Magnetic cylinders in shot blasting

In foundries, shot blasting is a key surface preparation and cleaning process. However, the presence of foundry sand can pose a significant challenge because it can contaminate the steel shot and reduce the effectiveness of the shot blasting process. In this article, we will discuss a specialized component of shot blast machines designed to solve this problem: magnetic cylinders.

Foundry sand is an essential element in molding processes, but during shot blasting it becomes a contaminant. When mixed with steel shot, it may cause premature wear of the machine and reduce the effectiveness of the cleaning process. In short, foundry sand is the worst enemy of a shot blasting machine in a foundry environment.

To counteract the harmful effects of foundry sand, some shot blast machines are equipped with magnetic cylinders. These cylinders are designed to attract and retain magnetic steel shot (shown in blue for visualization purposes) while allowing non-magnetic foundry sand (shown in red) to fall under the influence of gravity.

Magnetic cylinders are typically placed behind a traditional air separator, another item you may learn about in another article. When the mixture of steel shot and foundry sand passes through these magnetic cylinders, the steel shot sticks to the cylinders due to its magnetic properties. Foundry sand, being non-magnetic, does not attract the cylinders and falls, effectively separating the two materials.

The ability to separate steel shot from foundry sand is crucial for several reasons:

1. Machine durability: Sand can cause abrasion and damage the internal components of the shot blasting machine. Removing it extends the life of the machine.

2. Process efficiency: Contaminants such as sand can reduce the effectiveness of steel shot, requiring more time and resources to achieve the desired surface finish.

3. Savings: Extending machine life and improving process efficiency can result in significant savings over time.

Although magnetic cylinders are very effective, they are not a one-size-fits-all solution. Different foundry applications may require different magnetic forces or cylinder sizes. Therefore, it is important to consult with experts to determine the most appropriate configuration for your specific needs.

Magnetic cylinders in shot blast machines offer a specialized solution to a long-standing challenge in foundry applications. By effectively separating magnetic steel shot from foundry sand, they maintain the integrity of the shot blasting process, extend machine life and contribute to overall cost savings. Whether you're new to the world of foundry shot blasting or looking to optimize your existing operations, understanding the role and benefits of magnetic cylinders can be a game changer.

The purpose of this article is to provide a detailed understanding of this specialized component, providing valuable information to those new to the foundry shot blasting process.