DESIGN, MANUFACTURING AND TESTING OF LINEAR FLOW STEEL SHOT SEPARATOR (AMPD 2015 (original) (raw)
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2012
The paper has as a primary objective of mathematical modelling of the particles detachment from the alveoli of indented cylinder separators, highlighting the critical angle of detachment, position and initial velocity of the particle. The numerical simulation of the impurities detachment points and the particle trajectory after detachment from the alveoli, until collecting into the receiving gutter, has been performed using MathCad 12 software. The paper also has as a secondary objective of verifying the mathematical model by comparing the theoretical and experimental trajectory. In order to highlight the particle trajectory on experimental path, an indented cylinder separator stand, a high speed video camera and specialized software for advanced motion analysis have been used. The results have been obtained from experimental research which confirm the mathematical model.
The aim of this research is to study the effect of changing various parameters of the shot peening process on the productivity of the manufacturing of coiled springs. The manufacturing process of Coiled spring involves various processes including shot peening. This process strengthens the steel to resist metal fatigue and cracking during its lifetime of repeated flexing. Within this research a modification in the finishing operation of shot peening process is presented. The variation of the Peening time with the variations of projection angle and Pulley Diameters is observed. The results have been verified and presented. It has been found that with the adjustment of the proper projection angles and pulley diameters for the shot blasting process the manufacturing time can be reduced by 5 to 6 minutes.
The Effect of Technological Parameters on Intensity of Shot Peening Process of 51CrV4 Steel
Acta Mechanica et Automatica, 2016
In the paper the effect of selected technological parameters of shot peening on process intensity of 51CrV4 steel was presented. The experiments were conducted according to statistical 3-level completed plan PS/DC 32. Technological parameters were changed in the range: shot peening time t = 1-3 min and pressure p = 0.2-0.4 MPa. In the article the analysis of experiment reproducibility, impact parameters significance and adequacy of equation were done. As the result of investigations the adequate equation was obtained describing the effect of technological parameters. Significant influence on process intensity was found in case of pressure and interaction of both analyzed technological parameters. The biggest energy of stream shots was gained at the maximum pressure of 0.4 MPa and the shot peening time of 3 minutes. As the result of analysis according to design of experiment (DOE) the adequate equation describing the dependencies between technological parameters and process intensity...
Precision balls are used in critical aeronautical bearings, guidance system balls for space and military applications, precision valves, automotive bearings and other applications where higher precision is necessary. However, since the surface finishing process necessary for the balls to achieve the required surface quality and geometric accuracy is time consuming and expensive, it increases the manufacturing cost significantly and therefore confines their widespread application. Hence, the development of a more economical finishing method becomes a critical problem in the application of advanced Steel ball manufacturing. The major concern of the current study is to investigate the performance of the Flashing machine in the initial stage. In flashing of steel balls, the influence of the groove depth of plates on the Material Removal rate of balls is analyzed experimentally. Five flashing plates with different groove depth are used. A shallow round groove is equivalent to a V groove with a large angle. A deep round groove corresponds to a V groove with a small angle. From the experimental readings, regardless of the groove depth of the Gap plate, the one where the groove of the rotary plate is deep it is found that MRR is large. Best MRR is found at the combination of 0.1 D – 0.3 D. The experiment for Flashing was designed using a full factorial design with two levels for each input variable (2 k factorial design). Since there are three factors, each at two levels, the design is 2 3 factorial design which requires 8 runs to complete all the possible combinations. Factors taken for the experiments are Pressure between two plates, No. of Grooves in plates & RPM of Ring Plate. From the main effect plots, to achieve higher Material removal rate pressure should be at its higher level, RPM should be also at higher level, No. of grooves should be at its lower level. Also from the experiments the percentage contribution of various parameters on Material removal rate are Pressure having 58.16% , RPM having 16.86%, No. Of grooves having 23.90%. Analyzing the various process parameters, their influence in the operation & experiments are conducted at NHB Bearings Company.
Robotic Machine for High-Quality Shotcreting Process
This paper summarizes the development of the technologies used to produce high quality sprayed concrete layers by robotizing a commercial shotcreting machine and automating the process used in the tunnelling construction industry. The proposed method provides the control system with the information of the properties of the pumping process, controlling the quality of the concrete layer by adjusting in real-time the trajectory of the shotcreting machine. Given the unstructured nature of the tunnelling construction method there is an inherent difficulty in the automation of the shotcreting process. A complete description of the implemented control architecture of the shotcreting machine, the automated shotcreting process, the real-time quality layer prediction and the analysis of the tests made in real sites are shown in this paper.
Agriculture
The technological process of agricultural production is inextricably linked to the movement of a large number of goods, ranging from the supply of raw materials to their conversion and delivery of finished products. In the implementation of freight flows at the enterprises of agro-industrial complexes and the complex mechanization of raw material conversion processes, the main role is played by systems of transport and technological machines, which include screw conveyors with the ability to convert materials. For this purpose, the simultaneous performance of transportation and separation processes has been studied. The results of the investigation include the construction and study of the mathematical model of the system «a screw of the screw conveyor—grain mixture and separation process» involving further experimental research. The study of the effectiveness of separating agricultural materials with a multifunctional screw conveyor-separator showed that for effective sifting, the ...