How to eliminate the defects of pressure control of hydraulic equipment
17 Nov 2021
1. Measures to eliminate hydraulic shock of unloading and reversing The high-pressure and large-flow hydraulic circuit will have pressure shocks during unloading or reversing, and cause severe vibration. The basic methods to eliminate such problems are as follows. (1) Pre-release the pressure in the circuit. When people release the pressure energy enclosed in the hydraulic cylinder in a proper way, and then manipulate the main hydraulic system, the pressure shock can be eliminated. There is a two-position two-way solenoid valve in the upper cavity oil circuit of the hydraulic cylinder for pressure relief. When the work is completed and before the main reversing valve changes direction, the pressure relief valve is energized and connected with the help of a time relay for about 3 to 5 seconds. When the loop pressure drops to 0 or close to 0, the main reversing valve is switched on again. There will be no pressure shock. Note that the piping of the pressure relief valve must be small eno...
Features of hydraulic press
12 Nov 2021
As a general non-cutting forming processing equipment, hydraulic press works based on the use of liquid pressure to transfer energy to complete various pressure processing. Its work characteristics: First, the power transmission is "flexible" transmission, which is not as complicated as the power transmission system of machining equipment. This driving principle avoids the situation of machine overload; The second is that there is only a single linear driving force in the stretching process of the hydraulic press, and there is no "angled" driving force, which makes the processing system have a longer life span and a high workpiece yield. The hydraulic press has three basic action modes: single action, double action, and triple action. In the single-action mode, the indenter (or sliding plate) is used as a moving part to move in one direction to complete the pressing process. There is no crimping device in this way of working. Single-action presses are mainly used in the forming of thin...
The history, current situation and development trend of hydraulic press
04 Nov 2021
With the rapid development of China's industry, the shortcomings of domestic forging equipment have become increasingly prominent. Among them, the forging equipment with its own property rights is at a relatively low level, while the forging equipment in developed countries is currently facing a large-scale, high-speed, and modern development. Fast mold, reliable operation, low noise, good protection and high precision. In recent years, CNC systems have been developed, and electronic computers, industrial robots, automatic mold changing systems and automatic warehouses have been developed. Combined, a series of flexible manufacturing cells (FMC) and flexible manufacturing systems (FMS) are formed, and they are connected with the computer integrated manufacturing system (CIMS). In order to occupy as much share as possible on the competitive platform, we urgently need to concentrate on the development of domestic forging equipment. Hydraulic press is one of the most widely used equipment...
History of hydraulic press
27 Oct 2021
As early as 1662, Pascal discovered the possibility of using liquids to generate great power. In 1795, the British Bramah obtained the patent for the first manual hydraulic press, but the development history of the real hydraulic press was less than 200 years. With the development of Western capitalism, the invention of the steam engine triggered a revolution in industrial production, and modern large-scale industry gradually replaced the handicraft industry. The forging process with a long history has gradually changed from manual forging to machine forging. At the beginning of the 16th century, the first hydraulic mechanical hammers appeared. In 1839, the first steam hammer appeared. Since then, with the rapid development of the machinery manufacturing industry, the size of forgings has become larger and larger, and the weight of the forging hammer has exceeded 100t. Such a heavy forging hammer is difficult to operate and has huge vibration, which brings many problems. From 1859 to 1...
Hydraulic oil tank design of hydraulic press
21 Oct 2021
1. Tank top, breather, oil injection port The top structure of the fuel tank depends on the components installed on it. When the pump set is installed on the top of the box, the thickness of the top plate is four times that of the side plate to avoid vibration. Ventilators and oil injection ports are generally provided on the top of the box, and the air vents are often structured with oil injection ports. Remove the breather cap to fill it with oil, and put it back into the breather cap to complete the breather filter. The mesh of the ventilation filter should be less than 250, the flow rate should be greater than 20L/min, the filtration accuracy should not be less than 40, and its capacity should be twice the capacity of the hydraulic pump. The threaded holes on the top of the fuel tank should be blind holes (non-through holes) to prevent pollutants from falling into the fuel tank. The connection details of the tank top and the tank wall are shown in Reference , Figure 7-67. 2. Box...
Overview of hydraulic press
19 Oct 2021
The hydraulic press is a machine that uses liquid as the working medium and is made according to Pascal's principle to transfer energy to realize various processes. Hydraulic presses are generally composed of the machine (host), power system and hydraulic control system. Hydraulic presses (also known as hydraulic presses) are made by Pascal's law and are driven by hydraulic pressure. There are many types of hydraulic presses. Of course, the use is also diverse according to needs. For example, according to the type of liquid that transmits pressure, there are two categories: hydraulic press and hydraulic press. The total pressure generated by the hydraulic press is relatively large, and it is often used for forging and stamping. Forging hydraulic press is divided into die forging hydraulic press and free forging hydraulic press. The die forging hydraulic press uses molds, while the free forging hydraulic press does not use molds. The first 10,000-ton hydraulic press manufactured in Chin...