TAILIEUCHUNG - Cảm biến trong sản xuất P18

Several developments made high-speed cutting (HSC) possible. HSC became an important trend in machining (Figure ). The development of tool materials was a prerequisite to higher wear resistance under high temperatures. Up to the 1960s, the dualism of hardness and wear resistance on the one hand and toughness on the other were dominant limiting factors in tool materials. The functional separation of the ability to carry static and dynamic loads and of tribological functions was established by introducing coatings | 354 Sensors in Manufacturing. Edited by H. K. Tonshoff I. Inasaki Copyright 2001 Wiley-VCH Verlag GmbH ISBNs 3-527-29558-5 Hardcover 3-527-60002-7 Electronic High-speed Machining . Tönshoff Universität Hannover Hannover Germany Several developments made high-speed cutting HSC possible. HSC became an important trend in machining Figure . The development of tool materials was a prerequisite to higher wear resistance under high temperatures. Up to the 1960s the dualism of hardness and wear resistance on the one hand and toughness on the other were dominant limiting factors in tool materials. The functional separation of the ability to carry static and dynamic loads and of tribological functions was established by introducing coatings. The development of tougher ceramic materials for cutting purposes with their high-temperature strength was another way to withstand high cutting velocities. Finally the progress in synthesizing super-hard materials such as diamond diamond coatings and cubic boron nitride gave strong impulses from the process side for higher cutting speeds. Important preconditions had to be established on the machine tool side. High cutting speeds means high spindle rotational frequencies. The bearings of the main spindle had to be enabled to withstand the centrifugal forces increasing with the square of the rotational frequency to generate only small power losses and thus keep heat generation limited to be provided with sufficient dynamic stiffness in the domain of exciting frequencies and to avoid wear even under high thermal and dynamic loading. Progress has been made by introducing hybrid ball bearings where the bearing balls are made of ceramic with less mass and favorable tribological properties full ceramic bearings and active magnetic bearings. This means that the characteristic bearing number dm n dm average bearing diameter n spindle frequency could increase from X106 to X106 and 4 X 106mm min. tool coated carbide ceramic .

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