High pressure source group parallel pressure controlling large panel fluid high pressure forming machine

Abstract

The invention discloses a high pressure source group parallel pressure controlling large panel fluid high pressure forming machine. A die is used for supporting a panel; a drawing system is used for pressing the panel; an edge pressing system is used for pressing a flange region of the panel to prevent wrinkling; a high pressure system is used for controlling the pressure of a liquid filling cavity of the die; a liquid supply system is used for filling the liquid filling cavity of the die with a liquid; a control system can further control actions of a drawing cylinder proportional servo valve, an edge pressing cylinder proportional servo valve and high pressure source proportional servo valves according to the pressure of an edge pressing cylinder piston cavity, the pressure of the liquidfilling cavity, displacement of a piston of the drawing cylinder and displacement of a piston of the high pressure source measured. The fluid pressure can change in real time along with a drawing stroke; in the full course that the pressures of the liquid filling cavity are from zero to the maximum pressure, relatively high pressure control precisions are acquired. The high pressure source groupparallel pressure controlling large panel fluid high pressure forming machine is good in economical efficiency of the high pressure source, small in hydraulic impact, reliable in sealing structure andlong in service life.

Description

Technical field [0001] The invention relates to the technical field of sheet metal forming processing equipment, in particular to a large-scale sheet fluid high-pressure forming machine with parallel pressure control of high-pressure source groups. Background technique [0002] Sheet fluid high pressure forming technology is an advanced manufacturing method of complex thin-walled sheet metal components, which has been widely used in the production process of automobile covering parts, and also used in the forming process of large and complex thin-walled sheets in the aerospace industry. The main process is as follows: first fill the liquid medium of the cavity of the cavity with a liquid medium, place a plate on the upper surface of the cavity, and apply a blank holder force to the blank holder of the forming machine to act on the flange area of ​​the plate through the blank holder. The drawing punch drives the sheet to be drawn into shape, and at the same time, the external high...

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Problems solved by technology

Using the proportional relief valve to control the pressure at the high pressure end of the high pressure source actually controls the hydraulic pressure of the piston chamber at the low pressure end, which can approximately realize the continuous adjustment of the pressure. The first 20% of the range (dead zone) and the last 15% of the range (saturation zone) cannot be continuously adjusted, and the control characteristics are not good

For large-scale plate fluid high-pressure forming machines, due to the large size of the formed plate components, the instantaneous high-pressure liquid displacement during the drawing process is large. If a large-scale high-pressure source + proportional overflow valve is still

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