超高强钢管气压热成形设备的研究开发

Development of Thermoforming Equipment with Inner High Atmospheric Pressure for Ultra-strength Steel Pipe

为了满足超高强钢管气压热成形工艺研究的需求,基于高气压热成形原理,轧制技术及连轧自动化国家重点实验室自主设计开发了一套超高强钢管气压热成形设备.该设备利用电阻加热方式对管坯温度进行精确控制,开发了管端部高压密封结构、快速充气系统及液压伺服进给系统;结合模具内部的循环冷却水路设计,高温管件在内高压与轴向进给联合作用下成形,且成形过程中与冷态模具接触被直接淬火,实现了单工位条件下的管件加热、成形及在线淬火功能.实验测试表明,该设备最高充气压力可达40 MPa且密封可靠,温度控制精度为±1℃,管件充气速度连续可调,为超高强钢管气压热成形工艺研究提供了可靠的支持.

A set of thermoforming equipment was developed by State Key Laboratory of Rolling and Automation, based on thermoforming with high inner atmospheric pressure theory, to study thermoforming process of ultra-strength steel pipes. The resistive heating was used to accurately control the temperature of the pipes. The high-pressure sealing structure of pipe ends, rapid inflation system and hydraulic servo system were designed. The heated pipes were shaped under the action of both high inner atmospheric pressure and axial feed. By means of the mold inner loop cooling circuit designed, the pipes touched the cold mold and were quenched directly. Therefore, pipe heating, forming and quenching were finished in single-position. The experiment results show that maximum gas pressure reaches 40MPa with the sealing effect reliable. Temperature control accuracy is ±1℃ and the inflation velocity can be adjusted continuously. The equipment provides reliable support for the research of ultra-strength steel pipe thermoforming process with inner high atmospheric pressure.