Precision Metal Machining Services Aluminum Parts Die Casting
How Injection Molding works?
Die casting uses high pressure to push liquid metal into a precision metal mold cavity at high speed, “almost the same as plastic”. Metal die casting is the metal liquid under pressure under the action of cooling solidification and forming castings. Cold chamber die casting and hot chamber die casting are two basic methods of die casting process. In cold chamber die casting, liquid metal is poured into the pressure chamber by manual or automatic pouring device, and then the injection punch is advanced, and the metal is hydraulically injected into the model chamber. In the hot chamber die casting process, the chamber is perpendicular to the crucible, and the metal liquid flows into the chamber automatically through the feed port on the chamber. The injection punch moves downward to push the metal liquid through the gooseneck into the cavity. After the metal solidifies, the product is formed, the die casting mold is opened, the casting is removed, and a die casting cycle is completed.
Die casting is a precision casting method. The dimensional tolerance of die castings cast by die casting is very small and the surface accuracy is very high. In most cases, die castings can be assembled and applied without turning, and threaded parts can also be cast directly. The main characteristics of die casting different from other casting methods are high pressure and high speed.① Liquid metal fills the cavity under pressure and crystallizes under higher pressure. The common pressure is 15-100mpa.② The metal liquid fills the mold cavity at a high speed, usually at 10-50 M / s, and some can exceed 80 m / S. (the linear speed of introducing the mold cavity through the inner gate – the speed of the inner gate), so the filling time of the metal liquid is very short, and the mold cavity can be filled within about 0.01-0.2 seconds (depending on the size of the casting).
Advantages
Mold and mold related components are very expensive for it. This process is only applicable to metals with high fluidity, and the casting quality must be between 30g and 10kg. There will be pores, so no heat treatment or welding can be carried out.
Materials for Die Casting
| aluminum die casting | Zinc die casting |
|---|---|
| A356.0 | ZA-2 |
| A360.0 | ZA-3 |
| A380.0 | |
| A383.0 (ADC12) | |
| A413.0 |