WO2018168311A1 - Dispositif d'étirage - Google Patents

Dispositif d'étirage Download PDF

Info

Publication number
WO2018168311A1
WO2018168311A1 PCT/JP2018/005291 JP2018005291W WO2018168311A1 WO 2018168311 A1 WO2018168311 A1 WO 2018168311A1 JP 2018005291 W JP2018005291 W JP 2018005291W WO 2018168311 A1 WO2018168311 A1 WO 2018168311A1
Authority
WO
WIPO (PCT)
Prior art keywords
mold
blank holder
workpiece
die
side pad
Prior art date
Application number
PCT/JP2018/005291
Other languages
English (en)
Japanese (ja)
Inventor
浩一 佐々木
哲也 門脇
Original Assignee
株式会社ヒロテック
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 株式会社ヒロテック filed Critical 株式会社ヒロテック
Priority to JP2019505791A priority Critical patent/JP6767063B2/ja
Publication of WO2018168311A1 publication Critical patent/WO2018168311A1/fr

Links

Images

Classifications

    • 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
    • B21D24/00—Special deep-drawing arrangements in, or in connection with, presses
    • B21D24/10—Devices controlling or operating blank holders independently, or in conjunction with dies

Definitions

  • the present invention relates to a drawing apparatus for drawing a panel-like part.
  • an automobile door is configured by joining an inner panel 1 shown in FIGS. 1 to 3 and an outer panel (not shown).
  • 1 shows the case where the inner panel 1 is viewed from the side of the vehicle
  • FIG. 2 is a perspective view of the inner panel 1
  • FIG. 3 shows the case where the inner panel 1 is viewed from the direction of arrow A in FIG. ing.
  • the inner panel 1 includes a panel body 10, a joint portion 11 that is provided on a peripheral portion of the panel body 10 and is joined to the outer panel by hemming, and a sash portion 12 that supports the window glass. As shown in FIG.
  • the panel body 10 has a shape in which a central portion in the vertical direction protrudes outward from the vehicle upper and lower ends, and an upper surface portion 10 a, a lower surface portion 10 b, and an end surface portion in the vehicle front-rear direction.
  • 10c has a shape extending toward the outside of the vehicle interior.
  • the upper surface part 10a and the lower surface part 10b of the panel main body 10 in the vehicle interior / exterior direction is shorter than the dimension of the end surface part 10c in the vehicle interior / exterior direction
  • the upper surface part 10a and the lower surface part of the panel main body 10 The aperture at the portion where 10b is molded is shallow, and the aperture is deeper at the portion where the end surface portion 10c of the panel body 10 is molded.
  • the molded surface on the vehicle interior side of the inner panel 1 has a product shape curved outwardly from the vehicle interior, and therefore, the die face D1 is usually set along the shape.
  • the entire circumference is drawn with a uniform drawing depth, so that there is extra material by the drawing height H in the vicinity of the sash portion 12 where the required drawing height is shallow.
  • the outer dimensions (size) of the material used increase, resulting in a problem that the yield deteriorates and the manufacturing cost increases.
  • the die face D2 is set so that the aperture height H in the vicinity of the sash portion 12 is low.
  • the die face D2 is more curved than the die face D1
  • the curved surface The degree of deformation of the material as a whole in the direction of contraction increases when it is molded toward the inside. For this reason, it is difficult to design a mold so that the material is uniformly stretched, and wrinkles are likely to occur locally in the material.
  • Patent Document 1 a blank holder for a shallow portion of a plate-like workpiece and a blank holder for a deep portion are provided, and a single workpiece is formed with different strokes. It is conceivable to perform drawing. In this case, a sill-shaped surplus portion is formed in the boundary portion of the punch so that cracks and wrinkles do not occur at the boundary portion where the drawing depth changes. Disperses and relieves unfavorable stress on the workpiece due to differences in operation.
  • Patent Document 1 by operating separately the blank holder for the shallow part of the plate-like workpiece and the blank holder for the deep part, the drawing depth of the single workpiece can be reduced. Although it is possible to mold shallow and deep parts, there is a concern that undesired stress may occur on the workpiece due to the difference in operation of the blank holder, so a sill-like surplus part is formed in the punch There is a need.
  • the present invention has been made in view of such points, and an object of the present invention is to provide a drawing forming apparatus for drawing panel-like parts having different drawing depths, while avoiding complication of the mold shape. It is to suppress the occurrence of cracks and wrinkles and to further improve the yield.
  • a plate-shaped workpiece is formed by drawing so that a first side surface having a relatively large drawing depth and a second side surface having a small drawing depth are circumferentially disposed around the outer peripheral portion.
  • a mold for forming a panel-like component formed continuously in a direction and having a boundary portion between the first side surface and the second side surface formed of a curved surface having a predetermined shape It has a first mold and a second mold arranged so as to sandwich a plate-like workpiece in the thickness direction, and is driven in a direction in which one of the first mold and the second mold is in contact with or separated from the other
  • a first molding surface for molding the first side surface and a second molding surface for molding the second side surface are continuous in the circumferential direction of the first mold.
  • the boundary portion between the first molding surface and the second molding surface is a curved molding surface that molds the curved surface
