Manufacturing method of cover board of cavity filter

Abstract

The invention discloses a manufacturing method of a cover board of a cavity filter. The method comprises the following steps: selecting materials, carrying out positioning and processing a tuning threaded hole; stretching a board through a hydraulic stretching machine, stretching a copper surface of the cover board to an aluminum surface in the stretching process, and arranging a plurality of stations on a stretching die according to the thickness of the board and the requirements of materials; quickly stretching the board with the determined tuning threaded hole position on the cover board to the initial station after stretching is started, stretching the board from fast to slow for a plurality of times, and stretching the board to the final station by the hydraulic stretching machine; enabling the stretching machine to begin to slowly return to the normal position, reversely jacking a processing head of the stretching machine quickly in the return process for a plurality of times, and enabling the stretching machine to return to the normal position after reverse jacking is ended; and processing a lug boss which is integrated with the cover board in the position of the tuning threaded hole by the hydraulic stretching machine, wherein the middle part of the lug boss is hollow. The stretching problem is handled by an oil press; and compared with a conventional punching mode employing a punching machine, the manufacturing method is higher in yield and better in manufacturing effect.

Description

technical field [0001] The invention relates to the field of signal processing, in particular to a method for manufacturing a cavity filter cover plate. Background technique [0002] At present, the signal processing of the cavity filter is usually completed by the tuning self-locking screw on the filter cover. Generally speaking, the problem dealt with by the tuning screw is the problem of signal intermodulation. Specifically, it refers to two different frequency signals. A signal of a new frequency generated by superposition within a system. [0003] The current common method of manufacturing filter cover plates usually uses pure copper materials or metal materials with electroplated copper on the surface, which is relatively expensive. On the one hand, the stamping method is easy to damage the cover plate, and the defective rate is high. On the other hand, the processed tuning hole needs to be additionally installed with a tuning screw sleeve. The installation of the tu...

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Problems solved by technology

[0003] The current common method of manufacturing filter cover plates usually uses pure copper materials or metal materials with electroplated copper on the surface, which is relatively expensive. On the one hand, the stamping method is easy to damage the cover plate, and the defective rate is high. On the other hand, the processed tuning hole needs to be additionally installed with a tuning screw sleeve. The installation of the tuning screw sleeve not only requires labor costs and processing costs, but at the same time, the additional tuning screw sleeve installed on the tuning hole is not stable, and it is easy to loosen after a period of time. Moreover, the interface between the tuning hole and the tuning screw sleeve is not smooth, which ultimately affects the actual tuning effect

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