According to the sheet metal shield the scene actual situation, by examining the torn parts, fracture morphology and crowded degree of injury, thought to cause tearing parts, skewed behavior mainly embodied in the flange forming process, the causes of this process occurs as follows:
1. The flanging forming shenzhen shield design flaws
The double shield for a mould cavity left/right public, due to this process content in addition to the flanging, also have both shape forming content, combined with the special complex parts, curved surface is narrow, the forming requirements concave die core material consistent with the forming surface and so on, lead to shield structure conditions for forming large travel, pressure area is small. Designers in the original design of shielded enclosure, only considered small pressure is expected to face this feature, but neglected the material core forming guide slide stroke.
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