The Three-dimensional Printing System Of Water Glass Sand By Microwave Curing

Sodium silicate sand is widely used in the foundry industry.Sodium silicate sand uses an inorganic binder,which is odorless,non-toxic,and environmentally friendly,which is in line with the development concept of national green production.Sodium silicate sand will not produce irritating or toxic gases in sand casting,and has good flow properties.Microwave-cured sodium silicate sand has the characteristics of high strength,fast curing speed,small amount of adhesive,low energy consumption,environmental protection,good collapse performance,and high recovery rate of used sand.The sand casting process using three-dimensional printing does not require molds and has stable quality,which can greatly improve production efficiency,save human resources,and improve the working environment,which is of great significance to the future development of the foundry industry.In this paper,firstly,through the experiment of microwave curing sodium silicate sand mold,the process parameters required by the system are obtained,the microwave process flow and the preliminary system architecture are determined;then combined with the principle of three-dimensional printing,the overall design of the sodium silicate sand 3D printing-microwave curing system is carried out and carried out Research on sand casting technology based on the principle of CNC machining.In terms of hardware,based on the STM32 main control chip,the circuit is designed for the main control module,microwave curing heating module,nozzle injection module,stepper motor motion control module,program debugging download,serial communication,etc.,and the composition of each circuit is studied.Principle,part of the interface is also reserved to realize the docking of the upper computer and the expansion of functions.A reasonable layout design of the circuit board is carried out to ensure the anti-interference ability of the circuit operation.In terms of software,the lower computer control program is designed according to the hardware circuit design,including the main system control program,the microwave heating control program based on PID(proportional integral derivative control)algorithm,the nozzle control program and the motor motion control program;developed in C# language The upper computer operation interface,the serial communication between the upper computer and the lower computer,realizes the printing status and data transmission;the MATLAB slicing algorithm is used to realize the efficient processing of the STL model.Finally,through the simulation experiment of CFD simulation nozzle spraying adhesive,a reasonable nozzle structure is determined,which is beneficial to further improve the quality and accuracy of the formed sand mold.