Frequently Asked Questions
QC-10 Aluminum has outstanding hardness and strength for increased mold life. The myth that aluminum molds are only for prototypes and limited production is false. Tool life is the subject of debates and it is clear that the factors that affect tool life include:
-plastic resin type
-molding conditions / environment / training required when running AI molds
You can mold most filled and unfilled resins in our aluminum molds.
Yes, there are several types of aluminum but the 6000 and 7000 series alloys are the most common. AIM designs and builds injection mold tooling utilizing Alcoa’s QC-10® aluminum. QC-10® is a high hard type of aluminum mold plate and is an optimum material for a wide range of injection and blowmold applications. With a thermal conductivity near five times that of steel, QC-10® can improve production cycle times by up to 25%.
Aluminum tools must be treated with a bit more care than steel tools. They can be damaged with excessive clamp pressure, excessive injection pressure or by removing stuck parts without proper care. Things like a screwdriver should never be used. Training in the set-up, running and maintaining of aluminum molds is highly recommended. Cleaning is another important factor when running aluminum.
Yes, they can be polished to a near SPI #2 finish. With few exceptions, any texture added to a steel mold can be added to any aluminum mold. Any plating and coating can be added but the application temperature must be below 250°F.
When molding molten plastic into any mold the hope is that the plastic will cool evenly at the end of the molding cycle. If it does not, the hotter areas of the plastic, often caused by hot spots in steel molds will continue to shrink as they cool causing internal stress and that usually leads to parts that warp or are not flat or straight. Aluminum’s ability to manage temperature evenly across the surface of a mold completely eliminates hot spots.
We have customers who use aluminum molds for gas assist and also the Mucell process. The nature of the process is one where less injection pressure is required to complete the fill and uniform mold surface temperature is a must.
It is common for mold makers to not offer both steel and aluminum. If they do, the price and leadtime is often about the same. This is often because they build both types of molds with the same process no matter the metal. You will most likely get your best quote on steel from a steel mold-maker as you will get your best price on aluminum from an aluminum mold-maker.