The Boothroyd Dewhurst concept of DFMA allows a team to examine design alternatives and simplify the structure of the product before detail design has. Design for assembly (DFA) is a process by which products are designed with ease of assembly Starting in , Geoffrey Boothroyd and Peter Dewhurst developed a computerized version of the DFA method which allowed its. This chapter explains how the Boothroyd-Dewhurst (B&D) Design for Manufacture and Assembly (DFMA) works, discusses the experience and benefits of using.
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Design for assembly DFA is a process by which products are designed with ease of assembly in mind. If a product contains fewer parts it will take less time to assemble, thereby reducing assembly costs. In addition, if the parts are provided with features which make it easier to grasp, move, orient and insert them, this will also reduce assembly time and assembly costs.
The reduction of the number of parts in an assembly has the added benefit of generally reducing the total cost of parts in the assembly. This is usually where the major cost benefits of the application of design for assembly occur.
Design for assembly can take different forms. In the s and s various rules and recommendations were proposed in order to help designers consider assembly problems during the design process. Many of these rules and recommendations were presented together with practical examples bothroyd how assembly difficulty could be improved. However, it was not until the s that numerical evaluation methods were developed to allow design for assembly studies to be carried voothroyd on existing and proposed designs.
The method was originally developed in order to rate assemblies for ease of automatic assembly.
Design for assembly
Starting inGeoff Boothroyd, supported by an NSF grant at the University of Massachusetts Amherstdeveloped the Design for Assembly method DFAwhich could be used to estimate the time for manual assembly of a product and the cost of assembling the product on an automatic assembly machine.
These criteria, together with tables relating assembly time to various design factors influencing part grasping, orientation and insertion, could be used to estimate total assembly time and to rate the quality of a product design from an assembly viewpoint. For automatic assembly, tables of factors could be used to estimate the cost of automatic feeding and orienting and automatic insertion of the parts on an assembly machine.
All methods are now referred to as design for assembly methods. Most products are assembled manually and the original DFA method for manual assembly is the most widely used method and has had the greatest industrial impact throughout the world. The DFA method, like the AEM method, was originally made available in the form of a handbook where the user would enter data on worksheets to obtain a rating for the ease of assembly of a product.
Starting inGeoffrey Boothroyd and Peter Dewhurst developed a computerized version of the DFA method which allowed its implementation in a broad range of companies. For this work they were presented with many awards including the National Medal of Technology.
There are many published examples of significant savings obtained through the application of Dewnurst.
For example, inSidney Dewhursg, manager of manufacturing engineering for Xeroxestimated that his company would save hundreds of millions of dollars through the application of DFA. There are many key principles in design for assembly     .
Two notable examples of good design for assembly are the Sony Walkman and the Swatch watch. Both were designed for fully automated assembly. The Walkman line was designed for “vertical assembly”, in which parts are inserted in straight-down moves only. The Sony SMART assembly system, used to assemble Walkman-type products, is a robotic system for assembling small devices designed for vertical assembly.
These DFAA rules help design a product that can be assembled automatically by robots, but they are useful even with products assembled by manual assembly.
For more information on Design for Assembly and the subject of Design for Manufacture and Assembly see:. From Wikipedia, the free encyclopedia. Boothroyd, Marcell Dekker, Inc. Dewhurst, Boothroyd Dewhurst, Inc.
The Methodology Applied G. Engineering Systems Research Center.
DFMA® – Cutting Billions in Manufacturing Costs Since | Boothroyd Dewhurst, Inc.
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