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Based on the assembly structure of twin-roll rotary forging machine with load of 5000 kN, according to the load law of twin-roll rotary forging transmission parts, the working condition of roll shaft for twin-roll rotary forging machine was studied. Through the construction of finite element model for relevant components, the stiffness and strength of roll shaft were analyzed by software Hypermesh, and the structure of roll shaft connection was optimized according to the analysis results. Then, the roll shafts with optimized structure were assembled, and the twin-roll rotary forging after assembly was debugged. Furthermore, through several on-site tests, the results show that the twin-roll rotary forging machine runs stably without bad vibration, the stiffness and strength of roll shaft meet the requirements, and the processed parts also meet the quality requirements. Thus, the rationality, stability and reliability of the roll shaft design were verified. And the research results provide guidance for the development of twin-roll rotary forging machine with higher stiffness and strength and better safety performance.
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