Title:
コーテッド超硬タップ
Document Type and Number:
Japanese Patent JP2006519114
Kind Code:
A
Abstract:
A coated carbide tap comprises a substrate consisting of tungsten carbide cemented with 12 to 16% by weight cobalt with additions of small amounts of transition metal carbides added to restrain grain growth, and may also contain low levels of impurities that might be picked up during processing. The substrate is coated with a layer of metal nitrides, carbides, carbonitrides, borides and/or oxides, the metal being chosen from one or more of the following: aluminum, silicon and the transition metals from Groups IVa, Va, and VIa of the Periodic Chart. The coating may comprise a monolayer and/or alternating layers optionally with varying chemical composition. To reduce friction, a top outer layer comprised of molybdenum disulphide; molybdenum disulphide and transition metals, or any combination thereof; carbon; carbon and transition metal carbides, or any combination thereof; carbon and a transition metal, or any combination thereof; and/or carbon nitride may be either co-deposited as a single layer or deposited in multiple or alternating layers to the coating. The coated carbide tap of the invention can be used at cutting speeds at least three times faster than conventional taps without chipping or breaking the tap.
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Inventors:
Henderer, Willard, Yi.
Sadayuki Akagi
Santanum, Anaca, Tea.
Sadayuki Akagi
Santanum, Anaca, Tea.
Application Number:
JP2006503669A
Publication Date:
August 24, 2006
Filing Date:
February 18, 2004
Export Citation:
Assignee:
Kennametal Inc.
International Classes:
B23G5/06; B22F9/00; B23B51/00; B23D77/00; B23P15/52; B27G15/00; B32B9/00; B32B9/04; B32B15/01; B32B15/04; B32B18/00; B32B19/00; C22C5/00; C22C29/00; C23C30/00
Attorney, Agent or Firm:
Atsushi Nakajima
Kato Kazunori
Katsuichi Nishimoto
Kato Kazunori
Katsuichi Nishimoto