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| Знайдено в інших БД: | Реферативна база даних (3) |
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Загальна кількість знайдених документів : 3 Представлено документи з 1 до 3 |
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| 1. | 
Kuvaiev V. M. Dynamic model of interaction of mechanisms on the section between the roll mill stand and the coiler in the process of wire winding by Garrett reel [Електронний ресурс] / V. M. Kuvaiev, D. О. Beshta // Науковий вісник Національного гірничого університету. - 2017. - № 4. - С. 61-66. - Режим доступу: http://nbuv.gov.ua/UJRN/Nvngu_2017_4_11 Purpose. The purpose of the present research is to find ways to manage the coiler-mill drive system, which provides an increase in the tension stability of long products when winding on Garrett-type coiling machines at the output mill-coiler section at a level that does not lead to the extension of the profile in the outlet stand caliber. Methodology. For the purpose of obtaining static and dynamic models of rolling tension at the output mill-coiler section, experimental studies of the winding of long products were carried out. The experimental activities included measuring electrical parameters such as the current of the exhaust cage engine, the current of the pinch roll motor, the speed of the wire feeding machine motor, the current of the coiler motor, the speed of the coiler motor, the position of the coil-laying pipe. The investigations were carried out during the rolling of profiles with a diameter of 16 and 18 mm using a digital recorder "Vizir". Findings. Taking into account the quantitative and qualitative analysis of the results of the study, a general structural scheme was obtained for the rolling-up model in the mode of stabilizing only the amperage of the winder. Dependencies describing the complex of interrelationships between the mechanisms of the output mill-coiler section and the tension and length of the rolling in this site were obtained. A dynamic model for the interaction of the mechanisms of the mill-coiler section during rolling of long products was developed. Originality. For the first time, a dynamic model of the interaction of the mechanisms of the mill-coiler section has been created for rolling coils with a coiler of the Garrett type, which takes into account both the direct and indirect influence of the mechanisms on the coiling process, which makes it possible to search for rational methods for stabilizing the tension of rolled products. Practical value. The above model is a prerequisite for solving the problem of stabilizing the tension of the rolled section of the outlet mill-coiler, which ensures the stabilization of the transverse dimensions of long products when it is coiled by a coiler of the Garrett type. | ||
| 2. |
Beshta O. S. Ulpa particle separa-tion model in a spiral classifier [Електронний ресурс] / O. S. Beshta, V. M. Kuvaiev, I. K. Mladetskyi, M. V. Kuvaiev // Науковий вісник Національного гірничого університету. - 2020. - № 1. - С. 31-35. - Режим доступу: http://nbuv.gov.ua/UJRN/Nvngu_2020_1_7 | ||
| 3. |
Boyko O. Minimization of dynamic changes in the tension of long products behind the outlet cage in rolling stock production in coils [Електронний ресурс] / O. Boyko, V. Kuvaiev, D. Beshta, O. Potap, S. Matsiuk // Naukovyi visnyk Natsionalnoho Hirnychoho Universytetu. - 2022. - № 6. - С. 76-83. - Режим доступу: http://nbuv.gov.ua/UJRN/Nvngu_2022_6_14 Purpose. Justification of technical solutions as to the reduction of the amplitude and reduction of the dynamic change duration in the tension of the rolling stock at the exit of the output cage when moving to winding a new layer to an acceptable level in terms of its effect on the resulting profile of the rolled product through the control of the rotation frequency of an output cage. Methodology. The conducted research was based on a complex model of the process of rolled steel winding with a Garrett-type winder and the tension of rolled steel in the area of the exit cage-winder. To control the actual amount of tension at the output cage exit, it is suggested to use the amount of free deflection of the rolled steel directly behind the cage. The research was carried out by simulating the process of rolled steel winding according to the basic control scheme and control schemes that predict the influence on both drives, i.e. the winder drive and the output cage drive according to the actual value of tension, in various combinations with further analysis and comparison of the obtained results. Findings. It was established that the correction for the deviation of the actual rolling tension in the finishing cage-winder area from the specified value of the winding current of the winder electric drive does not eliminate rolling tension when switching to the next layer winding and the oscillating form of the transition process, which are characteristic of the basic rolling winding scheme. In turn, the correction of the rotation frequency of the output cage rolls drive reduces the amplitude of the roll tension jerk by almost half with a simultaneous reduction in the time of the transition process and readjustment when switching to a new layer winding. Originality. It has been shown for the first time that the introduction of the roll tension control circuit by correcting the high-speed rolling mode of the output cage ensures minimization of dynamic changes in the rolled steel tension when switching to a new layer winding and reduces the probability of local tightening of rolled steel profile. Practical value. The use of the described technical solutions in the control system of the section of rolled products winding of the small-grade wire mill DSDS 250/150-6 PJSC "ArcelorMittal Kryvyi Rih" ensures the improvement of the commercial properties of the winding of rolled products produced on the rolling mill. | ||
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