理论分析和试验研究表明 ,采用不同的激振频率对金属型铸件进行振动凝固时 ,由于铸型系统的各部分位移振幅不同 ,铸件的铸造残余应力水平不同。其中采用铸型系统的低阶固有频率时 ,铸造残余应力水平最低 ,可免于时效处理 Theoretical analysis and experimental studies show that when different excitation frequencies are used to vibrate and solidify the metal castings, the casting residual stresses are different due to the different displacement amplitude of each part of the casting system. Which uses the low-end natural frequency of the mold system, the casting residual stress level is the lowest, can be from aging treatment