Fatigue Damage Of Sand Mold 3D Inkjet Printing Head Driver Behavioral Research

The driver of a piezoelectric inkjet printing head is an electronic device that controls the movement and inkjet of the printing head.The quality and performance of the driver directly affect the performance and printing quality of the printer.Driver fatigue damage can cause the print head to be unable to move,resulting in a decrease in print quality,and in severe cases,it can even cause complete damage to the print head,making the entire printer unable to function properly.In order to make the inkjet printing process more stable and the print head lifespan longer,the paper mainly conducted the following research:This article takes the piezoelectric print head driver as the research object,and analyzes the fatigue damage forms of the piezoelectric ceramic PZT driver from the aspects of fatigue fracture,crack propagation,and bonding interface delamination.The impact of different damage forms on the life of the print head driver is obtained,providing an analysis basis for the optimization of the structure and process parameters of the piezoelectric driver.Based on the inverse piezoelectric effect equation of thin plate solid mechanics and electrodynamics crystal structure,it is analyzed and deduced,and the theoretical equation that conforms to the stress and displacement of piezoelectric actuator is obtained.A mathematical model of piezoelectric actuator vibration plate was constructed and the influence of structural dimensions such as the thickness and width of SiO2 plate,PZT piezoelectric ceramic film,and Parylene protective layer on its fatigue damage was analyzed through COMSOL finite element simulation.The structural dimensions were optimized,effectively improving the lifespan and inkjet performance of the piezoelectric actuator.Using ANSYS software to analyze the effects of factors such as driving signal waveform,coupling force field strength,electric field strength,and voltage amplitude on the fatigue damage of piezoelectric actuators.Then,with stress amplitude and fatigue damage as optimization objectives,orthogonal experiments are designed.A set of structural parameters with lower stress amplitude and fatigue damage are obtained using signal-to-noise ratio analysis,mean analysis,and fitting value validation analysis methods.Finally,a droplet inkjet experiment was conducted on the experimental group with excessive stress amplitude in the orthogonal experiment,verifying the correctness of the orthogonal experimental analysis.Based on the fatigue damage model,finite element simulations were conducted on two types of fatigue damage processes:crack propagation and delamination.The fatigue damage analysis method of piezoelectric actuators was used to study the effects of loading waveform,coupled force field strength,AC electric field strength,and loading voltage on the fatigue damage of piezoelectric ceramic PZT,and experimental verification was conducted.Research has found that under loading parameters with high stability and strong anti-interference ability,the service life of piezoelectric actuators can be effectively improved.