The hands of the rolling mill operator

Metallurgist ◽  
1963 ◽  
Vol 7 (7) ◽  
pp. 324-325
Author(s):  
A. Sergienko
Keyword(s):  
Rolling Mill ◽  
Mill Operator ◽  
Rolling Mill Operator

Evaluation of sex hormones state in female workers of mechanical rubber production

2019 ◽  
pp. 45-49
Author(s):  
Marina A. Zemlianova ◽  
Yuliya V. Koldibekova ◽  
Tatiyana V. Nurislamova ◽  
Evgeniya I. Chumak
Keyword(s):  
Sex Hormones ◽  
Rolling Mill ◽  
Reference Group ◽  
Serum Levels ◽  
Lower Serum ◽  
Rubber Mixture ◽  
Mill Operator ◽  
Female Workers ◽  
Rolling Mill Operator ◽  
Machine Operator

Occupational conditions of female workers engaged into main occupations of mechanical rubber production (rubber mixing machine operator, rubber mixture rolling-mill operator) are characterized by hazardous combined influence of chemical and physical factors of occupational environment: acrylonitrile vapors, occupational noise, vibration. Equivalent noise levels exceed maximally allowable level up to 22 dBA (MAL<80 dBA); the work conditions are assigned to hazardous (class 3.1– 3.3). The air at workplace of rubber mixing machine operator and rubber mixture rolling-mill operator demonstrate 5.5 times increased acrylonitrile level, if compared to the one in a reference group. Female workers of the main group demonstrated dysbalance of sex hormones: up to 2.0 times increased serum levels 17-OH-progesterone, prolactin and estradiol and 1.3 times lower serum FSH, when compared to the same serum levels in female workers of the reference group. Higher serum level of 17-OH-progesterone and lower serum FSH appeared to have high (EF=54.12%) and extremely high (EF=78.74%) degree of occupational conditionality.

scholarly journals Psychological Provision of Processes Modernization of Metallurgical Production Management

2019 ◽  
Vol 8 (4) ◽  
pp. 115-121 ◽  
Keyword(s):  
Rolling Mill ◽  
Production Management ◽  
System Development ◽  
Experimental Methods ◽  
Economic Market ◽  
Metallurgical Production ◽  
Theoretical System ◽  
Management Processes ◽  
Rolling Mill Operator ◽  
Machine Systems

The article presents the results of processes ergonomic modernization of metallurgical production management were discussed in two countries under new economic (market) conditions. The factors, which define the tension in rolling-mill operator`s activity, were exposed. Some recommendations on modernization of the existing technology and labor organization were formulated. An analytical model of the organization of the research works devoted to the ergonomic modernization of man-machine systems was developed. Searching and purpose-oriented investigations on the different stages of man-machine system development and exploitation were modelled from the sketchy projection till the exploitation of the system. Theoretical, system analytical and experimental methods were used. The practical value is the creation of an ergonomic ensuring system of development, exploitation and modernization of difficult men-machine systems and metallurgical production management processes.

Analysis of interconnections between technical systems on hierarchically connected technological levels of steel sheet production by hot rolling

2020 ◽  
Vol 76 (8) ◽  
pp. 847-855
Author(s):  
E. N. Shiryaeva ◽  
M. A. Polyakov ◽  
D. V. Terent'ev
Keyword(s):  
Hot Rolling ◽  
Systems Analysis ◽  
Rolling Mill ◽  
Steel Sheet ◽  
Technological System ◽  
Necessary Condition ◽  
Rolled Sheet ◽  
Technological Systems ◽  
Hot Rolling Mill ◽  
Technical Systems

Complexity of modern metallurgical plants, presence of great number of horizontal and vertical interactions between their various structural subdivisions makes it necessary to apply a systems analysis to elaborate effective measures for stable development of a plant operation. Among such measures, digitalization of a plant is widespread at present. To implement the digitalization it is necessary to have clear vision about links at all the levels of the technological system of a plant. A terminology quoted, accepted in the existing regulatory documents for defining of conceptions, comprising the technological system. It was shown, that the following four hierarchical levels of technological systems are distinguished: technological systems of operations, technological systems of processes, technological systems of production subdivisions and technological systems of plants. A hierarchical scheme of technological systems of hot-rolled sheet production at an integrated steel plant presented. Existing horizontal and vertical links between the basic plant’s shops shown. Peculiarities of flows of material, energy and information at the operation “rolling” of the technological system “hot rolling of a steel sheet” considered. As a technical system of the technological process of the hot rolling, the hot rolling mill was chosen. A structural diagram of the hot rolling mill was elaborated, the mill being consisted of reheating furnaces, roughing and finishing stand groups, with an intermediate roll-table between them, and down-coilers section. Since the rolling stands are the basic structural elements of the hot rolling mill, structural diagrams of a roughing and a finishing stands were elaborated. Results of the systems analysis of the technological and technical systems, hierarchically linked in the process of steel sheet hot rolling, can be applied for perfection of organization structure of the whole plant, as well as for elaboration mathematical models of a system separate elements functioning, which is a necessary condition for a plant digitalization.

