In situ контроль шероховатости при финишной обработке неметаллических материалов

Описано схему обладнання для моніторингу поверхні в процесі полірування, що здійснюється за допомогою оптичних методів. Відношення інтенсивності променю, що відбивається від поверхні, до інтенсивності падаючого променю дозволяє оцінити коефіцієнт відбивання in situ. Встановлено, що в процесі зменшення шорсткості поверхні її коефіцієнт відбивання збільшується.The optical monitoring system for finishing processing surfaces is described. The relation of intensity of the beam reflected from a surface, to intensity of a falling beam allows to estimate a reflexion index in situ. Increase of reflexion index in process of roughness decrease is established.Описана схема установки для мониторинга поверхности в процессе полирования, осуществляемого при помощи оптических методов. Отношение интенсивности луча, отраженного от поверхности, к интенсивности падающего луча позволяет оценивать коэффициент отражения света in situ. Установлено, что в процессе уменьшения шероховатости поверхности ее коэффициент отражения увеличивается

Bound-abrasive grinding and polishing of surfaces of optical materials

International audienceProblems of efficiency and quality improvement of diamond abrasive finishing of optical materials by tools with bounded polishing powders, including diamond powder, are considered. The dependences of the particle number on the diffusion angle and coordinate of the contact have been derived in the studies of the dynamics of collision and diffusion of slime particles. The coordinate dependence of the flat surface roughnessof glass K8 optics in fine diamond grinding has been described. Interaction and dispersion of deterioration particles in a contact zone ofthe tool and the processed sample in the course of polishing is described and the dispersion structure of deterioration particles of the tool on slimeparticles and on deterioration particles is explained oscillatory. It is shown a that differential dispersion section of deterioration particles on slimeparticles is not less than on deterioration particles and is maximum at corners of dispersion close to 0◦ and 180◦ on the central sites of a contactzone. Coordinate dependence of the full dispersion section of deterioration particles of the tool and dependence of microprofile height of theprocessed surface on circular zones radius are calculated

In situ control of roughness of surfaces at polishing by reflectometric metod

International audienceIt is demonstrated that the removal rate in polishing optic materials decreases exponentially with increasing bond energy in these materials and the polished surface roughness depends on the ratio of natural frequencies of molecular fragments on the tool and workpiece surfaces. The dependences of polished surface roughness on the slime particle size, permit an optimal choice of powders for a bound-abrasive polishing tools, which will ensure a required polished surface quality. The dependences of the polished surface microprofile parameters on the coordinate of a zone under study, which were described by periodic functions, do represent the effects that occur in the tool-workpiece contact zone. The optical monitoring system, the device for giving of the technological environment in a zone of contact of the tool and a processed detail and a technique of adjustment of the machine tool for finishing processing of precision optic surfaces are described. The relation of intensity of the beam reflected from a surface, to intensity of a falling beam allows to estimate a reflexion index in situ. Increase of reflexion index in process of roughness decrease is established. Possibility of active quality assurance of precision surfaces in the course of processing is shown