| 摘要 |
PROBLEM TO BE SOLVED: To efficiently remove burrs generated during machining, such as cutting of a sheet and drilling, and to facilitate a chamfering work. SOLUTION: A pair of chamfering tools 26 and 28 are positioned facing each other and moved forward and backward to the sides of sheets 2 for uniting and disassembly and united together and moved along the side corner part of a portion, where the side and the end face of the sheet 2 make contact with each other, as integral rotation is executed. A pair of the chamfering tools 26 and 28 are provided with conical chamfering parts 30 and 32 brought into slide contact with the respective side corner parts of the sheet 2.
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