GB1075107A - Methods and apparatus for forming blanks - Google Patents

Abstract

1,075,107. Extruding; heading. H. F. PHIPARD. March 25. 1966, No. 13335/66. Headings B3H and B3P. A machine for forming blanks particularly for heading bolt and screw blanks 92c, comprises first and second dies 36, 40 and first and second punches 60, 62 movable relatively towards and away from each other, and means 32 for alternately aligning the first punch 60 with the first die 36 and then the second punch 62 with the first die, whereby a blank is first worked between the first die and first punch, transferred without deformation from the first die into the second punch, transferred by the second punch into alignment with the second die and then further worked between the second die and punch. The punches are mounted in a head 24 slidable transversely on ram 28 by linkage 34; ram 28 is reciprocated by a crankshaft through connecting rod 30. Bar stock 86, Fig. 3 (not shown), is severed by a blade 88 against a clamping element 90 and the cut blank is then transferred opposite the first die 36 into which it is pushed by punch 60 and forwardly extruded into blank 92a, Fig. 5 (not shown). The punches are then moved transversely to bring the second punch 62, opposite die 36, Fig. 7 (not shown), and the extruded blank 92a is pushed by knock-out rod 96 into the punch 62 which is slidable in head 24 and biased forwardly by spring 78. Punch 62 transfers the blank opposite second die 40 where it is upset to form a preliminary head 92b, Fig. 10 (not shown). A third punch 82 is then moved opposite the blank in die 40, Fig. 12 (not shown), and the blank is upset into final shape 92c. A knock-out rod finally ejects the blank. The knock-out rods 96, 106 are actuated by levers 98, 108. In another embodiment, Figs. 13-18 (not shown), for making a round head screw blank, the second die 62d is mounted rigidly in the head 24.