磁性抛光对3D打印微结构的参数影响

对微结构精密加工时要能够控制高低不平的材料去除,以保证不破坏微结构原来的三维形貌特征。通过自行搭建的实验平台对3D打印出来的微结构工件进行抛光实验,主要研究了机床主轴转速、加工间隙、抛光时间和抛光路径等工艺参数对微结构抛光后的三维轮廓材料去除特性以及微结构的保形情况。实验结果表明:微结构保形系数随着抛光时间增加而变小,而主轴转速和加工间隙的变化对保形系数影响较小;采用等高线移动式抛光的保形系数比采用水平移动式大;相同工艺参数抛光对包体状和圆环阵列微结构工件保形效果较好,对三棱锥工件保形效果较差。国家自然科学基金(51675453);;深圳市科技计划项目(JCYJ20160517103720819

Study on Remove of Free-Form Surface Structure by Magnetic Polishing

磁性抛光因柔性工具的工件表面适应性高而具有较好的应用潜力。自行设计抛光工具头,制备磁性抛光体,搭建试验平台,并对不锈钢平面工件进行定点抛光试验,平均去除效率为0.231μm/10min,且工件表面质量得到了很大的改善,验证了该磁性抛光方法的可行性。继而对两种自由曲面结构工件进行抛光：一是采用工具头水平移动式、工具头等高线移动式两种不同的抛光进给运动方式对不同曲率的不锈钢工件进行抛光去除试验,试验证明：两种抛光方式对每个曲率的轮廓均有去除能力,去除量在0.14~1.33μm之间;二是对3D打印的光敏树脂微结构自由曲面定点抛光,单位时间去除效率在8.957~12.587μm/10min之间,且改善了轮廓的光滑度。初步试验表明,磁性抛光方法对两种自由曲面结构均有一定的去除能力,可进一步探索磁性抛光技术应用于自由曲面结构确定性抛光。Magnetic polishing technique has wide application potential due to the high adaptability of flexible tool to the workpiece surface. The relevant polishing tools were developed, and a test platform was established in the paper. The workpiece finish had been greatly improved after spot polishing on stainless steel flat parts, and the average removal efficiency was 0.231μm/10 min, which verified the feasibility of the magnetic polishing method. Then two kinds of free-form surface structures were polished by magnetic polishing method. First, stainless steel parts with different curvatures were polished by two different polishing feed movement ways. Experimental results showed that two polishing methods had the ability to remove the contours of each curvature, and the removal amount falls between 0.14-1.33μm. Secondly, the removal efficiency was between 8.957-12.587μm/10 min after spot polishing the microstructured free-form surface, and the smoothness of the contour is improved. Preliminary experiments showed that the magnetic polishing method had the ability to remove both free-form surface structures, so it can explore further magnetic polishing technology used in deterministic polishing of free-form surface structure.深圳科技计划项目（JCYJ20160517103720819

3D打印微结构工件的磁性复合流体抛光工艺研究

对微结构精密加工时需要能够控制高低不平的材料去除,以保证不破坏原有微结构的三维形貌特征.通过自行搭建的实验平台对3D打印出来的微结构工件进行抛光实验,主要研究了机床主轴转速、加工间隙、抛光时间和抛光路径等工艺参数对微结构抛光后的三维轮廓材料去除特性以及微结构的保形情况.实验结果表明:微结构保形系数随着抛光时间增加而变小,而主轴转速和加工间隙的变化对保形系数影响较小;采用等高线移动式抛光的保形系数比采用水平移动式大;相同工艺参数抛光对包体状和截面为半圆的圆环圆周阵列微结构工件保形效果较好,对正三棱锥工件保形效果较差.国家自然科学基金(51675453);;深圳市科技计划项目(JCYJ20160517103720819

疏浚泥浆排放对渔业生产的影响及其对策研究 Ⅱ.对鱼苗、鱼种呼吸代谢、血液生化指标和鳃组织结构的影响

以鲫、草鱼、鲢和团头鲂鱼种为材料，研究了疏浚泥浆对这些鱼类的耗氧率、血液学生化指标和鳃组织结构变化的影响。结果表明，在泥浆浓度０．０８－１．２４８ｇ／ｌ范围内，鱼种的耗氧率（Ｙ）与水体含泥量（Ｘ）呈线性相关，其关系式为：Ｙ鲫＝０．３３２４－０．０７４５Ｘ（Ｐ＜０．０１），Ｙ草鱼＝１．２０５４－０．４２０９Ｘ（Ｐ＜０．０１），Ｙ鲢＝１．６０５３－０．４９０５Ｘ（Ｐ＜０．０１）；在０．８０ｇ／ｌ（Ⅰ）和０．９６ｇ／ｌ（Ⅱ）泥浆水中驯养不同时间的鲫，回到清水中后其耗氧率表现为先升高后下降，与驯养时间（ｔ）呈显