Abstract
The aim of the study is to establish the actual level of working loads on the roll drive line of the sizing mill installed as part of the PRP-220 with an automatic mill, when switching to the production of steel pipes from increased strength group. The study is based on a complex experimental and theoretical analysis. After the processing of the results of experimental studies a comparison of the most loaded sizing route for a thin-walled pipe with a diameter of 244.5 mm and a wall thickness of 8.9 mm (D/S = 27.5) made of steel of strength group “D” was made with the route for a pipe with a diameter of 177.8 mm and a wall thickness of 9.2 mm (D/S = 19.3) from steel of strength group “E”. Graphs of the observed processes are presented, as well as calculated predictive values of sizing of thin-walled pipes for steel of strength group “E”, obtained on the basis of an experimental-theoretical analysis of the growth of flow stress. Recommendations have been given for improving the equipment of the PRP-220 sizing mill for the production of pipes with increased diameters from steels of increased strength groups.
Highlights
Sizing mills as part of pipe rolling plants perform the process of calibrating the diameter of the rough pipe in several two-roll stands of lengthwise rolling, inclined relative to the horizon at an angle of 45° and turning the plane of the inter-roll gap of each subsequent stand relative to the previous one at an angle of 90° [1, 2]
The object of the study was the main lines of the working stands of a 5-stand sizing mill, which is included in the technological line of the pipe-rolling plant PRP-220 with an automatic mill of JSC “Pervouralsk New Pipe Plant” (PNTZ)
The arrays of digital data obtained in the course of the experimental study were processed with the aim of converting into a form convenient for further visualization of the results, taking into account the calibration coefficients for each of the parameters, as well as for presenting information in the form most convenient for reading, analysis and comparison
Summary
Sizing mills as part of pipe rolling plants perform the process of calibrating the diameter of the rough pipe in several two-roll stands of lengthwise rolling, inclined relative to the horizon at an angle of 45° and turning the plane of the inter-roll gap of each subsequent stand relative to the previous one at an angle of 90° [1, 2]. The object of the study was the main lines of the working stands of a 5-stand sizing mill, which is included in the technological line of the pipe-rolling plant PRP-220 with an automatic mill of JSC “Pervouralsk New Pipe Plant” (PNTZ). This PRP-220 was intended for the production of pipes with a diameter of up to 219 mm, mainly from carbon and low-alloy steels. The grade composition of the steels observed during the work was quite wide carbon, alloyed and corrosion-resistant steels (20, 09G2S, 13HFA, 45, D, 37G2F, 08H18N10T in Russian standarts)
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