551 Каталог SUMITOMO 2015 Режущий инструмент и инструментальная оснастка Стр.547

Каталог SUMITOMO 2015 Инструмент и оснастка Стр. 547 0551 ENG Lab2u

Technical Guidance TECHNICAL GUIDANCE T ool Failure & T ool Life Forms of Tool Failures Cat. No. Name of Failure Cause of Failure O ro “ nro X 2 cc (1) to (5) (6) (7) Flank Wear Chipping Fracture Due to the scratching effect of hard grains contained in the work material. Fine breakages caused by high cutting loads or chattering. Due to the impact of an excessive mechanical force acting on the cutting edge. Resulting from Chemical Reactions (8) (9) (10) (11) Crater Wear Plastic Deformation Thermal Crack Built-up Edge Swaft chips removing tool material as it flow over the top face at high temperatures. Cutting edge is depressed due to softening at high temperatures. Fatigue from rapid, repeated heating and cooling cycles during machining. Work material is pressure welded on the top face of the cutting edge. Tool Wear Forms of Tool Wear Poor machining accuracy, Burrs occur Flank Wear Wear is rapid initially, then it proceeds more gradually in proportion with cutting time until a certain limit, beyond which it increases rapidly again. Crater Wear Cutting Time T (min) Crater wear is more progressive with no sudden breakdown pattern. Tool Life (V-T) 547 Technical Guidance