Abstract: Heat conduction and thermal radiation of workpiece could increase temperature of the steel wire wound frame and the moving beam, which may lead to huge creep deformation, pre-stress loss of steel wire and performance degradation of the hydraulic oil. So it is practically important to analyze the temperature field of the die forging press. Steady and transient temperature field analyses are performed for 400 MN forging press by using ABAQUS to study the temperature field characteristics of the ejection cylinder and steel wires of the moving beam and the frame. The results show that when working temperature of the die is 300 ℃, wire temperature is below 75 ℃ after 48 h, while oil temperature is above 70 ℃ after 8.4 h, the latter exceeds the permit limit. Since the improvement of heat dissipation could not decrease temperature effectively, scheme A in which the heat insulation gaskets are added to the bottom and the top of the cylinder and scheme B in which the insulation gaskets are added between the die and the die holder are proposed. It is verified by the simulation that the latter could decrease oil temperature effectively and meet the design requirements, the oil temperature could keep below 70 ℃ after 48 h. The FEM results agree well with the experimental data, which verifies the validity of the FEM modeling. This work provides beneficial reference for structural design and forging process design.

Key words: die forging press, finite element method(FEM), steel wire wound, temperature field