POST-PROCESSING GRITS CLASSIFICATION

Post-processing grits are employed to clean, deburr, or texture components produced by traditional machining as well as by additive manufacturing. During use, the abrasive media is gradually worn, fragmented, and contaminated by broken particles and process residues. As a result, the working mix drifts away from its original particle size distribution, leading to changes in impact energy, surface roughness, and process consistency.

Classification of used grits allows recovery of a working fraction aligned with the required finishing specification, while removing both oversize fragments and fines. This operation ensures that the media retained in the process maintains a controlled granulometric fraction, which is critical for reproducible surface results and predictable equipment settings. At the same time, it optimises media consumption and reduces the frequency of complete media replacement.

Vibrating sieving is particularly suitable for this application, as it combines robust handling of dense, often angular grits with the precision needed to achieve fine cut points, down to about 30–40 µm. Key parameters such as mesh size, throughput, and installation point must be selected according to the type of blasting or finishing line, the target surface profile, and the characteristics of the media in use.

MLT Cuccolini VPB vibrating sieves are well suited for small to medium capacities or for dedicated recovery circuits serving individual blasting or post-processing cells. Typically installed downstream of media collection hoppers or conveying systems, VPB units can operate with multiple decks to separate oversize, on-spec grits, and fine particles in a single pass. Their compact design facilitates integration in retrofit projects and confined layouts.

For higher capacities or centralised media recovery systems, VPM vibrating sieves provide increased throughput while maintaining the same level of classification accuracy. Installed under silos or in connection with mechanical or pneumatic conveying, VPM machines deliver stable cut points even with continuous operation and variable feed conditions. Their calibrated vibration and robust construction make them suitable for intensive use with mineral or metallic grits.

Both VPB and VPM offer modular configurations and easy access for inspection and cleaning, supporting maintenance operations and quick mesh changes when different grit specifications are required. The ability to reach fine separations while handling abrasive products helps maintain a controlled working mix, supporting consistent finishing results across both conventionally manufactured and 3D-printed parts.

Using MLT Cuccolini VPB and VPM vibrating sieves for post-processing grits classification ensures a stable, on-spec media mix, improving surface finish quality, process repeatability, and overall equipment efficiency. Effective removal of oversize fragments and fines also protects downstream components, such as turbines, nozzles, and filters, reducing unplanned downtime and maintenance costs.

The flexibility to adapt mesh configurations, capacities, and layouts makes these solutions suitable for a wide range of mechanical finishing installations, from standalone blasting cabinets to complex automated finishing lines.

Contact MLT Cuccolini to discuss your post-processing grits classification needs and identify the most suitable vibrating sieving solution for your specific mechanical finishing application.