The CK8011F heavy-duty special CNC lathe designed and produced by a company is mainly used for processing special parts such as railway long shafts and wheels. In order to improve the processing technology, improve the processing precision and improve the production efficiency, the machine tool is equipped with two tool holders, two spindles and two sets of feed axes (ie two X-axis and two Z-axis). 1 is shown.
The machine tool uses two sets of SINUMERIK 828D PPU260.2 numerical control system to control the corresponding tool holder and X-axis and Y-axis respectively. The two CNC systems use a 16kW power module (ALM) and interface module (AIM) for all the advances. The DC bus voltage is supplied to the shaft; the two feed axes are respectively controlled by two 2X18A power modules S120, and the encoders of the respective feed axes are respectively connected to the corresponding interfaces. At the same time, the two spindles of the machine tool are driven by Siemens G120 driver to control the 30kW inverter motor. The external encoders of the two spindles are respectively connected to the corresponding PPU260.2 through the corresponding encoder interface module SMC20 to realize different processing. demand. The specific control system connection is shown in Figure 2.
When the machine is working, the left CNC system takes precedence over the right CNC system. That is to say, after the left CNC system is started, the right CNC system can be started; after the left system is normal, the right system can work normally. Similarly, after the system on the right is normal, the system on the left can work normally. If the system on the left is in an emergency stop state, the system on the right cannot work normally, and the system on the right is in an emergency stop state, but it cannot affect the system on the left.
Therefore, data communication must be carried out between the two CNC systems during the control process to achieve the above requirements.
1. Analysis of data exchange methods
With the development of CAD, CAM, CIMS technology and numerical control system, there are more and more communication methods between CNC systems and CNC systems and computers. The communication or data exchange between Siemens SINUMERIK 828D CNC systems used in this machine mainly includes the following:
(1) PN/PN coupler data exchange method The PN/PN coupler (PN/PN Couple) is one of the basic methods of communication between two CNC systems. The Profinet interface PN2 of the SINUMERIK 828D PPU260.2 is connected to the PN/PN coupler via a peer-to-peer cable. The other Profinet interface PN2 of the SINUMERIK 828D PPU260.2 is also connected to the coupler via a peer-to-peer cable, in the two SINUMERIK machines. After setting the corresponding parameters, IP address and interface on the 828D, you can use the dedicated Data Block in the S7-200 PLC. The two CNC systems simultaneously read the variables and corresponding interface signals in the dedicated data block. Write operations to enable data exchange and other different functions.
For more information, please see Metalworking (Cold Processing), Issue 19, 2013 or download attachments:
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