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
  • B21D19/005—Edge deburring or smoothing
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B30—PRESSES
  • B30B—PRESSES IN GENERAL
  • B30B1/00—Presses, using a press ram, characterised by the features of the drive therefor, pressure being transmitted directly, or through simple thrust or tension members only, to the press ram or platen
  • B30B1/32—Presses, using a press ram, characterised by the features of the drive therefor, pressure being transmitted directly, or through simple thrust or tension members only, to the press ram or platen by plungers under fluid pressure
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B30—PRESSES
  • B30B—PRESSES IN GENERAL
  • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
  • B30B15/06—Platens or press rams
  • B30B15/062—Press plates
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B30—PRESSES
  • B30B—PRESSES IN GENERAL
  • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
  • B30B15/32—Discharging presses

Definitions

• the invention relates to a press, in particular for deburring a workpiece, comprising at least one press device with a press cylinder having a press piston rod and a hold-down cylinder with a hold-down piston rod, wherein the press piston rod is connected to a holder for a tool via a flange plate.
• Presses can be used to manufacture or process workpieces, such as deburring. Examples of such presses include... DE 27 53 360 A1 , the DE 10 2005 029 060 B3 or the EP 3 820 635 B1 to be taken.
• the presses can have an upper plate, called a yoke plate, at a fixed distance from a tabletop onto which a workpiece is attached.
• a press cylinder extends from this plate and is connected to a press plate, usually called a ram, which is guided along columns and adjusted towards the tabletop to perform the pressing operation.
• a hold-down device can be provided, which is usually arranged below and connected to a piston rod of the press cylinder.
• a hold-down device can be provided, which is usually arranged below and connected to a piston rod of the press cylinder.
• the hold-down device which is usually a hydraulic cylinder, runs below the press piston rod, the resulting presses have a large overall height, which can be as high as 8 m, for example, requiring appropriate structural measures for setting up the presses.
• JP 2015-147224 A is a hydraulic press that has two pistons, with a main piston connected to a cylinder of a second piston.
• a forging press after the DE 10 2016 103 927 A1 It has two cylinders, designated as the primary and secondary drives.
• the cylinder of the secondary drive extends partially inside the piston of the primary drive.
• a double-cylinder arrangement with a main cylinder and an ejection cylinder is the CN 101712207 A to be taken.
• the present invention is based on the objective of further developing a press of the aforementioned type in such a way that a compact design is achieved, whereby a trouble-free replacement of the hold-down cylinder should be possible.
• the invention essentially provides that the workpiece-side end face of the flange plate of the press piston rod has a passage opening through which the hold-down cylinder inserted in the press piston rod can pass, the hold-down cylinder housing being inserted in a blind opening extending from the workpiece-side end face of the press piston rod.
• the hold-down cylinder is not arranged below the press cylinder, but is integrated into the piston rod of the press cylinder.
• the hold-down cylinder housing is inserted into a recess in the press piston rod. This allows for easy replacement without having to remove the press piston rod itself.
• the overall height of the press is reduced compared to the standard height of the press.
• Technology in which the hold-down cylinder runs below the press cylinder significantly reduces the overall height. Reductions in overall height of up to 20% are easily achievable.
• the hold-down cylinder should not protrude beyond the end face of the press piston rod, although this would be possible up to the plane that is defined by the workpiece-side end face of the flange plate.
• the press cylinder is a single-acting cylinder, in particular a plunger cylinder.
• a plunger cylinder also known as a reciprocating piston cylinder, does not have a conventional piston. Instead, the piston rod itself acts as the piston. Plunger cylinders have a favorable mechanical efficiency.
• the press piston rod itself or in the case of a plunger cylinder, the piston, should be connected via the flange plate to the workpiece-side section of a ram, whereby the workpiece-side surface of the flange plate should be aligned with the surface of the ram facing the table.
• the plunger from which the tool required for machining or deburring extends, should be guided over four guide columns, with two diagonally opposite, and in particular exclusively two diagonally opposite, guide columns.
• Drive devices for adjusting the plunger are assigned, which are designed in such a way that a rapid return of the plunger to the starting position is made possible.
• Each drive unit should ideally be a hydraulic cylinder, but can also be designed, for example, as an electromechanical actuator.
• the time for the ram movement up and down in rapid traverse is a significant part of a complete machining cycle and should therefore be between 1:4 and 1:7 in relation to the time of the pressing process.
• the piston surfaces of the press cylinder and the drive cylinders of the drive device(s) are designed accordingly.
• the drive mechanisms not only make it possible to quickly return the plunger to its starting position, but also to quickly move it towards the workpiece in order to then carry out the actual machining or deburring process via the press cylinder.
• a suction valve is provided in the supply line to the press cylinder.
• the invention is characterized in that the drive device is assigned a fall protection device which, in the case of a differential cylinder, surrounds the piston rod and should be based on the principle of mechanical friction or clamping.
• the fall protection device in question may be one distributed by SITEMA-Gesellschaft fürandtechnik und Maschinenbau mbH. This type of fall protection works primarily through mechanical friction and/or clamping.
