Improving additive manufacturing with thermal cameras
17/01/2019
FLIR Systems has reported how its research-grade thermal imaging cameras are helping researchers better understand the role of temperature in the construction of 3D printed components.Additive manufacturing (AM), also known as 3D printing, is revolutionising manufacturing, because it uses computerised or digital models to generate simple parts and complex components, adding material only where it is needed. A growing number of high-tech organisations around the world are using AM technologies in applications ranging from product development to specialised manufacturing, for uses as diverse as architectural design, aerospace components and medical implants.
Unfortunately, 3D printed parts sometimes suffer from low quality, which is most often due to an unknown cause-and-effect relationship between a manufacturing process parameter, such as a polymer needing to be heated to a specific temperature, and process characteristics, such as part geometry and significant distortion as a result of the cooling rate. All too often, process parameters are set using trial-and-error techniques, which are time-consuming, costly, highly subjective and specific to the machine and/or material.
Thermal cameras are proving their value in advancing a wide range of emerging AM technologies by offering researchers and material scientists the accurate results needed to fine-tune materials, equipment and process parameters, while reducing development time and expenses.
By studying the 3D printing process and its thermal properties with thermal cameras, manufacturers have been able to make quick corrections with minimal production delays.
Research-grade thermal cameras, because of their high thermal sensitivities (down to 0.018°C) and small spatial resolution capabilities (as small as 3.5 µm per pixel), are able to monitor the effect of changes to 3D printer settings and base materials. Also, because they offer non-contact temperature measurements of up to 1,000,000 points in a single thermal image, these thermal cameras are capable of identifying sources of quality problems, including part porosity, delamination, shrinkage, poor surface finish, dimensional or form errors and thermal stresses and distortion. With additive manufacturing expected to continue its rapid growth and adoption in the coming years, the use of thermal cameras will be a key tool in ensuring that processes are optimised to provide uniform, high-quality parts.
www.flir.co.uk
