4. Vau convex
The convex lugs is often used to screw or pin to assemble the parts together.
The thickness of less than 75% of the lug should put the paw thickness, note when the paw thickness exceeding 50% then easily lead to the dimples on the surface because of the stress concentration increases.
the radius of transition beyond 25% of the thickness should put the lug or at least equal to 0.4 mm in order to reduce stress. Once we increase the depth of the lug should make transition radius to reduce the turbulence of the material in the injection molding process and keep stress to a minimum. However, this leads to a result is prone to surface defects opposite.
The outer cone angle on the side should be a minimum of 0.5 ° and taper angle of 0.25 ° smallest so to ensure the drainage site.
To more durable, the convex lug located away from the design of products, additional reinforcement such. The lug should be placed at least 3 mm in order to save materials and reduce cycle time. The distance between the tendon should be equal to at least twice the thickness of the product because if placed too close it will be difficult to cool.
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