shortest is orthogonal to the plate surface of the first plate portion 110. According to the above-described manufacturing method, it is possible to suppress a reduction in the thickness of the recessed portion, so that in the hot press-formed product 100, the thickness of the portion of the recessed portion 140 where the thickness is the smallest is the same as that of the recessed portion 140 of the first plate portion 110. The thickness can be 60% or more of the plate thickness excluding the parts.
  • the hot press-formed product 100 deformation occurs when a load of a certain level or more is applied in a direction perpendicular to the longitudinal direction of the hot-press-formed product 100 or in the longitudinal direction of the hot press-formed product 100. arise. At this time, a tensile force or a compressive force is applied in a direction perpendicular to the direction in which the recess 140 extends.
  • the plate thickness at the part where the plate thickness is the smallest in the recess 140 is 60% or more of the plate thickness of the part of the first plate part 110 excluding the recess 140. 140 can improve the axial force and bending moment performance of the member.
  • the plate thickness of the first plate part 110 and the recessed part 140 is measured by creating a 3D model based on three-dimensional shape measurement of the hot press-formed product 100 as described above, and detecting the plate thickness from this 3D model. .
  • the average plate thickness t1 of the first plate portion 110 may be 0.8 to 2.6 mm.
  • the plate thickness of the workpiece 1 is measured at three or more locations from the 3D model, and the arithmetic mean value of the measured values of the plate thickness at these locations is set as the average plate thickness t1 of the workpiece 1.
  • the average plate thickness t1 of the first plate portion 110 is determined by the following method. In a plane orthogonal to the longitudinal direction of the hot press-formed product 100 at the central position in the longitudinal direction of the hot press-formed product 100, the plate thickness at any position of the first plate portion 110 excluding the recess 140 is calculated from the 3D model. Measure at more than one location. The arithmetic mean value of the measured values of the plate thickness at these locations is defined as the average plate thickness t1.
  • the average plate thickness t of the workpiece 1 may be 0.8 to 2.6 mm.
  • the plate thickness of the workpiece 1 is measured at three or more locations from the 3D model, and the arithmetic mean value of the measured values of the plate thickness at these locations is set as the average plate thickness t of the workpiece 1.
  • the convex portion 1120 of the first mold 1100 used in the method for manufacturing a hot press-formed product according to the present embodiment has a maximum distance in the pressing direction from the press surface 1110 to the convex portion 1120 of 15 mm or more. Good too.
  • the pressing direction intersects with the pressing surface 1110.
  • the maximum distance from the pressing surface 1110 to the convex portion 1120 in the pressing direction means the maximum distance from the holding surface portion 1130 to the convex portion 1120 in the pressing direction.
  • the surface shape of the convex portion 1120 is shown in cross-sectional view in a plane that passes through the point where the distance from the press surface 1110 of the first mold 1100 to the convex portion 1120 is the longest and where the cross-sectional line length of the convex portion 1120 is the shortest.
  • the side surface portion 1222 of the groove portion 1220 of the second mold 1200 has an angle of 2 to 8 degrees with respect to the pressing direction.
  • the press mold or press device used in the method for manufacturing a hot press-formed product according to the present disclosure is not limited to the configuration described above, and may be modified in various ways as long as it has a configuration that can perform the press forming described above. can be applied.
  • the press device 2000 may further include a fourth mold 2400. Similar to FIG. 5, FIG. 13 is a schematic cross-sectional end view of the press device 2000 taken along the longitudinal direction of the first mold 2100.
  • the configurations of the first mold 2100, the second mold 2200, and the third mold 2300 are as described above, and the fourth mold 2400 is connected to the second plate part 120 and the second plate part 120 during press molding.
  • the flange portion to be formed is processed while being held together with the third mold 2300.
  • the fourth mold 2400 it is possible to suppress the occurrence of wrinkles in the flange portion.
  • the third mold 2300 is connected to the slide plate 1400.
  • the first mold 2100 is connected to the slide plate 1400 via a support portion 1410 (spring or piston).
  • a recess 250 may further be provided. This has the effect of improving compression axial force performance in the direction along the Z coordinate axis and moment bending performance in the direction along the X coordinate axis as shown in FIG. 1 and the like.
  • the hot press-formed product 100 including the two second plate portions 120 was described as an example, but the hot press-formed product according to the present disclosure includes the first plate portion 110.
