填充速度对制件拐角轮廓部位熔融沉积精度与打印效率的影响

Influence of Filling Speed on Forming Accuracy and Printing Efficiency of Parts at Corner Contour Locations in Fused Deposition Modelling

熔融沉积制件的拐角轮廓处存在重复沉积与漏沉积的结构缺陷,且受填充速度和拐角角度等参数的影响,难以同步兼顾成形精度与打印效率。文中首先运用实验与数学方法,研究了填充速度对拐角轮廓的成形精度与打印效率的影响规律,研究结果表明:成形精度与填充速度主要成反比关系,但在较高的填充速度下拐角轮廓处也可实现相对较高精度、较高效率的打印效果;填充速度越大对打印效率的影响越弱,打印耗时随填充速度的增加而逐步趋向一个恒定值;然后通过对成形精度和打印效率设定权重系数,构建了制件拐角轮廓打印的最优填充速度连续函数,并提出了其自适应控制的初步设计思路。

It is difficult to simultaneously balance the forming accuracy and printing efficiency when filling parts at corner contour locations in fused deposition modelling due to the structural defects such as repeated and missing deposition zones and the influence of parameters such as filling speed and corner angle.In this paper,firstly,the influence of filling speed on the forming accuracy and the printing efficiency of parts at corner contour locations was studied with experimental and mathematical methods.The research results show that the forming accuracy is negatively related to the filling speed,but meanwhile relatively high forming accuracy and high printing efficiency could also be realized under a higher filling speed at corner contour locations in fused deposition modelling.The higher the filling speed,the weaker the effect on the printing efficiency,and the printing time tends to a constant value when the filling speed increases.Then,by setting the weight coefficients for forming accuracy and printing efficiency,a continuous function of the optimal filling speed and the preliminary design idea of adaptive control were proposed.