Patent GB-1221052-A (GB)
Title: Improvements in or relating to tool assemblies for or in presses
Inventor: CLEMENT FREDERICK ARTHUR GLANV
IPC: B21D37/04
Filed: 1966-11-08
Abstract: 1,221,052. Punching. REDMAN ENG. Ltd. 5 Feb., 1968 [8 Nov., 1966], No. 49959/66. Headings B3U and B3W. A tool assembly comprises a support member having two vertically spaced vertical faces, one including a horizontal guide track for locating a plurality of punch parts against vertical movement while allowing horizontal movement relative to the support member and the other forming one limb of an L-shaped horizontal given track for locating a plurality of die parts, and complementary elements on each punch part and on the support member for clamping the punch parts in the desired location on the support member. As shown, Fig. 3, a key 58 on each punch part 55 is located in a groove 52 in the member 49 and is clamped to the member in selected position by screws 56 which are tightened in wedge members 57 located in dovetail grooves 54. Each die part 59 is located against faces 60, 61 and is clamped in selected position by tightening screws 62 in wedge members 63 in a recess 64. Another embodiment, Figs. 1 and 2 (not shown), comprises instead of a key 58 a groove (40) on the punch part (11) which receives a bar (22) located in a groove (21) in the support member (17) which has punch and die parts mounted on two opposite sides and a work-receiving aperture extending between the recesses 54 and 64 from one tool-carrying face to the other. In an alternative die mounting, Fig. 4, for use with punch parts supported similarly to those of Fig. 2, each die part 72 is slidable in a groove 69 and clamped by tightening screws 78 passing through wedge members 76, located between the die part and an abutment member 74, into a T block located in a T groove 80 in the base 66 of the support member. In a modification (Fig. 5, not shown) a support member similar to that of Fig. 3 is in two vertically spaced parts mounted respectively on the upper and lower limbs of two horizontally spaced C frames which are adjustable transversely and fore and aft of the lower bolster of a press. The upper face of the lower bolster forms a face of the die part-locating guide track. The support member parts are secured to enlarged heads on their respective C frame limbs by counter sunk screws located in the dovetail recesses.  For punching closely spaced holes punch and die parts otherwise similar to those of Fig. 2 each house a plurality of punches and dies respectively. Each punch has a stripper including a stripper spring in the form of Bellville washers and a weaker lifter spring. To enable the punches and dies to be aligned the stripper spring may be immobilized as in Specification 1,061,270 or the punch parts may include releasable means for holding the punch in extended position. Alternatively a removable die is temporarily replaced by an elongated bush during alignment or a templet is used. The punches and dies may be suitable for riveting. In riveting apparatus, Fig. 6, not shown, the guide track for the punch parts is shallower but of greater than groove width 52 and the guide track for the die parts is similar to the recess in which member 74 in Fig. 4 seats. The punches may be actuated by the beam or ram of a main press or by a plurality of cams on a shaft. Some at least of the punch parts may be interconnected, by means such as a screw threaded shaft, into one or more sets for simultaneous adjustment on the support member.