EP3589444A1 - Method for producing a stamped metal sheet - Google Patents
Method for producing a stamped metal sheetInfo
- Publication number
- EP3589444A1 EP3589444A1 EP18710778.4A EP18710778A EP3589444A1 EP 3589444 A1 EP3589444 A1 EP 3589444A1 EP 18710778 A EP18710778 A EP 18710778A EP 3589444 A1 EP3589444 A1 EP 3589444A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- interruption
- laser beam
- cutting line
- base plate
- punching
- 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- Withdrawn
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/36—Removing material
- B23K26/38—Removing material by boring or cutting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/14—Working by laser beam, e.g. welding, cutting or boring using a fluid stream, e.g. a jet of gas, in conjunction with the laser beam; Nozzles therefor
- B23K26/142—Working by laser beam, e.g. welding, cutting or boring using a fluid stream, e.g. a jet of gas, in conjunction with the laser beam; Nozzles therefor for the removal of by-products
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B26—HAND CUTTING TOOLS; CUTTING; SEVERING
- B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
- B26D3/00—Cutting work characterised by the nature of the cut made; Apparatus therefor
- B26D3/08—Making a superficial cut in the surface of the work without removal of material, e.g. scoring, incising
- B26D3/085—On sheet material
-
- 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
- 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
- B26F1/18—Perforating by slitting, i.e. forming cuts closed at their ends without removal of material
-
- 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
- B26F1/18—Perforating by slitting, i.e. forming cuts closed at their ends without removal of material
- B26F1/20—Perforating by slitting, i.e. forming cuts closed at their ends without removal of material with tools carried by a rotating drum or similar support
-
- 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
- B26F1/38—Cutting-out; Stamping-out
- B26F1/44—Cutters therefor; Dies therefor
-
- 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
- B26F1/38—Cutting-out; Stamping-out
- B26F1/44—Cutters therefor; Dies therefor
- B26F2001/4463—Methods and devices for rule setting, fixation, preparing cutting dies
-
- 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
- B26F1/38—Cutting-out; Stamping-out
- B26F1/44—Cutters therefor; Dies therefor
- B26F2001/4472—Cutting edge section features
Definitions
- the present invention relates to a method of manufacturing a punching sheet having at least one cutting line interrupted to form perforations or breakpoints, i. a cutting line with interruptions, which is arranged on a base plate. Furthermore, the invention relates to a stamped sheet, which has at least one interrupted to produce perforations or breakpoints cutting line.
- Printers produce printed products that have perforations and breakpoints in different shapes.
- Examples of printed products are self-adhesive labels, tickets or hang tags as rolls, which are to be torn off in use from the roll, during tearing the labels are often torn off including the carrier layer or in the case of monomaterials as a whole.
- the perforation which is generated via interruptions in the punching or cutting line of the punching plate, can be used for tearing or for folding and kinking.
- simple breakpoints can also be generated by means of cutting lines.
- the number of gaps is considerably smaller than in the case of a perforation.
- a cutting line can also be spoken of a punching line.
- a partial punching or perforation, which causes a weakening of the roll material is generated as described with a stamped sheet whose cutting lines have interruptions. In the area of interruptions, the roll material is not punched. If labels are to be torn off with carrier material, the perforation is designed so that the carrier material is also severed with.
- this perforation is usually designed in the same height or depth, as the cutting contour of the label. The carrier web is then only punched at best.
- the cuts and lands are uniform and of identical length.
- the concomitant uniform training of cutting line sections and interruptions of the cutting line can vary in particular when trained to breakpoints.
- Essential for the formation of perforations and breakpoints is the expression of the cutting line interruption and the contour or shape of the mutually facing end faces of the cutting line.
- the steel of the stamping sheet is removed by the etching medium and reduced in thickness.
- the adjacent end faces of the cutting line pieces are also attacked by the etching medium.
- the gaps become larger and the cuts are shorter in length.
- the aggressiveness of the etching medium and the etching rate to be achieved are relatively complex factors to be controlled, which lead to irregular results.
- Another problem is the high stress of the engraving tool. Not infrequently, the tool breaks off during the engraving process in which preprogrammed paths are traveled, or it is subject to heavy wear. This is both not determined in the worst case by the manufacturer and the result in the result to different and in particular not deep enough trained interruptions of the punching sheet that damage the material to be punched up to bursting. The interruptions can thus not be executed accurately in both depth and width / length. Similar problems due to irregular wear of the tool also result in the grinding process, in which a tool disk rotates about an axis extending parallel to the planar extent of the base plate. Especially with narrow interruptions wear the discs quickly, which is often not noticed.
