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为了选择带有弹性介质的拉延模具的结构,必须对拉延方式进行分析,且进行必要的工艺参数的计算。在带有弹性介质模具上的拉延可按照三种方式实现:用弹性介质作阳模和压板,刚性的阴模;按带有金属压板的刚性阴模,用弹性介质作阳模;按刚性阳模,用弹性介质作阴模。模具用于按第一种方式拉延半球形表面的零件(图1),图中作为阳模的弹性介质是一个紧固到容框中的聚氨酯。阳模环高度由下式确定
In order to select the structure of the drawing die with elastic media, the draw method must be analyzed and the necessary process parameters calculated. Stretching on a die with an elastic medium can be achieved in three ways: with an elastic medium as a male and a pressure plate, as a rigid female die, as a rigid female die with a metal press plate, with an elastic medium as a male die, Male model, with a flexible medium for the negative model. The mold is used to stretch the part of the hemispherical surface in the first way (Figure 1). The elastic medium used as the male mold in the figure is a polyurethane which is fastened to the frame. Male ring height is determined by the following formula