HCW轧机板形控制机能的研究

应用分割模型影响函数法计算辊系的变形,建立了ＨＣＷ轧机弯辊力ＦＷ、工作辊轴向移动Ｓ与板带材横断面形状的关系的数学模型,结合武钢热轧厂Ｆ４～Ｆ７精轧机改造的实际情况,表明理论分析与生产实践基本一致,证明ＨＣＷ轧机能够自由轧制、提高产品质量和成材率,是现有四辊轧机改造的理想方案之一。     

HCW轧机辊系变形计算机模拟及辊缝控制机理

本文应用计算机仿真的方法,通过对某宽板轧机的计算机模拟分析,找出了HCW轧机在轧辊辊型、弯辊力及工作辊横移量变化时辊缝的状态及变化规律.     

Carcass fat partitioning and meat quality of Alentejana and Barrosã young bulls fed high or low maize silage diets

This study assessed the effect of breed and diet on carcass composition, particularly fat partitioning, and meat quality in young bulls. An experiment with forty young bulls from two phylogenetically distant Portuguese bovine breeds, Alentejana and Barrosã, fed two diets with different maize silage to concentrate ratios, but isoenergetic and isonitrogenous, was carried out until the animals reached 18 months of age. In the longissimus lumborum muscle, Barrosã bulls fed the low silage diet had the highest intramuscular fat (IMF) content. Bulls fed the low silage diet also had the highest IMF content in the semitendinosus muscle. Diet determined the proportions of total visceral fat and individual fat depots. Under these experimental conditions, it was shown that the genetic background is a major determinant of carcass composition and meat quality, and that the dietary differences studied had limited effect on carcass composition.     

Dynamic Model of Gap Loop for HCW Mill

The hydraulic automatic gauge control system using gap loop for cold mill was designed. The stiffness of HCW cold mill was defined for gap loop, and the dynamic model of gauge control system for gap loop was built with mechanism analysis. The stiffness for gap loop and the cylinder displacement loop were measured.     

Roll Gap Crown Adjustment Characteristics of 1700 mm Cold Rolling Mills

The 4-hi cold mill is one of the key wide strip tandem cold rolling mills and has many advantages and characteristics. The mill type is the most important, fundamental and long-term effective factor for the strip shape control. Many advanced mill types such as CVC-4, HCW and PC-4, etc are created based on the conventional four-roll mill. The factors of mill type which affect the deformation of roll system, such as strip width, rolling force, bending force, work roll diameter, backup diameter and so on, arc studied how to affect roll gap crown. It provides a good foundation lbr improving the shape performance of mill.     

Fatty acid composition of adipose tissue and muscle from Jersey steers was affected by finishing diet and tissue location

To determine the impacts of finishing diet and tissue type and location on fatty acid composition and palatability of Jersey beef, twenty steers were assigned to a factorial treatment design with initial weight (Light vs. Heavy) and finishing diet (70 vs. 85% concentrate) as treatments. Ribeye steaks were collected for sensory evaluation. Muscle, seam and subcutaneous (s.c.) fat from steaks, kidney fat (KF) and omental fat (OMF) were collected for fatty acid analysis. Initial weight and finishing diet had little impact on beef palatability. The 85% concentrate decreased polyunsaturated fatty acids (PUFA) in muscle and increased trans fatty acids in all tissues (P < 0.05). The monounsaturated:saturated fatty acid ratio (MUFA:SFA) was highest in s.c. fat, intermediate in muscle and seam fat, and lowest in KF and OMF. The PUFA:SFA was highest in muscle, intermediate in s.c. and seam fat, and lowest in KF and OMF. Fatty acid composition differed greatly among tissues and the lower concentrate diet increased omega-3 and PUFA percentages in muscle.     

水热体系下ZrO_2-SiO_2混合氧化物催化纤维素转化

采用共沉淀法合成了混合氧化物Zr O2-Si O2。用XRD,BET,NH3-TPD对其结构性质进行了表征。在水热条件下利用该催化剂催化纤维素转化。考察了n(Zr)/n(Si)、反应时间、反应温度等因素对纤维素转化的影响。结果表明,Zr O2-Si O2混合氧化物具有较高的酸量,n(Zr)/n(Si)=7时催化剂酸量最高,催化效果最优。反应条件为200℃、2.5 MPa N2、5 min时,纤维素转化率达到59.0%,葡萄糖、乳酸、乙酰丙酸、5-HMF的总收率为26.9%。     

帮助文件的制作

本文通过一个具体的例子讲述了建立帮助文件的详细过程和建立过程中要特别注意的细节。     

CVC-4型冷轧机改造方案的探讨

针对CVC机型在冷轧生产中出现的问题,提出了采用OWB CHCW新机型取代CVC机型的经济型轧机改造方案。该方案首次将辊型优化技术引入机型改造,既消除了原有CVC机型的缺点,又保留了其相关优点,在保证板形控制精度的前提下最大限度地降低了改造成本,缩短了改造周期,非常适合中、小型冷轧企业的机型改造。