B - Operations – Transporting – 21 – J
Patent
B - Operations, Transporting
21
J
78/4
B21J 7/18 (2006.01) B21J 5/12 (2006.01) B21J 9/06 (2006.01) B21K 1/56 (2006.01)
Patent
CA 1176085
P-676 7 F?RENADE FABRIKSVERKEN "Forging blank for an internal threaded cylinder" A b s t r a c t A forging blank for the production of threaded tubes or cylinders by coldforging around an externally threaded mandrel (2), whereby the material in the forging blank is displaced into the mandrel s thread grooves (15). The forging blank is mostly formed with an outer diameter corresponding to the required profile depth of the threads (20) in the final forged cylinder, while the blank at one or more places is formed with thicker or thinner diameters to form thread profiles with increasing and decreasing thread profiles. One form of the invention concerns a forging blank, which at both ends is conically shaped (17) so that starting cones are formed in the forged product. The blank can also be formed with a centrally thickened portion (16) to form one or more threads with a deeper profile, producing a barrier or a locking for rods which are to be screwed into the sleeve. (Figure 2 is recommended for publication)
394850
Forenade Fabriksverken
Smart & Biggar
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