WO1999067038A1 - Poinçon de decoupage pourvu d'un affutage a biseaux - Google Patents

Poinçon de decoupage pourvu d'un affutage a biseaux Download PDF

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Publication number
WO1999067038A1
WO1999067038A1 PCT/EP1999/004335 EP9904335W WO9967038A1 WO 1999067038 A1 WO1999067038 A1 WO 1999067038A1 EP 9904335 W EP9904335 W EP 9904335W WO 9967038 A1 WO9967038 A1 WO 9967038A1
Authority
WO
WIPO (PCT)
Prior art keywords
punch
stamping
gas pressure
guide
stamping punch
Prior art date
Application number
PCT/EP1999/004335
Other languages
German (de)
English (en)
Inventor
Albrecht Schneider
Original Assignee
Mate Precision Tooling Inc.
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
Application filed by Mate Precision Tooling Inc. filed Critical Mate Precision Tooling Inc.
Priority to AU63103/99A priority Critical patent/AU6310399A/en
Publication of WO1999067038A1 publication Critical patent/WO1999067038A1/fr

Links

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

Definitions

  • the invention relates to a punch unit with a punch, a punch driver, a guide bush and elastic means which are arranged between the guide bush and the punch driver and preload the latter in the direction of its initial position.
  • Such punching stamp units are known in various structural designs (see, for example, DE 195 05 754) and are produced in various sizes that can be used in the standardized receptacles of the tool holders of punching presses.
  • punching is the high level of noise.
  • punches with a beveled cutting edge are used in special punch units. With this type of cut, the punch is initially only punctiform or linear and penetrates the material to be machined at one point, which makes the punching process much quieter than if the punch touches down with a circumferential cutting edge and the material breaks out at the same time .
  • the use of punch with bevel cut which should be at least 3 mm of the punch length, is often not possible because the bevel requires a correspondingly longer stroke of the punch and many punch units, such as. B. the punching unit described in DE 195 05 754, do not have the necessary travel reserves.
  • the stamping unit according to the cited patent Writing in practice about a spring travel of 12 mm, ie if you punch a sheet of 8 mm thickness and assume an additional stroke of 1 mm in the die, there is a reserve of 3 mm, which has a bevel cut of at least 3 mm in height no longer allows. Lower heights of the bevel cut lead to unsatisfactory results.
  • one does not want to exhaust the possible spring travel in the case of disc springs since this considerably reduces the life of the disc spring assemblies. A change of the disc springs themselves is not possible due to the specified dimensions and the specified, desired restoring force.
  • the object of the invention is to provide a stamping unit which fits into the usual receptacles of tool holders and yet permits low-noise stamping processes.
  • the object is achieved by a punch unit of the type described in the introduction, in which the punch is guided in a guide bore in a scraper plate which is fixed in a radial fit on the guide bush, and the punch is provided with an oblique cut with a height of at least 3 mm is and as a elastic means is provided a ring-shaped gas pressure spring surrounding the punch driver.
  • the elastic means of the punch unit according to the invention are preferably formed by a gas pressure spring according to EP 0 708 267, which is suitable due to its dimensions and characteristics as a replacement for the usual steel springs, so that the structural changes to the punch unit can be small.
  • gas pressure springs are that in the relevant ten application compared to conventional spring elements have larger spring travel reserves and enable comparable restoring forces.
  • the increased spring travel allows a larger punch stroke and thus the use of punch stamps with angled grinding for noise reduction even with punch stamp units of the usual type.
  • the bevel cut of the punch makes it necessary to guide it in the area of the stripper plate in order to be able to absorb the tilting moments caused by the bevel on the punch with little leverage. In order to achieve exact guidance of the punch, the stripper plate is radially fitted on the guide bush.
  • the advantage of the stamping unit according to the invention is also that the stamp driver with its arrangement in the Fuhrungsbuch.se can be adopted constructively from known embodiments, so that no new construction, for example of the adjustment mechanism, is required to adjust the length of the stamping stamp.
  • the interchangeability of parts is advantageous in terms of rational production.
  • the internal pressure of the gas pressure spring can be varied.
  • the punch unit can thus be adapted to the hardness and the thickness of the material to be processed by lowering the internal pressure for softer or thinner materials.
  • the reduced internal pressure of the gas pressure spring also ensures less stress on the material surfaces, so that workpieces with surfaces that have already been machined can also be punched. If the internal pressure of the gas pressure spring is chosen to be correspondingly low, these surfaces remain intact.
