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
  • B21D28/00—Shaping by press-cutting; Perforating
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B30—PRESSES
  • B30B—PRESSES IN GENERAL
  • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
  • B30B15/0058—Inclinable presses
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B30—PRESSES
  • B30B—PRESSES IN GENERAL
  • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
  • B30B15/04—Frames; Guides
  • B30B15/047—C-shaped frames

Definitions

• the present invention relates to a punching tool, intended in particular for punching sheets.
• Known tools of this type include a striking head, a punch and a die, the whole being mounted inside a support structure.
• the sheet to be punched is placed between the punch and the die and the striking head acts on the punch to punch the sheet.
• the punching tools have an inverted U shape, lying horizontally, called a swan neck.
• the sheet metal to be punched takes place between the two branches of the U, the matrix is at the end of a branch of the U and the punch is located opposite the matrix, at the end of the other branch of the U.
• the support structure of the tool comprises two side plates in the form of a swan neck, an upper plate and a lower plate. Inside this structure which carries the striking head, the punch and the matrix take place which are connected to each other by an element in the form of a swan neck.
• the object of the invention is then to provide a punching tool with a lighter but just as rigid structure, in which the change of the punch and of the die can be carried out without difficulty.
• a punching tool comprising a striking head, at least one punch mounted in a punch holder, a matrix as well as a structure carrying these elements having a general shape of U, also called swan neck , the striking head and the punch holder located at the free end of a branch of the U, facing the matrix located at the free end of the other branch of the U.
• the structure carrier is a tubular structure, pivotally mounted, about an axis substantially perpendicular to the branches of the U, on a support.
• the supporting structure is tubular makes it possible to have increased rigidity compared to the punching tools of the prior art, while being lighter. However, this closed structure no longer allows access as on the tools of the prior art at the level of the die and the punch holder.
• the invention therefore provides for making the pivoting supporting structure, so that after pivoting it is possible to access these elements.
• the support structure can pivot between a position where the branches of the U are substantially horizontal and a position where they are substantially vertical, in the latter position, the striking head, the punch and the die being at the top of the support structure . Access to these various elements is then easy.
• the punch holder and the die are removably mounted on the supporting structure.
• the support structure has two tubular branches of substantially rectangular section connected together by a tubular base of substantially rectangular section.
• the support on which the supporting structure is mounted is advantageously movable in translation.
• the support is provided with pads intended to slide on guide rails.
• the invention proposes that the support is fixed to a toothed belt passing over a grooved control shaft and a driven pulley.
• a stop is provided on the side of the base of the U, in addition the support structure has on each side a post, and the stop includes a cutout, intended to receive the post when the support structure is against the stop and to guide the support structure during its pivoting.
• FIG. 1 is a view in longitudinal section thereof, along the section line I-I of FIG. 2,
• FIG. 2 is a sectional view along the section line II-II of FIG. 1,
• Figure 3 is a sectional view along the section line III-III of Figure 2
• Figure 4 is a side view showing the punching tool of Figure 1 in the tilted position.
• the punching tool shown in FIGS. 1 to 4 comprises a striking head 2, a punch holder 4 provided with a punch 6 and a die 8. All of these elements are mounted in a support structure 10.
• the supporting structure 10 has an inverted U shape, the branches of which are substantially horizontal. The free space between the branches of the u is intended for the passage of a sheet to be punched. As a result, the gap between the branches is reduced. This form is commonly called "swan neck".
• the supporting structure 10 comprises an upper branch 12 and a lower branch 14 which are substantially horizontal, as well as a substantially vertical base 16 connecting the two horizontal branches 12, 14. As shown in Figures 1 and 2, the supporting structure 10 is tubular. Each branch and the base are of substantially rectangular sections. A reinforcing wall 18 is provided to separate each branch 12, 14 from the base 16.
