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一、凹模 (一) 整体模整体凹模有结构简单、制造方便的优点,因而目前仍然用得比较广泛,但整体凹模最容易在凹模型腔内拐角处和坯料放入凹模后比上端面低3～4毫米的A处产生横向破裂(见图1)。拐角处破裂的原因是由于工作断面在此处有急变,这就容易引起热处理和挤压时的应力集中,造成模具的损坏。要解决此处的破裂应尽可能加大拐角的R,减小入口角α的角度以降低挤压力。A处的破裂是由于模具工作时产生反
First, the die (a) the overall model overall die has the advantages of simple structure, easy manufacture, and is still used widely, but the overall die cavity most easily in the cavity at the corner and the blank into the die than after The upper end of the low 3 to 4 mm of the lateral rupture (see Figure 1). The reason for the rupture at the corner is that the working section is abruptly changed here, which easily causes the stress concentration during the heat treatment and extrusion and causes the damage to the mold. To solve the rupture here should be as far as possible to increase the corner R, reducing the angle of the entrance angle α to reduce the squeezing force. A rupture is due to the work of the mold counter