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
• • 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
  • B21D28/12—Punching using rotatable carriers
• • 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
  • B21D28/24—Perforating, i.e. punching holes
  • B21D28/246—Selection of punches

Definitions

• the invention relates to a punching machine with a feed device for the cyclical further movement of the material to be punched through the punching machine, with a series of tool elements, each of which has a die arranged in a die holder and a guide for a punch punch arranged at a distance above it, and with a the stamping head plate of the drive device.
• a punching machine of this type is known from the magazine “Bands, sheets, tubes” (1976), pages 448 to 450.
• the tool elements are each C-shaped and individually attached to a table of the punching machine. With each downward movement of the head plate under the action of the drive device of the punching machine, all of the punching dies provided are simultaneously moved toward the material to be punched and the dies, so that they all perform a (punching) cut at the same time.
• the punching machine works according to the principle of the follow-up cut, in which the material to be punched is moved through the punching machine intermittently between the punching strokes, a series of identical punchings or identical punching patterns being punched one after the other and a specific workpiece to be punched several identical punchings or punching patterns one after the other having.
• the object of the invention is to create a punching machine which is as universal as possible and which, in particular, should also be able to punch quickly and with high precision workpieces which have an overall punching pattern which cannot be subdivided into identical individual punching patterns.
• the punching machine is characterized in that the guide of the punch is given by a respective guide sleeve which is interchangeably inserted in a guide plate arranged at a distance above the die and in which the punch is slidable is guided, and that the tool elements each have a coupling device that can be switched on and off that is used to selectively transmit the force to the assigned punch.
• the guide sleeves with punch stamp and the dies can be exchanged extremely easily or removed or inserted according to the respective punching task and one or more punch punches can be switched off from a provided punch punch arrangement with each punch stroke so that he or she does not perform any punching.
• the punching machine according to the invention can operate according to the follow-up cutting principle or the complete cutting principle.
• the individual cuts of the cut sequence can, if necessary, be carried out with punching dies switched on and off differently, which considerably expands the spectrum of parts which can be produced according to the follow-up cutting principle.
• the punching machine according to the invention also rationalizes punching according to the complete cutting principle, because with a single row of tool elements, each of which has a punch with an associated die, a larger number of different ones
• the punching machine according to the invention can be built much lighter and smaller than conventional punching machine in terms of the installed drive power, since these had to be designed for maximum occupancy, that is to say the use of the entire machine length in the direction of material movement for the use of punching stamps and the resulting forces and required power.
• the intermediate pieces of the coupling devices are preferably pneumatically, hydraulically, mechanically or electromagnetically displaceable.
• the tool element assembly and / or the coupling device assembly are preferably all interchangeable.
• a switchable coupling device is advantageously provided for each punch that can be switched on and off, although it is also possible to provide for punching dies to be switched on and off in groups. Conveniently, all punch stamps of the intended punch stamp arrangement can be switched on and off.
• the invention further relates to a tool set for installation in an existing press, which has a die arranged in a die holder and, at a distance above it, has a tool guide for a punch, the guide being a guide sleeve which can be exchanged in a guide plate is inserted and axially displaceable against spring action, and wherein the
• Punching stamp is axially displaceable in the guide sleeve against spring action.
• Such a tool set consisting of a punch and a die is known from DE-OS 25 38 605.
• the tool set according to the invention is characterized in that the tool set is assigned a coupling device which can be switched on and off and which serves for the optional transfer of the punching force to the punch, that a number of the guide sleeves, punch and dies are combined to form a structural unit are in which a lower part extending over its length forms the receptacles for the matrices and an upper part extending over its length and arranged at a distance above it forms the guide plate for the guide sleeves, and that a number of coupling devices are also separate is combined into a structural unit.
• a coupling device which can be switched on and off and which serves for the optional transfer of the punching force to the punch
• a number of the guide sleeves, punch and dies are combined to form a structural unit are in which a lower part extending over its length forms the receptacles for the matrices and an upper part extending over its length and arranged at a distance above it forms the guide plate for the guide sleeves, and that a number of coupling devices are also
