What is Lost Wax Casting?
Lost wax casting uses a wax model of a product to create a finished cast metal object. The wax model, sometimes called a wax pattern, is coated in a ceramic slurry to create a shell. This is then heated to remove the wax and harden the shell. The empty shell is filled with molten metal, which solidifies to create the final product.
Lost wax casting, sometimes known as the investment casting process, is a popular technique used to create cast metal parts for a range of sectors and uses. It is an ancient method that has been used for thousands of years to create detailed and intricate components. In this blog post, we will explore what is lost wax casting, how lost wax castings are made, and why this technique is so important in precision investment casting.
The history of lost wax casting.
Lost wax casting is a technique that has been used for thousands of years to create objects out of various metals.
It’s earliest known use dates back to around 3700 BCE in Mesopotamia, where artisans used the technique to create bronze objects. Over time, the technique spread to other parts of the world, including ancient Greece, Egypt, and China.
In ancient Greece, lost wax casting was used to create bronze sculptures, including some of the most famous works of art in history, such as the bronze statues of athletes found at the Olympic Games. In Egypt, it was used to create intricate jewellery, including amulets and necklaces.
Lost wax casting continued to be used throughout history, including during the Renaissance period in Europe, where it was used to create bronze sculptures by artists such as Donatello and Michelangelo.
Today, the process is still widely used in various industries, including manufacturing. While the materials and techniques may have evolved, the basic principles of lost wax casting remain the same, making it an enduring and versatile technique for creating very precise metal objects.
How are lost wax castings made?
Model Creation: The first step in the process is to create a wax model of the component that needs to be cast. The model is created using our in-house wax thermojet 3D printers.
Mold Making: The wax model is then used to create a mould. This is done by repeatedly dipping the wax mould into a high-grade ceramic slurry. The layers build to form a thick outer shell. The mould can be made in two or more parts, depending on the complexity of the model.
Wax Removal: Once the mould is complete, the wax model is removed by melting it away in a high-pressure steam boiler. This leaves behind a negative space in the mould that is the exact shape and size of the original model.
Pouring: Molten metal is then poured into the hollow investment shell, filling the negative space left by the original wax model.
Cooling and Removal: The metal is allowed to cool and solidify in the mould. Once the metal has cooled, the investment is broken away, revealing the cast metal object.
Finishing: The cast metal object is then finished, which can include grinding, polishing, and any other necessary steps to achieve the desired final product.
Why is it called lost wax casting?
Once the mould is heated and the wax melts away, the wax is “lost,” leaving behind a space in the mould that is then filled with molten metal to create the final object.
In other words, wax is a temporary material that is used to create the mould, but it is destroyed or “lost” in the process of creating the final object. This is why the process is called “lost wax casting.”
What components can be made using the lost wax casting process?
We operate in a wide range of industry sectors:
Each of these industries has their own specific requirements for components that can be made with the lost wax process, click the links for more information on each of these industries.
What are the main advantages of using a lost wax casting process?
Lost wax casting is a highly precise and versatile technique that offers many benefits in the precision engineering sector. Here are some of the key advantages:
Accuracy: it allows for the creation of highly precise and complex shapes with very tight tolerances. This makes it an ideal choice for producing parts and components requiring high accuracy and consistency levels.
Reproducibility: it enables the production of identical copies of a given part or component, making it ideal for the mass production of parts with high dimensional accuracy.
Versatility: it can be used to produce parts and components made from a wide range of metals, including aluminium, copper, bronze, and stainless steel. This makes it a versatile technique that can be used across a variety of industries and applications.
Reduced Waste: it is a highly efficient process that minimises waste by using only the amount of material needed to create the part. This can result in significant cost savings for manufacturers.
Complex Shapes: it allows for the creation of intricate and complex shapes that would be difficult or impossible to produce using other techniques.
Surface Finish: it produces parts with excellent surface finish quality, making them suitable for applications that require high levels of aesthetic appeal.
Want to know more?
With over 70 years of experience, Precision investment Castings has the expertise and resources to support you with your next project. If you would like more information on how we can help, call us on 0161 925 5160 or send us a message via our contact form.