Threading tap

Details Threading tap Threading tap

1994-09-07

1996-01-30

Bishop, Steven C.

Cutting by use of rotating axially moving tool

Tool of specific diverse material

408222, 470198, B23G 506

Patent

active

054876265

ABSTRACT:
A threading tap comprises a cylindrical shaft and a threading portion. At least the threading portion comprises a compound material comprising a core of high speed steel or tool steel and a cover of "Coronite".RTM., i.e., a hard material with 30 to 70% by volume of submicronic hard materials in the form of carbides, nitrides and/or carbonitrides of Ti, Zr, Hf, V, Nb, Ta, Cr, Mo and/or W in a metallic matrix based on Fe, Co and/or Ni. The chip surfaces adjacent to the cutting edges of the cutting threads have a negative rake angle. The threading tap has proven to be excellent at the threading of titanium-based alloys.

REFERENCES:
patent: 2240840 (1941-05-01), Fischer
patent: 2351827 (1944-06-01), McAllister
patent: 3328814 (1967-07-01), Hudson
patent: 4145213 (1979-03-01), Oskarsson et al.
patent: 4618540 (1986-10-01), Von Holst et al.
patent: 4708542 (1987-11-01), Emanuelli
VDI Zeitschrift, vol. 215, Sep. 1993, Dusseldorf DE, p. 28, XP392754, "Hochgeschwindigkeits-Gewindebohren".
Tooling and Production, vol. 51, No. 10, Jan. 1985, Solon US, "No Holes Barred".
Werkstatt und Betrieb, vol. 117, No. 5., May 1984, Munchen DE, pp. 273-276, Woska, "Einsatz titannitrid-beschichteter Gewindebohrer".

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