  • the second plate portion 120 may be provided only on one side.
  • the hot press-formed product 100 including the second plate portion 120 connected to the first plate portion 110 via the ridgeline portion 130 has been described, but the hot press-formed product according to the present disclosure is The second plate portion and the ridgeline portion may not be provided. That is, even in the case of the hot press-formed product 100 including the first plate portion 110 provided with the recessed portion 140, the effect of the present disclosure of suppressing the reduction in the thickness of the recessed portion 140 and necking can be obtained.
  • the hot press-formed product 100 is preferably a long member. That is, when viewed from above in a direction perpendicular to the plate surface of the first plate part 110, it is preferable that the size of the first plate part 110 in the longitudinal direction is larger than the size in the transverse direction. Further, the lengthwise size and the widthwise size of the first plate portion 110 may be the same.
  • the recessed portion 140 may be provided along the longitudinal direction of the first plate portion 110, or a portion of the recessed portion 140 may be provided along the transverse direction of the first plate portion 110. Alternatively, a part of the recess 140 may extend in a direction intersecting the longitudinal direction or the lateral direction of the first plate part 110.
  • the hot press-formed product 100 has a tensile strength of 1470 MPa or more.
  • the tensile strength of the hot press-formed product 100 is more preferably 2000 MPa or more because it has a higher yield stress.
  • the tensile strength of the hot press-formed product 100 is determined as follows. Specifically, from the first plate part 110 or the second plate part 120 of the hot press-formed product 100, a sample of a size conforming to either the JIS No. 5 tensile test, the JIS No. 13B tensile test, or the JIS No.
  • the 14B tensile test is obtained. Then, the tensile strength of this sample was measured using a universal testing machine or a hydraulic servo type strength testing machine according to a method according to JIS Z 2241, and this tensile strength was taken as the tensile strength of the hot press-formed product 100. . Note that if a test piece specified by JIS cannot be collected, a micro tensile test piece may be used as the sample. In the micro tensile test, the width and plate thickness of the parallel part are preferably 0.2 to 2.0 mm, and the test piece shape is preferably such that a uniform load is applied within the parallel part of the tensile test. Wire cut electric discharge machining is preferred for test piece machining.
  • micro-tensile test piece is, for example, the Journal of the Welding Society of Japan, Vol. 75 (2006), No. 6, pp. 461-465 (https://www.jstage.jst.go.jp/article/jjws/75/6/75_6_461/ _pdf/-char/ja) test piece can be adopted.
  • the hot press-formed product 100 according to the above embodiment preferably has a length in the longitudinal direction of 700 to 1700 mm, and the length in the width direction of the first plate portion 110 (from the first plate edge 110A to The length (to the other edge) is more preferably 30 to 200 mm. Further, in the hot press-formed product 100 according to the above embodiment, it is more preferable that the length of the second plate portion 120 in the width direction is 30 to 200 mm.
  • the recess has a V-shaped cross-sectional shape partially including a curve as shown in FIG. 15, or a cross-sectional shape consisting of a curve as shown in FIG. You can leave it there.
  • the recess 340 of the hot press-formed product 300 may have a bottom portion 341 and a pair of side portions 342 having a curved cross section.
  • the bottom portion 341 is connected to side portions 342, and each side portion 342 is connected to the first plate portion 310 via a side edge portion 344.
  • the first plate part 310 has a first plate part plate surface 310a and a first plate part plate surface 310b opposite to the first plate part plate surface 310a.
  • the bottom 341 has a bottom inner surface 341a located inside the recess 340 and a bottom outer surface 341b opposite to the bottom inner surface.
  • one of the boundaries between the first plate part 310 and the recessed part 340 (the boundary between the first plate part 310 and the side edge part 344) is defined as a boundary gb1, and the other Let the boundary be a boundary gb2.
  • the boundary gb1 and the boundary gb2 on the plane orthogonal to the longitudinal direction of the hot press-formed product 300 are points on the plate surface on the outside of the bending of the side ridgeline portion 344.
  • the width of the recess 340 is defined as the distance between the boundary gb1 and the boundary gb2 in a plane perpendicular to the longitudinal direction of the hot press-formed product 300. Note that also in the case of the shape shown in FIG. 15, the definition of the curve corresponding to the shape of the recess is the same as in the above embodiment.
  • the recess 440 does not have flat sides as illustrated in FIG. 3, but has a curved line corresponding to the shape of the inner surface of the recess 440.
