In the large-scale design of the cubic (six-sided anvil) press, the following key measures were primarily adopted to improve the equipment's centering, synchronization, and pressure-keeping performance:

1. Structural and Component Design Improvements
A. Adoption of the Pocket Bottom Structure: The design scheme for the main structure of the heavy-tonnage cubic diamond press utilized the pocket bottom structure  for the hinge beams and working cylinders. Physical testing has shown that the pocket bottom structure provides better structural rigidity compared to the flange support structure.
B. Live-Bottom Working Cylinder Design and Wall Thinning: The working cylinder was designed to be the live-bottom type. While meeting mechanical processing requirements, efforts were made to minimize the wall thickness of the working cylinder barrel and reduce the cooperation clearance between the outer diameter of the barrel and the inner bore of the hinge beam. These measures not only improved the press's centering ability but also resulted in the barrel conforming to the inner wall of the hinge beam after being subjected to ultra-high hydraulic pressure, improving the stress conditions.
C. Shortening of Key Component Lengths: The design shortened the length of the working cylinder and hinge beam. This reduced steel consumption and manufacturing costs while ensuring the strength of the parts.
D. Optimization of Hinge Beam Lug Shape: The shape of the hinge beam lugs was rationally designed. By keeping the extension surfaces of adjacent lugs parallel and ensuring that the traditional hinge beam lugs project appropriately higher than the outer diameter of the barrel, the strength of the dangerous bottom cross-section was effectively increased, and the equipment's rigidity was enhanced.
E. Piston Center of Gravity Shift for Synchronization: To minimize the downward deflection of the 6 horizontal anvils when advancing, the design required the piston's center of gravity to be shifted backward to eliminate horizontal piston deflection caused by weight. Maintaining high machining and positioning accuracy for the hinge beams, working cylinders, pistons, and guide sleeves is also crucial for improving synchronization.

2、Connection and Friction Resolution
A. Use of Elastic Gap-Free Pin Connection: Elastic gap-free pin connections were used between the hinge beams. While traditional rigid cylindrical pins typically have clearance for easy assembly, which affects the press's centering, the elastic gap-free pins eliminate the clearance between the hinge beams, forming an interference fit, thereby significantly improving the equipment's centering, synchronization, and pressure-keeping performance. Eliminating clearance also helps enhance the coordination of the equipment's inherent deformation.

B. Installation of Bronze Wear Strips on Pistons: Bronze wear strips were installed on the pistons. This reduced the fit clearance between the piston and the working cylinder to 0.01 mm, which greatly improved the press's centering. Furthermore, this measure completely solved the troublesome "scoring" (cylinder scratching) problem during press use, preventing synchronization issues or component scrapping caused by scoring.