Large group injection molding enterprises often have multiple independent production workshops, with hundreds of hot runner molds scattered in different production lines, and thousands of thermocouple spare parts stored in various workshop warehouses. Traditional decentralized manual management leads to frequent problems such as mixed storage of K/J types, expired uncalibrated probes, unclear matching mold serial numbers, blind repeated procurement and delayed maintenance replacement. Establishing a unified digital thermocouple full-life centralized management system can realize cross-workshop inventory sharing, automatic calibration reminder, mold matching traceability and cost statistical analysis, greatly reducing auxiliary material management labor costs and mold downtime losses caused by sensor mismatch.
The first core module is unified spare part coding and centralized warehouse storage management. All thermocouple products from suppliers are laser engraved with unique global unified QR code serial numbers, which record core attribute information including thermocouple type, sheath diameter, wire length, temperature grade, sheath material, factory calibration date, precision grade and service life limit. The group sets up a central general spare parts warehouse, and all new incoming thermocouples are scanned and entered into the MES system to build a unified inventory database, while each workshop only sets up a small turnover spare parts cabinet with limited stock. When a certain workshop lacks a specific model of probe, the system can automatically query the inventory surplus of other workshops, realize cross-workshop allocation and transfer, avoid repeated blind procurement and reduce group-wide spare part capital occupation. The system sets safety inventory thresholds for each specification model; when the quantity is lower than the warning value, it automatically generates procurement application orders and pushes them to the purchasing department, eliminating the risk of production shutdown due to insufficient spare parts.
The second module is mold binding and cross-workshop mold transfer traceability function. When installing thermocouples on any hot runner mold, the maintenance staff scans the probe QR code and the mold unique identification code at the same time to complete one-to-one binding recording, marking the installation date, production resin type and daily production shift intensity. When the mold is transferred from Workshop A to Workshop B for production, the system synchronously transfers all bound thermocouple data to the receiving workshop's terminal, including the last calibration date, remaining recommended service life and historical fault records. Maintenance personnel in the new workshop can view all maintenance records of the mold's thermocouples through the mold QR code, arrange cleaning and calibration plans in advance, and avoid blindly replacing intact probes due to unknown historical use data. All disassembly, replacement and transfer records of each probe are permanently stored in the cloud database to realize full-process traceability from factory delivery to scrap.
The third module is automatic timing reminder of calibration and replacement cycle. The system sets differentiated cycle parameters according to the use intensity of thermocouples bound to each mold: 24-hour continuous production automotive and glass fiber reinforced plastic molds trigger calibration reminders every two months and full replacement reminders every four months; 8-hour single-shift packaging mold probes remind calibration every three months and replacement every six months; intermittent trial production mold probes extend the cycle to half a year for calibration and one year for replacement. Seven days before the maintenance deadline, the system pushes reminder messages to the mobile phones of the process supervisors and maintenance foremen of the corresponding workshop, and automatically generates standardized maintenance work orders, including the probe serial number, corresponding mold number, required maintenance items and completion time limit. After the maintenance operation is completed, the staff scans the code to upload calibration deviation data and cleaning records, and the system refreshes the next maintenance time node in real time, eliminating the omission of manual recording and missed calibration.
The fourth module is group-wide multi-dimensional cost statistical analysis. The system automatically collects all procurement expenses, maintenance labor costs, mold shutdown loss costs and defective product waste losses caused by thermocouple faults of each workshop, each production line and each mold model, and generates visual monthly and quarterly cost reports. Managers can compare the comprehensive use cost of imported original thermocouples, high-end domestic calibrated probes and entry-level low-cost probes under the same production conditions, adjust the group's unified spare part procurement standard in a targeted manner, and formulate differentiated matching standards for high-precision molds and low-profit mass production molds. The system can also count the fault frequency of each specification thermocouple model; if a certain batch of probes has concentrated drift and fracture faults within a short service life, the purchasing department can quickly trace the supplier batch and launch quality claim processing.
The fifth module is scrap unified recycling and elimination management. When the thermocouple reaches the service life or is judged severely drifted and scrapped after calibration, the maintenance staff scans the code to mark the scrap state in the system, and uniformly transports the waste probes to the central warehouse for classified metal recycling. The system records the scrap reason, service life length and cumulative production cycle data of each waste probe, accumulates big data to analyze the quality gap of different brands and specifications, and provides data support for subsequent supplier screening and product model optimization. Scrapped probes marked in the system will be locked in the inventory database, and the system will pop up a warning if the staff mistakenly takes out and installs them again, completely avoiding the reuse of invalid drifted sensors.
For multi-workshop group enterprises, the unified centralized thermocouple management system breaks the information isolation of decentralized workshop inventory, realizes refined full-life cycle control of all sensing components, reduces the group's overall spare part capital occupation by more than 35%, and cuts unplanned mold shutdown losses caused by mismatched and expired thermocouples by over 70%.
