| The press-fitting of the double nozzle flapper valve nozzle stays in manual press-fitting, in the process of the press-fitting, the press-fitting operation is cumbersome and can not eliminate the crawling phenomenon very well, so the press-fitting efficiency and quality are extremely low, which can’t meet the requirements of the batch assembly. For this reason, this paper analysed the manual press-fitting, and put forward the scheme of ultrasonic auxiliary press-fitting, then, carried out the theoretical and experimental research bein g connected to the ultrasonic vibration. On this basis, conduct the press-fitting experiment by changing the way of the strategy.Analysed the existing problems of the current manual machine in the process of press-fitting, including stiffness of the press-fitting system and the crawling problem of nozzle during press-fitting process, etc. Combined manual press-fitting equipment with the situation of application of ultrasonic vibration in engineering, proposed the application of ultrasonic auxiliary press-fitting, and developed a set of ultrasonic auxiliary press-fitting experiment system, including the mechanical structure of noumenon, ultrasonic vibration system, motor control circuit, the detection circuit of the grating ruler and inductive displacement sensor and press-fitting software for the experiment system.Done flow field simulation on the different distance between the nozzle and the baffle respectively by using fluid simulation software FLUENT, The result of the experiment is analyzed for the change trend and the experience formula is also given under different condition, on this basis, determined the necessary displacement of the press-fitting. In addition, Find out the relation between the pressure of the nozzle cavity and the band or offset by analysis of the flow field simulation; Simulation of the conventional and ultrasonic vibration press-fitting was carried out in ANSYS. In the emulational process of ultrasonic auxiliary press-fitting, exerted ultrasonic vibration load on the model by the function editor, so as to realize the simulation of ultrasonic auxiliary press-fitting. On this basis, the axial stress on the surface of the nozzle and the friction stress between the nozzle and the hole was analyzed;Finally, in view of the different effects between conventional press-fitting and ultrasonic auxiliary press-fitting and the difficulties on press-fitting, on the basis of experimental system, conducted experiments on conventional press-fitting and ultrasonic auxiliary press-fitting, determined the feasibility of ultrasonic auxiliary press-fitting and the effects of ultrasonic vibration on press-fitting process; In addition, due to the limitation of the feeding system, put forward the ideal completing the press-fitting by the prediction of the press-fitting process, verified it through the experiments, and got very good application effect. |
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