• the flange plate connected to the workpiece-side end face of the press piston rod, which is connected to the plunger has the through-opening that can be passed through by the hold-down cylinder housing inserted in the press piston rod.
• channels carrying pressure medium should run in the flange plate to the hold-down cylinder.
• pressure medium channels required for actuating the hold-down cylinder run in the housing of the hold-down cylinder.
• deburring is the preferred application of the press, then It can also be used, for example, for cutting, compressing, and chipless forming of workpieces.
• the press 10 has a frame 11 with a table top 12 attached therein and an upper stationary plate, which is referred to as a yoke plate 14 and which is connected to the table top 12 by means of usually four guide columns forming the corners of a rectangle or square, two of which are shown and marked with the reference numerals 16, 18.
• a holder for a tool is adjustable, from which a tool (not shown) extends for machining a workpiece arranged on the table top 12.
• the workpiece is a casting that needs to be deburred.
• the ram 20 is connected to a piston rod 22 of a press cylinder 24, which is in particular a plunger cylinder.
• the press cylinder 24 extends stationary from the yoke plate 14.
• the piston rod 22 is connected to the ram 20 via a flange plate 26.
• the Fig. 1 the workpiece-side, i.e. table-top-side surface 28 of the flange 26 in the area of the workpiece-side area of the plunger 20.
• the workpiece-side surface 28 is flush or almost flush with the workpiece-side surface 30 of the plunger 20 or with a plane spanned by the workpiece-side area of the plunger 20.
• a hold-down device is provided in a known manner, which according to the invention is a hold-down cylinder 32 that is integrated into the press piston rod 22, as can be seen in particular from the detailed illustration according to Fig. 2 results.
• a preferably stepped recess 36 extends from the workpiece-side end surface 34, which runs as a table-side, into which the hold-down cylinder 32 can be inserted, which should be a differential cylinder with piston 38 and piston rod 40.
• the cylinder housing 42 of the hold-down cylinder 32 is connected to the press piston rod 22 via a ring flange 44.
• the end face 34 of the piston rod 22 is also connected to the flange plate 26, which in turn is connected to the plunger 20.
• a bore 48 for a fastening screw is shown for illustrative purposes only.
• Another bore 50 for a fastening screw to the piston rod 22 is also shown.
• the flange plate 26 has a central through-opening 52, the diameter of which is such that the hold-down cylinder 32 can be removed from the press piston rod 22 or inserted into the opening 36 without removing the flange plate 26.
• the workpiece-side end face of the piston rod 40 is set back in the retracted state from the outer surface 28 of the flange 26 and thus also from the workpiece-side surface 30 of the plunger 20.
• Channels 54 and 56 run through the flanges 26 and 44 and in the housing wall of the hold-down cylinder housing 42 to actuate the differential cylinder, i.e., the hold-down cylinder 32.
• This is self-explanatory and also follows from the schematic diagram of the Fig. 2 .
• the pressure medium connection for the plunger cylinder 24 is located in the end face 58 of the piston cylinder housing 60, facing away from the table top.
• a suction valve is provided in the supply line.
• drive units are provided, one of which is located in the Fig. 1 depicted and designed as a differential cylinder 62. According to the invention, two corresponding drive units 62 are provided, arranged diagonally. Opposite guide columns run, one of which is marked with the reference number 18.
• At least one fall protection device 64 is provided, which in the exemplary embodiment runs along one of the guide columns to which a drive unit is not assigned. In the exemplary embodiment, a corresponding fall protection device 64 runs along column 16.
• two fall protection devices 64 are present along the diagonally opposite guide columns, along which drive units do not extend.
• the drive units 62 enable rapid opening of the press 10. Adjustment of the ram 20 towards the worktable 12 before the pressing or deburring process is also possible via the drive units 62. Due to the significantly smaller cross-section of the piston of the differential cylinder 62 compared to the cross-section of the press piston rod 22, a rapid traverse is effectively provided.
• the invention results in a significantly lower overall height of the press compared to known presses of the same pressing force, thus reducing the required structural measures at the installation site.
• a structurally uncomplicated drive type is provided, whereby a thick-walled tube can be used as the housing 60.
• the integration of the hold-down cylinder 32 into the press cylinder 24 or the piston rod 22 offers not only an advantage in terms of the overall height of the press 10, but also design simplifications.
• Rapid opening is achievable because, when differential cylinders are used as the additional drive units, pistons are employed that have a significantly smaller piston area compared to presses where the press cylinders act as Differential cylinders are designed, which are used to both close and open the press.
• Two hydraulic movements can be performed simultaneously: those of the drive unit(s), particularly in the form of the differential cylinders, and those of the press cylinder. These movements can overlap when the press closes, resulting in faster closing.
• the cylinders are hydraulic cylinders.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Physics & Mathematics (AREA)
• Fluid Mechanics (AREA)
• Press Drives And Press Lines (AREA)

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Publications (1)

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ID=95744363

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Citations (11)

• 2024
  • 2024-05-31 DE DE102024115234.6A patent/DE102024115234A1/de active Granted
• 2025
  • 2025-05-23 EP EP25178534.1A patent/EP4656366A1/fr active Pending

Patent Citations (11)

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