DD297112A5 - CUTTING ROLLER OR PUNCHING CYLINDER AND METHOD FOR MANUFACTURING SUCH - Google Patents

Abstract

In a cutting roller (1) or a punching cylinder with a roller body (2) and in particular at least over a part of the surface of the roller body (2) extending, raised blade carrier (3) with cutting edge (5) is a higher life compared to conventional cutting rollers (1) achieved by a groove extending over at least part of the circumference of the roll body (2) or over part of the cutting edge carrier (3) with a molded-in tungsten carbide wire, wherein the cemented carbide wire is fixed in the groove and has cutting edges forming a cutting surface. In the case of this cutting roller (1), the cutting edge (5) is formed by a hard metal wire materially connected to the roller body (2) or the blade carrier (3). Fig. 1 {cutting roller; Punching cylinder; Walzenkoerper; Schneidentraeger; Schneidflaeche; Cutting edges; Hard metal wire; groove; Life}

Description

For this 4 pages drawings

Field of application of the invention

The cutting roll or the punching cylinder find application in the rotary cutting of labels, paper, Kunststoffolien-, artificial leather or the like webs for the production / on coffee filters, diapers, name bandages, panty liners or the like, wherein the inventive method is used to produce such cutting car or punching cylinder ,

Characteristic of the known state of the art

It is known that cutting rollers or punching cylinders, which are used for the aforementioned fields of application, have a roller body having at its periphery any cutting shapes or over at least a portion of its circumference extending cutting edges with Schneidfuß, which are carved out of the solid, d. h. That material is removed from the circumference of the roll blank chemically or mechanically, so that only the curved cutting base with Sch suffering remains on the roll body. Therefore, a part of the fabric material corresponding to the height of the cnc must be worked off from the circumference of the blank. In these cutting rollers or punching cylinders dahiär the cutting edge is integrally connected to the roller body or roller body segment. These wheat have the disadvantage that the material may not have too high strength, otherwise the material removal for the production of the cutting edge would be unduly difficult, and thus the production can not be carried out efficiently and inexpensively. As a rule, such cutting rollers or punching cylinders consist of a chromium or high-speed steel in hardened design.

On the other hand, such cutting rollers or punching cylinders due to their low strength on a limited life, since the Sei ..? << Hen wear relatively quickly and thus pile up errors or flawed cuts.

Attempts have been made to extend the service life of the cutting rollers in that the cutting roller or the punching cylinder or roller segments which carry the cutting edge are made of hard metal. However, these segments have the disadvantage that they are extremely difficult to work and therefore not rational and inexpensive to manufacture.

With DE-OS 32 29848 a Schnoidwalze is known, which has interchangeable cutting. Although such cutting rollers can be provided within a relatively short time with a new set of cutting, the life of these cutting rollers remain unchanged short, so that these cutting rollers as often as other, formed with one-piece cutting rollers must be a'isgebaute from their roll mills for overhaul.

Object of the invention

It is to find the target of the invention, cutting rollers or punching cylinder with cutting of high strength and high service life and a method to produce these rationally and kostengüns' _d. Another goal is to minimize the downtime of the cutting machine largely.

Explanation of the essence of the invention

The invention has for its object to provide a Schneidwalzo or a punching cylinder or a punching tool with a one-piece or multi-part roll body in any form and in particular a at least over a part of the surface of the roll body extending, raised Schneidfuß with cutting edge, which described the disadvantages of Exclude prior art and also to provide a method for producing such a cutting roller, a punching cylinder or a punching tool.

According to the invention, these objects are golöst in that the Schnoidonfuß is a Schneidenträgor, along the course of a groove is formed in the heat and a hard metal wire is formed and fixed in a suitable cross-section, and finally to the groove of the projecting part of the hard metal wire, the cutting edge in Form of a cutting surface and cutting edges are formed.

In another embodiment, a groove is formed in the surface of the roll body or roll body segment, in which a hard metal wire is formed and fixed with heat, wherein finally the cutting surface and cutting edges are formed on the groove projecting beyond the part of the hard metal wire. The Schneidonträger is formed in this embodiment of the roll body or roll body segment.

