Development of elongation-controlled mill and its functional products

本研究的目的是开发一种新的轧制技术，通过控制连轧机组的机架间力来实现无尺寸或无材料性能的轧制（伸长控制轧制）。在设计和建造了原型轧机之后，商业金属已经成功地轧制成几个部分。得到的主要结果如下：(1)通过独立控制机架轧辊速度，机架间力由拉伸力转变为压缩力。结果，轧制过程中材料的伸长率（或横向扩展）发生了显著变化。这种效果在具有较小长宽比（宽度/厚度）的材料的情况下更为明显。(2)对于方丝，H-V-H-V-H排列的无套辊，通过机架间力实现产品边长和转角半径的任意组合。(3) h型线材，控制产品肋高。(4)有拉伸间力轧制的材料比有压缩间力轧制的材料具有更高的抗拉强度和硬度。该方法是一种有效的各种产品的无浆料轧制方法。

The objective of this study is to develop a novel rolling technique for size-free or material property-free rolling by controlling interstand forces in tandem rolling mill train (elongation-controlled rolling). After a prototype mill was designed and constructed, commercial metals have been successfully rolled into several sections. The obtained main results are as follows,(1) The interstand forces are changed widely from tensile to compressive by controlling roll speeds of stands independently. As a result, the elongation (or lateral spread) of materials during rolling is changed remarkably. This effect is more obvious in case of materials with smaller aspect ratio (width/thickness).(2) In case of square wires, arbitrary combinations of side length and corner radius of product are achieved with H-V-H-V-H arranged glooveless rolls by interstand force.(3) In case of H-shaped wires, the rib height of product is controlled.(4) Material rolled with tensile interstand forces shows higher tensile strength and hardness than those with compressive ones.The proposed method is concluded to an effective size-free rolling method of various products.