Abstract: Balancing system of the gliding block is key component to the large die forging hydraulic press, which provides the rectification moment on the eccentric load working condition to ensure the position precision of the gliding block and the product quality. During the working process of the hydraulic press, the eccentric moment is unknown, then how to determine the required rectification moment through the measured displacement differences of the 4 corners of the gliding block becomes a key technical and theoretical puzzle. Therefore, the concept and operating principle of the moment leveling and position control balancing system has been put forward, that is, arrange four pairs of balance cylinders in four corners of the gliding block, and monitor the four corners displacement by high-precision displacement sensor in real-time, to increase or reduce the hydraulic pressure of corresponding pair of cylinders. the parameterized mechanical model of the gliding block has been constructed, and the analytic functions between the displacement differences of the four corners of the gliding block and the required rectification force have been theoretically deduced, the corresponding curves have also been drawn, which can provide theoretical reference not only for the rectification force control during the actual working process, but also for the design work of same type of hydraulic balancing systems.

Key words: Balancing force, Balancing system, Die forging, Hydraulic press