Metal deforming – Process – With attenuation – thickening – elongating or shortening of...
Patent
1980-08-26
1983-02-01
Larson, Lowell A.
Metal deforming
Process
With attenuation, thickening, elongating or shortening of...
72356, B21K 502
Patent
active
043708790
ABSTRACT:
The invention is well adapted to the manufacture of water-cooled mandrels for use in a piercing mill. The method of the invention consists in that a cone-shaped cavity is formed in a blank by hot piercing, whereupon the blank thus formed is subjected to hot upset forging whereby it is reduced until its outer diameter at the end of the fitting section is in the range of from 0.9 to 1.02 times the diameter of the mandrel sizing band, the outer diameter of the mandrel working section and that of its nose being 0.9 to 1 times the diameters of the respective sections of the mandrel, the wall thickness in the area of the fitting section and that of the sizing band being from 0.7 to 1 times the thickness of the mandrel wall. Then, the fitting section is subjected to reduction effected concurrently with upset forging of the working section, this followed by final sizing of the mandrel setting cavity. According to one embodiment of the invention, mandrels are formed simultaneously with preshaping of the tapered cavity thereof. Hot upset forging of the blank and presizing of its cavity would result in the increase of its wall thickness, ranging from 1.25 to 2.5 times its original wall thickness. The fitting section of the mandrel is formed with the resultant deformation of its cross section ranging from 1 to 1.5 times.
REFERENCES:
patent: 2167424 (1939-07-01), Novack
patent: 3036367 (1962-05-01), Ricks
patent: 3314278 (1967-04-01), Bergman
patent: 3962897 (1976-06-01), Way et al.
Translation of Article "Commercial Tests of Die-Forged Piercing Mandrels", B. D. Kopysky et al., Vsesoyuzny zaochny mashinostroitelny institut and Dnepropetrovsky truboprokatny zavoid im. Lenina, pp. 55, 56.
Bezzub Grigory I.
Brodsky Viktor M.
Chus Vladimir G.
Dmitriev Viktor D.
Goldenberg Yasha F.
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