Die casting is a manufacturing process for producing fi […]
Die casting is a manufacturing process for producing fine, clearly defined smooth or textured surface metal parts. This is achieved by forcing the molten metal into a reusable metal mold under high pressure. The process is usually described as the shortest distance between the raw material and the finished product. The term "die casting" is also used to describe the finished product.
How die casting is produced? First, it is necessary to produce steel molds that can produce thousands of castings quickly and continuously in at least two parts to allow removal of the castings. These parts are securely mounted in the machine and are arranged such that one is stationary (fixed half mold) and the other is movable (syringe half mold). In order to start the casting cycle, the two mold halves are tightly clamped together by the die casting machine. The molten metal is injected into the mold cavity to rapidly solidify it. The mold halves are separated and the castings are ejected. The die-casting mold can be simple or complex, with a movable slider, core or other part, depending on the complexity of the casting.
To date, the complete cycle of the die-casting process is the fastest speed for the production of precision non-ferrous metal parts. This is in stark contrast to sand casting, which requires a new sand mold for each casting. Although the permanent mold process uses iron or steel molds instead of sand, it is quite slow and is not as accurate as die casting.
Regardless of the type of machine used, the mold, core and / or other movable parts must be securely locked in place during the casting cycle. Typically, the clamping force of the machine is controlled by (a) the projected surface area of the casting and (b) the pressure used to inject the metal into the mold. Most machines use a toggle mechanism that is actuated by a hydraulic cylinder to achieve locking. Others use the direct acting hydraulic. The safety interlock system is used to prevent the mold from opening during the casting cycle.
The large or small die casting machine is only substantially changed in the method used to inject the molten metal into the mold. These are classified and described as hot or cold chamber die casting machines.