| 摘要 |
PROBLEM TO BE SOLVED: To obtain a method for cutting using a cutting edge for a heat sink by which productivity can be improved by making the life span of the cutting edge for the heat sink long. SOLUTION: An angle of which the proceeding direction 12 of the cutting edge 10 makes with the horizontal is givenθ, an angle of which the flank 11 of the cutting edge 10 makes with the proceeding direction 12 of the cutting edge 10 is givenα, an angle of which a cutting face 13 formed on a long aluminum material 1 makes with the horizontal is givenθ', the angle conversion value of the moving amount of the long aluminum material from the cutting-in of the cutting edge to a dead point below the cutting edge is given A, the angle conversion value of an elongated amount in the long aluminum material due to the resistance of the cutting edge is given B, the angle conversion value of the moving amount of the long aluminum material from the dead point below the cutting edge to the separation of the cutting edge is given C, cutting is performed so as to beα>=θ'-θ+C=A+B+C by adding a recess to the cutting edge 10.
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