Under Pressure

Fig. C: Film shows tactile analysis of the curved re-strike operation. Click the image to enlarge.

They also analyzed the dies’ outer four bumper blocks (shown in Figure D), the principal indicators of die parallelism. The film revealed detailed data about differences in pressures across the small sections of bumper block, unlike traditional lead check “distance only” measurements.

Fig. D: Three of the four bumper blocks saw pressure ranges between 7,000 and 20,000 psi. The fourth bumper block didn’t have any contact. A shut height correction was made.

“The test proved that bumper blocks, areas near cutting edges, gradual forms, trim cutting edges and re-strike stations can all be thoroughly analyzed, giving vital information that enables better die balancing,” Graenert says. “Even many heavier (> 0.080” – approx. 2mm) automotive and other stamping and value-added assembly applications are measurable.”

“For some dies, these pressure values, particularly combined with die knowledge, reveal what is ‘unseen’ and allow dies and other mechanical systems to be fine-tuned,” he adds. “This reduces their life cycle maintenance cost and improves part quality and consistency. There are virtually no limits to what this film can reveal in metal stamping.”

Pressurex reveals surface pressure from 2 – 43,200 PSI (0.14 – 3,000 kg/cm2) and is available in eight distinct pressure ranges. The film measures tactile pressure magnitude and distribution in clamps, bolted joints, composites, presses, gaskets, fuel cells, moulds, brakes, valves, heat seals and scores of other applications.
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