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
  • B21D28/02—Punching blanks or articles with or without obtaining scrap; Notching
  • B21D28/16—Shoulder or burr prevention, e.g. fine-blanking
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T83/00—Cutting
  • Y10T83/566—Interrelated tool actuating means and means to actuate work immobilizer
  • Y10T83/5669—Work clamp
  • Y10T83/5787—Clamp driven by yieldable means
  • Y10T83/5805—Fluid pressure yieldable drive means
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T83/00—Cutting
  • Y10T83/869—Means to drive or to guide tool
  • Y10T83/8821—With simple rectilinear reciprocating motion only
  • Y10T83/8858—Fluid pressure actuated
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T83/00—Cutting
  • Y10T83/929—Tool or tool with support
  • Y10T83/9411—Cutting couple type
  • Y10T83/9423—Punching tool
  • Y10T83/9425—Tool pair

Definitions

• the invention relates to a device for fine cutting workpieces made of a material with a press plate under the pressure of a ring prong cylinder with a ring prong and a cutting die guided in the press plate, to which a cutting plate with a counterholder (ejector) is assigned on a ram.
• a fineblanking tool essentially consists of a press plate with a ring spike in which a cutting punch is guided. Opposite the cutting punch is assigned a counterholder or ejector in a cutting plate. A workpiece, for example a metal sheet, is inserted between the press plate and the cutting punch or the cutting plate and counter-holder. The upper and lower parts of the tool are closed and the material is clamped inside and outside the cutting line by means of a ring spike and counterforce. Pressing plate and cutting plate are guided relative to the cutting punch and counterholder, thus cutting out the workpiece from the material. After cutting out, the tool is opened and the workpiece is usually ejected from the cutting plate using the counterholder.
• the force of the ring-toothed cylinder which is usually arranged in the upper crosshead of the machine stand, counteracts the cutting force.
• the counterholder cylinder which is integrated in the ram or in the working piston, also presses the workpiece against the upper part of the tool, the counterholder support force also counteracts the cutting force.
• the counter force of the ring prong cylinder can be up to 50% and that of the counter holder up to 25% of the work force. But this significantly reduces the performance of the entire device.
• DE 196 42 635 AI proposes that ring-toothed and counter-holder cylinders be arranged in a modified manner, the ring-toothed cylinder being integrated in a separate crossbar above the stand and connected to the plunger via columns, so that it is synchronous with the plunger moved up.
• the counter-holder cylinder is in turn arranged between the plunger and a lower crosshead of the stand, no relative movement taking place between the counter-holder cylinder and the stand during the working stroke, so that the Counterholder cylinder support forces are absorbed by the machine stand.
• the present invention has for its object to provide a device of the type mentioned above, in which the ring tooth cylinder force is compensated in a simple manner and the structure of which is considerably simplified.
• the plunger is supported against at least one compensation cylinder which is hydraulically connected to the ring-toothed cylinder.
• the compensation cylinder is designed so that it is in hydraulic equilibrium with the ring-toothed cylinder. This means that the compensating cylinder absorbs and compensates the ring-toothed cylinder force with each key stroke, so that it has no influence on the actual key stroke.
• the counterforce generated by the compensation cylinders should be appropriate distribute several compensation cylinders.
• four compensation cylinders are envisaged, however, depending on the press and embodiment, more or fewer compensation cylinders are possible.
• the compensation cylinder is firmly connected to the plunger via a piston rod on a piston. It is exposed to the same pressure as a piston in the ring-toothed cylinder, the easiest way to establish this pressure equilibrium is that an effective cross-sectional area of the compensation piston corresponds to the effective cross-sectional area of the rag-toothed cylinder. As a result, no additional pressure supply elements are required to maintain the same pressures on both pistons. It is sufficient if the two working spaces of the ring-point cylinder and the compensation cylinder are hydraulically connected to one another via a line. The equal-sized cross-sectional areas of the pistons then exert an equal-sized pressure on the press plate or the cutting plate or the plunger.
