WO2010081734A2

WO2010081734A2 - Stamped sheet metal and method for producing same

Info

Publication number: WO2010081734A2
Application number: PCT/EP2010/000242
Authority: WO
Inventors: Alan De Natris
Original assignee: Wink Stanzwerkzeuge Gmbh & Co. Kg
Priority date: 2009-01-19
Filing date: 2010-01-18
Publication date: 2010-07-22
Also published as: DE102009005436A1; WO2010081734A3

Abstract

The invention relates to a stamped sheet metal for stamping one- or multi-layered materials, such as labels, envelopes or stickers, comprising a stamping body having at least one stamping edge, wherein the stamped sheet metal can preferably be fixed either magnetically or by means of clamping on a stamped sheet metal holding device and the stamping edge wears off during use, and wherein the stamped sheet metal comprises at least one positioning means for sharpening the already existing stamping edge after its wear or an additionally applied stamping edge, characterized in that said positioning means allows a preferably automatic processing and positions the stamped sheet metal relative to a device for processing the stamping edge. A method for the renewal of a stamped sheet metal is also claimed.

Description

Punching sheet and method for producing such

The invention relates to a stamped sheet for punching e.g. Labels, envelopes or other paper or film-like monolayer or multilayer materials of a preferably flat material, with a punched edge having at least one punching edge, wherein the punching plate may be held either magnetically or by clamping on a stamping sheet holding device and the punching edge wears down in use , Furthermore, the invention relates to a method for renewing a stamped sheet.

A prescribed stamping sheet is usually made from a raw sheet steel. During an etching process, raised areas protected by a polymer, wax or lacquer coating are formed, which are sharpened into stamped edges. For positioning the sheet on a device for sharpening these raised areas are previously investment edges, pass marks, or similar. used, which are separated before shipment of the sheet. During sharpening, moreover, the sheet is held on an engraving table of the device, for example by means of negative pressure or magnetically. In addition, the sheets are optionally bent to be used on punching sheet holding devices. Under stamping sheet holding devices are in particular punching or rotary cylinder or especially in non-rotating systems to understand magnetic flat foundations.

In the production of labels, a stamped sheet is then held on a punching cylinder, for example by way of magnets, and used for a large number of punched holes. The sharpness of the punching edge is determined by its edge portion, the preparation of the cutting tip or its width or the width of its tip and should be less than, for example 0.01 mm. Through a variety of punching operations

BESTATIGUNΘSKOPIE the punching edge wears off. In particular, this wear of a punching plate on a magnetic cylinder and at a plurality of transverse to the material web direction punched edges or bent cutting lines having punching edges in the transverse direction is less strong than in the longitudinal direction. The thickness of a 0.440 mm thick stamped sheet changes, for example, with respect to its in the transport direction of the material to be punched transverse punching edges by 0.01 mm and with respect to its longitudinal punching edges by 0.02 mm. Instead of an approximately acute cutting edge, the edges are rounded after a plurality of punches and blunt, which can be seen by a person operating, for example, based on a faulty detachment of labels from a carrier medium.

In the prior art, the wear or the height removal of the punching plate is counteracted by adjusting the height of the punching cylinder or the counter-punching cylinder. A shortening of the height difference between the cylinders is only possible to a limited extent. As soon as the punched edges are sustainably rounded, the material to be punched is no longer separated cleanly. When punching labels, they are taken into the waste grid and do not remain as intended on the carrier medium. In this condition, the stamped sheet is worn. Usually, in such a case, punching plates are completely rebuilt by the respective manufacturers.

However, rising raw material costs for sheet metal, which is usually made of steel, are increasingly driving up the costs of these. It is therefore an object of the present invention to renew a described in the prior art worn punching sheet cheaper. The object is achieved by an article according to the preamble of claim 1, which is developed according to its characterizing part. Furthermore, the object is achieved by a method for producing a stamping sheet according to claim 8.

