METHOD AND DEVICE FOR MANUFACTURING HOLLOW RACK BAR, AND CORE BAR TOOL USED FOR MANUFACTURING HOLLOW RACK BAR

摘要

PROBLEM TO BE SOLVED: To attain a great cut in an equipment cost as well as a replacement parts cost of a method and a device for manufacturing a hollow rack bar, and a core bar tool to be used for manufacturing the hollow rack bar.;SOLUTION: A pipe 1 as a hollow stock is retained by molds 2 and 3, and shuttle storage sheds 7L and 7R are provided on the both ends of the pipe 1. Shuttles 6L1, 6L2, 6L3, ... and shuttles 6R1, 6R2, 6R3, ... are placed in the shuttle storage sheds 7L and 7R respectively and are shiftable vertically. Pushing bars 5L and 5R are placed outside the storage sheds 7L and 7R. The shuttle 6L1 in the left-hand storage shed 7L is forced into the pipe 1 by the pushing bar 5L. Then the shuttle 6R1 in the right-hand storage shed 7R is forced into the pipe 1 by the pushing bar 5R, and the shuttle 6L1 is returned to the storage shed 7L by an interlocking move. After then, the left-hand shuttles and the right-hand shuttles are forced into the pipe 1 alternately while shifts are made between the storage sheds 7L and 7R.;COPYRIGHT: (C)2006,JPO&NCIPI