Модульные инструментальные системы линейки KM4X Kennametal 2017 - страница 132

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Technical Manual Frequently Asked Questions (7. Frequently Asked Questions — continued) How many tool changes can be done until the ball track or the tool taper gets worn by the pressure and the friction? In a typical setup, the springs of the drawbar will fatigue before wear or fatigue becomes an issue for the clamping components. KM4X™ has been tested with a clamping force over 15% of the maximum force. A life of about 1 million cycles was achieved without changing the tool or using grease. Technical Manual The following are results from an independent cyclic test of KM4X100: 140.00 120.00 Pull-in-force with OTT-JAKOB clamping unit 100.00 Force [kN] Nominal pull-in-force KM4X100 80.00 60,00 100000 200000 300000 400000 500000 600000 700000 0 Strokes Why is the stiffness of KM4X™ higher in comparison to HSK? The rigidity of the KM4X™ system is about 2.5 times higher than that of HSK. This is achieved by higher interference, higher clamping force, and the overall distribution of the interference zones. On KM4X™ and KMTS™, the taper interference zones are split into two areas, providing better support. HSK appears to have a larger taper contact zone, but the contact happens on a much shorter taper. The keys on the spindle often force MTBs to use a design with clearance in the back of the HSK taper. This not only reduces the stiffness but also causes higher stresses internally on the taper in the corner where the fingers pull. HSK tapers can break off completely in that location during heavy duty applications. (continued) C32 kennametal.com L V i KMT_KM4X_Catalog_C032_C033_EN.indd KMT 32 KM4X C l C032 C033 EN A 31 2016 5 44 PM 9/1/16 2:02 PM