According to the invention it is provided that the stamped sheet for resharpening the existing punching edge has at least one positioning means which serves to position the punching sheet relative to a device for reworking the punching edge. This positioning means is already attachable during production of the punching plate prior to its first use. Conventional abutting edges of punching sheets are generally insufficient for such positioning because they have either been removed prior to use of the punching sheet on a stamped sheet metal fence, or the position of the punching sheet on the punch sheet holding apparatus is coarse and inaccurate compared to the fineness of the punching edges , However, an inaccurate regrinding or sharpening would destroy the punching edge. The corresponding positioning means thus allows a positioning with an accuracy that corresponds to the accuracy of the punching edges. Otherwise, a reworking of the punching edges and resulting from this punching line would not be possible.

A renewal of the punching plate can also be done by applying additional punching edges to the existing ones, in which case the post-processing of the present invention provided with a positioning means, precisely positionable punching plate then especially the newly applied edges and possibly the existing edges are sharpening.

Advantageously, the positioning means allows automatic post-processing of the punching edge. This may be, for example, a positioning - A -

act a CNC-based milling machine or engraving in which the punching edge of the punching plate is nachgefahren based on existing from the first production of the punching plate NC codes. The decreasing total thickness of the sheet can be compensated in this case via a variation of the punching machine operated with the punching plate. Optionally, the basic thickness of the punching plate can be brought to the desired height before or after the post-processing and thus a compensation of the punching machine is not necessary.

A method according to the invention for the (re) production or renewal of a stamped sheet thus distinguishes itself by the hitherto non-existent use of a stamped sheet already used and provided with at least one stamping edge to be sharpened, wherein the stamped sheet on a device for sharpening a punched edge is accurate by means of a positioning means is positioned. The stamped sheet is formed in particular according to one of claims 1 to 7. On the device can then be traversed, for example, due to an already existing or generated NC machine code formed by the cutting edge cutting line, at the same time the cutting edge is sharpened. The punching edge, which is preferably formed by a raised portion of the punched body, can be sharpened, for example, by a tensioning method. A laser-assisted sharpening of the cutting edge can also be advantageous. In an advantageous embodiment of the method according to the invention, the worn cutting edge can, for example, be traced through an optical recognition device, identified and localized, in order then to be sharpened on the basis of the position data obtained in a subsequent step.

In a further advantageous embodiment of the invention, the positioning means comprises at least one marking of the stamping sheet, in which, for example, way around a parallel to the punching edge lines, which is optically scanned during resharpening can act. In a further embodiment, it is provided that the positioning means has at least two markings, via which a starting position for sharpening is exactly defined on the corresponding device. Even over a single mark with a corresponding shape in the longitudinal and transverse directions, the sharpening device can successfully sharpen a punching edge.

The marking may advantageously be a change in thickness of the stamped body, which is formed by a depression or elevation of regions of the stamped body. In a particularly simple case, it may be a hole having a round or another contour.

In a further particularly simple and thus advantageous embodiment of the invention may also be defined areas of edges or corners of the punching sheet, but it should be noted that this can be exposed by transport to the customer, use and return to the punching sheet manufacturer damage.

Advantageously, the positioning means comprises a positioning device, which is designed in particular for outputting a positioning signal and, in particular in interaction with a correspondingly designed device for sharpening the stamping sheet, enables the exact positioning of the stamping sheet on the machine. This may be, for example, mirrored surface areas or even an optically invisible signal emitting RFID chip. The alignment of a punched sheet to be sharpened on a corresponding system can then take place automatically. Also the contour of the Cutting lines themselves can be used as a positioning mark as a whole by optical recognition in order to be able to specify a correct starting point in a method according to the invention for resharpening.

