| 摘要 |
PROBLEM TO BE SOLVED: To machine the forming surface more precisely by giving relative rotation to a die around the working edge part of the tip to a cutting tool in addition to the axial and radial motion of the die driven rotationally. SOLUTION: In a plane passing a rotating shaft 11, not only giving the axial (X-direction) and radial (Y-direction) feed to a die raw material 10, but also the rotary motion in the direction ofθaround the working edge part 20x (axis- Z) of the tip of the cutting tool 20 is given to the cutting tool 20 made of monocrystal diamond. When the rotary motion is thus given to the cutting tool 20, it is possible to always face the cutting tool 20 in a fixed direction with respect to a zone 12a of zone forming surface 12. Thus, the shape of the lens surface is approximated at the tangential plane so that a positional matching error of a straight line cutting part 20a of the cutting tool 20 is not increased.
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