User: Confidential
Contact: Dr. Ralf Dupont, Levicron
Date: April 2013
Laser reflector hard milling
Laser mirrors are required for an accurate deflection of laser beams. This example shows the machining of a laser reflector mold in hardened steel based on a polynomial function. Therefore, we used a 3-axis ultra-precision machine tool with slow-tool servo function (rotary axis synchronized with linear axes) and our ASD080H25 with a 3mm CBN tool.
The goal was to minimize machining time at a fixed maximum surface finish. The rough machining was done at 0.1 mm cutting depth and 0.05 mm/tooth. The finish machining was done at 5 micron cutting depth and a feed rate of 5 micron/tooth.
The surface result achieved a roughness of 18 nm Ra with 2 hours overall machining time.
See the video
Information and results
Application:
Machining of a laser reflector, 1.2080, HRC-52
Machine:
UL-Ultra MTC 250 (3 axes, slow-tool servo)
Used Machining spindle:
ASD080H25 at 80,000 rpm
Roughing
Tool: Standard carbide ball end mill, D3
Cutting depth: 0.3 mm
Roughing time: 40 minutes
Finishing
Tool: CBN ball end mill, D3
Cutting depth: 10 µm
Overall machining time: 2 hours
Achieved surface finish:
< 18 nm Ra