  • a blank holder that holds the workpiece in the thickness direction together with the second mold is disposed at a portion corresponding to the first molding surface on the outer periphery of the first mold, and the second mold on the outer periphery of the first mold.
  • a pad for clamping the workpiece in the thickness direction together with the second mold is arranged, and in the drawing apparatus configured to cause the blank holder and the pad to perform different operations,
  • the blank holder is formed so as to go from the first molding surface side to the second molding surface side on the outer periphery of the first mold, and the inner edge portion of the blank holder on the contact surface with the workpiece is The shape is along the curved surface.
  • the plate-like workpiece is pressed in the thickness direction by the first die and the second die, so that the first side surface having a deeper drawing depth and a shallow drawing depth are relatively formed on the outer peripheral portion.
  • a panel-like component in which the second side surface is continuously formed in the circumferential direction and the boundary portion between the first side surface and the second side surface is configured by a curved surface having a predetermined shape can be molded.
  • a plate-shaped workpiece is sandwiched between the blank holder and the second mold disposed on the outer periphery of the first mold, and the pad disposed on the outer periphery of the first mold.
  • a plate-shaped workpiece is sandwiched between the second mold.
  • the blank holder is arranged to correspond to the first side surface having a relatively deep drawing depth
  • the pad is arranged to correspond to the second side surface having a relatively small drawing depth. Since the blank holder and the pad perform different operations as in the conventional example, the first side surface with the deep drawing depth and the second side surface with the shallow drawing depth can be formed on a single plate-like workpiece.
  • the contact surface of the blank holder Since the contact surface of the blank holder is in contact with the workpiece and becomes a portion that sandwiches the workpiece, a force is applied so that the contact surface of the blank holder pulls the workpiece during drawing.
  • the inner edge of the contact surface of the blank holder with the workpiece is shaped along the curved molding surface of the first mold, so that the workpiece can be placed along the curved molding surface of the first mold during drawing. Can be pulled. Thereby, cracks and wrinkles can be prevented from occurring at the boundary portion where the drawing depth changes without forming a sill-like surplus portion as in the conventional example in the mold.
  • the complexity of the mold shape is avoided, and the surplus part of the work is reduced, resulting in less waste of material.
  • the second invention is characterized in that beads are formed on the blank holder and the pad so as to press-contact the work and suppress a flow during drawing of the work.
  • the third invention is characterized in that an inner edge portion of a contact surface of the blank holder with the workpiece is substantially similar to the curved surface.
  • the present invention when panel-shaped parts having different drawing depths are drawn, the occurrence of cracking and wrinkling of the workpiece is suppressed while avoiding complication of the mold shape, and the yield is further improved. Can do.
  • FIG. 5 is a cross-sectional view of the drawing apparatus corresponding to the VI-VI line in FIG. 4, showing a state where the upper mold is near the top dead center.
  • FIG. 7 is a view corresponding to FIG. 6 illustrating a state in which the upper die is lowered and the upper die and the blank holder start to sandwich the workpiece.
  • FIG. 7 is a view corresponding to FIG.
  • FIG. 6 shows a state in which the upper mold is near the bottom dead center.
  • FIG. 5 is a cross-sectional view of the drawing apparatus corresponding to the line IX-IX in FIG. 4, showing a state where the upper mold is near the top dead center.
  • FIG. 10 is a view corresponding to FIG. 9 illustrating a state in which the upper die is lowered and the upper die and the blank holder start to sandwich the workpiece.
  • FIG. 10 is a view corresponding to FIG. 9 showing a state in which the upper mold is near the bottom dead center. It is a simulation result image in the bottom dead center vicinity at the time of shape
  • molding an inner panel with the drawing apparatus which concerns on embodiment of this invention. 13 is a simulation result image at the same timing as in FIG.
  • FIG. 13 is a simulation result image at the same timing as FIG. 12 in the case where the inner panel is formed by a drawing apparatus having a shape in which the lower side pad extends linearly to the front blank holder side according to Comparative Example 2.
  • FIG. 13 is a simulation result image at the same timing as FIG. 12 in the case where the inner panel is formed by a drawing apparatus having a shape in which the lower side pad extends linearly to the front blank holder side according to Comparative Example 2.
  • FIGS. 1 to 3 show an inner panel 1 of an automobile door, and the inner panel 1 is a panel-like component molded by a drawing apparatus 20 (described later) according to an embodiment of the present invention.
  • the inner panel 1 can be made of various metals such as steel, and is obtained by drawing a metal plate material such as an aluminum alloy (a plate-like workpiece W in FIG. 6). It joins with the outer panel which is not illustrated, and becomes the door for motor vehicles (not shown).
  • the workpiece W is also referred to as “material”.
