EP0694351B1 - Stanzeinheit - Google Patents

Stanzeinheit Download PDF

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Publication number
EP0694351B1
EP0694351B1 EP19950111743 EP95111743A EP0694351B1 EP 0694351 B1 EP0694351 B1 EP 0694351B1 EP 19950111743 EP19950111743 EP 19950111743 EP 95111743 A EP95111743 A EP 95111743A EP 0694351 B1 EP0694351 B1 EP 0694351B1
Authority
EP
European Patent Office
Prior art keywords
punch
guide bushing
driver
unit according
punch driver
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP19950111743
Other languages
English (en)
French (fr)
Other versions
EP0694351A1 (de
Inventor
Gerd Simon
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mate Precision Technologies Inc
Original Assignee
Mate Punch and Die Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from DE4428116A external-priority patent/DE4428116C2/de
Application filed by Mate Punch and Die Co filed Critical Mate Punch and Die Co
Publication of EP0694351A1 publication Critical patent/EP0694351A1/de
Application granted granted Critical
Publication of EP0694351B1 publication Critical patent/EP0694351B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26F—PERFORATING; PUNCHING; CUTTING-OUT; STAMPING-OUT; SEVERING BY MEANS OTHER THAN CUTTING
    • B26F1/00—Perforating; Punching; Cutting-out; Stamping-out; Apparatus therefor
    • B26F1/02—Perforating by punching, e.g. with relatively-reciprocating punch and bed
    • B26F1/14—Punching tools; Punching dies
    • 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
    • B21D28/34—Perforating tools; Die holders
    • 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
    • B21D45/00—Ejecting or stripping-off devices arranged in machines or tools dealt with in this subclass
    • B21D45/003—Ejecting or stripping-off devices arranged in machines or tools dealt with in this subclass in punching machines or punching tools