Such a formed cutting roller, a punching cylinder or punching tool has the significant advantage that they are easy to manufacture in that the blade carrier is made by material removal from the surface of the roll blank, this process is easy when using a relatively soft material for the roll blank and therefore cost-effective and rational feasible. In the blade carrier produced by removal of material then a groove z. B. milled and forms the seat for a carbide wire, which is inserted under heat in this groove. The carbide wire is heated to just below its Sintortemporatur, making it plastic and deformable. If the carbide wire has been adapted to the course of the groove and put into it, it is fixed in the groove.

Finally, the roller is ground with inserted carbide wire and the carbide wire provided with cutting edges, whereby the Schnoide is produced.

In the other embodiment, in which the groove is milled directly into the surface of the roll body or roll body segment, the hard metal wire is plasticized in accordance with the previous embodiments with heat supply, so that it can be deformed and inserted in accordance with the course of the groove in this. After setting the deformed and inserted carbide wire, the cutting roller or the punching cylinder is ground round and the cutting edges are formed on the hard metal wire, so that it forms a blade or Wate.

Cutting rolls or punching cylinders produced in this way have the extraordinary advantage that they have a ten to twenty times longer service life compared to their hollow cutting cylinders or punching cylinders, since the carbide cutting edges are only subject to extremely low wear. The machining of the hard metal wire to make the cutting edge can be done economically by means of a suitable tool, e.g. a diamond tool are carried out because only very little material is removed from the hard metal wire.

According to a preferred embodiment it is provided that the cutting edge is produced in a known manner by contour milling. In the process, as much material will be removed from the roller tube until finally only the blade carrier remains, which now protrudes from the surface of the roller body or roller body segment.

Advantageously, the contour of the groove is milled into the blade carrier or in the roll body. The contour of the groove runs in accordance with the course of the later cutting edge.

According to a preferred embodiment, the groove is formed in the roll body or in the blade carrier radif I from the outside with a triangular, rectangular or circular segment-shaped cross-section. The fact that the groove radially from the outside ? .. B.

is milled, is also the hard metal wire radially to the axis of the cutting roller in the groove and is therefore printed under load in the direction of Nutgrundos. This has the advantage that in order to fix the cemented carbide wire in the groove '<requires special precautions and thus the cemented carbide wire must be held in the groove essentially only against the centrifugal force. With different cross-sectional shapes, the groove can be adapted to the occurring when cutting ·) loading forms, so daP. the cemented carbide wire e.g. is supported in a circular segment-shaped groove over a portion of fine circumference over the entire surface of the groove in a triangular groove at two points or two lines in the groove and is supported in a groove with right-angled cross-section either exclusively on the groove base or additionally on the groove side walls ,

According to an advantageous embodiment, the roller body or the roller body segment and optionally the blade carrier are heated to a temperature below the sintered temperature of the hard metal wire prior to inserting the hard metal wire. This has the advantage that when inserting and inserting the carbide wire no local temperature loads arise, whereby the cutting roller or the Stanzzylindc r could possibly be damaged due to very different thermal stresses. This heating of the cutting roller or the punching cylinder can, for. B. done in an annealing furnace.

Preferably, the cutting roller or the roller body segment is slowly cooled after inserting the carbide wire.

This has the advantage that on the one hand the hard metal wire and the cutting roller have the same temperatures, which caused by temperature differences are avoided voltages. On the other hand, the slow cooling avoids gradual temperature fields with different temperatures and resulting stress gradients within the roll body.

As soon as the cutting roller or the punching cylinder and the hard metal wire have a corresponding temperature, the hard metal wire is brazed hard into the groove. For this purpose z. B. commercially available silver solder with additional flux used.

After soldering, the cutting roller is slowly cooled with the carbide wire connected to it to room temperature, so that further caused by temperature differences stress gradients in the joint of groove and Hartmetalldrdht be avoided.

For example, if a preformed carbide wire are soldered into a groove, so the cutting roller is advantageously heated with pickled carbide before soldering the wire, so that both the cutting roller or the roller body segment and the hard metal wire have the brazing for neces sary temperature. After soldering, the cutting roll or the roll body segment is again slowly cooled to room temperature.

