Additive manufacturing (AM) offers OEMs and their end users some key advantages. Quicker prototyping, reduced wastage and shorter lead times are perhaps the most obvious. However, for control valves in particular, itís the more immediate access to high-performance components with a lower total cost of ownership thatís most significant.
Engineers at IMI Critical Engineering have been exploring the role of 3D-printed valve parts since 2008, but itís really over the last five years that the technology has gathered pace. Itís an important part of ensuring our customersí planned outages and routine servicing run to schedule, as well as the driving force behind Retrofit3D, IMI Critical Engineeringís valve trim upgrade service.
AM is now found in IMI Critical Engineering facilities across the world, such as Paju City in South Korea, where the team has recently installed the SLM280, a high-precision 3D printer thatís capable of producing medium- to high-volume metal AM parts.
We caught up with engineers Axel Urbain and MjungJae Lee to find out more about the project, how itís transforming IMI Critical Engineeringís approach to valve design and manufacturing in the region, and what the future holds for this exciting technology.
Why did the team choose the SLM280?
The Korea team had already collaborated on an earlier project with Fusion Technology, a local 3D printing vendor that represents SLM Solutions. We knew the vendor had sufficient experience with AM production and was able to provide full support as we integrated the printer into our facility. As for the printer itself, itís ideal for metal part production and prototyping, with multiple lasers and closed-loop powder handling.
How long did it take to install the SLM280?
We decided to purchase the new printer in June 2022 and planning started immediately. It took six months from sign off to commissioning, training and qualification. We devoted almost two months to the latter stages as we wanted colleagues to familiarise themselves with the machine before using it for customer orders. Production of parts for live projects commenced in February 2023.
Explain more about the commissioning and validation process. How does IMI Critical Engineering guarantee quality valve parts?
Commissioning was conducted according to SLMís system testing and qualification. Following this, we continued with our own internal qualification according to the AM procedure set out by the Retrofit3D team in the USA, who have extensive experience with 3D-printed parts. The validation process included mechanical and flow capacity testing using a 3D-printed DRAGģ disk stack.
Although process parameters were fine-tuned to reach the highest quality for IMI products, we were able to identify issues and resolve them by adjusting the parameters. These test-and-learn processes became the base of the current AM production standard.
What can be made with the SLM280?
This printer is incredibly versatile because it has a significantly larger build plate when compared to competing designs. It also has multiple lasers. These features allow us to manufacture parts much quicker than before without sacrificing part quality or integrity.
In theory, the printer can produce virtually any object within certain dimensions, though we currently use it to produce disk stacks and seat baskets featuring our patented DRAGģ technology. However, this technology can be used to make a range of multi-stage flow control devices, including valve cages or disk stacks, flow distributors or diffusers, and multi-stage high-turndown control ball valves.
What benefits does this new machine offer IMI Critical Engineering and its customers?
Conventional subtractive manufacturing creates a lot of material waste. Disk stacks, for instance, will be machined from raw sheet metal, with the offcut material often unsalvageable. AM, on the other hand, only uses whatís needed to complete the object thatís being printed, making it a far more efficient and sustainable method of manufacturing.
Our customers benefit from the shorter lead times, lower costs and a more agile response from their valve supplier. As parts can effectively be printed on demand, plant owners can also avoid the inconvenience and expense of having to stock extra inventory on site.
What do you see as the next steps for metal AM?
This technology is developing rapidly, but there are still challenges to negotiate before entire AM valves are introduced Ė not least those destined for use in severe service applications. More field testing is key, as is customer consultation with expert suppliers. Itís an exciting area of research and one which IMI Critical Engineering is leading with major investments such as the SLM280.