| 摘要: |
| 为了满足航天器大型复杂薄壁镁合金构件减重与快速制造需求，以某镁合金电子舱体为例开展了熔模铸造工艺研究。通过选区激光烧结（SLS）3D打印技术制备了舱体熔模，设计了3种浇注系统，采用ProCAST软件对舱体的低压铸造过程和铸造缺陷进行了模拟。研究结果表明，3D打印的聚苯乙烯熔模在烧除过程中未导致型壳胀裂问题的出现。低压铸造结合缝隙式浇注系统可满足镁合金熔体的平稳充型和完全补缩，实现了镁合金舱体铸件的快速熔模铸造成形。 |
| 关键词: 颗粒陶瓷增强钛基复合材料 磨削仿真 表面形貌 |
| 基金项目: |
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| Surface Morphology Simulation and Experimental Study of Grinding for Ceramic Particles Reinforced Titanium Matrix Composite |
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Zhao Yaobang1, Chen Wenqi1, Ouyang Zipeng1, Li Zhongquan1, Liu Gongyu2, An Qinglong2
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1.Grinding simulation of ceramic particles reinforced titanium matrix composite materials using single diamond abrasive is conducted in Deform-3D. Based on the simulation results, the cracks initiation and propagation rules on sub-surface of ceramic materials are obtained, and the grinding surface morphologies under different processing parameters are analyzed. Besides, the grinding experiments of composite materials are carried out with a resin bonded diamond grinding wheel, in order to study the effects on grinding surface morphology by different ceramic grain sizes and grinding processing parameters. After that, the grinding surface roughness under different processing parameters is also measured and analyzed. It is concluded that the simulation result is similar to that of experiment. The surface quality of composite materials with ceramic grain diameter 40μm is better than that with ceramic grain diameter 80μm. When the linear velocity of grinding wheel is 25m/s and feed speed of workpiece is 12m/min, brittle breaking on grinding surface of composite materials occurs less, resulting in better surface quality. As for the surface roughness, it is of dual influence by the linear velocity of grinding wheel and feed speed of workpiece along the laser manufacturing direction. While in the direction perpendicular to the laser manufacturing, grinding surface roughness will get smaller with the linear velocity of grinding wheel increasing or the feed speed of workpiece decreasing.;2. School of Mechanical Engineering, Shanghai Jiao Tong University
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| Abstract: |
| 使用Deform-3D软件开展了单颗金刚石磨粒磨削颗粒陶瓷增强钛基复合材料的过程仿真，研究了复合材料磨削亚表面裂纹的萌生与扩展规律以及不同工艺参数对磨削表面形貌的影响；开展了树脂结合剂金刚石砂轮磨削复合材料的实验，分别研究了不同陶瓷颗粒粒度与磨削工艺参数对磨削表面形貌的影响规律，对不同工艺参数下的磨削表面粗糙度进行测量与分析。结果表明，试验结果与仿真结果较为一致；陶瓷颗粒粒度为40μm的复合材料磨削表面质量明显高于陶瓷颗粒粒度为80μm的复合材料。当砂轮线速度为25m/s、进给速度为12m/min时，磨削表面质量最优；在沿复合材料激光制备方向上的磨削表面粗糙度受砂轮线速度和工件进给速度的双重作用，而垂直于激光制备方向，表面粗糙度随砂轮线速度的增加或工件进给速度的降低而有所减小。 |
| Key words: ceramic particles reinforced titanium matrix composite grinding simulation surface morphology |