  • the inner panel 1 includes a panel body 10, a joint portion 11 that is provided on a peripheral portion of the panel body 10 and is joined to the outer panel by hemming, and a sash portion 12 that supports the window glass.
  • the panel main body 10 has a shape such that the center portion in the vertical direction projects outward from the vehicle upper and lower end portions.
  • An upper surface portion 10a extending outward from the passenger compartment is provided at the upper edge portion of the sash portion 12.
  • a lower surface portion 10 b extending outward from the passenger compartment is provided at the lower edge of the panel body 10.
  • both end portions of the panel main body 10 in the vehicle front-rear direction are provided with end surface portions 10 c extending outward from the passenger compartment.
  • the upper surface portion 10a, the end surface portion 10c, and the lower surface portion 10b are continuous in the circumferential direction of the inner panel 1.
  • the upper surface portion 10a, the end surface portion 10c, and the lower surface portion 10b are portions obtained by drawing.
  • the dimension L1 from the edge in the vehicle front-rear direction at the center of the panel body 10 to the tip of the end face 10c is a dimension L2 from the lower edge of the panel body 10 to the tip of the bottom face 10b.
  • the end surface portion 10c is a side surface (first side surface) having a relatively deep drawing depth
  • the lower surface portion 10b is a side surface (second side surface) having a relatively small drawing depth.
  • the boundary portion between the front end surface portion 10c and the lower surface portion 10b, that is, the corner portion is constituted by a curved surface 10e having a predetermined shape, and the rear end surface portion 10c and the lower surface portion 10b
  • the boundary portion, that is, the corner portion is also constituted by a curved surface 10e having a predetermined shape.
  • the shapes of the front curved surface 10e and the rear curved surface 10e may be different from each other. That is, on the outer peripheral portion of the inner panel 1, an end surface portion 10c having a relatively deep drawing depth and a lower surface portion 10b having a shallow drawing depth are continuously formed in the circumferential direction, and the end surface portion 10c and the lower surface portion are also formed.
  • the boundary part with 10b is comprised by the curved surface 10e of predetermined shape.
  • the drawing apparatus 20 contacts and separates the lower mold 30 and the upper mold 40 for forming the inner panel 1 and one of the lower mold 30 and the upper mold 40 with respect to the other.
  • a mold driving device 50 for driving in the direction.
  • the upper mold 40 is disposed above the lower mold 30.
  • the lower die 30 is fixed, and the upper die 40 is driven in the vertical direction by the die driving device 50 to come in contact with and separate from the lower die 30.
  • the vicinity of the top dead center of the upper mold 40 is shown in FIGS. 6 and 9, respectively, and the vicinity of the bottom dead center of the upper mold 40 is shown in FIGS. 8 and 11, respectively.
  • the mold driving device 50 can be composed of a power generation device such as a fluid pressure cylinder, and is controlled by a control device (not shown).
  • FIG. 4 is a plan view of the lower mold 30.
  • the lower mold 30 will be described with reference to each direction of the inner panel 1. That is, the “front side” of the lower mold 30 is the side on which the vehicle front side of the inner panel 1 is disposed, and the “rear side” of the lower mold 30 is the side on which the vehicle rear side of the inner panel 1 is disposed. .
  • the “upper side” of the lower mold 30 is the side on which the vehicle upper side (roof side) of the inner panel 1 is disposed, and the “lower side” of the lower mold 30 is the vehicle lower side of the inner panel 1 ( (The floor side) is the side where it is placed.
  • the lower mold 30 includes a punch (first mold) 31, a front blank holder 32 provided on the front side of the punch 31, and a rear provided on the rear side of the punch 31.
  • a lower mold lower side gas spring 38 and a lower mold upper side gas spring 39 shown in FIG. 9).
  • the punch 31 is a member for transferring the product shape to the workpiece W from below, and is assembled to a lower mold holder (not shown) and fixed to a bolster (not shown) via the lower mold holder. ing.
  • the upper surface of the punch 31 is a molding surface 31a.
  • an upper side guide member 30a is provided on the upper side of the punch 31 to guide the lower mold upper side pad 35 so as to be movable only in the vertical direction while restricting movement in the horizontal direction.
  • a lower side guide member 30b is provided for guiding the lower die lower side pad 34 so as to be movable only in the vertical direction while restricting movement in the horizontal direction.
  • the upper surface of the punch 31 is formed so as to bulge upward so that the workpiece W can be drawn. That is, as shown in FIG. 5, the punch 31 has a first molding surface 31 b for molding the front end surface portion 10 c of the panel body 10 and a second molding for molding the lower surface portion 10 b of the panel body 10. The surface 31 c is provided so as to be continuous in the circumferential direction at the peripheral edge of the punch 31. Further, a boundary portion between the first molding surface 31 b and the second molding surface 31 c in the peripheral portion of the punch 31 is a curved surface 31 d for molding the curved surface 10 e of the panel body 10. Further, as shown in FIG. 4, the punch 31 also has a molding surface 31e for molding the rear end surface portion 10c of the panel body 10 and a molding surface 31f for molding the upper surface portion 10a of the panel body 10. It is provided at the peripheral edge of the punch 31.
