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振动时效是消减残余应力的有效措施,它有节能、高效无污染的优点。由于高刚度工件的固有频率远远高于现行振动时效设备所能提供的激振频率,导致不能使用振动时效这一方法消减残余应力。为了解决上述问题,提出了基于弯扭耦合理论的新型振动时效方法。首先建立了偏心转子的弯扭耦合振动模型,分析了扭转振动、弯扭振动产生耦合共振的条件,比较了各振型共振振幅的大小。然后综合考虑现有设备所能提供的激励频率和共振产生的动应力,确定了弯扭耦合振动时效的主共振振型和此时的应力分布规律,提出了弯扭耦合振动时效的机理。
Vibration aging is an effective measure to reduce residual stress, it has the advantages of energy saving, high efficiency and pollution. Due to the high natural frequency of the workpiece is much higher than the existing vibration aging equipment can provide excitation frequency, resulting in the use of vibration aging can not be used to reduce the residual stress. In order to solve the above problems, a new method of vibration aging based on the theory of bending-torsion coupling is proposed. Firstly, the torsional-torsional coupled vibration model of eccentric rotor is established. The conditions of torsional vibration and bending-torsional vibration coupling resonance are analyzed, and the resonance amplitude of each mode is compared. Then considering the excitation frequency and the dynamic stress generated by the resonance of the existing equipment, the main resonance mode and the stress distribution at this time are determined, and the mechanism of the bending-torsional coupling vibration aging is proposed.