摘要
针对镁合金板材室温拉深性能差的问题,通过分析拉深变形过程中坯料不同部位的应力及摩擦状况,提出采用差温拉深工艺和不同的模具工作表面粗糙度。设计了镁合金差温拉深成形模具。实践表明,与坯料变形区接触的压边圈和凹模部位设置加热系统使其温度控制在（200~235）℃、用循环水冷却凹模筒壁及凸模使传力区保持室温状态,模具凸模表面粗糙度数值为Ra1.6um、凹模和压边圈表面的表面粗糙度数值为Ra0.4um,AZ31B镁合金薄板极限拉深比从2.09提高到3.05。
In order to solve the problem of poor drawing performance of magnesium alloy sheet at ambient temperature,differential temperature drawing process and different mould surface roughness was developed by analyzing the friction and the stress of material in drawing process.And the mold was designed at the same time.The practical test showed that the blank holder contacted with blank deformation zone and die part were set with heating system to control the temperature among（200~235）℃ then recirculating water was supplied to cool the die shell and male die in order to maintain ambient temperature at force transmission area.The value of surface roughness Ra1.6um was adopted for male die,and Ra0.4um was adopted for die and blank holder.The result shows that the deep drawing ratio of AZ31B magnesium alloy can be enhanced from 2.09 to 3.05 by using this equipment apparatus.
出处
《机械设计与制造》
北大核心
2012年第7期259-261,共3页
Machinery Design & Manufacture
关键词
镁合金
差温拉深
模具设计
表面粗糙度
Magnesium Alloy
Differential Temperature Drawing
Mould Design
Surface
