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在特殊用途的压缩机和泵上,广泛应用直径14～50毫米斜开口活塞环和涨力环。按照技术条件,规定这些环应用在高压条件下应具有均匀的压力图。斜开口环的成型只能依赖于热定型,因为靠模加工以及随后的切斜开口,实际上是很困难的。为保证获得均匀的压力图,从理论上讲,必须用键式热定型具（图a）进行热定型。但是,由于键的宽度小而环的刚性高,将高度较大的小尺寸环h/D>0.05（h、D-分别为环的高度和直径）,安装在键式热定型具上是比较困难的事,因而通常用相应直径的圆杆或圆管（图6）对这种环进行热定型〔1〕。这种情况下得到的环在自由状态下是圆形的,从而作为自由状态下环的成型工序的热定型就失去了意
In special-purpose compressors and pumps, widely used Diameter 14 ~ 50 mm diagonal open piston rings and rings. In accordance with the technical conditions, the provisions of these rings should have a uniform pressure under high pressure conditions. The formation of angled split rings can only rely on heat setting, as it is actually very difficult because of the overmolding and the subsequent diagonal opening. In order to ensure a uniform pressure map, in theory, the heat setting must be done using a key-type heat setting tool (Fig. A). However, since the width of the key is small and the rigidity of the ring is high, mounting the large-size small-sized ring h / D> 0.05 (h, D = height and diameter of the ring, respectively) Difficult to do, so usually with the corresponding diameter rod or tube (Figure 6) of this ring is heat-setting 〔1〕. The ring obtained in this case is circular in a free state, so that it is lost in heat setting as a ring forming process in a free state