Metal deforming – By extruding through orifice – Expressing non-uniform cross-section or non-linear product
Patent
1999-10-07
2000-12-05
Tolan, Ed
Metal deforming
By extruding through orifice
Expressing non-uniform cross-section or non-linear product
72264, 72266, 7237001, 7237014, 7237023, B21C 2508
Patent
active
061550922
ABSTRACT:
Apparatus for and method of extruding a metal pipe having a uniform inner diameter, and forward and rearward end sections which are thicker than the middle section of the pipe. A metal billet having a bore is inserted into an open ended cylindrical bore of a stationary container. The billet is moved axially within the bore of the container by a press which includes a pressing surface and a mandrel extending forwardly from the pressing surface through the bore of toward the billet. The mandrel has a cylindrical large diameter rearward portion, a cylindrical small diameter middle portion and a forwardly and outwardly tapering forward portion. Metal from the billet is forced through the small diameter bore of a two part removable first die around the middle portion of the mandrel by moving the press forwardly for a first distance to form a preliminary forward end section of pipe. The press is moved forwardly for a second distance for forcing metal from the billet through the bore of the first die around the rearward portion of the mandrel for extruding the middle section of pipe and causing the preliminary forward end section of pipe to pass over the tapered forward portion of the mandrel to form the forward end section of pipe. The press is moved forwardly for a third distance for forcing metal from the billet through the relatively large bore of a second die around the rearward portion of the mandrel to form the rearward end section of pipe.
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IPEA/EP PCT International Search Report--Appl. No. PCT/US99/23618, Mailed Feb. 15, 2000.
Tolan Ed
Wyman-Gordon Company
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