CAE-predicted warp deformation of rib geometries

As those involved in plastic injection moulding may know, it is actually quite difficult to mould a flat sheet product 'flat'.

This is because it is difficult to achieve the theoretical values for material shrinkage, gate settings, mould temperatures and moulding conditions. Even a flat plate is difficult, but when rib shapes are added, it becomes even more difficult.

For example, CAE can calculate mould temperatures and injection conditions according to theoretical values, but it is still not possible to mould a flat plate completely flat.

The above flat plate will have a slight upward deformation.

So, if you add a rib to one side of this flat plate, how would it change?

Contrary to the previous section, there is a slight downward deformation tendency.

This phenomenon is also known as rib convex deformation.

If we can make good use of this, we can change the deformation tendency by adding a rib shape.

One of the causes of warping is when ribs are concentrated on one side and are unbalanced. In this case, adding ribs on the other side (counter ribs) or reducing the number and thickness of ribs has the effect of reducing deformation.

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