Каталог Widia инструментальная оснастка - страница 1103

• WID_TOOLINGSYSTEMS10_G004_G005.qxp.pdf
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• WID_TOOLINGSYSTEMS10_G008_G009.qxp
• WID_TOOLINGSYSTEMS10_G010_G011.qxp

surface finish Ra (uin)dynamic stiffness (normalized) Technical Information Technical Information Tunable Tooling System (TTS) Tunable Tooling System (TTS) (continued) With the WIDIA™ TTS System, longer L:D ratio toolholders can be used for larger DOC, better surface finishes, and longer tool life. When TTS is applied to milling Surface Finish (Ra) vs. Feed Rate adapters, using greater insert density on milling cutters or increasing ADOC or WOC 45 enables higher MRR. Better surface finishes and tool life can also be expected from these adjustments. 40 35 The benefits of using WIDIA’s Tunable Systems go beyond increased metal removal 30 rates. In metalcutting tests, a good correlation between dynamic stiffness and 25 vibration levels were measured at the spindle. Vibrations can not only cause premature tool life, but also limit spindle bearing life. Preventing vibration from 20 propagating through the machine promotes longer life for spindle-related components and maintains machine accuracy over time. 15 40 50 60 70 80 90 feed (IPM) WIDIA Competitor Surface finish measurements comparing a pretuned milling adapter from a competitor and a WIDIA’s optimally tuned adapter on the spindle. An increase of up to 50% in feed rate for similar surface finish values can be noticed. Dynamic Stiffness Figure 1 shows the relative dynamic stiffness of a tunable boring bar as a function Normalized Dynamic Stiffness of adjusting screw tightness — loose to tightened (left to right). 1.20 1.00 The chart shows that for the given bar, optimal tuning occurs at about 70% or when the relative performance equals 1. 0.80 0.60 It is also important to note that performance decreases more severely when the 0.40 tool is over-tuned, compared to when it is under-tuned. For this reason, it is best to slightly under-tune the system. 0.20 0.00 0 1 2 3 4 5 6 7 8 9 number of turns Fig. 1 Dynamic Stiffness of Damped Milling Adapters 1.20 1.00 1.00 0.80 0.75 0.60 0.53 0.40 0.34 0.32 0.25 0.20 0.00 machine A machine B Competitor WIDIA Standard (pre-tuned) (tunable) Toolholder WWW.WIDIA.COM K67