During the stamping forming process of the hydraulic press machine, the resistance generated by the deformation of the sheet material gradually increases, and the working pressure of the hydraulic press machine also gradually increases. Multi-cylinder drive is used to perform dynamic classification of working pressure. The oil output by the pump is supplied to different cylinder combinations. Different tonnage and working speed classifications can be obtained without increasing the installed power. This is the core of tonnage conversion technology.
When the hydraulic press machine is converting tonnage, the switching of different tonnages can be controlled by feedback to the electronic control system through the position detection of the slider. Generally, a displacement sensor can be used to set different stroke positions and use different pressing tonnages. As a rough setting, the conversion of three tonnages can be evenly taken as 1/3 of the project. If fine settings are required, the settings can be made in conjunction with the pressure stroke curve of the workpiece, which is more accurate.

                                                              

Tonnage Conversion Technology of Hydraulic PressMachine
By turning the solenoid valve on and off, the number of power cylinders can be controlled to achieve tonnage conversion, thereby increasing the pressing speed of the hydraulic press slider. In this plan, only two sets of tonnage conversion valve groups, corresponding oil pipe connections and a small number of electrical components are added to realize the conversion of three tonnages. The manufacturing cost of the whole machine is increased very little, but the working speed of the stamping stage of the hydraulic press is It can be increased by 1.5~2.5 times, and the power improvement is particularly obvious in the deep drawing process. This principle can also be used for various tonnage conversion combinations of four cylinders, five cylinders or even more cylinders.
This technology can greatly improve the working efficiency of hydraulic press machines and increase user output. However, for hydraulic press manufacturers, the increase in manufacturing costs of hydraulic presses is very small. It can be achieved by simply adding one or more sets of tonnage conversion valve groups, which is very practical. The most commonly used tonnage conversion technology is a three-cylinder combination that uses two piston cylinders and one plunger cylinder. It can also use four-cylinder, five-cylinder and other combinations. 
Delishi offers hydraulic presses in a variety of bed sizes and tonnages with servo-electric or hydraulic actuation. Increase your production efficiency and process repeatability with servo! If you need hydraulic press machine, please contact us, then whole hydraulic press solution will be provided for you.