By Robert W. Messler
Critical Mechanical Attachment, highlights on one of many world’s oldest applied sciences and makes it new back. examine buttons and toggles up to date to cutting edge snaps, hooks, and interlocking commercial components. Mechanical fasteners were round so long as mankind, yet brands of past due were re-discovering their speedy, effective and fail facts benefits whilst utilizing them as interlocking person elements compared with such conventional technique of becoming a member of fabrics like welding, soldering, gluing and utilizing nuts bolts, rivets and different related units.
For decades, it's been almost very unlikely to discover a single-source reference that offers an summary of many of the different types of fastening structures and their quite a few purposes. layout engineers should still locate this publication to be a useful resource of designated, illustrated details on how such fasteners paintings, and the way they could retailer money and time. scholars, too, will locate this e-book to be tremendous beneficial for classes in mechanical layout, computer layout, product improvement and different similar parts the place fastening and becoming a member of topics are taught. this may be the 1st reference ebook to return alongside in lots of years that may totally illustrate the most important periods of indispensable mechanical fasteners, replete with examples of ordinary meeting and concepts and proposals for additional research.
* Covers all significant concepts for fundamental mechanical attachment in the context of alternative sorts of becoming a member of together with chemical (adhesive) bonding, melting and solidification (welding, soldering, brazing), and mechanical becoming a member of (fasteners and half features)
* contains particular chapters for specific attachment concerns by way of fabrics kind, together with metals, plastics, ceramics, glass, wooden, and masonry
* offers special assurance of mechanical/electrical connections for trustworthy touch and use
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Extra resources for Integral mechanical attachment : a resurgence of the oldest method of joining
Sample text
Created) after part positioning during the assembly process. 4 shows an alternative taxonomy for integral mechanical attachments based on how features or actual joints are created by interlocking features that occur naturally, are designed and fabricated into detail parts, or are processed into the parts after assembly, including some major sub-divisions. CLASSIFICATION AND CHARACTERIZATION OF INTEGRAL MECHANICAL ATTACHMENTS 37 Integral Mechanical Attachments Naturally-occurring Features or Joints Designed-in Features or Joints Rigid Interlocks Rigid Interlocks Mating shapes (stone) Entangling shapes (wood) Gripping surfaces (stone) Protrusions/recesses Cast (metal/ceramic) Molded (polymer/glass) Forged (metal) Extruded (metal/polymer) Machined (metal) Press fit (metal/polymer*) Shrink fit (metal) Cast or molded-in inserts (metal/ceramic/polymer) Welded-on features (metal/polymer/glass) Elastic Interlocks Elastic Interlocks Entangled shapes (wood) Hook-and-loop (burrs) Snap-fit features Molded (polymer) Machined (metal) Extruded (metal/polymer) Cast or molded-in inserts (polymer/metal/wood) Plastic Interlocks Plastic Interlocks ?
1) must be caused to elastically defect during insertion of one part/feature with its mate. Once the two parts in the mating pair are engaged, an elastic interlock may relax by recovering from the deflected state or may remain deflected and under a residual elastic stress. 2c and d). The load-carrying capability of elastic interlocks, though generally not as great as that for rigid interlocks, can be high, provided failure of the interlocks occurs by fracture versus elastic deflection in the direction opposite that causing part engagement for assembly.
Loosening and/or accidental disassembly does not occur for most methods 2. Some methods reduce stress concentrations vs. fasteners 3. Preventing fluid intrusion or leakage can be very difficult 4. Labor intensity is very low 5. No weight is added 6. Automation is generally easy 7. Up-front costs for molds, dies, etc. may exceed fastening but can easily be amortized by production volume INTRODUCTION TO INTEGRAL MECHANICAL ATTACHMENT 21 First, with a few exceptions, accidental loosening or even disassembly can occur in mechanical joints unless precautions are taken to preclude this.