论文部分内容阅读
本文对工业用镁合金（主要牌号是ＭＢ３、ＭＢ８等）进行了超塑性等温锻的试验研究。试验 结果表明工业用大晶粒（晶粒度一般１５～２０μ）的变形镁合金在３８０～４２０℃的恒温下，以 １Ｘ １０－３秒－１的慢速压缩变形时呈现出很高的塑性（ε＞９５％）与很低的流动应力（δ＝２～ ３ｋｇｆ／ｍｍ２）为普通锻造的１／２～１／３、并阐述有关工艺参数的确定、润滑剂的选择、模 具及加热装置的设计与制造及压力中心的调整等有关问题。 国内首次实现镁合金超塑性等温锻成形工艺，由于变形抗力大为降低，而塑性又大大提 高，这样就具有设备吨位小、模具小、成型压力小、零件弹性变形小等优点。研究表明为保 证镁合金的机械性能，材料加热时间应限于１．５小时之内。采用良好润滑剂易起模及保证零 件表面质量。 此种工艺最适于薄壁复杂异型零件及低塑性材料的精锻生产。在经济上具有很高的效 益。
In this paper, the industrial magnesium alloy (MB3, MB8, etc.) were superplastic isothermal forging test. The experimental results show that the industrial magnesium alloys with large grains (grain size of 15 ~ 20μ) show high plasticity at a constant compression temperature of 380-420 ℃ at a low speed of 1 × 10-3 sec -1 (Ε> 95%) and low flow stress (δ = 2 ~ 3kgf / mm2) are 1/2 ~ 1/3 for normal forging, and the related parameters of the process, lubricant selection, mold and heating device The design and manufacture and the adjustment of the pressure center and other related issues. The first domestic magnesium alloy superplastic isothermal forging forming process, due to greatly reduced deformation resistance, and plasticity has greatly improved, so that the tonnage of small equipment, small mold, forming pressure is small, the advantages of small elastic deformation. Research shows that in order to ensure the mechanical properties of magnesium alloys, the material heating time should be limited to 1.5 hours. Easy to use a good lubricant and mold parts to ensure the quality of the surface. This kind of craft is most suitable for the precision forging production of thin-wall complex shaped parts and low-plasticity materials. Economically high efficiency.