EP2754509B1 - Press forming method and press forming device - Google Patents

Press forming method and press forming device Download PDF

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Publication number
EP2754509B1
EP2754509B1 EP12830768.3A EP12830768A EP2754509B1 EP 2754509 B1 EP2754509 B1 EP 2754509B1 EP 12830768 A EP12830768 A EP 12830768A EP 2754509 B1 EP2754509 B1 EP 2754509B1
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EP
European Patent Office
Prior art keywords
shaped workpiece
punch
sheet shaped
die
press
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EP12830768.3A
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German (de)
English (en)
French (fr)
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EP2754509A4 (en
EP2754509A1 (en
Inventor
Hideto Katsuma
Shuji MORIIZUMI
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M's Inc
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M's Inc
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Publication of EP2754509A4 publication Critical patent/EP2754509A4/en
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Publication of EP2754509B1 publication Critical patent/EP2754509B1/en
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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
    • B21D24/00—Special deep-drawing arrangements in, or in connection with, presses
    • B21D24/04—Blank holders; Mounting means therefor
    • 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
    • B21D22/22—Deep-drawing with devices for holding the edge of the blanks

Definitions

  • the present invention relates to a press forming method and a press forming device for producing a press stamping product for which a high tensile stiffness is required, for example, a body panel of an automobile.
  • a drawing press forming method which is called a stretch-draw process is widely used.
  • This drawing press forming method is carried out as shown for example in Figure 12 such that a peripheral part of a sheet shaped workpiece P1 is gripped and constrained between an outer peripheral sandwiching part 82 of a die 81 secured to a ram 80 and a blank holder 84 elastically supported by a cushion pin 83, and the sheet shaped workpiece P1 as constrained is pressed between the die 81 and a punch 86 secured to a base 85 while being drawn by tension from the peripheral side thereof, thereby obtaining a press stamping product having a desired shape.
  • the blank holder 84 is made up of a ring-shaped integrated body surrounding the punch 86. Moreover, although the figure indicates that the die 81 is movable and located on the upper side, there may be a configuration in which up-and-down relationship is reversed, or a configuration in which the punch 86 is movable.
  • the press stamping product P obtained by such a drawing press forming method is generally configured, for example as schematically shown in Figure 13 , such that a product part A is surrounded by a sacrifice drawing part B and a sandwiching part C, in which the sacrifice drawing part B includes a bent part E which corresponds to a boundary portion of the forming surface 86a of the punch 86 with a peripheral edge part 86b, that is, a sloped peripheral wall part 86c (see Figure 12(a) ), and the sandwiching part C is formed with a groove shape G by concavo-convex fitting in a sandwiching surface between the outer peripheral sandwiching part 82 of the die 81 and the blank holder 84 to increase sandwiching force.
  • the product part A and the sacrifice drawing part B are expanded from the product corresponding part A1 and the sacrifice drawing corresponding part B1 in the sheet shaped workpiece P1, respectively due to the elongation effect during forming, and the sandwiching part C is also expanded from the sandwiching corresponding part C1 due to the formation of the groove shape G.
  • the sacrifice drawing part B and the sandwiching part C of the press stamping product P is eventually cut off and removed from the product part A, it is desirable to increase the proportion of the product corresponding portion making up the sheet shaped workpiece P1 as much as possible in the viewpoint of material yield.
  • the sandwiching corresponding part C1 needs to have a fixed width to ensure constraint force during forming, it is necessary to decrease the width of the sacrifice drawing corresponding part B1 in the sheet shaped workpiece P1 to improve the material yield.
  • JP2011110581 discloses a die and a method for forming an overhang in which both edge parts of a sheet-metal workpiece slide in the separating direction to each other and in the same direction as the direction in the extended surface of a forming surface of a punch or in an inclined direction to the side of the punch. JP2011110581 specifies that it is prevented that a sharp bent part and a longitudinal wall part are formed so as to hinder the extension of the formed part on the sheet-metal workpiece. JP2011110581 further specifies that because the formed part is satisfactorily extendable, the improvement of quality is attained and energy is efficiently spent to extend the formed part.
  • the present invention has its object to provide a press forming method and a press forming device which can significantly reduce the width of a sacrifice drawing corresponding part, thereby greatly improving the material yield upon producing a press stamping product such as a body panel of automobile from a sheet shaped workpiece, as well as effectively resolve strain of the shape of the punch due to actual cross-sectional length difference, thus allowing to obtain a high quality press stamping product having high tensile stiffness and surface quality due to an excellent forming stability, without producing tears and damages.