  • the front blank holder 32 is disposed at a portion corresponding to the first molding surface 31 b on the outer periphery of the punch 31, and is a member for holding the workpiece together with the upper mold 40 in the thickness direction.
  • the lower die lower side pad 34 is disposed at a portion corresponding to the second molding surface 31 c on the outer periphery of the punch 31, and is a member for holding the workpiece together with the upper die lower side pad 44 in the thickness direction.
  • the rear blank holder 33 is disposed at a portion corresponding to the molding surface 31 e of the punch 31 and is a member for holding the workpiece together with the upper mold 40 in the thickness direction.
  • the lower mold upper side pad 35 is disposed at a portion corresponding to the molding surface 31 f on the outer periphery of the punch 31, and is a member for holding the workpiece W in the thickness direction together with the upper mold upper side pad 45.
  • Fig. 4 shows the lower mold including the blank holder, but the surrounding mold structure is omitted for easy understanding.
  • the rear blank holder 33 and Predetermined clearances are provided between the molding surface 31 e of the punch 31 and between the lower mold upper side pad 35 and the molding surface 31 f of the punch 31.
  • the rear side A predetermined clearance is also provided between the blank holder 33 and the lower mold upper side pad 35.
  • Mold internal structures such as front blank holder 32, rear blank holder 33, lower mold lower side pad 34, lower mold upper side pad 35 and guide so as to move relative to each other in the vertical direction while maintaining the clearance of these parts. (Not shown because of a well-known structure) is arranged and configured.
  • the front blank holder 32 and the rear blank holder 33 are integrally formed in a peripheral portion not shown in FIG. 4 and are configured to perform the same operation.
  • the front blank holder 32 is formed so as to go from the first molding surface 31 b side to the second molding surface 31 c side on the outer periphery of the punch 31.
  • the upper surface of the front blank holder 32 is a contact surface 32a to the workpiece W.
  • a bead 32b is formed that presses against the workpiece W and suppresses the flow of the workpiece W during drawing.
  • the bead 32b is formed of a concave bead and continuously extends from the upper side to the lower side of the front blank holder 32.
  • the inner edge of the workpiece W on the contact surface 32a of the front blank holder 32 is defined as an inner edge 32c.
  • a portion of the inner edge portion 32c corresponding to the curved surface forming surface 31d has a shape along the curved surface forming surface 31d.
  • the inner edge portion 32c of the contact surface 32a is substantially similar to the curved surface 31d.
  • the upper surface of the lower mold side pad 34 is a contact surface 34a to the workpiece W.
  • a bead 34b is formed which presses against the workpiece W and suppresses the flow of the workpiece W during drawing.
  • the bead 34b is formed of a concave bead and continuously extends from the front side to the rear side of the lower mold lower side pad 34.
  • the upper surface of the rear blank holder 33 is a contact surface 33a to the workpiece W.
  • a bead 33b is formed which presses against the workpiece W and suppresses the flow during drawing of the workpiece W.
  • the bead 33b is formed of a concave bead and continuously extends from the upper side to the lower side of the rear blank holder 33.
  • the upper surface of the lower mold upper side pad 35 is a contact surface 35a to the workpiece W.
  • a bead 35b is formed on the contact surface 35a of the lower mold upper side pad 35 so as to press the work W and suppress the flow of the work W during drawing.
  • the bead 35b is formed of a concave bead, and continuously extends from the front side to the rear side of the lower mold upper side pad 35.
  • the front blank holder 32 is supported from below by a front cushion pin 36.
  • the front cushion pin 36 is a member for holding the front blank holder 32 on which the workpiece W is placed at the raised end position shown in FIG. 6 and applying an urging force constantly upward, and has been conventionally known.
  • the front cushion pin 36 moves downward as shown in FIG. 8, and the front blank holder 32 is in the lowered end position.
  • the rear blank holder 33 is supported from below by the rear cushion pins 37 in the same manner as the front blank holder 32.
  • the rear cushion pin 37 is configured in the same manner as the front cushion pin 36.
  • the lower die lower side pad 34 is supported from below by a lower die lower side gas spring 38.
  • the lower mold lower side gas spring 38 is a member for holding the lower mold lower side pad 34 on which the work W is placed at the raised end position shown in FIG. It is.
  • the lower mold lower side gas spring 38 is contracted as shown in FIG. 11, and the lower mold lower side pad 34 is moved to the lowered end position.
  • the lower mold upper side pad 35 is supported from below by the lower mold upper side gas spring 39 in the same manner as the lower mold lower side pad 34.
  • the lower mold upper side gas spring 39 is configured in the same manner as the lower mold lower side gas spring 38.
  • the lower mold lower side pad 34 and the lower mold upper side pad 35 are configured as separate members from the front blank holder 32 and the rear blank holder 33 that are integrally configured as described above, and are different from each other. Since it is supported by the support device, it can be operated separately. That is, the drawing apparatus 20 according to this embodiment performs different operations without interlocking the front blank holder 32 and the rear blank holder 33 with the lower mold lower side pad 34 and the lower mold upper side pad 35. It is configured. This is because the front blank holder 32 and the rear blank holder 33 are arranged so as to correspond to the deep drawing portion, while the lower die lower side pad 34 and the lower upper die pad 35 are shallow drawing portions. Because it is arranged to correspond to. Details of the operation will be described later.
