Research Article
Optimization of Deformation Behaviors during Continuous Forming Extrusion of C18150 Copper Alloy through Response Surface Methodology
Table 6
Estimated regression coefficients for the extrusion load relevance/importance test for C18150.
| Terms | Coefficients | Standard error coefficient | t-value | value |
| Constant | 8490.71 | 194.673 | 43.615 | 0.000 | x1 | 73.75 | 2.885 | 25.567 | 0.000 | x2 | −8.22 | 0.124 | −66.128 | 0.000 | x3 | −23.80 | 0.121 | −196.154 | 0.000 | x4 | −310.00 | 372.869 | −0.831 | 0.422 | | −2.31 | 0.031 | −73.808 | 0.000 | | −0.00 | 0.000 | −35.159 | 0.000 | | 0.00 | 0.000 | 2.743 | 0.018 | | −8000.00 | 200.520 | −39.896 | 0.000 | | 0.01 | 0.001 | 9.933 | 0.000 | | 0.15 | 0.001 | 104.085 | 0.000 | | −126.25 | 2.894 | −43.621 | 0.000 | | 0.00 | 0.000 | 64.783 | 0.000 | | 9.25 | 0.116 | 79.900 | 0.000 | | 22.55 | 0.116 | 194.782 | 0.000 |
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x1, wheel velocity; x2, feedstock temperature; x3, friction factor; x4, die temperature.
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