| 摘要 |
PROBLEM TO BE SOLVED: To provide a double side finishing hole saw capable of deburring and chamfering simultaneously with drilling by providing a simple double side finishing device in the conventional hole saw. SOLUTION: One or a plurality of protrusions 8 having a blade 9 are provided on the external periphery of a barrel unit 2 of a hole saw in the past, a U-shaped clipping 6 is provided in a periphery of the protrusion 8 so as to wrap it, this clipping is formed to serve as a double side finishing device. An opened hole 10a is made by this double side finishing hole saw, it is further left as is, when this double side finishing hole saw is pressed in until the protrusion comes into contact with a cut port of the opened hole 10a, a burr in a surface side of the opening hole 10a is cut removed by the blade 9, and when the hole saw is further pressed in, the protrusion 8 is pressed to the cut port of the opened hole 10a, to be advanced into the barrel unit 2 by spring action of a tool rest 7, in addition when the hole saw is further pressed in, the protrusion 8 comes out from the barrel unit 2, to come into contact with a burr in a reverse side of the opened hole 10a, and cut remove the burr. Accordingly, drilling and the deburring and chamfering of both reverse surface and obverse surface can be performed in a short time. Wounding a hand and finger by chamfering work is eliminated.
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