Toshiba TUNGALOY Co., Ltd. has introduced TDX series indexable drill bits with Φ12.5～Φ54.0mm and L/D=2, 3, 4 and 5. Its characteristics are: (1) A blade has 4 tips to participate in cutting. The center edge and the circumferential edge can be indexed and the economy is good; (2) The ideal balance design can suppress the vibration when the tool is cut in, and can achieve stable processing; (3) The new three-dimensional chipbreaker blade is adopted, which is suitable for ordinary The processing of mild steel and stainless steel, which is difficult to handle from steel to steel; (4) The shape of the separate flutes that can be separated from each other can smoothly discharge the chips cut out by the central cutting edge which is likely to cause clogging. (5) The thickness of the blade is thicker than that of the previous blade, which improves the damage resistance and prolongs the service life of the tool. (6) Since stable cutting and good chip evacuation are achieved, the machining accuracy can be improved and a good machined surface roughness can be obtained.
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