Studies have been conducted on the turning of tungsten cutters equipped with plates of high-speed steels R18, Р12Ф5М and solid alloys VK8, ВК60М, ВК15М. The geometry of cutters: a=10−12°, γ=15°, γ f= 0°, φ = 45°, φ1 = 15°. Sharpening cutting tools made of hard alloys produced diamond circle DIA, high speed steel — round DL; after sharpening the cutters brought on a cast iron plate with boron carbide powder. The criterion of blunting is the flank wear h3 = 0.6 mm.
The durability of the cutting tool
Studies have shown that the resistance of the cutting tool does not exceed a few minutes. It is therefore advisable to evaluate the cutting properties on the treated area. When turning the carbide cutter alloy ВК60М the cutting speed from 60 to 5 m/min allows to increase the resistance from 2 to 4 min. But the surface area is machined to a blunting of the cutter decreases by more than 5 times (from 22•103 up to 4•103 mm2). Thus, the desire to increase durability leads to a huge decrease in performance (more than 10 times).
Feature machining tungsten
The best results are tungsten-cobalt alloys ВК60М and ВК10ОМ with ultra-fine structure, which in optimal conditions allow to increase the area of cultivated surface in 3.5 and 2.5 times respectively, compared to the hard alloy VK8. The dependence of wear resistance of tool from cutting in the processing of tungsten are complex. The highest abrasion resistance is achieved when working in a narrow range of cutting speeds (υ = 30−40 m/min for the alloy ВК15М and υ = 45−60 m/min for alloys VK8 and ВК60М) and flows (s = 0.3−0.4 mm/Rev).
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