  • the curve consists of a curved portion 441 and a curved portion 442, and the intersection of the curved portion 441 and the curved portion 442 is a point ip.
  • the shape of the first plate portion of the recessed portion of the press-formed product according to the present disclosure in plan view is not particularly limited. 17 to 23 illustrate modified examples of the recess provided in the first plate portion. In FIGS. 17 to 23, only the shape of the recess provided in the first plate portion is schematically shown.
  • the press-formed product according to the above embodiment is preferably used as a hot press-formed product for vehicles such as a front bumper reinforcement, a rear bumper reinforcement, a side sill outer, a side sill inner, a door impact beam, a front side member, a rear side member, etc. .
  • Example 1 In Example 1, a three-point bending test was conducted on a hot press-formed product having three recesses as shown in FIG. 14 in a simulation.
  • the plate thickness of the workpiece was 1.2 mm, and the tensile strength of the workpiece was 2000 MPa class.
  • the simulation conditions for the three-point bending test were three-point bending in which the center of the member was statically pressed down, and the thickness of the central concave portion of the member was determined from the forming simulation.
  • the span of the receiving jig for three-point bending was set to 1000 mm.
  • the area ratio of the recess was 40%, the maximum depth was 15 mm, and the width was 35 mm, and the angle between the side of the recess and the pressing direction during press molding was changed as shown in Table 1.
  • ta-tmin based on the arithmetic average ta of the plate thickness at any three points in the first plate part excluding the recessed part and the plate thickness tmin of the thinnest part in the recessed part.
  • the plate thickness reduction rate in the recessed portion can be calculated by dividing the reduced plate thickness at the portion where the plate thickness is reduced the most in the recessed portion by the plate thickness of the first plate portion in a simulation.
  • the yield strength of the member for evaluating the member performance was calculated from the simulation results of the three-point bending test.
  • the yield strength is the value obtained by dividing the load received from the test specimen by the impactor pressed down in the three-point bending test by the weight, and this is evaluated as the component performance.
  • the load in Table 1 is the load that the impactor receives from the test specimen, and the weight is the weight of the hot press-formed product.
  • FIG. 24 shows the results of this simulation. According to FIG. 24, it was confirmed that the plate thickness reduction rate could be suppressed by setting the angle of the side part of the recess to 8° or less with respect to the pressing direction. It was also found that high component performance of 7.96 kN/kg or more can be achieved by setting the side angle of the recess in the range of 2 to 8 degrees with respect to the pressing direction. It was also found that when the angle of the side part of the recess was 2° or more with respect to the pressing direction, the press-molded product could be easily released from the mold. From these results, those with good overall component performance evaluation were rated B (Good), and the others were rated C (Bad).
  • the angle between the side of the recess and the direction perpendicular to the plate surface of the first plate is the same as the angle between the side of the recess and the pressing direction. It was a value.
  • the angle of the side portion of the recess with respect to the pressing direction is defined as in the embodiment described above.
  • Example 2 In Example 2, a three-point bending test was conducted on a hot press-formed product having a shape having one recess as shown in FIG. 1 etc. in a simulation.
  • the plate thickness of the workpiece was 2.01 mm, and the tensile strength of the workpiece was 2000 MPa class.
  • the simulation conditions for the three-point bending test were three-point bending in which the center of the member was statically pressed down, and the thickness of the central concave portion of the member was determined from the forming simulation.
  • the span of the receiving jig for three-point bending was set to 1000 mm.
  • the area ratio of the recess is 35%, the maximum depth is 20 mm, and the width is 35 mm, and the angle between the side of the recess and the pressing direction during press forming is changed as shown in Table 2, and the plate thickness in the recess is reduced.
  • the ratio and component performance were investigated. The results are shown in Table 2.
  • the definition and calculation method of the plate thickness reduction rate in the recessed portion and the component performance are the same as in Example 1.
  • the definitions of loads and the like in Table 2 are the same as in Table 1.
  • FIG. 25 shows the results of this simulation. According to FIG. 25, it was confirmed that the plate thickness reduction rate could be suppressed by setting the angle of the side part of the recess to 8° or less with respect to the pressing direction. It was also found that when the angle of the side part of the recess is in the range of 2 to 8 degrees with respect to the pressing direction, high component performance of 7.50 kN/kg or higher, which is the target component performance, can be achieved. It was also found that when the angle of the side part of the recess was 2° or more with respect to the pressing direction, the press-molded product could be easily released from the mold. From these results, those with good overall component performance evaluation were rated B (Good), and the others were rated C (Bad).
