What is the difference between investment casting and forging?
Investment casting is a manufacturing process that creates a finished part by filling a ceramic mould with molten metal. In contrast, forging involves shaping metal by applying compressive forces with a hammer or press. Investment casting and forging are two very different manufacturing methods and while both methods can be used to produce high-quality parts, they differ in their approach and the properties of the final product. In this blog, we’re going to talk about the things that distinguish investment casting and forging from each other, helping you decide which is better suited to your project’s requirements. Let’s start by breaking down the definitions of each.
What is investment casting?
If our name hadn’t given it away already, we are specialists in investment casting, also known as lost-wax casting. Investment casting is a manufacturing process that involves creating a wax pattern of the desired part and then encasing it in a ceramic mould. The wax is melted out of the mould, leaving a cavity that is filled with molten metal. Once the metal cools and solidifies, the ceramic mould is broken away, leaving behind the finished part.
What are the advantages of using investment casting?
One of the biggest advantages of investment casting is its ability to produce intricate and complex parts with high accuracy and surface finish. The process is particularly useful for creating parts with thin walls or complex geometries that are difficult to achieve with other manufacturing methods. It’s also a cost-effective way to produce small to medium-sized production runs.
What is forging?
Forging is a manufacturing process that involves shaping metal by applying compressive forces with a hammer or press. The metal is heated until it’s pliable and then shaped into the desired form using a die. Forging is a hot-working process, which means the metal is worked at high temperatures to increase its ductility.
What are the advantages of using forging?
Forging is commonly used to create parts that require high strength and durability. It’s particularly useful for creating parts that need to withstand heavy loads or impact forces. The process can produce parts in a range of sizes, from small components to large structural parts.
Things to consider when deciding between using forgings and investment castings.
The main difference between investment casting and forging is the way the metal is formed. Investment casting involves pouring molten metal into a mould, while forging involves shaping metal through compressive forces. As a result, parts made through investment casting are typically more intricate and have a higher surface finish.
Which is better, investment casting or forging?
To answer this, you need to understand your project and what you want to achieve. Investment casting usually costs less and offers more versatility, but as investment casting specialists, we’re probably a little bit biased!
Here is a direct comparison between the two methods to help you see the differences at a glance:
Cost
FORGING: Tends to be very good value if you have a big production run.
INVESTMENT CASTING: Usually less expensive than forging, but it depends on the specific casting method used.
Material
FORGING: The selection of alloys that can be used is limited.
INVESTMENT CASTING: Compatible with nearly all types of alloy.
Product Size
FORGING: Can be limited, the larger something is the harder it is to forge.
INVESTMENT CASTING: A wide range of sizes is possible.
Tolerance
FORGING: Suited to basic shapes, but not at all suited to complex products.
INVESTMENT CASTING: The ability to handle tight tolerances makes this perfect for intricate parts.
Finishing
FORGING: Forgings can often be very rough and need a lot of finishing.
INVESTMENT CASTING: Creates a product that will usually require very little finishing.
Conclusion
Investment casting and forging are two very different manufacturing methods used to create metal parts. The method you choose depends on your requirements. If you are looking for cost-effective, highly intricate parts that can be made out of a range of metal alloys, investment casting is the process for you!
If you’d like to chat with one of our team about your investment casting needs, call us on 0161 925 5160 or send us a message via our contact form. With over 70 years’ experience, we have become the ‘go to’ in our industry for specialist, high integrity, precision castings for a wide range of industries, characterised by a common feature of security and safety-critical.