Journal of the Japan Society for Technology of Plasticity
Online ISSN : 1882-0166
Print ISSN : 0038-1586
ISSN-L : 0038-1586
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Properties of Sheared Surface in Blanking of Steel Plates by PW Dies
Hiroya MURAKAMIYusuke FUJIIHisanobu KANAMARU
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2014 Volume 55 Issue 638 Pages 243-247

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Abstract

In order to develop technologies to produce precision machine parts at low cost and high productivity, precision blanking technologies using a general-purpose press were studied. A PW die, which was expanded from Press Working punch (PW punch) technology, was used for blanking, and a conventional right-angled edge die (RA die) was also used for comparison. Three blanking methods, that is, conventional blanking, blanking with a counterload, and a method of adding an upsetting load, were used in the experiments. The experiments were performed using a 4.4mm- thickness mild steel plate with clearance changed in five steps from 0.42%t to 10.3%t. The main results of this study were as follows. 1) A mirrorlike smooth surface with a high rate shearing surface,such as 95%, was obtained using a ceramic-coated PW die with a minute clearance, under the conditions of conventional blanking and counterload blanking. 2) A gently sloping convex surface, which is desirable for precision machine parts, can be obtained by adding an upsetting load after blanking.

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© 2014 The Japan Society for Technology of Plasticity
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