定位销孔dowel hole 使模具相邻两部分准确定位而设计的插入定位销的孔，亦称导柱。 不推荐：导柱孔
同时，在四角位置分别对称布置定位销孔，从而使压水 堆燃料组件的安装更加灵活方便。
Meanwhile, the four corners are respectively and symmetrically provided with positioning pin holes, so that the assembly of the pressure water reactor fuel element can be more flexible and convenient.
机筒在五轴加工中心上精密加工，内孔和销孔定位准确，精密度高。
Machine barrels are precisely processed at the Five-ax Machining Center with high accuracy and locations of inner bore and pinhole are nicety.
分析和应用结果表明，造成销孔凸缘裂纹的原因是制造过程中定位误差等引起的冲击力、销孔的凸缘曲线结构不合理及应力三个因素引起的。
The result of the analysis and application show that the crack of pinhole rib is caused by the impact produced by fix error, the unreasonable structure of pinhole rib and internal stress.
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