The stamped sheet to be reworked is further improved, in particular, if it further comprises a wear detection means, which enables the processing personnel to recognize a wear process. This is preferably at least one information carrier which changes during the use of the punching plate, e.g. in the form of a colored marking, which changes its color depending on punching operations carried out, with a correlation between the wear of the punching edge and the release of differently colored areas. Or in the form of several punch marks, which are subject to significantly higher wear in the area of the punching waste due to the sensitive design and which document the relative wear due to their punching capability.

Furthermore, the stamped sheet can advantageously as a wear detection means influenceable via a use of the sheet sensor or information storage, in particular a pressure or acceleration or centrifugal force sensor, in an active or passive manner by advantageously compressive or centrifugal force due to revolutions as a punching cylinder trained Punching plate holding device has influenced information and this available retrievable or gives of itself. This may also be a sensor in which a variation of the signal occurs due to wear of the material of the sheet. Likewise, acceleration sensors may be provided when stamping sheet held on a magnetic flat foundation. In particular, a stamped sheet to be reworked for a magnetic cylinder and generally bent is to be brought into a non-curved shape on a re-sharpening machine before positioning, which then permits positioning on the device. The arranged positioning means must therefore be able to withstand bending and possibly kinking.

Furthermore, it has proven to be advantageous to clean the punching sheet to be sharpened before sharpening, which can happen in particular in a mechanical or chemical manner in a device provided, for example, with brushes and spray nozzles.

Advantageously, a measurement of the height and / or the width of the punched sheet to be sharpened is likewise carried out, in order to be able to make an automatic decision with regard to re-sharpening, in particular. Such a decision then provides the information about depth and cutting angle of the punching edge. The information about a resulting by the post-processing thickness of the sheet for at least a portion of the punching plate can be advantageously stored on a stamping sheet associated, preferably arranged on or in this information carrier to improve the operation of a punching machine with respect to the now set new dimensions , Such an information carrier may preferably be an RFID chip.

In particular, by laser deposition welding are to be replaced completely or new punching edges on the resharpened punching sheet to change the shape of the punching edge or the resulting punching pattern. Further advantages and details of the invention can be taken from the following description of the figures. In the schematic figures of the figures shows:

1 is a plan view of a punching sheet according to the invention,

2 shows a part of an article according to the invention during a punching process,

3 shows a positioning marking of a punching sheet according to the invention,

4 shows another positioning mark,

Fig. 5 shows a further positioning mark.

Equal or similar parts are provided with identical reference numerals, if appropriate. Individual technical features of the exemplary embodiments described below can also lead to developments of the invention with the features of the above-described embodiments.

A punched sheet according to the invention according to FIG. 1 comprises a punched body 1, on which four substantially square punched contours or lines are formed by a plurality of punched edges 2. The punched edges 2 are raised relative to the rimmed areas 3 and the bordering areas 4 of the punch body 1 and provided in the original state of the punching plate, for example with a height of 0.32 mm. The areas 3 and 4 have, for example, a thickness of 0.12 mm. Any docking aids 5 for the positioning of the flexible punching plate made of steel on a magnetic cylinder are due to their size and the existing game in the Usually not accurate enough to allow re-sharpening of the punched edges. For this purpose, the stamped sheet therefore according to the invention positioning means or markers 6, which are formed in the form of two thin and spaced from each other arranged holes. By means of these small holes in the base body 1, an exact position can be determined via a crosshair of an engraving machine (see Fig. 3). A sharpening / engraving of the punching plate 1 is thus possible.

