EP0800875A1 - Procédé pour plier et dispositif de compensation en hauteur d'un outil de poiçonnage en feuillard d'acier - Google Patents

Procédé pour plier et dispositif de compensation en hauteur d'un outil de poiçonnage en feuillard d'acier Download PDF

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Publication number
EP0800875A1
EP0800875A1 EP97103470A EP97103470A EP0800875A1 EP 0800875 A1 EP0800875 A1 EP 0800875A1 EP 97103470 A EP97103470 A EP 97103470A EP 97103470 A EP97103470 A EP 97103470A EP 0800875 A1 EP0800875 A1 EP 0800875A1
Authority
EP
European Patent Office
Prior art keywords
bending
line
punching
steel
strip
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.)
Withdrawn
Application number
EP97103470A
Other languages
German (de)
English (en)
Inventor
Rolf Sinn
Wolfgang Prof. Dr. Grebe
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.)
Karl Marbach GmbH and Co KG
Original Assignee
Karl Marbach GmbH and Co KG
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 Karl Marbach GmbH and Co KG filed Critical Karl Marbach GmbH and Co KG
Publication of EP0800875A1 publication Critical patent/EP0800875A1/fr
Withdrawn legal-status Critical Current

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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
    • B21D37/00—Tools as parts of machines covered by this subclass
    • B21D37/20—Making tools by operations not covered by a single other subclass
    • B21D37/205—Making cutting tools
    • 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
    • B21D7/00—Bending rods, profiles, or tubes

Definitions

  • the invention relates to a method for bending and a device for height compensation of a steel strip punching line with a cutting edge for a steel strip punching and creasing tool.
  • the band steel punching and creasing tools are used to produce irregularly shaped blanks from a wide variety of flat materials, such as cardboard, cardboard, corrugated cardboard or foils.
  • the band steel punching and creasing tools generally have an upper carrier plate, in which a plurality of strip steel punching lines and creasing lines extending downward are arranged, and a counter-stamping plate opposite the carrier plate, on which a sheet to be punched is placed.
  • the carrier plate with the band steel punching lines is moved in the direction of the counter-punching plate until the punching lines cut through the sheet and hit the counter-punching plate. It is of crucial importance that the strip steel punching lines cut the material to be cut fiber-free with each punching stroke over the entire punching area. This is an indispensable prerequisite for the problem-free breaking out of the individual blanks from the punched sheet.
  • the height differences can be caused by differences in the punching machine or result from height differences in the steel strip punching lines.
  • the problem of height differences is particularly great with curved steel strip punching lines.
  • the strip steel punching lines are brought into the desired shape using appropriate bending devices. With this plastic deformation, the cutting edge moves outwards from its central position and sinks. This lowering depends on the bending angle and the bending radius and the line thickness. In some cases the cutting edge loses up to 0.050 mm in the area of the bending axes. At this point, a complete cut of the sheet to be punched is no longer guaranteed.
  • the invention had for its object to provide a simple method and an apparatus with which curved steel strip lines can be produced with a constant height.
  • the process according to the invention prevents or eliminates the lowering which usually occurs in the case of a bend in the region of the bend axes, so that a curved band steel punching line can be produced with a constant height, which ensures that a sheet to be punched is completely cut through along its cutting edge.
  • the method can be used for all bending work on steel strip punching lines.
  • a device according to claim 5 can be used for height compensation in the method according to the invention.
  • FIG. 1 shows a development of the bent strip steel punching line 10.
  • the strip steel punching line 10 has a shaft 12 to which a symmetrical cutting edge 14 is connected.
  • a concave recess 18 is formed in the area of the tip 16 of the cutting edge 14, which has its deepest point 19 on the bending axis 11.
  • the height difference between the tip 16 of the cutting edge 14 in the area outside the bending area 13 and the deepest point 19 of the recess 18 has the amount "a".
  • a severing of a sheet to be punched by the cutting edge 14 is no longer guaranteed.
  • the elevation 20 lowers at its highest point 21 by the amount "a” and the cutting tip 16 has essentially the height in the bending area 13 the cutting tip 16 outside the bending region 13.
  • the height compensation by means of a pressure exerted in the bending area 13 can also be carried out during the bending or after the bending.
  • FIGS. 5 and 6 show a device by means of which a height compensation can be carried out on a strip steel punching line 10 which is already bent by 90 °.
  • the device 30 comprises a pressure ram 32 which can be moved in its longitudinal direction (arrow B) and at the front end of which a symmetrical pressure wedge 34 is formed which has a bending curve 36 at its tip.
  • the bending curve 36 is designed such that it can exert pressure in the area of the entire shaft 12 of a steel strip punching line 10 at the location of the bending axis 11 of the steel strip punching line 10.
  • a stationary counter matrix 38 is arranged opposite the bending curve 36.
  • the counter die 38 has on its end facing the bending curve 36 a projection 40 which is flat on its end face and the lower end of which is arranged below the transition between the shank 12 and the cutting edge 14 of a band steel punching line 10 to be deformed, which is between the pressure stamp 32 and the counter die 38 is arranged.
  • a recessed flat pressure surface 42 of the counter die 38 adjoins the lower end of the projection 40 and extends to the lower end of the shaft 12 of the band steel punching line 10.
  • the band steel punching line 10 For the height compensation of the band steel punching line 10 bent by 90 ° in the region of the bend, the band steel punching line 10 so inserted between the plunger 32 and the counter die 38 that the bending curve 36 bears at the location of the bending axis 11 of the steel strip punching line 10. Subsequently, the pressure stamp 32 is moved in the direction of the counter die 38, the band steel punching line 10 initially striking the projection 40 in its bending area, which, when the pressure stamp 32 moves further, exerts a compressive force on the band steel punching line 10 in the transition region between the shaft 12 and the cutting edge 14. The pressure stamp 32 is moved in the direction of the counter die 38 until the shaft 12 abuts the bend with its side facing the counter die 38 against the pressure surface 42. Due to the pressure exerted by the projection 40 on the transition region between the shaft 12 and the cutting edge 14, the cutting edge 14 is raised in the bending region to the height of the tip 16 outside the bending region.
  • the device shown in FIGS. 5 and 6 can also be used to raise the cutting tip 16 of a strip steel punching line 10 which has not yet been bent.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
EP97103470A 1996-04-09 1997-03-03 Procédé pour plier et dispositif de compensation en hauteur d'un outil de poiçonnage en feuillard d'acier Withdrawn EP0800875A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE1996113984 DE19613984A1 (de) 1996-04-09 1996-04-09 Verfahren zum Biegen und Vorrichtung zum Höhenausgleich einer Bandstahlstanzlinie mit einer stanzseitigen Schneide für ein Bandstahl-Stanz- und Rillwerkzeug
DE19613984 1996-04-09

