The Dressing Method of Composite Sectional Profile of Optical Machining Parallel Diamond Grinding Wheel

Abstract

The invention provides a finishing method for a composite section contour of a center straight line and two lateral edges arc transitions of a parallel diamond grinding wheel for optical machining; the method comprises the steps of 1) adjusting parallelism between a rotary shaft of a finishing grinding wheel on a finishing device and a vertical Y axis of an ultra-precision surface grinder; 2) using the finishing grinding wheel, by means of end grinding, to polish an outer peripheral face of the diamond grinding wheel so that the outer peripheral face of the diamond grinding wheel gains peripheral runout precision and axial parallelism meeting the requirements of machining techniques; 3) adjusting a feeding direction of the diamond grinding wheel to be inclined angularly to an X axis of the ultra-precision surface grinder, and using the finishing grinding wheel, by means of end grinding, to grind the two lateral edges of the diamond grinding wheel into smooth arcs. Diamond grinding wheel dressing and truing are performed at the same time, so that it is possible to accurately acquire width of the center line segment and height of the arc transitions on two sides, machining stress concentration caused to edges of the grinding wheel during grinding is effectively avoided, and sub-surface defect depth and instability of a component are decreased.

Description

technical field [0001] The invention relates to the field of ultra-precision grinding of optical elements, in particular to the compound cross-sectional profile of the central flat line and the arc transition of both sides of the parallel diamond grinding wheel used in the process of grinding subsurface defects and depth stability control of optical elements trimming method. Background technique [0002] Transmissive optical elements are widely used in high-power laser devices, and their processed subsurface defects have an important impact on the anti-laser damage threshold of the element and the overall output performance of the entire device. Ultra-precision forming grinding of optical components by using fixed abrasive parallel diamond grinding wheels can efficiently obtain high-precision optical surfaces, but at the same time, it is necessary to strictly control the quality of subsurface defects in full aperture to facilitate subsequent polishing processing on grinding ...

AI Technical Summary

Problems solved by technology

In addition, when using a single-point diamond pen to modify the diamond grinding wheel, the interaction between the two superabrasives will easily lead to serious wear of the diamond pen, and at the same time, the diamond particles on the surface of the diamond grinding wheel will be damaged and fall off, resulting in a decline in the grinding performance of the grinding wheel, which is not suitable for optics. Processing field

[0004] CN201510263137A discloses an arc grinding wheel online dressing device based on the spherical envelope of a cup-shaped tool, which can realize online dressing of aspheric grinding arc diamond grinding wheels. Severe small-scale ripple errors are also introduced when planar components

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