中文摘要：

小型缸体由于其零件上各孔尺寸较小，在其上的对中机构无法采用通用机构．文章介绍了针对小型缸体对中机构的国内现状，并针对国内现状开发出一套适用小型缸体的钢珠对中机构．此对中机构具有在环境恶劣、湿式或干式加工等应用场合小尺寸定位准确可靠、使用寿命长的优点，很值的大力推广，有很高的应用价值．

英文摘要：

In the casting of small cylinder, due to low domestic casting technology, deformation will leads to cylinder bore eccentricity error. The article describes the domestic status quo, and develops a set of steel ball aligning guide for small cylinder. The aligning guide is advantageous in its accurate and reliable positioning and long life in harsh environment, wet or dry processing applications. As the problem of cylinder bore eccentricity for small cylinder casting is still not solved in China, this guide is worth promoting.