Mult- purpose end-mill

Abstract

A multi-purpose end-mill to be used for different machining purposes, in particularly useful for closed or open contours machining. The end-mill comprises a cylindrical shank portion connected to a first cutting portion provided with a plurality of spaced-apart cutting teeth and a second portion provided with a plurality of different spaced-apart cutting teeth.

1 . A multi-purpose end-mill particularly useful for closed contour machining and usable for at least rough machining and finish machining, comprising a cylindrical shank portion to be gripped in a machine tool, said shank portion being connected to a first cutting portion comprising a core supporting a plurality of spaced-apart cutting teeth for a first type of machining, said first cutting portion being connected to a second cutting portion provided with a plurality of spaced-apart cutting teeth for a second type of machining.  
   
   
       2 . The multi-purpose end-mill as claimed in  claim 1 , wherein said first type of machining is finishing, and said second type of machining is roughing.  
   
   
       3 . The multi-purpose end-mill as claimed in  claim 2 , wherein said finishing portion has a larger number of teeth than said roughing portion.  
   
   
       4 . The multi-purpose end-mill as claimed in  claim 2 , wherein said finishing portion has double the number of teeth than said roughing portion.  
   
   
       5 . The multi-purpose end-mill as claimed in  claim 2 , wherein said finishing portion has a smaller helix angle than said roughing portion.  
   
   
       6 . The multi-purpose end-mill as claimed in  claim 1 , wherein the core diameter of said end-mill varies along the axial length parabolically, the larger diameter being located near the shank and the smaller diameter being located near the tool tip.  
   
   
       7 . The multi-purpose end-mill as claimed in  claim 1 , further provided with a drill-like pointed cutting tip.  
   
   
       8 . The multi-purpose end-mill as claimed in  claim 7 , wherein the number of cutting teeth at said pointed cutting tip corresponds to the number of teeth in said second cutting portion.