Experimental study on core mold removal method for electroforming capillaries
Electroforming technology has unique advantages in manufacturing large aspect ratio,ultrafine and high precision metal tubes,and core mold removal is the key process of this technology.The core mold removal after electroforming of large aspect ratio,ultrafine and high-precision metal tubes was investigated.Through experimental research,the mold removal effects of mechanical drawing method,chemical dissolution method and melting method were evaluated.On this basis,a hot pulling mold removal method based on soft nylon wire core mold was developed.The results show that the hot-drawing demolding method based on a soft nylon wire mandrel can quickly remove the mandrel,and there is little damage to the wall of the tube,no residue in the tube.Based on this method,a capillary metal tube with a large aspect ratio and high internal surface quality with an inner diameter of(100±0.5)μm,an outer diameter of(300±0.5)μm,an AR(length-to-diameter ratio)of about 200,and a surface roughness of the inner wall of the tube of 0.364 μm was prepared by electroforming.
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