Abstract: Presented Rock complete stress-strain curve and energy terms of rock burst,and the relation-ship between release energy and systematic potential energy in the rock burst is also obtained.
Abstract: physucal-chemistry property of ultra-fine calcinated coal kaolin particle was studied. The reason for ultra-fine calcinated coal kaolin used as basal body of the substitution of titanium dioxide was analysed by the properrty of pigment. The results showed that the properties of high white, high dioptre,low quantity of absorbing linseed oil, high covering ability of ultra-fine calcined coal kaolin are the main reason as the basalbody for the substitution of titanium dioxide. Inaddition,high adsorptive capacity and surface potential of the ultra-fine calcined coal kaolin are beneficial to adsorption of the surface modification ageent on the mineral surface.
Abstract: On the basis of studying the ratio of particle diameter/pipe diameter, turbulence intensity and multi-particle concentration, which influence critical Reynold's number of solid-liquid two-phose flow in vertical pipe, the resulted showed that sharp drop of drag coefficient and higher of particle sinking velocity were presented. In end, a minimum lifting water velocity was given for engineering design.
Abstract: A mathematical model of solidification and heat transfer for Continuous Casting slab is established on the basis of slab caster of Anyang iron & Steel Company. According to the steel grades,the slab section sizes and the casting speed,the control model can adjust secondary spray cooling zone water flow rates.The production application has verified that the water flow for secondary cooling is suitable and the quality of casting slab is good.
Abstract: Average foams life, $\bar τ$ has been presented as criterion to evaluate the foaming behavior in molten slag. Carbonate minerals as foamer, molten salt system of Na2B4O7-CaO-MgO is foamed by the gas from the heat decompostion of the foamer in laborstory. The experimental results show that the particle size and foamer type have effects upon average foams life of slag, and these effects are dependent on the behavior of heat decomposition of carbonate. Within a certain extent, the variation of concentration of CaO and MgO in molten slag both varies the physical properties of melt, and directly influences the decomposition rate and of carbonate and the bubble size of gas from decompositions, so it plays important pole in foaming and foams stability of slag.
Abstract: Based on the Similarity criteria, series water modeling experiments have been carried out to investigate the mechanisms of powder entrapment in the mould of thin slab continuous caster. SG200 hydraulic experiment system was applied to measure the wave amplitude. The main mode of the powder entraps into the steel and the influences of the technique parameter to entrap depth and mode have been obtained.
Abstract: The problems of production logistics balance are researched according to typical iron and Steel production technological process. Models and methods for multiple stages production logistics balance are built, Which are facing the contracts delivery dates and weights. The models can help production management workers to draw up a balanced production plan.
Abstract: The boundary condition of metal deformation at high temperature using experimental and FEM simulation method, and the effect of friction factor on deformation and stress of ring are studied during for-ming process. Through ring compress experiment and FEM simulation analysis, the regularity of friction can be determined and the range of friction factor in metal hot deformation can also be obtained. Maximum coulomb friction factor is around 0.4.
Abstract: The effect of atmosphere on the sintering of CaZrO3/ZrB2 composite has been studied in three kind of atmosphere. Thermodynamic analysis has indicated that at high temperature both CaZrO3 and ZrB2 thermodgnamic relation would be stable only in Ar atmosphere. The experimental results have verified the reliability of the above thermdgnamic analysis.
Abstract: The microstuccture and mechanical properties of high purity hot rolling steel containing single Cu alloying element was investigated, before and after aging annealing. It is shown that the steel has high strengthening effect and high ductility. The precipitation occurred prior to the recrystalization during aging annealing. It is believed that the new steel should have a very positive future.
Abstract: By considering the correlation of the data and the using the clustering technique of pattern recognition, the relationship among various corrosive factors of atmospheric environment has been analyzed. The results of the clustering show that the 21 atmospheric corrosive factors are clustered into five distinct clusters under the correlation coefficient value above 0.54.On the basis of the clustering analysis, the abilities of corrosive factors to distinguish atmospheric corrosivity are assessed, and the main factors are selected. In the generalized space of the main factors, the disposition of the nearest neighbors for the experimental samples are analyzed and the way to predict the atmospheric corrosivity for unknown samples is studied.
Abstract: By testing the cold-rolled extra-low-carbon light gauge sheet samples under different deformation stages and observing them by SEM, their surface pattern and the rules of the transmutation of microstructure has been researched, and the mechanism of the formation of interior holes in gliding fracture was discussed. The result pointed out that it is dislocations' slipping and gathering in original impaired locations but not inclusion and second-phase pericles that is mainly responsible for formation of micro-holes in extra-low-carbon steel.