• punching dies punching force or the like
• punching force this should not only refer to punching processes, that is to say cutting processes, in the narrower sense.
• These terms are rather well 115 ⁇ cash transactions, such as embossing, beading, with partial Schnei ⁇ the associated bending of material areas and the like., And take '.
• the punching machine according to the invention is preferably electronically controlled, in particular CNC-controlled (computerized numerical control). This control can take over the switching on and off of the individual punches or the drive of the individual punches and, if necessary, the feed device.
• the control is advantageously carried out by means of an integrated, program-controlled computer, to which the data for the workpiece to be produced are fed.
• the reaching of the top and bottom dead center of the punch stroke can be detected by sensors, the respective punch stamps being switched on after top dead center and being switched off after bottom dead center.
• a check can be carried out, for example, by means of a sensor as to whether punching waste comes from all of the punching dies that are switched on, the punching machine automatically switching off in the event of faults which do not produce any punching waste.
• the punching machine according to the invention can be fully automated and, as a result, can also be operated without operating personnel, for example at night.
• the control can be programmed, for example, via a keypad, via punched tape or via an information carrier cassette.
• FIG. 1 is a view of the punching stamp area of a punching machine, the viewing direction being transverse to the longitudinal direction of the punching machine;
• FIG. 2 shows a vertical section on a larger scale through a tool element of the punching machine according to FIG. 1;
• FIG. 3 shows a longitudinal section on an enlarged scale of a part of the tool element from FIG. 2, as well as top views of a die holder and a die cutting insert;
• FIG 5 shows a modified embodiment of the punching machine according to the invention with a turret plate.
• the head plate 2 can be moved along guide columns 6 onto the machine table 38 by means of a drive device (not shown), for example in the form of a hydraulic punch stroke drive.
• a drive device for example in the form of a hydraulic punch stroke drive.
• the head plate 2, which in the exemplary embodiment shown has the shape of a bar extending in the longitudinal direction of the punching machine, extends above the row of tool elements 42. To carry out the punching movement, the head plate is moved downward and acts on one, several or all Tool elements 42 with punching force.
• the tool element 42 shown consists essentially of a die holder 24 arranged on the lower part 44 with a die designed as an inserted cutting insert 26, a punching die unit 48 inserted into the top part 46 from above, which can be displaced downward towards the die against the action of springs 50, and a coupling device attached to the bottom of the head plate 2.
• the coupling device essentially consists of a vertical blind bore 54 which is open at the bottom and has a plunger 56 which is arranged to be vertically displaceable therein is displaceable to the left and back and is used to switch the plunger 56 on and off.
• Below the cutting insert 26, an opening 40 is provided in the lower part and in the machine table 38 for removing the punching waste.
• ⁇ RK remains on the top of the punching die unit 48. If the plunger 56 is switched on by moving the intermediate piece 34 to the left and the head plate 2 is lowered to carry out a punching movement, then the plunger 56 presses on the punching stamp unit 48 and presses it down against the action of the springs 50.
• the lower end face 52 of the punch unit 48 acts as a hold-down device.
• a Stanz ⁇ ' is arranged punch 18 vertically movable relative to, FIG. 3 shows a possible embodiment therefor. The punch 18 passes through the cutting insert 26 upon further downward movement of the head plate 2 and carries out the actual punching.
• the individual punching stamps 18 can be switched on and off as required by a CNC control. For example, For each punch stroke, an identical recess can be punched next to the other, while certain holes in the workpiece, for example, are only punched once after a certain number of recesses and a separating cutting punch only once at the end of the workpiece with the punched row of recesses is operated.
• the tool elements 42 or the stamping dies 18 do not have to be arranged in a straight line, but the stamping stamps 18 can also — viewed in the viewing direction of FIG. 1 — be arranged partly behind and partly in front of the drawing plane. It is also possible to provide a plurality of switchable punching dies 8 in one plane transverse to the longitudinal extent of the punching machine.
• a group of several dies 26, punching stamp units 48 and coupling devices can also be combined as a structural unit or tool set.
• the stamping unit 48 is inserted in the simplest way from above into a corresponding hole in the upper part 46.
• the tool elements 42 can be provided not only in one row in the longitudinal direction of the punching machine, but also in several rows one behind the other, as seen in the viewing direction of FIG. 1. A punching machine is therefore in front of one another Individual tool elements 42 or groups of tool elements 42 can be arranged at a selectable position on the punching machine, adapted to the respective punching task.
• the tool elements 42 are also ideal for retrofitting existing punching machines.
• a preferred embodiment for a stamping stamp unit 48 ' is shown in more detail.
