Threading tap for cutting threads in blind holes and methods of its manufacture
AssigneeSandvik Intellectual Property AB
InventorsGiovanna Malagnino, Roberto Troilo
Life of this patent
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Abstract
A threading tap for cutting threads in blind holes includes an elongated body with a central axis, the body having at a rear end a connector portion, and having at a front end a threading portion. The threading portion is provided with at least one helical thread-cutting structure and interconnected flank portions defining at least one helical flute which interrupts the helical thread cutting structure. The flank portions present exposed surfaces that are steam tempered. The rest of the tap is coated by PVD.
Claims14
A threading tap for cutting threads in blind holes, comprising an elongated body defining an axis of rotation and including axial front and rear end regions, the front end region including a threading portion having teeth defining a helical thread-cutting structure, and at least one helical flute formed in an outer periphery of the body and interrupting the thread-cutting structure, the threaded portion being coated with a PVD coating and the at least one flute comprising interconnected flanks having exposed surfaces that are steam tempered but not coated with the said PVD coating.
A method of manufacturing a threading tap suitable for cutting threads in blind holes, including the following steps:
- A) selecting a blank comprising an elongated body defining an axis of rotation and including axial front and rear regions;
- B) forming at least one helical flute in an outer periphery of the body, the at least one flute comprising interconnected flanks having exposed surfaces;
- and
- C) steam tempering only the exposed surfaces of the flute.
A method of manufacturing a threading tap suitable for cutting threads in blind holes, including the following steps:
- A) selecting a blank comprising an elongated body defining an axis of rotation and including axial front and rear regions;
- B) forming at least one helical flute in an outer periphery of the body, the at least one flute comprising interconnected flanks having exposed surfaces;
- C) forming a threading portion including threads and teeth;
- D) coating the said threads and teeth with a PVD coating;
- and
- E) steam tempering the exposed surfaces of the flute.
A method of manufacturing a threading tap suitable for cutting threads in blind holes, including the following steps:
- A) selecting a blank comprising an elongated body defining an axis of rotation and including axial front and rear regions;
- B) forming at least one helical flute in an outer periphery of the body, the at least one flute comprising interconnected flanks having exposed surfaces;
- C) forming a threading portion including threads and teeth;
- D) coating the said threads with a PVD coating;
- and
- E) steam tempering the exposed surfaces of the flute, wherein the steam tempering is performed at a temperature between 500° C. and 540° C.
A method of manufacturing a threading tap suitable for cutting threads in blind holes, including the following steps:
- A) selecting a blank comprising an elongated body defining an axis of rotation and including axial front and rear regions;
- B) forming at least one helical flute in an outer periphery of the body, the at least one flute comprising interconnected flanks having exposed surfaces;
- C) forming a threading portion including threads and teeth;
- D) coating the said threads with a PVD coating;
- and
- E) steam tempering the exposed surfaces of the flute, wherein the steam tempering is performed with nitrogen (N2) and carbon dioxide (CO2).
A method of manufacturing a threading tap suitable for cutting threads in blind holes, including the following steps:
- A) selecting a blank comprising an elongated body defining an axis of rotation and including axial front and rear regions;
- B) forming at least one helical flute in an outer periphery of the body, the at least one flute comprising interconnected flanks having exposed surfaces;
- C) forming a threading portion including threads and teeth;
- D) coating the said threads with a PVD coating;
- and
- E) steam tempering the exposed surfaces of the flute, wherein the steam tempering is performed with nitrogen (N2) and water steam (H2O).
Dependencies are inferred from the claim text.