共查询到20条相似文献,搜索用时 46 毫秒
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李小兵 《金属材料与冶金工程》2007,(2):53-55,64
介绍了衡钢φ89分厂钢管锯切工艺要求,重点描述了管排锯切控制系统的硬件构成和软件设计思路以及基于SIMODRIVE 611U位置控制系统在管排锯切控制中的应用. 相似文献
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本文介绍的飞锯控制系统是一种数字直流伺服系统。其数字调节器是按满足锯切工作条件的算式进行运算,并构成位置闭环控制;模拟调节器采用与通常不同的单环结构;低惯量的直流传动电动机由快速可控硅装置供电。对模拟调节系统的分析计算表明,它具有良好的动态品质。工业试验结果表明,本系统能够实现高精度定尺锯切及高生产率。 相似文献
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厚壁无缝钢管在机械、石油、化工等行业应用广泛,传统的切割工艺存在加工效率低、自动化程度低等问题。近年开发的钢管数控仿形锯切技术使用专用锯切设备和锯片,不仅能够快速、精确的锯切大直径ERW焊管,而且在大型厚壁无缝钢管的生产和加工中得到了应用。由于采用了数控仿形锯切的原理,可以使用较小直径的硬质合金齿涂层锯片锯切最大φ720mm×60mm的钢管,适用钢级达到N80以上。经过生产使用证明,厚壁无缝钢管的仿形锯切生产效率高、锯切质量好,工作噪音低,安全性能好。 相似文献
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对1600圆盘式高速金属冷锯机进行了锯切功率的实验研究。对某厂四种有代表性的产品,用不同的进锯速度,实测每种条件下的锯切功率变化,和最大瞬时锯切功率与平均锯切功率之比。并以实测数据为基础,得出每种产品以进锯速度为自变量的平均锯切功率回归公式。这些工作,不仅可以为这种冷锯机锯切功率的理论研究提供依据,还可直接为使用和设计这种冷锯机给出具体参考数据。 相似文献
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通过对锯切装置的改进,提高了锯切性能,降低了锯条成本,保证了锯切质量,使设备更加高效、安全的工作。 相似文献
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针对棒材生产线中多锯组合锯切出现的跟踪定位困难、锯切效率不高等问题,利用西门子step7软件开发了棒材传送功能块和物料跟踪功能块,通过这两个功能块的配合实现了控制辊道间的速度及信息传递。在石钢轧钢锯切生产线实际应用后,系统很好地实现了棒材的跟踪定位控制,提高了锯切效率。 相似文献
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Y O'Connor 《Canadian Metallurgical Quarterly》1993,106(1265):198-201
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CW Cole 《Canadian Metallurgical Quarterly》1997,349(9064):1490-1491
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The recently published 1994 National Earthquake Hazards Reduction Program (NEHRP) provisions include new and substantially improved provisions for the seismic design of nonstructural components, including architectural, mechanical, and electrical components. The provisions are a significant departure from the 1991 NEHRP provisions and other seismic provisions, such as those offered by the 1994 Uniform Building Code (UBC). The design-force provisions are rationally derived and consider actual in-structure acceleration data recorded in recent significant California earthquakes. Also considered in the design-force equations are the dynamic properties of the components, the location of the component within the supporting structure, the safety and operational importance of the component, and the component's anchorage ductility and energy-absorption capability. The resulting force requirements of the new recommendations are compared with the 1991 NEHRP provisions and the 1994 UBC requirements. In addition, explicit design displacement provisions are introduced and discussed. 相似文献
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Benjamin P. Thompson Stuart D. Anderson Jeffrey S. Russell Awad S. Hanna 《Canadian Metallurgical Quarterly》2002,18(3):129-137
This paper presents guidelines for implementing the construction warranty contracting method in the highway construction industry. A logical, step-by-step method for effectively applying the warranty contracting program for use in the highway construction industry is developed. Relevant issues that may present obstacles to the implementation are addressed, while the best practices, compiled from an evaluation of the current industry’s state-of-the-art practices, will assist an interested state highway agency in creating a warranty specification. In performing this research, the current use of warranty specifications among state highway agencies was examined, and an in-depth case study of the Wisconsin Department of Transportation’s warranty program was conducted. 相似文献