Study on Inner Micro-Grooves of Heat Pipe Spinning Process and Multi-Tooth Mandrel
The manufacturing process of micro-grooves inside thin-walled copper heat-pipe is always complicated and difficult. Separately adopted GCr15 and W18Cr4V multi-tooth mandrel, a series of experiments have been done to machine axially inner micro-grooves of micro-heat-pipe with oil-filled steel-ball spinning technology to analyze the mandrel effect and failure mechanism. It was studied how the tooth-shape of multi-tooth mandrel affects the inner micro-groove shape of the copper tube and how the working position of multi-tooth mandrel affects groove-wall surface morphology and groove path. The wear and fracture characteristics of multi-tooth mandrel are introduced. It is proved that the form of GCr15 mandrel failure in machining micro-grooves is tooth-broken or tooth-collapsed, and its service life is short. Differently, the form of W18Cr4V mandrel failure is felt wear, and its service life is long.
Yingxue Yao, Xipeng Xu and Dunwen Zuo
Y. Li et al., "Study on Inner Micro-Grooves of Heat Pipe Spinning Process and Multi-Tooth Mandrel", Key Engineering Materials, Vols. 375-376, pp. 358-363, 2008