  • the upper mold 40 includes a die (second mold) 41, an upper mold lower side pad 44 provided on the lower side of the die 41, and an upper mold upper side provided on the upper side of the die 41.
  • a pad 45, an upper mold lower side gas spring 48, and an upper mold upper side gas spring 49 are provided.
  • the die 41 is a member for transferring the product shape to the workpiece W from above, and is disposed so as to face the punch 31 and is assembled to an upper mold holder (not shown). Fixed to a slide (not shown). Thereby, the die 41 and the punch 31 are disposed so as to sandwich the workpiece W in the thickness direction. The die 41 is driven in a direction in which the die 41 comes in contact with and separates from the punch 31.
  • the lower surface of the die 41 is a molding surface 41a.
  • an upper side guide member 41b for guiding the upper mold upper side pad 45 so as to be movable only in the vertical direction while restricting movement in the horizontal direction.
  • a lower side guide member 41c for guiding the upper mold lower side pad 44 in the vertical direction is provided on the lower side of the die 41.
  • the upper mold work gripping portion 56 located on the front side of the molding surface 41 a of the die 41 is formed so as to face the contact surface 32 a of the front blank holder 32, and is a contact surface to the work W. It is said that. As a result, as shown in FIG. 7, the workpiece W can be clamped in the thickness direction by the upper workpiece gripping portion 56 of the die 41 and the contact surface 32 a of the front blank holder 32.
  • a convex bead 41d is formed on the upper work gripping portion 56 of the die 41 so as to press the work W and suppress the flow during drawing of the work W.
  • the bead 41d of the die 41 and the bead 32b of the front blank holder 32 are arranged so as to face each other in the vertical direction. As shown in FIG.
  • the bead 32b of the front blank holder 32 is pressed against the same portion of the workpiece W to deform the workpiece W. Thereby, the flow at the time of drawing forming the workpiece W is suppressed.
  • the upper work gripping portion 57 located on the rear side of the molding surface 41 a of the die 41 is formed so as to face the contact surface 33 a of the rear blank holder 33. It is supposed to be the contact surface.
  • the workpiece W can be clamped in the thickness direction between the upper work gripping portion 57 of the die 41 and the contact surface 33 a of the rear blank holder 33.
  • a convex bead 41e is formed on the upper work gripping portion 57 of the die 41 so as to press the work W and suppress the flow during drawing of the work W.
  • the bead 41e of the die 41 and the bead 33b of the rear blank holder 33 are arranged so as to face each other in the vertical direction, and as shown in FIG.
  • the bead 33b of the rear blank holder 33 is pressed against the same portion of the workpiece W to deform the workpiece W. Thereby, the flow at the time of drawing forming the workpiece W is suppressed.
  • the upper die upper side pad 45 is arranged to face the lower die upper side pad 35.
  • the lower surface of the upper mold upper side pad 45 is a contact surface 45 a to the workpiece W.
  • the workpiece W can be sandwiched between the contact surface 45 a of the upper mold upper side pad 45 and the contact surface 35 a of the lower mold upper side pad 35 in the thickness direction.
  • a convex bead 45b is formed which presses against the work W and suppresses the flow during drawing of the work W.
  • the beads 45b of the upper die upper side pad 45 and the beads 35b of the lower die upper side pad 35 are arranged so as to face each other in the vertical direction. As shown in FIG.
  • the bead 45b of the mold upper side pad 45 and the bead 35b of the lower mold upper side pad 35 are pressed against the same part of the work W to deform the work W. Thereby, the flow at the time of drawing forming the workpiece W is suppressed.
  • the upper die lower side pad 44 is disposed so as to face the lower die lower side pad 34.
  • the lower surface of the upper mold lower side pad 44 is a contact surface 44 a to the workpiece W.
  • the workpiece W can be held in the thickness direction between the contact surface 44 a of the upper mold lower side pad 44 and the contact surface 34 a of the lower mold lower side pad 34.
  • a convex bead 44b that presses against the work W and suppresses the flow of the work W during drawing is formed.
  • the beads 44b of the upper mold lower side pad 44 and the beads 34b of the lower mold lower side pad 34 are arranged so as to face each other in the vertical direction. As shown in FIG.
  • the bead 44b of the lower mold side pad 44 and the bead 34b of the lower lower pad 34 are pressed against the same part of the work W to deform the work W. Thereby, the flow at the time of drawing forming the workpiece W is suppressed.
  • the route by which the beads are arranged on the blank holder / pad is not limited to a linear route, and can be adjusted in consideration of the inflow amount.
  • this adjustment work is performed by a method well known to those skilled in the art, such as a molding simulation or an on-site adjustment work.
  • the upper mold lower side pad 44 is supported from above by an upper mold lower side gas spring 48.
  • the upper mold lower side gas spring 48 holds the upper mold lower side pad 44 in the lower position shown in FIG. 9, and when an upward force is applied to the upper mold lower side pad 44 from the lower mold 30 as shown in FIG. Thus, the upper mold lower side gas spring 48 is contracted to bring the upper mold lower side pad 44 into the upper position.