Definitions

  • the invention relates to a punch unit according to the preamble of claim 1.
  • a punch unit of this type is known from U.S.-A-5,131,303.
  • the back end of the punch which is provided with an exterior thread, is screwed into a threaded bore at the front end of the punch driver.
  • the threaded section at the back end of the punch is provided with four axial, longitudinal grooves, and an open spring washer, whose one end is radially bent inward and projects through a radial hole into one of the axial grooves of the punch.
  • the spring washer is seated on the exterior circumference of the front end of the punch driver.
  • the guide bushing is frictionally connected via an O-ring with a washer seated on the punch driver underneath the compression spring and prevents the spring washer from being able to yield radially outward. In this way the punch and the punch driver are directly connected with each other by the spring washer without being able to rotate.
  • the punch driver When the punch is to be reground, the punch driver can be pulled away from the guide bushing toward the rear, in the course of which the frictional connection at the O-ring is released. After the spring washer has left the guide bushing, the threaded connection between the punch and the punch driver can be released by relative rotation. Because the radially inward bent end of the open spring washer has a point and the lateral walls of the grooves are inclined, the free end of the spring washer is pushed out of the groove in which it had been engaged when the punch is rotated in relation to the punch driver and, with continued relative rotation, then engages the next groove. Since the thread pitch is known, it is also known which change in the total length of the punch and punch driver corresponds to the rotational angle between two grooves.
  • the known punch unit assures a simple setting of the total length of the punch and punch driver, it suffers from the essential disadvantage that the grooves intended for safeguarding against relative rotation weaken the thread through which the large punching forces are transmitted to the punch.
  • This is of particular disadvantage in connection with punches having a relatively small cross section, as finer adjustment is required with decreasing cross section, because it is then necessary to have correspondingly more grooves at the circumference.
  • the arrangement is preferably selected to be such that at least one radial protrusion is axially formed on the punch driver between the exterior back end of the punch and the compression spring which protrusion, in the assembled state, is in engagement with an axial groove, open at the back end, in the guide bushing.
  • the essential advantage is achieved by the invention in that axial grooves required for an adjustable safeguarding against relative rotation or other safeguard elements are disposed on or in a part which is unaffected by the punch forces, namely the guide bushing, whose weakening is of no consequence.
  • the further advantage is achieved that, with the same punch cross section, the grooves are located on a larger radius. It is, therefore, easily possible to dispose more grooves at the circumference, and their angular accuracy is greater.
  • the invention offers increased functional assurance.
  • the spring washer constituting the safeguard against relative rotation was not in its correct locking position, could have remained unnoticed. In that case the stress of the punch force resulted in the destruction of the tool.
  • the suggested punch unit it can be very clearly noticed whether the radial protrusion on the punch driver has entered one of the grooves in the guide bushing or whether the parts still are in their separated position required for a relative rotation.
  • the radial protrusion is arranged on a set collar which can be screwed onto a threaded section of the punch driver, can be fixed in place in a defined position and represents the spring bearing. This is necessary anyway and is also not a wear item. In this embodiment the punch itself does not require any additional processing.
  • the punch unit represented in Figs. 1 to 4 consists in a known manner of a punch 10 guided linearly displaceable in a guide bushing 12. A rotation of the punch 10 in relation to the guide bushing 12 is prevented by a pin 16, fixedly seated in a radial bore 14 in the punch 10, which protrudes radially and engages an interior longitudinal groove 18 in the guide bushing 12.
  • This axial groove 18 is also radially outwardly open over a portion of its length, so that a pin, not shown, or other securing member can engage the groove 18 from the outside and can maintain the guide groove 18 or bushing 12 non-rotatingly on the machine frame, not shown.
  • the disclosed punch unit corresponds to conventional designs.
  • the back or upper end of the punch 10 is screwed together with a punch driver 24.
  • the back end of the punch 10 is provided with a threaded bore 25 for this purpose, into which the front end 26, which is provided with an exterior thread, of the punch driver 24 is screwed.
  • the total length of the punch 10 and the punch driver 24 is set by screwing the front end of the punch driver 24 into the threaded bore 25 of the punch 10 more or less deeply.
  • a set collar 28, provided with a corresponding interior thread, is located above the punch 10 on the exterior thread of the front end 26 of the punch driver 24. Its cross section is of a slightly smaller size than the punch 10, because during the stroke of the punch it performs an axial relative movement in the guide bushing 12 together with the punch 10.
  • An intermediate ring 30 is supported on the set collar 28 and is seated, freely displaceable, on the shaft of the punch driver 24 which adjoins the front end 26 provided with the thread above or toward the rear.
  • the set collar 28 forms a stop for the movement of the intermediate ring 30 in the axially forward or downward direction of movement.
  • a compression spring 34 is clamped in a known manner, whose pre-load can be set or adjusted in that the set collar 28 is screwed to a greater or lesser extent on the exterior thread on the front end 26 of the punch driver 24 and is then fixed in place.
  • the position secure against relative rotation of the set collar 28 can be achieved, for example, by a securing screw (not shown) screwed into a radial threaded bore and engaging the exterior thread on the front end 26 of the punch driver 24.
  • This screw connection makes it possible to remove the punch 10 from the punch driver 24 for the purpose of regrinding.
  • the smaller punch work piece makes the regrinding process easier.
  • the threaded connection at the front end 26 of the punch driver 24 allows an increased length compensation of the shortening connected with the regrinding of the punch 10.
  • One or a plurality of longitudinal grooves 36 which are distributed over the circumference and are open toward the top or the back, in the back end of the guide bushing 12 and one or a plurality of radial protrusions 38 on the punch driver 24, which are to be brought into engagement with these grooves, are sufficient in the punch unit shown to achieve all these goals.
  • the axial grooves 36 for example two, four or six grooves cut evenly distributed over the circumference into the guide bushing in addition to the slightly wider longitudinal groove 18 and whose length does not need to be much greater than the maximum stroke of the punch, are located on a comparatively large radius and only weaken the guide bushing 12, which is not stressed by the punch force.
  • the radial protrusion 38 on the side of the punch driver 24 is preferably disposed on the set collar 28.
  • the protrusion can be formed, for example, by a set screw screwed into a radial threaded bore in the set collar 28 - for example, even by the screw by means of which the set collar 28 is maintained fixed against relative rotation on the punch driver 24 - or by a pin pressed into a radial bore which, the same as the set screw mentioned, protrudes radially in respect to the set collar 28 and can be brought into engagement with one of the longitudinal grooves 36.
  • the punch unit shown has the particular advantage that changes of the total length of the punch 10 and the punch driver 24 can be made very rapidly and simply. Starting with the position represented in Figs. 1 and 2, it is only necessary to lift the punch driver 24 together with the parts connected with it sufficiently far in relation to the guide bushing 12 maintained on the machine frame, so that the radial protrusion 38 has left the groove 36, open at the top, which receives it, in a direction toward the back or upward. This retracted position of the punch driver 24 is represented in Figs. 3 and 4.
  • the punch driver 24 is turned in one or the other direction, while the punch 10, together with the guide bushing 12, is maintained fixed against relative rotation by the engagement of the pin 16 with the groove 18, the engagement length by which the front end 26, provided with the exterior thread, of the punch driver 24 engages the threaded bore 25 in the back end of the punch 10 is changed. Since the pitch of this thread is known, the value by which the total length of the punch 10 and the punch driver 24 is changed, is also known if, together with the latter, the radial protrusion 38 is rotated by the pitch angle between two grooves 36. It is understood that with an increase in the number of grooves 36 distributed over the circumference the adjustment accuracy is increased. In the course of this, for example, there is also the option to embody the grooves 36 in the form of an interior toothing and the exterior circumference of the set collar 28 in the form of an exterior toothing which is to be brought into engagement with this interior toothing.
  • the intermediate ring 30 whose exterior diameter is greater than the set collar 28, is seated in a widened bore section at the rearmost end of the guide bushing 12.
  • the intermediate ring 30 has an O-ring 40 in an annular groove on its exterior circumference which, in the position shown in Figs. 1 and 2, is seated radially compressed in the widened bore section at the rearmost end of the guide bushing 12. A seal against the emergence toward the back of lubricant from the guide bushing 12 is provided in this way.
  • the O-ring 40 constitutes an easily releasable frictionally engaged connection between the guide bushing 12 and the punch driver 24. It can additionally be secured in that the widened bore section in the rearmost end of the guide bushing 12 is embodied with an interior annular groove which is engaged by the O-ring 40.
  • the radial protrusion 38 is disposed on the set collar 28 which, in turn, is seated on the punch driver 24 between the back end of the punch 10 and the spring 34. It is understood that it is possible to directly or indirectly dispose a radial protrusion 38, which is to be brought into engagement with one or a plurality of grooves 36 in the back end of the guide bushing 12, on the punch driver 24 even if, differently from the way shown in the drawings, the front end of the latter is provided with a threaded bore into which the back end of the punch 10, which is provided with an exterior thread, can be screwed.
  • the arrangement of the radial protrusion and the grooves can be reversed in that a radially inward extending protrusion is embodied or disposed at the back end of the guide bushing 12 which engages one of several axial grooves at the exterior circumference of the set collar 28.
  • the radial protrusion should suitably be disposed on a radius which is greater than the radius of the punch 10.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Forests & Forestry (AREA)
  • Punching Or Piercing (AREA)
  • Encapsulation Of And Coatings For Semiconductor Or Solid State Devices (AREA)
  • Measurement Of The Respiration, Hearing Ability, Form, And Blood Characteristics Of Living Organisms (AREA)
  • Polishing Bodies And Polishing Tools (AREA)