  • the press forming method according to the first aspect of the present invention may optionally be as specified in claim 2.
  • the press forming method according to the first aspect of the present invention may optionally be as specified in claim 3.
  • the press forming device according to the second aspect of the present invention may optionally be as specified in claim 5.
  • the press forming device according to the second aspect of the present invention may optionally be as specified in claim 6.
  • the press forming device according to the second aspect of the present invention may optionally be as specified in claim 7.
  • each blank holder 3 is displaced along a press axis direction to make the sheet shaped workpiece P1 superimposed on the forming surface 10 of the punch 11 in a process from when the sheet shaped workpiece P1 which is constrained at the peripheral part by the blank holder 3 comes into contact with a forming surface 10 of the punch 11 until when the workpiece is pressed between the punch 11 and the die 21, in this step, the sheet shaped workpiece P1 comes to fit with substantially the whole of the forming surface 10 of the punch 11 almost without decreasing the permissible amount of forming so that a three-dimensional shape of the forming surface 10 except the concave part 10a is transferred to the sheet shaped workpiece PI.
  • each blank holder 3 is displaced along the press axis direction to make the press stamping product P disengaged from the forming surface 10 of the punch 11 after the end of forming, and after both the sandwiching members 3a and 3b of the blank holder 3 are detached, or the press stamping product P is taken out after the detachment, both the sandwiching members 3a and 3b are displaced inwardly to be returned to the initial position before constraining of the sheet shaped workpiece P1; the press stamping product P maintains its formed shape at the time of expansion until it is separated from the forming surface 10 of the punch 11 and is freed from the constraint by the blank holder 3... so that the deformation of the press stamping product P by both the sandwiching members 3a and 3b is prevented.
  • the relative displacement along the press axis direction between the punch 11 and the blank holder 3 may be achieved by moving the punch 11 as a movable mold, or by moving the blank holder 3 as one body with the die 21 side, or separately.
  • a device which has a simple configuration and can efficiently and stably produce a high quality press stamping product P having a higher dimensional accuracy and a higher tensile stiffness, the device is configured such that in a process from when the peripheral part of the sheet shaped workpiece P1 is constrained between both the sandwiching members 3a and 3b of each blank holder 3 as the die 21 approaches the punch 11, and then the sheet shaped workpiece P1 is pressed against and superimposed on a forming surface 10 of the punch 11 until when the sheet shaped workpiece P1 is pressed between the punch 11 and the die 21, each blank holder 3 is displaced in the outward direction by the outward displacement means to expand the sheet shaped workpiece P1, and as the die 21 is separated from the punch 11 after the end of forming, each blank holder 3 is displaced along with the die 21 by resilient biasing of the holder support member 4, then the second sandwiching member 3b is displaced as one body with
  • each blank holder 3 since the inward displacement means of each blank holder 3 is configured such that only inwardly displacing the first sandwiching member 3a with a fluid pressure cylinder (an air cylinder 6) to return it to its initial position causes the second locking member 3b to be automatically displaced inwardly and returned to its initial position, when the die 21 makes action in the press axis direction for next press forming, the device configuration become simplified and functional compared to a case where a power mechanism for inward displacement for each of both the sandwiching members 3a and 3b is provided.
  • a fluid pressure cylinder an air cylinder 6
  • the blank holder 3 upon expanding the sheet shaped workpiece P1 with outward displacement means, first, the blank holder 3 is displaced in an obliquely outward direction with respect to the press axis direction, thereby allowing sufficient drawing effect to be exhibited and, besides, since the blank holder 3 is successively displaced in an orthogonal direction with respect to the press axis direction, the tension angle becomes shallow in the last stage of expansion so that the resistance to the material movement in the peripheral edge part 10b of the forming surface 10 of the punch 11 decreases, and thus internal strain of the sheet shaped workpiece P1 is effectively reduced by the facilitation of the material movement, making it possible to stably obtain a high quality press stamping product P having a higher dimensional accuracy and a high tensile stiffness.
  • a press forming device relating to a first preferred embodiment of the present invention is made up of, as shown in Figure 1 , a punch-side metal mold 1 as a stationary lower mold attached to a base (not shown), a die-side metal mold 2 as a movable upper mold which is fixedly arranged on the lower surface side of a ram (not shown) to be opposed to the punch-side metal mold 1, four independent blank holders 3... which sandwich and constrain each side of a peripheral part of a rectangular sheet shaped workpiece P1, and a rectangular frame-shaped holder support member 4.
  • each blank holder 3 is made up of a first sandwiching member 3 a which is held on the punch side via the holder support member 4, and a second sandwiching member 3b which is held on the die side.
