| Blind hole parts generally exist in manufacturing industry fields. It is the general terms of parts that possess blind hole, micro hole or narrow aperture on structure. There is plenty of oil fouling and particles which are very difficult to remove are left on these structures during manufacturing process and seriously affect the performance of these parts. There are many shortcomings of traditional cleaning methods, such as low cleaning efficiency, uneven cleaning quality, low rate of oil fouling removing and poor environmental protection effect. All of these limit the final product function, reduced service life, increased failure rate etc. It restricts the long-term development of our country's manufacture field. In order to clean blind hole parts effectively, it is necessary to study specific cleaning methods to meet cleaning quality requirements, as well as the current environmental protection requirements from cleaning industry.Ultrasonic cleaning is a new kind of cleaning process which is increasingly used recently. For the structure characteristic of blind hole parts and using characteristic of hydrocarbon cleaning agent, the vacuum technology is introduced to achieve better cleansing effect. At present, ultrasonic vacuum cleaning process are more and more concerned by researchers of cleaning industry field, and it is ongoing in-depth research. This paper take the ball pen point which is one kind typical blind hole parts as research points, and study on ultrasonic vacuum cleaning technology. The main works of this paper are as follows:(1) The characteristic of blind hole parts and its pollutants are analyzed, the theory of ultrasonic vacuum cleaning and hydrocarbon solvents are studied. The ultrasonic vacuum cleaning experimental equipment is designed, and aluminum foil corrosion experimental method is used. Matlab image processing technology and microscope are used as analytical methods. By evaluating the aluminum foils corrosion results, the influenced factors of ultrasonic cavitations strength are studied, and cleaning process parameters and conditions are optimized. The better experimental parameters of power density are 0.4 W/cm~2, frequency is 40kHz with sweeping model are found. The influence of different vacuum degree on the degassing of blind hole on ball pen point and gas solubility in hydrocarbon solvents and its law are studied specially. The phenomenon of bubbles' separating out, adhering to parts and floating to surface are analyzed and described. The best degassing and cleaning effect is found at -0.08MPa vacuum degree. (2) By carrying out ball pen point ultrasonic vacuum cleaning experiment, validated the effectiveness of the cleaning process parameters. The problem of instability cleaning quality of blind hole parts are solved in the practical cleaning application. Average dirt removal rate is higher than 90%, Average dirt remaining is lower than 3mg.(3) According to the conclusions of the experiment, the ball pen point ultrasonic vacuum cleaning equipment is developed. The systems of equipment are design, for example, cleaning system, vacuum systems, and fire control systems, cooling systems etc. The drawings of pipeline system and mechanical system are designed. The valuable designing materials are provided to other relative equipments' research and design.According to the work of this paper, combined the actual cleaning requirements of blind-hole parts with research of ultrasonic vacuum cleaning process, applied the research conclusions to cleaning production. The practical value is obtained and the contributions are made to R & D of ultrasonic vacuum cleaning process.
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