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分析了无缝铝管固定穿孔针挤压工艺的特点,根据固定穿孔针挤压过程中穿孔受力和挤压行程曲线提出固定针挤压工艺技术路线。介绍了几种不同的固定穿孔针结构形式,提出一种外置液压固定穿孔针新结构,并分析了新结构的优点,给出了采用比例溢流阀和高频响比例阀联合控制的外置液压固定针穿孔系统控制方法。研究结果表明,采用新结构的定针精度可以控制在±1 mm以内。将研究结果应用在125 MN油压双动铝挤压机上并进行大型无缝铝管的挤压实验,得到了实际穿孔针的受力和挤压行程曲线,实验数据和研究结果吻合。
The characteristics of extrusion process of seamless perforated aluminum tube were analyzed. According to the perforation force and extrusion stroke curve of fixed perforated pin, the technical route of fixed pin extrusion was proposed. Introduced several different forms of fixed puncture needle structure and proposed a new structure of the external fixed hydraulic punching needle, and analyzed the advantages of the new structure, given the use of proportional relief valve and high-frequency proportional valve proportional control of the outside Set hydraulic fixed needle perforation system control method. The results show that the accuracy of the needle with the new structure can be controlled within ± 1 mm. The results are applied to the 125 MN hydraulic double-action aluminum extrusion press and the extrusion experiment of the large-scale seamless aluminum tube is carried out. The stress and compression stroke curve of the actual perforated needle are obtained. The experimental data are consistent with the research results.