  • the punch-side metal mold 1 is arranged, as shown in Figure 2 as well, such that the punch 11 of which top part constitutes as the whole a convex forming surface 10 is arranged to protrude upwardly, and a horizontal deck 12 extending outwardly from the entire circumference of the base part of the punch 11 is provided.
  • the forming surface 10 includes a local concave part 10a.
  • the horizontal deck 12 is formed with a plurality of pin insertion holes 15... at a fixed spacing in two rows, inner and outer, along each side surface 11a of the punch 11, includes an upward protruding part 12a... at each of four corners, and is formed with a flange part 12b which connects between these upward protruding parts 12a... at an outer end edge.
  • a mold abutment part 16 with a guide pin 16a is provided on the upper surface of each upward protruding part 12a of the horizontal deck 12
  • a holder sliding contact part 17 having a rectangular convex shape is included in each of the side surfaces opposing to each other of the upward protruding parts 12a...
  • further retainer safety pins 18 for the holder support member 4 are arranged to stand at four locations near each upward protruding part 12a in the vicinity of each flange part 12b along the longitudinal direction.
  • the die-side metal mold 2 is made up of, as shown in Figure 4 , a die 21 having a rectangular shape in a plan view and configured to protrude downwardly, and a sloped deck 22 which extends outwardly from the entire circumference of the base part to be sloped slightly upwardly, in which the downward-facing forming surface 20 of the die 21 takes on a concave shape as the whole corresponding to the forming surface 10 of the punch 11, and has a local convex part 20a corresponding to the local concave part 10a on the punch 11 side.
  • the die 21 includes holder opposite-contact parts 23, which each have a rectangular convex shape and to which a slide plate 5 is adhered, at a plurality of locations of each side surface 21a thereof.
  • the sloped deck 22 includes a plurality of slide plates 5 adhered thereto along each side of the die 21, and has downward protruding parts 22a..., which each have a rectangular shape in a plan view, at four corners, and downward-facing flanges 22b... which each connect between the downward protruding parts 22a... are formed at outer end edges.
  • a mold abutment part 24 with a pin hole 24a corresponding to the mold abutment part 16 on the punch 11 side is provided on the lower surface of each downward protruding part 22a of the sloped deck 22, and also strip-shaped holder holding parts 25 and 25, which each extend, at a position downwardly spaced apart from the sloped surface of the sloped deck 22, in parallel with the sloped surface in opposite directions, are provided in both side parts corresponding to each side of the die 21.
  • the holder support member 4 is configured, as shown in Figure 3 as well, such that a flat plate part 4b horizontally extends out inwardly from a lower part of the outer frame part 4a which is thick in vertical direction, and a plurality of cushion pins 41... are arranged to protrude on the lower surface side.
  • a plurality of slide plates 5 are adhered to the upper surface side of the flat plate part 4b, and a reciprocating air cylinder 6 in which a piston rod 6a is configured to protrude outwardly, is attached to a central position of each side.
  • each rectangular corner portion of the outer frame part 4a is inwardly recessed in a L-shape in a plan view, and strip-shaped holder holding parts 42 which each extend out above the flat plate part 4b from the upper surface part corresponding to each side of the L-shape are provided, as well as vertical sliding contact parts 43 which each have a rectangular convex shape and to which each slide plate 5 is adhered are formed on both side surfaces which are adjacent and facing outwardly.
  • the middle part of each side of the outer frame part 4a is recessed facing inwardly, and in the recessed portion, a vertically-oriented rectangular connecting plate 61 adhered to the tip end of the piston rod 6a of the air cylinder 6 protrudes upwardly.
  • This holder support member 4 is disposed to be able to move up and down via the cushion pins 41... in such a fashion to surround the punch 11 on the horizontal deck 12 of the punch-side metal mold 1 by inserting the cushion pins 41... into the pin insertion holes 15... of the horizontal deck 12 of the punch-side metal mold 1, and is arranged such that each vertical sliding contact part 43 in each corner part of the rectangular shape comes into slide contact with the holder sliding contact part 17 of the upward protruding part 12a in the horizontal deck 12.
  • the first sandwiching member 3a of each blank holder 3 which takes on a generally elongated bar shape, is formed with a concave groove 31a along the longitudinal direction in the upward facing sandwiching surface 30a on the inner edge side thereof; includes a plurality of engaging projections 32 and engaging pieces 33, which respectively protrude upwardly on the outside of the sandwiching surface 30a; is formed with a screwing part 34 for the air cylinder 6 of the holder support member 4, in the middle part in the longitudinal direction and facing outwardly; and is further formed with sloped sliding contact parts 35 which each form a sloped surface facing obliquely downward and vertical sliding contact parts 36 at a plurality of locations, respectively, in the inner side surface.
