Method for micro-grinding tip-accurately induced brittle fracture forming of curved mirror surface

A method for micro-grinding tip-accurately induced brittle fracture forming of a curved mirror surface, comprising:

• grinding a surface of an optical glass material in a rectangle plate by means of a V-shaped tip of a diamond grinding wheel to form a V-shaped microgroove having a groove micro-tip;
• and
• setting two supporting points with a distance of L therebetween on one side of the optical glass material where the V-shaped microgroove is machined, providing a loading pressing head having a horizontal deviation distance of l between a loading point and the groove micro-tip on the other side of the optical glass material, and allowing the loading pressing head to perpendicularly apply a loading force F onto the optical glass material at a loading speed of ν, and forming a penetrated smooth curved surface via the loading point of the loading force F and under induction of the groove micro-tip,
• wherein the loading force F is:
• F
• =
• 22.1
• 
• 
• B
• 
• (
• W
• -
• h
• v
• )
• 2
• 
• (
• 0.3333
• 
• r
• v
• +
• 0.0104
• )
• 0.4552
• Lr
• v
• 0.4552
• 
• (
• 1
• +
• 0.54
• 
• (
• 1
• +
• 0.0104
• 0.3333
• 
• r
• v
• )
• -
• 0.8897
• )
• ,
• wherein B represents a workpiece width, W represents a workpiece thickness, hν represents a microgroove depth, rν represents a groove tip radius, and L represents a supporting point distance.