Processing characteristics of molybdenum, tantalum, niobium and their alloys

In the process of sintering and smelting, the surface of molybdenum, tantalum and niobium is uneven, and there are some defects such as suction layer, subcutaneair hole and shrinkage hole, which make the processing performance is very poor. Molybdenum alloy under the action of cutting force, the corners are easy to drop slag, the periphery is not smooth, and the temperature rises quickly, if suddenly cooling, will make the mystery of the protective film burst. In the cutting process of tantalum and niobium, the chip sticks to the cutter seriously, and the phenomenon of gnawing and squeezing appears on the cutting surface. They are not suitable for intermittent cutting and long tight chip coiling, usually to make the chip into a ribbon and filamentous shape, which is different from the cutting of other metals, molybdenum and molybdenum alloy chips for the best shape C, which can make the axial resistance is reduced, under the pushing and mechanical vibration, will not suddenly this section and collapse. Molybdenum, tantalum, niobium and its alloy turning processing, should choose high-power machine tools, because their proportion is relatively large, so that the cutting force increases. The cutting speed should not be too high, but also can not choose too low, too low cutting speed, unfavorable to the selection of feed, full range cutting effect.

Cutting molybdenum, tantalum, niobium and its alloys, generally divided into coarse car, fine car two processing, that is, there should be two turning tools, so that the service life of fine turning tool can be extended, and greatly improve the work efficiency, but also without carbon tetroxide cooling, in the rough car with emulsion cooling can be.