Which shot-peening machine is best suited for the peening of gears?

The following shot peening machines are suitable for strengthening gears, each with its own specific characteristics:

**Crawler-type shot peening machine:** This machine is particularly well-suited for the surface cleaning and strengthening of medium-to-large components, as well as for mass production. During the gear strengthening process, the rotation of the crawler mechanism drives the gear; this protects the gear from damage while ensuring uniform coverage of the gear surface. These machines are typically equipped with a separation system to precisely control the shot-to-sand ratio, guaranteeing effective shot impact on the gear surface and thereby significantly enhancing the gear's bending fatigue life.

**Hook-type shot peening machine:** Hook-type machines are suitable for cleaning or strengthening the surfaces of various small-to-medium castings, weldments, and heat-treated parts. For gear strengthening, they are particularly ideal for complex gear geometries that are unsuitable for tumbling processes—such as delicate or thin-walled gears. They effectively remove residual sand, core sand, and scale from gear surfaces, thereby improving fatigue strength and surface quality.

**Rotary table shot peening machine:**

Rotary table shot peening machines are primarily suited for the surface cleaning and strengthening of small-to-medium-sized components. They remove rust and contaminants via shot peening, thereby enhancing fatigue strength and preventing deformation or fatigue failure during subsequent service. For gear strengthening, rotary-table shot blasting machines ensure uniform surface cleaning and strengthening, thereby extending service life and enhancing performance.

Selection Guidelines

When selecting a shot blasting machine, it is essential to comprehensively consider factors such as the size, shape, and quantity of the gears, as well as specific strengthening requirements. Here are a few recommendations:

For strengthening large to medium-sized gears or batches of gears, a tumble-belt (crawler-type) shot blasting machine is a suitable option.

For irregularly shaped gears or gears unsuitable for tumbling, a hook-type shot blasting machine may be selected.

A rotary-table shot blasting machine is also suitable for strengthening small to medium-sized gears.

Additionally, attention should be paid to the quality of the equipment and the availability of after-sales service to ensure the chosen machine meets production needs and remains in good working order.