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New Continuous Feed Shot Blast Machine for Small, Delicate Castings

| Editor: Isabell Page

The new compact troughed belt continuous shot blast system THM 300/1 was especially developed for processing high volumes of small, delicate work pieces. The new design combines the small footprint of batch machines with the advantages of continuous feed operation and, thus, helps streamline and speed up the blast cleaning processes for small castings.

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The troughed belt blast machine THM 300/1 is ideal for continuous feed blast cleaning of small work pieces. To demonstrate the work piece variety this machine can handle, for the photo different components were placed on the troughed belt.
The troughed belt blast machine THM 300/1 is ideal for continuous feed blast cleaning of small work pieces. To demonstrate the work piece variety this machine can handle, for the photo different components were placed on the troughed belt.
( Source: Walther Trowal )

Walther Trowal developed the THM 300/1 specifically for small, delicate or thin-walled cast work pieces like, for example, aluminum or zinc die castings with diagonal dimensions of between 20 and 150 mm (about 0.8 to 6.0”). Work pieces can range from components for toys (model cars and trains), furniture parts, components for the computer industry and even small automotive parts.

For the first time a shot blast machine for processing small work pieces is available with the footprint of a batch tumble belt machine that permits, however, continuous feed operation. Compared to the smallest THM machines supplied to date by Walther Trowal, the THM 300/1 design is considerably more compact: It requires an area of only 1,4 × 2,7 m (5 x 9 feet) and can, therefore, be easily integrated into existing production lines.

With this new machine concept Walther Trowal meets the demands of customers in the foundry industry, who want to integrate their blast cleaning operations seamlessly into already existing manufacturing lines.

The troughed belt work piece transport system Walther Trowal is utilizing for its continuous shot blast machines is gently moving the work pieces through the machine in a spiral motion. This ensures that all work piece surface areas are equally exposed to the blast media stream.

Meik Seidler, sales manager at Walther Trowal, recognizes a significant trend towards continuous shot blasting: „The THM continuous feed machines with their unique troughed belt work piece transport system are more and more displacing the conventional batch tumble belt machines. Our customers integrate the THM systems into linked manufacturing processes allowing them to significantly simplify the work piece handling. The work pieces are continuously fed into the machine at preset cycle times determined by the actual production volume. Intermediate transport operations from one process stage to the next, as well as intermediate storage, are completely eliminated.”

The compact troughed belt continuous shot blast system THM 300/1 combines the small footprint of batch machines with the advantages of continuous feed operation
The compact troughed belt continuous shot blast system THM 300/1 combines the small footprint of batch machines with the advantages of continuous feed operation
( Source: Walther Trowal )

For the new blast system Walther Trowal is using the newly developed WTY turbines with curved throwing blades. Compared to conventional blast turbines they generate a substantially higher throwing speed. This increases the impact energy of the blast media on the work pieces, which in turn helps reduce the processing times.

A communication processor allows integrating the shot blasting operation into higher-level process controls. Explosion protected dust collectors ensure safe operation in line with prevailing explosion prevention standards.

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