Multistage unloading loop control system for large-tonnage full-automatic hydraulic fine blanking press

Abstract

The invention discloses a multistage unloading loop control system for a large-tonnage full-automatic hydraulic fine blanking press. The multistage unloading loop control system comprises a master cylinder unloading oil port, a first cartridge valve, a second cartridge valve, a third cartridge valve, and a hydraulic control one-way valve, wherein the master cylinder unloading oil port is divided into three routes; the first route is connected with a control port of a pilot operated directional control valve; the second route is respectively connected with oil inlets of the first cartridge valve and the second cartridge valve; the third route is connected with an oil inlet of the third cartridge valve; the pilot operated directional control valve serves as a two-position four-way reversing valve; a port P of the pilot operated directional control valve is both connected with an oil outlet of the first cartridge valve and a control port of the third cartridge valve; a port B of the pilot operated directional control valve is connected with a control port of the first cartridge valve. The multistage unloading loop control system disclosed by the invention utilizes the cartridge valves with different drift diameters to implement the situations that the flow is changed from small to large and slow to fast when the unloading process is started, and when the unloading process is finished, the flow is changed from large to small and fast to slow, so that the whole unloading process is relatively stable, the system has a better linear relation, and the unloading process is safe and reliable.

Description

technical field [0001] The invention relates to a multi-stage unloading circuit control system for a large tonnage fully automatic hydraulic fine blanking machine. Background technique [0002] Fine blanking technology is a hybrid advanced metal forming process combining stamping and cold extrusion methods, which can obtain high-quality parts in one stamping process. Compared with the traditional cutting processing method, the fine blanking process for processing the same special-shaped parts can directly punch out products with minimal size and shape errors, high precision, smooth shear surface and good consistency with metal plates. , and the material consumption can be saved by 30-50%, and the production efficiency can be increased by 5-20 times or even higher. With the continuous and successful development of metal sheets suitable for fine blanking in recent years, there are more and more varieties of fine blanking parts, and the thickness of materials is increasing. T...

AI Technical Summary

Problems solved by technology

[0003] The single-stage unloading circuit of the traditional hydraulic system adopts the way that the reversing valve directly returns to the oil tank, which has problems such as slow unloading speed, or large impact during unloading, and unstable work.

Images