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普通液压机与伺服液压机的对比区别不同

普通液压机与伺服液压机的对比区别不同

作者:admin    来源:未知    发布时间:2020-06-26 23:40    浏览量:

普通液压机它的原理是利用帕斯卡定律制成的利用液体压强传动的机械,种类很多。当然,用途也根据需要是多种多样的。液压机除用于锻压成形外,也可用于矫正、压装、打包、压块和压板等。

普通液压机基本原理是油泵把液压油输送到集成插装阀块,通过各个单向阀和溢流阀把液压油分配到油缸的上腔或者下腔,在高压油的作用下,使油缸进行运动.液压机是 利用液体来传递压力的设备。液体在密闭的容器中传递压力时是遵循帕斯卡定律。四柱液压机的液压传动系统由动力机构、控制机构、执行机构、辅助机构和工作介质组成。动力机构通常采用油泵作为动力机构,一般为积式油泵。为了满足执行机构运动速度的要求, 选用一个油泵或多个油泵。

 

液压机的伺服电机驱动是将传动压力机的普通电机更换为伺服电机,即为伺服液压机,又称伺服压力机、伺服压装机。伺服液压机的滑块运动曲线可以根据冲压工艺设定,行程可调。这种压力机主要是针对难成形的材料,复杂形状零件的高精度成形。大大提高了压力机的加工精度以及冲压效率,而且还取消了飞轮,离合器等部件,降低企业生产的成本,节约能源。

伺服液压机的的发展受伺服电机的影响比较重,目前采用伺服电机驱动的液压机主要是一些小吨位的压力机。为了突破伺服电机的限制,混合驱动方式是目前压力机发展的一个方向。这种混合驱动压力机的构成方式采取差动轮实现普通电机和伺服电机的混合输入,采取两自由度的杆件系统实现混闭式双点压力机。

由于其伺服功能,滑块运动曲线不再仅仅是正弦曲线,而是可以根据工艺要求进行优化设计的任意曲线。由于采用线性光栅尺检测滑块位置,滑块在整个压力机工作全程都具有;高的运动控制精度,尤其在下死点附近,能够保证滑块的精度在±0.01mm变化;从而保证了压力机的闭合高度在生产过程中的精度稳定,抑制产品毛刺出现,防止产生不良产品。伺服液压机由于其保留了曲柄压力机的优点,尤其是生产率远高于液压机,体现了“液压机的加工质量,机械压力机的生产效率”。不仅如此,伺服电机驱动曲柄压力机还可以根据工件的不同,调整滑块行程,在一个工循环中无须完成360度旋转,而只进行一定角度的摆动来完成冲压工作,这就进一步缩短了循环时间。最大限度的减少了无谓的行程,大大提高了生产率。

 

伺服液压机和普通液压机的最主要的区别是动力源的不同。一个是利用液压系统里的液压油油缸产生压力,另一个则是应用压缩空气为动力源,利用压气缸来执行装置,这是它们的本质区别。

 

The principle of ordinary hydraulic press is that it is made of Pascal's law and driven by liquid pressure. There are many kinds of machines. Of course, there are various uses according to the needs. The hydraulic press is not only used for forging, but also for straightening, pressing, packing, pressing block and pressing plate.

The basic principle of the common hydraulic press is that the oil pump transmits the hydraulic oil to the integrated cartridge valve block, distributes the hydraulic oil to the upper or lower cavity of the oil cylinder through each check valve and overflow valve, and makes the oil cylinder move under the action of the high pressure oil. The hydraulic press is a device that uses the liquid to transmit the pressure. When liquid transfers pressure in a closed container, it follows Pascal's law. The hydraulic transmission system of four column hydraulic press consists of power mechanism, control mechanism, actuator, auxiliary mechanism and working medium. The power mechanism usually uses the oil pump as the power mechanism, generally the integral oil pump. In order to meet the requirements of the moving speed of the actuator, one or more oil pumps are selected.

The servo motor drive of hydraulic press is to replace the common motor of driving press with servo motor, that is, servo hydraulic press, also known as servo press and servo press. The movement curve of the slider of the servo hydraulic press can be set according to the stamping process, and the stroke can be adjusted. This kind of press is mainly for the high-precision forming of difficult to form materials and complex shape parts. It greatly improves the processing accuracy and stamping efficiency of the press, and also cancels the flywheel, clutch and other parts, reduces the production cost of the enterprise and saves energy.

The development of servo hydraulic press is seriously affected by servo motor. At present, the hydraulic press driven by servo motor is mainly some small tonnage presses. In order to break through the limitation of servo motor, the hybrid driving mode is a developing direction of press at present. The structure of the hybrid drive press adopts differential wheel to realize the hybrid input of common motor and servo motor, and adopts two degree of freedom rod system to realize the hybrid closed two-point press.

Because of its servo function, the moving curve of the slider is not only a sine curve, but also an arbitrary curve that can be optimized according to the technological requirements. Because the linear grating ruler is used to detect the position of the slider, the slider has high motion control accuracy throughout the whole working process of the press, especially near the bottom dead point, which can ensure that the accuracy of the slider changes within ± 0.01mm, thus ensuring the accuracy stability of the closing height of the press in the production process, inhibiting the occurrence of product burrs, and preventing the production of bad products. Because of the advantages of the crank press, the productivity of the servo hydraulic press is much higher than that of the hydraulic press, which embodies "the processing quality of the hydraulic press and the production efficiency of the mechanical press". Moreover, the crank press driven by the servo motor can adjust the stroke of the slider according to the different workpieces. In a working cycle, it does not need to complete 360 degree rotation, but only carries out a certain angle swing to complete the stamping work, which further shortens the cycle time. Minimize the unnecessary travel and greatly improve the productivity.

The main difference between servo hydraulic press and common hydraulic press is the difference of power source. One is to use the hydraulic oil cylinder in the hydraulic system to generate pressure, the other is to use compressed air as the power source and use the air cylinder to implement the device, which is their essential difference.

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