Vacuum Casting: Technology Overview

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Vacuum Casting: Technology Overview


Vacuum casting, also called urethane casting, is a manufacturing process used to create small quantities of high-quality plastic or metal parts. It involves creating a mould of the desired part and then injecting liquid plastic or metal into the mould under a vacuum. This creates a uniform and detailed part with an excellent surface finish and dimensional accuracy.Get more news about Vacuum Casting Part,you can vist our website!

What is vacuum casting?
Casting is a manufacturing process in which a liquid material is poured into a mould and allowed to solidify. Vacuum casting involves using a vacuum to remove air from the mould, which helps ensure that the object takes on the desired shape.

This process is often used for casting plastics and rubber parts. Vacuum casting is often used for prototype projects or small-scale production runs, as it can be faster and less expensive than other methods, such as injection moulding.

The main advantage of vacuum casting is that it allows for high accuracy and repeatability, making it an ideal choice for applications where precise dimensions are critical. It also allows for more intricate designs to be cast. However, vacuum casting is not suitable for all applications. For example, it cannot be used to cast materials that are sensitive to heat or pressure.
Step 1: Create a 3D model
As with most contemporary manufacturing processes, the first step is to create a 3D model of the desired form. To get the best results, objects intended for vacuum casting should be made following injection moulding principles. Any design software such as AutoCAD, Solidworks, or CATIA can be used for this purpose.

Step 2: Create a master pattern
The 3D model is then used to draft a high quality master model. Previously, CNC machining was used to make them, but now additive manufacturing can do the job quickly. With the advent of 3D printing technology, the pattern maker’s role has become more practical and affordable. On the other hand, a cast model that can serve as the master pattern can be utilised without any further modification.

Step 3: Make the silicone mould
Following the development of the master pattern, a mould is cast. The master pattern, complete with casting cores, inserts, and gates, is hung in a casting box. The formed way is placed in a vacuum casting box, and liquid silicone is poured around it, filling in all the details. This is then put into a preheated oven at 40°C for 8-16 hours to cure. Timing is subject to variation based on the dimensions of the silicone mould.

The box and the risers come out after the silicone has dried and set. To finish, the negative form cavity of the component is exposed by delicately splitting the mould with a knife. Stickiness and surface flaws can be avoided with careful selection and application of the mould-release agent.

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