scholarly journals Automation experimental studies of grinding process in jaw crusher using DEM simulation

2018 ◽  
Vol 1118 ◽  
pp. 012007 ◽  
Author(s):  
I Beloglazov
Keyword(s):  
Experimental Studies ◽  
Grinding Process ◽  
Dem Simulation ◽  
Jaw Crusher

scholarly journals RESEARCH OF PHYSICAL AND MECHANICAL PROPERTIES OF WOOD-FIBER MATERIALS

2020 ◽  
pp. 451-457
Author(s):  
Aleksandr Yur'yevich Vititnev ◽  
Yuriy Davydovich Alashkevich ◽  
Natal'ya Geral'dovna Chistova ◽  
Roman Aleksandrovich Marchenko ◽  
Venera Nurullovna Matygullina
Keyword(s):  
Mechanical Properties ◽  
Wood Fiber ◽  
Experimental Studies ◽  
Physical And Mechanical Properties ◽  
Production Method ◽  
Strength Properties ◽  
Grinding Process ◽  
Technological Parameters ◽  
Fiber Materials ◽  
Traditional Construction

This paper presents the results of experimental studies of the physical and mechanical properties of wood-fiber boards of the wet production method when regulating the design and technological parameters of the grinding process. This allowed us to determine the influence of the working clearance between the grinding discs and the concentration of fibre mass with the subject to of quality change wood fiber after defibrator using the developed construction of the disc fibrillation action on the physico-mechanical properties of boards. As a result of the experiment, regression models were obtained that adequately describe the studied grinding process and allow predicting the values of physical and mechanical properties of the finished product depending on the established  parameters process. A comparative analysis of the size and quality characteristics of the fiber semi-finished product and its fractional composition when using a developed construction the disc of refiner fibrillation action and a traditional design used in industry is carried out. The preferential efficiency of the grinding process under the fibrillating effect the disc of refiner in comparison with the traditional construction disc of refiner is established. As a result, there is a significant improvement in the quality indicators of the fiber semi-finished product and its composition due to the formation and predominance in the total mass of long and thin, respectively, flexible fibrillated fibers with high tile-forming properties, which allows to increase the strength properties of the product (by 20–25%), without using binding resins.

Modeling of Micro-Positioning System Using Direct Mapping and Polynomial Fit for Precision Grinding Process Control

2007 ◽  
Vol 329 ◽  
pp. 791-796
Author(s):  
S. Tse ◽  
Y. Gao
Keyword(s):  
Process Control ◽  
Experimental Studies ◽  
Piezoelectric Constant ◽  
Grinding Process ◽  
Modeling Error ◽  
Precision Grinding ◽  
Positioning Systems ◽  
Direct Mapping ◽  
Polynomial Fit ◽  
Command Signals

For micro-positioning systems using piezoelectric actuators for precision grinding process control, sinusoidal command signals will be used and will give additional problems in comparison with the commonly used step signals due to the hysteresis effects, which require a good modeling approach. In order to avoid the discontinuity problem in obtaining the values of the piezoelectric constant, a new approach of direct mapping with polynomial fit is proposed. Theoretical and experimental studies are conducted and comparative studies are made. Compared with the single polynomial approach, the proposed method of direct mapping with polynomial fit is able to reduce the modeling error to 12.5%, which is 6.5% lower, and the problems in obtaining the values of the piezoelectric constant are avoided. The proposed approach is shown advantageous. Further studies are necessary to significantly reduce the modeling error.

Jaw Crusher Based on Discrete Element Method

2013 ◽  
Vol 312 ◽  
pp. 101-105
Author(s):  
Fu Sheng Mu ◽  
Hui Li ◽  
Xing Xue Li ◽  
Hong Zhi Xiong
Keyword(s):  
Energy Consumption ◽  
Discrete Element Method ◽  
Discrete Element ◽  
Working Process ◽  
Element Analysis ◽  
Dem Simulation ◽  
Force Condition ◽  
Jaw Crusher ◽  
Set Up ◽  
Element Method

In order to analyze the force condition and crushing power of crusher teeth plate, the discrete element method models of jaw crusher and double-cavity jaw crusher are set up respectively using EDEM, a kind of software for discrete element analysis. Meanwhile, the working process, the loading force on the teeth plate and crushing power are simulated. The results show that: the rationality of the DEM simulation is declared, and the crushing process of the particles is also shown intuitively. The loading force condition and the crushing power of the moving jaw teeth plate serve as basis for its abrasion and energy consumption respectively.

