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
  • 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
  • B21D19/082—Flanging or other edge treatment, e.g. of tubes by single or successive action of pressing tools, e.g. vice jaws for making negative angles
  • B21D19/084—Flanging or other edge treatment, e.g. of tubes by single or successive action of pressing tools, e.g. vice jaws for making negative angles with linear cams, e.g. aerial cams
• • 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
  • B21D28/24—Perforating, i.e. punching holes
  • B21D28/32—Perforating, i.e. punching holes in other articles of special shape
  • B21D28/325—Perforating, i.e. punching holes in other articles of special shape using cam or wedge mechanisms, e.g. aerial cams
• • 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
  • B21D37/00—Tools as parts of machines covered by this subclass
  • B21D37/10—Die sets; Pillar guides
  • B21D37/12—Particular guiding equipment, e.g. pliers; Special arrangements for interconnection or cooperation of dies

Definitions

• the present invention relates to a press stamping tool for performing technical operations on a sheet metal part. It applies in particular, but not limited to stamping parts of automotive body structures.
• a stamping press tooling comprising a vertically movable upper frame relative to a lower frame, a first lower cam ramp mounted vertically movably guided to the lower frame, a second lower slider, referred to as a bushel, with a ramp cam and mounted movably guided to the lower frame.
• the second slide carries at its end opposite to the ramp cam a working tool for performing technical operations on a sheet metal part, the ramp cam of the second slide cooperating with the ramp cam of the first slide to move in horizontal translation the second slide to the sheet metal part when the first slide is vertically lowered by the upper frame descending to the lower frame.
• a cylinder for example of the gas type, is interposed vertically between the lower frame and the first slide to ensure the recovery of the latter when the upper frame of the press back once the sheet metal part stamped.
• the lift cylinder of the first slide after a number of stamping operations, can suffer a loss of pressure or deflation preventing the ascent of the slide, thus implying the cancellation of the transformation of the sheet metal part, the stop of the production and the disassembly of the tools for intervention.
• the present invention aims to overcome the above drawbacks of the known stamping press tooling.
• the pressing press tooling comprising a vertically movable upper frame relative to a lower frame, a first ramped cam slider mounted vertically movable to the lower frame, a second slider to ramped cam mounted movable to the lower frame and carrying at its opposite end to the ramped cam a working tool for performing technical operations on a sheet metal part, the ramped cam of the second slide cooperating with the ramped cam of the first slider for moving the second slider towards the sheet metal part when the first slider is vertically lowered by the upper frame descending towards the lower frame, is characterized in that the upper frame comprises, integral with it, a control block adapted to come into contact on the first slide to lower it vertically during the descent of the upper frame towards the inferior frame and the first slider comprises a controlled member for locking the first slider to the control block of the upper frame when the latter substantially reaches its bottom dead position, the locking member being held in its locking position of the first slider to control block when raising the upper frame.
• the locking member comprises a hook-shaped end arm pivotally mounted to the first slider about a horizontal axis integral with the first slider and pivotable to its locking position of the first slider to the slider block.
• control under the action of an abutment secured to the upper frame and to which the hook-shaped end is engaged and held in a notch of the control block by the abutment bearing on the pivoting arm when the upper frame substantially reaches its bottom dead position.
• the abutment comprises a vertical end face bearing on a flat front face of an external boss of the pivoting arm to engage and maintain the hook-shaped end of the pivoting arm in the notch of the control block. .
• the front face of the abutment and the flat face of the boss of the pivoting arm are in contact with each other following the same vertical height at the holding position of the hook-shaped end in the notch from the control block.
• the end face of the abutment is delimited by two upper and lower chamfers and the flat face of the boss of the pivoting arm is delimited by two upper and lower chamfers, the lower bevel of the boss cooperating with the upper chamfer of the abutment.
• the unlocking member is interposed between the first slide and the pivoting arm and is controlled to disengage the hook-shaped end of the notch of the control block when the boss face of the pivoting arm leaves the front face stop when raising the upper frame.
