Common post-processing methods for metal 3D printed parts|

3D printing has the advantages of realizing complex shapes, low cost and short lead time when making prototypes or small batches. However, limited by the current technological level, 3D printed parts have shortcomings such as rough surface and insufficient finish. Therefore, 3D printed parts often require post-processing to improve surface quality. Today, I will introduce the post-processing methods of commonly used metal 3D printing parts.

hand polished

This method is suitable for all kinds of 3D printed parts, but it is laborious and time-consuming to grind metal parts by hand.

sandblasting

One of the commonly used metal grinding processes, it is suitable for metal 3D printing parts with not very complicated structure.

Adaptive Grinding

A new type of grinding process that uses semi-elastic grinding tools, such as spherical flexible grinding heads, to grind metal surfaces. This process can grind some relatively complex surfaces, and the surface roughness Ra can reach below 10nm.

laser polishing

Laser polishing is a new polishing method that uses a high-energy laser beam to re-melt the surface material of a part to reduce surface roughness. At present, the surface roughness Ra of parts after laser polishing is about 2~3μm. However, the price of laser polishing equipment is relatively high, and its use in metal 3D printing post-processing is still relatively small (it is still a bit expensive).

chemical polishing

Using chemical solvents, parallel solvents are applied to metal surfaces. It is more suitable for porous structure and hollow structure, and its surface roughness can reach 0.2~1μm.

Abrasive Flow Machining

Abrasive Flow Machining (AFM) is a surface treatment process that uses a mixed liquid doped with abrasives that flows under pressure over a metal surface to deburr and polish the surface. It is suitable for polishing or grinding metal 3D printing parts with complex structures, especially for grinding grooves, holes and cavities.