Die cast parts and injection molded parts are both metal or plastic products formed through molds, but their production processes, molds used, and the characteristics of the final product are different.
The difference between die-casting parts and injection molded parts:
1. Differences in production processes
Injection molded parts: Injection molding is the main method of forming thermoplastic materials. Thermoplastics can be repeatedly heated and softened, cooled and cured, and is a physical process that is reversible. The production process of injection molded parts mainly includes steps such as melting, injection, cooling, and demolding.
Die casting: Die casting is the process of filling the mold cavity with liquid or semi liquid metal at an extremely high speed and solidifying under pressure to obtain a die casting. The production process of die-casting parts requires high injection pressure and thicker templates to prevent deformation at high speeds.
2. Differences in Mold Design
Injection mold: The sprue sleeve of the injection mold is a slender tapered feeding port, and the diameter of the feeding port is relatively small. Injection molds generally require quenching treatment to improve their hardness and wear resistance.
Die casting mold: The gate of a die casting mold is different from that of an injection mold, requiring a splitter cone to decompose the high pressure of the material flow. The core of the die-casting mold does not need to be quenched, because during die-casting, the temperature inside the mold cavity exceeds 700 degrees, which is equivalent to one quenching. Die casting molds generally require nitriding treatment in the cavity to prevent alloy sticking to the mold cavity. The clearance between the movable fitting parts of the die casting mold should be larger because the high temperature during the die casting process can cause thermal expansion.
3. Differences in product quality and characteristics
Injection molded parts: The dimensional stability of injection molded parts is good, and they can generally be vented by the ejector pin, parting surface, etc. The process parameters of the main inlet and outlet expansion sleeve for injection molded parts include barrel temperature, melt temperature, and mold temperature.
Die-casting parts: The surface treatment process of die-casting parts is relatively complex, and common defects include flow marks, cold water marks, scratches, and dents. The quality and characteristics of die castings are influenced by factors such as alloy composition, filling speed, and exhaust conditions.
4. Differences in post-processing
Injection molded parts: Injection molds are generally formed in one go, and the post-processing process is relatively simple, mainly including steps such as cleaning, drying, and assembly.
Die-casting parts: Many die-casting mold products are post process processed, such as tapping teeth, milling inner grooves and inverted hooks, etc. Additional processes may be required during the post-processing to repair or enhance the performance of the die casting.
