一、前言随着机械工程、工业自动化、军事装备技术的迅速发展,流体传动与控制技术日益深入到现代机械工程的各个领域,以及军事装备中雷达高精度高响应速度跟踪,导弹发射架、火炮高精度定位,飞机、军舰、潜艇的精密液压伺服系统等,使液压技术日益成为各种机械、军事装备的关键性技术。促进液压技术迅速向高压、高性能、高质量,无管集成化方向发 I. INTRODUCTION With the rapid development of mechanical engineering, industrial automation and military equipment technology, fluid transmission and control technology has been deepening into all fields of modern mechanical engineering as well as high precision and high response speed tracking of radar in military equipment, missile launchers and artillery Precision positioning, aircraft, warships, submarine precision hydraulic servo system, so that hydraulic technology has increasingly become a variety of mechanical and military equipment, the key technologies. Promote the rapid development of hydraulic technology to high-pressure, high-performance, high-quality, seamless tube-oriented development