因为内螺纹构成约束它阻碍零件从型芯的直接脱模所以内螺纹在内凹孔的广义范围内。
The internal thread comes within the broad definition of an internal undercut in that the thread forms a restriction which prevents the straight draw removal of the molding from the core.
凹模型孔设计有一定圆角，凸模带有侧刃，并采用了可靠的定位等措施有效地控制了六角工件的对角线尺寸。
The diagonal dimension of the hexagon parts is controlled by reliable position setting units, small round corner for female module designing and the male module with lateral sharp edge.
油源对比表明，上二叠统优质烃源岩主要分布于达坂城次凹东北部，其生成的油气沿燕山、喜山期形成的断裂以及上二叠统孔、渗性较好的输导层向西南方向斜坡带的较高部位运移。
Oil and gas generated in the northeastmoved to the southwest, the higher part of the slope through fault and permeable carrier layer, and accumulated in the favorable place of strata and structure.
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