Contour Mode Deterministic Microgrinding. E. Fess, J. Ruckman, and Yi Li GA6 Fabrication and Testing of Aspheres (FTA) 1999. Chatter simulation and stability predictions for contour grinding of optical glasses. Yi Li, S. …
Micro-grinding is a tool based mechanical micromachining process which is mostly applied to create and finish 3D micro-features on hard and brittle materials such as glass, silicon, alumina, etc. Miniature-sized abrasive tool comes in physical contact with the workpiece and removes the unwanted material with mostly nanometric undeformed chip …
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 adapted for contour grinding optical surfaces.A linearized expression for the cutting …
This paper discusses COM's recent manufacturing technology advances and describes the capabilities of the newly developed 2-axis contour grinding machine for glass and IR …
This thesis makes use of microindentation, nanoindentation and nanoscratching methods to better understand the mechanical properties of single crystalline silicon, calcium fluoride, and magnesium fluoride. These properties are measured and are used to predict the material's response to material removal, specifically by grinding and polishing, which is a …
Glass-ceramics are composites consisting of glass and crystalline phases. We report a series of microgrinding and polishing experiments: our first goal is to correlate material mechanical properties with the quality of the resulting surface, determined by surface microroughness and surface grinding-induced residual stresses. Our second …
DOI: 10.1016/J.IJMACHTOOLS.2003.08.015 Corpus ID: 109394646; Tool wear and profile development in contour grinding of optical components @article{Li2004ToolWA, title={Tool wear and profile development in contour grinding of optical components}, author={Yi Li and Paul D. Funkenbusch and Sheryl M. Gracewski and Jeffrey L. Ruckman}, …
In deterministic microgrinding, the infeed rate of the microgrinding tool across the optical workpiece is optimized and controlled. This leads to precise knowledge of the amount of …
'Contour mode deterministic microgrinding'. Fabrication and Testing of Spheres. 24, Optical Society of America, GA6, OSA Trends in Optics and Photonics Google Scholar; 10. Gabler, J., Pleger, S. (2010). 'Precision and micro CVD diamond-coated grinding tools'. International Journal of Machine Tools & Manufacture.
We describe and correlate experiments on optical glasses from the literature in conditions of loose abrasive grinding (lapping at fixed nominal pressure, with abrasives 4-400 μm in size) and deterministic microgrinding experiments (at a fixed infeed rate) conducted at the Center for Optics Manufacturing with bound diamond abrasive tools …
A model for regenerative chatter during the contour grinding of optical surfaces is developed and a nonlinear formula for projected contact area is used to derive the process cutting stiffness that predicts the occurrence of chatter. ... {Minimizing chatter in deterministic microgrinding by process parameter selection}, author={Shangqing Tong ...
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 …
We report a series of microgrinding and polishing experiments: our first goal is to correlate material mechanical properties with the quality of the resulting surface, …
Glass-ceramics are composites consisting of glass and crystalline phases. We report a series of microgrinding and polishing experiments: our first goal is to correlate material mechanical properties with the quality of the resulting surface, determined by surface microroughness and surface grinding-induced residual stresses. Our second …
Deterministic microgrinding of precision optical components with rigid, computer-controlled machining centers and high-speed tool spindles is now possible on a commercial scale. Platforms such as the Opticam systems at the Center for Optics Manufacturing produce convex and concave spherical surfaces with radii from 5 mm to infinity, i.e., …
In the limit of small abrasive size (ductile-mode grinding), the maximum surface compressive stress achieved is near the yield stress of the glass, in agreement with finite-element simulations of indentation in elastic-plastic solids. ... and deterministic microgrinding experiments (at a fixed infeed rate) conducted at the Center for Optics ...
In deterministic microgrinding (DMG) of glass optics with metal bond diamond abrasive ring tools, cutter marks are generated on the lens surface by the relative motion between the grinding tool ...
In the limit of small abrasive size (ductile-mode grinding), the maximum surface compressive stress achieved is near the yield stress of the glass, in agreement with finite-element simulations of indentation in elastic–plastic solids. ... and deterministic microgrinding experiments (at a fixed infeed rate) conducted at the Center for Optics ...
Deterministic Microgrinding All samples prepared by deterministic microgrinding were nominally prepared under the same conditions. Typically the final 2- to 4-mm tool was run at 15,000 rpm, with a work speed of 180 rpm, an infeed rate of 6 mm min21, a total material removal of 12 mm, and a dwell time after infeed of 15 s.
Contour Mode Deterministic Microgrinding. E. Fess, J. Ruckman, and Yi Li GA6 Fabrication and Testing of Aspheres (FTA) 1999
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 reduce total fabrication time. First, a description of the characteristics of chatter marks observed on ground glass surfaces is presented.
Magnetorheological finishing (MRF) is a deterministic, sub-aperture polishing technology that is very helpful in improving both surface nano-roughness and surface figure and can be used to polish silicon materials. ... Fabrication of glass aspheres using deterministic microgrinding and magnetorheological finishing Proceedings of …
We review extensive data on measured subsurface damage and surface roughness resulting from lapping (loose abrasive grinding under fixed nominal pressure) and deterministic microgrinding (bound abrasive grinding under fixed nominal infeed) of commercial optical glasses with a large range of abrasive sizes. Subsurface damage is …
A COM developed 5-axis microgrinder that brings precise deterministic control to the manufacture of axisymmetric and non-axisymmetric freeform optical shapes is …
Deterministic microgrinding of precision optical components with rigid, computer-controlled machining centers and high-speed tool spindles is now possible on a commercial scale. Platforms such as the Opticam systems at the Center for Optics Manufacturing produce convex and concave spherical surfaces with radii from 5 mm to ∞, i.e., planar, …
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 ...
Deterministic microgrinding (DMG) process technology, developed by the Center for Optics Manufacturing (COM) at the University of Rochester, ... Contour Mode Deterministic Microgrinding. E. Fess J. Ruckman Yi …
The microindentation fracture toughness in nondensifying optical glasses is in good agreement with bulk fracture toughness measurement methods. Deterministic microgrinding of precision optical components with rigid, computer-controlled machining centers and high-speed tool spindles is now possible on a commercial scale. Platforms …
Several aspheric lens elements have recently been produced using new manufacturing processes. Deterministic microgrinding and magnetorheological finishing technologies were employed to fabricate ten 47 mm diameter plano convex hyperboloidal aspheric condenser lenses. The parts had an aspheric departure of 145 microns from best fit …
This removal mode in microgrinding of LMGC and LDGC is indistinct from those in CAD/CAM diamond milling of LMGC [12] and simulated diamond grinding of LDGC [13]. However, microgrinding of LMGC yielded the lowest S a value of 0.241 μm ( Fig. 4 a), smaller than 1.125 μm S a [ 23 ] and 1.11 μm R a [ 12 ] produced by dental …
