Общий каталог Palbit - страница 209

geometry selection edge preparation selection PCD
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C Selecção da geometria | Selección de la geometria Selecção da preparação de aresta | Selección de la preparación de arista C

The insert geometry and nose radius are very important on turning operation having direct influence on the tool life The most important criteria for the stability and cutting edge tool-life is to define the correct cutting edge preparation.
turning


turning
and productivity. Its choice is mainly required in order to achieve the best economical result.
Insert nose radius is an important performance parameter:
Edge preparation:
• For good chip breaking, must be used a small nose radius: 0,2-0,4mm (0,008-0,016inch);
Insert selection


Insert selection
• A large nose radius: 0,8-1,2mm (0,031-0,047inch) generates better surface finishing and produces thinner chips, which PCD: F type cutting edge preparation:
reduces the degree of crater wear in hard part turning operations +
• The machining with large nose radius and small depth of cut results in reduced entry and exit forces..
F – Standard preparation without honing - Standard
Overview


Overview
In general, a large nose radius provides greater edge strength and therefore extended tool life. For this reason, it is - Sharp cutting edge;
Cutting forces
advised to use the largest and allowed nose radius based on each process requirements. Edge strength - Standard and recommended edge preparation for
aluminium or other non-ferrous materials.
Negative inserts


Negative inserts
Finishing and semi-finishing:
-
Note:
In these cases, there are special requirements on the surface and tolerances.
Positive inserts


Positive inserts
Based on our experience sometimes is necessary to define edge preparation during several tests to provide the best possible solution for each application.

Roughing:
For the evaluation of the cutting edge radius in roughing operation it is recommended to use the following formula in
PCD inserts


PCD inserts
order to calculate the minimum radius vs feed:

Insert shape Formula
Heavy machining


Heavy machining
Radius >1,6 x feed per rev.
External Toolholders


External Toolholders
Radius >2,5 x feed per rev.
Internal Toolholders


Internal Toolholders
Automatic Lathes


Automatic Lathes
Spare Parts


Spare Parts
Technical Data


Technical Data
C - 414 C- 415