scholarly journals Resurfacing the exhaust valve by plasma spraying versus electric arc and gas flame methods

2021 ◽  
Vol 80 (5) ◽  
pp. 260-268
Author(s):  
D. I. Balakhonov ◽  
I. A. Makarov ◽  
M. V. Yarantsev
Keyword(s):  
Plasma Spraying ◽  
Base Metal ◽  
Combustion Engine ◽  
Electric Arc ◽  
Exhaust Valve ◽  
Rolling Stock ◽  
Reduction Methods ◽  
Flame Plasma ◽  
Gas Flame ◽  
A Charge

In modern conditions of economic instability in various sectors of industry for the national economic complex, it is important to improve the technology for repairing parts of power units, while the development of modern technological methods for restoring the contact surfaces of parts should be carried out in the conditions of enterprises and be accessible. The article compares the most common methods of surface parts restoration, such as flame, plasma spraying and electric arc surfacing. Studied experience of various specialists working in this direction made it possible to implement these reduction methods using a charge based on a mineral tungsten-containing concentrate, boron and carbon. The process of alloying the resulting coatings was investigated, where tungsten is in the form of tungsten trioxide (WO3) and calcium tungstate (CaWO4). A comparative analysis of the methods for restoring the surface of the exhaust valve cone of the D49 diesel engine has been carried out. The article presents results of microand macroanalysis of the structures of the obtained coatings and the base metal of the restored part, the results of the analysis of the chemical composition, the evaluation of the microhardness and adhesive strength of the adhesion of the obtained coatings to the surface of the base metal. Authors substantiated the prospect of applying the methods of gas-thermal restoration of the surface of parts in relation to the method of electric arc surfacing. Subsequent studies will focus on the installation of remanufactured parts in the internal combustion engine of the locomotive, their operation in real conditions, and the assessment of reliability and durability. Research in this direction will improve the quality indicators of the restored surfaces of power unit parts of rolling stock.

Effect of electric arc, gas oxygen torch and induction melting techniques on the marginal accuracy of cast base-metal and noble metal-ceramic crowns

2013 ◽  
Vol 41 (9) ◽  
pp. 826-831 ◽  
Author(s):  
Pablo Gómez-Cogolludo ◽  
Raquel Castillo-Oyagüe ◽  
Christopher D. Lynch ◽  
María-Jesús Suárez-García
Keyword(s):  
Base Metal ◽  
Noble Metal ◽  
Electric Arc ◽  
Induction Melting ◽  
Metal Ceramic ◽  
Ceramic Crowns

Thermal Analysis and Computer Aided Exhaust Valve Design Automation Using CREO and Microsoft Excel Spreadsheet

2021 ◽  
Vol 8 (1) ◽  
Author(s):  
Siraj Chabru ◽  
P. S. Kulkarni
Keyword(s):  
Thermal Analysis ◽  
Internal Combustion Engine ◽  
3D Modeling ◽  
Internal Combustion Engines ◽  
Combustion Engine ◽  
Internal Combustion ◽  
Exhaust Valve ◽  
Valve Design ◽  
Microsoft Excel ◽  
Excel Spreadsheet

3D modeling has widely been used because of their ease in visualization, understanding and generation of manufacturing drawing sheets compared to 2D drafting. 3D Modeling is the timeconsuming process and many draftsmen does not have the skill to draw a 3D object inside a CAD packages. Internal combustion engine consists of two type of valves inlet valve and exhaust valve. The pair of inlet and exhaust valve is called as poppet valves. Exhaust valve is the mechanical object reputedly required nearly in all internal combustion engines. In this paper we are automate the exhaust valve design by creating graphical user tool using visual basic programming language inside the Microsoft excel spreadsheet. This excel spreadsheet is later integrated to CREO database for automatic 3D valve Modeling. Exhaust valve is the nose of the internal combustion engine to eject the exhaust gases out form the engine at a time of exhaust stroke. It is continuously come under the high temperature and pressure. Steady state thermal analysis has been carried out using FEA. To demonstrate our study, we are considered to design and analysis the exhaust valve for Honda CB Twister 110cc having chamfer angle of 45 degrees. For the 3D modeling we use CREO and ANSYS 18.0 is used for FEA analysis.

