Product Design and Design for Manufacture
Product design and design for manufacture turn concepts into producible goods, integrating user needs with the realities of materials, processes, cost, and assembly.
Definition
Product design and design for manufacture is the practice of developing products from concept to production while ensuring they can be made efficiently, reliably, and economically.
Scope
This topic covers the product development process from identifying needs and generating concepts through embodiment, detailed design, prototyping, and production. Design for manufacture and assembly (DFMA) addresses how design decisions affect manufacturability, part count, cost, and quality, while materials selection links function and form to the properties and processing of materials.
Core questions
- How does a structured development process move a concept to a manufacturable product?
- How do design choices affect manufacturing cost, part count, and assembly?
- How are materials and processes selected to meet functional and aesthetic requirements?
- How are prototyping and testing used to reduce risk before production?
Key theories
- Structured product development process
- Ulrich and Eppinger describe product development as a phased, cross-functional process (planning, concept development, system-level and detail design, testing, and ramp-up) integrating marketing, design, and manufacturing.
- Design for manufacture and assembly
- Boothroyd, Dewhurst, and Knight formalise DFMA as a method for systematically reducing part count and simplifying assembly early in design, demonstrating large cost reductions when manufacturability is considered up front.
History
As products became more complex in the twentieth century, firms formalised product development into managed processes. Design for manufacture and assembly methods, developed by Boothroyd and Dewhurst from the late 1970s, quantified the cost impact of design decisions, while computer-aided design, simulation, and additive manufacturing later transformed prototyping and the link between design and production.
Debates
- Creativity versus manufacturability
- Whether early design should be unconstrained to maximise innovation or disciplined by manufacturing and cost constraints from the outset, as DFMA advocates, to avoid expensive late changes.
Key figures
- Karl T. Ulrich
- Steven D. Eppinger
- Geoffrey Boothroyd
- Peter Dewhurst
- Michael Ashby
Related topics
Seminal works
- ulrich2016
- boothroyd2011
- ashby2014
Frequently asked questions
- What is design for manufacture and assembly (DFMA)?
- DFMA is a methodology for designing products so they are easier and cheaper to manufacture and assemble, chiefly by reducing the number of parts and simplifying assembly operations, with most of these decisions made early in design.
- Why does materials selection matter in product design?
- Material choice determines a product's performance, cost, appearance, manufacturability, and environmental impact. Systematic selection methods, such as Ashby's, match material properties to functional requirements and design objectives.