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Magnetic Shields Ltd - Kent, UK

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Magnetic Shields Ltd
Web Site:
Kent, UK
Custom Built Dual Aquablast Unit
Case study overview
What The Customer Says: 

“We are able to put a course media in one side of the machine, to remove marks and ridges, and a finer abrasive on the opposite side to allow for a cosmetic finish The guillotine door separates the two wash chambers, so we can use both of them at the same time. We are also able to open up the door to create one large wash chamber for bigger components. The machine really is ideal for our needs.”

Established over 55 years ago, Magnetic Shields Ltd specialises in manufacturing magnetic shields for companies and organisations worldwide.

Components that require shielding are those that are sensitive to magnetic and electrical fields, such as transformers, motors and magnets. These, and other components, are found in a variety of different industries such as aerospace, military and electronics. These types of components require low frequency magnetic shielding in order to prevent them becoming faulty and defective.

Magnetic Shields' customers include a number of Formula 1 teams, CERN, the particle physics laboratory in Geneva, as well as customers who use the products for space applications.

The shields are usually made from Mu-Metal®, which is a very high permeability alloy containing Nickel, Molybdenum and Iron which is extremely effective at screening low frequency magnetic fields. The magnetic shields can vary in size, with some of the smallest pieces of equipment being just 1.5cm³, and the largest being rooms or chambers which can be several metres in width and length.

Magnetic Shields' customers are constantly seeking higher levels of surface finish for their products, and therefore decided that it required a new method of finishing some of the shields before they were given a final heat treatment in the manufacturing process. Magnetic Shields reviewed a range of options for surface finish and decided the best option was a custom built Aquablast machine from Vixen Surface Treatments.

Peter Harden, production director at Magnetic Shields, said: “We required an effective machine that could remove small surface marks and weld discolouration from the shields.

“We had initially tried sandblasting the parts, but found that it was too harsh on the shields, and the finish was far too coarse - this ultimately resulted in damage. After research into wetblasting, we realised that this was a far better option and contacted Vixen to help us with our application.”

Vixen worked closely with Peter and the team at Magnetic Shields, and came up with the idea of designing and building a custom built Aquablast machine specifically for their application.

The custom machine consisted of two Aquablast 1215 machines joined together with a pneumatic guillotine door between them. The machine also has a 700mm turntable complete with a track, to allow a pass-through facility from one side of the machine to the other. This design enables the team at Magnetic Shields to use two types of media in either side of the machine.

To view the full case study click the following link:

® Mumetal is a registered trademark of the Carpenter Technology Corporation

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