Development Of 3D Printer Based On DLP Technology For Ceramic Bone Support

Digital optical processing printing technology(DLP)is a rapid prototyping technology,which has the advantages of fast prototyping speed and high printing accuracy.In view of the shortcomings of low porosity of artificial bone implants used for bone injury repair in clinic,the size of the holes can not be randomly set,the penetration rate between holes is low,and there is no personalization,which leads to poor medical performance of the implants and poor rehabilitation effect of patients.This paper designs a 3D printer for printing bone implants based on DLP technology.The whole paper includes the following contents.:1)The overall design of DLP ceramic bone scaffold 3D printer is completed.The overall structure of the printer is designed by using the printing mode of DLP,the problems of the overall layout of the printer,the design of the work flow and the recovery of the printer slurry leak are solved in the design process.2)The properties of mixed size of hydroxyapatite and photosensitive resin is studied.Using the mixture of the bioactive hydroxyapatite and photosensitive resin as the printing material,the liquid can be analyzed and the expansion plastic fluid in non-newtonian fluid is determined.3)The influence of blade shape and working speed of scraper on printing accuracy is studied.The fluid mechanics software Fluent was used to analyze the process of scraper slurry scraping,so as to understand the influence of blade with different shapes on slurry flow.The optimal one was selected from the four existing scraper blades to complete the overall printer design.4)The function of DLP 3D ceramic bone scaffold printer is realized.The programmable controller ST300-D is used to control the stepping motor and servo motor of the printer.The printer is debugged and printed.Statistical analysis shows that the scraper works best at the speed of 0.038m/s.At the same time,the accuracy of the printer's layered thickness can reach(75,80]?m,and the flexible grid-shaped envelope bone bracket is successfully printed.