scholarly journals DEM Simulation of Autogenous Grinding Process in a Tumbling Mill

2011 ◽  
Vol 48 (12) ◽  
pp. 829-833 ◽  
Author(s):  
Shingo Ishihara ◽  
Rikio Soda ◽  
Junya Kano ◽  
Fumio Saito ◽  
Keiji Yamane
Keyword(s):  
Grinding Process ◽  
Dem Simulation ◽  
Tumbling Mill

scholarly journals STUDY OF THE INFLUENCE OF TECHNOLOGICAL PARAMETERS ON THE GRANULOMETRIC CHARACTERISTICS OF SUBMICRON ALUMINUM OXIDE IN α-FORM

2021 ◽  
Vol 6 (12) ◽  
pp. 84-97
Author(s):  
M. Troubitsin ◽  
N. Volovicheva ◽  
L. Furda ◽  
N. Skrypnikov
Keyword(s):  
Fine Particles ◽  
Raw Materials ◽  
Experimental Studies ◽  
High Yield ◽  
Cylindrical Shape ◽  
Grinding Process ◽  
Activated Alumina ◽  
Technological Parameters ◽  
Granulometric Characteristics ◽  
Kinetics Of

Experimental studies of the influence of technological parameters of grinding alumina raw materials in a ball mill on the kinetics of the grinding process and the granulometric characteristics of activated alumina in the α-form have been carried out. It is found that the use of spherical grinding bodies leads to the formation of a specific four-modal granulometric composition with maxima: 0.5; 4.0; 50.0 and 400.0 microns, respectively. The disadvantage of using spherical grinding bodies is the uneven distribution of the introduced intensifier additive (PEG), which in turn causes adhesion of fine particles and the appearance of aggregates. This is especially pronounced at n = 100 rpm. When using grinding bodies of cylindrical shape, on the contrary, there is a tendency towards a bimodal nature of the distribution of particles with maxima in the regions of 0.4 and 4 μm, respectively, regardless of the rotation speed of the drum (n). The use of cylpebs does not provoke agglomeration of the fine particle fraction, which is observed in the case of spherical grinding bodies. When analyzing the kinetics of grinding alumina raw materials, two main stages of the process are identified. The first stage corresponds to the active fragmentation of large initial aggregates into constituent crystallites by the cleavage mechanism. The second stage corresponds to a change in the grinding mechanism from crushing to abrasion. It is found that carrying out the grinding process for 10 hours using cylindrical grinding bodies at n = 100 rpm and φ = 0.35 provides a high yield of the submicron fraction of the target product (1 μm) - up to 20 wt. %.

A method for determining the generalized energy grindability index of particulate solids

1970 ◽  
Author(s):  
Vladimir P. Zhukov ◽  
Dmitriy А. Osipov ◽  
Vadim E. Mizonov ◽  
Dariusz Urbaniak
Keyword(s):  
Computational Analysis ◽  
Bulk Material ◽  
Experimental Studies ◽  
Strength Properties ◽  
Grinding Process ◽  
Particle Sizes ◽  
Actual Problem ◽  
Particulate Solids ◽  
Wide Range ◽  
Low Efficiency

To calculate and evaluate the efficiency of the processes of fractionation of particulate solids, various industry methods have been developed that are widely and successfully used for the analysis of specific industrial technologies. Different indicators are used to measure the strength properties of particles of a bulk material in various industrial technologies. The disadvantage of the situation is the complexity, and often the impossibility of using these specific indices of strength of materials for calculating the grinding process in new equipment or a new range of particle sizes. Significant energy consumption for grinding at low efficiency of industrial mills causes the necessity of carrying out the studies aimed to increasing the efficiency of fractionation of particulate solids. In connection with this, the actual problem of scientific research to develop a generalized and universal energy indicator of grindability particulate solids and a method for its determination that can be used to describe the grinding process and to evaluate its efficiency in various industrial technologies for a wide range of materials arises.Calculation studies were carried out within the framework of the thermodynamic approach to model a grinding process. In order to carry out experimental studies, a special program for measuring and processing experimental data obtained at the laboratory impact mill was developed.In the course of computational and experimental studies, a technique has been proposed to determine the energy grindability index of particulate solids. The relation of this index with the energy necessary for breakdown of the intermolecular bonds in the material under study is established.The carried out researches allowed substantiating the method of determining the generalized energy grindability index of particulate solids. Computational analysis showed that the technique with acceptable accuracy for engineering calculations can be used in practice to assess the possibility of enrichment of heterogeneous components and to determine the optimal technological conditions for the separation of these components.

