Fabrication and Thermomechanical Performance Evaluation of an 80-Tonne Uniaxial Hydraulic Hot Press

Abstract

This paper presents the design, fabrication, testing, and performance evaluation of an 80-tonne uniaxial hydraulic hot press, constructed from locally sourced materials with the objective of delivering a cost-effective, multi-functional workshop machine. Conventional hydraulic presses operate under cold working conditions; however, the novelty of this study lies in the simultaneous integration of high compressive pressure and elevated temperature enabling hot pressing operations such as powder sintering, metallurgical compaction, and thermomechanical forming. The machine frame was fabricated from A36 hot-rolled carbon steel C-channels, and all primary structural components were designed to meet established engineering safety and reliability standards. Design calculations were performed using established empirical relationships. Following fabrication, the assembled press was subjected to progressive load testing and thermal performance validation using high-density polyethylene (HDPE) powder. The press demonstrated satisfactory structural rigidity, hydraulic integrity, and thermal functionality throughout all performance evaluations. The total fabrication cost was significantly lower than the equivalent imported machine, demonstrating the economic and technological viability of locally engineered workshop equipment in alignment with United Nations Sustainable Development Goals 1 and 9. This equipment will find wide application in simultaneous high-pressure and high-temperature (hot working) operating conditions.