Advantageously, the cutting roller or the roller body segment mittols einor auxiliary device is ground round with the soldered carbide wire, whereby unevenness dos metal wire, solder or soldering material, flux or the like are removed. In addition, the cutting roller is already brought to its final cutting diameter. Finally, the cutting edges after the cylindrical grinding z. B. made by means of a diamond grinder, the flanks are already set to the desired cutting angle. In the meantime, the hard metal wire is ground on both sides of the later cutting surface of the cutting edge, whereby the part projecting beyond the groove is formed substantially V-shaped. Advantageously, a cutting surface is produced which has a width of 0.02 to 0.25 mm. The width of the cutting surface depends essentially on the requirements of the subsequent use of the cutting edge.

In a worn cutting roller, the groove can be advantageously prepared by removing worn carbide wires; in particular be soldered. Thus, these cutting rollers are reusable, with the cutting rollers only goreinigt after soldering, z. B. sand or shot peened werdon must. After diesom process, a new carbide wire inserted into the existing groove and festgolötet werdon there again. Finally, a cutting roller produced in this way must still be ground round and the flank of the cutting edge still be made. Thus produced cutting rollers of the punching cylinders have the advantage that they have a comparison with conventional cutting rollers ten to twenty times life, and that in a worn cutting roll or punching cylinder only the worn carbide wire must be soldered and replaced with a new one. Often it is also sufficient to grind the cutting roller or don punching cylinder and rework the Schnoidflanken.

The object underlying the invention is also achieved by a cutting roller or a punching cylinder, whose or the cutting edge forms a Schneidonträger and or one or at least over part of the circumference of the roll body or the Walzer.körpersegmentes or over a part the cutter carrier extending groove having a molded Hartmotalldraht, wherein the carbide wire is fixed in the groove and has a cutting edge forming cutting surface with cutting edges.

As already explained above, the cutting edge is formed by a hard metal wire, which is inserted into a groove and fixed there, which is provided either in the cutting body of the cutting roller projecting beyond the roll body or directly in the roll body or in the roll body segment. In the former case, articles of greater thickness may be cut due to the blade projecting beyond the roll body, whereas in the second case in which the cemented carbide defect is provided in a groove formed directly in the roll body or roll body segment, sheet-like articles have preferably been cut.

Advantageously, the groove is formed radially in the blade carrier or in the roller body or a roller body segment. As also mentioned above, the advantage is achieved thereby that the fixed in the groove carbide wire can be supported evenly in the groove.

A simple processing of the roller blank is achieved in that this and thus the roller body or the Waizenkörpersegment, and optionally the blade carrier made of tool steel or normal steel. Since tool steel or normal steel can be processed very well, a rational and thus cost-effective production of the cutting roller with groove is possible. In addition, rolls made of tool steel or normal steel have greater resiliency than conventional cutting rolls, and thereby provide good elastic support of the cutting edge, which is consequently less subject to stress. If necessary, the roll body or the Waizenkörpersegment or the blade carrier may consist of an air-hardened metal. According to a preferred embodiment, the Har'metalldraht consists of sintered hard metal and may have a circular cross-section or any shape. As is well known, sintered materials have a very high hardness and, moreover, are virtually wear-free. Circular cross sections read carbide wire are therefore preferred because such a trained wire aufv.eist the radial direction in all the same moment of resistance and thus occur when inserting the carbide wire into the groove equal forces or same restoring forces prevail, so that strongly curved or over the whole Circumferential cutting edges are equally good as straight cutting edges can be made.

Preferably, the roller body or the Waizenkörpersegment and the blade carrier are integrally formed. This has the advantage that the cutting roller according to the invention as conventional cutting rollers can be produced, wherein only in the blade carrier, the groove for receiving the hard metal must be incorporated additionally. Thus existing tools can be used further. Necessarily, when the blade carrier covers only a small portion of the cutting roll or punching cylinder surface, the blade carrier can be applied to a subsegment (Walzonkörpersegment) and then connected by screwing with the roll main body, so that the cutting roll is formed in several pieces. According to another embodiment, it is provided that the carbide wire to be inserted into the groove is preformed and has the course of the groove. The deformation occurs in a simple trained auxiliary device, which is similar to the cutting roller in their nature and has the same, the cutting contour corresponding groove. This has the advantage that cutting rollers and their associated hard metal wires, which later form the cutting edge, can be produced independently of each other and thus at different locations and at different times, and if necessary can also be used as a repair kit. Accordingly, cutting rollers with worn or broken blade can be made ready for use again by soldering the carbide wire, inserting and soldering a new preformed cemented carbide wire, and finally grinding the blade to size. Advantageously, roller body segments can also be used directly at the customer in the roll main body, so that times for installation and removal can be reduced or costs for the time-consuming roller transport can be omitted and thus the downtime of the cutting machine is substantially shortened

