While die casting processes share many steps, there are subtle differences between them. These differences matter. They can affect the finished results you get on your products and what you can do with them later.
In some cases, vacuum pressure die casting has benefits that other methods don't have. How does this process work and when is it the best solution?
What Is Vacuum Pressure Die Casting?
All die casting methods work in the same basic way. Molten metal is placed into shaped moulds to create finished metal parts and products.
Each method has a different way of getting the metal into a mould and casting it. Vacuum pressure casting introduces a vacuum to the process both before the metal goes into the mould and when it is inside it.
Here, the vacuum effect forces air and gas out of the molten metal. So, the finished product won't contain any bubbles or gas particles.
Why Use Vacuum Pressure Die Casting?
Sometimes, it doesn't much matter if cast metal parts contain some air bubbles or gas residues. Even if they contain these things, the parts are strong enough to do their job.
However, sometimes, air bubbles and gas cause problems in parts after manufacture. For example, if you're casting products that will go through heat treatment or welding later in the manufacturing process, then air and gas affect your finished results.
When you heat up a cast object that contains air or gas bubbles, then these expand as the metal gets hot. This affects the composition and surface area of the metal.
You're likely to see external disfiguration or damage such as blistering after the heat treatment or weld. The metal is more prone to damage when it is heated if it doesn't have complete internal density.
Vacuum pressure die casting removes this problem simply because it removes air and gas from the metal. It reduces the metal's porosity.
After this treatment, cast products become stronger and denser; they can go through high heat post-production without any resulting surface damage. If you need your parts or products to look perfect at the end of the production process, then this method is most likely to deliver the results you want.
For more information about choosing the right process for your parts, contact die casting companies. They can tell you more about vacuum pressure solutions and whether this is the best option to take.