At present, the application of cam controller has changed from mechanical type to electronic type, and it is more and more popular in mechanical press. The use of electronic cam avoids the defects of traditional mechanical mode. Even for the production of more complex process equipment, electronic cam has obvious advantages with its precise control ability. The safety of the bed is well guaranteed. More and more mechanical equipments are widely used in people’s life, such as mechanical press electrical control system, whose important component is the cam controller. However, the main function of the cam controller is to deal with the logical relationship of the working mechanism in the working cycle of the mechanical pressure mechanism. This rigorous working mechanism is mainly composed of the cam controller. The cam controller is mainly used to distribute the rotation angle of the crankshaft and send out corresponding signals, so that the electronic control system receives signals to give instructions to the working mechanism. Now this paper introduces two kinds of cam controllers, one of which is mechanical. This kind of mechanical cam controller appeared earlier and has many problems. For example, its working efficiency is not high. The main reason is that the installation steps of the mechanical connection are complicated, and its complexity is beyond our understanding, and it is completed. After a series of work, it should be maintained correspondingly: besides, the noise in the operation is too loud to bear; moreover, it can not adapt to different types of templates, the most important thing is that it has poor measurability at the stage of installation and design or after the final completion of the machine, and it can not predict the performance of the machine: this mechanical convexity Wheel controllers are particularly unsuitable for high-quality products in stamping industry.
As long as the speed of machine tool is fast, the output of cam will lag behind relatively. The main reason for this phenomenon is that it can not meet all kinds of accuracy required by the process.
More troublesome is that the mechanical cam is generally installed on the top of the machine tool, and it is difficult to adjust the angle, which is not only time-consuming. In addition, once misaligned, it is easy to cause machine tool insecurity. In order to make up for the shortcomings of mechanical type, electronic cam has appeared. With the development of domestic manufacturing industry, electronic cam has been widely used and the demand is increasing. More importantly, electronic cam is an indispensable part of mechanical press. The application of electronic cam is not only convenient, but also simple. Since it replaced mechanical cam, our work efficiency has been improved a lot. Now let’s talk about its operation process. First, the mechanical cam and transmission mechanism on the press are removed, then the electronic cam is installed on the operation panel of the press. Then, the crankshaft and the encoder are closely linked through the 1:1 deceleration ratio, and the cable drawn by the encoder is connected to the socket behind the electronic cam. With the rotation of the crankshaft, the encoder also starts to rotate.
The electronic cam will convert the received encoder pulse signal into an angle or stroke speed on the display. The cam angle range we need can be set arbitrarily on the surface of the cam. Now let’s give you a classic example, that is, the PAC10 electronic cam in Nanjing Eston. Its special feature is that it can provide ten sets of independent cams, and each set of cams can carry out the output terminals of the system. Its output forms are quality control output and relay output. We can directly access the PLC or intermediate relay according to the signal needs. Device. It has many advantages, so that we can intuitively see the electronic cam display ratio, through the digital tube we can also intuitively see the angle and stroke speed, thermostatic element directly set the angle on the panel with keys, not only simplify the machine structure, but also more convenient for daily maintenance. It not only realizes the high precision control of die and feeding mechanism, but also achieves the angle analysis rate of PAC1 0 to 0.25 degree. We divide mechanical press into constant speed press and variable speed press. As the name implies, the difference between them lies in the fixing and regulating of impulse pressure.
Fixed-speed press mainly uses a group of cam angles to brake the clutch. If the time of braking stopping dead point is too long, wear will occur, resulting in worse braking performance, resulting in deviation when the slider stops dead point. The biggest trouble for users is to regularly adjust the cam angle used for braking. If the speed-regulating press is used to stop it to the upper dead point, the braking angle is determined by different motor speeds using the open-loop control method and the control of mechanical cam.
We can not get the feedback signal of the actual angle, which causes many uncertainties, such as the inability to stop at the upper dead point, or the large deviation of the upper dead point angle, or the abrasion of friction discs which may lead to the inaccurate stop. On this basis, we will switch to closed control. The problem of inaccurate stopping dead point can be solved by using electronic cam.
Moreover, it will no longer distinguish between fixed speed and speed, so that the principle of stopping dead point can be realized. Through each stamping of the slider, the working speed is detected and the angle of each inspection is calculated. At the same time, we calculate the speed parameters of the braking position by a set of special control signals.
This speed is neither the average speed nor the instantaneous speed of the braking position, but the instantaneous speed and the average speed of each point before the braking position. Then we can get the parameters by a certain algorithm. So the electronic cam ensures that the slider can stop the dead point accurately.
Electronic cam PAC10 has many functions, such as real-time monitoring of the braking angle of clutch brake, braking speed, braking stability and braking performance; its system can not only remember the number of clutch, but also determine the frequency of clutch use. The performance of clutch brake determines the performance and use of press.
It is an important functional component.
The maintenance and maintenance of machine tools are also based on the data monitored by the system.
We use software to prevent the second fall of machine tool slider. When the press slider stops dead point, it can be restarted (and clutch suction, slider down), but the premise of this foundation is to loosen the start button of slider operation. In order to avoid long-term use leading to aging or button quality problems caused by bonding, so that personal safety accidents occur. Whether mechanical or electronic, they need to have a connection device. If the problem arises on the connection device, there will be a phenomenon of continuous impulse, which is also unsafe. At this time, we should install a signal detection point on the fixed position of the crankshaft of the machine tool. Through the feedback of the detection signal, we can compare the last signal with the collected signal. If there is a deviation, we can immediately output the stop signal to ensure personal safety. We see that the emergence of electronic cam is not only to replace mechanical cam, but also with the rapid development of electronic technology, the new function of electronic cam not only improves the performance, automation level and security of machine tools, but also continuously develops to the direction of network and intelligence, creating another impossibility for the future. Miracle.