  • the upper mold upper side pad 45 is supported from above by an upper mold upper side gas spring 49 in the same manner as the upper mold lower side pad 44.
  • the upper mold upper side gas spring 49 is configured in the same manner as the upper mold lower side gas spring 48.
  • a predetermined clamping force is applied to the workpiece W in the thickness direction by the lower mold lower side gas spring 38 and the upper mold lower side gas spring 48, and by the lower mold upper side gas spring 39 and the upper mold upper side gas spring 49. It can be generated.
  • the urging force of the upper mold lower side gas spring 48 is stronger than the urging force of the lower mold lower side gas spring 38, and the urging force of the upper mold upper side gas spring 49 is applied to the lower mold upper side gas spring 39. It is set stronger than the power.
  • the blank holders 32 and 33 and the lower mold lower side pad 34 at the time of drawing are determined by the strength relationship of the gas springs, the stroke amounts thereof, the stroke amounts of the front and rear cushion pins 36 and 37, and the like.
  • the movement timing and amount of movement of the lower mold upper side pad 35, the upper mold lower side pad 44, and the upper mold upper side pad 45 can be controlled. This may be set according to the shape of the product.
  • the upper die 40 is raised to a substantially top dead center position by the die driving device 50. Thereafter, the workpiece W blanked into a predetermined shape is conveyed by, for example, a robot, and the contact surface 32a of the front blank holder 32, the contact surface 33a of the rear blank holder 33, the contact surface 34a of the lower die lower side pad 34, and It is placed on the contact surface 35 a of the lower mold upper side pad 35.
  • the upper mold work gripping portion 56, the upper mold work gripping portion 57, the contact surface 44a of the upper mold lower side pad 44, and the contact surface 45a of the upper mold upper side pad 45 are substantially the same height. .
  • the upper die 40 is lowered by the die driving device 50, and the upper die workpiece gripping portion 56, the upper die workpiece gripping portion 57, the upper die lower side of the die 41 are lowered.
  • the contact surface 44a of the side pad 44 and the contact surface 45a of the upper die upper side pad 45 are lowered while maintaining substantially the same height.
  • the lower die lower side pad 34 and the lower die upper side pad 35 are energized by the lower die lower side gas spring 38 and the lower die upper side gas spring 39, respectively, and the upper die lower side pad 44 and the upper die upper side pad 45.
  • the urging forces of the upper mold lower side gas spring 48 and the upper mold upper side gas spring 49 are set to be stronger than the urging forces of the lower mold lower side gas spring 38 and the lower mold upper side gas spring 39. Therefore, in the first stage of drawing, the lower mold lower side gas spring 38 and the lower mold upper side gas spring 39 are contracted, and the upper mold lower side gas spring 48 and the upper mold upper side gas spring 49 are maintained without contracting. .
  • the effective stroke amount of the lower mold lower side gas spring 38 is set to about 75 mm
  • the effective stroke amount of the lower mold upper side gas spring 39 is set to about 35 mm.
  • an effective stroke amount of front and rear cushion pins 36 and 37 to be described later is set to about 135 mm.
  • the stroke amount is an example.
  • the front blank holder 32, the rear blank holder 33, the lower mold lower side pad 34, the lower mold upper side pad 35, the upper mold lower side pad 44, and the upper mold upper side pad 45 are In a state where the workpiece W is sandwiched, the punch moves down together with the punch 31 as much as the effective strokes of the lower die lower side gas spring 38 and the lower die upper side gas spring 39, and the drawing process starts on the entire circumference of the workpiece W.
  • drawing on the relatively deep drawing side is performed as follows.
  • the die 41 is also lowered while the lower mold lower side pad 34, the lower mold upper side pad 35, the upper mold lower side pad 44, and the upper mold upper side pad 45 are moved to the stationary state and kept in the stationary state.
  • the front blank holder 32 and the rear blank holder 33 are pushed downward by the lowering of the die 41 and the front and rear cushion pins 36 and 37 are contracted. Therefore, the front blank holder 32 and the rear blank holder 33 hold the workpiece W. It descends in the state. Drawing is continued until the front and rear cushion pins 36, 37 are stroked about 135 mm.
  • the lower mold lower side pad 34, the lower mold upper side pad 35, the upper mold lower side pad 44, and the upper mold upper side pad 45, and the front blank holder 32 and the rear blank holder 33 move differently. Due to this movement, the front and rear end face portions 10c where the inner panel 1 is deeply drawn is about 135 mm, the lower face portion 10b where the inner panel 1 is deeply drawn is about 75 mm, and the upper surface portion 10a is about 35 mm. Is done.
  • the upper mold 40 performs the ascending operation.
  • the ascending operations of the front blank holder 32 and the rear blank holder 33, the lower mold lower side pad 34, and the lower mold upper side pad 35 are performed in the same manner as when descending.
  • the upper mold lower side pad 44 and the upper mold upper side pad 45 hold the work W from the bottom dead center to 60 mm and 100 mm, respectively, while the front blank holder 32 and the rear blank holder 33 work on the other parts. W may be pushed up, and the inner panel 1 as a product may be damaged. Therefore, when the upper die 40 is raised, a lock mechanism (not shown) is required for moving the upper die lower side pad 44 and the upper die upper side pad 45 in synchronization with the die 41. Since this lock mechanism has a conventionally well-known structure, description thereof is omitted.
