NETSleeve® was specially developed to achieve the largest possible module when using risers or sleeves, without the need for specially designed breaker cores or metal sheets. The technology makes it possible to efficiently remove risers from the casting with a minimum of cutting and grinding.
NETSleeve® is the successful combination of conventional feeding technology with NET-Technology®. A traditional breaker core or metal sheet used to aid riser removal is replaced with a special refractory mesh, which lies flush to the base of the riser or sleeve. The net ensures a clearly defined, predetermined breaking point directly at riser/casting contact. The mesh systematically weakens the material to approximately 80% of the cross-sectional area, allowing the riser rest to be removed quickly and safely through the formation of a breaking edge “0” at the casting surface with the minimum of force.
“Since the application of NETSleeve® technology in our hand-molding process, the ease with which large castings pass through the cleaning department has improved, with the time taken for riser removal considerably reduced, which has allowed us to increase the throughput of castings by 100%“
In this example calculation you can see the time saved by using NETSleeve® TGCN 990o N15 (14 pcs per casting) with a riser contact of 50 mm. The casting material is EN-GJS 400-18LT.
Application Technology and Export Sales Manager
As application consultant and responsible for the export business of GTP Schäfer with more than 30 years of experience within the foundry industry, Nicholas Richardson has developed the NET-Technology® in green sand and steel casting.