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2021-01-24 Views 578

PARTICULARITIES OF METROLOGICAL CONTROL OF NON-CONTACT SYSTEMS FOR MEASURING THE GEOMETRIC DIMENSIONS OF METAL PRODUCTS

O. V. DAINEKO, L. F. KALINOVSKAYA, N. V. BESSEEMONOV     OJSC “BSW–Management Company of the Holding “BMC”, non-contact systems for measuring the outer diameters of products are widely used for measuring geometric dimensions. Diameter measurement systems are used to obtain reliable, true and accurate measurements. The method that provides continuous and non – contact control of these systems is the light -and – dark method of measuring the diameter. To ensure the reliability of the measurement results, the diameter measurement systems must undergo metrological control –calibration. Calibration is carried out according to the developed methodology, which specifies the order of work, requirements for standards, processing of measurement and evaluation results, and registration of calibration results. To assess the extended uncertainty, a mathematical model is created that takes into account all the corrections that affect the result of the assessment, each of which is subjected to a thorough analysis. Calibration of diameter measurement systems allows to evaluate their real deviations in operating conditions, which allows to ensure the accuracy and reliability of measuring the geometric dimensions of metal products at all stages of its production. More...

2021-02-24 Views 583

THE WAYS TO INCREASE THE DURABILITY OF CUTTING TOOLS (SINTERED CARBIDE KNIVES) IN THE PRODUCTION OF STEEL FIBER

M. F. NOVIKOV, YU. I. KOZYREVA      One of the ways to increase the strength and reliability of building structures is the use of steel – fibre reinforced concrete. Steel – fibre reinforced concrete has significant advantages over conventional concrete. A high degree of resistance to cracking contributes to an increase in such physical and mechanical parameters as compressive, tensile and bending strength, water resistance, frost resistance, resistance to water and chemical penetration. In steel – fibre reinforced concrete, steel – fibre is used as a reinforcing material, evenly distributed over the volume of concrete. In the process of steel – fibre production, the fiber is cut with carbide knives. The article deals with the issues of increasing the wear resistance of carbide knives used for cutting steel – fibre, and suggests ways to increase the durability of cutting tools. The influence of the quality of tungsten- cobalt hard alloy on the wear resistance of knives is analyzed, and a knife attachment device is developed. More...

2021-04-24 Views 569

DETERMINATION OF DESTRUCTION CAUSE OF EXPERIMENTAL MILL ROLL OF STAND ROUGHING GROUP OF MILL 150

I. A. GUZOVA, N. A. HODOSOVSKAYA, I. A. KOVALEVA High quality of purchased resources plays a critical role under the conditions of severe international competition. Raw materials, materials and components are purchase for product production and their quality is an essential part in the production of steel at OJSC “BSW – Management Company of the Holding “BMC” holding». The problem of excessively high level of dynamic loads is especially acute for roughing stands. The main reasons for dynamic overloads are intense transient processes occurring in the rolling cycle, the presence of elastic constraints and gaps in the system, imperfection of electric drive system and errors made during development. Therefore, there is a need for selection of material and manufacturing technology for mill rolls capable to withstand such loads for a sufficiently long period. Investigations of destruction causes of experimental mill roll of stand roughing group of mill 150 of section rolling shop at OJSC “BSW – Management Company of the Holding “BMC” holding were carried out. Main classification features are established based on the analysis of the fracture. The results of metallographic studies of microstructure and chemical composition of central and subsurface zone roll fragments are presented. The reason of destruction of experimental mill roll was discovered – nonconformance of roll material grade with the requirements of technological instructions and normative documentation for rough group of stands No. 1–3 More...

2021-06-24 Views 554

ESTABLISHING THE TRUE CAUSES OF DEFECTS TO ENSURE THE QUALITY OF CONTINUOUSLY CAST BILLETS AND HOT-ROLLED PRODUCTS AT ALL STAGES OF THE PROCESS CHAIN AT OJSC “BSW - MANAGEMENT COMPANY OF THE HOLDING “BMC”

A. V. TERESHCHENKO, I. A. KOVALEV      Establishing the true causes of defects is one of the main prerequisites for improving the quality of metal products. One of the undesirable phenomena in the production of continuously cast billets, hot?rolled products is the oxidation of hot metal in the environment with the formation of scale on its surface. Defects, which are violations of the continuity of the metal and deviations from the normal specified macro?and microstructure, significantly reduce the technological plasticity of the metal in the conditions of its processing and operational stability. After hot rolling of a circle of 95 mm steel grade 30MpV4, surface defects were found in the finishing line. To study and establish the nature of surface defects from hot?rolled blanks, as well as continuously cast blanks, samples were taken. Analyzing metallographic studies of defects and the production technology of the studied steel grade 30MnB4, it was found that the defects were formed as a result of mechanical damage to the continuously cast billet in the area of the pulling? correct unit. The reason for the formation of the defect is the ingress of scale on the guide rollers. More...

2021-06-24 Views 590

APPLICATION OF STATISTICAL METHODS IN THE ANALYSIS OF NONCONFORMITIES OF NONCONFORMING PRODUCTS IN THE PRODUCTION PROCESS

N. V. GIRILOVICH, G. V. DOVGOPOLAY      Quality is the degree to which the totality of an object’s inherent characteristics meets the requirements. The product quality control system is a set of interrelated objects and subjects of control, the types, methods and means used to assess the quality of products. An effective control system allows you to make a timely impact on the level of product quality, prevent possible inconsistencies, and ensure their prompt detection at the lowest cost. One of the progressive methods in modern management is the statistical method. The article considers the program element for quality control in OJSC “BSW – Management Company of the Holding “BMC”. This program element is aimed at working with all types of nonconforming products of the enterprise, at finding the root cause and statistical analysis for these reasons More...

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