What are the main differences between servo presses and hydraulic presses?
Release time:
2022-08-25
Servo Pressing machine What is the main difference between a servo press and a hydraulic press? Servo presses, also known as electronic presses, differ from hydraulic presses in the following ways:
1. Drive method: Precision CNC electronic presses are driven by servo motors to perform high-precision ball screw pressure assembly operations. The pressure is directly converted from the torque output of the servo motor; ordinary hydraulic presses are driven by motors, and the oil pump changes direction through the directional valve, and then the hydraulic cylinder performs the pressure operation. Its pressure is transmitted through oil pipes and valve bodies, with some loss.
2. Energy saving and environmental protection: Precision CNC electronic presses use servo motors. In standby state, the motor does not rotate, and the speed and power change during pressing. For ordinary hydraulic presses, the motor always rotates in standby, consuming a certain amount of power. During operation, it also rotates at a constant speed, and the power consumption will be higher than this. Compared with servo motors, ordinary motors also have higher noise.
3. Precise control: Precision CNC electronic presses can arbitrarily set multi-level stroke speed, precise displacement stop, precise positioning stop, and precise pressure stop within a certain range. Ordinary hydraulic presses are affected by pipelines, valve bodies, and cylinder sealing, and it is impossible to achieve high-precision control. Many are achieved by mechanical limits. If you want to approach the control accuracy of an electronic press, the equipment cost will be much higher than that of an electronic press, and the control will be more complex.
4. Precision electronic presses have the following functions:
A. Online pressing quality judgment: The full-process curve of pressing force and displacement can be displayed on the LCD touch screen; the full-process control can automatically determine whether the product is qualified at any stage of the operation, and can remove 100% of defective products in real time, realizing online quality management;
B. Pressure, pressing depth, pressing speed, and pressure holding time can be input on the operation panel. The interface is user-friendly and easy to operate;
C. You can customize, store, and call 100 sets of pressing programs: Seven pressing modes can be selected to meet your different process needs;
D. By connecting to a computer through an external port, the pressing data can be stored in the computer to ensure the traceability of product processing data, facilitating production quality control and management;
E. Because the machine itself has precise pressure and displacement control functions, there is no need to add hard limits to the tooling. When processing products of different specifications, you only need to call different pressing programs. Therefore, it is easy to achieve multi-purpose flexible wire assembly with one machine.
The structural characteristics of servo presses include:
1) Small structure, light weight, composite function, and integration.
2) Extend the service life of components and improve system reliability.
3) Reduce hydraulic vibration and noise.
4) Combine electronic technology to improve control capabilities.
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What are the characteristics of a hydraulic press?
CNC hydraulic oil pumps generally use internal gear pumps, while traditional hydraulic presses generally use axial piston pumps. At the same flow rate and pressure, the noise of an internal gear pump is 5 dB to 10 dB lower than that of an axial piston pump. The motor of a CNC hydraulic press runs at rated speed during pressing and return, and its noise emission is 5 dB to 10 dB lower than that of a traditional hydraulic press. When the slider rapidly descends and is stationary, the servo motor speed is 0, so the CNC hydraulic press has essentially no noise emission.
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Application scope and system selection of small hydraulic presses
Suitable applications for small hydraulic presses include: 1. Punching various silicone and plastic buttons for mobile phones or remote controls, and cutting plastic products; 2. Cutting various protective films for mobile phones, digital cameras, and laptop LCD screens, as well as precision cutting and halving of various pressure-sensitive adhesives and trademarks; 3. Embossing, forming, etc., of various PV, PE, PC and other thin-film switches and panels; 4. Pressing and forming various flexible circuit lines for laptop keyboards, etc. Small hydraulic presses use original Taiwanese or Japanese parts for the hydraulic power system, resulting in fewer malfunctions, high efficiency, low noise, low horsepower requirements, easy maintenance, and convenient adjustment of output, speed, and stroke.
2014-04-29
Technology Daily (Reporter Shi Junbin, Correspondent Jiao Yue) Recently, a 19,500-ton free forging hydraulic press and a 300-ton/750-ton-meter full hydraulic forging manipulator, independently developed by China Heavy Industry Corporation, successfully completed their first hot load test run in Jiangyin, Jiangsu Province. This marks the completion of the world's largest tonnage free forging hydraulic press and the world's largest clamping force/clamping torque full hydraulic forging manipulator currently in operation, achieving a globally advanced level of overall equipment installation. The 19,500-ton free forging hydraulic press adopts a three-beam, four-column, three-cylinder, top-drive, press-insert, full pre-stressed frame structure. Both the upper and lower beams use pre-stressed composite beams. The maximum forging capacity can reach 4
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