High Temperature Hot Press

1. Loading and Preheating Stage: Precise placement of prepregs or preforms into the lower mold cavity, followed by mold closure and application of initial preload. The mold then enters the heating system, where multi-zone temperature control gradually heats the material to the molding temperature range (typically the resin system's curing temperature, e.g., approximately 120°C–180°C for epoxy-based composites). During this stage, the material softens and undergoes viscosity changes, preparing for subsequent pressure-induced flow and permeation.

2. Hot Press Curing Stage: Once the temperature reaches and stabilizes at the set value, high pressure (typically 5–20 MPa) is applied to the mold via a hydraulic or mechanical system. This forces the material to flow fully under high temperature and pressure while expelling internal voids. Simultaneously, temperature, pressure, and time are synergistically controlled according to a preset process curve. This facilitates cross-linking and curing of the resin matrix, achieving full fiber-matrix impregnation and densification. This process effectively prevents defects such as voids and dry spots, ensuring uniformity and consistency in the mechanical properties of the component.

3. Cooling and Demolding Stage: Following pressure-holding curing, the system enters a controlled cooling phase. A circulating cooling medium synchronously cools both the mold and component to the demolding temperature. Pressure is then released, the mold opens, and the formed part is extracted using an ejection mechanism. The final component exhibits uniform fiber distribution, high dimensional accuracy, excellent surface quality, and low residual stress—characteristics that meet the application requirements for high-performance composite parts.