Каталог Widia инструментальная оснастка - страница 1103

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 45 40 35 30 25 20 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 0.34 0.40 0.32 0.25 0.20 0.00 machine A machine B