Reducing dynamic loads in the mechatronic system of a rolling mill

2020 ◽  
pp. 45-48
Author(s):  
S.I. Malafeev ◽  
A.A. Malafeeva ◽  
V.I. Konyashin
Keyword(s):  
Direct Current ◽  
Electric Drive ◽  
Rolling Mill ◽  
Correction Method ◽  
System Model ◽  
Dynamic Loads ◽  
Dynamic Processes ◽  
Mechatronic System

A correction method for regulating the mechatronic system of a «DUO-300» rolling mill with a direct current electric drive is considered. The results of the study of dynamic processes in the mechatronic system with the proposed correction are presented. Keywords rolling mill, mechatronic system, model, electric drive, engine, regulator, correction. [email protected]

Reviews in Dynamic Characteristics of Rolling Interface and Vibration Test/Suppression Methods of Rolling Mill

2020 ◽  
Vol 14 ◽  
Author(s):  
Xiao-bin Fan ◽  
Hao Li ◽  
Yu Jiang ◽  
Bing-xu Fan ◽  
Liang-jing Li
Keyword(s):  
Dynamic Characteristics ◽  
Rolling Mill ◽  
Frequency Conversion ◽  
Vibration Suppression ◽  
Rolling Force ◽  
Rolling Process ◽  
Friction Model ◽  
Time Frequency ◽  
Roll Gap ◽  
Rolling Mill Vibration

Background: Rolling mill vibration mechanism is very complex, and people haven't found a satisfactory vibration control method. Rolling interface is one of the vibration sources of the rolling mill system, and its friction and lubrication state has a great impact on the vibration of the rolling mill system. It is necessary to establish an accurate friction model for unsteady lubrication process of roll gap and a nonlinear vibration dynamic model for rolling process. In addition, it is necessary to obtain more direct and real rolling mill vibration characteristics from the measured vibration signals, and then study the vibration suppression method and design the vibration suppression device. Methods: This paper summarizes the friction lubrication characteristics of rolling interface and its influence on rolling mill vibration, as well as the dynamic friction model of rolling interface, the tribological model of unsteady lubrication process of roll gap, the non-linear vibration dynamic model of rolling process, the random and non-stationary dynamic behavior of rolling mill vibration, etc. At the same time, the research status of rolling mill vibration testing technology and vibration suppression methods were summarized. Time-frequency analysis of non-stationary vibration signals was reviewed, such as wavelet transform, Wigner-Ville distribution, empirical mode decomposition, blind source signal extraction, rolling vibration suppression equipment development. Results: The lubrication interface of the roller gap under vibration state presents unsteady dynamic characteristics. The signals generated by the vibration must be analyzed in time and frequency simultaneously. In the aspect of vibration suppression of rolling mill, the calculation of inherent characteristics should be carried out in the design of rolling mill to avoid dynamic defects such as resonance. When designing or upgrading the mill structure, it is necessary to optimize the structure of the work roll bending and roll shifting system, such as designing and developing the automatic adjustment mechanism of the gap between the roller bearing seat and the mill stand, adding floating support device to the drum shaped toothed joint shaft, etc. In terms of rolling technology, rolling vibration can be restrained by improving roll lubrication, reasonably distributing rolling force of each rolling mill, reducing rolling force of vibration prone rolling mill, increasing entrance temperature, reducing rolling inlet tension, reducing strip outlet temperature and reasonably arranging roll diameter. The coupling vibration can also be suppressed by optimizing the hydraulic servo system and the frequency conversion control of the motor. Conclusion: Under the vibration state, the lubrication interface of roll gap presents unsteady dynamic characteristics. The signal generated by vibration must be analyzed by time-frequency distribution. In the aspect of vibration suppression of rolling mill, the calculation of inherent characteristics should be carried out in the design of rolling mill to avoid dynamic defects such as resonance. It is necessary to optimize the structure of work roll bending and roll shifting system when designing or reforming the mill structure. In rolling process, rolling vibration can be restrained by improving roll lubrication, reasonably distributing rolling force of each rolling mill, increasing billet temperature, reasonably arranging roll diameter and reducing rolling inlet tension. Through the optimization of the hydraulic servo system and the frequency conversion control of the motor, the coupling vibration can be suppressed. The paper has important reference significance for vibration suppression of continuous rolling mill and efficient production of high quality strip products.

The Unintended Consequences of Tax Policy: How Mississippi's Ad Valorem Tax Structure Led to Environmental Devastation

2020 ◽  
Vol 47 (1) ◽  
pp. 75-85
Author(s):  
William H. Black
Keyword(s):  
20Th Century ◽  
Unintended Consequences ◽  
Tax Structure ◽  
Ad Valorem Tax ◽  
Timber Industry ◽  
Mill Operator ◽  
Clear Cutting ◽  
Environmentally Sensitive ◽  
Land Holdings ◽  
Ad Valorem

ABSTRACT This is a story in two parts. The first describes the timber industry and the ad valorem tax structure in Mississippi during the first several decades of the 20th century. The second introduces Ran Batson, an entrepreneur and lumber mill operator, whose history illustrates the adverse consequences of the Mississippi ad valorem tax as it inspired extensive clear-cutting of forests and resulting devastation. Fortunately, the Mississippi tax structure has subsequently changed to a more favorable approach, and in the last several years of his life, Ran Batson learned the benefits possible from managing his land holdings in a more environmentally sensitive manner.

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