  • the inner panel 1 is taken out by, for example, a robot. Thereafter, the next workpiece W is input, one cycle is completed, and the process proceeds to the next cycle.
  • the above is the entire operation of one cycle of the drawing apparatus 20 according to this embodiment, and the inner panel 1 is continuously and automatically produced by repeating this cycle.
  • the front blank holder 32 is formed so as to go around from the first molding surface 31b side to the second molding surface 31c side on the outer periphery of the punch 31, and in the contact surface 32a.
  • the inner edge portion 32c is characterized by having a shape along the curved surface 31d of the punch 31.
  • the front blank holder 32 and the lower mold lower side pad 34 have contact surfaces 32a and 34a having substantially the same height. Waiting to The workpiece W is placed on the contact surfaces 32a and 34a, and the upper die 40 starts to descend, and the upper die workpiece gripping portion 56 of the die 41 and the contact surface 44a of the upper die lower side pad 44 are on the upper surface of the workpiece W. When abutting, the peripheral portion of the workpiece W is sandwiched in the thickness direction by the urging forces of the gas springs 38 and 39 and the front and rear cushion pins 36 and 37.
  • the front blank holder 32 and the lower die lower side pad 34 are both lowered while the predetermined tension acts on the workpiece W as described above, and the workpiece W is drawn.
  • the effective stroke 75 mm of the lower die lower side gas spring 38 is finished, the lower die lower side pad 34 stops descending, and the front blank holder 32 continues to be further drawn by about 60 mm in this state.
  • the material may be reduced during drawing. Since deformation may occur in the shrinking direction, there is a limit to setting the die face according to the product shape in consideration of the occurrence of wrinkles during molding.
  • the front blank holder 32, the rear blank holder 33, and the lower mold lower side pad 34 according to the drawing depth can be set as the lower mold
  • the inflow of material is small in the portion where the drawing depth is shallow, the material sandwiched between the lower die lower side pad 34 and the lower die upper side pad 35, the upper die lower side pad 44 and the upper die upper side pad 45 is used. Can be reduced.
  • the front blank holder 32 and the lower mold lower side pad 34 are arranged with a predetermined clearance S (shown only in FIG. 5) in the horizontal direction in the vicinity of this portion, so that the front blank holder 32 and the lower mold lower side pad 34 are arranged. The undesired force applied to the material can be minimized by the different operation.
  • a predetermined R shape is formed on one part of the lower mold side pad 34 adjacent to the front blank holder 32.
  • the front blank holder 32 is moved from the first forming surface 31b having a deep drawing depth on the outer periphery of the punch 31 to the second forming surface having a shallow drawing depth.
  • the inner edge portion 32 c of the contact surface 32 a of the front blank holder 32 with respect to the workpiece W is formed along the curved surface 31 d of the punch 31. Accordingly, since the workpiece W can be pulled along the curved surface 31d of the punch 31 during the drawing, it is possible to avoid complication of the mold shape when drawing the portions having different drawing depths. However, the occurrence of cracks and wrinkles on the workpiece W can be suppressed, and the yield can be further improved.
  • FIG. 12 is a simulation result image when the inner panel 1 is formed by the drawing apparatus 20 according to the embodiment of the present invention.
  • the boundary part 10e of the part 10c is shown. As is apparent from this image, almost no wrinkles are seen in the boundary portion 10e of the panel body 10 during drawing and the peripheral portion thereof.
  • Comparative Example 1 shown in FIG. 13 is a simulation result image at the same timing as when the inner panel is formed by a drawing apparatus in which the front blank holder does not go around to the lower side.
  • the sill-shaped surplus portion of the mold extends linearly in the direction of arrow D in FIG. 13, so that the front blank holder has the lower surface portion 10b of the panel body 10 being drawn and The material of the boundary portion of the front end portion 10c cannot be pulled appropriately, and wrinkles are generated in the boundary portion.
  • Comparative Example 2 shown in FIG. 14 is a case where the inner panel is formed by a drawing apparatus having a shape in which the lower side pad extends linearly to the front blank holder side.
  • the lower side pad of this comparative example 2 extends linearly in the direction of arrow E in FIG. 14, and therefore when the front blank holder continues drawing after the lower side pad stops, the boundary portion 10e The material cannot be pulled moderately, and wrinkles are generated at the boundary portion.
  • the present invention is applied to the production of the inner panel 1 in the above embodiment.
  • the product is not limited to the inner panel 1, and various panel-like parts having different drawing depths.
  • the present invention can be applied to the production of
  • the present invention can be applied not only to a panel-like part having a shallow drawing depth only on two side surfaces, but also to a panel-like part having a shallow drawing depth on one side or three sides. is there.
  • the drawing apparatus according to the present invention can be used when, for example, a panel-like part such as an inner panel of an automobile door is formed.

