Tool for machining workpieces

摘要

The tool has a clamping part (2) and a working part (11). It consists of a wear-resistant material, which contains tungsten carbide which has a grain size that lies in the range between approximately 0.2 and approximately 0.5 μm. The clamping part (2) consists of a tough material, which likewise contains tungsten carbide which has a grain size in the range between approximately 0.8 and approximately 1.3 μm. In a transitional region (11) between the working part (11) and the clamping part (2), the proportion of wear-resistant tungsten carbide decreases in the direction of the clamping part (2) to 0 and the proportion of tough tungsten carbide decreases in the direction of the working part (11) to 0. The mixing ratio between wear-resistant and tough tungsten carbide changes approximately steadily in the transitional region (10).

主权项

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.