Difference Between High Pressure Die Casting Low Pressure Die Casting


If you’re new to the industry, you might think that casting is a set process, with few variables. In fact, there are many types of casting available, each with distinct advantages and disadvantages. Take, for example, high pressure casting and low pressure casting—two variations on a similar concept that are used for very different applications.

High Pressure Casting in Ohio

High pressure die casting is a common manufacturing process that relies on the injection of a molten metal into a die casting machine. We use force in this process, resulting in significant pressure in the steel mold or die.

There are a few distinct advantages to this approach:

  • Dimensional accuracy. Components made with the high pressure die casting process have high dimensional accuracy, which means they have very smooth surfaces, and require no additional machining (in most cases). All they need is the removal of flash around the edges, and some possible drilling.
  • Speed. High pressure casting is also a fast process. If you need lots of parts (i.e., 10,000 or more) created in a short period of time, this may be the most advantageous option.
  • Cost-efficiency. High pressure casting is also a cost-efficient process, due to its accessibility and its speed. This makes it ideal for producing jobs on a budget.
  • Thin walls. High-pressure casting is ideal for components that require thin walls, since low pressure casting has a minimum wall threshold.

Low Pressure Casting in Ohio

Low pressure casting relies on a vertically aligned machine, with the halves of the die attached to both a fixed and a moving machine plate. Here, the molten metal is pushed up through an intake port to the main die chamber. Though permanent molds are common here, it’s also possible to use a sand mold.

Once the die is filled, the pressure is maintained, and more molten metal is added to account for shrinkage and ensure even solidification from top to bottom.

As you might expect, there are advantages to this approach as well:

  • High strength values. Because low pressure casting ensures the even solidification of the metal, it generally has higher strength values than its high pressure counterpart. This makes it ideal for producing supporting components.
  • Better tolerance for complex shapes. Low pressure casting allows for the use of sand molds, which means it’s easier to account for complex shapes and geometries. If your component is complex, low pressure casting is more reliable.
  • Easy automation. The machine and die setup for low pressure casting is less complicated than the one for high pressure casting, making this process easy to automate.
  • Higher material utilization. There’s also no need for feeders; low pressure casting in Ohio has higher material utilization than other methods.

If you’re ready to get more information on high pressure and low pressure casting in Ohio, or if you’re ready to get a quote, contact Alumalloy today! We have engineers standing by to help you choose the right method for your next project, and give you some of the best prices in the area.

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