难变形材料轧制实验机开发及实验研究

为满足难变形材料轧制实验研究,开发新型实验轧机.采用液压张力缸和液压夹头夹持短试样,实现直拉张力轧制.采用两台主电机对上下工作辊单独传动和速度调整,实现异步轧制时速度比连续调整.将夹持轧件两端的夹头作为正负极,通低电压大电流,对轧件进行电阻加热,实现温轧功能.利用该新型实验轧机进行验证实验.对3%Si无取向硅钢进行带张力异步轧制,异步比设定为1.12,总压下量增大28.4%.对AZ31镁合金进行带张力温轧实验,厚度由4 mm轧制到0.633 mm,顺利完成轧制并得到很好的表面质量.实验表明,该实验轧机可以作为难变形材料轧制实验研究的有力工具.

Pilot Mill Development for Difficult-to-Deform Materials and Experimental Research

A new pilot mill was developed for the experimental rolling of difficult-to-deform materials. Hydraulic tension cylinders and clamps were used for direct pulling tension rolling on short material specimen. In order to realize the differential speed rolling with continuously variable speed ratio， two main motors were used and the motors’ speeds were adjusted respectively for upper and lower work rolls. Warm rolling process was implemented through strip resistance heating. The clamps at the two sides of the mill were used as the positive and negative electrodes， while low voltage and high current DC power was acted on the strip specimen. These functions were realized on the new pilot mill for experimental validation. The 3% Si silicon steel was rolled with direct pulling tension and differential speed rolling mode. With speed ratio of 1.12， the total thickness reduction was increased by 28.4%. The AZ31 magnesium alloy was rolled with direct pulling tension and warm rolling mode， and the thickness was reduced from 4mm to 0.633mm with good surface quality. This new pilot mill can be used as an effective tool for the difficult-to-deform material experimental research.