{"id":21658,"date":"2022-05-06T12:00:00","date_gmt":"2022-05-06T11:00:00","guid":{"rendered":"https:\/\/www.engineernewsnetwork.com\/blog\/?p=21658"},"modified":"2022-05-06T12:21:00","modified_gmt":"2022-05-06T11:21:00","slug":"optimising-outcomes-with-3d-printing-design-for-additive-manufacturing-part-one","status":"publish","type":"post","link":"https:\/\/www.engineernewsnetwork.com\/blog\/optimising-outcomes-with-3d-printing-design-for-additive-manufacturing-part-one\/","title":{"rendered":"Optimising outcomes with 3D printing \u2013 Design for Additive Manufacturing (part one)"},"content":{"rendered":"\n

In a three-part series of articles, Nick Allen considers the important issue of Design for Additive Manufacturing (DfAM). The series will start by addressing the evolution of product design to provide some context in terms of the state of the design industry when 3D printing first emerged and how both technology sets (digital design and 3D printers) have evolved alongside each other. This will provide a broad historical perspective illustrating how design processes today inform successful uptake of industrial 3D printing for a wide range of applications. Then, parts two and three of this series will go on to explore the intricacies of designing specifically for 3D printing, the advantages it offers over more traditional manufacturing processes and the pitfalls to avoid to achieve the most successful outcomes \u00a0 \u00a0<\/strong><\/p>\n\n\n\n

The history of 3D printing\/additive manufacturing (AM) dates back almost 35 years and as a technology set it proved to be disruptive across many industrial sectors, and continues to evolve and disrupt to this day. <\/p>\n\n\n\n

Back at the beginning, what is now referred to as AM or industrial 3D printing began its journey as a technology universally referred to as \u201crapid prototyping\u201d or RP. This was because it was viewed as a technology that singularly allowed design engineers and manufacturers to easily, quickly and cheaply produce physical prototypes of their new products\/components. <\/p>\n\n\n\n

It is also pertinent to remember that back in the 1980s digital design was also still relatively new. Indeed, it was progress with 3D CAD that went some way to facilitating 3D printing itself. Product development \u2014 including design \u2014 is an iterative process, and getting a product from idea to manufacture involves a great many steps, often in a linear\/circular way. This includes going through numerous iterations of a product to optimise it \u2014 factoring in market research feedback and manufacturability. Designing for the manufacturing process of choice has always been a thing.<\/p>\n\n\n\n

When 3D printing really broke through as a means of rapid prototyping in the 1990s, it offered companies a viable and economically attractive way of producing multiple design iterations to optimise the final product without extending lead times and often shortening them. It is also vital to note that rapid prototyping and 3D printing \u2014 then and now \u2014 are used as umbrella terms for a number of different additive processes<\/a><\/strong>. There are seven additive manufacturing process types in total. <\/p>\n\n\n\n

The very first process was Stereolithography (SLA), a VAT polymerisation process, that used resin materials, which resulted in the first commercial 3D printing system \u2014 the SLA-1 \u2014 from 3D Systems Inc. This was closely followed by two more: the Selective Laser Sintering (SLS) process, originally developed at the University of Texas and commercially licensed by DTM Corp; and the Fused Deposition Modelling (FDM) process developed and commercialised by Stratasys Inc. SLS now falls under the generic process name of Powder Bed Fusion (PBF), while FDM comes under the Material Extrusion process name. The other four additive manufacturing processes that are now firmly established are Material Jetting, Binder Jetting, Directed Energy Deposition, and Sheet Lamination. <\/p>\n\n\n\n

The major advantage that 3D printing offered for rapid prototyping, and the reason it took hold is that it enabled a concurrent or simultaneous engineering approach that eliminated the existing linear\/circular \u2018over-the-wall\u2019 silo culture of product development and drastically reduced design to market times and costs. <\/p>\n\n\n\n

3D printed prototypes<\/strong><\/a> remain a universally accepted and dominant application of the technology set today. <\/p>\n\n\n\n

The thing to note here, though, is that 3D printing offered a way of improving the product development process \u2014 it did not affect the nature or methodology of the design itself. It essentially embedded itself originally as a useful tool for improving the development process (including improving the design through iterative feedback) for existing, traditional manufacturing processes. <\/p>\n\n\n\n

Throughout the 90s, early adopters highlighted progression by including tooling managers in the product development process much earlier \u2014 sometimes just days into the product life-cycle rather than the traditional weeks or months it would usually take. As a result, they could provide valuable input that helped avoid costly mistakes and speed up time-to-market. Further evolution saw tools themselves become a key application of 3D printing \u2014 cue the moniker \u2018rapid Ttooling’. This application area provided a highly cost-efficient way of producing tools for low and medium volumes of products. Again, this is still a viable application of AM technologies today. <\/p>\n\n\n\n

As time moved on \u2014 and really getting traction in the last 10 years or so \u2014 3D printing began to evolve from being a prototyping or tooling technology to a true \u201cproduction\u201d technology, highlighted in the terminology used to describe it today: Additive Manufacturing or industrial 3D printing.<\/p>\n\n\n\n

With this shift, the ability for AM to continue its \u2018disruptive\u2019 role was redoubled, as now the focus was on \u2018if\u2019 and \u2018how\u2019 the various AM processes, together with new and improved materials for AM, could truly replace or complement traditional manufacturing processes. The development of more robust, accurate, speedy, repeatable and cost-efficient machines, especially with the PBF process has reinforced the importance of industrial 3D printing as a true production technology, and today opportunities exist for the intelligent and judicious use of it as a viable and competitive serial production solution.<\/p>\n\n\n\n

However, it was this shift that has also meant that design engineers that are developing products that will be produced with AM \u2014 or considering it \u2014 have had to alter their approach to design. As I mentioned before, designing for the manufacturing process has always been a thing, whether for injection moulding, casting, or CNC machining.  The point here is that for Additive Manufacturing, the design rules are a bit different, in fact, they kind of break the mould!<\/p>\n\n\n\n

In part two of this series, we will look at just how different DfAM is from traditional design for manufacturing approaches, the opportunities this brings in terms of product innovation and functionality, and the ability to optimise products in a way that reduces weight and material usage. <\/p>\n\n\n\n

Nick Allen is MD of 3DPRINTUK<\/a><\/strong>. <\/p>\n","protected":false},"excerpt":{"rendered":"

In a three-part series of articles, Nick Allen considers the important issue of Design for Additive Manufacturing (DfAM). 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