Injection moulded assembly integrity

14 June 2019

Customised engineering example

Plastic injection-moulded subassemblies are often clipped or welded together, and the integrity of the whole must be tested at several points. However, their shape can make them very difficult to hold, whilst still allowing access to the places where you can grip onto to perform a pull test.

Our client needed a complete custom fixturing solution to make tensile testing quick and easy for his operators.

Mecmesin engineers designed profiled nests and retaining plates into which the plastic assemblies were inserted. An X-Y table allowed for precise positioning of the test sample below the force gauge to create an axial pull. Finally, a range of interchangeable hooks were made to pass through apertures and engage the edges in the assembly.

This enabled a defined sequence of pull-off tests to be made consistently across a number of samples for batch testing.

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