Claims (8)

  1. Stanzstempeleinheit mit einem Stempeltreiber (24), der mit dem hinteren Ende eines Stempels (10) durch eine Gewindeverbindung (25, 26) verbunden ist, lösbaren Sicherungselementen (36, 38), die eine Relativdrehung zwischen dem Stempel (10) und dem Stempeltreiber (24) während eines Hubes des Stempels (10) verhindern, und einer Druckfeder (34), die mit Vorspannung zwischen einem Kopf (32) am hinteren Ende des Stempeltreibers (24) und einem an diesem angeordneten Federlager (30) eingespannt ist und während eines Hubes des Stempels zwischen dem Kopf (32) und einer den Stempel (10) axial verschieblich aufnehmenden Führungsbuchse (12) komprimierbar ist, dadurch gekennzeichnet, daß die Führungsbuchse (12) den Stempel (10) in unverdrehbarer Weise aufnimmt und die Sicherungselemente (36, 38) einen formschlüssigen Eingriff in der Umfangsrichtung zwischen dem Stempeltreiber (24) und der Führungsbuchse (12) in wenigstens einer relativen Winkelstellung in einem Axialbereich zwischen der mit der Innenwandung der Führungsbuchse (12) in Kontakt befindlichen, äußeren rückwärtigen Kante des Stempels (10) und der Druckfeder (34) aufweisen.
  2. Stanzstempeleinheit nach Anspruch 1, dadurch gekennzeichnet, daß die Sicherungselemente (36, 38) wenigstens einen am Stempeltreiber (24) zwischen der Hinterkante des Stempels (10) und der Druckfeder (34) axial angeordneten Radialvorsprung (38) und wenigstens eine Axialnut (36) in der Führungsbuchse (12) aufweisen, wobei die Axialnut (36) am offenen Ende der Führungsbuchse (12) offen ist.
  3. Stanzstempeleinheit nach Anspruch 2, dadurch gekennzeichnet, daß das Federlager einen Stellkragen (28) aufweist, der durch eine Gewindeverbindung (26) an dem Stempeltreiber (24) anbringbar ist.
  4. Stanzstempeleinheit nach Anspruch 3, dadurch gekennzeichnet, daß der Radialvorsprung (38) einen Stift aufweist, der in eine Radialbohrung in dem Stellkragen (28) eingesetzt ist.
  5. Stanzstempeleinheit nach Anspruch 3, dadurch gekennzeichnet, daß auf dem Stempeltreiber (24) zwischen dem Stellkragen (28) und der Druckfeder (34) ein Zwischenring (30) sitzt, der axial an dem Stellkragen (28) und an der Führungsbuchse (12) abgestützt ist und auf seiner äußeren Umfangsfläche einen radial vorspringenden O-Ring (40) aufweist, der an der Innenwandung der Führungsbuchse (12) anliegt, wenn der Radialvorsprung (38) sich in der Axialnut (36) befindet, wobei der O-Ring (40) reibschlüssig an der Innenwandung liegt und axial von dieser lösbar ist.
  6. Stanzstempeleinheit nach Anspruch 2, dadurch gekennzeichnet, daß die Führungsbuchse (12) mehr als eine Axialnut (36) umfaßt und weniger Radialvorsprünge (38) als Axialnuten (36) vorgesehen sind.
  7. Stanzstempeleinheit nach Anspruch 2, dadurch gekennzeichnet, daß die Axialnuten (36) geringfügig länger als die Länge der Linearbewegung zwischen dem Stempel (10) und der Führungsbuchse (12) während eines Hubes des Stempels (10) sind.
  8. Stanzstempeleinheit nach Anspruch 2, dadurch gekennzeichnet, daß der Stempeltreiber (24) einen Absatz aufweist, wobei der Stempeltreiber (24) und der Absatz eine einstückige Konstruktion bilden und der Radialvorsprung (38) an dem Absatz angebracht ist.
EP19950111743 1994-07-27 1995-07-26 Stanzeinheit Expired - Lifetime EP0694351B1 (de)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE4426498 1994-07-27
DE4426498 1994-07-27
DE4428116 1994-08-09
DE4428116A DE4428116C2 (de) 1994-07-27 1994-08-09 Stanzstempeleinheit