  • each engaging projection 32 includes a sloped guiding part 32a facing obliquely upwardly on the inner end side thereof, and a vertical abutment part 32b which continues to the lower end of the sloped guiding part 32a; and each engaging projection 32 located at each end in the longitudinal direction includes a positioning pin hole 301 in the top surface thereof. It is noted that a plurality of circular projections 302 as opposite-contact stoppers against the second sandwiching member 3b are provided on the upper surface of the first sandwiching member 3a.
  • Each first sandwiching member 3 a is supported to be movable in inward and outward directions on the flat plate part 4b of the holder support member 4 with both longitudinal end parts being held via the holder holding parts 42 and 42, and is configured to be displaced inwardly by the degenerating action of the air cylinder 6 by screwing the connecting plate 61 adhered to the tip end of a piston rod 6a of the air cylinder 6 to the screwing part 34 for connection.
  • the sloped sliding contact part 35 and the vertical sliding contact part 36 of the first sandwiching member 3a are opposed to the sloped sliding contact part 13 and the vertical sliding contact part 14 of the punch 11, respectively.
  • both the vertical sliding contact parts 36 and 14 abut each other as shown in the left half of Figure 1 , while at a raised position of the first sandwiching member 3a, the sloped sliding contact parts 35 and 13 are spaced apart. It is noted that the sloped sliding contact part 13 of the punch 11 and the sloped sliding contact part 35 of the first sandwiching member 3a are arranged to have the same slope angle.
  • the second sandwiching member 3b of each blank holder 3 has a longitudinal section of a substantially inverted L-shape and takes on an elongated bar shape having a length corresponding to the first sandwiching member 3b, in which the lower end of the suspended part on the inner edge side makes up a downward facing sandwiching surface 30b, and a bead 31b along the longitudinal direction is formed in the sandwiching surface 30b.
  • the second sandwiching part 3b includes an engaging convex part 37 which makes up a sloped guiding part 37b facing obliquely downwardly and a vertical abutment part 37b which continues to the upper end thereof at a plurality of locations in the longitudinal direction on the outer surface side of the suspended part, and is formed with a concave recessed part 38 in the vertical direction.
  • a die opposite-contact part 39 having a rectangular convex surface shape is formed at a plurality of locations in the longitudinal direction on the inner surface side of the suspended part.
  • the base part of the second sandwiching member 3b is configured to be gently sloped such that the upper surface becomes higher toward the outside, and have positioning pins 303 projected downwardly at both ends thereof.
  • Reference number 304 denotes a circular projection as an opposite contact stopper against the first sandwiching member 3a
  • 305 denotes a fall-preventing safety pin for the die-side metal mold 2.
  • Each second sandwiching member 3b is supported to be movable in inward and outward directions with both the longitudinal end parts being held on the lower surface side of the sloped deck 22 of the die-side metal mold 2 via the holder holding parts 25 and 25.
  • the upper surface side of the base part is in sliding contact with the lower surface of the sloped deck 22 via a slide plate 5, and at an inward moving limit, the die opposite-contact part 39 abuts the holder opposite-contact part 23 on the die 21 side.
  • each blank holder 3 is arranged such that when the first and second sandwiching members 3a and 3b are both at the inward moving limit, the sandwiching surfaces 30a and 30a of both the sandwiching members 3a and 3b are vertically opposed to each other, and the bead 31b of the second sandwiching member 3 can be fitted into the concave groove 31a of the first sandwiching member 3a, and in such fitted situation, the vertical abutment parts 32b and 37b of both the sandwiching members 3a and 3b abut each other, the positioning pin 303 of the second sandwiching member 3 is inserted into the positioning pin hole 301 of the first sandwiching member 3a, and further the engaging piece 33 of the first sandwiching member 3a is fitted into the concave recessed part 38 of the second sandwiching member 3.
  • the die 21 moves upwardly apart from the punch 11, and in a state in which the first sandwiching member 3 a and the second sandwiching member 3b of each blank holder 3 are vertically spaced apart, the sheet shaped workpiece P1 is disposed horizontally such that the peripheral part thereof is supported on the sandwiching surface 30a of each first sandwiching member 3a in the four blank holders 3.
  • each first sandwiching member 31 is located at a upper limit position in the inward moving limit, and in a state in which the vertical sliding contact part 35 is in contact with the vertical sliding contact part 13 of the punch 11, the sandwiching surface 30a is disposed at a position higher than the top end of the forming surface 10 of the punch 11.