Modern technologies for preheating scrap before charging it into electric arc steelmaking furnace

2021 ◽  
Vol 77 (7) ◽  
pp. 782-790
Author(s):  
A. B. Biryukov ◽  
S. M. Saf’yants ◽  
P. A. Gnitiev ◽  
V. A. Shatovich
Keyword(s):  
Negative Impact ◽  
Electric Energy ◽  
Electric Arc ◽  
Hot Water ◽  
Steelmaking Furnace ◽  
Arc Furnaces ◽  
Scrap Heating ◽  
Technical Features ◽  
A Charge ◽  
Technical Solutions

There are a number of technical solutions to utilize the waste gases of electric arc furnaces (EAF) for scrap preheating thus returning back the heat into the technological process. The waste gases can be utilized also for steam or hot water production. The preliminary scrap heating before charging it into EAF is more perspective. Technical features of various types scrap heaters considered, including conveyer and shaft scrap heating technologies with continuous (Contiarc, Consteel, Comelt, BBC-Brusa) and periodic charging (Fuchs Systemtechnik, COSS, backet). It was shown that application of scrap heaters for EAF ensures saving of electric energy, increase of metal yield, decrease of dust and gases level in the shop, decrease of negative impact on environment. The disadvantages include frequent and costly repairs of the facilities, impossibility to control some factors having effect on the process of scrap heating. It was shown that when designing new EAFs with a charge exceeding 100 t, horizontal facilities are more preferrable, while for EAFs of small volumes shaft heaters suit better. At EAF modernizing it is recommended to use shaft heaters and back­et-thermos, since it is easier to construct a vertical furnace than a horizontal one with minimal length of 100 m. It was noted that hor­izontal heaters operate better in terms of technology, since ensure continuous charging by scrap, but at that occupy a considerable space in the shop. When comparing vertical heaters and backet by all the characteristics including heat-engineering and designingones, vertical shaft heaters prevail.

SIMULATION OF INTAKE AND EXHAUST VALVE TIMING ON INTERNAL COMBUSTION ENGINE

2017 ◽  
Vol 79 (7-4) ◽  
Author(s):  
Afiq Aiman Dahlan ◽  
Mohamad Shahrafi ◽  
Mohd Farid Muhamad Said
Keyword(s):  
Internal Combustion Engine ◽  
Power Output ◽  
Combustion Engine ◽  
Internal Combustion ◽  
Exhaust Valve ◽  
Miller Cycle ◽  
Average Percentage ◽  
Percentage Difference ◽  
Average Percentage Difference ◽  
Opening And Closing

Internal combustion engine in automotive industry is widely researched to increase its efficiency and power output. Valve system in modern internal combustion engine control the opening and closing timing of intake and exhaust stroke. Its duration affects the performance of the engine at both power output and fuel efficiency. Therefore, this study discusses about the Miller cycle concept that alter the duration of both intake and exhaust valve opening and closing characteristics. The study focusses mainly on finding the optimum timing characteristics on Proton Iriz gasoline engine. A 1-dimensional model has been built using a commercial software called GT-POWER for engine simulation purpose. The engine is then calibrated with the simulation model. The optimization was run in this software to find the best optimum timing of intake and exhaust valve for two categories which are targeting performance and fuel consumption. The results show positive trends in the BSFC results with the maximum percentage difference of 26.27% at 6,250 rpm. The average percentage difference in the BSFC results is 14.12%. For targeting performance, the overall results show an increasing trend in the brake torque curves with maximum percentage difference is 9.83%. The average percentage difference in brake torque is found to be 3.12%. Therefore, this paper concludes that Miller cycle implementation give minimal performance increment. The targeting performance and fuel consumption optimization can also be implement for changing mode of driving. However, the increase compression ratio would also give adverse effects on engine performance and endurance. The Miller cycle is also more suitable to be implement on force induction system. 

Reconditioning rolling stock components by electric arc spraying

1999 ◽  
Vol 13 (8) ◽  
pp. 665-668
Author(s):  
V P Kaz'Min ◽  
G K Sidorov ◽  
A N Khomutinnikov
Keyword(s):  
Electric Arc ◽  
Rolling Stock ◽  
Arc Spraying
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