Study on the Pretightening Assembly Moving Beam of Open-Die Forging Hydraulic Press

Abstract

The FE model of the pretightening assembly moving beam of open-die forging hydraulic press is built with FE simulation software ABAQUS in the study. With the FE model, the force status of pretightening assembly moving beam is studied. Then the pretightening force of assembly moving beam is further studied and the computing method of pretightening force is given. The main achievements of the study include: Under pretightening, the stress of main moving beam is very low and that of guild sleeves is also lower than the allowable stress. Under center loading, the stress of the center field of main moving beam is higher and that of guild sleeves is almost same to that of pretightening. Under eccentric loading, the stress of same deviation field of main moving beam is higher and the effect of pretightening force on the stress of main moving beam is very small. The stress distribution of guild sleeves with different pretightening force is same and the effect of pretightening force on its strength is very low. The pretightening force of tension rod can be computed with the force of press, the allowable eccentric value of the workpiece, the distance between up guild section and down guild section of guild sleeve and the quantity of tension rods. The results of the study are very useful to design and install the pretightening assembly moving beam of open-die forging hydraulic press.

Research on a double frame hydraulic press with PTS using winding steel wires

“…The calculation from Eqs. ( 6) and (7) shows that the magnitude of the pressure applied to the upper and lower semicircular beams after wrapping 𝑛 steps is shown in Table 3.…”

“…It has become an important indicator of a country's manufacturing level and industrial development capability [1][2][3][4][5]. Compared with traditional large hydraulic presses with fourcolumns, prestressed wire-winding hydraulic presses have the advantages of high fatigue strength, high load-bearing capacity, and no abrupt failure, therefore, prestressed wire-hydraulic presses using winding steel wires have been used in more and more industrial fields [6][7][8][9][10]. At present, the design of prestressed WSW hydraulic presses is still based on the traditional mechanical equations and theoretical model calculations to determine the structural size parameters and winding process of the hydraulic presses, while there are certain structural differences between the actual produced hydraulic presses and the theoretical model, which leads to the deviation of the calculated results from the actual values.…”