Abstract
Small diameter casting rods used VTR cylinder have become a big market in Japan. At the beginning, they were normally manufactured by VDC (Vertical Directchill Casting) process, but recently such merits by HDC (Horizontal Directchill Casting) process as higher recovery, lower equipment cost etc. have been recognized for manufacturing of the rods. Thus, the related studies were performed in our company. HDC process has some characteristic technical problems due to gravity difference between top surface and bottom surface at horizontal portion. Some factors which exert the influence on microstructure as well as surface condition such as casting condition, mould assembly etc. have been discussed in the paper.
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