Research Article
Forming Parameters on Friction during Single Point Incremental Forming
Table 5
Variance result of friction coefficient.
| | Variance source | Sum of squares (SS) | Free degree | Mean square value (MS) | F value | value prob > F |
| | Model | 0.21 | 20 | 0.010 | 16.00 | 0.0001 significant | | A, tool diameter | 0.072 | 1 | 0.072 | 111.82 | <0.0001 | | B, layer feed | 0.035 | 1 | 0.035 | 53.36 | <0.0001 | | C, spindle speed | 0.010 | 1 | 0.010 | 15.58 | 0.0006 | | D, feed speed | 0.017 | 1 | 0.017 | 26.07 | <0.0001 | | E, forming angle | 0.022 | 1 | 0.022 | 33.90 | <0.0001 | | AB | 8.410 × 10−4 | 1 | 8.410 × 10−4 | 1.30 | 0.2655 | | AC | 5.625 × 10−5 | 1 | 5.625 × 10−5 | 0.087 | 0.7708 | | AD | 9.000 × 10−6 | 1 | 9.000 × 10−6 | 0.014 | 0.9072 | | AE | 6.760 × 10−4 | 1 | 6.760 × 10−4 | 1.04 | 0.3170 | | BC | 5.062 × 10−4 | 1 | 5.062 × 10−4 | 0.78 | 0.3853 | | BD | 6.006 × 10−3 | 1 | 6.006 × 10−3 | 9.26 | 0.0054 | | BE | 6.561 × 10−3 | 1 | 6.561 × 10−3 | 10.12 | 0.0039 | | CD | 2.723 × 10−4 | 1 | 2.723 × 10−4 | 0.42 | 0.5229 | | CE | 2.025 × 10−5 | 1 | 2.025 × 10−5 | 0.031 | 0.8611 | | DE | 5.776 × 10−3 | 1 | 5.776 × 10−3 | 8.91 | 0.0063 | | A2 | 0.025 | 1 | 0.025 | 38.32 | <0.0001 | | B2 | 2.913 × 10−3 | 1 | 2.913 × 10−3 | 4.49 | 0.0441 | | C2 | 6.023 × 10−3 | 1 | 6.023 × 10−3 | 9.29 | 0.0054 | | D2 | 2.580 × 10−−4 | 1 | 2.580 × 10−4 | 0.40 | 0.5339 | | E2 | 2.364 × 10−5 | 1 | 2.364 × 10−5 | 0.036 | 0.8501 | | Residual | 0.016 | 25 | 6.483 × 10−4 | | | | Lack-of-fit | 0.014 | 20 | 7.088 × 10−4 | 1.74 | 0.2803
Not significant | | Pure error | 2.032 × 10−3 | 5 | 4.064 × 10−4 | | | | Cor total | 0.22 | 45 | | | |
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