GB1418626A - Tool holder apparatus including the same and its use in the working of metal - Google Patents

Abstract

1418626 Sub press mechanisms BLUE STAR ENG Ltd 4 Dec 1972 [3 Sept 1971] 41300/71 Heading B3W A die set comprises a C frame 1, 2 and a member 3 which slidably engages the limb 1 and, when a spring-loaded pin 6 locks the member 3 and the limb 1 in operative position, supports a die 5, the limb 2 having a passage to receive a punch assembly 4. The punch assembly includes a punch 9, a sleeve 7, a return spring 13 and a polyurethane buffer 10. The pin 6 can be depressed by passing a rod down through a passage 17 in the limb 2. In use, the die set is placed in a press, a template (20), Fig. 3 (not shown), is located about the die 5, and optionally over this of other die sets, and a workpiece positioned on the template by pins (22) is pierced. When irregularly shaped apertures or a number of differently orientated apertures are to be formed, a locating plate (42), Fig. 7 (not shown), is engaged over the head of the punch and the top of a member (45) projecting upwardly from the upper limb. A pin (47) for locating the template projects upwardly from the lower limb. A lateral extension (57) of the punch head (Figs. 8 and 9, not shown) may replace the locating plate (42). In the arrangement of Fig. 11, three die sets 72 and two template clamps 63 are mounted or a bolster 61. A support arm 64 on each clamp can slide longitudinally of the clamp and is mounted on a rotatable portion of the clamp. A disc 65 at one end of each arm 64 comprises three layers, the intermediate layer being of lesser diameter than the other two. A hole in a template 70 fits around the intermediate layer and the top layer both clamps the template to the bolster and acts as a gauging stop for a workpiece 69. For notching the edge of a workpiece Figs. 14-16 (not shown), the clamps of Fig. 11 are arranged with the arms 64 at right angles to the clamp-locating groove 62.