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用普通的冲压加工方法成形板材,通常要用一副刚性的凸凹模。如果能用橡皮或液体代替凸模或凹模就可简化模具的结构和制造,带来很多方便。这种方法很古就有了,如人们熟知的橡皮冲压、格林橡皮冲压法等。但这种用橡皮进行加压成形板材的方法由于橡皮变形而产生的压力损失大,而且将足够大压力均匀地传递到棱角处也是困难的。因此,不适合变形程度大和复杂形状的成形。若能用液压代替橡皮就可消除上述缺点,所以人们提出了各种利用液压进行成形的方法。例如液压成形法
With ordinary stamping method of forming plate, usually with a pair of rigid punch and die. If you can use rubber or liquid instead of punch or die can simplify the structure and manufacture of the mold, bringing a lot of convenience. This method is very old there, such as people are well known rubber stamping, Green rubber stamping method. However, this method of press-forming a rubber sheet with a rubber blanket has large pressure loss due to deformation of the rubber sheet and is also difficult to transfer the pressure sufficiently uniformly to the corners. Therefore, not suitable for deformation of large and complex shape forming. If the hydraulic pressure can be used to replace the rubber to eliminate the above shortcomings, so people have proposed a variety of hydraulic forming method. For example, hydroforming