The real-time data acquisition system of CNC machine tools can not only provide timely and accurate operation of CNC machine tools, but also provide accurate and reliable technical data for scientifically preparing production plans and provide timely, reliable and accurate reference information for production and operation decisions for the upper system. Therefore, the real-time data acquisition system of CNC machine tools has important practical significance for exerting the potential of CNC machine tools, making full use of manufacturing resources, and improving the productivity, competitiveness and economic benefits of enterprises. The following is an example of the HEIDENHAIN high-end CNC system iTNC530, which briefly introduces the application of the system in the real-time data acquisition system of CNC machine tools. First, HEIDENHAIN DNC function First of all, it is necessary to judge whether the DNC (Direct Digital Control) function of the numerical control system is open. Only with the DNC function, the data acquisition system can communicate with the CNC system via the HENDENHAIN DNC software interface. HEIDENHAIN iTNC530 system NC software 34402x-xx version, its DNC function is open by default, and for NC software 34049x-01 or later, you need to determine whether you need to purchase authorization. In the program editing mode, press the MOD button to enter the password input page and enter "SIK". Check whether the #18 parameter in the SIK page (as shown in Figure 1) is ticked. If ticked, the DNC function is open. If it is not checked, you need to purchase the "iTNC530 System DNC License". Figure 1 SIK page At the same time, special attention should be paid to the NC software 34049x-01 and below, the EXTERNAL ACCESS menu under the system parameter page should be set to ON. In this way, the relevant state and processing parameters of the machine can be acquired. Second, HEIDENHAIN SDK software development kit The machine data real-time acquisition system is developed on the basis of the SDK software development kit provided by HEIDENHAIN, and communicates with the numerical control system through the LSV-2 protocol. In the WINDOWS operating system development environment, the SDK software development kit provides two software components: COM components and ActiveX controls (Figure 2). These two components are based on Microsoft COM technology and are not restricted by programming languages ​​and can be used in the WINDOWS98/ME/NT4.0/2000/XP development environment. During the installation of the SDK software development kit, these software components are directly registered in the operating system and can be used in the development environment. Figure 2 data acquisition software framework diagram Third, the machine status and parameter information The HEIDENHAIN control system is equipped with an Ethernet interface. By simply setting the system IP address and server IP address on the same network segment, it is easy to collect the machining status and related parameter information of the machine through the data real-time acquisition system software. The information collected by the data acquisition system includes basic information of the machine tool, machine axis information, and machine tool processing information (Figure 3). The software can monitor the operating status of the machine 24 hours a day and record the running time of each state. The data such as the power-on time, power-off time, start-up time, and running time of the obtained machine tool are further analyzed and processed to obtain a more objective equipment utilization rate. Figure 3 HEIDENHAIN monitoring status diagram Fourth, summary Through the real-time data acquisition system of CNC machine tools, we can obtain various state information in the process in full, real-time and accurate, and based on this, we can effectively control and manage the manufacturing process, give full play to the potential of CNC machine tools and improve the productivity of enterprises. , competitiveness and economic benefits. references: 1. HEIDENHAIN iTNC530 Service Manual, May 2006 2. Shaoshili, Ye Wenhua, Research on real-time data acquisition and monitoring system for CNC machine tools, China Manufacturing Information, No.11, 2008 3. Xie Xiaoxuan, Zhang Hao, etc., Design and Implementation of Remote Monitoring System for Machining Center, Manufacturing Technology and Machine Tools, No.6, 2001 Article author Hu Hui , Department of Mechanical Power, AVIC Changhe Aircraft Industry Group Co., Ltd.
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