During a punching operation, a punching sheet according to the invention with its pointed edge 7 (FIG. 2) cuts into a flat, generally three-layered material 8 and cuts its upper 9 down to the depth of a carrier layer 10. Instead of a three-layered material, it can also be a - act two or more than three-layer material. A possible adhesive layer 11, the upper 9 with the Träqermateria! in v ^p rhinrlet is also still touched. The area between upper 9 and punch body 1 is still filled to a small extent by a pressure layer 12 and a wear detection means 13. The means 13 presses partially into the unneeded regions of the upper material 9 and therefore wears off in a region 14. By a multi-layered ink layer come with increasing wear of the means 13 and the area 14 in this different colored layers that represent the wear of the punching edge 7, for example, to the dashed line 15 information about the wear of the punching edge. Also conceivable would be a wear mark in the form of multiple punch marks, which are completely attached next to the actual punching edges and indeed executed so that they are formed by their geometry so that they are subject to higher wear by their punching ability to document the relative wear. For the post-processing of the punching edge 7, a crosshair 16 (FIG. 3) of an engraving machine is applied to each of the hole-shaped positioning means 6 (compare FIGS. 1 and 3). The latter has, for example, a diameter of 0.05 mm. The thread width of the reticle 16 is in this case, for example, about 0.05 mm, so that when superimposing the crosshairs 16 with the positioning means formed by the hole 6, an overlap is created, which allows with sufficient accuracy an initial position of the sheet on an engraving machine.

Instead of a hole, any forms of positioning means or markings are conceivable. For example, the positioning mark can be formed by a circumferential recess 17 with a central elevation 18 in order to center the crosshairs in this case as well. It may also be elevation 19, which can be covered with the crosshair (Fig. 4, 5). Also advantageous for an automatic post-processing can be a determination of the position of the punching plate and / or a positioning of the punching plate by an optical scanning of the worn punching edge (2) by means of an optical detection device, for example by scanning by laser or by the use of a raster.

Claims

Claims:

1. stamping sheet for punching single or multi-layer materials, such. Labels, envelopes or stickers, with at least one punched edge (2,7) having punch body (1), wherein the punching plate is preferably either magnetically or by clamping on a punching sheet holding device is fixed and the punching edge (2,7) wears in use, characterized characterized in that the punched sheet for sharpening the existing punching edge (2,7) after their wear or an additionally applied punching edge at least one preferably automatic post-processing permitting positioning means (2, 6,17, 18,19), which the positioning of the punching sheet relative to a device for Nachbsarbeitsrs the punching edge (2,7) is used.

2. punching sheet according to claim 1, characterized in that the positioning means (6,17, 18,19) comprises a marking of the punching plate.

3. punching sheet according to claim 1 or 2, characterized in that the positioning means (6,17, 18,19) by a change in thickness of the punch body (1) is formed.

4. punching plate according to one of the preceding claims, characterized in that the positioning means (6,17, 18,19) comprises a positioning device which is designed to deliver a positioning signal.

5. punching sheet according to one of the preceding claims, characterized in that the stamped sheet comprises at least one wear detection means (13).

6. punching plate according to claim 5, characterized in that wear detection means (13) comprises at least one changing in the course of use of the punching plate information carrier.

7. punching sheet according to claim 5 or 6, characterized in that the wear detection means (13) influenceable via a use of the sheet sensor or information storage, in particular a pressure or centrifugal force sensor comprises.

8. A method for renewing a stamping sheet, in particular according to one of the preceding claims, wherein the stamped sheet is already used and provided with at least one resharpening punching edge (2,7), characterized in that it is mounted on a device for sharpening a punching edge by means of a positioning means (6 , 18,19) is positioned exactly.

9. The method according to claims 8, characterized in that the post-processed stamped sheet is brought into a mold before positioning, which allows a positioning of the punching sheet to or on the device.

10. The method according to any one of claims 8 or 9, characterized in that the stamped sheet is cleaned before sharpening.

11. The method according to any one of claims 8 to 10, characterized in that the stamped sheet is measured prior to resharpening, in particular to be able to make a preferably automatic decision regarding re-sharpening.

12. The method according to any one of claims 8 to 11, that an information about a thickness of at least a portion of the punching sheet is stored on a stamping sheet listener, preferably arranged on or in this information carrier.

13. The method according to any one of claims 8 to 12, characterized in that an additional punching edge is applied to the nachzuschaeft punching sheet.