Dished ends, also known as beveled spherical caps, are composed of a spherical surface, a straight cylindrical edge at a certain height, and a transition section connecting the two, with a curvature radius much smaller than the spherical radius. Dished ends form a continuous curved surface, and there is a sudden change in the meridian curvature radius at the junction of the three parts, resulting in bending stress due to the curvature change. The combined effect of bending and tensile stress makes this section's stress stand out compared to others. Compared to elliptical caps, the stress distribution is less uniform, but they are easier to process, making them less ideal for engineering applications. However, they are used as a substitute for elliptical caps when模具加工椭圆形封 head is difficult.