The interplay between the measured dimension and temperature of hot large forgings

Abstract

During the forming process of hot forgings, the dimension and temperature are key parameters for improving the forging technology. In the paper, based on the mathematical physics methods, a mutual relationship model between the measured dimension and the temperature is proposed. This relationship model is displayed by the temperature field model and the dimensional model. Firstly, according to the law of conversation of energy, using the Dirichlet function and the measured dimension, the power-transfer function of heat source is established. Taking the measured temperatures as the boundary conditions, the temperature field model influenced by the dimensional change is established using the method of the moving virtual heat source. Secondly, based on the variation characteristics between the mesoscopic structure and the stress, using the function of the deformation energy is analyzed. Using the differential calculus of the pluralistic function, the dimensional change model influenced by the measured temperature is established. Based on the temperature field model and the dimensional model, this mutual relationship of the two ones can be clearly and directly displayed. Finally, the verifiable experiments and simulations are obtained using the forging experiments and the Deform-3D. Using the contrastive analysis method, the feasibility of the two relationship models is verified and the change trends of the dimension and temperature are analyzed. Combining the parameters of the forging technology in the thermal forming process, the application and the practical significance of the model are further cleared. The mutual relationship model provides a theoretical basis for improving the forging technology.

Simulation of Weld Elbows Hot Forming Process

“…1) is made of steel according to ISO STN 17 322 (Cr-Ni-W-Mo steel). Depend on fact, that in simulation was tool considers as an ideal rigid solid and for simplifying the process of simulation was ignored heat transfer, although the chemical and mechanical properties do not significantly affect the simulation processes [4], [5]. Models of semi products were based on requirements from the industry and were realized in environment of the software Deform 3D (Fig.…”

Exact and inexact scaled models for hot forging

“…Large-scale forged parts remain important for both safety and product capability and for critical and high-temperature applications (Politis et al, 2018, Yang, 2009, Chen and Lin, 2013. Bringing innovation to the hot forging of large scale products is however challenging and consequently the pace of its change is currently moving at a comparatively slower pace when contrasted against other similar manufacturing processes (Hawryluk et al, 2017, Gronostajski et al, 2019, Tian, 2009, Zhang, 2015. The reasons for this are manifold but ultimately it boils down to a size effect; big is more difficult and costly to deal with than small.…”