• the ring-toothed cylinder is arranged on a crosshead of the machine frame, so that an additional traverse is not required. This means that the mass moved during a ram stroke is significantly lower, so that the energy consumption per stroke and the weight of the machine can be kept significantly lower. No additional connecting frame (crossbeam) is required, so that the construction is much simpler and cheaper.
• an oil tank can be connected to the connection via a corresponding logic valve, so that a briefly required high amount of oil can be sucked in from the oil tank via the logic valve can.
• a fem cutting tool 8 is provided, as is generally known.
• a fem cutting tool 8 is provided, as is generally known.
• Such a fineblanking tool 8 has a cutting die 9 which is guided in a press plate 10.
• This press plate 10 has a ring spike 11 for the sheet 1 hm.
• the press plate 10 is supported against an annular prong piston 12 in an Rmgzackenzylmder 13.
• the Rmgzackenzylmder 13 is located in a corresponding housing 14 on the crosshead 3, wherein the ring-point piston 12 is connected via a piston rod 15 and various pressure plates and plungers, not identified in more detail, through the crosshead 3 to the press plate 10.
• the die 9 is assigned a counterholder 16, which can also serve as an ejector.
• the hydraulics for pressurizing this counter-holder 16 will not be described in more detail here. A description can be found in the above manual.
• the counter holder 16 is guided in a cutting plate 17, the cutting punch 9 pushing the workpiece to be cut out into this cutting plate 17, the counter holder 16 evading.
• the stroke of the plunger 7 in the direction of the double arrow 18 is effected via two master cylinders 19.1 and 19.2, in each of which a piston 20.1 and 20.2 is guided. Each piston 20.1 and 20.2 is firmly connected to the plunger 7 via a piston rod 21.1 and 21.2.
• the tappet 7 is also supported against preferably four compensation cylinders 22, only one of which is described below.
• a compensation piston 23 is guided, which in turn is firmly connected to the plunger 7 via a piston rod 24.
• the compensation piston or pistons 23 has an effective cross-sectional area which corresponds to that of the ring-toothed piston 12.
• the Rmgzackenzylmder 13 and the Kompensationszylmder 22 are coupled to one another via a hydraulic connection 25.
• An oil tank, not shown, can be connected into this hydraulic connection 25 via a further connection 26 and a logic valve 27.
• the two master cylinders 19.1 and 19.2 are connected to one another and via an valve 28 to an oil tank (not shown in more detail).
• the plunger 7 is raised by means of the two master cylinders 19.1 and 19.2, the sheet metal 1 being clamped between the cutting plate 17 and the pressing plate 10.
• the ring prong 11 prints itself in the sheet 1 em.
• the forces emanating from the toothed cylinder 13 are neutralized by the compensating cylinder 22, since their pistons together have the same effective cross-sectional area as the ring-toothed cylinder piston 12.
• the cutting punch 9 prints the workpiece to be cut into the cutting plate 17, the counter-holder 16 giving way.
• the machine opens and the counter-holder 16 can eject the workpiece from the cutting plate 17.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Press Drives And Press Lines (AREA)
• Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
• Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
• Punching Or Piercing (AREA)
• Control And Other Processes For Unpacking Of Materials (AREA)
• Disintegrating Or Milling (AREA)

Applications Claiming Priority (3)

Publications (2)

Family

ID=7912526

Family Applications (1)

Country Status (8)

Families Citing this family (19)

Family Cites Families (19)

• 1999
  • 1999-06-25 DE DE19929163A patent/DE19929163C1/de not_active Expired - Fee Related
• 2000
  • 2000-06-20 US US10/018,609 patent/US7806031B1/en not_active Expired - Fee Related
  • 2000-06-20 DE DE50001335T patent/DE50001335D1/de not_active Expired - Lifetime
  • 2000-06-20 AT AT00947859T patent/ATE233176T1/de active
  • 2000-06-20 EP EP00947859A patent/EP1189745B1/fr not_active Expired - Lifetime
  • 2000-06-20 WO PCT/EP2000/005681 patent/WO2001000396A2/fr active IP Right Grant
  • 2000-06-20 AU AU61510/00A patent/AU6151000A/en not_active Withdrawn
  • 2000-06-20 JP JP2001506085A patent/JP2003503208A/ja active Pending
  • 2000-06-20 CN CN00809361A patent/CN1455712A/zh active Pending

Non-Patent Citations (1)

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