scholarly journals EXPERIMENTAL INVESTIGATION OF THE TEMPERATURE AND ACCURACY CHARACTERISTICS OF DOUBLE-SIDED FACE GRINDING MACHINE

2019 ◽  
pp. 112-120
Author(s):  
И. Никитина ◽  
I. Nikitina ◽  
А. Поляков ◽  
A. Polyakov
Keyword(s):  
Angular Position ◽  
Experimental Studies ◽  
Fine Tuning ◽  
Grinding Process ◽  
Industrial Batch ◽  
Close Proximity ◽  
Characteristic Points ◽  
Grinding Machine ◽  
Processing Errors ◽  
Face Grinding

The paper proposes a methodology for experimental studies of double-sided face grinding machines on the criterion of heat resistance, including: method of simulating a grinding process; measurement of temperature; measurement of changes in relative angular position of the circles; the measurement of processing errors. The proposed methods for experimental studies of the thermal behavior and errors in the machining of a double-sided face grinder allow for fine-tuning of the machine under production conditions. At the same time, preliminary tests of a double-sided face grinder show that when grinding an industrial batch of cylindrical rollers, excessive temperatures are distributed unevenly across the machine nodes both at idle and during grinding. The ends of the spindle heads and the stand have the greatest excess temperature when working at idle, and when grinding - on the surface of the machine, located in close proximity to the grinding zone. The nature of changes in excess temperatures of characteristic points and coolant when simulating the grinding process on the machine completely coincided with the experimental data obtained on a working machine.

scholarly journals ENERGY EFFICIENCY OF THE FIBER SEMI-FINISHED PRODUCT GRINDING PROCESS

2020 ◽  
Author(s):  
Aleksandr Vititnev ◽  
Yuri Alashkevich ◽  
Natalia Chistova
Keyword(s):  
Energy Efficiency ◽  
Power Consumption ◽  
Experimental Studies ◽  
Specific Power ◽  
Grinding Process ◽  
Specific Power Consumption

This paper presents the results of experimental studies of the process of grinding fiber semi-finished products, the specific power consumption for its implementation with different refining disks in the production of fiberboard.

Experimental study on grinding wheel radial wear in surface grinding of steel CrV12 using a zonal centrifugal coolant provision system

2016 ◽  
Vol 230 (12) ◽  
pp. 1452-1461 ◽  
Author(s):  
Jarosław Sieniawski ◽  
Krzysztof Nadolny
Keyword(s):  
Experimental Studies ◽  
Careful Consideration ◽  
Surface Grinding ◽  
Grinding Wheel ◽  
Grinding Process ◽  
Wheel Wear ◽  
Contact Conditions ◽  
Dry Grinding ◽  
Favorable Conditions ◽  
The Impact

The tribology of the grinding process can be considered in the context of a tribosystem, in which the main structural elements (grinding wheel, workpiece, grinding fluid, and environment) are interrelated and interdependent. One of the most important factors influencing the contact conditions of these listed elements of the grinding process tribosystem are the proper selection of grinding fluids and anti-adhesive substances, as well as careful consideration of how they are applied. This article describes a new zonal centrifugal coolant provision system as well as the results of experimental studies conducted into its use. The aim of these experiments was to determine the impact of the system of grinding fluids provision on grinding wheel radial wear in the surface grinding process of steel CrV12. Reference methods within the described studies consisted of dry grinding and grinding using the flood method, among others. The obtained results of the experiment revealed that the use of a zonal centrifugal coolant provision system enabled the acquisition of a similar radial wear rate of the grinding wheel at 90% reduction of grinding fluids flow rate, compared with flooding method. It was also demonstrated that in the most favorable conditions, it is even possible to significantly reduce the intensity of the radial wheel wear, compared with the conventional method.

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