• the upper branch 12 of the support structure carries at its free end the striking head 2 and the punch holder 4, while the other branch 14 door at its free end, facing the punch holder 4, the matrix 8. All of these elements are removably mounted on the support structure 10.
• the striking head 2 operates with an electric motor.
• a conventional impact head using a hydraulic cylinder can be used.
• the striking head 2 has a slide 20 which acts on the punch 6 to punch the sheet.
• the slide 20 is mounted eccentrically on a shaft of a first pulley 22.
• the latter is connected by a connecting rod 24 to a second pulley 26, the connecting rod 24 and the pulley 26 being mounted eccentrically one relative to the other.
• the two pulleys 22 and 26 are rotated by a toothed belt 28 passing over a third pulley 30.
• the latter is driven by a motor 32.
• a reduction is achieved between the output shaft of the motor 32 and the third pulley 30.
• the carrying structure 10 is pivotally mounted about an axis 34 on a support 36.
• the latter is movable in translation in the preferred embodiment shown in the drawing and moves parallel to the branches 12,14 of the structure carrier.
• the pivoting of the supporting structure 10 takes place when the support 36 is at the end of its travel on the side of the base 16 (FIG. 4).
• a fixed stop 38 and a pin 40 integral with the support structure 10 are provided.
• the pin 40 comes against the stop 38.
• the latter is provided with a notch 42 in which the pin 40 is housed.
• the bottom of this notch 42 communicates with a slot 44 serving as a guide for the pin 40 when the carrying structure 10 pivots about its axis 34.
• the slot 44 is such that the pin comes into abutment at the bottom of the slot when the supporting structure 10 has rotated 90 °.
• the pivoting to go from Figure 1 to Figure 4 takes place in the counterclockwise direction, so that the punch holder 4 and the die 8 are found in the upper position.
• the support 36 is provided with guide pads 46 and is guided on rails 48. These rails are substantially parallel to the branches 12, 14 of the punching tool.
• the support 36 is driven on the rails by by means of a toothed belt 50, a splined drive shaft 52 and a driven pulley 54.
• the toothed belt 50 is a linear belt, the two ends of which are fixed to a profile 56 integral with the movable support 36 and passing over the control shaft 52 and the driven pulley 54.
• the control shaft 52 is driven by a motor, not shown, making it possible to know exactly the angular position of the control shaft 52 and therefore of the support 36 and of the punch 6
• the displacement of the support 36 not only makes it possible to pass the punching tool from a working position (FIG. 1) to a maintenance position (FIG. 4), but it also makes it possible to perform punching at different distances from the edge of a sheet, without moving it.
• the mobility of the punching tool is facilitated by the relatively small mass of the tool.
• the structure and design of this tool make it light while being rigid to withstand the stresses exerted during punching.
• the tubular structure and the possibility of pivoting allow, with respect to a punching tool of the prior art as described in the preamble to the present patent application, on the one hand to have a lighter support structure and on the other part to remove the element connecting the matrix to the punch holder.
• the forces exerted are collected by the side plates of the support structure.
• the tubular structure of the tool according to the invention makes it possible, from a resistance point of view, of the materials to stiffen the support structure without increasing its mass.
• the pivoting design of the support structure allows access to the punch holder and the die and to change these when one wishes to make punches with other punches. It goes without saying that the invention is not limited to the embodiments of a punching tool described above by way of nonlimiting examples; on the contrary, it embraces all its variants.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)

Applications Claiming Priority (3)

Publications (1)

Family

ID=9493922

Family Applications (1)

Country Status (3)

Families Citing this family (1)

Family Cites Families (3)

• 1996
  • 1996-07-05 FR FR9608640A patent/FR2750627B1/fr not_active Expired - Fee Related
• 1997
  • 1997-07-07 EP EP97932852A patent/EP0912326A1/de not_active Withdrawn
  • 1997-07-07 WO PCT/FR1997/001228 patent/WO1998001288A1/fr not_active Application Discontinuation

Non-Patent Citations (1)

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