Research On Monitoring System Of The Parameters During Inertia Friction Welding

The thesis mainly introduces the development of CT25 special type friction welding machine. Data acquisition system,serial communication and the process control of the machine are clearly illustrated. The system is composed of industrial computer ,application software and instrument hardware. The model is also called as virtual instrument (VI), which means that the software unites the computer and instrument hardware and users can manipulate the computer as an own designed traditional instrument. When the request is changed, designer can add or delete the module of hardware and software to satisfy the requirement.Industrial computer is critical element of the hardware of CT25 special type friction welding machine. According to technical requirement of the system, multifunction data acquisition card without D/A output is chose. Hydraulic pressure signal,rotation speed signal and status signals are transmitted to the card after necessary adjusting. The displacement signal is transmitted by means of serial communication. At the same time, the method of anti-jamming is mentioned.The software system using LabWindows/CVI language, based on Windows 2000 system, realizes the functions of setting parameters,measurement,displaying of the welding process and saving data. Dynamic link library,multithread ,serial communication and adjusting of the signals are critical technology. The device driver is implied in the manner of the dynamic link library in the LabWindows/CVI environment. Link library is the key to DLL. Multithread is implemented to resolve the requirement of different tasks in the process. In order to save the cost of the instrument and guarantee the correctness of the serial communication, the arithmetic of adjusting signal and the selection of the numeric filter are thought about.In short, according to the requirement of user and combining with the technology of automation control, computer ,network communication and new friction welding, the thesis based on the analysis on requirement of the friction welding measurement system designs and develops a set of software which can realize the real time measure and data process after the event .