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液压扩孔法或称液压胀形法,是当前变形强化护环的最新工艺。它具有成形精度高、变形和机械性能均匀、残余应力低、模具结构简单和操作方便等优点。本文通过大量的模拟试验确立了液压扩孔法原理,指出使环内液体在变形一开始就达到高压并进行持续的高压喷雾是实现液压扩孔的基本条件,进而导出了正确设计模具形线的理论公式,并总结了影响成形精度的各种因素。提出了降低变形力的一些有效措施。最后简要介绍了上述原理在10万、20万瓩等大型护环生产中获得成功应用的实例。
Hydraulic expansion method or hydraulic bulging method, is the current deformation of the latest technology to strengthen the ring. It has the advantages of high forming precision, uniform deformation and mechanical properties, low residual stress, simple mold structure and convenient operation. In this paper, a large number of simulation experiments established the principle of hydraulic expansion method, pointed out that the ring liquid in the beginning of the deformation to achieve high pressure and continuous high pressure spray is to achieve the basic conditions of hydraulic reaming, and then derive the correct design of the mold line Theoretical formula, and summarizes the various factors that affect the accuracy of forming. Some effective measures to reduce the deformation force are proposed. Finally, a brief introduction of the above principle in 100,000, 200,000 瓩 and other large retaining ring production successfully applied examples.