为进一步掌握汽车覆盖件刚度控制机制，建立了以双曲扁壳件为研究模型的成形试验及刚度测试分析系统。分别完成了成形工艺条件中不同压边力、拉深深度条件下，双曲扁壳件的成形试验，5种约束方式下的双曲扁壳件刚度测试试验。分析了压边力、拉深深度和约束方式对刚度的影响规律。研究表明：刚度测试时的约束方式对刚度有重要影响，约束越大，刚度越大；约束的改变对刚度的影响远大于其他工艺条件（压边力和拉深深度）对刚度的影响，提出刚度测试时为准确获得成形工艺条件等对刚度影响的最佳约束方式；工艺条件中压边力及拉深深度的变化对刚度亦有不同程度的影响，刚度随着压边力的增加而增大；成形时的拉深深度越大，刚度值也越大。上述工艺条件的改变对刚度的影响远大于厚度减薄对刚度的影响，在实际生产中，可以通过调整成形时的工艺参数提高汽车覆盖件的刚度。
The experiment models and the test system of siffness analysis for hyperboloid shallow shell automotive body panel parts were established based on. The hyperboloid shallow shells were formed through different process parameters by varying the blank holding force ( BHF) and drawing depth. The stiffness test was performed with five boundary conditions. The relationship of the influences of blank holding force, draw depth and boundary conditions on the stiffness of the parts was also obtained. The results showed that the boundary condition plays an important role in determining the stiffness, i. e. the greater the constraint, the greater the stiffness. The importance of boundary condition on stiffness is greater than that of process parameters. Finally, the optimised boundary condition of the stiffness test was determined. In general, greater blank holding force and draw depth lead to higher stiffness. Moreover, the influence of above mentioned process parameters on the stiffness is much greater than thickness reduction. The process parameters can be adjusted to improve the stiffness of automotive body panel in the actual production. It is expected that this research will provide the theoretical and practical guideline for improving the stiffness of the car body panels.
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