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Surface Microroughness of Optical Glasses under ...

deterministic microgrinding, the resulting specular surfaces have typical rms microroughness of less than 20 nm, 1 µm of subsurface damage, and a surface figure better than 1/2 wave ... mode grinding 20,21 and is characterized by low surface micro-roughness and subsurface damage, low material-removal rates, ...

microgrinding technologies in dobaspet kiadb

microgrinding fibre - pneus-mpg.be. microgrinding fibre information -CPY manufacturers. microgrinding technologies in dobaspet kiadb- microgrinding fibre information, Microgrinding Fibre microgrinding technologies in dobaspet kiadb fiber cement grinding station for sale; Vertical mill grinding semen klinker;,El Products, El Salvador El Products Suppliers Directory, Yarn Waste ...

OSA | FAUST and WAGNER: producible shapes

Contour Mode Deterministic Microgrinding. E. Fess, J. Ruckman, and Yi Li GA6 Fabrication and Testing of Aspheres (FTA) 1999. Aspheres in Microlithography. David Williamson, Robert Kestner, Jay Daniel, and Daniel Bajuk DS2 Fabrication and Testing of Aspheres (FTA) 1999.

Analysis of chatter in contour grinding of optical ...

Aug 01, 2002· Chatter that limits ground surface finish has been observed in the deterministic microgrinding of brittle optical materials. In this article, the classical single degree of freedom model for chatter, accounting for both work and tool regenerative effects, is …

Prepolishing on a CNC platform with bound abrasive contour ...

Deterministic microgrinding (DMG) of optical glasses and ceramics is the commercial manufacturing process of choice to shape glass surfaces prior to final finishing. This process employs rigid bound matrix diamond tooling resulting in surface roughness values of 3-5μm peak to valley and 100-400nm rms, as well as mid-spatial frequency tool marks that require subsequent removal in secondary ...

Analysis of chatter in contour grinding of optical ...

Chatter that limits ground surface finish has been observed in the deterministic microgrinding of brittle optical materials. In this article, the classical single degree of freedom model for ...

Minimizing chatter in deterministic microgrinding by ...

Minimizing chatter in deterministic microgrinding by process parameter selection Tong, Sha; ... In this paper a model for regenerative chatter during the contour grinding of optical surfaces is developed. In this model, a nonlinear formula for projected contact area is used to derive the process cutting stiffness that predicts the occurrence of ...

Chatter simulation and stability predictions for contour ...

Chatter marks from 0.1 µm to 2 µm in depth have been observed on glass surfaces that have been deterministically microground in the contouring mode. A model for regenerative chatter during the contour grinding of optical glasses is developed and will be used to identify process parameter combinations that decrease the likelihood of chatter.

Minimizing chatter in deterministic microgrinding by ...

Chatter is one of the most critical errors in grinding since it can both degrade the surface quality and reduce productivity. In this paper a model for regenerative chatter during the contour grinding of optical surfaces is developed. In this model, a nonlinear formula for projected contact area is used to derive the process cutting stiffness that predicts the occurrence of chatter.

Tool wear and profile development in contour grinding of ...

Deterministic microgrinding technology applies a bound diamond abrasive tool positioned by a Computer Numerically Controlled (CNC) machine to generate precision optical components.

a Plated Cu Interlayer Xiaoli Wang

Deterministic microgrinding technology [5] ... A typical contour grinding process uses two tools sequentially. A rough tool with 10–20 μm hard particles is used to remove bulkmaterial.Then,afinetoolwith2–4μmhardpar- ... mode. To measure weight percentage of carbon of the coatings, 5 regions were tested and 4 of them were 3 ...

Chatter in deterministic microgrinding of optical glasses ...

Nov 11, 1999· Chatter in deterministic microgrinding of optical glasses Chatter in deterministic microgrinding of optical glasses Li, Yi 00:00:00 ABSTRACT In this paper, the chatter observed in the deterministic microgrinding of optical glasses is examined. Because chatter adversely affects ground surface quality, understanding and eliminating chatter could significantly …

Untitled Document []

In Deterministic Microgrinding (DMG), the wear of diamond grains is a significant problem and the cause for lowering grinding efficiency, which leads to "pull-out" (loose) of diamond grains from the binder and the appearance of scratching. It contributes to poor surface finish, increased machining forces, and increased tooling costs.

Twyman effect mechanics in grinding and microgrinding

In the Twyman effect (1905), when one side of a thin plate with both sides polished is ground, the plate bends: The ground side becomes convex and is in a state of compressive residual stress, described in terms of force per unit length (Newtons per meter) induced by grinding, the stress (Newtons per square meter) induced by grinding, and the depth of the compressive layer (micrometers).

Advancements in asphere manufacturing - NASA/ADS

Sep 01, 2013· Contour deterministic microgrinding is performed on a Pro80 or eSX platform. These platforms utilize software and the latest advancements in machine motion to accurately contour the aspheric shape. Then the optics are finished using UltraForm Finishing (UFF), which is a sub-aperture polishing process.

Measurement of the Preston coefficient of resin and bronze ...

Apr 01, 2006· Deterministic microgrinding (DMG) has become one of the major methods used for fabrication of precision optical components, ... Preston coefficient because the normal grinding force F N is easier to measure than the tangential grinding force during contour grinding. ... where the brittle grinding mode can be clearly identified.

Prepolishing on a CNC platform with bound abrasive contour ...

May 01, 2003· Deterministic microgrinding (DMG) of optical glasses and ceramics is the commercial manufacturing process of choice to shape glass surfaces prior to final finishing. This process employs rigid bound matrix diamond tooling resulting in surface roughness values of 3-5μm peak to valley and 100-400nm rms, as well as mid-spatial frequency tool marks that require subsequent removal in …