内容
设计师
Petri Mustonen阿尔托大学电子与纳米工程系
项目
铜箔的抛光对于高质量 CVD 石墨烯生长至关重要。这些箔片的冷轧制造过程在箔片表面留下了深的宏观条纹，以及许多微观缺陷。通常这些条纹和缺陷可以通过电化学抛光工艺去除。尽管这很容易手动完成，但随着箔片尺寸的扩大，箔片的弯曲就会成为问题。电极应尽可能直，以确保沿箔片的电流密度恒定，这是平滑抛光过程所需的。
该项目旨在用作保持箔笔直并允许轻松改变电极距离的工具。该模型由 OpenSCAD 制作，具有高度可定制性。
注意！您需要检查印刷材料的化学稳定性！我建议从聚丙烯 (PP) 和氟化乙烯丙烯 (FEP) 开始，检查它们是否适合您。
该项目是作者2017年秋季L3999课程的期末项目。
设计
概念
整个结构被放置在一个盒子的顶部，并在其中完成抛光过程。主支撑杆只是一个矩形块，其顶部有一个滑块。该滑块连接到一个螺钉，该螺钉也连接到主支撑杆，通过旋转该螺钉来移动滑块。第二滑块固定在支撑杆的一个位置上。两个滑块都连接到框架。这些框架之间钉有铜箔（箔片钉在框架的两半之间）。
下面的视频中有更详细的描述。
材料清单
- 底座支撑杆
- 带螺丝支撑的滑块（简称“主滑块”）
- 无螺丝支撑的滑块（简称“副滑块”）
- 坚果
- 拧紧
- 帧 x 4（每个“帧”仅为总帧的一半）
- 滑块框架-附件 x 2
- 框架销钉 x 8（将框架连接在一起）
- 滑块销 x 2（将辅助滑块固定到主杆上）
估计成本
37 克 PLA 和 8 克 PP（框架和连接销）=~1.5 美元 使用这些材料：https://web.archive.org/web/20210617213737/https ://gizmodorks.com/polyproprane-3d-printer-filament/ ~62.5 美元/1 公斤和https://web.archive.org/web/20220603014826/https://lulzbot.com/store/polymaker-polylite-pla-filament 25 美元/1 公斤。https://ecoreprap.com/filament/pla-filament/ $22/1kg
路线
- 从NIH 存储库下载 scad 和 STL 文件。默认的STL文件可容纳5x5cm的箔片，电解液与主支撑杆底部之间的距离为5cm。请注意，默认公差适用于 PLA！
- 如果不需要更改参数，则使用STL文件进行打印。如果需要更改参数，请使用每个 scad 文件中“参数”部分下的列表，然后使用“主要参数”列表。如果需要更多调整，请在 scad 文件中的“微调”下查找参数。
- 打印！我建议对附件（销钉）、框架、螺母和螺钉使用较小的层高（我使用 0.1 毫米）。其余的可以用更大的高度来完成（我用的是0.2mm）。其他变量是具有高细节打印功能的Lulzbot mini的默认变量（可在此处找到），并且还使用了 Lulzbot mini 打印机。
参数
许多参数都是可定制的，但是，这里列出了最重要的参数：
support_and_slider.scad
- bar_length主支撑杆的长度
- frame_hole_wr主支撑杆孔的摆动空间（宽度、高度）
- pin_radius_wr和pin_slit_width_wr连接销槽的摆动空间
框架.scad
- frame_size框架的外部尺寸（宽度、高度、厚度）
框架附加.scad
- pin_length将滑块连接到框架的销钉长度
slider_screw.scad
注意！必须在 data-metric_cyl_head_bolts.scad 文件中对 SCREW LENGTH 进行更改！
- Screw_name螺钉名称（来自 data-metric_cyl_head_bolts.scad 文件）
- 是否渲染线程（渲染会大大减慢预览速度）
可能出现的问题以及如何解决
I would recommend that you first print the screw, nut and main slider to check that they all connect together well. The side of the nut which is towards the printing pad is possibly smaller and this might need fixing, I peeled small pieces off of the nut with a hobby knife until the screw went through well. I would recommend to do this and not to go for a larger nut as it is better if the seal is tight and the screw does not wobble. Regarding this, it is also better that the sphere on the end of the screw is tightly in the slot on the main slider. If this wobbles it can be hard to keep the foil completely vertical. If the nut is too loosely in its slot (it moves around), then you need to change the "nut_scaling" parameter in the "Fine tuning" parameters section of "support_and_slider.scad" file.
The attachment pieces (pins and the frame attachment) can have printing issues due to the small size, warping can be expected. For PLA printing I used wood glue to get better adhesion on the printing pad. A raft or a brim can be used as well, but I found out that the complete removal of these structures can be an issue. This issue might arise with the frames as well, but for me it didn't happen enough for it to be a problem.
It can be hard to properly pin the second slider to the main support with the slider pins. If this is the case, then you can either try to make the fit better or you can use a thin PLA piece (I used a piece of a frame) and push it in between the slider and the support bar. This will probably hold the slider in place much better.
Future improvements
- More robust way of attaching the secondary slider to the support bar (screw type perhaps)
- Removal of excess plastic
- Unifying the slider-frame -attachment piece and one side of a frame to one structure
3D model parts
Attachment piece for attaching frame to sliders.
Nut for the screw.
Pins for attaching secondary slider to the main support bar.
For pinning foil in between two halves of a frame.
For changing the distance between two sliders.
Slider to which the polished foil is attached to.
One half of a complete frame in between which the foil is pinned to.
Main support bar for the entire structure.
Secondary slider for attaching second electrode.
Final Prints
Frames, frame pins and slider pins.
Sliders and frame-slider -attachment pieces.
Main support bar, screw and a nut.
Full model.
