Method and apparatus for producing hollow rack bar and mandrel used for rack bar production
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United States of America Patent
Stats
-
Jan 30, 2007
Grant Date -
Jan 26, 2006
app pub date -
Sep 27, 2005
filing date -
Jul 20, 2004
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A system for forging a rack bar from a blank pipe. A blank pipe 1 is held between dies 2 and 3. Stockers 7L and 7R are arranged on respective sides of the die set. In the stockers 7L and 7R, left-handed shuttles 6L.sub.1, 6L.sub.2, 6L.sub.3, . . . 6L.sub.n and right-handed shuttles 6R.sub.1, 6R.sub.2, 6R.sub.3 . . . 6R.sub.n are stored. First, a left-handed presser rod 5L inserts the shuttles 6L.sub.1 to the blank pipe from the left-handed stocker 7L. Then, a right-handed presser rod 5R inserts the shuttles 6R.sub.1 to the blank pipe from the right-handed stocker 7R, causing the shuttles 6L.sub.1 to be entrained and returned to the left-handed stocker 7L. Vertical shift movement is alternately executed between the left-handed and right-handed stockers 7L and 7R, so that a shuttle of step-likely increased working height is selected for executing a working process.
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