Secondary hardening phenomenon appears in FRP laminated parts

The hardness and dimensions of the product change after several months of storage. This problem is relatively common in lamination molding production and requires comprehensive analysis and solution from multiple aspects of material, process, and equipment.

(1) Process factor: The post-curing process of room-temperature curing systems continues, This factor affects the '2079851475616104453 and final quality of the product. (2) Temperature parameter aspect: Increased ambient temperature accelerates post-curing, which may cause thermal degradation of the material or runaway reaction rate, destroying the internal structure of the product. (3) Material aspect: Fluctuations in raw material performance indicators or insufficient pretreatment affect molding quality. (4) Process aspect: Control deviation of key process parameters causes the '2079851475616104453 to deviate from optimal conditions. (5) Equipment aspect: Equipment precision and maintenance status affect the stable execution of process parameters.

(1) Post-treatment: Perform sufficient post-curing treatment on the product before leaving the factory to stabilize its performance, Develop a reasonable post-treatment temperature profile to eliminate internal stress and stabilize product dimensions. (2) Post-treatment: Consider the amount of change caused by post-curing during design., Develop a reasonable post-treatment temperature profile to eliminate internal stress and stabilize product dimensions. (3) Process optimization: Determine the optimal process parameter window through systematic tests and establish standardized operating procedures. (4) Quality control: Strengthen process monitoring and product inspection, Establish a defect early-warning and traceability mechanism. (5) Preventive measure: Establish sound process control standards and a quality inspection system, and regularly review process data for continuous optimization.

This problem requires comprehensive analysis from multiple dimensions of material, process, equipment, and operation, and should be solved by systematically optimizing process parameters and the quality control system.