垂直于轴线的裂纹是因为淬火快速冷却时。厚壁处未淬透以及截面尺寸突变产生的弧形裂纹。
Crack perpendicular to the axis is caused on too rapid quench cooling, non-hardenability of the thick-walled department, as well as mutation of cross-section size. This is a typical arc-shaped crack.
上颚壁面呈弧形外突，并在该弧形外突壁面上设有观察窗开口；
The wall of the maxilla protrudes in an arc shape and the wall of the protruding arc surface is provided with an observing port;
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