How is our pressure sensor used in an injection molding machine?
How is our pressure sensor used in an injection molding machine?
The core function of pressure sensors in injection molding machines is to monitor real-time pressure changes during the molding process, ensuring product quality and production efficiency. The first stage of aggregation injection and pressure holding: Sensors are usually installed in the screw head or injection cylinder to detect the injection pressure of molten plastic in real time, preventing mold damage or material decomposition caused by excessive pressure, and avoiding short shots caused by insufficient pressure (incomplete filling). During the holding phase, continuous monitoring of the mold cavity pressure is used to dynamically adjust the holding time and pressure value, compensate for material cooling shrinkage, reduce product shrinkage or deformation, and ensure dimensional accuracy.
The second paragraph focuses on mold protection and system safety: Sensors (such as mold cavities or embedded pressure sensors) monitor the pressure distribution inside the mold cavity to ensure uniform force distribution during mold closure, prevent burrs or local wear of the mold. At the same time, pressure data can optimize process parameters such as injection speed and temperature, reduce defect rates, and for example, abnormal pressure peaks may indicate material flow problems or poor mold exhaust. In addition, sensors monitor the pressure of the hydraulic system in real-time, triggering shutdown protection equipment when it exceeds the limit, and dynamically adjusting the output of the hydraulic pump to reduce energy consumption.
The third paragraph emphasizes the selection and suitability of sensors: Injection molding environments require sensors to have high temperature resistance (20~300 ℃ C) and corrosion resistance (to deal with plastic additives) characteristics, usually using stainless steel shells or special coating designs. Due to the extremely rapid pressure changes during the injection phase, high dynamic sensors with millisecond level response (such as piezoelectric sensors) are required. The installation location covers key nodes such as injection cylinder, mold cavity, hydraulic oil circuit, etc. High end models achieve full process pressure mapping through multi-point sensing, improving control accuracy
The fourth paragraph summarizes the value and maintenance of pressure sensors combined with the "pressure eye" of injection molding machines, ensuring product surface quality, mold life, and energy-saving production through precise closed-loop control. Its reliable components rely on reasonable selection (maximum process, temperature resistance matching) and regular maintenance (cleaning oil stains, calibrating zero drift), consistent with the stability management strategy of force sensors, and are essential core components of intelligent injection molding processes.