AA5083管件颗粒介质非均匀内压温热胀形工艺性能解析

Analyses of AA5083 Tube Warm Bulging Processes under Non-uniform Pressures of Granule Medium

基于管件热单向拉伸试验、颗粒介质传压性能试验和外摩擦因数试验,分析了采用温热颗粒介质压力成形工艺时,在非均匀内压下AA5083管材自由胀形区的受力情况,探讨了颗粒介质与管件内壁摩擦作用对管件胀形区壁厚分布和胀形极限的影响。理论分析和工艺试验表明,温热颗粒介质压力成形工艺中颗粒介质与管坯之间存在的有益摩擦有效抑制了管件减薄,提高了管件胀形极限。

The influences of friction at the tube/granule interface on the thickness distribution of free bulging region and the bulging limitation were discussed based on uniaxial tensile tests at elevated temperature for AA5083 tube, the pressure-transfer tests and the external friction coefficient tests for granule medium after the force conditions of free bulging region were analyzed under non-uniform internal pressures. The theoretical analyses and tests show that friction at the tube/granule interface is beneficial for preventing the thickness decrease and improving bulging limitation.