**4. Conclusions**

This paper brings new experimental results concerning the effects of a type of cooling on the properties of aluminum alloy using a warm/hot sheet hydroforming process. Warm/hot sheet HDD experimentation was carried out to investigate the effects of different types of cooling on mechanical properties and microstructure evolution of cylindrical cups. The main results obtained in this study can be summarized by the following points below.


**Author Contributions:** D.Z. analyzed the experimental data. G.C. analyzed the date and wrote this paper. C.W. proposed the ideas and reviewed the paper.

**Funding:** This research received no external funding.

**Acknowledgments:** This work was supported by the Zhejiang Provincial Natural Science Foundation (ZJNSF) with Grant No. LQ18E050010 and the Zhejiang Sci-Tech University Research Foundation with Grant No. 17022073-Y.

**Conflicts of Interest:** The authors declare no conflict of interest.
