Общий каталог Palbit - страница 129

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MILLINGOverviewFace millingHifeed millingShoulder millingProfile millingHardmillCenter & ChamferSpot faceEnd MillsSpare partsTechnical Data Work Material MILLINGOverviewFace millingHifeed millingShoulder millingProfile millingHardmillCenter & ChamferSpot faceEnd MillsSpare partsTechnical Data technical data Dados técnicos | Datos técnicos A A Coarse Pitch Type Normal Pitch Type Fine Pitch Type Choosing Cutter Diameter First choice for cutting aluminium First choice for roughing in stable conditions. First choice for cast iron. (long-chipping material - ISO N). Good productivity. First choice for high productivity with low width First choice for unstable operations due to Good chip space for roughing in steels, stainless of cut (Ae). The Best Cutter Diameter (ØDc) should belowest cutting forces.steel and super alloys.Roughing in super alloys materials inSmoth cutting allows longer overhangFirst choice for shallow cutting with low feedcombination with round inserts.selected upon the workpiece dimensionsøDc applications. rates. For cutting operations where chip dischange F ae First choice for deep cutting and high feedrates. volume is small and high table feed is desired. Dc = 1,3 - 1,5 ae If the machine power is limited or the workpiece is too wide, select a cutter diameter that takes more than two passes or that matches the power of machine. øDc When the appropriate cutter diameter isnot available, proper cutter position willae give good results. F ae = 3/4 Dc Standard inserts Cutter Position Positive and Negative Rake Angle - Insert shape whose cutting edge precedes is a positive rake angle. - Insert shape whose cutting edge follows is a negative rake angle. Conventional Milling (Up Milling) The feed direction of the workpiece is opposite to that of cutter Negative (-) Neutral Positive rotation. The chip thickness starts at zero and increases to the Rake Angle Rake Angle Rake Angle maximum at the end of cut. In Up Milling, the insert wear is severe with excessive friction and high temperature caused by the Standard Cutting Edge Shape (+) Axial Rake Angle (-) Axial Rake Angle (+) Axial Rake Angle rubbing or burnishing effect in the insert. Channel Milling (Up and Down Milling) Standard CuttingEdge Combinations Radial Rake Angle Radial Rake Angle Radial Rake Angle The cutter position is in the middle of the workpiece and thecutting force is alternately changed in the radial direction. It (+) (-) (-) causes vibration when the spindle structure is weak. Channel Milling is a combination of conventional and climb milling. When Double Positive Double Negative Negative / Positive Channel Milling is necessary use positive geometry cutters at (DP Edge Type) (DN Edge Type) (NP Edge Type) reduced speeds and feeds with coolant. Axial Rake Angle p Positive (+) Negative (-) Positive (+) Radial Rake Angle f Positive (+) Negative (-) Negative (-) Insert Used Positive Insert (One Sided Use) Negative Insert (Double Sided Use) Positive Insert (One Sided Use) Steel -Cast Iron- Climb Milling (Down Milling)Climb Milling is normally recommended.The feed direction of workpiece is the same as that of cutter Aluminium Alloy - - rotation. So the chip thickness starts from the maximum and Hardened Materials - decreases to zero at the end of cut. The tool life is long with less heat and minimum work hardening of workpiece. A - 254 A - 255