An energy-saving four-cylinder indirect thermoforming hydraulic press control system

Abstract

The invention discloses an energy-saving four-cylinder indirect thermoforming hydraulic press control system. In the present invention, a plurality of pump direct drive state pressure control units are respectively connected with a plurality of multi-pump confluence control units. It is connected with the process main oil circuit and the return main oil circuit. The process main oil circuit is connected with the upper end of the hydraulic press after passing through the suppression level control unit and the four-column pressing oil cylinder unit. The four-column pressing oil cylinder unit is fixedly connected with the upper end of the hydraulic press. The return main oil circuit After going through the return control unit and the overflow valve parallel control unit in turn, it communicates with the lower end of the hydraulic press. The hydraulic press controlled by the invention has faster mold clamping speed and longer pressure holding time, reduces the heat loss of air cooling, and at the same time ensures that the workpiece has sufficient mold clamping force to offset the sharply increased internal pressure during the mold clamping and quenching stage; realizes pressure and Speed ​​dynamic classification, more precise control of pressing speed and pressure.

Description

technical field [0001] The invention relates to a hydraulic press control system in the field of thermoforming hydraulic press control systems, in particular to an energy-saving four-cylinder indirect thermoforming hydraulic press control system. Background technique [0002] The widespread use of high-strength steel plates is currently the most common and most feasible way to achieve lightweight automobiles. Indirect thermoforming is a newly developed forming process for auto parts. The indirect thermoforming process is limited by the size and shape of the parts. All parts produced by the ordinary cold stamping process and the direct thermoforming process can be produced by the indirect thermoforming process; there is no deformation process of the workpiece in the core quenching process, and the mold stress distribution is uniform. There is almost no relative movement between the workpiece and the surface of the mold, so that the mold loss is small and the surface of the wo...

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Problems solved by technology

[0003] However, the indirect thermoforming process that is currently put into production has some disadvantages: the mold closing speed is slow, the air-cooled heat loss of the workpiece is large, which affects the precise control of the thermoforming temperature, and the requirements for the quenching cooling system are high, which may easily lead to low quenching quality. ;The pressing stroke is longer, and the pressure gradient process is relatively slow, resulting in a sharp increase in the internal stress of the workpiece, which affects the tensile quality of the workpiece; high energy consumption and high noise

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