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采用流变间接挤压铸造技术,研究了ZL111铝合金制动泵缸体的成形工艺。通过金相组织观察、拉伸试验、断口分析以及TEM分析等手段,研究了压射比压对铝合金制动泵缸体组织和性能的影响。结果表明,压射比压的增加,消除了铸件因补缩不足而产生的缩松;当压射比压由80MPa增加至95MPa,铸件的显微组织得到了细化,晶粒的平均尺寸由149μm减少至99μm,铸件的抗拉强度和伸长率分别达到了371 MPa和3.17%。
Using rheological indirect extrusion casting technology, research ZL111 aluminum alloy brake pump cylinder forming process. The effects of pressure ratio on the microstructure and mechanical properties of aluminum alloy brake pump cylinder were studied by microstructure observation, tensile test, fracture analysis and TEM analysis. The results show that the increase of injection pressure can eliminate the shrinkage of castings due to insufficient shrinkage. When the pressure ratio increases from 80 MPa to 95 MPa, the microstructure of the castings is refined. The average grain size 149μm to 99μm, the tensile strength and elongation of castings reached 371 MPa and 3.17% respectively.