embodiment

Further advantages, features and details of the invention will become apparent from the following description in which, with reference to the drawing, a preferred embodiment is described in detail. Show

Flg. 1: a partial perspective view of a front side of a cutting roller or a punching cylinder, a part of the

Cutter carrier and the cutting edge pointing; and FIGS. 2 to 4 show a cross-section through a blade carrier and cutting edge shown schematically, successively

Showing manufacturing process of the cutting edge.

Fig. 1 shows a total of 1 designated cutting roller with a roller body 2 and a radially projecting from the roller body 2 and this superior blade carrier 3rd Axial, the roller body 2 continues in a shaft 4, both to drive the cutting roller 1 as well their storage serves. The blade carrier 3 has a cutting edge 5 and two cutting edges 6 forming the cutting edges 6 and 7. The reproduced in Fig. 1 cutting roller 11st Although formed without support rings, but the invention should not only relate to those without support rings, but also on cutting rollers 1 with support rings. The support rings have the task to protect the carbide wire under special load from shocks and excessive compressive stresses and to ensure the necessary distance of the cutting edge to the counter-cutting part. The counter-cutting part may be a full-surface smooth trained body. The counter-cutting part can also be a woofore cutting roll manufactured in mirror image to the cutting drum 1. Outside the roll body 2 and the blade carrier 3 are made in one piece or mehtstückig, wherein the invention is also on two- or multi-part roll body 2 and Schneidenträgor 3, in particular Walzenkörpersegmento (not shown), which are used in the roll body 2 to relate.

With reference to Figures 2 to 4, the manufacturing method of a cutting roller 1 according to the invention will be described below. From one consisting of a tool steel or normal steel roller blank z. Example, by means of a milling material removed such that a roll body 2 radially overhanging and at least partially extending over the circumference extending cutter support 3 stops. This cutting bearing 3 is thus integrally connected to the roller body 2 or the roller body segment. The height of the blade carrier 3 is dependent on the later use of the cutting roller 1, i. on the thickness of the material to be cut. The blade carrier 3 can be provided at its free end with chamfer 8.9, which on the one hand reduces the risk of injury, on the other hand, the risk of damage to the blade carrier 3. In the front end 10 of the cutter support 3, a groove 11 is milled, which has a triangular cross section in the embodiment shown in Figures 2 to 4. The groove 11 may also have a rectangular or a circular segment-shaped cross-section. If the cutting roller 1 completed so far that the blade carrier 3 is provided with a groove 11, the cutting roller 1 is in an oven slowly to below the sintering temperature of a hard material, for. B. a carbide heated. After reaching this temperature, a hard metal in the form of a carbide wire 12 with further supply of heat, for. B. by means of a welding torch, plasticized and inserted into the groove. By successive heating and insertion of the carbide wire 12 in the groove 11, this assumes the course of the groove 11. By heating the hard metal wire 12 into the region of its sintering temperature, this becomes deformable and can thus be adapted to the course of the groove. After the carbide wire 12 is inserted into the groove 11, the cutting roller 1 is heated in the oven until it has the required temperature. Once the cutting roller has reached this temperature, it is removed from the oven and the groove 11 located in the carbide wire 12 while supplying a flux and a hard solder, for. As a silver note or the like, soldered. In the embodiment shown in FIGS. 2 to 4, the hard metal wire 12 abuts the groove wall at two points 13 and 14, whereas the cavities 15, 16 and 17 are filled with silver solder 18. In this case, the silver solder 18 underflows and underflows due to the capillary action the hard metal wire 12 and connects it cohesively to the wall of the groove 11 of the cutter support. 3

