METHOD OF MANUFACTURE OF SADDLE-SHAPED PERFORATED PARTS FROM SHEET BLANKS

摘要

FIELD: manufacture of sound-absorbing skins of flying vehicles. SUBSTANCE: method is accomplished by means of device containing punch 1 with saddle- shaped working surface and notches, clamps 2 located on either side from punch 1 in parallel with its longitudinal axis, detachable stops 3 and pin 4 mounted in holes 5 of punch 1. Sheet blank 6 is first cut by radii in accordance with mathematical formulae defining the maximum and minimum radii of blank, length of part, maximum radius of part and angle, after which blank 6 is placed on punch 1 and its edges are secured in clamps 2. Edges of blank 6 made according to definite radius which are not secured are placed on stops and are fixed by means of pin 4 mounted in holes 5 of punch 1. Then blank 6 is stretched on punch 1 by moving it upward, after which part is taken off punch 1 and technological margin is cut off. As a result, saddle-shaped part thus manufactured has no displacement in boundaries of perforations and notches relative to sizes specified in drawings. EFFECT: enhanced efficiency. 4 dwg