AIST: National Institute of Advanced Industrial Science and Technology
Comparison of Electropolishing method
|
items
|
Electropolishing（traditional way）
|
Elecro-abrasive Polishing
|
High Speed Electropolishing
|
| purpose | luster surface |
mirror suface at small amount
of removed surface |
remove of defect texture
r-shaped working deburring |
| objects |
mainly small parts
（difficulty for inside of parts) |
flat and curved suface,
inside and outside of circular cylinder |
wide area of flat sheet
inside of very small parts
die and mold |
| good points |
mass production at same time
|
high precision, high quality
mirror surface of nano meter level; mirror suraface not disturbing
flatness nor shape |
high efficiency |
| equipments |
big bath, big capacity of power source
big capacity of waste water treatment
|
compact equipment
small capacity of power source flexible design according to object |
flexible design according to object
|
| electrolytic solution |
strong acid or alkali
handle with care
|
sodium nitrate(NaNo3)
water solution of neutrality
|
same as left |
| working method |
electropolishing in stationary bath at low current density |
electro-abrasive polishing by rotating
tool at low current density |
electropolishing in fluid electrolytic
solution at high curent density |
| current density |
under 1A/cm2
|
under 1A/cm2 | over 50A/cm2 |
|
pat No.
|
name of invention
|
outline
|
| 1746920 | electro-abrasive polishing | electro-abrasive polishing for curved surface by rotating tool |
| 2077839 |
mirror surface polishing for inside
of small paipe |
electro-abrasive polishing for inside of small pipe using of
fabric sheet or loose abrasive |
| 2569425 | electro-abrasive polishing for stainless steel |
high mirror surface by electro-abrasive polishing using of
loose abrasive |
| 3044377 | improvement of luster for aluminum | high mirror surface for aluminum |
| 3082040 |
improvement of luster and efficiency
for aluminum |
high mirror surface at high efficiency for aluminum |
| 3348381 | high speed descaling process for stainless steel |
high speed and high efficient descaling by high current density of over 50A/cm2 |