Drilling and threading tool

A drilling and thread-milling tool for generating an internal thread in a workpiece, comprising:

• a proximal shank portion attachable to driving means for rotating the tool about a rotation axis thereof;
• a distal cutting portion rotated with said shank portion about said rotation axis for generating said internal thread while said distal cutting portion is moved relative to said workpiece;
• at least one cutting insert fixed on said distal cutting portion, and each of said at least one cutting insert including at least two thread-milling teeth which protrude from an outer circumferential surface of said distal cutting portion, each of said at least two thread-milling teeth having a configuration corresponding to that of said internal thread, and having a height substantially equal to a depth of said internal thread,
• said each cutting insert further including an end-cutting edge at a distal end of said distal cutting portion, said end-cutting edge extending in a radial direction of said distal cutting portion and being contiguous with said at least two thread-milling teeth, said end-cutting edge having a maximum diameter which is larger than a minor diameter of said at least two thread-milling teeth and smaller than a major diameter of said at least two thread-milling teeth;
• and
• fixing means for fixing said at least two cutting inserts to said distal cutting portion.

A drilling and thread-milling tool for generating an internal thread in a workpiece, comprising:

• a proximal shank portion attachable to driving means for rotating the tool about a rotation axis thereof;
• and
• a distal cutting portion rotated with said shank portion about said rotation axis for generating said internal thread while said distal cutting portion is moved relative to said workpiece,
• said distal cutting portion having at least one thread-milling tooth integrally formed on an outer circumferential surface thereof, each of said at least one thread-milling tooth having a configuration corresponding to that of said internal thread, and having a height substantially equal to a depth of said internal thread,
• said distal cutting portion further having at least one end-cutting edge integrally formed on a distal end face thereof such that said at least one end-cutting edge is contiguous with said at least one thread-milling tooth and extends in a radial direction thereof, each of said at least one end-cutting edge having a maximum diameter which is larger than a minor diameter of said at least one thread-milling tooth and is smaller than a major diameter of said at least one thread-milling tooth,
• said at least one end-cutting edge including at least one end-cutting edge whose inner end is located close to said rotation axis.

A drilling and thread-milling tool for generating an internal thread in a workpiece, comprising:

• a proximal shank portion attachable to driving means for rotating the tool about a rotation axis thereof;
• and
• a distal cutting portion rotated with said shank portion about said rotation axis for generating said internal thread while said distal cutting portion is moved relative to said workpiece,
• said distal cutting portion having a plurality of thread-milling teeth which are integrally formed on an outer circumferential surface thereof and which are equally spaced apart from each other in an axial direction of the tool, each of said plurality of thread-milling teeth having a configuration corresponding to that of said internal thread, and having a height substantially equal to a depth of said internal thread,
• said distal cutting portion further having at least one end-cutting edge integrally formed on a distal end face thereof such that said at least one end-cutting edge is contiguous with said plurality of thread-milling teeth and extends in a radial direction thereof, each of said at least one end-cutting edge having a maximum diameter which is larger than a minor diameter of said at least one thread-milling tooth and is smaller than a major diameter of said at least one thread-milling tooth.

A drilling and thread-milling tool for generating an internal thread in a workpiece, comprising:

• a proximal shank portion attachable to driving means for rotating the tool about a rotation axis thereof;
• and
• a distal cutting portion rotated with said shank portion about said rotation axis for generating said internal thread while said distal cutting portion is moved relative to said workpiece,
• said distal cutting portion having a plurality of thread-milling teeth which are integrally formed on an outer circumferential surface thereof and which are equally spaced apart from each other in an axial direction of the tool, each of said plurality of thread-milling teeth having a configuration corresponding to that of said internal thread, and having a height substantially equal to a depth of said internal thread,
• said distal cutting portion further having at least one end-cutting edge integrally formed on a distal end face thereof so as to extend in a radial direction thereof, each of said at least one end-cutting edge having a maximum diameter which is larger than a minor diameter of said plurality of thread-milling teeth and is smaller than a major diameter of said thread-milling teeth,
• said distal cutting portion further having at least one peripheral cutting edge extending in a direction substantially parallel to an axial direction of the tool, said at least one peripheral cutting edge being contiguous with one of said plurality of thread-milling teeth which is closest to said distal end face of said distal cutting portion in said axial direction, said at least one end-cutting edge being contiguous with said at least one peripheral cutting edge.