Research and application of processing technology of cladding-tube with large aspect ratio

In order to meet the requirements of high gain and low noise micro-channel plate, the large aspect ratio cladding-tube was proposed. The geometric uniformity of cladding-tube could be improved by using precision mechanical shaping cold working process, so as to improve the performance of micro-channel plate.

By improving the machining error, tool setting error of machine tool and designing the appropriate mechanical clamping mechanism, the precision of inner circle finishing of cladding-tube could be effectively controlled. The L16 orthogonal test was carried out on the four horizontal factors of grinding head speed, back cutting amount, axial feed speed and emery grinding head particle size. It was concluded that the back cutting rate was the main factor affecting the surface quality of cladding-tube inner circle finish grinding. By selecting the appropriate polishing process and fixture, the size change of cladding-tube was controlled within 1%, and the surface roughness Ra value was effectively controlled within 0.02 μm. The experimental results of manufacturing Φ25/6 micro-channel plate show that the uniformity of micro-channel array, the uniformity of opening area ratio and gain uniformity are improved to a certain extent by reducing the geometric dimension deviation of cladding-tube, which has a good reference for the researchers engaged in manufacturing high-performance micro-channel plates.