落錘衝撃試験機援用深絞り成形

概要

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High-speed deep-drawing of aluminium sheets is performed with the aid of a drop hammer. The punch speed is selected as 10m/s and 5 m/s (only for cylindrical cup-drawing) , and for slow operation, 2 x l0-5 m/s. for comparison. The degrees of temper of the sheets adopted are dead-soft (O), half-hard (1/2 H), and hard (H ; as-received). The sheets are 0.3 mm and 0.8 mm thick. The cross-sectional shapes of the punch are circular (flat-headed and hemi-spherical) and square. Over the punch head, melted bees・wax is painted as the best lubricant and rosin resolved in acetone is sprayed as a friction-raiser. It is emphasized that for a thinner sheet, it is disadvantageous to raise the operation-speed. In contrast with this, for a thicker and harder sheet, drawability increases with a higher speed of operation. It is also emphasized that the development of wrinkling is apt to be suppressed in the high-speed operation. Several other interesting results are also presented.
一般社団法人日本機械学会の論文
1988-03-25