GB544656A - Improvements in or relating to cutting dies or methods of making the same - Google Patents

Abstract

544,656. Cutting dies. UNITED SHOE MACHINERY CORPORATION. Oct. 21, 1940, No. 15507. Convention date, Oct. 23, 1939. [Class 31 (i)] [Also in Group XXII] In making cutting dies, particularly dies for cutting shoe part blanks as described in Specification 465,107, having a shaped core member round the periphery of which a laterally flanged blade strip is bent, bending is effected about a corner portion of the core member of such sharpness as to cause looping of the flange away from the core and the loop is then flattened to form a continuous flange at the corner portion of the die. The blade strip 12 which may have double cutting edges 14, 16 and a pair of flanges 18 to engage opposite surfaces of the core member 10, is bent round the core member and finally secured thereto by a series of spot welds. Bending at a sharp corner is effected between a U-shaped support 36 and a tool provided with a tapered head 24 having nose portions 26, 27 engaging the blade at opposite sides of the flanges, and being recessed at 28, 30, to provide clearance for the the flanges. The head also has a slot 32 for receiving the edge of the core member and a guide 34 to enter the space between the flanges. When the tool is moved relatively to the member 36 to force the blade into the recess 38 as shown in Fig. 2, loops 40 form in the flanges. The bending about the corner is then completed. Prior to starting the bend at the corner the flange is secured to the core at 42 by a spot weld and a second spot weld is effected at 44 after completion of the corner bend. The loops 40 are flattened out at 43 between a pair of welding electrodes.