12. Design for Assembly

12. Design for Assembly - Design For Assembly Boothroyd and...

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Design For Assembly Boothroyd and Dewhurst Method
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Boothroyd and Dewhurst DFA Method B-D Method is used to estimate Assembly Efficiency of an existing product by providing handling and insertion time estimates for various scenarios Manual handling involves grasping, transportation, and orientation of parts or sub-assemblies before they are inserted into or added to the work fixture or partially built-up assembly. Two Assumptions 1. Parts are presented in bulk and randomly oriented. 2. Parts are added one at a time.
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Handling Difficulties Too small to grasp and manipulate Orientation Require grasping aids Nest Tangle Stick together Slippery Fragile Sharp corners or edge Require two hands for manipulation
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Insertion Difficulties Restricted vision (touch and feel) Hold down required (unstable part, needs alignment before securing) Resistance during insertion (small clearance, jamming, insertion against large force, self-tapping screws) Riveting and screw tightening Welding, soldering, adhesive bonding
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Size is the length of the longest side of the smallest rectangular prism which encloses the
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This note was uploaded on 04/10/2008 for the course MFE 331 taught by Professor Moon during the Spring '08 term at Syracuse.

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12. Design for Assembly - Design For Assembly Boothroyd and...

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