其中最重要的是确定型芯和型腔的结构，例如是采用整体式还是镶拼式，以及它们的定位和固紧方式。

The among them and most important is a certain type core and the construction of the type, for example adopt the whole the type of type still, and their fixed position and tight way of.

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通过这样的新型结构——在阀芯上增加反馈腔，使其调压偏差不超过10%。

Through the new structure of adding feedback cavity on valve core, adjustment windage is less than 10 percent.

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介绍了铸件内腔表面因树脂砂芯引起的飞翅缺陷，并对其名称和形成机理进行了探讨。

The finning defects on inner surfaces of castings caused by resin sand cores were introduced, their names and definitions were discussed.

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