Home Random Page


CATEGORIES:

BiologyChemistryConstructionCultureEcologyEconomyElectronicsFinanceGeographyHistoryInformaticsLawMathematicsMechanicsMedicineOtherPedagogyPhilosophyPhysicsPolicyPsychologySociologySportTourism






Design for Assembly

http://www.youtube.com/watch?v=D4MnTHrMAtY

 

Table 14.1 lists DFA guidelines, adapted from several sources such as Andreasen, Baldwin, Digital, Huthwaite, Iredale, and Xerox. If a concept is compatible with these guidelines, one can be reasonably assured that the design will fare well in the subsequent more detailed analysis.

 

 

System Guidelines

The first guidelines reduce the number of parts through functional modularity (Figure 14.3) as discussed in Chapter 9. Examine each part, and ask how the part function can instead be completed by a neighboring part. One might also be able to fabricate several parts as one part by using other fabrication processes, such as sheet-metal forming or plastic injection molding (force-flow analysis, Chapter 6).

The second guideline is to reduce the number of parts through assembly modularity as discussed in Chapter 9. Here, several difficult to manipulate parts are bundled together onto a feature such as a board that is easy to manipulate and assemble. Several side benefits are also gained through subsystem modularity. For example, assembly modularity can help reduce defects, as it makes quality problem identification easier when one can test subassemblies rather than having to diagnose the whole product.

The third guideline suggests that one should design a product so that it is assembled outwardly. Do not design a product that requires parts to be fastened on the inside of an enclosure. This makes assembly possible with no reorientations and without having to cram one's hands or tools into tight spaces.

The fourth guideline suggests designing parts so that they are easily oriented. Parts should have self-locating features so that precise alignment by the assembly process is not required. If not that, colored tick marks or indents make orientation easier. This is especially true on electrical components, where one way pin patterns or pin identification labels should be used.

The fifth guideline suggests reducing the variety of parts. In particular, using the same commodity items such as fasteners can avoid errors. It also increases the economies of scale for the part.

 


Date: 2016-03-03; view: 772


<== previous page | next page ==>
II. OVERVIEW AND MOTIVATION | Insertion Guidelines
doclecture.net - lectures - 2014-2024 year. Copyright infringement or personal data (0.007 sec.)