Open Access

Table 4

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

Lubrication Initial blankholder pressure Slope of the regression Determination coefficient R 2
With 1.6 MPa y = −44.2x + 554.9 0.923
Without   y = −45.7x + 601.3 0.973
With 3.2 MPa y = −53.2x + 731.9 0.991
Without   y = −56.4x + 796.8 0.984

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