Abstract
Stainless steel pipe with fine hole and long size has recently been needed for the flow line of pure gas and liquid, which is used in the field of precision machinery. Inner wall polishing of the capillary is very difficult by ordinary finishing methods. In the present study, new polishing method has been developed, in which polishing is performed by flowing slurry at high velocity through the capillary. The developed machine has been proved to have excellent polishing performance. Experiments show that the surface roughness of as-received stainless steel capillary is reduced from 0.7 μ mRa to about 0.1 μ mRa within several tens of slurry passes. The roughness of finished surfaces decreases with increase in abrasive grain concentration, and with increase in grain size. Optical and scanning electron micrographs of the polished surface indicate that texture pattern of the inner wall disappears in early stage of low pass number. N2 gas flow pressure measurement can be applicable for an estimation of the finishing level.
