Cut the bar tensile specimen from the inner rim part along the tangent direction. The tensile test shall be conducted at the speed of 2 mm/min at room temperature. During the test, the load, displacement and time are recorded electronically. Take 2 samples from each position of different spinning parts for testing to ensure the accuracy of data collection.
The performance of the inner wheel rim of three different forming schemes is compared, as shown in the table.
| Programme | Yield strength/MPa | Tensile strength/MPa | Elongation/% |
| Existing scheme | 210 | 276 | 9.5 |
| A1 scheme | 235 | 308 | 12.3 |
| A2 scheme | 219 | 295 | 10.2 |
It can be seen from the table that compared with the existing forming schemes, the two improved forming schemes can improve the local yield strength, tensile strength and elongation of the inner flange. Slower feed speed can better improve the deformation of the inner rim, that is, A1 forming scheme has better effect on improving the overall mechanical properties of the wheel, and the yield strength, tensile strength and elongation of the inner rim can be increased by more than 10%. The result of this scheme meets the customer’s standard. After the wheel batch road test, the quality improvement effect is obvious.