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
  • B21D17/00—Forming single grooves in sheet metal or tubular or hollow articles
  • B21D17/02—Forming single grooves in sheet metal or tubular or hollow articles by pressing
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B44—DECORATIVE ARTS
  • B44B—MACHINES, APPARATUS OR TOOLS FOR ARTISTIC WORK, e.g. FOR SCULPTURING, GUILLOCHING, CARVING, BRANDING, INLAYING
  • B44B5/00—Machines or apparatus for embossing decorations or marks, e.g. embossing coins
  • B44B5/0004—Machines or apparatus for embossing decorations or marks, e.g. embossing coins characterised by the movement of the embossing tool(s), or the movement of the work, during the embossing operation
  • B44B5/0019—Rectilinearly moving embossing tools
  • B44B5/0028—Rectilinearly moving embossing tools cooperating with rotating workpieces

Definitions

• the present invention relates to an embossing machine according to the preamble of claim 1, a method for embossing workpieces according to the preamble of claim 7 and the use of such an embossing machine.
• Embossing machines have long been known in various designs.
• the main tool of these machines is a punch, which is brought into contact with the workpiece, which is usually placed on or against a die, by applying pressure to a defined depth.
• the embossing achieves a plastic deformation of the material in the area of the workpiece.
• an indentation is created on the side of the stamp and, if necessary, an indentation on the side of the die.
• the forces to be applied for this are conventionally transmitted either mechanically via an eccentric shaft or hydraulically directly to the stamp.
• the conventional mechanical machines generally have very large dimensions, since the force has to be built up and transmitted directly at the location of the stamp, and are therefore suitable for processing large individual parts.
• the hydraulic machines can be separated from the pressure build-up Stamp is made, also be made smaller and are also suitable for processing smaller parts.
• This machine is particularly well suited for relatively small hollow cylindrical workpieces, in which the punchings, respectively. Embossings must be carried out rotationally symmetrically along a single, defined radius.
• the machine has disadvantages due to its fixed workpiece holder which can only be rotated about an axis. So the workpiece must be repeated several times in succession in several such machines for the different punching or Embossing positions can be set up and used separately. This means a disadvantageously large effort and long production times.
• the use of hydraulic machines is also unsuitable for such workpieces due to the high manufacturing tolerances involved.
• the embossing holding time necessary to achieve a precise embossing depth depends on various parameters, the precise compliance of which cannot be guaranteed.
• the object of the present invention was to find an embossing machine which allows precise, rapid embossing, in particular of rotationally symmetrical workpieces, the embossing at different radial positions with mutually different wall inclinations or. Curvatures must be performed.
• the workpiece holder can be moved in one plane relative to the machine frame and can also be pivoted about an axis perpendicular to this plane, the workpiece can be brought into the corresponding machining position quickly and easily.
• the processing of the embossments can preferably be accomplished simply by arranging the holding mandrel of the workpiece to be rotatable in the workpiece holder.
• This rotary drive which is advantageously provided with a control for exact positioning, is preferably accommodated directly in the workpiece holder.
• a counter-holder which is designed to be rotatable, is preferably attached in the workpiece holder. This ensures reliable and rotationally fixed fixing of the workpiece in the workpiece holder. At the same time, the workpiece can also be easily attached to the workpiece holder. remove from this.
• a sensor is preferably used in order to make embossments spaced apart from one another with respect to the circumferential line on the workpiece. This sensor, preferably an optical sensor, is advantageously arranged directly on the workpiece holder and detects the position of the embossings already carried out. On the basis of this information, by means of an appropriately configured control which controls the rotation of the holding mandrel, it is possible, simply and precisely, to pivot the workpiece into the correct position for the subsequent stamping process.
• Such workpieces are, for example, converter plates for use in automatic transmissions, such as those used in large numbers in vehicles.
• converter plates for use in automatic transmissions, such as those used in large numbers in vehicles.
• these are relatively small workpieces in which the embossing must be carried out with high precision, since these serve to hold the guide vanes.
• the inventive embossing machine has a feed or. Removal device for the workpieces, which automatically feeds the workpieces to the workpiece holder or. removed after editing.
• a processing station essentially has the stamp and associated die as well as an associated workpiece holder on.
• the transport from one processing station to the next can take place, for example, through the feed and removal device. It is thus advantageously possible to achieve high production rates even with workpieces with multiple, different embossing forms, which have to be produced with different stamps and dies.
• the preferred detection of the already existing embossings allows further embossings to be carried out quickly and with high precision with different stamps or on another circumferential line.
• the workpiece holder can be moved and swiveled precisely and with high speed and precision at the designated positions on the respective workpiece.
• Show it 1 shows the schematic longitudinal section through a machine according to the invention with a plate-shaped workpiece which is machined from the inside with the stamp;
• Fig. 3 shows the schematic longitudinal section in the region of the workpiece holder when loading with the workpiece.
• FIG. 1 The longitudinal section through an embossing machine according to the invention is shown schematically in FIG.
• the workpiece 1 to be machined is held in a workpiece holder 15 which is connected to the machine frame 16.
• the workpiece 1 is held rotatable about its axis of symmetry w.
• the eccentric shaft 4 is driven via a drive shaft 3, for example as a cardan shaft.
• the eccentric shaft 4 is arranged coaxially with the control disk 5.