Abstract: It was studied that the effects of technological parameters on laser welding quality of diamond saw blade and on the composition,microstrure, properties of welded seam. The results showed that satisfactory welding quality dependends on the power, velocity, laser body of laser welding, and it consists of α-Fe and γ-(Fe,Ni) composite.
Abstract: The calculation method of the elongation of the metal strip under tension leveling is discussed in detail on the assumption that the section of the metal strip maintains plain during tension leveling.
Abstract: The effect of back-up roll profile on strip profile and flatness in hot wide strip rolling is analyzed and the stability of profile and flatness(ST) is put forward. The simulating results show that ST is worse to wider strip and is not influenced by other factors.
Abstract: The factors influencing on the machinability of sintered steels made of five kinds of powders with different contents were researched.The test has demonstrated that S and Mn in the ferrous powde can effectively improve the machinability of sintered steels, and the mechanism also has investigated.
Abstract: Reports the experimental investigation on the reliability of gear-tooth bending fatigue strength for 25Cr2MoV ionitriding gear. The tests were carried out on a Electro-magnetic resonance fatigue test ma-chine of type STRON 1 603. The grouping test method at four constant stress levels was applied for short life-span areas while the stress up-and-down test method were used for long life-span areas. The tested data were then Processed with statistic method. Complete C-R-S-N curves were thus fitted and as a result, the values of limits of bending fatigue under various reliabilitys were gained.
Abstract: Reports the experimental investigation on the reliability of gear-tooth bending fatigue strength for 20CrNi2MoA steel gear of carburization-quench hardening.The tests were carried out on a electro-magnetic resonance fatigue test machine of type STRON 1603(U.K). The grouping test method at four constant stress levels was applied for short life-span areas while the stress up-and-down test method were used for long life-span areas. The tested data were then processed with statistic method. Complete C-R-S-N curves were thus fitted and as a result, the values of limits of bending fatigue under various reliabilitys were gained.
Abstract: A method of combining Group Method of Data Handling with phase space theory to predict the condition of complex mechanical system has been built. Compared the tested crankcase pressure of mining truck engine with the predicted results, it has proved tO be an effective method.
Abstract: Based on analysis of three dimension layout of power conductors in DC arc furnace, a arc deflection model is established. According to the model, the arc direction of the DC arc furnace can be control-led. The principle and construction of the direction control system are proposed. The results of simulation re-search shows that arc deflection can be quickly corrected and the arc direction can be freely controlled as re-quired.
Abstract: An intelligent information system for production management of power plant is introduced. It is based on the theories, methods and technologies of intelligent management. The contents include the aim of the system, functions of the system, the construction and the equipment of the system and the software applied in the system. This system is an integrated, intelligent and on-line information system. It illustrates the lntelligent Information System for production management in power plants.
Abstract: In process control system for DC arc furnace steelmaking,modelling is a key part.Because of its complicated mechanism and nonlinearity, it is difficult to model of the process accurately. A genetic neural network algorithm is presented for DC arc furnace steelmaking process modelling and good effects are obtained in its application for real manufacture process modelling.Simulation results with actual process data are presented.
Abstract: The reason for oscillation occurring in the electrical supply system of a hot finishing mill is analyzed. The simulation results qualitatively show that either diminishing the capacity of var compensation systems in the electrical supply system or a band-passing filter (BPF) to be connected into the control system of the mill is capable damping the oscillation. The feasibility of the reconstructed two-loop control system is also analyzed tentatively.
Abstract: In continuous casting process, because mould bath level can be easily affected by many complex and uncertain factors and difficult to control, a new structure-varied fuzzy controller is proposed. In this controller, a state pattern recognition method based on an improved adjustable clustering algorithm,dual-ISODATA algorithm is used. At the fuzzy controller,quantity and the content of the fuzzy rule and mumbership function are optimized by the Genetic Algorithms. The reasoning speed and the robustness of the control systems is greatly improved.The results of the simulation are satisfactory.
Abstract: A kind of LonWorks Node based on Neuron chip was developed for EIA RS-232-C/RS-485signal. The node actually works as a gateway between RS-232-C/RS-485 standard and LonTalk protocol.
Abstract: Determination results on semigroup and evolution system in reference[3] are randomized. And the results are used to get a existence-unique theorem of solotion for a kind of random evoution equation.
Monthly, started in 1955 Supervising institution：Ministry of Education Sponsoring Institution：University of Science and Technology Beijing Editorial office：Editorial Department of Chinese Journal of Engineering Publisher：Science Press Chairperson：Ren-shu Yang Editor-in-Chief：Ai-xiang Wu ISSN 2095-9389CN 2095-9389