• An upper tool head 58, a lower guide sleeve 60 and a spring element 62 arranged between them can be seen.
• a stamping punch holder 64 is arranged to pass through the interior space of these parts 58, 60, 62 and to which the actual punching stamp 18 of smaller diameter is attached below.
• the stamping stamp unit 48 is designed in a manner lubricated from the inside by an oil supply channel 66, the lubricating oil reaching down to the cutting stamp 18 and its passage through the lower end of the guide sleeve 60. If the plunger 56 (FIGS. 1 and 2) is pressed onto the respective tool head 58 while the head plate 2 is moving downward, the entire punching stamp unit 48 initially moves downward until its lower end face acts as a hold-down device on the to punching material. The further downward movement of the head plate 2 causes the respective spring element 62 to be compressed and thereby the actual punch 18 to emerge from the bottom of the punch unit 48 through the associated die 26.
• the die 26 shown in FIG. 3 is a cutting insert in a so-called one-way design, which is therefore not re-sharpened but rather replaced when it becomes blunt.
• the cutting punch receptacle 24 has, at the top, a circular recess 70, seen from above, but provided with a straightening 68.
• the cutting insert 26 provided with a corresponding circumferential contour is inserted into this from above and fastened with small screws.
• the cutting insert 26 contains the actual die cutting opening 28.
• the straightening 68 ensures that the cutting insert 26 is in a precise position.
• Fig. 4 shows a simple example of a so-called family of parts from the switch housing construction.
• families of parts also of a much more complicated type, can be created with one designed according to the invention
• FIG. 4a shows the simplest part of the family of parts, in which there are seven large punched recesses 72 arranged at an identical distance and a smaller punched recess 74 between them.
• two punch punches 18 will be provided in the longitudinal direction "adjacent to the punching machine, one for punching a larger recess 72 and the other for punching a smaller recess 74. Both punch punches are each moved around after the part 76 is advanced Feed length a is actuated at the same time, and only for cutting off the finished part 76 of the band-shaped punching raw material could a cutting punch be provided which is only switched on once after seven punching strokes.
• the part 78 according to FIG. 4b) differs from the part 76 in that it has a shorter length and in that an elongated recess shape 74 * has to be punched in part of the smaller recesses 74.
• an additional punching die can be provided which punches the extensions of the recesses 74 '.
• This additional punch is to be controlled so that it does not in any Stanzbe ⁇ the punching machine performs motion, but only where this is dictated by the program control of the punching machine. The 'stamping Otherwise this additional punch remains switched off.
• the separating cutting punch is to be controlled in such a way that a part 78 with five recesses 72 is cut off.
• the part 80 according to FIG. 4c) differs from the parts 76 and 78 in that the larger recesses 72 have a smaller mutual center distance a, that the smaller recesses 74 '* are smaller than before, that 72 holes 82 are to be punched in some of the sheet-metal tabs between the recesses and that a special recess 84 is to be stamped with a different shape at the beginning of part 80 .
• the recesses 72 and 74 * ' one will proceed here analogously to part 76.
• a separate punch is provided for the holes 82 and the separate recess 84, analogously to that described in connection with FIG. 4b) for the extension of the smaller recesses 74 '.
• the additional punches are controlled to be switched on when a hole 82 or a recess 84 is to be punched.
• FIG. 5 shows a plan view of a turret plate 90 which can be used in the punching machine according to the invention.
• the turret plate 90 has an essentially octagonal shape with rounded corners and can be rotated about its vertical axis of rotation 92 in steps of 90 ° or 45 °.
• a total of 14 through bores 94 are distributed over the circumference of the turret 90 such that, at least in part of the stepping positions of the turret 90, a plurality of bores 94 are arranged along a straight line 96 in the longitudinal direction of the punching machine.
• At a distance below the turret plate 90 is another, similar turret plate, not visible in FIG. 5. These two turret heads can be switched together in steps.
• the lower turret plate rests on the machine table 38, but can rotate on it in a rotationally sliding manner when it is indexed.
• the bores 94 serve for the insertion of punching stamp units 48 in the same manner as shown in FIG. 2.
• die receptacles 24 and dies 26 are arranged in the same way in the same way as shown in FIG. 2.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
• Shearing Machines (AREA)
• Punching Or Piercing (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=6213184

Family Applications (1)

Country Status (4)

Cited By (3)

Families Citing this family (12)

Citations (8)

Family Cites Families (8)

• 1983
  • 1983-10-31 DE DE3339503A patent/DE3339503C2/de not_active Expired
• 1984
  • 1984-10-30 DE DE8484113082T patent/DE3477998D1/de not_active Expired
  • 1984-10-30 AT AT84113082T patent/ATE42699T1/de not_active IP Right Cessation
  • 1984-10-30 EP EP84113082A patent/EP0140373B1/de not_active Expired
  • 1984-10-30 WO PCT/DE1984/000229 patent/WO1985001896A1/de unknown

Patent Citations (8)

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