  • the second sandwiching member 3b is raised as one body with the die 21 and is on standby in a state in which the sandwiching surface 30b thereof is disposed outside a position to face the sandwiching surface 30a of the first sandwiching member 3 a.
  • the die-side metal mold 2 is moved down as shown by an arrow a1 so that the second sandwiching member 3b of the blank holder 3 as well moves down as one body with the die 21.
  • the sloped guiding part 37a of the second sandwiching member 3b abuts the sloped guiding part 32a of the first sandwiching member 3a, and due to the slope guiding effect thereof, the second sandwiching member 3b is displaced inwardly as shown by an arrow a2.
  • the peripheral part of the sheet shaped workpiece P1 is gripped between the sandwiching surfaces 30a and 30b of both the sandwiching members 3a and 3b, and the bead 31b gets meshed with the concave groove 31a so that a groove shape G is formed in the peripheral part of the sheet shaped workpiece P1.
  • the constraining force is carried by a biasing resilience (cushion pad force) in the press axis direction of the cushion pin 41 supporting the first sandwiching member 3a via the holder support member 4.
  • the downward moving force causes the entire blank holder 3 to move down as one body with the die 21 as shown by an arrow a3 with the vertical sliding contact part 36 being in sliding contact with the vertical sliding contact part 14 of the punch 11, and the sheet shaped workpiece P1 constrained by the blank holder 3 comes into contact with the forming surface 10 of the punch 11, and next becomes fittingly superimposed on substantially the whole of the forming surface 10 while being elongated so that a three-dimensional shape of the forming surface 10 except the concave part 10a is faithfully transferred to the sheet shaped workpiece P1.
  • the sheet shaped workpiece P1 which is constrained by the blank holder 3 at the peripheral part is drawn out out outwardly to be expanded exhibiting desired drawing action, and as a result of the forming surface 20 of the die 21 which moves down coming into pressure contact with the sheet shaped workpiece P1 in a final step, the sheet shaped workpiece P1 is pressed between the punch 11 and the die 21 thereby being formed into a press stamping product P having a predetermined forming shape including a concave part.
  • the first sandwiching member 3 a of the blank holder 3 is displaced obliquely downwardly as shown by an arrow a5 in such a manner of sliding outwardly via the slide plate 5 on the horizontal part 4b of the holder support member 4 while pressing down the holder support member 4 against the biasing of the cushion pin 41.
  • the second sandwiching member 32 keeps on being displaced in the outward direction in one body with the first sandwiching member 31, since it is in sliding contact with the sloped deck 22 facing obliquely upwardly on the die 21 side via the slide plate 5, it will be displaced outwardly while relatively moving up as shown by an arrow a6 with respect to the die 21 which moves down.
  • the air cylinder 6 is arranged to be free for expansion and contraction in the pressing process, and the piston rod 6a extends along with the outward displacement of the second sandwiching member 32.
  • both the sandwiching members 3a and 3b of the blank holder 3 are detached upwardly and downwardly so that the press stamping product P lying on the first sandwiching member 3a can be taken out.
  • both the sandwiching members 3a and 3b of the blank holder 3 are disposed at an outward position apart from the press forming part.
  • both the sandwiching members 3 a and 3b of the blank holder 3 need to be returned to an initial position close to the press forming part to grip and constrain the peripheral part of the sheet shaped workpiece P1 at an appropriate position as a preparation for performing next press forming. Therefore, as shown in Figure 9(b) , by actuating the air cylinder 6 to contract, the first sandwiching member 3a is displaced by sliding inwardly on the holder support member 4, so as to be returned to the initial position at which the vertical sliding contact part 36 abuts the vertical sliding contact part 14 of the punch 11 side as shown in the left half of Figure 1 .
  • the second sandwiching member 3b even if positioned at an outward position, as described above, while the die-side metal mold 2 downwardly moves at the start of forming, as a result of the sliding contact of the sloped guiding part 37a with the sloped guiding part 32a of the first sandwiching member 3a, the second sandwiching member 3b is automatically displaced inwardly by the slope guiding effect, returning to the initial position at which the bead 31b is accurately opposed to the concave groove 31a of the first sandwiching member 3 a.
  • each blank holder 3 is displaced along the press axis direction to make the press stamping product P disengaged from the forming surface 10 of the punch 11 after the end of forming, and after both the sandwiching members 3a and 3b of the blank holder 3 are detached to take out the press stamping product P, and thereafter both the sandwiching members 3a and 3b which have been detached are displaced inwardly to be returned to the initial position before constraining of the sheet shaped workpiece P1; the press stamping product P maintains its formed shape at the time of expansion until it is separated from the forming surface 10 of the punch 11 and is freed from the constraint by the blank holder 3... so that the deformation of the press stamping product P is prevented.
