利用上界法推导了冷拔内螺旋凸筋管拔制力计算式。
The formulas of drawing force for spiral internal-ribbed pipe cold-drawing are derived with upperbound method.
实验表明，理论计算值与实测值较吻合，可为冷拔内螺旋凸筋管的拔制设备选型提供理论依据。
The experiment result shows that the theoretical values are close to those measured, which provides a theoretical basis for internal-ribbed pipe cold-drawing equipment type selecting.
在某些情况下，把一个螺旋形进一步分解成凸子集是必要的。
In certain case it might be necessary to further decompose a spiral into convex subsets.
其成型设备包括：电机、皮带轮、螺旋绞龙推进器、料斗、活塞驱动系统、活塞、锥模、凸模、法兰、机座、推杆、成型筒等。
The forming apparatus includes motor, belt wheel, spiral propeller, material bin, piston driving system, piston, mold, pedestal, forming barrel and other parts.
板式盘管或螺旋管是由两片有对应凹槽的平板或凸、凹板对压成型的。
The plate type coiled pipe or spiral pipe is molded by two flat plates with corresponding grooves or a convex and a concave plates which are oppositely pressed.
为了真实重现受害人的3维容颜，提出了一种基于螺旋CT的3维颅骨重建影像的3维凸包软组织厚度计算方法。
In order to reconstruct 3D appearance truly, a new method of calculating parenchyma thickness is put forward in this paper. It is mainly based on convhull method with spire CT.
为了真实重现受害人的3维容颜，提出了一种基于螺旋CT的3维颅骨重建影像的3维凸包软组织厚度计算方法。
In order to reconstruct 3D appearance truly, a new method of calculating parenchyma thickness is put forward in this paper. It is mainly based on convhull method with spire CT.
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