针对普通激振方式难以满足难成形零件冷挤压过程的高频率和大激振力需求这一难题，提出将电液高频激振技术应用于金属塑性成形，着重研究高频颤振激励下零件成形过程表面效应及其降低变形抗力的机理等基本科学问题。内容包括：1）分析挤压过程中颤振频率、振幅等主要施振参数对成形面上接触应力、微观摩擦力及其分布等的影响及其规律，进而建立表面效应及其影响因素数学模型；2）探明金属塑性成形过程摩擦力在高频颤振激励表面效应作用下的随动变化规律，建立高频颤振激励下塑性成形摩擦力的宏观描述及其数学模型。3）设计正交试验进行不对称万向节叉塑性成形有限元仿真分析和实验研究，验证高频颤振对降低塑性成形变形抗力的效果，完善表面效应及摩擦力相关理论模型。本项目创新性地将高频颤振技术应用于金属塑性成形加工，研究建立具有一定工程指导意义的理论模型，可解决难成形零件的振动挤压加工基本问题，具有一定的理论研究价值和良好的工程应用前景。

Aiming at the difficult problem that common exciting methods cannot meet the needs for high frequency and large exiting force in complex part forming process, electro-hydraulic vibration tech is adopted in metal plastic forming. The basical scientifical problem of surface effect and its friction-reducing principle under high frequency exciting is emphasized on. The research contents are: 1) Analyse the effect and principle of exciting parameters, such as frequency and amplitude, on surface effect and micro-friction, establish the mathematic model of surface effect and its affecting factors. 2) Obtain the changing principle of friction following the surface effect of metal plastic forming under the high frequency exciting, establishing the macro describe and mathematic model of friction in plastic forming under high frequency exciting. 3) Design the orthogonal table for anisomerous universal node plastic forming FEM simulation and experiments to verify the effect of deforming resistance reducing under high frequency exciting, amend the models of surface effect and forming friction. In this project, the high frequency exciting tech is innovatively applied in metal plastic forming. Theoretical models, which can be instructive in engineering, will be established. This research can solve the basical problem of complex part vibrative forming, and has certain theoretical value and upstanding engineering application foreground.