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本文通过供应状态的LF6(Y)工业铝合金,用风管的超塑性气胀成形,获得了该材料在超塑性气胀大面积薄壁件时所需的气体压力、温度、时间等工艺参数以及这些参数对成形性能、成形质量的影响,从而得出:大面积簿壁件的超塑性气胀成形气压不宜过大,材料应变速率不宜太快的结论。成形全过程分为自由胀形、宏观胀形、精细成形三个阶段是极为合理的。本文还通过采用45号钢制造成形凹模,在490±5℃的超塑温度下,选用西安油漆总厂新近研制成功的钛合金高温保护涂料对模具进行了防氧化、脱碳的试验。试验结果表面未出现氧化、脱碳现象,而且还具有良好的脱模性能。这比今后超塑成形模具材料的选择具有一定的经济价值和实用意义。本文还通过胀形件的实际测量,得出了供应状态的LF6(Y)工业铝合金超塑气胀成形后其收缩率为0.4％。
In this paper, LF6 (Y) industrial aluminum alloy is supplied with superplasticity and gas expansion of the air duct to obtain the required gas pressure, temperature, time and other process parameters And the influence of these parameters on the formability and forming quality. It is concluded that the pressure of superplastic bulging of large-scale book wall should not be too large, and the material strain rate should not be too fast. Forming the entire process is divided into free bulging, macroscopic bulging, fine forming three stages is extremely reasonable. In this paper, the forming die of 45 # steel was also used to prevent oxidation and decarburization of the mold under the superplastic temperature of 490 ± 5 ℃ by using newly developed titanium alloy high temperature protective coating developed by Xi’an Paint General Factory. The test results showed no surface oxidation, decarbonization, but also has good mold release properties. This than the future choice of superplastic forming mold material has a certain economic value and practical significance. In this paper, the shrinkage of 0.4% of LF6 (Y) industrial aluminum alloy superplastic bulging after forming is obtained by the actual measurement of bulge.