Threading tap

An improved tap has a thread cutting portion over which there is a Titanium nitride coating. The Titanium nitride coating has a Rockwell C hardness of at least 70. The body portion of the tap underlying the Titanium nitride coating has a Rockwell C surface hardness of at least 65. This enables the b...

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Bibliographic Details
Main Author EMANUELLI; DINO J
Format Patent
LanguageEnglish
Published 24.11.1987
Edition4
Subjects
GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC
GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS
MACHINE TOOLS
METAL-WORKING NOT OTHERWISE PROVIDED FOR
PERFORMING OPERATIONS
TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
TECHNICAL SUBJECTS COVERED BY FORMER USPC
TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
THREAD CUTTING
TRANSPORTING
WORKING OF SCREWS, BOLT HEADS, OR NUTS, IN CONJUNCTIONTHEREWITH
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Summary:An improved tap has a thread cutting portion over which there is a Titanium nitride coating. The Titanium nitride coating has a Rockwell C hardness of at least 70. The body portion of the tap underlying the Titanium nitride coating has a Rockwell C surface hardness of at least 65. This enables the body portion of the tap to provide a rigid support for the Titanium nitride coating. Due to the interaction between the Titanium nitride coating, the relatively hard body portion of the tap, the number of flutes and the cutting face hook angle, the number of holes which can be tapped with a straight fluted tap is increased from 114 to 1,461. On a spiral pointed type tap having a relatively hard body portion interacting with the Titanium nitride, number of flutes and cutting face hook angle, the number of holes increases from 1,662 to 4,758.
Bibliography:Application Number: US19850724860