  • the gas pressure spring is expediently provided with a connection for connection to a pressure supply.
  • the changeover time of the punch press when changing over to another material to be processed can be reduced to a minimum.
  • a plurality of punching stamp units according to the invention are connected to a common pressure supply line which can be connected to a compressed gas source. This makes it possible to jointly adjust all the punching stamp units arranged in a tool holder to the material to be machined.
  • Control valves between the compressed gas source and the supply line and / or between the supply line and one or more gas pressure springs can be used to set individual pressure values in the pressure chambers.
  • the figure shows the cross section of a stamping unit 10, which is seated in a receptacle 12 of a tool holder 14.
  • the stamping unit 10 has a stamp 16, which is guided axially displaceably in a guide bushing 18 receiving it.
  • the rear or upper end of the punch 16 is connected by an axial fastening screw 20 to the lower part 22 of a two-part punch driver in the example shown.
  • the punch driver lower part 22 is held together with the punch 16 by a guide wedge 24 mounted between the two, which engages with its radially outer end in an axial longitudinal groove 26 in the guide bushing 18.
  • the punching forces are transmitted via the surfaces of the punch 16 and the punch driver lower part 22 braced together by the screw 20.
  • the lower part 22 of the punch driver contains a threaded bore 28, into which the shaft of a upper part 30 of the punch driver 30, which is provided with an external thread, can be screwed.
  • the latter is formed at its rear end with a radially projecting head 32.
  • the punch driver lower part 22 is axially displaceably guided in a sliding bush 34, which in turn is guided in the rear region of the guide bush 18.
  • a flange-like extension formed at the front end of the sliding bush 34 comes to bear against the rear or upper end wall of the guide bush 18 when the sliding bush 34 is pulled back, thereby limiting the displacement path of the sliding bush 30 to the rear.
  • the sliding bush 34 is held in a rotationally fixed manner by means of an anti-rotation lock, not shown, relative to the guide bush 18, the punch 16 and the punch driver lower part 22.
  • the Gleitbuch.se 34 is provided at the rear or upper end with an internal thread into which a collar-shaped part of an annular spring bearing 36 formed with an external thread can be screwed. It is radially behind outside over the outer circumference of the sliding bush 34 and forms a support for a gas pressure spring 38. The compression spring 38 is clamped between the rear end wall of the guide bush 18 and the spring bearing 36.
  • the gas pressure spring 38 essentially consists of an annular housing 40 with a circumferential channel 42 which can be connected to a pressure reservoir (not shown) via a connection 44 and a control valve.
  • the housing 40 has a number of axially aligned bores 46 distributed over the circumference, which are connected to the circumferential channel 42 and in each of which an axially movable piston 48 is accommodated, which is sealed against the walls of the bores 46 by means of sealing rings 50 are sealed.
  • the preload of the gas pressure spring 38 can be varied via the level of the internal pressure, which can be controlled via the pressure reservoir. If there is a large gas volume between the connection 44 and the control valve (not shown), a flat spring characteristic results, while a smaller rising spring characteristic results.
  • the preload can also be varied by rotating the spring bearing 36 relative to the sliding bush 34.
  • a snap ring 52 e.g. B. a snap ring, which sits in an annular groove in the U fangs- surface of the punch driver upper part 30 prevents that this can be unscrewed or pulled out of the sliding bush 34 to the rear.
  • a radially inwardly operable against the force of a compression spring 54 In the rest position, pushbutton 56 locks the punch driver upper part 30 in the direction of rotation relative to the sliding bush 34 and the spring bearing 36.
  • the punch 16 is guided in a stripper plate 58, which in turn is radially fitted on the guide bush 18.
  • the guidance of the punch 16 in the vicinity of the cutting edge, which is provided with a bevel cut, is more suitable for absorbing tilting moments than the direct guidance of the punch 16 in the guide bushing 18 at a point further away from the cutting edge.
  • the length of the guide in the stripper plate 58 is 6 mm, the guide gap has a width of 3/100 mm.
  • the essential design features can also be used in other constructions by replacing the existing spring elements with a gas pressure spring in accordance with the gas pressure spring 38 described above, stamping the punch 16 with a bevel cut and guiding the stamping stamp directly in the Scraper plate 58 takes place.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Forests & Forestry (AREA)
  • Presses And Accessory Devices Thereof (AREA)
  • Polishing Bodies And Polishing Tools (AREA)

