Pipe sinking drawing is analysed using continuous speed field and the equations of wall thickness variations in sinking drawing established.
利用连续速度场分析了圆管空拔过程，建立了空拔壁厚变化量计算式。
The effects of various amounts of deformation, steel grades, degrees of hardenability, die entry angle and drawing speeds on dia. sinking drawing are studied.
研究了不同变形量、钢种、硬化程度、模角和拔制速度对空拔管直径缩小量的影响。
The formula is therefore considered as available to the calculation of drawing force on tube sinking.
该计算式可用于圆管空拉拔制力计算。
The hollow- sinking of a thin - walled tube is more complicated than the drawing. So far there are few references on it.
薄壁管无芯推压缩径成形过程比薄壁管拉拔成形过程复杂得多，迄今很少有这方面的文献报道。
A kind of new forming technique to manufacture the back spring seat was proposed, called drawing-multi-step sinking with the cylindrical-forming process.
提出了一种生产后簧座的工艺方法：拉深—多步缩口—成形。
Hydraulic drawing-core mechanism was adopted for two-side of inner-sinking in the die casting die, and pre-resetting mechanism was set to avoid the interference of core slide with ejector pin.
压铸件内凹处两侧采用液压抽芯机构抽芯，为防止滑块型芯与推杆发生干涉而设置了预复位机构；
Hydraulic drawing-core mechanism was adopted for two-side of inner-sinking in the die casting die, and pre-resetting mechanism was set to avoid the interference of core slide with ejector pin.
压铸件内凹处两侧采用液压抽芯机构抽芯，为防止滑块型芯与推杆发生干涉而设置了预复位机构；
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