Abstract

Application of the hot stamping process on heat-treatable aluminum alloys effectively solves the problems of large springback and poor ductility during forming at room temperature, which expands the range of applications of aluminum alloys in the transportation industry. Sheet heating plays an important role in the hot stamping process, and increasing the heating rate can improve the hot stamping efficiency to some extent. In this paper, the feasibility of applying contact heating techniques with higher heating rates in the hot stamping process was studied. A contact heating device was designed, and the temperature distribution of the device contact surface was observed. Furthermore, the heating characteristics of 7075 aluminum alloy sheets during the contact heating process were explored by experiments and finite element simulation. Finally, the rapid solution treatment of aluminum alloy was carried out with a contact heating device, which was compared with the furnace heating solution treatment. The experimental and simulation results indicate that the device contact surface has a relatively uniform temperature distribution, and the aluminum alloy sheets can be heated to close to the set temperature in 15 s using contact heating techniques. Meanwhile, the rapid solution treatment of aluminum alloy sheets can be achieved within 15–20 s by contact heating techniques, obtaining superior mechanical properties. This suggests that the contact heating process can be used for rapid heating and rapid solution treatment of aluminum alloy sheets in hot stamping process.

Highlights

  • The outstanding comprehensive properties of aluminum alloys make it a promising material in promoting lightweighting of automobiles [1,2,3,4]

  • The direct flame impingement heating method was proposed to heat high-strength aluminum alloys by hot gas or flame generated via combustion of fuel, and a heating rate of over 10 ◦ C/s was obtained by DFI on AA6082 sheets of 1.5 mm [29]

  • The existing research on the contact heating technique mainly focuses on heating high-strength steel sheets, and there are few studies on the contact heating process of aluminum alloys

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Summary

Introduction

The outstanding comprehensive properties of aluminum alloys make it a promising material in promoting lightweighting of automobiles [1,2,3,4]. The direct flame impingement heating method was proposed to heat high-strength aluminum alloys by hot gas or flame generated via combustion of fuel, and a heating rate of over 10 ◦ C/s was obtained by DFI on AA6082 sheets of 1.5 mm [29]. The existing research on the contact heating technique mainly focuses on heating high-strength steel sheets, and there are few studies on the contact heating process of aluminum alloys. The contact heating method is characterized by a higher heating rate and is suitable for sheets of different shapes, facilitating industrial application in the hot stamping process of aluminum alloys. It is necessary to study the influence of the rapid heating process (the heating temperature and holding time) on the performance of aluminum alloy, and obtain the best heating conditions for the rapid solution treatment of aluminum alloys. The research on the rapid solution treatment of aluminum alloys by contact heating method was conducted

Contact Heating Device
Experimental
Experimental Method
Simulation
Temperature Distribution of Simulation Model
Contact Heating Process of Aluminum Alloy Sheets
During
Heating
Rapid Solution Treatment of 7075 Aluminum Alloy Sheet
14. Mechanical of 7075 aluminum alloy after rapidheated solutionattreatment with
Conclusions

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