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
  • B21D24/02—Die-cushions
• • 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
• • 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 invention relates to a die cushion device according to the preamble of patent claim 1.
• proportional or servo valves are used to control or regulate the pressures in the sheet holder holders and thus to control the sheet holder force
• the sheet holder cylinder being assigned a sensor which, via a control unit, the desired pressure change in the sheet holder cylinder in dependence of the respective drawing progress by means of the proportional or servo valves controls.
• DE 32 42 705 C2 discloses a single-acting drawing press in which the pressure cheek arranged in the press table can be acted upon by a plurality of cylinder units with locally different cushion force, in order in particular to machine asymmetric large drawn parts with locally different desired forces can.
• a different pullability in the respective regions of a workpiece can be achieved by a specific change in the drawing gap.
• different pressures for plate holding can thus be produced. It follows a power regulation for a differentiated support of the pressure cheek, which forwards the different force to the sheet holding device or the workpiece.
• a press to be used for drawing and deep drawing operations is also known, which is likewise designed as a single-acting press and whose hydraulically supported pressure cheek acts on the lower part of the tool or the drawing punch.
• the drawing process on the drawing punch can be influenced in the sense of sheet metal deformation by targeted pressure influencing of the pressure cheek.
• a disadvantage of these embodiments is the coupling of the individual drive motors.
• it is necessary in the case of parts which are difficult to be formed to subject the individual pressure points to different forces which are variable during the drawing process.
• Both of the above-described electrically operated drawing cushions have the disadvantage that they require a large installation space due to the large number of mechanical movement transmission means, which as a rule is not present.
• the invention is based on the object, starting from the prior art, to improve a die-cushion device in such a way that the control behavior is improved when the control effort is reduced, and that in the case of a possible lent compact design a variable force distribution on the blank holder is made possible.
• the core idea of the invention is to utilize both the advantages of the hydraulic drawing cushions and of the electrically driven drawing cushions. This is achieved by a Zieh ⁇ pillow device according to hybrid system in a combination of fluid cylinders and one or more acting on the pressure cheekenden- electric drives, the fluid cylinder the Kraft ⁇ function at a high level and the electric drive Wegfunk ⁇ tion, such as Pre-acceleration and acceleration, and the Kraftfunk ⁇ tion at a low level with deactivated fluid cylinders accepts.
• the force and / or travel function of the electric drive can be transmitted to the pressure cheek on the one hand by means of a linear motor designed as a direct drive and on the other hand by means of a servomotor with mechanical translation.
• the linear motors can be arranged, for example, centrally between the fluid cylinders in the inner region of the pressure cheek. Due to the direct energy conversion into a linear Weg ⁇ function can be dispensed with laborious mechanical, increased inertial Mente ments causing translations.
• the secondary part belonging to the linear motor is fastened to the pressure cheek, which, depending on the force requirement, faces one or more primary parts mounted in the press table. It is also possible to arrange the linear motors in the outer region of the pressure cheek. In this case, the secondary part can be mounted both on the pressure cheek, as well as in the press table.
• the external linear motor makes it possible, in the case of applications of multi-part pressure cheeks, to share primary or secondary parts by means of adjacent die cushion devices.
• linear motors instead of linear motors are servomotors with a mechanical translation as a linear translator, for example, as E lektrozylinder with spindle and spindle nut applicable, which are preferably arranged centrally between the fluid cylinders and operatively connected to the pressure cheek.
• a mechanical translator for example, as E lektrozylinder with spindle and spindle nut applicable, which are preferably arranged centrally between the fluid cylinders and operatively connected to the pressure cheek.
• a rack with pinion and a lever mechanism between servo motor and pressure cheek are possible.
• the electric drives for coordination with the movement of ram and Werk Swisstransportelemen- th via a guide shaft with the system control, whereby a permanent position control within the Wegfunkti ⁇ ones can be realized.
• a motor brake operatively connected to the electric drive can be activated.
• energy recovery is possible as braking energy during a force application or during cushion run-up into the electronic network or into the energy circuit of the press.
• Figure 1 die cushion device according to hybrid system with Linear ⁇ motors outside the pressure cheek as Thomasdarstel ⁇ ment.
• Figure 2 die cushion device according to hybrid system with Linear ⁇ motor within the pressure cheek as Thomasdarstel ⁇ ment.
• Figure 3 die cushion device according to hybrid system with electric cylinder as a sectional view.
• Figure 4 path-time diagram for die cushion device according to hybrid system
• FIG. 1 shows, in a simplified representation, the cut-out of a press with a die-cushioning device 2 arranged in the press table 1 as a multi-point embodiment.
• the longitudinally guided in the press table 1 pressure cheek 3 is connected via pressure pin 4 with the plate holder 5 of the lower tool in operative connection.
• tappet-directed, blank holder force between Druck ⁇ cheek 3 and press table 1 fluid cylinder 6 are arranged.
• the sectional view shows the first row with four fluid cylinders 6 of a total of eight-point drawing device.
• the pressure cheek 3 is moved downwards by the movement of the tappet, the control of the blank-holder force along the pulling path being effected by a valve-controlled displacement of the fluid from the fluid cylinders 6.
• electric motors 15 are linear motors 7 whose primary and secondary parts 8, 9 are used Preferably between press table 1 and pressure cheek 3 are arranged.
• the need-based arrangement of the primary parts 8 on the pressure cheek 3 or on the press table 1 is possible.
• a plurality of linear motors 7 can be arranged along the pressure cheek 3. In this case, the linear motors 7 can either simultaneously take over the guiding function of the pressure cheek 3 or the primary and secondary parts 8, 9 are arranged independently of additional guide elements.
• adjacent pressure cheeks use a common primary or secondary part.
• the associated secondary parts are operatively connected to the pressure cheeks of the adjacent die cushion device. It is also conceivable to arrange the secondary parts on the pressure cheeks, which are in operative connection with an intermediate, jointly usable primary part.
• the linear motor 7 is arranged to generate the path function in the inner region of the pressure cheek 3, approximately centrally between the fluid cylinders 6.
• FIG. 3 shows a die-cushion device 2 according to a third embodiment with an electric cylinder 10 acting on the pressure cheek 3.
• the electric cylinder 10 is arranged approximately centrally in the middle between the surrounding fluid cylinders ⁇ .
• a spindle / spindle nut system 12, 11 is used in this embodiment.
• the connected to the pressure cheek 3 spindle nut 11 is ros ⁇ fixed, and axially synchronous with the pressure cheek 3 movable.
• the associated spindle 12 is axially fixed in the press table 1 rotatably mounted.
• the remote from the spindle nut 11 end of the spindle 12 is connected via a coupling 13 with a servo motor 14 in operative connection. It is also possible to dispense with additional transmission elements and to use the extended shaft of the spindle as the rotor of the servomotor 14.
• the sheet metal holder 5 Before placing the upper tool on the lower tool, not shown, on the sheet metal holder 5 located in the lower tool, the sheet metal holder 5 is pre-accelerated with the blank or molded part intended for forming in order to avoid a disadvantageous impact load in the direction of the push movement.
• the electric drive 15, either as servomotor 14 or linear motor 7, is actuated in operative connection with a position measuring system or via a guide shaft for plunger movement, so that after a defined acceleration path the upper tool acts on the plate holder 5 with a remaining relative speed. After building up a defined pressure in the fluid cylinders 6, the drawing force required for forming the blank or the molded part is achieved.
• the movement of the pressure cheek 3 is done passively during the drawing process by the movement of the plunger.
• both the pulling force per fluid cylinder 6 can be varied in this drawing phase, as well as time-varying pulling forces between adjacent fluid cylinders 6 can be set in accordance with the technological requirements.
• the moving elements of the electric drive 15 are either in an idle phase during this drawing process or can regenerate energy by switching to the generator mode in an advantageous manner.
• the pressure cheek 3 follows the upwardly directed plunger movement synchronously in order to eject the re-formed drawn part.
• the direction of movement of the electric drive or 15 is changed and the Duck cheek 3 is actively driven in the engine mode.
• the fluid cylinders 6 are deactivated on the pressure side in this phase.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Shaping Metal By Deep-Drawing, Or The Like (AREA)
• Press Drives And Press Lines (AREA)
• Bedding Items (AREA)
• Actuator (AREA)
• Portable Nailing Machines And Staplers (AREA)
• Vending Machines For Individual Products (AREA)