• the unlocking member is a horizontal cylinder whose cylinder is secured to the first slide and the rod is articulated to the pivoting arm.
• a jack is interposed between the lower frame and the first slider to allow the raising of the slider during the ascent of the upper frame.
• FIG. 1 is a partial perspective view of a stamping press tooling comprising, according to the invention, security locking means to ensure the recovery of the slide of this tool;
• Figure 2 is a more detailed view of the circled portion II of Figure 1;
• FIG. 3 is an exploded perspective view showing the security locking means of the invention with the open tooling;
• - Figure 4 is a sectional view in the vertical plane passing through line IV-IV of Figure 3;
• - Figure 5 is a perspective view similar to that of Figure 3 and showing the descent of the stamping press
• - Figure 6 is a view similar to that of Figure 5 and showing the locking means occupying their locking position of a portion of the upper frame of the press to the slider;
• - Figure 7 is a perspective view similar to that of Figure 6 and showing the rise of the upper frame of the stamping press; and - Figure 8 is a perspective view of a stop of the lower frame of the stamping press for controlling the locking means of the invention.
• reference numeral 1 denotes stamping press tooling for performing technical operations on a sheet metal part, not shown, which may be intended for a body structure of a motor vehicle.
• the stamping press tooling 1 comprises an upper frame 2 and a lower frame 3, the upper frame 2 being vertically movable relative to the lower frame 3 in a manner guided by vertical guide feet, partially represented at 4, secured to the lower frame and engaging in bores of the upper frame, Figure 1 showing the upper frame 2 to its bottom dead center position of stamping a sheet metal part.
• the stamping press tool also comprises a first slider 5 mounted vertically movable to the lower frame 3 by means of guide means known per se, such as for example slides.
• the first slider 5 carries at its lower end a cam ramp 6.
• the pressing press tooling 1 further comprises a second lower slider 7, called plug, movably mounted to the lower frame 3 by means of translation guide means, known per se, such as for example slides, and allowing the guided sliding of the second slider 7 in a horizontal direction.
• the second slider 7 comprises a cam ramp 8 at one of its ends and carries at its opposite end a working tool, not shown, for performing technical operations on a sheet metal part, such as for example a punching operation or a trimming operation of this piece.
• the ramped cam 8 of the second slider 7 cooperates with the ramped cam 6 of the first slider 5 to move the second slider 7 to the sheet metal part when the first slider 5 is vertically lowered by the upper frame 2 descending towards the lower frame 3 from its open position of the press tool 1 to allow the work tool to perform the appropriate technical operation on the sheet metal part.
• the second slider 7 is shown as being movable in horizontal translation to the lower frame, but it can be moved in inclined translation relative to this frame according to the type of technical operation to be performed on the sheet metal part by the tool working.
• a cylinder V for example of the gas type, is interposed vertically between the lower frame 3 and the first slider 5 to allow, under normal operating conditions of the first slider, the ascent of the slider during the ascent of the frame superior 2.
• the upper frame 2 comprises a block 9 for controlling the vertical displacement of the first slider 5 and which is removably fixed, for example by fastening screws, not shown, to a horizontal face 10 of the upper frame 2 extending below it in a vertical direction above a horizontal upper planar face 11 of the first slider 5.
• the control block 9 has in one of its lateral faces a notch 12 whose role will be explained later.
• the first slider 5 comprises a controlled member 13 for locking the first slider 5 to the control block of the upper frame 2 when the latter substantially reaches its position of bottom dead center stamping of the sheet metal part, the body locking 13 being maintained in its locking position of the slider 5 to the control block 9 during the ascent of the upper frame 2 to a predetermined height.
• the locking member 13 comprises an arm 14 with a hook-shaped end 15 pivotally mounted to a corresponding lateral and vertical face of the slide 5 and able to pivot relative to the slide under the action of a abutment 16 secured to the lower frame 3 at a locking position of the slider 5 to the control block 9, at which position the hook-shaped end 15 of the arm 14 is engaged and held in the notch 12 by the abutment 16 in support on the pivoting arm 14 when the upper frame 2 substantially reaches its bottom dead position.
• the arm 14 is pivotally mounted to the first slider 5 via a horizontal axis 17 passing through a lower end portion of the arm opposite the hook-shaped upper end 15 of this arm and secured to a support screed 18 removably fixed, for example by unrepresented fixing screws, to the corresponding lateral face of the first slide 5.
