Precision turning processing method for off-axis aspheric mirror with large off-axis
An off-axis aspheric surface and processing method technology, which is applied in the field of off-axis aspheric mirror processing, can solve problems such as insufficient tool acceleration, tool destructive effects, and tool cutting interference, so as to improve processing efficiency, avoid cutting interference, and simple structure Effect
Active Publication Date: 2011-05-11
TIANJIN UNIV
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Problems solved by technology
When the slow tool servo control technology is used for large off-axis aspheric machining, due to the influence of the curvature change of the off-axis aspheric surface itself, when machining the center of rotation area, the cutting range is too large and the tool acceleration is not enough. The phenomenon of chipping, which leads to cutting interference of the tool, has a destructive effect on the tool, which seriously affects the real application of the method
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[0022] figure 1 It is a schematic diagram of the processing system of the present invention. The system consists of lathe spindle 1, diamond tool 2, fixture 3, counterweight 4 and alignment block 5 and other parts. The alignment block 5 is responsible for controlling the eccentric installation amount of the off-axis aspheric surface, and one side thereof is close to the lowest side of the off-axis aspheric surface; the counterweight 4 is responsible for adjusting the balance of the rotary fixture 3, and is located on the symmetrical side of the off-axis aspheric surface; Fix the processing system on the lathe spindle 1 by using the clamp 3 and the vacuum suction cup provided by the ultra-precision diamond lathe. The heights of the counterweight 4 and the alignment block 5 are lower than the minimum height h of the off-axis aspheric surface, and the eccentricity δ of the installation of the off-axis aspheric surface is much smaller than the off-axis amount of the off-axis asph...
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The invention belongs to the technical field of manufacturing and ultra-precision processing of optical devices and relates to a precision turning processing method for an off-axis aspheric mirror with large off-axis. The method comprises the following steps: processing the off-axis aspheric surface of a to-be-processed workpiece roughly and selecting a balancing weight; precisely milling an alignment block with a precision machine tool and manufacturing the alignment block; calculating offset and determining the processing equation according to the parameters of the off-axis aspheric surface; calculating turning processing according to the manner of controlling the movement through slow tool servo and calculating the path of a non-turning area according to the manner that the position of a tool remains the same in the z direction; placing the alignment block in the center of a fixture, and arranging the to-be-processed workpiece and the balancing weight at the periphery of the alignment block in a weight balancing manner so as to assemble the to-be-processed workpiece, the balancing weight and the alignment block on the fixture together; and performing ultra-precision turning. The processing method provided by the invention has the advantages that the processing efficiency is improved, and the sizes of to-be-processed workpieces are increased, thereby being applicable to processing an off-axis aspheric surface with arbitrary off-axis.
Description
technical field [0001] The invention belongs to the technical field of optical device manufacturing and ultra-precision processing, and relates to a processing method of an off-axis aspheric mirror. Background technique [0002] Off-axis aspheric mirror is a common optical device in architectural optical systems, which can realize beam convergence or divergence, and adjust the direction of optical path. The optical system formed has fewer components, no obstruction, long focal length, large field of view, wide band, and the ability to suppress stray light Strong, high modulation transfer function and other characteristics. The off-axis aspheric mirror plays a very important role in the space optical system. The three-mirror reflection system formed by using it is the core component of the space telescope, which can avoid central occlusion, reduce the volume and weight of the system, and improve the imaging quality of the system at the same time . Off-axis aspheric mirrors ...
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IPC IPC(8): B23B1/00B23B5/00
Inventor 房丰洲张效栋
Owner TIANJIN UNIV