Some customized parts need to be fabricated in order to make a pump. The design requires three techniques of lab-level fabrication, CNC machining, 3D printing and wire Electrical Discharge Machining (EDM).
POM is an engineering plastic used in a wide range of industries. Machining this material is very easy and the material has enough strength. The team used a CNC milling machine to make some parts.
POM plates |
CNC milling machine we used (Mimaki NC-5) |
In the design of the pump, CNC machining was used to make following two parts .(Download CAD data)
Oil Seal CasingPOM plate (Thickness: 7mm) |
|
Motor MountingPOM plate (Thickness: 15mm) Install five M2.5 insert screws (Ensat 302 000 025) on the side and two M3 insert screws (Ensat 302 000 030) on the bottom |
The team used the fabrication service because machining power is required compared to POM parts. (Download CAD data)
Rotor CasingAluminum A5052 Finish: sand blast |
Outlet CasingNylon 3D print The surface is colored with black dye. |
We used wire EDM for high precision machining of stainless steel and slide plates because wire EDM can cut the metal even if it is really hard. (Download CAD data) |
Wire EDM we used (Makino SP43) |
Stainless steel is suitable as a material of rotors. However, stainless steel is a difficult material for CNC machining. Precise machining is also required for rotors. Wire EDM is one of the best choices for rotor machining.
Out rotor and inner rotorStainless steel SUS303 plate (Thickness: 9.5mm) |
|
Shim ringStainless steel plate (Thickness: 1mm) |
To reduce the friction between rotors and casing, we set oil-less slide plates both sides of the rotors.
Cover slide plateDAIDYNE DDK05 slide plate (Thickness: 2.5mm) |
|
Bottom slide plateDAIDYNE DDK05 slide plate (Thickness: 2.5mm) |