| The work aims to optimize the technological parameters of automobile wheel hub during spinning forming. Four-factor and four-level orthogonal experiment was designed to study the effects of friction coefficient, wheel fillet radius, feed rate, and spindle speed on the wall thickness ratio of the first pass and the second pass. In the first pass, the feed rate range had the greatest effects on the wall thickness ratio, followed by the friction coefficient and the wheel fillet radius. The spindle speed range was the smallest, and had little effect on the wall thickness ratio. In the second pass, the friction coefficient had the greatest effects on the wall thickness ratio, followed by the spindle speed, and finally the wheel fillet radius and feed rate. The optimal process combination of the first pass is A4B4C3D1, that is, the friction coefficient is 0.4, the wheel fillet radius is 25 mm, the feed rate is 0.7 mm/r, and the spindle speed is 150 r/min. The optimal process combination of the second pass is A2B2C4D3, that is, the friction coefficient is 0.2, the wheel fillet radius is 8 mm, the feed rate is 1.4 mm/r, and the spindle speed is 210 r/min. The yield strength and tensile strength of the prepared hub measured at four positions of 0°, 90°, 180° and 270° are similar, respectively, and the mean values correspond to 213 MPa and 263 MPa, indicating that the prepared wheel hub has good mechanical performance uniformity at four positions. |
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