| 摘要 |
A method for forming a spherical concave surface includes the steps of bringing a tool into contact with a material to be formed, rotating the material around a predetermined axis, and moving the tool in a first direction parallel to a central axis of the tool and in a second direction perpendicular to the first direction for forming the spherical concave surface on the material. The method also may include the steps of forming an acute first angle between the central axis and the predetermined axis, and forming an acute second angle between the central axis and a tangent line parallel to the central axis and passing through a first end point of the spherical concave surface.
|
