Key Technology Research And System Development Of Cavity Seal Detection For Complex Parts

Complex cavity parts are widely used in internal combustion engines,automobile,gas appliances and other production,its application domain is involved in all aspects of daily life,and its sealing performance directly determines the efficiency and working life of production.The air tightness detection of complex cavity parts has important engineering application value and is an important means for the precision assurance of intelligent manufacturing system.This paper analyzes the existing air tightness detection method,and puts forward a differential pressure detection method for the air tightness of the parts in the complex cavity.Calculation models on the cavity leakage and equivalent content of the parts cavity are established,and the working flow of the detection method of differential pressure leak is determined.The influence of different factors is analyzed on the pressure,temperature,differential pressure and temperature difference,and the rules of parameter optimization are summarized through modeling and simulation of the charging process,the differential detection process.On the basis of the differential detection method research,the overall scheme of the differential pressure air tightness testing instrument is designed.It has set up the instrument mechanical noumenon,pneumatic and electric control system,the embedded chip STM32F107 is used for detecting system hardware and software development.The selection of high-precision sensor is completed,and the data acquisition and processing,system control,real-time curve display,TCP communication and data storage are realized.The air tightness detection experiment of complex cavity parts is carried out,and the experimental results verify the effectiveness of the differential pressure leak detection method.