Regression analysis of variation of the drawing radius in the case of using steel tool.
|Lubrication||Initial blankholder pressure||Slope of the regression||Determination coefficient R 2|
|With||1.6 MPa||y = −107.1x + 787.9||0.878|
|Without||y = −103.6x + 819.9||0.867|
|With||3.2 MPa||y = −159.1x + 1086||0.984|
|Without||y = −170.6x + 1176||0.97|
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