Design And Practice Of Desktop Mask Projection Stereolithography Control System

Desktop Mask Projection Stereolithography control system is a cost-controlled,volume-constrained photocuring rapid prototyping technology that uses image projection technologies such as LCD or DLP to place near-ultraviolet light sources and form a mask to stack materials for model manufacturing.The characteristics of high-precision product customization,localized production and reduction of logistics costs are the keys to promoting the rapid prototyping technology in the consumer market.The design of the control system is carried out research and design from the perspective of system stability and real-time performance,applicable slicing schemes and equipment interaction under the premise of considering cost and volume constraints.Therefore,this thesis designs and implements a system scheme that uses LCD as a molding light source and takes embedded devices as the core.The content of this thesis is as follows:(1)From the perspective of stability and real-time,SKEAZ128 based on ARM Cortex-MO+core is used as the control core for software and hardware design.From the perspective of stability,the hardware designs interface circuits and isolation circuits to prevent electromagnetic interference generated by equipment operation.In terms of software,the real-time operating system MQXLite is used to plan the functional task design plan,and the design points of each task are given.(2)From the perspective of the applicable slicing scheme,for the phenomenon of nesting overlap in the process of arranging multiple models involved in the printing model slicing operation,the filling error of the nesting overlap caused by the scan line parity filling.This thesis proposes a slice filling algorithm based on the orientation of the face normal vector.The extracted slice contour is oriented according to the face normal vector and a non-zero-surround filling scheme is adopted to correctly slice the case where multiple models overlap.The feasibility of using the slicing algorithm in this thesis is verified by experimental tests.(3)From the perspective of interactivity,through the embedded human-machine interface as the carrier of interaction,the test interface and functional process interface are designed according to the component software engineering design ideas,which facilitates equipment testing,maintenance and function execution,and improves the operability of the equipment.Finally,based on the analysis of the molding effect obtained by the actual molding experiment,the control system designed in this paper can meet the application requirements of the desktop Mask Projection Stereolithography system.At the same time,the system designed in this subject has the characteristics of low cost and high precision,and has entered the stage of equipment testing and has certain market value.