Publications (2)

Publication Number Publication Date
EP0694351A1 EP0694351A1 (de) 1996-01-31
EP0694351B1 true EP0694351B1 (de) 2001-10-17

Family

ID=25938712

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19950111743 Expired - Lifetime EP0694351B1 (de) 1994-07-27 1995-07-26 Stanzeinheit

Country Status (4)

Country Link
EP (1) EP0694351B1 (de)
AU (1) AU3143995A (de)
CA (1) CA2154740A1 (de)
WO (1) WO1996003261A1 (de)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9723031D0 (en) 1997-11-01 1998-01-07 Petroline Wellsystems Ltd Downhole tubing location method
US7188687B2 (en) 1998-12-22 2007-03-13 Weatherford/Lamb, Inc. Downhole filter
GB0224807D0 (en) 2002-10-25 2002-12-04 Weatherford Lamb Downhole filter
CN108326221A (zh) * 2017-12-12 2018-07-27 万向钱潮传动轴有限公司 一种花键轴叉制坯模自动锁紧装置

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3935772A (en) * 1975-03-21 1976-02-03 Houdaille Industries, Inc. Punching device having selectable pinch point clearance
US4166403A (en) * 1977-08-10 1979-09-04 Houdaille Industries, Inc. Method of making a rigidly supported molded plastics material punch guide and stripper
US4440052A (en) * 1980-09-12 1984-04-03 Unipunch Products, Inc. Punch assembly with unitary stripper spring assembly
US5056392A (en) * 1988-08-19 1991-10-15 Mate Punch & Die Co. Punch assembly
US4989484A (en) * 1988-08-19 1991-02-05 Mate Punch & Die Company Punch and stripper assembly
US5131303A (en) 1991-08-12 1992-07-21 Wilson Tool International Punch assembly
JP2596673B2 (ja) * 1992-07-03 1997-04-02 株式会社アマダメトレックス パンチ金型装置
US5329835A (en) * 1992-10-07 1994-07-19 Wilson Tool International, Inc. Adjustable length punch set assembly
JP2636128B2 (ja) * 1993-02-03 1997-07-30 株式会社アマダメトレックス パンチング金型
JP2636127B2 (ja) * 1993-02-03 1997-07-30 株式会社アマダメトレックス パンチング金型

Also Published As

Publication number Publication date
AU3143995A (en) 1996-02-22
WO1996003261A1 (en) 1996-02-08
CA2154740A1 (en) 1996-01-28
EP0694351A1 (de) 1996-01-31

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