Structural Parameter Optimization of Micro-flow ExtrusionNozzle in Ceramic 3D Printing
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摘要: 为了降低陶瓷3D打印机在打印过程中产生的挤出压力,在幂律模型的基础上推导出陶瓷浆料在挤出过程中产生的总压力与材料流变特性、挤出装置结构参数和挤出速度关系的数学模型。其中挤出喷头的结构参数是影响挤出压力的关键因素,在其它工艺参数相同的条件下,通过对数学模型进行计算可以确定实现最小压力的挤出喷头的结构参数组合。由试验验证可知,使用优化后的挤出喷头能有效地降低打印过程中产生的压力,并且能改善陶瓷零件的成形效果。Abstract: In order to reduce the extrusion force in the ceramic 3D printing, a model for the relationship between the extrusion force and the material rheological properties as well as the structure of the extrusion device and the extrusion of speed is derived on the basis of the Power-law fluid model. The structural parameters of the extrusion nozzle are the key factors affecting the extrusion force. Under the same conditions of other process parameters, the combination of the structural parameters of the extrusion nozzle that achieves the minimum extrusion force can be determined by calculating the model. It can be seen from the experimental verification that the optimized extrusion nozzle can effectively reduce the extrusion force generated in the printing, and improve the forming effect of the ceramic parts.
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Key words:
- 3D printing /
- extrusion force /
- Nozzle structure /
- power-law model
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表 1 计算结果
参数 数值 参数 数值 最小压力Pmin /Pa 5566.4 过渡段直径D/mm 6 料筒长度L0/mm 50 挤出头定形段直径d/mm 0.6 过渡段长度L/mm 4 料筒锥角β/(o) 40 挤出头定形段长度l/mm 1 挤出头锥角α/(o) 13 料筒直径D0/mm 30 表 2 试验安排表
试验组 d/mm l/mm D/mm a1 0.4 1 4 a2 0.4 3 6 a3 0.4 5 8 b1 0.5 5 6 b2 0.5 1 8 b3 0.5 3 4 c1 0.6 3 8 c2 0.6 5 4 c3 0.6 1 6 表 3 压力数据表
试验 实际压力/Pa 理论压力/Pa a1 13073 12018 a2 18398 18159 a3 43971 44388 b1 38528 37491 b2 8221 7818 b3 17312 17747 c1 12904 12156 c2 17250 18644 c3 5804 5566 -
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