311 Каталог INGERSOLL 2011 Режущий инструмент и инструментальная оснастка Стр.313

Каталог INGERSOLL 2011 Инструмент и оснастка Стр. 313 0311 Lab2u

RADIAL CHIP THINNING Fig. 3: Radial Chip Thinning Factors for Peripheral Milling Depth of Cut .03 .04 .05 .06 .08 0.1 4 5 6 7 8 10 12 15 D re Z z z z ra IZ LJ z z z z IZ .1 .01 .02 .03 .04 .05 .06 .08 0.1 .15 0.2 0.3 0.4 0.6 0.8 1 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. z z z 4 5 6 7 8 10 12 15 The RCTF can also be found with the help of the graph in Figure 3. A thorough understanding of the relationship between APT and chip thickness enables the tool engineer to establish optimum feed rates for a cutting tool. After determining the RCTF the maximum permissible chip load is divided by the RCTF to arrive at the optimum APT. Again referring to the example the chip load of .005 is divided by the RCTF of .48 to arrive at the optimum APT of .0105. This APT should be used in calculating the feed rate in this case 20.1 IPM. In addition to increasing productivity applying the RCTF can improve a cutter's performance. 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. 0.6 0.8 1 2 3 4 4 3 3 4 4 3 3 2 2 2 3 313 Cutter Diameter