Method for milling microwave parts with irregular structure through micro-stress

Abstract

The invention provides a method for milling microwave parts with an irregular structure through micro-stress. The method comprises the following steps: (101) precisely milling the length, width and height of a sunken cavity and the length, width and height of part features; (102) performing adhesive sealing through a predetermined adhesive; (103) precisely milling the thickness allowance of parts to obtain the final thickness size of the parts; and (104) removing the adhesive on the parts through a predetermined solvent. According to the scheme, the microwave parts with the irregular structure can be precisely machined, the surface quality of the microwave parts is improved, and the signal transmission performance is improved; according to a micro-stress clamping method, the deformation of the parts in a machining process can be reduced, and the size accuracy requirements of the parts are effectively met; the production efficiency and the yield of the parts are improved.

Description

technical field [0001] The invention belongs to the technical field of irregular-structure microwave parts processing, and in particular relates to a method for realizing micro-stress milling of irregular-structure microwave parts. Background technique [0002] Irregular structure microwave parts (such as coupling inner conductor of directional coupler, coupling ring in YIG filter and attenuator transmission strip line reed, etc.) are widely used in various microwave instruments, and their processing dimensional accuracy, surface roughness and The shape and position accuracy directly affects or determines the electrical performance index of the device. Due to the irregular shape and small size of such parts, the requirements for dimensional tolerance accuracy, surface roughness, and shape and position accuracy are very high. Therefore, its forming method has long been a major technological problem that has plagued microwave device research and development units. . [0003]...

AI Technical Summary

Problems solved by technology

On the other hand, slow wire cutting has low production efficiency and low yield

[0004] For the coupling ring in the YIG filter with a frequency of 26.5GHz and below, due to its large size (the inner diameter of the ring is 0.5mm), the precision requirement is not very high, so the copper wire is flattened and then molded into a mold. , but due to the limitations of material springback and molds, the shape and size of the parts after bending and forming will deviate from the drawings.

[0005] For the coupling ring in the YIG filter with a frequency of 40GHz and above, its structure is more singular and its size is smaller (its width is only 0.03mm and its thickness is only 0.09mm). Corrosion processing method for forming, there is no suitable forming process at this stage

[0006] In the WEDM electro-corrosion molding process of the coupled inner conductor, tiny particles and pits are formed on the surface of the part due to discharge, resulting in low surface quality of the part, thereby reducing the transmission performance of the part and affecting the overall performance of the microwave device. have a considerable impact

On the other hand, slow wire cutting wire cutting electro-corrosion processing has low production efficiency and low yield rate. In the design and production, the method of increasing production and selecting and using is generally adopted in order to achieve the purpose of not affecting the production progress and product quality.

[0007] In the molding process of the coupling ring, the molding process is only suitable for the processing of coupling rings with large dimensions and low precision requirements, and the surface quality is not high

For coupling rings with more exotic structures, smaller sizes, and higher precision requirements, it is no longer possible to use the molding process for molding

[0008] The laser processing method can complete the processing of some tiny parts, but because of the thermal processing method, its thermal effect is large, and it is easy to ablate the tiny parts, and the processing edge will produce a recast layer, which will affect the surface quality of the edge

On the other hand, when small parts undergo high-temperature thermal shock, thermal stress will be generated locally, resulting in deviation of feature size

Images