An Adaptive Liquid-Filled Stretch Forming Method to Prevent Inverted Burst

Abstract

The invention discloses a self-adaptive charging drawing forming method capable of preventing inverse bulging fracturing, and relates to the field of charging drawing of hydraulic drawing presses. The novel self-adaptive charging drawing forming method capable of preventing inverse bulging fracturing is provided for solving the problem that inverse bulging fracturing is prone to occurring in the charging drawing process. Before sheets are thinned to the maximum extent, inverse bulging thinning of the sheets are controlled by controlling the magnitudes of hydraulic pressure (Fy) of a liquid chamber and tensile force (Fn). When the sum of the hydraulic pressure (Fy) of the liquid chamber and the tensile force (Fn) reaches a set value (F0), the sum of the hydraulic pressure (Fy) of the liquid chamber and the tensile force (Fn) increasing as the tensile depth increases is kept at the set value (F0) by reducing the hydraulic pressure (Fy) of the liquid chamber, so that the change law that the hydraulic pressure of the liquid chamber automatically adapts to the tensile force is achieved. When the inverse bulging height drops to a set value (H0) and inverse bulging disappears, the hydraulic pressure (Fy) of the liquid chamber is increased to a set value F1 until the drawing process is completed.

Description

technical field [0001] The invention relates to a self-adaptive liquid-filled stretching forming method for preventing anti-expansion and rupture, and relates to the field of liquid-filled stretching of a stretching hydraulic machine. It solves the problem that it is difficult to accurately grasp the hydraulic pressure of the liquid chamber in the traditional liquid-filled stretching process, resulting in excessive anti-bulge thinning rate and resulting in anti-bulge cracking, and proposes a new adaptive liquid-filled stretch forming method to prevent anti-bulge cracking. Background technique [0002] In the liquid-filled stretch forming process, a liquid chamber filled with liquid is used to replace the traditional die, and the hydraulic pressure in the liquid chamber is controlled by a hydraulic system. As the punch goes down, the liquid in the liquid chamber is squeezed, resulting in an increase in the hydraulic pressure acting on the sheet. The suspended part of the pla...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem that it is difficult to accurately grasp the hydraulic pressure of the liquid chamber in the traditional liquid-filled stretching process, resulting in anti-expansion and rupture, the present invention provides an adaptive liquid-filled stretching forming method that prevents anti-expansion and rupture

The self-adaptive liquid-filled stretch forming method to prevent anti-bulge and rupture, aiming at the problem that it is difficult to accurately grasp the hydraulic pressure of the liquid chamber in the traditional liquid-filled stretch process, which leads to anti-bulge and rupture, proposes a new self-adaptive liquid-filled stretch to prevent anti-expansion rupture Forming method and corresponding device design