空心锻造
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hollow forging 中空锻造 ; 空锻 ; 毛管
extend hollow forging 扩孔锻炼
head flattening for hollow forging 毛管打头
hollow forging thinning 毛管修磨
hollow arbor forging 空锻
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The utility model provides an integral petroleum production tree, which is characterized in that a pipe cross and mutually connected main bars are a hollow and cuboid integral forging piece;
本实用新型提供一种整体式采油气树，其特征是四通和相互连接的主杆为一个空心长方体的整体锻压件；
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