塑料卡扣汇总

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塑料卡扣汇总An economical and quick method of joining plastic parts is by a snap-fit joint. A snap-fit joint can be designed
so it is easily separated or so that it is inseparable， without breaking one of its components. The strength of the
snap-fit joint depends on the material used， its geometry and the forces acting on the joint.
Most all snap-fit joint designs share the common design features of a protruding ledge and a snap foot.
Whether the snap joint is a cantilever or a cylindrical fit， they both function similarly.
When snap-fit joints are being designed， it is important to know the mechanical stresses to be applied to the
snap beams after assembly， the required mechanical stresses or strains on the snap beams during assembly，
the number of times the snap joint will be engaged and disengaged， and the mechanical limits of the material(s)
to be used in the design.
Reasons to Use Snap-Fits:
· Reduces assembly costs.
· Are typically designed for ease of assembly and are often easily automated.
· Replaces screws， nuts， and washers.
· Are molded as an integral component of the plastic part.
· No welding or adhesives are required.
· They can be engaged and disengaged.
Things To Be Aware of When Using Snap-Fits:
· Some designs require higher tooling cost.
· They are susceptible to breakage due to mishandling and abuse prior to assembly.
· Snap-fitsthat are assembled under stress will creep.
· It is difficult to design snap-fits with hermetic seals. If the beam and/or ledge relaxes， it could decrease