Classifications

• • 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
  • B30B15/041—Guides
• • 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
  • B30B1/26—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 cams, eccentrics, or cranks
  • B30B1/28—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 cams, eccentrics, or cranks the cam, crank, or eccentric being disposed below the lower platen or table and operating to pull down the upper platen or slide
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B30—PRESSES
  • B30B—PRESSES IN GENERAL
  • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
  • B30B15/0064—Counterbalancing means for movable press elements

Definitions

• the present invention relates to the field of stamping and forming technology. It relates to a device for punching and / or forming of sheets, wires and the like. According to the preamble of claim 1.
• Universal presses For performing punching and / or forming steps in sheets, metal strips, wires or the like.
• Universal presses are often used, which have a table on which a guided in the vertical direction, motor or hydraulic driven ram can be lowered cyclically. Between the table and the plunger are usually commercially available, among the so-called Normally falling column racks used, each having an upper and lower part for receiving the actual tools.
• Upper and lower part of the column frame are guided in the vertical movement relative to each other by a plurality (eg 2, 3 or 4) of guide columns.
• the upper part of the pillar frame is firmly connected to the plunger of the press, the lower part fixed accordingly on the table.
• One of these configurations includes an eccentric or crank drive located above the ram and usually equipped with a large flywheel that provides the heavy ram with a smooth motion. Because in this configuration, large and moving masses are present above the column frame, the press must be made very stable beyond the table, so that the forces occurring during the punching process can be safely collected. At the same time, however, it must be taken into account that there is sufficient access to the table to be able to feed the material to be processed into the work area and, if necessary, to replace tools or pillar racks.
• One possibility for this is provided by the so-called C-presses, whose frame has the shape of a C open on three sides.
• the one-sided design of the C-presses can lead to deformation when high pressing forces are exerted.
• Another possibility is a columnar structure in which the superstructure of the machine is carried by columns arranged at the corners of the generally rectangular table. If a flywheel is present, special measures must be taken to be able to stop the press in an emergency in the shortest possible time. These are - combined with brakes - usually used quick release clutch mechanisms, which are arranged between flywheel and ram, and are triggered in an emergency.
• the forces transmitted via the tie rods to the plunger are generated by a common frame movably disposed below the table, to which the tie rods passing through the table are fastened.
• the tie rods are added in the manner of a connecting rod individually via crank or eccentric drives in an up and down movement, which is transmitted to the plunger.
• four tie rods expediently engage at the corners of the plunger.
• the tie rods are combined in pairs. The tie rods of both pairs rotate in opposite directions, so that lateral forces on the plunger are compensated.
• the heavy ram represents a large moving mass, which causes significant vibrations during cyclic movement, a restless running of the machine results and leads to corresponding noise emissions.
• the ram must be guided vertically above the table, which not only means a considerable design effort, but also claimed space and difficult access to the working space of the press.
• a flywheel is used inside the drive, special precautions must be taken for the rapid shutdown of the press during emergency stop.
• An essential feature of the invention is that the device has a lower drive, and that the coupling of the tensile forces via tie rods and without ram takes place directly on the upper part of a column frame in which the tools are housed. The device does not need any
• the lower drive is preferably designed so that the tensile force is generated individually for each of the tie rods, and that the tensile force of each tie rod is generated by an associated eccentric or crank drive.
• the four tie rods distribute the force on the tool. Even with off-center power requirements, the tool closes absolutely parallel. Due to the opposing tie rods, the lateral forces are released on the guide system of the column frame. The direct introduction of force from the four tie rods on the tool eliminates the large mass of the ram. This achieves a very quiet running of the machine. As the four tie rods work in opposite directions, the moving masses of the tie rods are released in the horizontal axis.
• the direct drive of the eccentric shafts eliminates the Flywheel. Further eliminates the clutch and brake, which require maintenance by the wear.
• the tie rods of a tie rod pair are connected to each other at the upper end by a horizontally extending pressure bar, which pressure bar is rotatably mounted with its ends in each of the tie rods, wherein the pressure bar for coupling the tensile forces is bolted to the upper part of the column frame.
• the sub-drive is preferably housed in a sub-frame, and the table is arranged on top of the sub-frame.
