tie-bar strain measurement

Part of the closing force control for securing the die closing and the parallelism of the mold halfs.

The thermal impact of die and melt and the resulting change of compressive and tensile stress affect on the size accuracy of the tie bars. The parallelism of the tooling plates is crucial for an uniform strain in the tie bars under the closing force.

Non-parallel mold half’s lead to inconsistent loads in the tie bars, which may lead to damage or even failure. Particularly high closing forces should be under control of the tie-bar strain measurement. Also when the die is changed an inspection of the parallelism through the tie-bar strain is appropriate. Strain sensors perform the measurement and can be linked to the data acquisition. Therefor the tie-bar strain can be used to evaluate deviations in the production process.