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分析了平直度控制的信号获取及控制算法机理。平直度信号的获取采用带有压电式传感器的测量辊。控制算法为神经元网络自学习的算法,即输入实测信号根据效率逐一调节执行元件的设定值,以改善板形。 相似文献
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两片罐的拱底形状对于拱底耐压性能影响的研究 总被引：2，自引：0，他引：2
拱底耐压能力是两片罐的一项重要性能指标,通常要求拱底耐压性能达到90psi以上.随着DI材厚度的减薄,拱底耐压性能会下降,因此,需要分析罐底形状对拱底耐压性能的影响,以便于对罐底形状进行设计,提高两片罐的抗拱底翻转能力.本文在对两片罐的拱底失稳过程有限元模拟的基础上,计算出两片罐的拱底失稳压力值,分析了主要的拱底形状参数如拱底直径、拱顶圆弧半径、拱底内侧角等对两片罐拱底抗翻转性能的影响.结果表明,较小的拱底直径和拱底内侧角对于提高拱底抗翻转能力是有利的;适当增大拱顶圆弧,可以一定程度上提高拱底抗失稳能力,但如果拱顶圆弧过大,反而会导致拱底耐压性能的急速下降. 相似文献
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In an effort to reduce the release of fumes containing carcinogenic Cr6+ during arc welding of stainless steel, Cr‐free filler metals for welding of SS304 have been developed. Corrosion studies were carried out on 304L stainless steel samples welded with these Cr‐free consumables. The corrosion properties of gas tungsten arc (GTA) and shielded metal arc (SMA) welds fabricated with Ni? Cu and Ni? Cu? Pd consumables were found to be comparable to those of welds fabricated with SS308L, the standard filler metal used with SS304. Although the breakdown potentials of the welds made using both welding processes were lower than that of the SS308L GTA weld, the repassivation potentials of these welds were much higher. Generally, the repassivation potential is a more conservative measure of susceptibility to localized corrosion. Accordingly, the Ni? Cu and Ni? Cu? Pd welds were more resistant to crevice corrosion than SS308L welds. The addition of a small amount of Pd improved the corrosion resistance relative to Ni? Cu welds, which is consistent with previous studies from specially‐prepared button samples and bead‐on‐plate samples. Other corrosion studies such as creviced and uncreviced long time immersion, atmospheric exposure, and slow strain rate testing suggest that Ni? Cu? Pd filler metal can be a potential replacement for the conventional SS308L filler metal for joining SS304. 相似文献
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介绍了邯钢中型、小型及复二重线材车间一火成材改造的方案,改造后的工艺及设备状况,改造效果及尚存在的问题,并结合存在问题,对各厂今后的改造方向提出初步意见。 相似文献
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热轧型钢过程中经常发生轧辊断裂现象,断裂部位主要在轧辊的孔型处、辊颈处及辊颈与辊身交界处.分析了轧辊产生断裂的原因,认为断辊主要是由轧辊材质热处理回火不充分或存在铸造缺陷、轧辊冷却不良及轧制操作不当引起的,并从技术和管理两个方面提出了相应的控制措施. 相似文献