Общий каталог Ingersoll 2011 - страница 311

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Cutter Diameter Cutter Diameter RADIAL CHIP THINNING Fig. 3: Radial Chip Thinning Factors for Peripheral Milling Depth of Cut .01 .02 .03 .04 .05 .06 .08 0.1 .15 0.2 0.3 0.4 0.6 0.8 1 2 3 4 5 6 7 8 10 12 15 30 30 25 25 .05 .06 .08 .1 .12 20 20 18 18 16 16 14 14 12 12 10 10 9 9 8 8 7 7 6 6 5 5 4 4 3 3 .14 .16 .18 .2 .25 .3 .4 .5 .6 .7 .8 .9 .95 1.0 2 2 1.8 1.8 1.6 1.6 1.4 1.4 1.2 1.2 1 1 .9 .9 .8 .8 .7 .7 .6 .6 .5 .5 .4 .4 .3 .3 .2 .2 .1 .1 .01 .02 .03 .04 .05 .06 .08 0.1 .15 0.2 0.3 0.4 0.6 0.8 1 2 3 4 5 6 78 10 12 15 Depth of Cut To find the Radial Chip Thinning Factor for a slabbing cut: 1. Find the Depth of Cut on the horizontal scale. 2. Locate the nominal diameter of the cutter on the vertical axis. 3. Cross-reference the two figures. 4. Locate the diagonal line closest to the intersection of the vertical and horizontal axes. The value of this diagonal is the Radial Chip Thinning Factor for your specific application. The RCTF can also be found with the help of the Again, referring to the example, the chip load graph in Figure 3. of .005” is divided by the RCTF of .48 to arrive at the optimum APT of .0105”. This APT should A thorough understanding of the relationship be used in calculating the feed rate, in this between APT and chip thickness enables the case, 20.1 IPM. tool engineer to establish optimum feed rates for a cutting tool. After determining the RCTF, In addition to increasing productivity, applying the maximum permissible chip load is divided the RCTF can improve a cutter’s performance. by the RCTF to arrive at the optimum APT. At the higher feed rate, the insert will be taking a true bite. At lower feed rates without applying the RCTF, the insert may rub instead of cut and produce chatter, building heat and compromising tool life. 313