lecture_12_-_mechanical_assembly_-_chapter_32

lecture_12_-_mechanical_assembly_-_chapter_32 - Mechanical...

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Unformatted text preview: Mechanical Assembly: 1. Threaded Fasteners 2. Rivets and Eyelets 3. Assembly Methods Based on Interference Fits 4. Other Mechanical Fastening Methods 5. Molding Inserts and Integral Fasteners 6. Design for Assembly ME 350 – Lecture 15 – Chapter 32 Two Types of Mechanical Assembly 1. Methods that allow for disassembly – Example: threaded fasteners 2. Methods that create a permanent joint – Example: rivets Why are “rivets” considered “assembly ” if the joint is “permanent”? Shouldn’t rivets be an example of a “joining ” process like welding? Threaded Fasteners What is the difference between a “screw” and a “bolt”? – Bolt: threaded shaft that goes into a (non-affixed) nut ? – Screw: threaded shaft that goes into a threaded hole ? Function: to fasten collars, gears, and pulleys to shafts Setscrews Self-Tapping Screws Function: to form or cut threads into a hole Self tapping bolt? YES! Screw Thread Inserts Internally threaded plugs or wire coils designed to be inserted into an unthreaded hole • Usually assembled into weaker materials to provide strong threads Washer • Simplest form = flat thin ring of sheet metal • Functions: 1. Distribute stresses / provide support 2. Protect part surfaces and/or seal the joint 3. Resist unfastening/ increase spring tension (a) plain washers; (b) spring washers, (c) lock washer Bolt Strength...
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This note was uploaded on 10/03/2011 for the course ME 350 taught by Professor Staff during the Spring '08 term at University of Illinois, Urbana Champaign.

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lecture_12_-_mechanical_assembly_-_chapter_32 - Mechanical...

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