US Patent 11865627 Twist drill
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US Patent 11865627 Twist drill
Article
Patent abstract
The present invention provides a twist drill. A cone portion is provided at a front end of the operating portion, and an exterior surface of the operating portion is provided with a spiral flute for shunting cutting chips. The exterior surface of the cone portion is provided with a plurality of composite cutting blade groups which are sequentially enlarged in diameter from the front end to the rear end of the cone portion. The cone portion is provided with a top blade on the tip. In use, the top blade is used for positioning, and the cutting process is carried out by the top blade and the composite cutting blade groups.
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Patent Number
Patent Inventor Names
Hongjia Wang0
Date of Patent
January 9, 2024
0Patent Application Number
180951190
Date Filed
January 10, 2023
0Patent Citations
Patent Primary Examiner
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