311 dantan 55

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Unformatted text preview: ded. Another possible error source concerns the positioning of the sheet against the back gauges by the operator and is called the human factor. Therefore, a particular bend line was made in 28 samples without repositioning the back gauges. The lengths of the bend legs were measured on a CMM machine as described in 3.2.f at both ends of the bend lines to analyse this factor. f- Punch positioning. The positioning of the punch in both X and Y directions was explored. The experimental setup to measure the repeatability of the horizontal position of the punch with respect to the die in this direction is shown in Figure 3.b. It uses a dial gauge, as described in 3.2.e, in contact with the punch and a magnetic dial gauge stand that is mounted on the die. The values of the dial gauge were recorded for both the upper and lower positions of the punch when making an angle of 90° for 28 samples. Meanwhile, the repeatability of the vertical punch movement was monitored using the experimental setup sho...
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