17 Каталог WIDIA 2011 Инструментальная оснастка для металлорежущих станков Стр.A7

Каталог WIDIA 2011 Инструментальная оснастка Стр. A7 0017 ENG Lab2u

WIDIA KM Quick Change KM4X Features and Benefits Figure 1 Choosing What’s Right When machining tough materials like titanium, cutting speeds are relatively low due to thermal effects on cutting tools. In response, machine tool builders have improved stiffness and damping on spindles and machine structures over the years. Spindles have been designed with abundant torque at low rotational speeds. Nevertheless, the spindle connection remains the weak link in the system. The spindle connection must provide torque and bending capacity compatible with the machine tool specifications and the requirements for higher productivity. It becomes obvious that in end-milling applications where the projection lengths are typically greater, the limiting factor is bending capacity of the spindle interface. With more materials that are tougher to machine and require considerably higher cutting forces from the machine tool, choosing wisely on the spindle interface to maximize cutting edge performance is the key to success. The KM spindle connections greatly outperform the conventional 7/24 steep taper and its face taper contact derivative, HSK and PSC systems with their greater stiffness advantages to help minimize undesirable vibrations, gaining the best possible productivity from the machine tool. The KM4X is the best large, heavy-duty spindle connection, where optimal rigidity is necessary. It has superb balance between bending and torsion capabilities from the machine tool. 1= 0.20 8 8 R 8 ( ) e o o o O o O 1 o jgt \jir A A A a < A 1000 2000 3000 4000 bending moment (Nm) 5000 6000 As an example, an indexable helical cutter with 250mm projection from spindle face and 80mm in diameter generates 4620 Nm of bending moment and less than 900 Nm of torque. 150mm Deflection Chart shows a comparison of Steep Taper with and without face contact, HSK, and KM4X. 7/24 Taper Size 50 with Face Contact o 7/24 Taper Size 60 HSK125A L. KM4X125 o 7/24 Taper Size 50 HSK100A A KM4X100 WIDIA A7 0