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
  • B21D24/16—Additional equipment in association with the tools, e.g. for shearing, for trimming
• • 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
  • B21D19/00—Flanging or other edge treatment, e.g. of tubes
  • B21D19/08—Flanging or other edge treatment, e.g. of tubes by single or successive action of pressing tools, e.g. vice jaws
• • 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
  • B21D19/00—Flanging or other edge treatment, e.g. of tubes
  • B21D19/12—Edge-curling
  • B21D19/14—Reinforcing edges, e.g. armouring same
• • 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
• • 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
  • B21D53/00—Making other particular articles
  • B21D53/88—Making other particular articles other parts for vehicles, e.g. cowlings, mudguards

Definitions

• the present invention relates to a machine for forming metal stampings having an edge portion folded over on itself.
• the subject of the present invention is a machine for forming a metal stamping, the essential characteristics of which are set forth in claim 1, and whose preferred and/or auxiliary characteristics are indicated in claims 2-5.
• FIGS. 1 to 7 are cross-sections of the machine which is the subject of the present invention, in respective forming steps;
• figure 8 in particular is a cross-section along the line VIII-VIII of figure 1.
• FIG. 1-7 a machine for forming metal stampings according to the present invention is indicated as a whole with 1.
• the machine 1 comprises a movable upper die holder 2 on which an upper die half 3 is mounted, and a fixed lower die holder 4 on which a lower die half 5 is mounted.
• the upper die holder 2 is movable with respect to the lower die holder 4, to operate two guide columns 6, each of which has a first end attached to the upper die holder 2 and a second end attached to the lower die holder 4.
• the upper die half 3 and the lower die half 5 comprise respective, mutually complementary, forming surfaces 3a and 5a, the coupling of which defines the shape of the metal stamping S.
• the machine 1 comprises an upper clamping yoke 7 mounted on the upper die holder 2 and a lower clamping yoke 8 mounted on the lower die holder 4.
• the upper clamping yoke 7 is arranged so as to surround the upper die half 3 and moves integrally with it.
• lower clamping yoke 8 is arranged so as to surround the lower die half 5.
• the upper clamping yoke 7 and lower clamping yoke 8 mutually cooperate in the clamping operation of the edge portion of a sheet that will constitute the stamping.
• the machine 1 comprises an edge cutting/bending unit 9 arranged so as to surround the upper die half 3 and the lower die half 5 and positioned in a space between the two die halves and the two clamping yokes 7 and 8.
• the edge cutting/bending unit 9 comprises a cutting blade 10 which is specifically arranged to surround the upper die half and is positioned between it and the upper clamping yoke 7.
• the cutting blade 10 is attached to a handling plate 11, which is in turn attached to the upper die holder 2.
• the upper die holder 2 comprises a plurality of damper pistons 12 which make possible the movement of the handling plate 11 and therefore of the cutting blade 10 even when the upper die half 3 has reached the end of its travel onto the lower die half 5.
• the edge cutting/bending unit 9 comprises an outer bending blade 13 which is arranged to surround the lower die half 5 and is positioned between it and the lower clamping yoke 8.
• the outer bending blade 13 is attached to a handling plate 14 on which the plurality of pistons 15 act.
• the outer bending blade 13 is arranged directly below the cutting blade 10 in such a way that the vertical movement of the cutting blade must be accompanied by an opposite movement of the outer bending blade 13 and vice versa.
• the outer bending blade 13, having a thickness greater than that of the cutting blade 10 forms with the latter a step G facing toward the lower die half 5.
• this step G serves a function in a first and a second bending operation of the edge portion.
• the edge cutting/bending unit 9 comprises an inner bending blade 16 which is arranged to surround the lower die half 5 and is positioned between it and the outer bending blade 13.
• the inner bending blade 16 is attached to a handling plate 17 on which a piston 18 acts.
• the inner bending blade 16 has an oblique upper surface 19. As described below, the inner bending blade 16 has the function of completing the operation of the edge portion bending on itself .
• the outer bending blade 13 and the inner bending blade 16 have two respective toothed sliding surfaces 13a and 16a which are mutually interlocked and arranged to slide against each another.
• the teeth of the toothed sliding surfaces 13a and 16a have a trapezoidal shape.
• the machine is brought into its closed position by the operation of the two guide columns 6.
• the upper clamping yoke 7 is arranged in abutment on the lower clamping yoke 8 to achieve the clamping of the sheet L and, simultaneously, the forming surface 3a of the upper die half 3 is forced onto the forming surface 5a of the lower die half 5 thus moulding the sheet L to form the stamping S.
• the inner bending blade 16 moves downwards in order to leave the space necessary to achieve a second bending operation clearly shown in the enlargement of figure 5.
• the second bending operation is carried out by the upward movement of the outer bending blade 13 and therefore of the cutting blade 10, while the inner bending blade 16 remains stationary.
• the upward movement of the outer bending blade 13 carries out the second bending operation because the step G engages with the already folded edge portion, sliding and thus forcing it into a further bending inside the space left free by the downward movement of the inner bending blade.
• the stamping is completed with the edge portion folded and the machine 1 is returned to its open configuration (figure 7) and the stamping can be removed.
• the machine of the present invention makes possible a significant reduction in space and an equally significant reduction in throughput times .

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Bending Of Plates, Rods, And Pipes (AREA)
• Shaping Metal By Deep-Drawing, Or The Like (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=57133342

Family Applications (1)

Country Status (4)

Families Citing this family (3)

Family Cites Families (4)

• 2016
  • 2016-06-21 IT ITUA2016A004545A patent/ITUA20164545A1/it unknown
• 2017
  • 2017-06-21 US US16/306,760 patent/US20190176205A1/en not_active Abandoned
  • 2017-06-21 EP EP17751826.3A patent/EP3471903A1/en not_active Withdrawn
  • 2017-06-21 WO PCT/IB2017/053705 patent/WO2017221176A1/en unknown

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