Method of Preparation for Restoration of Worn Nitrided Journals of Crankshafts

2021 ◽  
Vol 1031 ◽  
pp. 31-36
Author(s):  
Alexandr Kulakov ◽  
Elena Barylnikova ◽  
Irina Talipova ◽  
Ilgiz Galiev ◽  
Sergey Voinash
Keyword(s):  
Electrical Discharge ◽  
Electrical Discharge Machining ◽  
Combustion Engine ◽  
Nitrided Layer ◽  
Liquid Dielectric ◽  
Temperature Plasma ◽  
Specialized Equipment ◽  
Use Studies ◽  
Full Utilization ◽  
Electric Discharge Pulse

The internal combustion engine is the most expensive component of a car, which determines the reliability and efficiency of its use. Studies show that one of the most common reasons for the failure of KAMAZ diesel engines during operation is the underutilization of the crankshaft resource due to wear of parts and couplings that limit its resource. An increase in the resource of crankshafts can be achieved by improving the technological processes of restoration and repair. Full utilization of the resource of KAMAZ nitrided crankshafts is possible by surfacing worn journals only after removing a nitrided layer up to 0.4 mm thick from the journals surface using specialized equipment for electrical discharge machining. Electrical discharge machining is based on the removal of material particles from the surface by an electric discharge pulse between electrodes immersed in a liquid dielectric, in the channel of which a high-temperature plasma is formed.

scholarly journals Comparative Study of Flank Cams Manufactured by WEDM and Milling Processes

Metals ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 1159
Author(s):  
Irene Buj-Corral ◽  
Enrique Zayas-Figueras ◽  
Àngels Montaña-Faiget
Keyword(s):  
Electrical Discharge ◽  
Electrical Discharge Machining ◽  
Combustion Engine ◽  
Computer Assisted ◽  
Geometrical Parameters ◽  
Wire Electrical Discharge Machining ◽  
Shape Error ◽  
Fused Filament Fabrication ◽  
Cam Follower ◽  
Contour Surface

Cam-follower mechanisms are usually employed in different machines, like combustion engines, sewing machines, machine tools, etc. In the present paper, the option to manufacture cams utilizing wire electrical discharge machining (WEDM) has been considered. For this, surface roughness and shape error of cam profiles manufactured by the processes of milling and wire electrical discharge machining (WEDM) are presented. The methodology used covers different stages: design, prototyping, manufacturing, and measurement of the cams. As a reference, a cam-follower mechanism from a motorcycle internal combustion engine has been used. A reverse engineering process has been performed to determine the geometrical parameters of the mechanism, which are used for the synthesis of the profile of the cam and its subsequent design. The manufacturing process of the cams has been assisted by CAD-CAM (Computer Assisted Drawing-Computer Assisted Manufacturing) software. Using fused filament fabrication (FFF), a physical prototype of the cam has been manufactured, in order to validate the goodness of the design. Finally, the roughness and shape parameters have been measured on the contour surface of the cams. The arithmetical mean roughness Ra value of the milled cam was 0.269 μm, below the requirement of 0.4 μm, and shape error was 18 μm, below 50 μm. Shape error of the WEDM cam of 48 μm meets the requirements for cams. However, the Ra value of 1.212 μm, exceeded the limit. For this reason, a finish operation is recommended in this case. Some advantages of WEDM cams over milled cams are that different conductive materials can be employed, more complex shapes can be obtained, and that, in rough operations, the amount of material to be removed in subsequent operations is considerably reduced.

scholarly journals Исследование процессов электроэрозионной обработки

2019 ◽  
Vol 89 (6) ◽  
pp. 887
Author(s):  
М.Ю. Сарилов ◽  
В.В. Мыльников
Keyword(s):  
Heat Transfer ◽  
Aluminum Alloys ◽  
Confidence Level ◽  
Electrical Discharge ◽  
Electrical Discharge Machining ◽  
Plasma Channel ◽  
Reference Value ◽  
Dielectric Medium ◽  
Liquid Dielectric ◽  
Fisher Criterion

AbstractBreakdown in liquid dielectric medium, plasma channel, and heat transfer in the course of electrical discharge machining are studied. Specific features and most important parameters of electrical discharge machining of titanium and aluminum alloys are determined. Theoretical, experimental, and simulated results indicate that the adequacy hypothesis can be accepted at a confidence level of 95%, since the Fisher criterion is no greater than the reference value.

Tribocorrosion Properties of Titanium Alloy Modified By Electrical Discharge Machining

2017 ◽  
Author(s):  
Bruna Michelle de Freitas ◽  
Carlos augusto Henning Laurindo ◽  
Paulo Soares ◽  
Leticia Bemben
Keyword(s):  
Titanium Alloy ◽  
Electrical Discharge ◽  
Electrical Discharge Machining

Optimization of the Electrical Discharge Machining of Complex Components

2020 ◽  
Vol 40 (10) ◽  
pp. 870-872
Author(s):  
T. R. Ablyaz ◽  
E. S. Shlykov ◽  
K. R. Muratov
Keyword(s):  
Electrical Discharge ◽  
Electrical Discharge Machining ◽  
Complex Components

Recent Patents on Micro-EDM Milling

2020 ◽  
Vol 13 (3) ◽  
pp. 219-229
Author(s):  
Baocheng Xie ◽  
Jianguo Liu ◽  
Yongqiu Chen
Keyword(s):  
Electrical Discharge ◽  
Electrical Discharge Machining ◽  
Three Dimensional ◽  
Processing Method ◽  
Electrode Wear ◽  
Micro Edm ◽  
Processing Efficiency ◽  
Processing Methods ◽  
Machining Quality ◽  
Micro Electrical Discharge Machining

Background: Micro-Electrical Discharge Machining (EDM) milling is widely used in the processing of complex cavities and micro-three-dimensional structures, which is a more effective processing method for micro-precision parts. Thus, more attention has been paid on the micro-EDM milling. Objective : To meet the increasing requirement of machining quality and machining efficiency of micro- EDM milling, the processing devices and processing methods of micro-EDM milling are being improved continuously. Methods: This paper reviews various current representative patents related to the processing devices and processing methods of micro-EDM milling. Results: Through summarizing a large number of patents about processing devices and processing methods of micro-EDM milling, the main problems of current development, such as the strategy of electrode wear compensation and the development trends of processing devices and processing methods of micro-EDM milling are discussed. Conclusion: The optimization of processing devices and processing methods of micro-EDM milling are conducive to solving the problems of processing efficiency and quality. More relevant patents will be invented in the future.

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