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2 results about "Twist drill" patented technology

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The twist drill is the most widely used and widely produced kind of drill bit. The term twist drill generally refers to the kind of drill bit used, not to the drill itself. A twist drill bit is a metallic cylinder with helical grooves that spiral up the bit.

Twist drill with unequal flute spacing and unequal relief angles

ActiveUS20180250755A1Twist drillsAngular degreesEngineering

A twist drill having a shaft with a longitudinal axis, wherein the cutting tool includes a plurality of flutes extending about the longitudinal shaft along a helix angle and a plurality of lands adjacent the flutes. Each land has a cutting edge adjacent a corresponding flute and a margin (i.e. relief surface). A cutting point is adjacent a forward end of the shaft. A first, second and third forward cutting surfaces are adjacent the first, second and third cutting edges, respectively, and extend proximate the cutting point axially rearward for a predetermined length about the longitudinal axis of the shaft. The cutting edges are unequally angularly spaced from each other, and each forward cutting surface has a primary relief angle that are unequal to each other.

Twist drill with unequal flute spacing and unequal relief angles

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Owner:KENNAMETAL INC

Twist drill pipe

ActiveCN109882093AAvoid damageDrilling rodsDrilling casingsTorque transmissionEngineering

The invention discloses a twist drill rod which comprises a twist rod body. A connecting column is arranged at one end of the twist rod body, a connecting hole is formed in the other end of the twistrod body, the connecting column is provided with an external thread, the connecting hole is internally provided with an internal thread matched with the external thread on the connecting column, a torque transmission assembly is arranged in the connecting hole, the torque transmission assembly comprises an inner screw and a connecting sleeve pipe, and the connecting sleeve pipe sleeves the inner screw and is connected with the inner screw through the treads. A first plane clamping tooth is arranged at the end of the connecting sleeve pipe, a blind hole corresponding to the connecting sleeve pipe is arranged on the middle part of the connecting column, and a second plane clamping tooth corresponding to the first plane clamping tooth is arranged at the bottom of the blind hole. When the drill rod is driven, torque force between the connecting hole and the connecting column can be shared between the inner screw and the connecting sleeve pipe as well as between the first plane clamping tooth and the second plane clamping tooth, and the damage of the torque force to the threads between the connecting hole and the connecting column can be reduced.

Owner:ZOUCHENG YANKUANG TAIDE IND & TRADE CO LTD

2 results about "Twist drill" patented technology

Twist drill with unequal flute spacing and unequal relief angles

Twist drill pipe

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