CONVENTIONAL vs. MULTI-SLIDE DIE CASTING
A conventional hot chamber die casting tool is usually made at two die halves: a fix die half and an ejector die half. When the die casting machine clamps together, the two die halves are locked and held together by the machine’s hydraulic pressure. The surface where the ejector and fixed halves of the die meet and lock is referred to as the die parting line. Once the dies are clamped together, an injection process takes place in the fixed die half. The cavity is fed through a sprue and runner system. This cavity is filled with liquid metal each time a shot is made. It is common practice to add overflows to vent the tool to avoid trapping air during the injection process. Although this conventional die casting technology has become one of the dominant methods people make parts, it still has its drawbacks. The ratio of part weight to scrap is too high. The tooling is expensive and its high energy consumption rate, are all examples of this conventional technology’s disadvantages.
Multi-slide hot chamber die casting helps solve these problems. Instead of using two die halves, Multi-Slide die casting machine consists of two to six slides all moving independently, and each with its own die blocks. When the die casting machine closes, the die blocks form a complete cavity to inject the material. Instead of feeding the cavity through a sprue and runner system, it is directly injected through the parting line, thus eliminating the need of the sprue.