Latest ArticlesIn this paper, the mechanical properties of U75V heat treated rail were tested in accordance with the Russian standard ГОСТ Р 51685-2013. The results showed that the tensile property of rail after tempering could meet requirements of the Russian standard ОТ350HH for low temperature resistant rail and impact performance is lower than standard requirements. This is mainly because the chemical composition and heat treatment process of steel are different.
In order to improve the performances of low-alloy high-strength hot rolled H beam product of Baotou Steel, reduce its production costs, enhance its product competitiveness as well as improve the economic benefits and production efficiency of enterprise, its characteristics such as the production technology, microstructure and performance are analyzed in this paper. The cost of alloy in steel is reduced and product profit is increased through the design idea of replacing vanadium with niobium and reducing Mn so that its mechanical properties are ensured to meet product standards.
In the paper, the causes of cracks are analyzed and measures for reducing crack rate are put forward aiming at the longitudinal cracks along web on the surface of finished product, the low cost Q355B containing Ti, produced with beam blank by Baotou Steel. The results showed that the cracks were caused by small cracks on continuous casting billet, which grew and formed in rolling process, the longitudinal cracks could be significantly reduced and crack rate of finished product could be reduced to less than 3% by the reasonable matching of casting speed and tundish temperature.
The round steel for sucker rod is with high strength and corrosion resistance. The 30CrMoARE round steel with rare earth for sucker rod is successfully developed through adopting ladle furnace to feed rare earth wire, effectively controlling the content of such impurity elements as S and P as well as reasonably controlling rolling technology. The inclusions of product≤grade 1, yield strength≥1 027 MPa, tensile strength≥1 087 MPa, elongation≥14% and impact toughness≥144 J so that all the performance indexes could meet user requirements.
It is proposed to discriminate working conditions of rolling bearing with Hilbert envelope demodulation in consideration of the fault diagnosis involving such disciplines as machinery, signal processing, advanced mathematics and vibration as well as combining with the working conditions of field equipment and specific circumstances of spot check personnel. The practicability and effectiveness of the method in fault diagnosis for rolling bearing of speed increasing machine for rolling mill are verified through analyzing field data with the intelligent point detector encapsulated with Hilbert envelope demodulation circuit.
A considerable number of liability accidents in the railway transportation of metallurgy enterprises are due to the interruption of diesel locomotive driver's lookout and operation without obeying the regulations resulting in slipping of locomotive. In the paper, it is introduced the vigilance device suitable for installation and use of diesel locomotive to prevent slipping and interruption of lookout is developed by analyzing and researching the control circuit and operating characteristics of GK0 diesel locomotive as well as the expected effects are achieved through tests and applications.
The vibration signal of rolling bearing on the driving side of dust-removing fan of Iron-making Plant is with such characteristics as strong nonlinearity and modulation due to it is in service in the harsh environment of high temperature, high humidity and much dust as well as the complex working condition of strong background noise so that its fault character frequency is difficult to be extracted and identified. With the variational mode decomposition (VMD) and maximum correlated kurtosis deconvolution (MCKD), the noise reduction and extraction of fault character frequency for vibration signal of rolling bearing for dust-removing fan are realized as well as the fault identification is completed by envelope demodulation.
As the important data of consumption and output in production process of iron and steel, energy data affects the input and income in production process of iron and steel enterprises as well as the reasonable distribution and supply, optimal consumption and minimum emission of these dynamic medium can be achieved with it. In view of the shortcomings of existing energy system, the more advanced Nari system is used to upgrade and build an intelligent energy measurement system to meet the current manufacture requirements.
The environment of production site in industrial enterprises is complex and dangerous, so operating personnel is required to wear labour protection appliance to ensure to be protected against personal injury in the operation process. In this paper, a detection system for personnel to wear labour protection appliance based on deep learning is designed to detect such objects as the personnel, safety helmet and CO alarm apparatus in the image as well as normalize the inference algorithm of wearing based on the deep learning object detection model so that the automatic identification of wearing labor protection appliance for operating personnel is realized and the accuracy rate is over 90%.
The structure and working principle of rotary oil feeder for coiler are introduced, the causes for its oil leakage are analyzed as well as its pipeline is optimized aiming at the problem of oil leakage. The practices prove that the problem of oil leakage of rotary oil feeder for coiler is effectively solved with optimization.
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