| 摘要 |
<p>A helical multilevel cutting tool has high heat emission efficiency , great strength and excellent durability , and can be positioned easily during drilling operation. The cutting tool includes an cutter shank and a cutter head which are integrally formed, wherein the cutter head is provided with several helical pieces integrally, each helical piece has a cutting blade, and a heat emission platform is formed along the cutting blade, a second cutting blade which faces forwardly as viewed in the direction of the cutting operation is formed on the front of the heat emission platform , a cutting blade outer surface is formed between the heat emission platform front surface and the second cutting blade. An outer front cutting blade is formed on the top surface of the cutter head at a position where it meets the heat emission platform front surface, and a front cutting blade is formed between the second cutting blade and the center of the cutter head top surface.</p> |
