The history and development status of hydraulic presses(2)

In 1957-1958, China began designing and manufacturing the first 25,000kN medium-sized forging hydraulic presses. This equipment has been working in the heavy machinery factory in Beijing for decades. in the early 1960s, in Shanghai and northeast China, the 120MN class Taiko hydraulic presses were built, which is an important mark and an important event in the history of hydraulic press development in China. The national spirit of self-reliance and hard work of the Chinese people was reflected.

At the end of 1960s, China established a set of large hydraulic presses with high technical requirements, including 300MN non-ferrous metal die-forging hydraulic presses, 120Mn non-ferrous metal extrusion hydraulic presses, 80Mn ferrous metal die-forging hydraulic presses, etc.

After 1970s, China started to export various tonnage of forging hydraulic presses to foreign countries, one of which is 60MN forging hydraulic presses. So far, China has not only established its own hydraulic press design and manufacturing industry, but also reached a fairly high level. since the 1980s, with the reform and opening up of China and the rapid development of the national economy, the design and manufacturing level of hydraulic presses has also been greatly developed.

At present, the development trend of various hydraulic presses is as follows: 1. With the development of proportional servo technology, the accuracy of the hydraulic press stop position and speed control accuracy is getting higher and higher, and closed-loop PLC control (variable pump or valve) by displacement grating for proportional servo control is used in high-precision hydraulic presses.

The integration and accuracy of the hydraulic system is rarely used, and the use of general-purpose slide valves is correspondingly reduced, and plug-in valves are widely used. The invention integrates plug valves on one or more valve blocks according to the requirements of different circuits, greatly reducing the connecting pipeline between valves, reducing the loss of fluid pressure in the pipeline, reducing shock vibration, and widely using a dual system for direct control and operation of each part of the equipment as a host computer and programmable controller (PLC).

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