422 Каталог ISCAR 2017 Токарный металлорежущий инструмент и инструментальная оснастка Стр.418

Каталог ISCAR 2017 Токарный инструмент и оснастка Стр. 418 0422 ENG Lab2u

PARTING USER GUIDE PARTING Parting and Grooving Selection of Inserts For a proper match of insert and cutting material to application, the following variables must be taken into consideration: Width of cut (width of insert) Chipformer style Lead angle Corner radius Carbide grade Width of Cut (W.O.C.) and Depth of Cut (D.O.C.) In selecting W.O.C., the main factor to consider is the required D.O.C. The ratio D.O.C. 8xW.O.C. is of practical use on alloy steel of average machinability. For example, applying a 3 mm W.O.C. insert TAG N3C to cut-off a 48 mm solid bar. Additional factors which affect D.O.C. capacity, relative to the ratio, are: Holder or Blade Size To minimize risk of vibration and deflection always choose: Blade or toolholder with smallest possible overhang. Toolholder with maximum shank dimension. Blade height (B) dimension which is larger than Tmax. Blade or holder with maximum blade width (largest possible insert seat size). Example: A W.O.C. 9.5 mm on blade TGFH 53K-9 (B=52.6 mm) extends the ratio of D.O.C. to W.O.C. by some 50% to 120 mm. Insert Support A self-clamped tool is recommended for deep radial machining. A screw-clamp holder is recommended for axial and small D.O.C. machining. 90° Mounting It is very important that the insert is mounted at 90° to the center line of the workpiece in order to obtain perpendicular surfaces and reduce the risk of vibration. Workpiece Machinability The workpiece material affects all of the above factors. Machine Power and Setup Rigidity Excessive W.O.C. on a light-duty machine will yield vibration and may even stop spindle rotation. Expensive Workpiece Material On costly metals the narrowest applicable W.O.C. should be used. Insert Positioning The Twisted Insert for Cut-Off and Grooving Applications Machining depths longer than insert length is made possible with the double-ended, twisted insert body. The rear edge is slanted in relation to the frontal edge so it does not come into contact with the machined groove surface when the tool penetrates deeply into the workpiece. Clamping Extended, prismatic surfaces guarantee reliable, foolproof clamping even in unstable machining conditions. Screw-Clamping Small diameters (D.O.C.) with screw-clamped Inserts Self-Clamping Large diameters (D.O.C.) with self-clamped Inserts It 418 ISCAR