Mirror image milling method and system for skin machining

Abstract

The invention provides a mirror image milling method and system for skin machining. A machining tool is arranged on a machining surface. A set of floating supporting devices, a skin appearance laser scanning device and a set of skin wall thickness real-time measuring devices are arranged in a symmetric area of the machining surface of the skin. Before skin machining, the skin appearance laser scanning device is used for obtaining the actual skin molded surface, and the machining path is adjusted in a self-adaptation manner according to the actual skin molded surface. Then, in the skin machining process, the machining tool collaboratively moves with the floating supporting devices and the skin wall thickness real-time measuring devices in the symmetric area on the machining surface; and in the machining process, flexible supporting of the machining area of the skin workpiece is provided through floating supporting, the skin wall thickness real-time measuring devices obtain the thickness of the machining area, the machining tool adjusts the cutting depth in a self-adaptation manner according to the measured actual workpiece thickness, and wall thickness control over the skin is achieved.

Description

technical field [0001] The present invention relates to the field of skin processing, in particular to a mirror image milling method and system for skin processing, especially for mirror processing of hyperbolic / single-curved wall plate parts with strict wall thickness requirements such as large skins and similar workpieces Methods and equipment. Background technique [0002] In the field of skin processing, since 1970, chemical milling has been widely used in the processing of hyperbolic / single-curved wall plate parts with strict wall thickness requirements such as large skins and similar workpieces. The working principle of chemical milling is to first protect the non-machined surface of the workpiece with a corrosion-resistant coating, expose the surface to be processed, and then immerse the workpiece in a chemical solution for corrosion, so that the metal is dissolved and removed according to specific parts to achieve the purpose of processing . Chemical milling has th...

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Problems solved by technology

[0003] 1. It is difficult to guarantee the wall thickness accuracy of chemical milling. The thickness accuracy of chemical milling is currently generally ±0.5mm, while the wall thickness of large skins is required to reach ±0.1mm

[0004] 2. The contour accuracy is poor. The contour of the chemical milling area is usually guaranteed by manual engraving, resulting in a low contour accuracy of 2mm, while the large-scale skin contour accuracy requires ±0.3mm

[0005] 3. Many new skins cannot be processed by chemical milling, such as the aluminum-lithium alloy skin of a new aircraft cannot be processed by chemical milling due to material characteristics

[0007] The above-mentioned traditional chemical milling can no longer meet the processing requirements of hyperbolic / single-curved wall plate parts with strict wall thickness requirements such as large skins and similar workpieces.

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