By Hwaiyu Geng
This hanbdbook was once comprehensively written. Contained many basic analyses and methodologies that production engineers may have to understand. the writer didn't suppose large arithmetic or business know-hows in getting ready this e-book. i like to recommend it for all production engineers as their own paintings bible.
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Since the mid 1980s to simplify products and reduce assembly costs. 20 Their benchmarking of competitors’ electronic products indicated a best-in-class DFA Index value, as given by Eq. 1), of 50 percent, and they evaluated many different concepts to reach that goal. The final design had 78 percent fewer parts than their previous vehicle adapter and an 87 percent reduction in assembly time. They also measured the assembly defect rates of the new design in production and compared the results to defect rates for the old design.
8 Redesign of a gun sight mechanism. At this point it is worth mentioning that the savings from elimination of items in a simplified design go far beyond the savings from elimination of materials and manufacturing processes. Eliminated parts also remove associated costs for purchasing, inventory, quality control, documentation, production control, and scheduling. Savings in these overhead functions can often outweigh the reduction in direct manufacturing and assembly costs. 19 The numbers in the second column of the table refer to the total number of references to each particular benefit in the 94 cases.
The design team would then know that the value of Young’s modulus will be important. However, the minimum acceptable value of Young’s modulus cannot be determined until the cross-sectional area or wall thickness of the loaded region has been defined. This in turn may depend upon the material cost, acceptable weight, or capabilities of the selected process. One way to proceed with this problem is to utilize derived material properties which more closely match the design requirement. If the part wall is to be subjected to bending movements and low weight is a design requirement, then a defined parameter which represents bending stiffness per weight would be useful for selection purposes.