摘要
3-P-2[SS]机构FDM-3D打印机结构复杂,由于零部件加工和装配造成的结构误差,依靠三角函数解算动平台位置运动参数难以保证定位精度。通过对机构模型的逆运动学分析,推导了运动副垂直滑动计算公式,提出了一种动平台垂直误差补偿方法,对动平台在构建平台上运行区域进行了分析仿真,利用反距离加权插值算法,基于初始基准层打印高度采样,在机构运动约束条件下推导出动平台垂直精度补偿公式,通过实验验证了参数优化后设备成型过程中的定位精度获得很大提高,打印各厚度实验件的成型尺寸误差控制在±0.03mm以内,有效提高了成型件成型精度。
The mechanism of FDM-3D with 3-P-2[SS]structure printer is complex.Due to the structural errors caused by parts processing and assembly,it is dificult to ensure the positioning accuracy by using trigonometricfunction to calculate the motion parameters of the moving platform.According to the inverse kinematics analysis of the mechanism model,the calculation formula for the vertical sliding of the kinematic pair is derived,and a vertical error compensation method for moving platform is proposed.The running area of the moving platform on the construction platform is analyzed and simulated.Using the inverse distance weighted interpolation algorithm,and based on the base layer height sampling,the vertical accuracy compensation formula of the moving platform was derived under the constraint of mechanism motion.Experiments verify that the positioning accuracy of the afier parameter optimized equipment is greatly improved during the molding process,and the molding size error of the printed test pieces of various thicknesses is controlled within+0.03mm,which effectively improves the molding accuracy of the moldings.
作者
吕宁
赵欣
罗忠洁
姜金刚
LV Ning;ZHAO Xin;LUO Zhong-jie;JIANG Jin-gang(School of Mechanical Engineering,Yangzhou Polytechnic College,Jiangsu Yangzhou 225009,China;School of Automation,Harbin University of Science and Technology,Heilongjiang Harbin 150080,China;Institute of Mechanical Power Engineering,Harbin University of Science and Technology,Heilongjiang Harbin 150080,China)
出处
《机械设计与制造》
北大核心
2023年第8期203-207,共5页
Machinery Design & Manufacture
基金
中国博士后基金(2018T110313)。
