The cupping test is a method to test the plastic deformation ability of metal sheets. However, the cupping test will be affected by some subjective or objective factors in the actual test, which will affect the final measured cupping value. The article "Study on the Influence of Pressing Speed on Cupping Value" mainly focuses on the factor of pressing speed, and adopts a new method to study its influence on cupping value.
In this experiment, an international standard mold was installed on a Komatsu servo press, and the experiment was carried out on a 1.50 mm thick ST12 steel plate. In order to obtain the required cupping value Er, the experiment installs sensors on the press, sets the blank holder force and punch speed, and transmits the changes of punch pressure and slider position to the computer connected to the press through the sensor. The input signal is analyzed by programming through the easy-control software, and the pressure change curve of the punch and the displacement curve of the slider are obtained. The position of the slider when the punch just touches the sheet and the position of the slider when the sheet breaks can be obtained by using the punch pressure curve and slider displacement curve obtained from the data sent from the sensor. These two values are subtracted to obtain the experimental cupping value.
in conclusion
Through the comparison of the test data and the observation of the test, it is concluded that the test cupping value measured by installing the standard mold on the Komatsu press is accurate, which is higher than the precision of the traditional testing machine. It is feasible to use this method to determine the cupping value, and as the speed increases, the cupping value of the material decreases continuously.
