在开式锻模中生产的模锻件,均带有横向飞边。飞边的切除是在切边模中进行的,其凹模的结构形式如图所1示。在图1所示的三种形式中,形式Ⅰ被广泛采用,因为它增加了刃部强度和便于翻新,但刃口不太锋利,也不省力。形式Ⅱ、Ⅲ的刃口较锋利,便于切边,但磨损后内孔尺寸增大,需用堆焊方法来翻新,翻新工艺较复杂。因此,上述三种形式的切边凹模各有利弊。 Die forgings produced in an open forging die, both with horizontal flash. The removal of the burrs is carried out in the trimming die, the structure of which is shown in the figure. Of the three forms shown in FIG. 1, Form I is widely used because it increases edge strength and facilitates refurbishment, but the edge is less sharp and less labor intensive. Form Ⅱ, Ⅲ edge sharp, easy to trimming, but the wear hole size increases, the need to use surfacing method to refurbish, renovation process is more complicated. Therefore, the three types of trimming die each have their own advantages and disadvantages.