1103 Каталог WIDIA 2011 Инструментальная оснастка для металлорежущих станков Стр.K67

Каталог WIDIA 2011 Инструментальная оснастка Стр. K67 1103 ENG Lab2u

WIDIA 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 adapters, using greater insert density on milling cutters or increasing ADOC or WOC enables higher MRR. Better surface finishes and tool life can also be expected from these adjustments. The benefits of using WIDIA’s Tunable Systems go beyond increased metal removal rates. In metalcutting tests, a good correlation between dynamic stiffness and vibration levels were measured at the spindle. Vibrations can not only cause premature tool life, but also limit spindle bearing life. Preventing vibration from propagating through the machine promotes longer life for spindle-related components and maintains machine accuracy over time. Surface Finish (Ra) vs. Feed Rate feed (IPM) A WIDIA Competitor Dynamic Stiffness Figure 1 shows the relative dynamic stiffness of a tunable boring bar as a function of adjusting screw tightness loose to tightened (left to right). The chart shows that for the given bar, optimal tuning occurs at about 70% or when the relative performance equals 1. It is also important to note that performance decreases more severely when the tool is over-tuned, compared to when it is under-tuned. For this reason, it is best to slightly under-tune the system. 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. Normalized Dynamic Stiffness number of turns Fig. 1 Dynamic Stiffness of Damped Milling Adapters .00 0.34 75 0.53 i i-Tl 0.32 lh machine A machine B Competitor WIDIA Standard (pre-tuned) (tunable) Toolholder WIDIA K67 Technical Information