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Wang H.-Y.,Qinhuangdao Shouqin Metal Materials Co Ltd
Kang T'ieh/Iron and Steel | Year: 2013

Contact pressure and its' distribution mode between backup roll and work roll are critical to flatness and service life of rollers. In order to investigate the pressure distribution law and make it more uniform, a thermal-deformation coupled finite element model was setup for wide-thick plate rolling process in a 4100mm mill based on elastic-plastic nonlinear finite element method, and the deformation of both hot plate and rolls was coupled in this model. From the numerical simulation results, the contact pressure distribution and roll gap shape are presented, by which, the backup roll profile curve is optimized to be quadratic and its' shoulder form is improved to be parabolic curve. The service life of backup roll and flatness of plate are improved with the new roll profile. Source

Liu D.,Yanshan University | Ren T.,Yanshan University | Jin X.,Yanshan University | Ma Q.,Qinhuangdao Shouqin Metal Materials Co Ltd
Zhongguo Jixie Gongcheng/China Mechanical Engineering | Year: 2015

A concept of motion integration was presented to improve the efficiency and to reduce the space of series mechanisms. Combining with movable tooth gear and noncircular gear theory, the motion integration mechanism with roller movable tooth was proposed. Firstly, a eccentric circle was selected as the wave generator. A tooth profile model of the inner ring was built under any transmission ratio, with continuous transmission conditions discussed. Then a mathematical relationship in the maximal number of movable teeth, the number of period of transmission ratio and the number of inner ring teeth were studied. When the number of movable teeth was less than two, a parallel movable tooth gear was constructed to realize any speed ratio. Finally, the design process of a motion integration mechanism with roller movable tooth was given to achieve the transmission ratio of series noncircular gear system, which laid the foundation for applying the new gear, and guided the research of other movable tooth gears. © 2016, China Mechanical Engineering Magazine Office. All right reserved. Source

Chu S.L.,Qinhuangdao Shouqin Metal Materials Co Ltd
Advanced Materials Research | Year: 2014

In the course of systematic modeling, the artificial neural networks method is studied. In allusion to the defect of grads descension of traditional back propagation network algorithms, some improving measures have been taken to determine the optimal prediction and analysis model. These measures include adaptive learning, additive momentum, reasonable selection of drive function, and using genetic algorithm to optimize the input parameters. And to learn and predict the utilization of blast furnace production data, better application result is acquired. © (2014) Trans Tech Publications, Switzerland. Source

Tian Y.,Northeastern University China | Li Q.,Qinhuangdao Shouqin Metal Materials Co Ltd | Wang Z.-D.,Northeastern University China | Wang G.-D.,Northeastern University China
Journal of Materials Engineering and Performance | Year: 2015

X70 (steel A) and X80 (steel B) pipeline steels were fabricated by ultra fast cooling (UFC). UFC processing improves not only ultimate tensile strength (UTS), yield strength (YS), yield ratio (YS/UTS), and total elongation of both steels, but also their Charpy absorbed energy (AK) as well. The microstructures of both steels were all composed of quasi polygonal, acicular ferrite (AF), and granular bainite. MA islands (the mixtures of brittle martensite and residual austenite) are more finely dispersed in steel B, and the amount of AF in steel B is much more than that in steel A. The strength of steel B is higher than that of steel A. This is mainly attributed to the effect of the ferrite grain refinement which is resulted from UFC processing. The finely dispersed MA islands not only provide dispersion strengthening, but also reduce loss of impact properties to pipeline steels. UFC produces low-temperature transformation microstructures containing larger amounts of AFs. The presence of AF is a crucial factor in achieving desired mechanical properties for both steels. It is suggested that the toughness of the experimental steel increases with increasing the amount of AF. © 2015, ASM International. Source

Wang Q.-M.,Qinhuangdao Shouqin Metal Materials Co Ltd
Jinshu Rechuli/Heat Treatment of Metals | Year: 2011

Effect of the delay after hot rolling on yield ratio of the test steel microalloyed with Nb were analyzed by means of transmission electron microscope, scanning electron microscope, electron backscatter diffraction(EBSD) and mechanical properties tests. The results show that the delay after hot rolling can increase ferrite grain size, reduce the dislocation density in ferrite grain, affect the lamellar distribution in pearlite colony, increase the thickness of carbide lamellar and also make the yield ratio lower. At 770 °C and 730 °C of delay temperatures, the yield ratios of test steel decrease respectively to 0.738 and 0.724 from 0.765 without delay. When taking into account the general strength requirements, the optimized delay temperature of test steel is (770 ±10) °C. Source

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