After soldering the hard metal wire 12, the cutting roller 1 is further cooled, so that it does not come to cracks in the hard metal wire 12 due to different Wärmeausdeh.tungen and resulting voltage gradients. If the cutting roller 1 has reached room temperature, it is clamped in a grinding device and ground round. As shown in Fig. 3, while the frontal, the groove 11 opposite end 19 of Hartmstalldrahtes 12 is sanded. The cutting roller 1 now has a uniform diameter over the entire wire surface. As a tool, a diamond grinder is preferably used. After the cylindrical grinding of the cutting roller 1, the cutting edges 20 and 21 are produced in that the hard metal wire 12 is ground on both sides. In this grinding process, the cutting edges 20 and 21 already get their er.dgirltlyen cutting angle, teilv is ironed but only on the carbide wire 12 of the cutting angle, the chamfers 8 and 9 of the cutter support remain unprocessed. In addition, the grinding depth depends on the width of the end-face cutting surface 22, which may have a width of 0.02 to 0.25 mm. When grinding the cutting edges 20 and 21 also the blade carrier 3 in the region of their chamfers 8 and 9 is ground so that it is aligned with the cutting edges 20 and 21, if this is necessary for the required cutting edge shape. After completion of the cutting edge 5, the blade carrier 3 has a fine shape, as shown in Fig. 4> 3t. If the chamfers have been worked, the blade carrier 3 with its new chamfers 8 'and 9' moves in alignment into the cutting edges 20 and 21 of the carbide wire 12, which in turn has the cutting face 22 on the front side. In a cutting operation, the cutting surface 22 is loaded. Here, the hard metal wire 12 is supported via the points 13 and 14 on the wall of the groove 11, wherein ar at difson points 13un 114 rests directly against the wall of the groove 11. The cavities 15,16 and 17 are filled with silver solder 18 and form an elastic support for the tungsten carbide wire 12. As also shown in Figure 4, de, hard metal wire 12 is in the groove 11 so that he sinen about a large part of its circumference cohesively connected to the blade carrier 3. Under radial load, i. in the radial direction of the cutting roller 1, the Hartrmtalldraht 12 is supported exclusively in the groove 11 from. Even if the direction deviates from the radial direction, a secure hold is ensured since the carbide wire 12 is still subjected to pressure. The main task of the soldering is to keep the carbide wire 12 securely in the groove 11, in particular against the centrifugal force occurring during the rotation of the cutting roller 1. However, the invention relates not only to cutting rollers or punching cylinders with soldered carbide wires 12, but also to those, if necessary, fixed by means of high strength adhesives carbide wires 12. A bracing, jamming or mechanical attachment of the carbide wire 12 in the groove 11 is also possible.

An overhaul of a cutting roller 1 with a carbide wire 12 with worn cutting edge 5 takes place in that the cutting roller 1 on Durchmessorder cutting surface 22dorSchnoidwalze 1 is überschliffon and the cutting edges 20 and 21 are reground until the cutting surface 22 again has the new condition. Another possibility is that it is heated in an oven to the melting temperature of the brazing material 18, so that the worn carbide wire 12 can be removed from the groove 11. After removal of the carbide wire 12, the groove 11, z. B. by means of a ball or sandblast blower, cleaned. The cutting roller 1 is now ready to receive a new carbide wire 12, which is either borte preformed bores inserted into the groove 11, or, as described above, adapted to heat the course of the groove 11. After soldering, cylindrical grinding and grinding of the cutting edges 2C and 21 of the new carbide wire 12, the cutting roller 1 is ready to use, without the roll body 2 and / or on the cutter support 3 changes would have to be made.

However, the invention is not limited to the fact that a carbide wire 12 is inserted into a groove 11 provided in a blade carrier 3. The groove 11 may also be provided directly on the circumference of the roller body 2, so that the hard metal wire 12 is verbundon directly with the roller body 2 or Walzenkörporsegment and this projects only slightly with its cutting edges and its cutting surface.

