1775 Каталог MITSUBISHI 2020 Режущий инструмент Фрезы Резцы Сверла Пластины Стр.R023

Каталог MITSUBISHI 2020 Режущий инструмент для станков Стр. R023 1775 Lab2u

APPROACH ANGLE AND THE TOOL LIFE Approach Angle and Chip Thickness When the depth of cut and feed per tooth, fz, are fixed, the smaller the lead angle (KAPR) is, then the thinner the chip thickness (h) becomes (for a 45° KAPR, it is approx. 75% that of a 90° KAPR). This can be seen in below. Therefore as the KAPR increases, the cutting resistance decreases resulting in longer tool life. Note however, if the chip thickness is too large then the cutting resistance can increase leading to vibrations and shortened tool life. Effects on chip thickness due to the variation of lead angles Approach Angle and Face Wear Below shows wear patterns for different lead angles. When comparing crater wear for 90° and 45° lead angles, it can be clearly seen that the ctater wear for 90° lead angle is larger. Lead Angle 90° Lead Angle 45° Workpiece: SNCM439 287HB Tools: DC=125mm Insert: M20Cemented Carbide Cutting Conditions: ap=3.0mm ae=110mm fz=0.2mm/t. Dry Cutting UP AND DOWN CUT (CLIMB) MILLING When choosing a method to machine, up cutting or down cut milling (climb milling) is decided by the conditions of the machine tool, the milling cutter and the application. However, it is said that in terms of tool life, down cut (climb) milling is more advantageous. Up Cut Down Cut Tool rotation Milling cutter inserts Portion machined Portion machined Too, rotation Milling cutter inserts R R023 TECHNICAL DATA