GB190525348A - Process for Producing Seamless Hollow Metallic Vessels. - Google Patents

Abstract

25,348. Gault, J. H. Dec. 6. Stamping. - In the manufacture of metallic hollow-ware of varying outline, a disk of metal is cupped in dies in successive stages, the blank being driven not right through the die so that a flange c, Fig. 9, is left. When the disk is cupped to the requisite extent, a circumferential groove is made by a concave die 31 and a three-part die 30, Fig. 10. A split ring 45, Fig. 12, preferably of leather, is then inserted into the blank to prevent distortion, and the blank is necked in dies 40, 41, 42, thus attaining the form shown in the Figure. The top portion is suitably shaped if the article to be made is a jug, and the blank is then finished by stamping in a two-part die 70, Fig. 14, the pressure of the tool being transmitted through clay or other material. The operation shown in Fig. 12 is performed in the apparatus shown in Fig. 16 in which the dies 40, 41 are held together against springs by levers 57 and straps 56. As the inner die 42, Fig. 12, rises, a roller 65 is made to move along a slot in the machine framework and to assume the position shown in dotted lines, thus opening the die and enabling the blank to be withdrawn.