• the sub-drive comprises a drive motor and a plurality of parallel shafts, wherein the sub-frame has two opposite side walls, and the drive motor and the shafts are mounted in the side walls.
• a further embodiment of the invention is characterized in that the column frame is substantially rectangular, that within the column frame four guide columns are provided, which are placed in the area of the four corners of the column frame, and that the tensile forces are coupled respectively in the immediate vicinity of the guide columns in the upper part of the column frame.
• the column frame can be driven in a particularly effective and reliable manner if the tensile forces are coupled into the upper part of the column frame close to the point where the forces for punching or forming within the column frame are required.
• FIG. 1 in a simplified side view of an embodiment of a
• Fig. 2 shows the device of Fig. 2 in another view with the view into the interior of the undercarriage.
• FIGS. 1 and 2 show different side views of a pressing device according to a preferred embodiment of the invention.
• the device 10 comprises a table 15 arranged on the upper side of a lower frame 11, on which a commercial pillar frame 16 is mounted.
• the base 11 consists essentially of a rectangular Base plate 12 and two parallel, opposite side walls 13 and 14 (Fig. 2), which are mounted vertically on the base plate 12.
• the table 15 rests on the side walls 13, 14 on top and is supported by them.
• an undercut which is made in one piece, for example as a cast part.
• Under the base plate 12 can be provided at the corners height adjustable feet 41, 42, 42 'to compensate for unevenness of the floor when setting up the device.
• a lower drive which comprises a drive motor 20 and a plurality of shafts 23, 27 and 28 having gear.
• eccentric drives 29, 30 are four tie rods 31, 32, 32 'driven individually, the downwardly directed tensile forces (simple arrows in Fig. 2) directly into the column frame 16.
• the shafts 23, 27 and 28 are rotatably mounted in the side walls 13, 14 of the undercarriage 11 by means of suitable bearings 39, 40.
• the drive motor 20 is mounted in the side walls 13, 14 and protrudes with its motor shaft 46 from the side wall 14 to the outside.
• a first gear which drives a toothed belt 21, a seated on the shaft 23 second gear 22.
• a third gear 26 is rotatably disposed in the interior of the undercarriage 11, which meshes with a fourth gear 25 on the shaft 27.
• the fourth gearwheel 25 meshes with an equally large fifth gearwheel 26 on the shaft 28, so that the shafts 27 and 28 rotate at the same speed but opposite.
• the gears 24, 25 and 26 are hidden in the view of FIG. 1 per se of the side wall 14, but are drawn for better visibility because of solid (in Fig. 2, the shaft 23 with the gears 22 and 24 is omitted entirely to release the view of the wave 27).
• the pillar frame 16 comprises a lower part 17 and a top 19. With the flat underside of the lower part 17, the pillar frame 16 rests on the table 15 and is releasably secured on the table 15 by means of clamping claws or the like.
• Lower part 17 and upper part 19 are connected to each other by a plurality of columns 18.
• the columns 18 guide the upper part 19 precisely in the vertical direction when it is displaced relative to the lower part 17.
• upper part 19 and lower part 17 are rectangular and four columns 18 are provided, which are placed at the corners of the column frame 16.
• the pillar frame may also have another basic shape. Likewise, only two or three, or even more than four columns may be present to guide the upper and lower parts 19 and 17 of the pillar frame 16 relative to one another during the punching or forming process. Between the columns 18 of the pillar frame 16 is the actual working space 44, in which the attached to the upper and lower part 19, 17 tools are housed.
• the inventive direct initiation of the tensile forces generated in the individual eccentric drives 29, 30 and transmitted by the tie rods 31, 32, 32 'into the column frame 16 takes place on the upper side of the upper part 19.
• preferably two extending transversely over the upper part 19, on the upper side resting pressure bar 33, 34 are provided, which are screwed at several points with the upper part 19.
• the pressure bars 33, 34 protrude laterally beyond the upper part 19 at both ends with circular-cylindrical sections.
• the invention provides a device for punching and / or forming, which is characterized by the following advantages:
• the compact design allows the machines to be housed in a sound- and vibration-isolating housing, thus reducing the strain on people and the environment to an absolute minimum.
• the machine If the machine is driven by servo motor and secured by sensor technology, it can be in the fault or emergency stop area be stopped within a few degrees of the eccentric. The minimal use of momentum forces thus allows optimum protection for people and tools.
• Masses of tie rods suspended in the horizontal axis Masses of tie rods suspended in the horizontal axis.
• the machine can be stopped in a very short time.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Press Drives And Press Lines (AREA)

Applications Claiming Priority (2)

Publications (2)

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• 2006
  • 2006-06-16 AT AT06741654T patent/ATE523326T1/de active
  • 2006-06-16 EP EP06741654A patent/EP1893401B1/fr not_active Not-in-force
  • 2006-06-16 WO PCT/CH2006/000329 patent/WO2006136045A1/fr not_active Ceased

Non-Patent Citations (1)

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