Coated woodworking tool

Abstract

The invention relates to a coated woodworking tool, in particular a cutting tool comprising a tool body having a cutting part, on which cutting part a cutting edge is formed. At least the rake face or the rake and flank faces, and the cutting edge of the cutting part are coated with at least one hard-material layer and one sliding layer arranged above the at least one hard-material layer. The sliding layer may be made substantially of sulphides, tellurides or selenides having a transition metal of subgroup Va and VIa of the periodic table, in particular having Mo, Nb, Ta, W, Nb, Ta.

1 - 16 . (canceled) 
     
     
         17 . A coated woodworking tool, comprising:
 a tool body comprising a cutting part having a cutting edge, a rake face and a wedge angle less than about 65 degrees, at least the rake face of the cutting part coated with a hard-material layer; and   a sliding layer containing at least one of sulphides, tellurides and selenides applied to the hard-material layer.   
     
     
         18 . The woodworking tool of  claim 17 , wherein the sliding layer contains ate least one of MoS 2 , NbS 2 , TaS 2 , WS 2 , MoSe 2 , NbSe 2 , TaSe 2 , WSe 2 , MoTe 2 , NbTe 2 , WTe 2  as a substantial element. 
     
     
         19 . The woodworking tool of  claim 17 , wherein the thickness of the sliding layer has a lower limit of one or about 0.2 μm, 0.5 μm and 0.8 μm, and an upper limit of one of about 3 μm, 2 μm and 1.5 μm. 
     
     
         20 . The woodworking tool of  claim 17 , wherein the cutting edge has a cutting edge radius of less than about 10 μm after coating. 
     
     
         21 . The woodworking tool of  claim 20 , wherein the cutting edge radius after application of the sliding layer is less than one of about 5 μm, 1.5 μm and 4 μm. 
     
     
         22 . The woodworking tool of  claim 21 , wherein the cutting edge radius after application of the sliding layer is between about 2 μm and 3.5 μm. 
     
     
         23 . The woodworking tool of claim  1 , wherein the thickness of the hard-material layer has a lower limit of one of about 0.5 μm, 1 μm and 1.5 μm, and an upper limit of one of about 7 μm, 5 μm, and 3.5 μm. 
     
     
         24 . The woodworking tool of  claim 17 , wherein the hard-metal layer comprises at least one compound of TiC, TiN, TiCN, TiAlN, WC, Al 2 O 3 , BC, SiC, VC, CrN, CrBN, CrCN, CrAlN, CrSiN, CrTiN, AlTiN, AlTiCrN, BN, ZrN, ZrCN, AlCrN, Ti2N and SixNy and nanostructured layers consisting of the at least one compound of a plurality of the at least one compound and comprises a substantial component of the hard-metal layer. 
     
     
         25 . The woodworking tool of  claim 17 , wherein the hard-material layer contains at least one of chromium, titanium, aluminium, silicon and zirconium and has a thickness of on of between one of 0.4 and 5 μm, between 0.6 and 4 μm or between 0.8 and 3 μm, and wherein the sliding layer contains at least one of MoS 2 , NbS 2 , TaS 2 , WS 2 , MoSe 2 , NbSe 2 , TaSe 2 , WSe 2 , MoTe 2 , NbTe 2  and WTe 2  and has a thickness of between one of about 0.1 and 3 μm, between about 0.2 and 2 μm, or between about 0.3 and 1.5 μm. 
     
     
         26 . The woodworking tool of  claim 17 , wherein the hard-material layer contains chromium in the form of at least one of Crn, CrBN, CrCN, CrAlN, CrSiN, CrTiN, AlTiCrN, ZrCN or AlCrN in combination with at least one other hard-material compound. 
     
     
         27 . The woodworking tool of  claim 17 , further comprising an MoS 2  layer with an hexagonal lattice structure is deposited onto the hard-material layer. 
     
     
         28 . The woodworking tool of  claim 17 , wherein the wedge angle of the cutting part is between about 40 and 60 degrees or between about 45 and 55 degrees. 
     
     
         29 . The woodworking tool of  claim 17 , further comprising a base body made of HSS, hard metal, cermet or ceramic. 
     
     
         30 . The woodworking tool of  claim 29 , wherein the base body comprises a hard alloy and contains a percentage of at least one of chromium, cobalt, iron, nickel, tungsten, molybdenum and carbon. 
     
     
         31 . A method for producing a coated cutting tool for woodworking, comprising:
 coating at least a rake face of a cutting tool with a hard-material layer;   depositing a sliding layer comprising at least one of sulphides, tellurides and selenides having at least one transition metal of subgroup Vb or VIb of the periodic table onto the hard-material layer.   
     
     
         32 . The method of  claim 31 , further comprising depositing a base layer containing a chromium compound and at least one other ceramic hard-material compound as a hard-material layer and depositing a MoS 2  sliding layer on the base layer by sputtering MoS 2  in a PVD method. 
     
     
         33 . The method of  claim 31 , wherein coating comprises coating a cutting edge of the cutting tool having a cutting edge radius of less than about 7 μm, less than about 4 μm or between about 2 μm and 7 μm.