Magnetic Fluid Grinding (MRF) Device
Q-flex 100, Q-flex 300, Q22-600, Q22-750, Q22-1200
A sub-aperture polishing device that can predict processing accuracy and processing time with high precision.
The MRF device can accommodate various shapes of workpieces, including flat, spherical, aspherical, freeform, cylindrical surfaces, and prisms, all with a single machine. It is also capable of processing a wide range of materials such as optical glass, crystals, and ceramics. [Product Lineup] 1. Q-flex Series (Q-flex 100, Q-flex 300) - Capable of rotary polishing, raster polishing, and freeform polishing. - Modular design reduces downtime for replacements. Polishing head, magnetic fluid (MR) polishing agent. 2. Large MRF Devices (Q22-600, Q22-750, Q22-1200) - Capable of raster polishing meter-class workpieces. - Allows for the exchange of polishing heads of different sizes. - Can be equipped with a pad polishing head (Q22-1200).
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basic information
* Principle of MRF The workpiece is polished by the shear force between the magnetorheological (MR) polishing fluid, which has increased viscosity due to the magnetic field, and the workpiece. This sub-aperture polishing technique achieves a high-precision optical surface by scanning the entire surface of the workpiece using the few millimeter "spot" formed between the MR polishing fluid and the workpiece as the polishing tool. The amount polished by the spot is proportional to the dwell time of the spot, allowing for the desired polishing process to be achieved by precisely controlling the dwell time while scanning the entire surface of the workpiece. * Performance of MRF MR polishing fluids can be selected based on three conditions: polishing rate, surface roughness, and material of the workpiece. The surface roughness is evaluated to be below 0.4 nm rms for any MR polishing fluid, and the MR polishing fluid with the best surface roughness has been reported to achieve 0.15 nm rms or sub-Å order. Additionally, the shape accuracy achieved by MRF can generally be stated to be around 1 to 3 nm rms, regardless of the MR polishing fluid used.
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Applications/Examples of results
Finishing processing of precision optical elements (glass, crystals, ceramics, etc.) and molds.
Company information
QED is a development manufacturer based in Rochester, New York. With its core technologies of MRF, an advanced polishing technology, and SSI, a high-precision aspheric measurement technology, it meets various needs in the precision optics industry. MRF is a polishing technology that uses a magnetic fluid to generate a polishing tool a few millimeters in size, which scans the entire optical surface to correct its shape with high precision. Regardless of the size or tilt of the workpiece's shape, it finishes the optical surface to a perfect shape. SSI is an interferometric measurement technology that connects the results of interference measurements from multiple sub-apertures, enabling high-precision measurement of the entire inspected surface. It allows for the measurement of aspheres and freeform surfaces without the need for dedicated null optics. Since its establishment in 1996, over 300 MRF/SSI devices have been utilized by more than 100 users worldwide.