Method and apparatus for ultra precise machining of a curved and iron-containing negative surface of a mold insert, mold insert as well as a subsequent optical element

摘要

The present invention relates to a method for ultra precise machining of a curved and iron-containing negative surface of a mold insert (7) for the replicative production of an optical element with a correspondingly curved optically functional positive surface, comprising the steps of:Fixing of the mold insert (7) in a workpiece holder (5) of a machine tool (1),cutting machining of the negatively surface of the mold insert (7) with a tool cutting edge (11) of a monocrystalline diamond,the tool cutting edge by means of ultrasound is set in vibration and as a function of the location of the diamonds of the negatively surface of the supply of the diamond with a frequency of more than 0,3 hz, preferably more than 0,5 hz is controlled.Furthermore, the invention relates to a device suitable for this purpose, a mold insert as well as a subsequent optical product.