• the pivoting arm 14 comprises an outer boss 19 having a planar front face 20 delimited, considering the arm 14 to a substantially vertical position, by two upper and lower chamfers 21 and 22.
• the first slider 5 also comprises a member 23 for pivoting the arm 14 to its unlocking position of the control block 9 of the first slider 5.
• the unlocking member 23 is constituted by a horizontal cylinder, for example of the gas type, the cylinder 24 is secured in an upper housing 5a of the first slider 5 and the rod 25 is connected in an articulated manner the pivot arm 14 substantially in the middle thereof.
• the stop 16 comprises a sole 26 removably attached to a vertical face 27 of the lower frame 3 by fixing screws, not shown.
• the abutment 16 further comprises a portion 28 projecting from the sole 26 and which has a flat and vertical front face 29 delimited between an upper chamfer 30 and a lower chamfer 31.
• the vertical plane face 29 of the stop 16 has a predetermined height h as is symbolized by the double arrow in Figures 7 and 8.
• FIG. 3 represents the situation in which the press tooling 1 is open, that is to say that the upper frame 2 and the control block 9 occupy an upper position released from above the lower frame. 3 and to which the workpiece to be converted by stamping is deposited on the punch, not shown, of the press tooling 1.
• the upper frame 2 of the tool 1 is controlled to descend vertically to the lower frame 3 until the lower horizontal planar face 9a of the control block 9 bears on the upper planar face 1 1 of the first slide 5 and the lower chamfer 22 of the boss 19 of the arm 14 bears on the upper chamfer 30 of the abutment 16 to allow the arm 14 to initiate its pivoting towards the control block 9 along its axis 17 as shown in FIG. Figure 5.
• the upper frame 2 of the tool 1 is controlled to descend vertically to the lower frame 3 until the lower horizontal planar face 9a of the control block 9 bears on the upper planar face 1 1 of the first slide 5 and the lower chamfer 22 of the boss 19 of the arm 14 bears on the upper chamfer 30 of the abutment 16 to allow the arm 14 to initiate its pivoting towards the control block 9 along its axis 17 as shown in FIG. Figure 5.
• the upper frame 2 of the tool 1 is controlled to descend vertically to the lower frame 3 until the lower horizontal planar face 9a of the control block 9 bears on
• FIG. 6 represents the situation in which the upper frame 2 is lowered vertically with the slider 5 at its bottom dead position on the lower frame 3 to carry out a technical operation on the sheet metal part and, at this position, the stop 16 has pivoted the arm 14 to its locking position of the control block 9 on the first slider 5 to which the hook-shaped end 15 of this arm is engaged in the conjugate notch 12 of the control block 9
• the end face 20 of the boss 19 of the locking arm 14 is in intimate contact with the vertical end face 29 of the abutment 16 to maintain the hook-shaped end 15 of the arm 14 in its engaged position.
• the two end faces 20 of the boss 19 and 29 of the stop 16 are in contact with each other at the same height h.
• the upper frame 2 is controlled to go up vertically and normally the first slide 5 must go up under the force of the cylinder V, but if this function can not be assumed because of a loss of pressure in the jack V or seizure of the first slider 5, the locking by the arm 14 of the control block 9 at the first slider 5 will effectively raise the first slider 5 during the ascent of the upper frame 2 according to a force including to overcome the blocking jamming of the slider.
• Figure 7 shows the rise of the upper frame 2 at a given height relative to the lower frame 3 to which the cylinder 23 will move its rod 25 to allow pivoting of the arm 14 to its unlocked position of the control block 9, primed as soon as the lower chamfer 22 of the boss 19 of this arm engages on the upper bevel 30 of the abutment 16 to then occupy its completely disengaged position from above the abutment 16 shown in FIG. 3.
• the height h of the abutment 16 determines the rise height of the first slider 5 during which the control block 9 is still locked to the first slider 5 until the face 20 of the boss 19 leaves the front face 29 of the abutment 16 as clearly shown in Figure 7.
• the invention described above thus has the following advantages: - it ensures optimal security since it no longer requires operator intervention to unlock the slide with, therefore, eliminating any risk of bodily injury. 'operator,

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Mounting, Exchange, And Manufacturing Of Dies (AREA)

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Family Cites Families (4)

• 2014
  • 2014-03-20 FR FR1452338A patent/FR3018708B1/fr active Active
• 2015
  • 2015-02-10 EP EP15709529.0A patent/EP3119541A1/de not_active Withdrawn
  • 2015-02-10 WO PCT/FR2015/050318 patent/WO2015140429A1/fr active Application Filing

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