348 Каталог ISCAR 2017 Токарный металлорежущий инструмент и инструментальная оснастка Стр.344

Каталог ISCAR 2017 Токарный инструмент и оснастка Стр. 344 0348 ENG Lab2u

GROOVE-TURN USER GUIDE GROOVETURN Machining Tips Insert Width Generally, the insert width should be as wide as possible as it contributes to its strength. However, there are additional considerations that should be taken into account in order to choose the correct width: Workpiece size and clamping stability: A larger width means higher cutting forces during grooving. A width that is too large can cause deformation of the workpiece and/or vibration. When using a larger width, make sure your machine has enough power. (see page 349) Machining strategy: Grooving in a correct sequence should also affect your choice. (see page 345) Required overhang: A larger tool overhang will require a wider insert to maintain stability. The larger the insert, the wider the upper and lower jaws can be, therefore, higher forces are required to effect the necessary side deflection. If the depth of cut is small, the width of the insert should be proportionately smaller to guarantee the required deflection. Efficient use of insert’s corners: Always try to evenly split machining between the two corners. This optimization will increase the insert’s life. Insert Radius Choosing the insert radius for a particular application is a combination of many factors. The corner radius of the groove-turn insert influences the product shape and tool life. A larger radius in turning operations normally improves surface quality. An insert with a larger radius has a better distribution of the cutting load and of the generated heat. It is stronger and ensures longer tool life. Small radii on grip inserts result in increased side forces and side deflection, preventing instability, especially with small depths of cut and feed. The best radius to use is basically determined by the geometry and dimensions of the workpiece. The more securely the workpiece is fastened in the machine tool, the larger the radius may be. When the ratio of a workpiece’s length compared to its diameter is large, inserts with smaller radii will prevent chatter. A larger corner radius enables machining at a larger feed rate. In profiling operations, inserts with larger corner radii or full radii are required. 344 ISCAR