Общий каталог Palbit - страница 209

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turningInsert selectionOverviewNegative insertsPositive insertsPCD insertsHeavy machiningExternal ToolholdersInternal ToolholdersAutomatic LathesSpare PartsTechnical Data turningInsert selectionOverviewNegative insertsPositive insertsPCD insertsHeavy machiningExternal ToolholdersInternal ToolholdersAutomatic LathesSpare PartsTechnical Data geometry selection edge preparation selection PCD RANGE 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. and productivity. Its choice is mainly required in order to achieve the best economical result. Insert nose radius is an important performance parameter: • For good chip breaking, must be used a small nose radius: 0,2-0,4mm (0,008-0,016inch); Edge preparation: • 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 In general, a large nose radius provides greater edge strength and therefore extended tool life. For this reason, it is Cutting forces - Sharp cutting edge; 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. Finishing and semi-finishing: - In these cases, there are special requirements on the surface and tolerances. Note: 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 order to calculate the minimum radius vs feed: Insert shape Formula Radius >1,6 x feed per rev. Radius >2,5 x feed per rev. C - 414 C- 415