文档介绍：A 50 B C D E F G A H 60° 22° κ r 93° Parting and grooving Threading Milling Drilling Boring Tool holding Turning Machinability Other inf ormation Choice of tools – external turning Tool selection and how to apply External turning Definitions of key figures ? Secure insert and tool holder clamping is an essential factor for stability in turning. ? Tool holder types are defined by the entering angle, the shape and size of the insert used. ? The selection of tool holder system is mainly based on the type of operation. ? Another important selection is the use of negative versus positive inserts. ? Whenever possible choose modular tools. Entering angle Max in copy angle Feed directions Insert shape Insert point angle General guidelines A 51 B C D E F G A H Parting and grooving Threading Milling Drilling Boring Tool holding Turning Machinability Other information Choice of tools – external turning Four main application areas Longitudinal turning/facing Facing Profiling Plunging The mon turning operation. ? Rhombic shape C-style (80°) insert is frequently used. ? Holders with entering angle of 95° and 93° monly used. ? Alternatives to the C-style insert are D-style (55°), W-style (80°) and T-style (60°). Versatility and accessibility is the determining factor. ? The effective entering angle ( κ r ) should be considered for satisfactory machining. ? monly used entering angle is 93° because it allows an in-copying angles between 22-27°. ? The most frequently used insert shapes are D-style (55°), V-style (35°) and T-style (60°) inserts. The tool is fed in towards the centre. ? Pay attention to the cutting speed which will change progres - sively when feeding towards the centre. ? Entering angle of 75° and 95°/91° monly used. ? C-style (80°), S-style (90°), and T-style (60°) inserts are fre - quently used. A method to produce or widening shallow grooves. ? Round inserts are very suitable for plunge turning as they can be used for both radial and axial feeds.