Open Access

Table 7

Regression analysis of variation of the drawing radius in the case of using bronze tool.

Lubrication Initial blankholder pressure Slope of the regression Determination coefficient R 2
With 1.6 MPa y = −87.9x + 710.2 0.974
Without   y = −82.1x + 742.43 0.983
With 3.2 MPa y = −126.7x + 949.4 0.994
Without   y = −142.8x + 1058.9 0.973

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