26-04-2014, 03:50 PM
Snap Fit Design
Snap Fit Design.ppt (Size: 1.45 MB / Downloads: 18)
Introduction
Assembly techniques for Plastic parts are:
Allowing disassembly (Mechanical Fasteners, Plastic Threads, Press-Fittings and Snap-Fits)
Creating a permanent joint i.e. welding
what is snap fit
Snap-fits are the simplest, quickest and most cost effective method of assembling two parts.
Snap fitting provides a simple, inexpensive and rapid means of assembling plastic parts. In such assembly technique basically, a molded undercut on one part engages a mating lip on the other
Design features
Designing a snap-fit is rather complex due to a combination of factors:
Functional requirements of the product.
Assembly requirements.
Mechanical properties of the thermoplastic.
Design of the mold and notably part ejection.
Integrated Snap Fits
No extra part
Simple & reliable
Design freedom
Material Selection
The ultimate success of any design also depends on selecting the material that best fulfills all requirements of a specific application.
the ideal material is thermoplastic because of
high flexibility
relatively high elongation
low coefficient of friction
sufficient strength and rigidity and
its ability to be easily and inexpensively molded into complex geometries.
Thermoplastics are ideal for
integrative designs,
permitting one-piece molding of complex geometries, which consolidates multiple parts into one.