  • the press stamping product P cannot maintain the formed shape at the time of expansion, and will be deformed.
  • the peripheral part of the sheet shaped workpiece P1 is gripped and thereby constrained between both sandwiching members 3 a and 3b of each blank holder 3, and each blank holder 3 is moved down as the die-side metal mold 2 moves down, so that first the sheet shaped workpiece P1 comes into contact with the forming surface 10 of the punch 11, and then is superimposed on the whole of the forming surface 10 so as to fit thereto while being elongated (see Figure 7 ).
  • each blank holder 3 In a process in which each blank holder 3 is displaced obliquely downwardly in an outward direction, the holder support member 4 moves down as well against the biasing of the cushion pins 41..., but each blank holder 3 will be relatively displaced in the horizontal direction with respect to the holder support member 4 since the holder support member 4 is only allowed to move up and down.
  • the present second embodiment as shown in Figure 10(a) , it is arranged such that in a step immediately before the die 21 comes into pressure contact with the sheet shaped workpiece P1, the holder support member 4 comes to abut the stopper 7 located on the horizontal deck 12 of the punch-side metal mold 1, thereby stopping the die 21 from moving down.
  • each blank holder 3 which being displaced obliquely downwardly in an outward direction is instantaneously displaced outwardly in the horizontal direction by inertial force, and immediately thereafter, the sheet shaped workpiece P1 is press formed between the die 21 and the punch 11 associated with the stopping of the holder support member 4 as shown in Figure 10(b) .
  • the blank holder 3 is displaced obliquely downwardly in an outward direction with respect to the press axis direction, thereby allowing sufficient drawing effect to be exhibited as in the case of the above described first embodiment, and besides, since the blank holder 3 is displaced outwardly and horizontally, the tension angle becomes shallow in the last stage of expansion so that the resistance to material movement in the peripheral edge part 10b of the forming surface 10 of the punch 11 decreases, and thus internal strain of the sheet shaped workpiece P1 is effectively reduced by the facilitation of the material movement, making it possible to stably obtain a high quality press stamping product P having a higher dimensional accuracy and a high tensile stiffness.
  • FIG. 11 shows displacement cycles of the blank holder 3 in the above described first and second embodiments, in which lines A1 and A2 on the lower side represent the motion of the first sandwiching member 3a, and lines B1 and B2 on the upper side represent relative motion of the second sandwiching member 3b with respect to the die 21, the lines A1 and B1 corresponding to the first embodiment, and the lines A2 and B2 corresponding to the second embodiment.
  • the first sandwiching member 3a moves down from an initial position S1 for standby before the constraint of the sheet shaped workpiece P1, the constrained sheet shaped workpiece P1 is displaced obliquely downwardly and outwardly from a position S2 in which the sheet shaped workpiece P1 is substantially superimposed on the forming surface of the punch 11, the die 21 moves up from a position S3 at which the die 21 comes into contact with the punch 11, and is displaced inwardly from a position S4, which is a rising limit, to return to the initial position S1, thus tracing a displacement cycle of four strokes.
  • the first sandwiching member 3a moves down from the initial position S 1; is displaced obliquely downwardly and outwardly from the position S2 in the same fashion, but it is displaced horizontally and outwardly from a position S5 immediately before the die 21 comes into contact with the punch 11; moves up from a position S6 where the die 21 and the punch 11 come into contact; is displaced inwardly from the rising limit position S7, thereafter returning to the initial position S1; thus tracing a displacement cycle of 5 strokes.
  • the relative displacement of the second sandwiching member 3b with respect to the die 21 will trace a linear reciprocal displacement cycle along each direction of slope between an initial position T1 for standby before the constraint of the sheet shaped workpiece P1 and an outward position T2 corresponding to the position S4 of the first sandwiching member 3 a side in the first embodiment, and between the initial position T1 and an outward position T3 corresponding to the position S7 on the first sandwiching member 3 a side in the second embodiment.
  • the interval from the position S2 to the position S3 represents the expansion direction and expansion amount of the sheet shaped workpiece P1 in the process in which the first sandwiching member 3 a is displaced obliquely downwardly and outwardly in the first embodiment.