Publications (1)

Publication Number Publication Date
EP0800875A1 true EP0800875A1 (fr) 1997-10-15

Family

ID=7790782

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97103470A Withdrawn EP0800875A1 (fr) 1996-04-09 1997-03-03 Procédé pour plier et dispositif de compensation en hauteur d'un outil de poiçonnage en feuillard d'acier

Country Status (2)

Country Link
EP (1) EP0800875A1 (fr)
DE (1) DE19613984A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9610697B2 (en) 2010-01-26 2017-04-04 Boehler-Uddeholm Precision Strip Gmbh Punching tool

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3135980C1 (de) * 1981-09-11 1983-06-01 Karl Marbach Gmbh & Co, 7100 Heilbronn Bandstahlstanzwerkzeug mit mindestens einem eine Schneide aufweisenden bandförmigen Stanzmesser
DE3317777C1 (de) * 1983-05-16 1984-09-13 R + S Stanzformen GmbH, 6000 Frankfurt Bandstahlstanzwerkzeug fuer Zuschnitte aus Karton od.dgl.
US4637282A (en) * 1984-04-13 1987-01-20 Frank Gray Method of making clear dies from bar stock
DE3928916C1 (fr) * 1989-08-31 1991-01-24 Karl Marbach Gmbh & Co, 7100 Heilbronn, De

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3135980C1 (de) * 1981-09-11 1983-06-01 Karl Marbach Gmbh & Co, 7100 Heilbronn Bandstahlstanzwerkzeug mit mindestens einem eine Schneide aufweisenden bandförmigen Stanzmesser
DE3317777C1 (de) * 1983-05-16 1984-09-13 R + S Stanzformen GmbH, 6000 Frankfurt Bandstahlstanzwerkzeug fuer Zuschnitte aus Karton od.dgl.
US4637282A (en) * 1984-04-13 1987-01-20 Frank Gray Method of making clear dies from bar stock
DE3928916C1 (fr) * 1989-08-31 1991-01-24 Karl Marbach Gmbh & Co, 7100 Heilbronn, De

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9610697B2 (en) 2010-01-26 2017-04-04 Boehler-Uddeholm Precision Strip Gmbh Punching tool

Also Published As

Publication number Publication date
DE19613984A1 (de) 1997-10-16

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