- a laser beam is used to generate the at least one interruption of the cutting line.
- electromagnetic waves are understood to have a sharply focused beam and a large coherence length in a preferably narrow frequency range.
- it is monochromatic light and / or beam pulses of a specific and material-dependent adjustable repetition frequency.
- the interruption is completely generated by the laser beam, i.e., it is initially applied by etching or e.g. Engraving generated preliminary work of interruptions omitted, so that although the amount of energy to be applied by a laser beam must be increased, however, the process uncertainty associated with the conventional processing methods is avoided.
- the cutting line is thus initially completely uninterrupted and thus formed continuously and interrupted only after their preparation.
- the introduction of the laser beam is a separately integrated into the process flow for the production of a punching sheet processing step, which can be made after the production of the cutting line.
- the punching sheet processing step which can be made after the production of the cutting line.
- Energy, residence time and focusing of the laser beam are preferably even chosen so that when the interruption is generated, a recess is formed into the base plate.
- the weakening of the base sheet and any resulting stability are therefore deliberately accepted in order to ensure greater process reliability.
- the base plate is completely severed by the laser beam in the formation of the interruption. Although this maximally weakens the stamped sheet, a process control through the resulting gap in the recess is much easier.
- the introduction of the energy in the form of laser light produces a molten bath, in particular the energy of the laser beam and possibly also the pressure and a flow rate of a protective gas are preferably to be selected such that the material is cut away or blown. The surrounding areas of the interruption in the base plate or in the punching line are thereby little affected or damaged.
- the depth of the recess is maximized by its passage through the base plate, so that there is no impairment of the material to be punched in the punching process to produce the perforation or breakpoints.
- the laser beam energy which is introduced in the region of the recess to be made on the stamped sheet, the pressure and / or the flow rate of the protective gas is such that the sheet metal material detected by the laser beam is removed without residue.
- a protective gas atmosphere a 99.999% nitrogen atmosphere is preferably formed.
- a protective gas nozzle used in this case fades with its protective gas jet at a pressure of preferential example, at least 6 bar, in particular between 7 and 10 bar, the material detected by the laser beam, so that this is removed without residue from the blanking plate.
- the laser beam is traversed perpendicular to the uppermost cutting edge of the cutting line to produce the interruption, i.e. the cut made by the laser beam is perpendicular to the longitudinal direction of the cutting line along the surface of the base sheet.
- a laser beam having a focal point having a diameter of 0.12 mm is used to make the interruption.
- an interruption becomes particularly economical when, for interruptions of a length of more than 0.25 mm, stamped sheet metal sections are cut out by bypassing the laser beam.
- a circle segment section is driven with the laser beam and the bypassed material is cut out.
- the laser beam can already be detected in the region of the basic zone which adjoins the not yet interrupted cutting line. sheet metal process.
- exactly the outgoing region of the cutting line contour is run over, so that the structure of the base plate outside the cutting lines is not unnecessarily weakened.
- the end face of the cutting line directed towards the interruption and / or a base plate area adjoining the interruption on the lower side and / or the upper side are produced without burrs and / or without burrs.
- a stamped sheet which has at least one cutting line interrupted to produce perforations or holding points, wherein the stamped sheet has an interruption generated by lasers between mutually facing end faces of the cutting line.
- a stamped sheet is produced by the above or below described inventive method.
- such a stamped sheet also has the advantages described above or described below.
- the interruption is continuous, ie the interruption is adjacent to a recess in the base plate, wherein the recess completely traverses the base plate.
- the interruption passes into the recess of the base plate.
- the cutting line interruption is sufficient in depth.
- the material to be punched is pressed into the resulting interruption or recess even during the compression of the material during punching and remains undamaged.
- the edges of the recess towards the base plate through a provided with less energy input laser beam slightly rounded in order to avoid influences on the material to be processed as far as possible.
- FIG. 5 is a plan view of a part of a punching plate according to the invention.
- Fig. 6 is a perspective view of a portion of another punching sheet according to the invention.
- Fig. 1 the result of a punching or punching a multi-layer material 1 is generally shown. Both in the section 5 produced by means of punching as well as in the section 6 produced by punching, the upper material 2 is severed in the region of the cutting line of the punching plate. Also, the adhesive layer 3 is severed in both variants. By contrast, the carrier material 4 is only separated during punching (cut 6).
