【摘要】 将剪切低温浇注式半固态流变制浆方法(LSPSF)与直接挤压铸造工艺相衔接,开发了一种浆料制备与零件成形相分离的流变成形系统;在YB32-300型四柱万能液压机上成功进行了铝合金弹壳体(深筒薄壁件)流变挤压铸造试验,并研究了成形件不同部位的显微组织。结果表明,新开发流变成形系统可以解决定量浇注与浆料输送问题,获得表面品质优异的成形件,且工艺流程简单,浆料成形性能良好。由于所受压力分布不均匀,成形件内部不同部位的显微组织存在差距。在零件的横断面,中部固相近球形颗粒数目增多,靠近零件内表面边缘的固相近球形颗粒数目减少,树枝晶数量明显增多。而底部显微组织与半固态浆料成形前的显微组织基本一样。更多还原

【Abstract】 A new rheo-forming method in which the slurry preparation was independent on the component forming was developed by integrating LSPSF(low shearing pouring semi-solid fabrication) with direct squeezing forming method.The rheo-squeezing forming was conducted successfully for aluminum alloy cannonball shells(thin-walled and deep-cylinder parts) using YB32-300 hydraulic presser.The results indicate that the new rheo-squeezing forming system has the features of simple operation and excellent slurry formability,which is beneficial to forming the parts with desirable surface quality due to realize the quantitative pouring and slurry delivery.The microstructure of parts in different position is different due to the uneven pressure distribution on semi-solid slurry.There exists more spherical phase in center and less spherical phase as well as more liquid phase near to the edge of inner surface of the parts on the transverse section.However,the microstructure in the bottom is the same as that of semi-solid before rheo-squeezing casting.更多还原