Stanzmesser für stanzwerkzeuge mit gekrümmtem schnitt

The invention concerns Stanzmesser in Bandoder staff form of iron basis alloys for the production of punching tools for a curved cut existing essentially out, in the cross section seen, a flat measurer back with at least one to it following transition piece, which tapers to the cutting edge, preferably with an angle from 5 to 20B °, in particular s of approx. 12& ', tapered, trained it is and a resumed wedge-shaped gumption part with a cutting edge angle from 40 to 60 °, 45 to 55 ° for the production of tools for punching out surface parts from laminar materials such as Gerbwaren, fabrics, material or such a thing, how it is usual for example in Lederund textile industry, punching measurer volumes or punching measurer staffs is preferably bent in such a manner that the essentially closed line the desired formed by the cutting edge outlined the surface part corresponds. It can be necessary to bend the ready for use punching measurer volume with small radii in order to form out as little as possible rounded cut corners in the punching property. Bending the Stanzmessers causes however a material stressing rising with smaller becoming bending radii and higher bending angle with a plastic deformation in Zugund pressure range of the measurer. For the avoidance of s separation breaks and fragmentation within the cutting edge range from there the punching measurer material must exhibit on the one hand a sufficiently high ductility; in order to achieve on the other hand high punching series numbers of items, is the knife a as high hardness and a firmness as possible to exhibit, because also small deformations can affect extremely unfavorably the punching procedure and delivering the punching property. For the improvement of the use-self-scolded and increase of the service life of punching tools it is well-known to harden the cutting edge of the Stanzmessers whereby by a thermal treatment a case hardening thickness with increased material hardness is often intended from 0,4 to 0.8 mm. With so cut-hardened punching measurer volumes or punching measurer staffs are comparatively high punching series of approx. 30.000 to 50,000 stucco and more attainable, however an H is rtungssprödigkeit in the cut-producing range near the surface often not preventable, whereby occasionally lip breaks oderausbrüche can occur. Such error features arise particularly pronouncedly, if, in the cross section seen, the cutting edge lies not in the broadside longitudinal pitch level. From at-B-396773 is a regrindable Spanermesser admits become, which cutting measurer exhibits, that is with an even contact surface perpendicularly on the carrier surface of the measurer body touched down and along the plant edges schweißverbunden. Such Spanermesser serves for the production of wood chips with limited width. In accordance with JP-B 79005366 also a measurer form is well-known for curved cuts, whereby the knife blades exhibit high flexibility, but no appropriate Schneidhaltigkeit. A Stanzmesser with high stability (EP-A1-99004), which exhibits a gumption part from sintered hardmetals a5, which is connected to such with a substrate by soldering, sticking od., can for being certain gumption forms is favourably used, however training of curved cuts is complex and OF not executably. It was also tried to increase the cut load by a Hartstoffoder sliding material coating of the gumption flanks. Thus the gumption deaf waste could be reduced and the Schneiddruck be made smaller, a substantially increased service life of the tool in the field use could not be caused however by this surface treatment. The invention is the basis now the task to create a Stanzmesser in Bandoder staff form which can be bent during punching tool production sharp edged and by high hardness and substantially long-term customs own improved good wear characteristics within the cutting edge range to create the work, zeuges effectuation. This task is solved with a Stanzmesser of the kind initially specified thereby that a carrier part and the gumption part from different alloys and/or materials with different chemical composition, formed made of measurer back as well as transition piece, exist and that the connection between the parts is provided by a metallic connection surface zusatzwerksttoffirei. The advantages reached by the invention are to be seen essentially that the specifically highly stressed gumption part with the cutting edge, which good long-term cut characteristics exhibit sotl, from a high-speed steel are formed, which material can be obtained by a thermal treatment a high firmness and/or stability with special Schneidhaltigkeit of the edge. It quite was for the material oh man surprising that from high-speed steel a formed S can be bent chneidteil tear-free with the carrier form also sharp edged, without corner cracks and/or material fractures develop. Alloy-technically it proved as particularly favourable, if the carrier part from a Vergütungsoder tool steel with a chemical composition essentially in Gew. - % of RK 402,482 B 0.35 to 0.7 C 1.0 to 2.5 SI 0.40 to 2.0 Mn 0.5 to 2.0 CR 0.01 to 0.5 V further additives up to a total concentration of 2,0 as well as iron and production-determined impurities if necessary exists and that the gumption part from high-speed steel with a composition in Gew. - is containing formed for % from 0,75 to 1.2 C 1.2 to 2.4 V and essentially the alloying elements CR, Mo and/or W as well as CO in actually well-known concentrations. It is reached by a such choice of the chemical composition of the steel that a necessary ductility of the materials in the ready for use condition of the Stanzmessers are adjusted 7s can and an embrittlement of the metallic connection surface is avoided through for example diffusion features like a carbon diffusion with security. If in accordance with a further preferential form at least the surface of the carrier part is decarburized preferably with a depth of approximately 0.2 mm, whereby the cutting edge is through in the edge range decarburize-free sides of the gumption part formed, a special stability of the sharp edged tear-free bent volume in the tool is reached. Preferred the ready for use punching measurer volume exhibits and/or the punching measurer staff the following material hardness values: Carrier part and/or measurer back: Center 36 to 41 HRC carrier part and/or measurer back: Surface under 204 HB gumption part and/or cutting edge: 50 to 60 HRC. 2s with above material self-work were to be achieved also with tools also in the process sharp-angular cutting edge lines high lasting and being gene work. With particularly high security a bending fragmentation at the measurer is avoided, if, in the cross section seen, who length of the connection between carrier part and gumption part of 0.12 to 0.5, preferably 0.2 to 0.4 times the thickness of the measurer back amount to. On the basis of only a design representing a remark way the invention is to be described more near. In Fig. 1 is represented a symmetrical punching measurer volume 1 in the cross section. At a planparaUelen flat measurer back on one side a transition piece 3 with a Keilwinkel/3 of 12,5 attaches 2 °. At the end of the transition piece 3 a wedge-shaped gumption part of 4 under education of a connection surface 43 connected by electron-beam weld with the transition piece 3 is, whereby a transverse extending of the connection surface amounts to 0.25 times the thickness of the measurer back. A such volume with a measurer back thickness of 2.2 mm and a total width of 35 mm was made of materials DIN material No. 1,8159 for the carrier part and the DIN Werkstofl No. 1,3247 for the gumption part, recompensed and worked on heat treated. The side flanks of the measurer back 2 and the transition piece 3 exhibited a decarburized outer zone with a thickness of 0.22 mm, which decarburized outer zone continued rapidly making smaller still slightly into the cutting edge part of 4. The flanks, which formed the cutting edge 41 with an angle of 48 °, were completely decarburize-free in the cutting edge range. A material testing resulted in the following hardness values: Center measurer back 38 HRC surface measurer back 200 HB (decarburized material) gumption partial edge and edge range 54 HRC with above punching measurer volume were manufactured punching tools, which were used for the treatment of glass fiber mats and carbon fiber fabric compound fabric plies. Service lives of the tool could be obtained with the employment of the measurers so according to invention in the comparison with cut-hardened Stanzmessern up to 8.3-lache.