- a cross section is represented by a perforation line with material sections 7 of roughly equal length, which are regularly interrupted by punched-through regions 8.
- the breaks in the cutting line necessary for sections 7 are made deep enough, the prior art material to be machined is squeezed in the area of the break in accordance with the prior art. This can lead, in particular in combination with already worn punching lines, to the fact that complete separation of the material no longer takes place and material webs 9 remain which impair the tearing off of a label along the perforation line.
- Perforation lines 10 are used, for example, to strip label strips with, for example, as in the exemplary embodiment according to FIG. 3, three labels 1 1 in groups of a roll product.
- the holding points 12 shown in FIG. 4 can also be formed as interruptions of the punched lines 13.
- the holding points 12 are produced as material sections by interruptions of a cutting or punching line 13, a punching plate.
- the associated stamping sheet is produced by means of a method according to the invention.
- a stamped sheet shown in detail in FIG. 5 has a cutting line 17 provided with a total of three interruptions 14.
- the recesses 14 are continuous and thus represent recesses that can be easily checked by a continuity test. This can be done as part of a visual inspection, either automatically via a light beam, which is detected by a photosensor on the other side of the punching plate. In the simplest case, this test can also be performed by operating personnel, which checks the machined punching plate against a backlight source.
- the interruptions 14 are formed as shown in FIG. 5 over the entire width of the punching line 17. In this case, they adjoin areas of a base plate 15 of the stamping sheet 20 that are no longer elevated.
- the laser beam has generated in the base plate 15 continuous recesses or openings.
- the rectangular areas shown in Fig. 5 have been generated by tracing a rectangular contour with a laser beam, not shown, standing vertically on the plane of the figure, wherein the laser beam for the production a smooth end edge orthogonal to the cutting edge 16 of the cutting line 17 was moved.
- FIG. 6 shows a perspective view of a further section of a stamped sheet metal 20 according to the invention.
- An end face 18 of the cutting line has been formed smoothly and in a straight line by the laser beam oriented orthogonally to the surface 19 of the base plate 15.
- the interruption of the cutting line 17 is continued in a recess with edges marked by broken lines, which is formed through the base plate 15 throughout.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Forests & Forestry (AREA)
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Plasma & Fusion (AREA)
- Laser Beam Processing (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102017104154.0A DE102017104154A1 (en) | 2017-02-28 | 2017-02-28 | Method for producing a stamped sheet |
PCT/EP2018/054344 WO2018158127A1 (en) | 2017-02-28 | 2018-02-22 | Method for producing a stamped metal sheet |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3589444A1 true EP3589444A1 (en) | 2020-01-08 |
Family
ID=61627056
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP18710778.4A Withdrawn EP3589444A1 (en) | 2017-02-28 | 2018-02-22 | Method for producing a stamped metal sheet |
Country Status (4)
Country | Link |
---|---|
US (1) | US20190389009A1 (en) |
EP (1) | EP3589444A1 (en) |
DE (1) | DE102017104154A1 (en) |
WO (1) | WO2018158127A1 (en) |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4745835A (en) * | 1981-09-15 | 1988-05-24 | Uarco Incorporated | Fine tooth perforation for webs |
CH680842A5 (en) | 1989-09-22 | 1992-11-30 | Electro Optic Ag | |
WO2004045811A1 (en) * | 2002-11-21 | 2004-06-03 | Franz Vossen | Device for punching blanks out of a flat sheet |
CN101745990A (en) * | 2008-12-01 | 2010-06-23 | 孙春雨 | Cutter wheel for cutting brittle material and processing method thereof |
DE202016100507U1 (en) | 2016-02-02 | 2016-02-15 | Karl Marbach Gmbh & Co. Kg | Laser safety device |
DE102016109925A1 (en) | 2016-05-30 | 2017-11-30 | Wink Stanzwerkzeuge Gmbh & Co. Kg | punching sheet |
-
2017
- 2017-02-28 DE DE102017104154.0A patent/DE102017104154A1/en not_active Withdrawn
-
2018
- 2018-02-22 US US16/489,128 patent/US20190389009A1/en not_active Abandoned
- 2018-02-22 EP EP18710778.4A patent/EP3589444A1/en not_active Withdrawn
- 2018-02-22 WO PCT/EP2018/054344 patent/WO2018158127A1/en unknown
Also Published As
Publication number | Publication date |
---|---|
WO2018158127A1 (en) | 2018-09-07 |
DE102017104154A1 (en) | 2018-08-30 |
US20190389009A1 (en) | 2019-12-26 |
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