Research on FDM dimensional accuracy modeling method based on contour compensation
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摘要: 针对熔融沉积制造（FDM）在热成型过程中由于材料收缩带来尺寸偏差的问题，基于初始设计模型进行轮廓补偿，以减小尺寸偏差，提升尺寸精度。采用正交试验设计系列正椭圆柱体、正三棱柱体和正四棱柱体模型，提出了两种轮廓补偿方式，分别采取方式一和方式二对试验件初始设计模型轮廓进行补偿。结果表明：针对本文研究案例，正椭圆柱体、正三棱柱体和正四棱柱体成型尺寸精度存在差异。两种方式均可提升尺寸精度，同一种方式对正椭圆柱体、正三棱柱体和正四棱柱体的尺寸精度提升程度不同，方式二有更优的补偿效果。Abstract: The problem of dimensional deviation caused by material shrinkage in the hot forming process of fused deposition manufacturing (FDM) should be solved. Thus, contour compensation method that based on the initial design model is carried out to reduce dimension deviation to improve dimension accuracy. A series of ellipsoidal cylinders, regular prisms are designed by orthogonal test. Two contour compensation methods are proposed, and the two methods are used to compensate the contour of the initial design model of the test pieces. The results show that there are differences in the forming dimensional accuracy of the elliptical cylinder, the triangular prism and the square prism for the examples in this article. Both of the two methods can improve dimensional accuracy. Dimensional accuracy of regular elliptical cylinder, regular triangular prism and square prism is promoted in different degrees by the same compensation method. The second has better compensation effect than the one.
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Key words:
- fused deposition modeling /
- contour compensation /
- dimensional accuracy
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表 1 实验件几何参数
序号 几何参数 $ {l_{AB}} $/mm $ {l_{CD}} $/mm $ {l_{ZC}} $/mm 1 14 8 8 2 14 10 10 3 14 12 12 4 16 8 10 5 16 10 12 6 16 12 8 7 18 8 12 8 18 10 8 9 18 12 10 
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表 3 轮廓补偿方式对尺寸精度的影响程度
方式 尺寸精度提升程度/(%) 椭圆长轴 椭圆短轴 正三棱柱体底边 正四棱柱体底边 未补偿 0 0 0 0 方式一 49.78 65.00 15.12 92.50 方式二 69.06 94.00 20.93 98.75
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