Meaning
Analytical measurement techniques that utilize electronic sensors bonded to a mold surface monitor real-time steel deformation and strain during the injection cycle. Implementing strain gauge mapping across a complex tool base provides data on localized deflections under clamping and injection forces. This information allows engineers to locate areas of high stress and balance the parting line forces.
Data Acquisition
Microscopic changes in electrical resistance occur when the sensor is stretched or compressed by the flexing steel. During strain gauge mapping, these tiny resistance fluctuations are converted into mechanical strain values by a high-speed data logger. This hardware captures the rapid pressure changes that occur as the cavity fills.
Stress Analysis
Analyzing the captured data helps identify if some regions of the mold base are flexing too much under pressure. When strain gauge mapping reveals excessive movement, it often points to a lack of support pillars behind the cavity plates. This tool flexing leads to parting line breathing and can cause parts to flash or fail dimensional inspection.
Design Verification
Mold designers use the empirical data from the tests to validate their finite element analysis models. This comparison ensures that the actual steel behavior matches the computer predictions before the tool is released for high-volume production.
