综述了内高压成形设备的组成和功用，阐述了内高压成形机的关键技术-“同步精度”，详细介绍了组合预紧式框架结构、液压同步系统和双液压缸位移同步的PID控制。%This paper reviews the composition and function of hydroforming equipment, describes the key technology of the hydroforming machine: "synchronization accuracy", and details the PID control of combination tightening frame structure, hydraulic synchronization system and dual hydraulic cylinder displacement synchronized.
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