• the control disk 5 has a control track in the form of a circumferential groove 6 on its underside.
• the groove 6 can be designed, for example, as a circumferential groove which is formed eccentrically to the axis of rotation of the eccentric shaft.
• the infeed of the infeed carriage 2 can be carried out, for example, via a threaded spindle 18 by a mechanical or electrical drive 19 which is connected to the machine frame 16 is firmly connected can be set in the direction of the axis h to the workpiece 1. This setting is preferably NC-controlled.
• the eccentric shaft 4 is mounted in the die frame 8, which is guided in the machine frame 16 and can be displaced parallel in the direction of the machining axis h.
• the die frame 8 is now periodically moved back and forth in its guide in accordance with the design of the groove 6 of the control disk 5, whereby the die 9 arranged at the end of the die frame 8 comes into abutment against the corresponding outside of the workpiece 1, respectively. is lifted off.
• this movement takes place with a larger or smaller path, in each case once per revolution.
• a connecting rod 10 is arranged on the eccentric pin 17 of the eccentric shaft 4 and is connected, for example, to the plunger arm 12 via a connecting pin 11.
• This punch arm 12 is also arranged in the radial direction with respect to the workpiece axis w in the die frame 8. During the rotation of the eccentric shaft 4, the stamp arm 12 is thus also moved back and forth once with each rotation and thus also the stamp 13 arranged at the end of the stamp arm.
• the arrangement of the eccentric shaft 4, control disk 5 and eccentric pin 17 shown results in a coupled, positively guided movement of both the die 9 and the punch 13, the relative movement of the punch 13 with respect to the workpiece 1 depending on the design and arrangement of the groove 6 the control disk 5 can be very small in relation to the stroke of the eccentric pin 17.
• the workpiece holder 15 is now designed according to the invention in such a way that the workpiece 1 is held in it both rotatably about the axis of symmetry w, but can also perform a vertical movement along the axis v and additionally a pivoting movement about the axis s, which is perpendicular to the axes h and v , can execute.
• Next stamp 13 and die 9 can be moved along the axis h. be positioned.
• plate-shaped workpieces 1 having a concave or convex surface on the edge can be processed particularly precisely and quickly by this machine.
• the starting position of the workpiece 1 can be easily determined and set by detecting the embossings already carried out, for example by means of an optical sensor. This means that non-contiguous embossings can be created quickly in a defined position with high precision. This is necessary, for example, for components of automatic transmissions, such as Converter plates, in which guide vanes must then be used in these embossings. This places very high demands on the precision of the embossing itself and its positioning on the workpiece 1.
• embossments with different configurations ie with different stamp shapes
• a device is provided in which several, for example two or three such embossing stations are arranged and operated parallel to one another, and the workpieces 1 after a complete one Processing at one of these stations can be fed to the next station.
• the workpieces 1 can thus be processed practically in parallel and a very high production rate can be achieved.
• FIG. 2 shows the machining area of the embossing machine according to the invention in a smaller detail.
• the workpiece 1 has already been brought into the desired machining position by moving and pivoting the workpiece holder 15.
• the position of the workpiece 1 to be machined lies exactly in the machining axis h of the embossing machine, ie between the punch 13 and the die 9.
• the interaction of the movements of the punch 13 and die 9 in a known manner can now trigger the stamping process, the position of workpiece 1 remains unchanged. Since usually several embossments along the circumferential circle of the workpiece 1 must be applied at regular, defined intervals, this can be done simply by rotating the workpiece 1 about the workpiece axis or.
• Mandrel axis w take place. So that the workpiece 1 does not come off the holding mandrel 20 in this position drops, a counter-holder 21 is provided, which presses the workpiece 1 reliably and secured against unwanted rotation against the holding mandrel 20.
• the counter-holder 21 is advantageously arranged axially movable on the workpiece holder 15 in order to also release the workpiece 1 again.
• the introduction of the workpiece 1 into this machining position can be seen from FIG. 2 on the basis of the starting position of the workpiece 1 ′ shown in dashed lines.
• the workpiece 1 In this position, the workpiece 1 is in a vertical position compared to the machining axis h and can be inserted from top to bottom between the punch 13 'and the die (not shown here).
• the workpiece 1 can then be brought into the position shown in FIG. 2 by combined lowering and pivoting, i.e. the position of the axis of rotation s' shifts to position s.
• the punch 13 and die 9 are moved together into their starting position.
• the workpiece holder 15 is pivoted such that the workpiece 1 comes to lie upward.
• the workpiece 1 is lowered downwards by a feed device 22 until it comes into contact with the holding mandrel 20.
• the counter-holder 21 can then be positioned over the workpiece 1 and pressed against the holding mandrel from above.
• the workpiece holder 15 can now be loaded in accordance with the preceding description. moves, ie be moved and pivoted, the workpiece 1 being held reliably.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Shaping Metal By Deep-Drawing, Or The Like (AREA)
• Shaping Of Tube Ends By Bending Or Straightening (AREA)
• Devices For Post-Treatments, Processing, Supply, Discharge, And Other Processes (AREA)

Applications Claiming Priority (1)

Publications (2)

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ID=33520331

Family Applications (1)

Country Status (5)

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• 2003
  • 2003-06-24 EP EP03729769A patent/EP1638711B1/fr not_active Expired - Lifetime
  • 2003-06-24 AU AU2003240353A patent/AU2003240353A1/en not_active Abandoned
  • 2003-06-24 DE DE50307842T patent/DE50307842D1/de not_active Expired - Lifetime
  • 2003-06-24 AT AT03729769T patent/ATE368538T1/de not_active IP Right Cessation
  • 2003-06-24 WO PCT/CH2003/000411 patent/WO2004112982A1/fr active IP Right Grant

Non-Patent Citations (1)

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