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What is injection molding?
What is injection molding?
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What is injection molding?

    Precision injection molding of high performance components requires primary error

sources affected the molded component to be identified and isolated such that these errors can be reduced if needed. To

systematically isolate and quantify the contribution of misalignment, thermal variation and component warpage to the

accumulated error observed on the component, a methodology is presented and tested around an existing mold which produced

parts with high dimensional variability. The mold featured two concentric guide pillars on opposite sides of the parting

plane and rectangular centering block elements at three locations. Mold displacements at the parting plane were measured

through the incorporation of three eddy-current linear displacement sensors. Thermal error sensitivity was investigated using

FEM simulations such that the induced variability from thermal expansion and filling phase was identified and quantified.

Finally, molded component warpage was isolated and quantified, again by the means of FEM simulation. The results were

confirmed by using the mold on two injection molding machines to produce an array of parts whose key dimensions were


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