  • the first sandwiching member 3a is displaced obliquely downwardly and outwardly from the position S2 as with the first embodiment, since the direction of displacement is converted to a horizontal direction from the position S5 which is before the position S3, the expansion direction of the sheet shaped workpiece P1 is changed to a gentler slope having an angle which is reduced by an angle of ⁇ as shown by the line C, and the expansion amount becomes larger than in the first embodiment.
  • the height difference h1 between the positions S3 and S6 equals to the height difference h2 between the positions T2 and T3.
  • an angle ⁇ 1 with respect to the press axis direction Y shown in the Figure be in a range of 20 to 70°. That is, letting the expansion direction of the sheet shaped workpiece P1 be the direction of slope within the above described angle range makes it possible to reduce the resistance to material movement near the peripheral edge part 10b of the forming surface 10 of the punch 11, thereby enhancing the degree of expansion, and allowing sufficient drawing effect to be exhibited so that it is possible to impart a good tensile stiffness to the product part A of the press stamping product P.
  • the angle ⁇ 2 with respect to the direction normal to the press direction Y shown in the figure is preferably in a range of 1 to 10° with reference to the die 21.
  • the angle ⁇ 2 is too small, it becomes difficult to securely prevent the motion of the second sandwiching member 3b to move toward the die 21 side during forming.
  • the angle ⁇ 2 is too large, the outward component force of the press actuating force applied to the second sandwiching member 3b from the die 21 becomes excessively large, and the sandwiching force of the sheet shaped workpiece P1 by the blank holder 3 becomes insufficient.
  • a power mechanism for inward displacement such as an air cylinder may be provided in each of both the sandwiching members.
  • a fluid pressure cylinder including oil pressure, and a cam mechanism and crank mechanism driven by a motor, and the like may be adopted.
  • both the detached sandwiching members 3a and 3b of each blank holder 3 after the end of forming are supposed to be returned to the initial position after the press stamping product P is taken out in the above described press forming example, they can also be returned to the initial position before the press stamping product is taken out in the present invention. That is, although, in a state in which both the sandwiching members 3a and 3b of the blank holder 3 are detached, the press stamping product P is placed on one of them in such a manner as being supported at the peripheral part thereof, since the peripheral part is under a non-constraint condition, even if the supporting sandwiching member returns to the initial position, only the peripheral part is deviated on the sandwiching member without resulting in deformation of the press stamping product P itself.
  • the press stamping product P when both the sandwiching members 3a and 3b of each blank holder 3 are detached upwardly and downwardly after the end of forming, the press stamping product P will be placed on the first sandwiching member 3a, and even if the first sandwiching member 3a is inwardly displaced by an air cylinder 6 as is, only the groove shape G of the peripheral part of the press stamping product P will be deviated from the concave groove 31a of the first sandwiching member 3 a so that the press stamping product P may be taken out before the second sandwiching member 3b is returned to the initial position by the actuation of the die 2 side.
  • the press forming method and press forming device of the present invention besides the configuration in which the punch 11 is a stationary lower mold and the die 21 is a movable upper mold as in the embodiments, it is possible to adopt other configurations such as one in which the top and bottom relationship between the punch 11 and the die 21 is reversed from that in the embodiments, one in which the punch 11 moves as a movable type, and one in which the press axis direction is oblique or sideways.
  • outward displacement means for displacing the blank holder 3 outwardly departing from the press forming part it is possible to adopt, without being limited to the slope guiding scheme by the sliding contact between the sloped sliding contact parts 13 and 35 on the punch 11 side and the blank holder 3 side exemplified by the embodiments, a slope guiding system based on rolling contact between a sloped guiding part on one side and a roller on other side, a slope guiding system via a wedge-shaped slider, a displacement mechanism utilizing a cam, a crank, a guide rail, a universal joint, etc., various displacement mechanisms for converting the motion in the press direction of a movable press mold into a direction departing from the punch 11, and systems for singly displacing the blank holder 3 such as by a hydraulic cylinder, etc.
  • each blank holder 3 which constrains a sheet shaped workpiece P1 is displaced along a press axis direction Y to make the sheet shaped workpiece P1 superimposed on the forming surface 10 of the punch 11, and then the blank holder 3 is displaced outwardly to make the sheet shaped workpiece P1 expanded, in which the timing for switching the displacement direction does not require much exactness. That is, the above described switching of the displacement direction may be performed in a state in which the convex shape of the punch 11 has been generally transferred to the sheet shaped workpiece P1, and the expansion may be started before the sheet shaped workpiece P1 covers the forming surface 10 of the punch 1 to the peripheral edge thereof.
  • the displacement in an obliquely outward direction may be changed to multiple strokes with different oblique angles, or the displacement may be curvilinear.
