| 摘要 |
PURPOSE:To raise chips, form the chips into an eddy state and improve cutting performance in processing a workpiece difficult to cut by forming a step part on a secondary cutting face adjacent to the primary cutting face of cemented carbide tips fixed at equal intervals to the periphery of a metal base, but at a position away from the primary cutting face. CONSTITUTION:For the cemented carbide tip 3 of a saw blade, a primary cutting face 3a of length S1 with a primary rake angle r1 is formed on cutting edge top for restraining cutting resistance and maintaining cutter tooth strength. Subsequent thereto, a secondary cutting face 3b of length S2 is formed with a secondary rake angle r2, and a stepped part 3c is formed to be one step higher with a level difference 3g on a slope. Also, for the primary rake angle r1, a flank 3d with a clearance angle r3 is formed at the back thereof. The circular saw brazed with said cemented carbide tip 3 cuts chips into fine pieces with a chip parting groove 3f, when processing the chips with each cutting edge. Thereafter, the chips so processed are held upward with the level difference 3g and formed into an eddy state. Therefore, a workpiece is free from a deposit of chips and cooled without any such deposit, thereby improving cutting performance.
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