Compound forming method for large-curvature double-curve-degree high-accuracy antenna panel

Abstract

The invention relates to a compound forming method for a large-curvature double-curve-degree high-accuracy antenna panel. The antenna panel particularly comprises three layers of pre-stretched aluminum plates, two layers of durable honeycomb cores and a plurality of pre-embedded pieces for connecting a back rack, wherein the three layers of aluminum plates comprise a pre-stretched working plate, a pre-stretched middle connecting plate and a pre-stretched back plate, which are cut and trimmed according to sample plates. The forming method at least comprises the following main steps of: performing three-dimensional modeling of the three layers of plates of the large-curvature double-curve-degree high-accuracy antenna panel; performing spacial geometric unfolding of the three layers of plates, and positioning the three layers of plates on a nail bed; performing laser processing of the sample plates of the three layers of aluminum plates; manufacturing an entity mould according to a moulding surface of the working plate; performing pre-stretching forming of the three layers of aluminum plates, and cutting and trimming the three layers of aluminum plates according to the sample plates; calculating the nail height, and positioning the three layers of pre-stretched plates on a high-accuracy nail bed; and manufacturing the large-curvature double-curve-degree high-accuracy antenna panel by laying sandwich structures layer by layer.

Description

technical field [0001] The present invention relates to a composite forming method of a high-curvature double-curvature high-precision antenna panel, in particular to a high-curvature double-curvature continuous surface high-precision honeycomb sandwich structure antenna panel forming method, which belongs to mechanical engineering / sheet metal forming field. Background technique [0002] With the rapid development of satellite communications, radio measurement and control, deep space exploration and large radio telescopes, not only the demand for antennas is more and more extensive, but also the accuracy, environmental adaptability and reliability of the antenna antenna panel are raised. Require. As the frequency of electromagnetic waves received by outdoor antennas is getting higher and higher, the RMS value (root mean square value) of the antenna surface is required to be higher and higher. Compared with the antenna panel in the microwave anechoic chamber, the outdoor an...

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Problems solved by technology

For the manufacture of antenna panels with large curvature, the overall structural springback is still large, and the forming accuracy is poor

[0006] 2. The slotting scheme destroys the integrity of the three-layer aluminum plate, especially the gap between the working plate and the back plate

Although the gaps on the surface of the antenna panel manufactured by this scheme are sealed with conductive glue, the long-term outdoor weathering will probably cause the conductive glue to fall off, and then corrode the honeycomb core, resulting in a change in the local shape of the antenna panel , affecting electrical performance

Therefore, the antenna panel manufactured by using the slit scheme is not suitable for outdoor use in complex and changeable environments. There is an urgent need for a process scheme with a continuous surface and high molding precision to form a high-precision antenna panel with large curvature.

[0007] 3. The existing continuous surface stress release forming method is mainly to open a narrow groove that does not exceed two-thirds of the thickness of the aluminum plate, but the stress release effect is not as good as the slotting method, and it is only suitable for forming high-precision panels with small curvature

For panels with slightly larger curvature, the forming accuracy is poor

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