  • the configuration may be such that the sloped sliding contact part between the punch 1 side and the blank holder 3 (first sandwiching member 3a) side is made up of multiple stages and the slope angle with respect to the press axis direction becomes larger in the later stages.
  • the sliding contact part may be made up of a curved surface.
  • the blank holder 3 although four of them corresponding to each side of the press forming part having a rectangular shape in a plan view are used in the embodiments, an appropriate number, not less than 2, of holders may be adopted, for example, 3 holders when the press forming part has a generally triangular shape or circular shape in a plan view, a number corresponding to each side in the case of a polygon not less than 5 angles (pentagon), 2 holders facing each other in the width direction when an elongated sheet shaped workpiece P1 is expanded only in the width direction, depending on the shapes of press forming part and required expansion directions.
  • the holder support member 4 instead of a ring-shaped unit body surrounding the outside of the punch 11 as in the embodiments, a plurality of mutually independent members corresponding to each of one or more blank holders 3 may be used.
  • the sheet shaped workpiece P1 addressed in the present invention is not limited to the exemplified thin metal sheet, but includes various materials, such as sheet materials of thermoplastic resins such as polypropylene, polyvinyl chloride, polyethylene terephthalate, polyacryl, etc., fiber reinforced resin sheets such as FRP and laminated sheet materials thereof, and resin laminated metal sheets.
  • thermoplastic resins such as polypropylene, polyvinyl chloride, polyethylene terephthalate, polyacryl, etc.
  • fiber reinforced resin sheets such as FRP and laminated sheet materials thereof, and resin laminated metal sheets.
EP12830768.3A 2011-09-09 2012-08-21 Press forming method and press forming device Not-in-force EP2754509B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2011197459A JP5319748B2 (ja) 2011-09-09 2011-09-09 プレス成形方法及びプレス成形装置
PCT/JP2012/071048 WO2013035520A1 (ja) 2011-09-09 2012-08-21 プレス成形方法及びプレス成形装置

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EP2754509A1 EP2754509A1 (en) 2014-07-16
EP2754509A4 EP2754509A4 (en) 2015-04-29
EP2754509B1 true EP2754509B1 (en) 2017-11-22

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JP (1) JP5319748B2 (zh)
KR (1) KR101915829B1 (zh)
CN (1) CN104023868B (zh)
WO (1) WO2013035520A1 (zh)

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FR3008330B1 (fr) * 2013-07-15 2016-01-01 Peugeot Citroen Automobiles Sa Outillage de presse adapte pour emboutir des pieces de grande dimension
JP6257078B2 (ja) * 2014-01-30 2018-01-10 ダイハツ工業株式会社 プレス成形金型
FR3019072B1 (fr) * 2014-03-26 2016-11-18 Peugeot Citroen Automobiles Sa Presse d'emboutissage comprenant une matrice et une serie de serre-flans disposes sous la peripherie de la matrice
MX2018003160A (es) * 2015-09-18 2018-07-06 Nippon Steel & Sumitomo Metal Corp Producto formado tipo panel y su metodo de fabricacion.
EP3187276A1 (de) * 2015-12-30 2017-07-05 voestalpine Automotive Components Deutschland GmbH Umformwerkzeug
BR112018014338A2 (pt) 2016-01-26 2018-12-11 Nippon Steel & Sumitomo Metal Corporation máquina de prensagem e método para a fabricação de um produto conformado em prensa
FR3057791B1 (fr) * 2016-10-26 2018-11-23 Peugeot Citroen Automobiles Sa Presse destinee a mettre en forme un flan de tole et procede de maintenance d’une telle presse
CN107999661B (zh) * 2017-12-15 2019-09-13 株洲春华实业有限责任公司 用于椭圆封头预压变形的压边装置
CN108057780A (zh) * 2017-12-18 2018-05-22 重庆安亚模具制造有限公司 一种变压力拉延模具
JP2020131213A (ja) * 2019-02-14 2020-08-31 新明工業株式会社 金型装置
CN110064695A (zh) * 2019-05-08 2019-07-30 瑞鹄汽车模具股份有限公司 提高外覆盖件刚性的组合拉延冲压模具及其成型工艺
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Publication number Publication date
KR101915829B1 (ko) 2018-11-06
EP2754509A4 (en) 2015-04-29
CN104023868B (zh) 2016-05-25
CN104023868A (zh) 2014-09-03
JP2013056367A (ja) 2013-03-28
EP2754509A1 (en) 2014-07-16
JP5319748B2 (ja) 2013-10-16
KR20140059223A (ko) 2014-05-15
WO2013035520A1 (ja) 2013-03-14

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