The MPM mandrel unit faces several technical challenges, including uneven wall thickness, rolling carding, inner straightness issues, and poor outer diameter quality. These problems significantly affect the overall quality of steel pipes and lead to frequent production defects. To address these issues, it is essential to optimize the parameters of the steel pipe production process, reduce quality-related accidents, and improve product consistency. However, the laws and theories derived from field experiments are often limited in scope and expensive to implement. As a result, using numerical simulation methods to study the seamless steel tube rolling process has become a critical approach.
In this study, key factors such as rolling speed and roll gap were investigated, as they have a significant impact on the quality of the 5-stand MPM rolling product. A relative numerical simulation design method was employed to develop a simulation scheme aimed at analyzing the effects of adjustable parameters like roll gap and rolling speed. Additionally, a finite element model was created using the MARC platform to examine how continuous rolling force and metal stacking influence the rolling process, particularly in terms of rolling force and wall thickness distribution.
Scholars from Nanhua University applied a relative equal-load design method to tackle issues such as low rolling mill efficiency, metal accumulation, cracking, and pull-convex problems caused by mismatches between rolling load and roll speed during the continuous rolling process. A numerical simulation program was developed to analyze how key parameters—such as roll gap and rolling speed—affect rolling force and metal stacking. The findings revealed that increasing the roll gap value when rolling force is excessively high can effectively reduce the force, while adjusting the rolling speed helps manage metal stacking. Field test data confirmed the accuracy of the finite element model, and after optimization, the model was used to simulate and compare rolling forces, further validating its effectiveness.
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