Applications Claiming Priority (2)

Publications (2)

Family

ID=34972652

Family Applications (1)

Country Status (9)

Families Citing this family (8)

Family Cites Families (14)

• 2004
  • 2004-06-24 DE DE102004030678A patent/DE102004030678B4/de not_active Expired - Fee Related
• 2005
  • 2005-06-18 ES ES05761755T patent/ES2306179T3/es active Active
  • 2005-06-18 JP JP2007516963A patent/JP5101276B2/ja not_active Expired - Fee Related
  • 2005-06-18 EP EP05761755A patent/EP1758696B1/fr not_active Not-in-force
  • 2005-06-18 KR KR1020077001806A patent/KR101012817B1/ko not_active IP Right Cessation
  • 2005-06-18 WO PCT/DE2005/001094 patent/WO2006000188A1/fr active IP Right Grant
  • 2005-06-18 CN CNB2005800212606A patent/CN100548524C/zh not_active Expired - Fee Related
  • 2005-06-18 DE DE502005003912T patent/DE502005003912D1/de not_active Expired - Fee Related
  • 2005-06-18 AT AT05761755T patent/ATE393674T1/de active
  • 2005-06-18 BR BRPI0512612-6A patent/BRPI0512612A/pt not_active IP Right Cessation

Non-Patent Citations (1)

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