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改善毛管质量的同时提高穿孔机生产率是钢管生产的主要问题之一。大家知道,毛管的质量和穿孔机的生产率决定了成品管的质量和整个轧管机组的生产率。为了解决这个问题采取了各种途径——特殊的轧辊孔型设计,坯料的强迫送进及加大送进角等。这些途径中,通常认为加大送进角是最合理的。实际上,目前送进角不大于10～11°。从进行穿孔的动力学和运动学条件的观点来看,这么大的送进角可认为是最好的。现在也有这样一种看法:就是认为送进角大于10～12°时,必然使金属相对于轧辊表面的滑移增大、单位能量消耗增加,穿孔过程开始和终了时的条件恶化、工具(轧辊,导板和顶头)的磨损加剧。同时,应当指出,由于多数现有穿孔机结构上的缺点,要送进角调到12°以上实际上是不可能的。莫斯科钢铁合金学院和第一乌拉尔新钢管厂一起在30-102轧管机组的二辊式穿孔
Improve the quality of the capillary while improving the productivity of the piercing machine is one of the main problems in the production of steel pipe. As we all know, the quality of the capillary tube and the productivity of the piercing machine determine the quality of the finished tube and the productivity of the entire tube rolling unit. In order to solve this problem has taken a variety of ways - a special roll pass design, forced feed billet and increase the feed angle. Of these approaches, it is generally considered reasonable to increase the lead-in angle. In fact, the current delivery angle is not greater than 10 ~ 11 °. From the point of view of kinetic and kinematic conditions of perforation, such a large feed angle is considered to be the best. Now there is such a view: that is, when the feed angle is greater than 10 ~ 12 °, the metal will inevitably make the slippage of the metal relative to the roll surface increase, the unit energy consumption increases, the conditions at the beginning and the end of the perforating process deteriorate, , Guides and heads) wear and tear worse. At the same time, it should be pointed out that due to the structural disadvantages of most existing punches, it is practically impossible to feed the angle to 12 ° or more. Moscow Iron and Steel Institute and the first Ural new steel pipe mill together in the 30-102 two-roll perforation machine