  • Example 3 As shown in Table 3, the thickness of the workpiece, the number of recesses, the tensile strength of the workpiece, and the pad pressure during molding (the pressing force of the first mold) were varied, and the test specimen was subjected to a three-point bending test. This was done through simulation, and a comprehensive evaluation was made based on the member's strength performance and mold cost.
  • the cross-sectional dimensions were such that the height of the second plate part was 65 mm, the width of the first plate part was 100 mm, and the width of the recess was 40 mm and the depth was 23 mm.
  • the angle of the sides of the recess was 5° with respect to the pressing direction.
  • the first plate part When the number of recesses in the first plate part was one, it was arranged at the center in the width direction, and when there were two recesses, a shallow groove with a depth of 8 mm was provided between the recess at the center in the width direction and the second plate part.
  • Table 3 In this example, the span of the receiving jig for three-point bending was set to 1300 mm.
  • a hot press device capable of suppressing reduction in plate thickness and necking of a concave portion of a hot press molded product formed by a die pad, a method for manufacturing a hot press molded product using the device, and press forming. It is extremely useful industrially because it can provide a hot press-formed product in which reduction in plate thickness in the recessed part of the product and necking are suppressed.
  • Hot press-formed product 110 First plate part 120 Second plate part 130 Ridge line part 140 Recessed part 141 Bottom part 142 Side part 143 Bottom side ridge line part 144 Side side ridge line part 1000 Press device 1100 First mold (die pad) 1200 Second mold (punch) 1300 Third mold (die)

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)

Abstract

L'invention concerne un dispositif de pressage à chaud (1000) qui comprend un poinçon (1200), une matrice (1300) et un tampon de matrice (1100), et elle est caractérisée en ce que : une rainure (1220) est présente dans une surface supérieure (1210) du poinçon (1200), l'angle formé entre une surface de paroi de la rainure (1220) et la direction de pressage (P) dans une section transversale prise le long de la direction de pressage (P) étant de 2° à 8°, un canal de fluide frigorigène est présent à l'intérieur du poinçon (1200), la matrice (1300) et le tampon de matrice (1100) sont agencés de façon à faire face au poinçon (1200) dans la direction de pressage (P), le tampon de matrice (1100) faisant face à la surface supérieure (1210) du poinçon (1200), et une partie saillante (1120) est présente sur le tampon de matrice (1100) à une position qui est opposée à la rainure (1220) dans la direction de pressage (P), la partie saillante (1120) présentant la forme inverse de la rainure (1220).
PCT/JP2023/019628 2022-05-26 2023-05-26 Dispositif de pressage à chaud, procédé de production d'article moulé pressé à chaud et article moulé pressé à chaud WO2023229025A1 (fr)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5956927A (ja) * 1982-09-24 1984-04-02 Nissan Motor Co Ltd プレス型
WO2020111061A1 (fr) * 2018-11-28 2020-06-04 日本製鉄株式会社 Procédé de fabrication d'article formé à la presse, ensemble de plaques métalliques, dispositif de presse et ligne de presse
WO2021215391A1 (fr) * 2020-04-20 2021-10-28 豊田鉄工株式会社 Procédé de moulage à la presse pour composant allongé, et élément de montant de véhicule moulé à l'aide dudit procédé de moulage
JP6985989B2 (ja) * 2018-06-26 2021-12-22 株式会社神戸製鋼所 プレス成形品の製造方法

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5956927A (ja) * 1982-09-24 1984-04-02 Nissan Motor Co Ltd プレス型
JP6985989B2 (ja) * 2018-06-26 2021-12-22 株式会社神戸製鋼所 プレス成形品の製造方法
WO2020111061A1 (fr) * 2018-11-28 2020-06-04 日本製鉄株式会社 Procédé de fabrication d'article formé à la presse, ensemble de plaques métalliques, dispositif de presse et ligne de presse
WO2021215391A1 (fr) * 2020-04-20 2021-10-28 豊田鉄工株式会社 Procédé de moulage à la presse pour composant allongé, et élément de montant de véhicule moulé à l'aide dudit procédé de moulage

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