Patent ID: 8794879
Filing Date: 2014-08-05
Classification: B23B,B23C,B23G,Y10T

Abstract:
1. A tool for processing workpieces, the tool comprising: a clamping part comprised of a tough material containing a first tungsten carbide and cobalt, wherein cobalt is a binder for the first tungsten carbide; a working part comprised of a wear-resistant material containing a second tungsten carbide and cobalt, wherein cobalt is a binder for the second tungsten carbide; a transition region connecting the clamping part and the working part; wherein the first tungsten carbide of the tough material has first tungsten carbide particles of a grain size in the range between approximately 0.8 μm to approximately 1.3 μm; wherein the second tungsten carbide of the wear-resistant material has second tungsten carbide particles of a grain size that is in the range between approximately 0.2 μm to approximately 0.5 μm; wherein in the transition region between the working part and the clamping part a proportion of the second tungsten carbide particles decreases to 0 in a direction toward the clamping part and a proportion of the first tungsten carbide particles decreases to 0 in a direction toward the working part; and wherein a mixing ratio of the first tungsten carbide and the second tungsten carbide in the transition region changes gradually and approximately steadily; wherein the decrease to 0 of the proportion of the first tungsten carbide particles beginning at the clamping part occurs across a first axial length of the tool and the decrease to 0 of the proportion of the second tungsten carbide particles beginning at the working part occurs across a second axial length of the tool, wherein the second axial length is longer than the first axial length.