Cores can be used to extend mold projections to create extra mold sections, or to block out and create negative drafts. Complex castings can involve the use of multiple cores.
Sand Core Making
Cores are produced by blowing, ramming or in heated processes, investing sand into a core box. The finished cores, which can be solid or hollow, are inserted into the mold to provide the internal cavities of the casting before the mold halves are joined. Sand cores are also widely used in die-casting, where permanent metal molds are employed.
Harrison Castings specializes in sand casting core making and produce complex cores for small and large castings for a wide range of applications and industries.
Facilities in Our Sand Core Making Shop
Harrison Castings’ core shop consists of 2 cold box core blowers ( a Loramendi with 25 litre capacity and a BZV with 15 litre capacity ) both with blowing times varying between 30 seconds and 2 minutes and a Triton (TS5) 3 tonne per hour free standing sand mixer.
The blowers can accommodate vertical or horizontally jointed core boxes, using Amine as a curing agent with the 2 part resin addition. Approximately 140 to 160 cores can be blown in a day.
There is a 6 bay carousel system in place, with a molding capacity of up to (50Kgs) producing 70 cores a day depending on size. These range from runner system cores to air intake manifold and water jacket cores.