An Application Research On Scanning Strategies Based On EC1000 Laser Steering Systems For 3D Printing

Selective Laser Sintering(SLS)is a kind of 3D Printing technology for sintering powder,Parts made by SLS have characteristics of high strength and high precision.But there are some of problems in the process of SLS when processing materials that is sensitive to temperature,e.g.the temperature of some areas is higher than normal and some areas is lower than normal,which affects the strength and precision of parts.This article presents relative scanning strategies arming at nonuniformity of power density based on kinetic characteristics of the laser steering system and implements strategies,then I had experimental verifications.This article has an analysis to theories of main driven parts and explain the flow of controlling based on EC1000.This article has an analysis to the strategy of delay setting and the strategy of velocity controlled laser modulation.This article considers that it is the reason of acceleration segment and deceleration segment that make the nonuniformity of laser power density.If scanning a short segment,it is easy to make short segment overburn.If adjusting some relative parameters to make short segments have proper laser power density,long segments may have not enough laser power density.So I present that dividing all of fill segements into several parts based on the length of segments,and then configure different parameters to different parts of segments.At last,I implemented the strategy and had an experimental verification.Considering processing of high sensitivity materials,the aforesaid strategy may not solve the nonuniformity of laser power density, I had a practical research on the acceleration segment and the deceleration segment and found the length of two segments are almostly the same,so I propose extending the length of acceleration segment and deceleration segment until the two segments in a fill line exactly locate at the outside of outline,in addition to the extending method,I set appropriate laser delay parameters to make the scanning of extend segments without laser.This strategy makes the laser power density of line uniform.I designed relative strategies on fill and outline and then implemented my strategies and verified it.