| 摘要 |
PROBLEM TO BE SOLVED: To provide a metal tube cutting apparatus capable of reducing the size of burrs generated, when cutting a square metal tube, at a side where a cutting blade goes away from the tube.SOLUTION: A pair of clamping bodies 10, 11 for clamping a square metal tube 2 have holding grooves 101, 111 opposing each other, respectively. When the pair of clamping bodies 10, 11 clamps the square metal tube 2, the holding grooves 101, 111 hold the square metal tube 2 so that a cutting blade 12 gets into the square metal tube 2 from a first corner portion 2b of the square metal tube 2, and goes away from the square metal tube 2 from a second corner portion 2c of the square metal tube 2, opposing the first corner portion 2b. Inner surfaces 101c, 111c of the holding grooves 101, 111 on a side where the cutting blade 12 goes away from the square metal tube 2 form a curved surface of which a radius of curvature is an average radius of curvature obtained by averaging radiuses of curvature of outer surfaces of the second corner portions 2c of a plurality of the square metal tubes 2.SELECTED DRAWING: Figure 1 |
