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Unformatted text preview: wn in Figure 3.c. Two magnetic dial gauge stands are mounted on the punch so that, when the punch moves down, the two dial gauges make contact with the die surface. The dial gauge values are recorded for the lowest punch position when making a bend angle of 90° for 28 samples. Figure 3: Experimental setups for measurement of the position of (a) the back gauges, (b) the punch centre line, and (c) the vertical punch movement. 3.2. Data retrieval and processing method Eleven press brakes, named A to K and installed in different companies, have been used for this study, from which two machines J and K were equipped with devices for inprocess controlling of bend angles. A die with V-opening of 16 mm has been used on all press brakes except on machine A, for which such a die was not available. A V-opening of 12 mm on a die block with several V-openings has been used in this case. To investigate the process-induced errors, a systematic mix of 34 samples, taken from different positions within...
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