功能梯度材料快速成形过程建模与控制
发布时间：2019-06-19 18:15
【摘要】：在三坐标雕刻机上开发出一种功能梯度材料增材制造装置,在低于水的凝固点温度下,将两种材料的水基膏体以一定比例进行挤出沉积,形成梯度材料零件。在该三维零件沉积成形过程中,配置好的材料不可避免地会存在结块和气泡现象,当结块分解或气泡释放时,会导致沉积过程中的挤压力不断变化,使得成形过程不稳定,成形零件质量差。在分析三维梯度材料沉积成形过程的干扰因素的基础上,通过实验建立了沉积过程中挤压力的动态模型,采用最小二乘方法进行系统辨识,完成了最小方差自适应挤压力控制器的设计,并用两种不同颜色的腻子粉(CaCO3)进行实验,验证了功能梯度材料快速沉积原理的可行性和控制器的有效性。
[Abstract]:A functionally graded material increasing device was developed on a three-coordinate engraving machine. At a temperature lower than the freezing point of water, the water-based paste of the two materials was extruded and deposited in a certain proportion to form gradient material parts. In the process of deposition and forming of the three-dimensional part, the caking and bubble phenomenon will inevitably exist in the configured material. When the caking decomposition or bubble release, it will lead to the continuous change of extrusion pressure in the deposition process, which will make the forming process unstable and the quality of the forming part poor. Based on the analysis of the interference factors in the deposition process of 3D gradient materials, the dynamic model of extrusion pressure in the deposition process is established through experiments. The least square method is used to identify the system, and the design of the minimum variance adaptive extrusion pressure controller is completed. The experiments with two different colors of putty powder (CaCO3) verify the feasibility of the rapid deposition principle of functionally graded materials and the effectiveness of the controller.
【作者单位】： 西安理工大学机械与精密仪器工程学院;
【分类号】：TB34
[Abstract]:A functionally graded material increasing device was developed on a three-coordinate engraving machine. At a temperature lower than the freezing point of water, the water-based paste of the two materials was extruded and deposited in a certain proportion to form gradient material parts. In the process of deposition and forming of the three-dimensional part, the caking and bubble phenomenon will inevitably exist in the configured material. When the caking decomposition or bubble release, it will lead to the continuous change of extrusion pressure in the deposition process, which will make the forming process unstable and the quality of the forming part poor. Based on the analysis of the interference factors in the deposition process of 3D gradient materials, the dynamic model of extrusion pressure in the deposition process is established through experiments. The least square method is used to identify the system, and the design of the minimum variance adaptive extrusion pressure controller is completed. The experiments with two different colors of putty powder (CaCO3) verify the feasibility of the rapid deposition principle of functionally graded materials and the effectiveness of the controller.
【作者单位】： 西安理工大学机械与精密仪器工程学院;
【分类号】：TB34
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1 高彦峰,王秀峰,罗宏杰;功能梯度材料中的渗流现象及其模型研究[J];陶瓷工程;2000年06期
2 徐智谋,郑家q，
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