Abstract

L'unité à poinçon proposée comprend un poinçon (16) et un moyen élastique (38) placé entre le poussoir de poinçon (30) et une douille de guidage (18). Pour réduire le niveau de bruit lors du découpage à la presse, les poinçons étaient déjà pourvus d'un affûtage à biseaux. Cependant, la longue course nécessaire n'est, dans des unités à poinçon connues, souvent pas réalisée. Pour cette raison, il est proposé que le poinçon soit guidé dans une plaque dévétisseur (58) ajustée radialement à la douille de guidage (18), que le poinçon (16) soit pourvu d'un affûtage à biseaux et que le moyen élastique utilisé soit un ressort à pression de gaz (38). Une telle unité à poinçon permet des processus de découpage à faible bruit et est adaptée aux logements habituels de porte-outils.
PCT/EP1999/004335 1998-06-23 1999-06-23 Poinçon de decoupage pourvu d'un affutage a biseaux WO1999067038A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU63103/99A AU6310399A (en) 1998-06-23 1999-06-23 Stamping punch with an inclined ground section

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE29811198U DE29811198U1 (de) 1998-06-23 1998-06-23 Stanzstempel mit Schrägschliff
DE29811198.5 1998-06-23

Publications (1)

Publication Number Publication Date
WO1999067038A1 true WO1999067038A1 (fr) 1999-12-29

Family

ID=8058908

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1999/004335 WO1999067038A1 (fr) 1998-06-23 1999-06-23 Poinçon de decoupage pourvu d'un affutage a biseaux

Country Status (3)

Country Link
AU (1) AU6310399A (fr)
DE (1) DE29811198U1 (fr)
WO (1) WO1999067038A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202009007020U1 (de) 2008-07-04 2009-09-24 Bordignon, Silvano, Rosa' Verbesserte Abstreifeinrichtung zur Verwendung in Verbindung mit Stempelwerkzeugen

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107379109A (zh) * 2017-07-28 2017-11-24 山东交通学院 一种手动式会计凭证打孔机

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4292869A (en) * 1980-04-18 1981-10-06 Wallis Bernard J Unitary punch and die assembly
EP0622135A1 (fr) * 1993-03-31 1994-11-02 Amada Metrecs Company, Limited Outil de poinçonnage
JPH06328160A (ja) * 1993-05-21 1994-11-29 Amada Metrecs Co Ltd パンチング金型
DE19505754C1 (de) * 1995-02-20 1996-05-02 Mate Punch And Die Gmbh Stanzstempeleinheit

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4292869A (en) * 1980-04-18 1981-10-06 Wallis Bernard J Unitary punch and die assembly
EP0622135A1 (fr) * 1993-03-31 1994-11-02 Amada Metrecs Company, Limited Outil de poinçonnage
JPH06328160A (ja) * 1993-05-21 1994-11-29 Amada Metrecs Co Ltd パンチング金型
DE19505754C1 (de) * 1995-02-20 1996-05-02 Mate Punch And Die Gmbh Stanzstempeleinheit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202009007020U1 (de) 2008-07-04 2009-09-24 Bordignon, Silvano, Rosa' Verbesserte Abstreifeinrichtung zur Verwendung in Verbindung mit Stempelwerkzeugen

Also Published As

Publication number Publication date
AU6310399A (en) 2000-01-10
DE29811198U1 (de) 1998-11-26

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