Claims (24)

1. Cutting roll or punching cylinder with a roll body or roll body segments and in particular a at least over a part of the surface of the roll body extending, raised Schneidfuß with cutting edge, characterized by a at least over part of the circumference of the roll body (2) or over a part of groove (11) with a molded carbide wire (12) formed as a cutting carrier (3), the carbide wire (12) being fixed in the groove (11) and having cutting edges (20 and 21) forming a cutting surface (22). 2. Cutting roller or punching cylinder according to claim 1, characterized in that the groove (11) is formed radially in the blade carrier (3). 3. snow roller or punching cylinder according to claim 1, characterized in that the groove (11) in the roller body (2) or in a roller body segment is formed. 4. cutting roller or punching cylinder according to one of claims 1 to 3, characterized in that the roller body (2) and g. if necessary, the cutter carrier (3) consist of tool steel or normal steel. 5. cutting roller or punching cylinder according to one of claims 1 to 4, characterized in that the hard metal wire (12) consists of hard metal. 6. cutting roller or punching cylinder according to one of claims 1 to 5, characterized in that the groove (11) is triangular, rectangular or circular segment-shaped. 7. cutting roll or punching cylinder according to one of claims 1 to 6, characterized in that the hard metal jet (12) has a circular or other cross-section. 8. cutting roller or punching cylinder according to one of claims 1 to 7, characterized in that the roller body (2) and the blade carrier (3) are integrally formed or multi-piece. 9. cutting roll or punching cylinder according to one of claims 1 to 8, characterized in that in the groove (11) to be inserted carbide wire (22) is preformed and has the Veriauf the groove (11). 10. cutting roll or punching cylinder according to one of claims 1 to 9, characterized in that it consists of a support shaft with bolted or secured in other form segments, which are provided with carbide cutting edges. 11. A method for producing a cutting roller, a punching cylinder or a punching tool with a roll body or roll body segments for any cutting shapes and at least over a part of the surface of the roll body oci r roll body segment extending, raised Schneidfuß, characterized d. ß the Schneidfuß a blade carrier along the course of a groove is incorporated, in which a hard metal wire is formed and fixed under heat and finally the groove projecting beyond the part of the carbide wire, the cutting edge in the form of a cutting surface and cutting edges are formed. 12. A method for producing a cutting roller with a roll body or roll body segments, characterized in that in the surface of the roll body or roll body segment, a groove is incorporated as a blade carrier, in which a heat and a carbide wire is formed and fixed, and that finally to the groove superior Part of the carbide wire cutting edges or wading or Doppelwaten be formed. 13. The method according to claim 1 or 2, characterized in that the Schneidenträyer is prepared in a known manner by contour milling. 14. The method according to any one of the preceding claims, characterized in that the contour of the groove in the blade carrier or in the roller body or in a roller body segment is milled. 15. The method according to any one of the preceding claims, characterized in that the groove χ · ο jial from the outside with a triangular, rectangular or circular segment-shaped cross section in the blade carrier or in the roller body or the roller body segment is formed. 16. The method according to any one of the preceding claims, characterized in that the roller body or the roller body segment and optionally the blade carrier are heated to below the sintering temperature of the carbide wire before inserting the carbide wire. 17. The method according to any one of the preceding claims, characterized in that the cutting roller is slowly cooled after inserting the carbide wire. 18. The method according to any one of the preceding claims, characterized in that the hard metal wire is brazed into the groove, or is securely fixed with another bonding agent or binder or a mechanical attachment in the roll body or in the roll body segment. 19. The method according to any one of the preceding claims, characterized in that the cutting roller is heated with pickled carbide wire for soldering the wire. 20. The method according to one of the ve Vergehen claims, characterized in that the sonicating roller is soldered with molten carbide wire slowly cooled to room temperature. 21. The method according to one of the verhergehenden claims, characterized in that the £ ~ hnoidwalze is ground round with molded carbide wire. 22. Ve. Ahren according to claim 21, characterized in that cutting edges after the cylindrical grinding ζ. B. by means of a diamond grinder or by erosion or by other known methods, the flanks are already set to the required cutting angle. 23. The method according to any one of the preceding claims, characterized in that a cutting surface of 0.005 to 0.5 mm, in particular 0.02 to 0.25 mm width is produced. 24. Worship according to one of the preceding claims, characterized in that the groove is made by removing worn carbide.