Study On Carbon Cleaning Process Of Aluminum Alloy Piston Surface In Engine Remanufacturing

Since the twentieth century,China's car ownership has shown a spurt of growth.Some of the key components of the engine that are in the warranty period or are retired are often abandoned for the enterprise.Remanufacturing of key parts of the engine not only saves resources,realizes recycling of resources,but also protects Environment,reduce pollution,in line with the country's construction of a resource-saving and environment-friendly sustainable development path.Pistons are the core components for engine function conversion,and their remanufacturing is of great significance.Cleaning the piston surface carbon is a key step in achieving remanufacturing.Therefore,The carbon surface cleaning process of aluminum alloy engine piston surface are studied,and then finds the most effective cleaning process for cleaning aluminum alloy piston surface carbon.The following are the main research contents:Firstly,the composition,formation cause and formation process of carbon surface of aluminum piston were studied theoretically,and the mechanism of ultrasonic cleaning was expounded.Secondly,the existing methods for evaluating the cleanliness of metal surfaces were analyzed,the innovative design of MATLAB was used to establish the evaluation system for the cleanliness of the top surface of the piston.The image processing program was written by MATLAB to process the collected photos,and finally the remaining percentage of the piston top area carbon after cleaning was used to determine the cleaning level and the cleanliness of the piston surface.Again,Four mainstream cleaning carbon cleaning chemical cleaners on the market were selected to do the cleaning test to find the best cleaning agent for carbon removal.The parameters and content of the cleaning agent were optimized,and the effects of various factors on the cleaning effect of carbon deposition were determined by orthogonal experiment,and the optimal level of each factor was obtained.The final formulation of the water-based cleaning agent was determined by a single factor experiment to determine the optimum content of the maximum factor affecting the carbon cleaning efficiency.Finally,combined with chemical cleaning and ultrasonic cleaning technology,three different cleaning processes were designed,such as purifying soaking,first chemicalimmersion cleaning for 10 minutes,ultrasonic cleaning,chemical immersion for 10 minutes,and ultrasonic cleaning for 2 minutes.The best cleaning process was verified by a cleaning experiment.The research in this paper shows that the top surface cleanliness evaluation system established by MATLAB software can quantify the carbon content of the aluminum piston top area,and can accurately evaluate the cleanliness of the top surface of the piston after cleaning by the percentage of carbon deposition.The improved water-based cleaning agent has a good cleaning effect and is not harmful to the environment.the cleanness of the top surface of the piston after cleaning was in the 10 th grade.It was finally determined that the cycle cleaning method of ultrasonic cleaning for 2 minutes after the first chemical immersion for 10 minutes is the best cleaning process.After the cleaning was completed,the carbon residual ratio of the piston top area was 0.2%,which is in the 10 A cleaning level.The research shows that the aluminum alloy piston surface carbon cleaning process designed in this paper is feasible.