Research on the Rolling Characteristics with Ultrasonic Oscillation for Hard-to-machine Materials

尽管在切割、冲裁、拉伸等领域中已经部分地进行了将超声波振荡（USO）应用于材料的研究，但是很少有将USO应用于板材轧制的情况。本研究利用超声波对SUS 304、SUS 430、Ti、Al、Cu、超低碳钢（ULCS）和80 kg高强度钢（HT 80）等材料进行了激振轧制，从而阐明了载荷特性和材料表面特性的变化规律。（1）在SUS 304、SUS 430、Ti、Al和HT 80等材料中，证实了减载效应。随着吃水深度的增加，其影响趋势越来越明显。(2)In轧制Cu和ULCS的情况下，没有观察到负荷降低效果。(3)As对于由于 关于我们 条件的变化，在轧制SUS 304的情况下，较厚的板具有较大的影响，较低的轧制速度导致较大的负荷下降。二辊式轧辊/润滑冷轧的特征：由于润滑本身导致的负荷下降是主要因素，没有观察到任何由于USO轧制导致的倍增效应。材料表面分析的结果：在USO轧制前后，表层截面的显微组织和板厚方向的硬度分布都没有观察到差异。表面粗糙度、亮度和不规则度根据各种条件的变化是可以理解的，但没有确认任何恒定的趋势。2.在工作辊上施加USO的情况下，2辊轧机辊/干式冷轧的特性：在轧制ULCS的情况下，观察到与在待轧制的板材上施加USO时所示的相同水平的负荷增量。3.板材振幅的测量：采用激光位移传感器对轧制前的板材进行了振幅测量，结果表明，振幅为3.3 μm时，轧制Al、Cu和ULCS的频率和振幅都较高，SUS的频率和振幅居中，Ti和HT 80的频率和振幅较低。这种倾向的差异似乎在很大程度上取决于软材料或硬材料。少

Although studies on applying an ultrasonic oscillation (USO) to materials have been partly carried out in such fields of cutting, blanking, drawing and so, there have been few cases of utilizing the USO to sheet rolling. In our study, an exciting rolling method, which utilizes the ultrasonic waves, has been developed for materials to be rolled such as SUS304, SUS430, Ti, Al, Cu, ultra low carbon steel (ULCS) and 80kg high tensile strength steel (HT80), and thereby the variations of both load characteristics and material surface characteristics have been clarified.1.Characteristics of 2-high mill roll/dry cold rolling, where the USO being applied to sheet materials :(1) The load decrement effect was confirmed in such materials as SUS304, SUS430, Ti, Al and HT80. The tendency of its effect became more and more conspicuous with increasing a draft. (2)In cases of rolling Cu and ULCS, none of the load decrement effect was observed. (3)As for a magnitude of the load decrement effect due to a … More change of conditions, in case of rolling SUS304, a thicker sheet had a bigger effect and a lower rolling speed caused a greater load decrementsCharacteristics of 2-high mill roll/lubricated cold rolling :The load decrement due to lubrication itself was the main factor, and any multiplier effects due to the USO rolling were not observed.Result of material surface analysis :None of differences were observed both in the microstructures of the surface layer section and in the hardness distributions in the sheet thickness direction before and after the USO rolling. Changes of the surface roughness, brightness and irregularity according to various conditions, were comprehensible, but any constant tendency was not confirmed.2.Characteristics of 2-high mill roll/dry cold rolling, where the USO being applied to the work roll :In case of rolling ULCS, a same level of the load increment as shown when the USO was applied to the sheet material to be rolled, was observed. The roll surface roughness had been greatly changed, and therefore further study on the equipment including any damages to it should be required.3.Measuring of sheet amplitude :According to the results of measuring the sheet materials to be rolled before rolling, with a laser displacement transducer, when the amplitude being set at 3.3 μm, both the frequencies and the amplitudes were higher in cases of rolling Al, Cu and ULCS, medium in case of SUS, and lower in cases of Ti and HT80. The difference in such a tendency seems to depend greatly on a soft or hard material. Less