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针对常规的管材液压成形技术需要昂贵的专用设备及模具、生产效率低等不足,开发了一种简单实用、可在冲床或压力机上使用的管材冲击液压成形装置,可用于薄壁金属管材的自然胀形、轴压胀形和异形截面中空件的冲击液压成形。该装置无需外部高压供给系统和专用液压成形设备,通过撞击轴压头挤压容腔中液体的方式来为管材提供液压力和轴压力。通过设计轴压头的行程和调节溢流阀的溢流压力值等来实现最大液压力和轴向进给量的合理匹配,并以304不锈钢毛细管和H65黄铜毛细管为试验管材做了相关试验。研究结果表明:该装置结构简单、操作方便;可实现最大液压力与轴向进给量的协调控制;合理的载荷匹配能显著地提高管材冲击液压成形的成形性能;H65黄铜毛细管破裂时所需的液压力小于304不锈钢毛细管破裂时所需的液压力。
For the conventional pipe hydroforming technology requires expensive special equipment and molds, low production efficiency, the development of a simple and practical, can be used in the punch or press pipe impact hydraulic forming device can be used for thin-walled metal pipe natural Bulging, axial bulging and shaped cross-section hollow parts of the impact of hydroforming. The device eliminates the need for an external high-pressure supply system and dedicated hydroforming equipment to provide tubing with hydraulic and axial pressures by impinging on the shaft ram to squeeze liquid from the reservoir. By designing the stroke of the shaft head and adjusting the overflow pressure value of the relief valve, etc., a reasonable matching of the maximum hydraulic pressure and the axial feed is achieved, and the relevant test is carried out by using the 304 stainless steel capillary and the H65 brass capillary as the test pipe . The results show that the device has the advantages of simple structure, convenient operation, coordinated control of maximum hydraulic pressure and axial feed rate, reasonable load matching can significantly improve the forming performance of the tube impact hydroforming, and when the H65 brass capillary ruptures The required hydraulic pressure is less than the hydraulic pressure required for 304 stainless steel capillary rupture.