Abstract

La présente invention concerne un dispositif d'étirage qui est configuré pour permettre d'effectuer différentes opérations sur un support d'ébauche 32 et un tampon 34, le support d'ébauche 32 étant formé pour entrer dans une deuxième surface de moulage 31c ayant une profondeur d'étirage superficielle par rapport à une première surface de moulage 31b ayant une profondeur d'étirage profonde au niveau d'une périphérie externe d'un moule 31. Une partie de bord interne 32c d'une surface de contact 32a de mise en contact de pièce de fabrication du support d'ébauche 32 a une forme qui est conforme à une surface de moulage incurvée 31d du moule.
PCT/JP2018/005291 2017-03-17 2018-02-15 Dispositif d'étirage WO2018168311A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2019505791A JP6767063B2 (ja) 2017-03-17 2018-02-15 絞り成形装置

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2017052067 2017-03-17
JP2017-052067 2017-03-17

Publications (1)

Publication Number Publication Date
WO2018168311A1 true WO2018168311A1 (fr) 2018-09-20

Family

ID=63523767

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2018/005291 WO2018168311A1 (fr) 2017-03-17 2018-02-15 Dispositif d'étirage

Country Status (2)

Country Link
JP (1) JP6767063B2 (fr)
WO (1) WO2018168311A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11628484B2 (en) * 2019-03-28 2023-04-18 Honda Motor Co., Ltd. Press forming method

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01127118A (ja) * 1987-10-21 1989-05-19 Daimler Benz Ag 板金部品の絞り加工用プレス
JPH0475620U (fr) * 1990-11-14 1992-07-02
DE19954310A1 (de) * 1999-11-11 2001-05-31 Daimler Chrysler Ag Verfahren zum schnellen Regeln von Ziehvorgängen in Pressen und hierzu geeignete Ziehpresse
JP2003094119A (ja) * 2001-09-25 2003-04-02 Nippon Steel Corp プレス成形金型およびプレス成形方法
JP2004249365A (ja) * 2003-01-31 2004-09-09 Nippon Steel Corp 薄板のプレス金型装置及びプレス成形方法
JP2012157866A (ja) * 2011-01-28 2012-08-23 Toyota Motor Corp プレス成形装置およびプレス成形方法
JP2017001040A (ja) * 2015-06-04 2017-01-05 株式会社ヒロテック 絞り成型装置

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01127118A (ja) * 1987-10-21 1989-05-19 Daimler Benz Ag 板金部品の絞り加工用プレス
JPH0475620U (fr) * 1990-11-14 1992-07-02
DE19954310A1 (de) * 1999-11-11 2001-05-31 Daimler Chrysler Ag Verfahren zum schnellen Regeln von Ziehvorgängen in Pressen und hierzu geeignete Ziehpresse
JP2003094119A (ja) * 2001-09-25 2003-04-02 Nippon Steel Corp プレス成形金型およびプレス成形方法
JP2004249365A (ja) * 2003-01-31 2004-09-09 Nippon Steel Corp 薄板のプレス金型装置及びプレス成形方法
JP2012157866A (ja) * 2011-01-28 2012-08-23 Toyota Motor Corp プレス成形装置およびプレス成形方法
JP2017001040A (ja) * 2015-06-04 2017-01-05 株式会社ヒロテック 絞り成型装置

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11628484B2 (en) * 2019-03-28 2023-04-18 Honda Motor Co., Ltd. Press forming method

Also Published As

Publication number Publication date
JP6767063B2 (ja) 2020-10-14
JPWO2018168311A1 (ja) 2019-11-07

Similar Documents

Publication Publication Date Title
CN109414745B (zh) 冲压部件的制造方法及制造装置
EP2198986B1 (fr) Procédé de traitement par presse et appareil de traitement par presse
KR101846760B1 (ko) 프레스 성형 장치, 이 성형 장치를 이용한 프레스 성형품의 제조 방법, 및 프레스 성형품
JP4972374B2 (ja) プレス加工装置およびプレス加工方法
JP2010167480A (ja) プレス成形用金型及びプレス成形方法
KR101915829B1 (ko) 프레스 성형방법 및 프레스 성형장치
JP6028885B1 (ja) プレス成形方法及びプレス成形装置
WO2008047764A1 (fr) Procédé et appareil de travail à la presse
JP2011083807A (ja) 断面ハット状部品の製造方法
WO2015002077A1 (fr) Dispositif de moulage à la presse et procédé de moulage à la presse
JP2013027894A (ja) フレーム部品の製造方法及びフレーム部品
CN111112454A (zh) 一种翼子板制件回弹尺寸控制方法
JP2011067841A (ja) 中空柱状部品の製造方法
JP2015066584A (ja) プレス成形方法及びプレス成形金型
JPH091254A (ja) 引き伸ばし制御成形装置及び金属半製品成形法
JP2017001040A (ja) 絞り成型装置
JP2009190075A (ja) プレス成形方法
JP2019122992A (ja) プレス成形装置及びアウタパネル
JP5000256B2 (ja) プレス加工方法およびプレス加工装置
CN112313020A (zh) 冲压成形品的制造方法
WO2018168311A1 (fr) Dispositif d'étirage
JP2015006679A (ja) プレス成型方法及びプレス成型金型装置
JP6355128B2 (ja) プレス成形方法
JP7246349B2 (ja) プレス成形方法及びプレス成形金型
WO2019138684A1 (fr) Matériau d'ébauche, procédé de moulage à la presse de matériau d'ébauche et dispositif de moulage à la presse

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 18766591

Country of ref document: EP

Kind code of ref document: A1

ENP Entry into the national phase

Ref document number: 2019505791

Country of ref document: JP

Kind code of ref document: A

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 18766591

Country of ref document: EP

Kind code of ref document: A1