Design And Experiment Research On Two-Component Dynamic Hybrid Piezo-Driven Injection Valve

With the advancement of current electronic manufacturing technology,electronic products are developing in the direction of miniaturization,environmental protection,integration,intelligence,energy saving,etc.,and also promote the development and renewal of electronic packaging technology and electronic packaging forms.As the key technology,dispensing technology will directly affect the quality of electronic products.At present,dispensing technology can be divided into two categories according to the different dispensing forms: one is contact dispensing and the other is non-contact dispensing.Compared with contact dispensing,non-contact dispensing has the advantages of high operating frequency,wide application range and good dispensing consistency,so it has broad market application prospects.In dispensing technology,the choice of colloid is also an important part.Compared with single-component glue,the two-component glue has high curing strength,high hardness and good corrosion resistance,and is widely used in the electronics manufacturing industry.The mixing method of two-component glue can be divided into static mixing and dynamic mixing.Based on piezoelectric theory and fluid injection theory,this paper proposes a two-component dynamic hybrid injection valve.The specific research contents of this paper are as follows:First,the piezoelectric effect and piezoelectric performance parameters are introduced.Then the structure of the piezoelectric stack is analyzed,and the influencing factors of the piezoelectric stack performance are obtained,which provides a theoretical basis for the subsequent research.Secondly,the mixing mechanism of the fluid and the evaluation criteria of the two-component glue mixing effect were studied.Then the paper establishes static hybrid model and dynamic hybrid model,and then uses Fluent software to simulate and analyze the mixed effect.By comparing the simulation results,this paper chooses the dynamic mixing method to mix the two-component glue.Then the effects of parameters such as the rotational speed of the rotor,the viscosity of the glue and the mixing ratio on the dynamic mixing effect were studied.Thirdly,the paper analyzes and designs the two-component dynamic hybrid piezoelectric injection valve:Design the structure of the rubber part and calculate the thrust generated;Design a hybrid part structure and select DC motors,bearings and couplings;The structure of the injection part is designed,the fluid injection theory is analyzed,and the strength is checked.Finally,this paper builds an experimental platform for a two-component dynamic hybrid piezoelectric injection valve.This paper tests the viscosity change trend of the two-component glue used in the experiment.Secondly,this paper tests the working stability of the injection valve,and concludes that the maximum glue amount of the injection point of the injection valve is 4.4mg,the minimum glue amount is 4.26 mg,and the average glue amount is 4.34 mg.Subsequently,this paper tests the effects of motor speed,striker radius,nozzle diameter,glue supply pressure and drive voltage on the amount of glue through experiments.