Slow wire walking, also called low-speed wire walking, is a kind of CNC machining machine tool that uses continuously moving fine metal wire as an electrode to pulse spark discharge on the workpiece to generate a high temperature of over 6000 degrees, ablate metal and cut into a workpiece. The principle of wire processing is the phenomenon that there is a gap between the wire electrode and the workpiece, and the metal is removed by continuous discharge. Since the slow-moving wire cutting machine adopts the method of wire electrode continuous feeding, that is, the wire electrode is processed during the movement, so even if the wire electrode is worn out, it can be continuously supplemented, so it can improve the machining accuracy of the parts and slow the wire. The surface roughness of the workpiece processed by the cutting machine can usually reach Ra=0.8μm and above, and the roundness error, linear error and dimensional error of the slow-moving wire cutting machine are much better t
The static pressure slide rail (TTW guide) of the CNC machining lathe transfers the oil with a certain pressure through the throttle to the oil cavity between the sliding surfaces of the slide rail (TTW guide) to form a pressure oil film to float the moving parts , Make the sliding rail (TTW guide) surface in a pure liquid friction state. CNC machining General CNC machining usually refers to computer digital control precision machining, CNC machining lathe, CNC machining milling machine, CNC machining c17200 beryllium copper and milling machine, etc. The feed route of finishing is basically carried out along the part contour sequence. Therefore, the focus of determining the feed route is to determine the feed route of rough machining and idle stroke. In the numerical control processing, the control system issues instructions to make the tool perform various motions that meet the requirements, and the shape and size of the workpiece are expressed in the form of numbers and lette
KOVAR parts are commonly used as metal casing materials in the electronic packaging industry. Because they have a linear expansion coefficient close to that of molybdenum group glass, and can produce less sealing stress during the sealing (melting) process with molybdenum group glass, so To obtain good air-tightness, in order to make the metal tube and shell to achieve air-tight sealing, in the entire sealing process, the annealing process undoubtedly plays an important role as a link between the previous and the next. The internal stress generated during KOVAR machining also prepares the material structure for the implementation of the subsequent process-the sealing process of the metal parts. The main purpose of annealing Kovar shell before sealing is to: (1) Eliminate machining stress. When Kovar undergoes plastic machining deformation during cold working, about 10% to 15% of the applied energy is converted into internal energy, which is commonly referred to as internal stress,
At present, domestic motor vehicle detection and management systems are divided into centralized control and distributed control according to the microcomputer control mode.
The centralized control system uses a master control machine to complete the registration of motor vehicles and the inspection of various items across the line, without a station control machine. The analog quantity, switch quantity and pulse signal of each station on the detection line are transformed and isolated directly into the person and the host. Therefore, the entire system structure is relatively simple, easy to install, debug and maintain, and the system cost is low. The main disadvantage of the centralized control system is the heavy task of the host, that is, to log in to the vehicle to be inspected, and to monitor the inspection situation of each station, the operator is often easy to ignore the other. In addition, the detection line is generally relatively long (the entire line is about 50 to 70 meters long), and the operator can only observe the detection conditions of each station at a relatively long distance. Once the detection is abnormal, it is difficult to find and deal with it nearby. In view of the above reasons, as well as the substantial reduction in computer prices, distributed measurement and control systems are currently used more frequently. The tasks of each microcomputer of this type of system are clear, the workload is relatively balanced, and it is easy to control the beat of the detection signal of each station to be sent to the nearest station computer, which improves the reliability of the system.
In some unexpected situations, the operator can manually operate the station machine. Therefore, the distributed measurement and control system is obviously superior to the centralized control system in terms of scope of application, scalability, maintainability, and resistance to single-point failure. The system consists of a log-in management machine, a server and 4 workstation computers to form a distributed measurement and control system. Moden hub (I-lzB) four-station machine, three-station machine, one-station machine for ordinary local telephone network Figure 2 In a small network, the Ethernet network is cheap, easy to install and maintain, and can meet the requirements of most customers. At present Use *widely. In the physical network topology of the LAN, the star structure has the characteristics of low cost, easy expansion, and easy fault isolation, so it is widely used. In addition to supporting network operating system WindowSNT, such as symmetric multi-processor, deep embedded security, preemptive multi-tasking and software fault-tolerant system (including striped sets with odd and even parity (including RAIDS), etc. In addition to advanced performance, it also provides a comprehensive Internet/Intranet solution. In particular, its industrial-grade stability, security and reliability brought by the NTFS file system are particularly necessary for the automatic detection line.
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