Discover the Creativity of the Future: Use 3D Printing to Bring Your Ideas to Life
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One significant area of additive manufacturing is 3D metal printing. Specifically, components consisting of aluminium, stainless steel, tool steel, Inconel, titanium, copper, and many other metallic materials can be produced quickly and affordably with the use of the SLM technique for laser melting of metal. You can discover what factors to take into account when designing below.
In selective laser melting (SLM), a high-power laser’s thermal energy melts the metallic, powdered starting material at the processing locations. Components are made layer by layer, offering a density of 99.9%, remarkable strength, and the maximum possible retention of the original material’s unique qualities.
SLM 3D printing is known for its exceptional mechanical qualities and distinctive, fine microstructure of the 3D-printed metal workpieces. There are certain rules to adhere to during the design process in order for the parts to be a total success.
If you’re looking for 3D Metal Printing Services Nearby, ensure they adhere to these guidelines to maximize quality and performance.
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Through modified design, the many benefits of selective laser melting in metal production can be completely utilised. Specifically, 3D metal printing services are the sole way to produce intricate internal features, like internal cooling channels, or the combination of assemblies to build a component, which are not achievable with traditional machining techniques like milling or turning.
When it comes to lightweight manufacturing, SLM not only significantly reduces weight but also improves product functioning for applications in the automotive or aerospace industries. Specifically, nature-inspired “organic” architectures allow for entirely new design methodologies. Furthermore, the components are easily adaptable and modifiable at any time, and they may be produced rapidly straight from the CAD model.
One thing must be internalised if you want to take advantage of the additional value that Affordable 3D metal printing creates: Component design cannot be based on traditional, subtractive manufacturing! Instead, the design for additive manufacturing needs to be the main focus!
Avoid converging design, straight corners, and flat overhangs in favour of free-form surfaces or topologically optimised designs. Instead, emphasise divergent design, arcs, and fillets and chamfers. You promote rapid, profitable additive manufacturing from the very beginning of the design process by minimising significant surface changes between layers. Never forget that a smaller area means a smaller volume for the printed body! Your design should be centred on the part’s functionality rather than its manufacturability, which is frequently the case with traditional production.
Designing for 3D metal printing requires careful consideration of component angles. The molten layer sags through the loose powder underneath if the angles built are too flat, at less than 45°, creating downward-facing surfaces. This severely degrades surface quality and causes slag to develop.
Moreover, support structures are necessary for flat angles. Supported surfaces should be avoided whenever possible for high surface qualities because they are always of lower quality for printing purposes. Therefore, to prevent slag development and to use the fewest support structures possible, design your components with sharp angles higher than 45°.
Support structures, sometimes referred to as supports, present a significant challenge to designers when creating printed components. Although support structures reduce the shrink line and stop component deformation during 3D printing, the components’ surface quality deteriorates on the surfaces where support structures are mounted. Finally, because the supports must be removed after printing, support structures invariably result in reworking.
The less support structures you have, the better, to guarantee the overall excellent quality of your components. The material always determines what can be constructed without support structures:
Generally speaking, the following rules should be adhered to in the design if you wish to print as much as possible without support structures:
With a modified design, support structures can often be avoided. Avoid using surfaces in the design that face downward. You can accomplish self-supporting geometry in this way. Always consider where support is required in your design and whether it can be removed after 3D printing. In general, less support structure is required when using free-form structures. You can also improve the quality of the components by using radii and other gentle transitions.
Extremely high melting temperatures, such as 1650°C for titanium and 1200°C for stainless steel, can occasionally be produced via selective laser melting. Fast cooling rates (less than 1 ms for -100°C) combined with material-specific pressures cause the material to undergo changes. Because the underlying layers are heated and cooled again during each printing operation, the tensions build up throughout all printed layers. It is possible to directly reduce the adverse thermal effects in the design:
Remedial intervention is conducted with design measures if thermal strains cannot be prevented. Support structures are frequently utilised to maintain the component’s shape by compensating for thermal stresses. This process, however, leaves the stresses in the component; if the support structure is taken away, the component would warp. While the component is still on the building platform, heat treatment can be used to fix this. The print partner implements this appropriately.
When designing, don’t forget to take the shrinkage lines into consideration. With a few easy design changes, you can prevent unintended component shrinking. View the sketch: Steer clear of the left-hand shape in the image; if it is required, work with curves (centre image) or flip the shape “upside down” for printing (right side image).
The tolerances used in 3D metal printing are different from those used in traditional production. In accordance with ISO 2768, class “M” is designated for potential tolerances in SLM. The tolerances can vary even further, falling between ± 0.4% and even ± 0.3%, depending on the form and contour. Therefore, post-processing, like milling, may be required for extremely precise component sides.
Contact us to learn more about our 3D metal printing services, request a quote, or discuss your next project with our expert team.