These control charts reveal whether production is

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Unformatted text preview: BA According to the analysis on the possible sources of errors, the following factors influencing the accuracy of bend lengths are accounted for. Each factor can contain both random and systematic errors. 1- Workpiece preparation error ∆LU takes into account the inaccuracy of the workpiece preparation process for LU , which is either cutting or previous bending steps. 2- Gauging error ∆G is introduced in the gauging phase, representing the dislocation of the actual gauging position from the ideal one. Considering a single bend, the two main factors influencing the total gauging error are the machine factor ∆G m and the human factor ∆G h . For complex parts, if direct gauging is not possible, the accuracy of gauging is also affected by the cumulative error ∆G j , g of the geometries lying between the current bend line and the gauging line, where j is the first performed bend line adjacent to the current bend line i and g is the effective gauging line, as illustrated in Figure 2.b. Therefore, the total gauging error in X direction, which linearly influences the bend length, can be estima...
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This note was uploaded on 08/03/2010 for the course DD 1234 taught by Professor Zczxc during the Spring '10 term at Magnolia Bible.

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