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在钢管与拔模和芯棒接触表面上造成不同的流体动力摩擦条件下,用长活动芯棒和短固定芯棒拔管时,通过对各种应力和允许变形的比较分析和计算的结果证明:用长活动芯棒拔制时,只在钢管经拔模的接触表面上造成流体动力摩擦条件;
Under the condition of different hydrodynamic friction caused by the contact between the steel pipe and the mandrel and the mandrel, the results of comparative analysis and calculation of various stresses and allowable deformations when the mandrel is pulled with the long mandrel and the short mandrel are proved : Long mandrel pulling system, only in the steel surface of the contact surface by pulling the hydrodynamic friction conditions;