Control machine machining technology CNC machining engineering ceramic parts approach, 2 ultrasonic milling processing principle Ultrasonic milling machine processing principle 1. Change the ultrasonic molding process complex surface tool for the shape of a simple pencil-shaped tool tool cross-sectional shape can be The warm square tube and the like simulate the milling mode of the vertical boring machine and use the 00 program in computer control. Dimensional contour machining is realized in the 7-plane, and layer-by-layer feeding is realized in the 2-axis direction, and the molding process of the complex profile is converted into layer-by-layer removal processing. In this way, the compensation between the tool and the workpiece is transformed into the contour machining in the dimension plane and the tool wear and compensation on the shaft 4 . As long as the wear of the tool in the 2-axis direction is compensated in real time during the machining process, reasonable compensation of the tool can be achieved. Processing efficiency can be improved by optimizing the machining path. Fund Project National Natural Science Foundation Key Fund Project 599350 Received Date 200103 05 The frame structure of the CNC vertical milling machine for the super-jinning milling machine body, the 7-axis CNC linkage enables the workbench to drive the workpiece to complete the processing trajectory in each layer 7 plane . The spindle uses an AC motor to shoot, the device and the variable towel bar drive the tool head for the rotary bamboo movement, and the 7邾 servo motor drives the rotary motor transducer horn tool head and other left shaft components for the 2-way feed motion. The 2-axis servo motor is controlled by the computer and the position control card for feed control. The ultrasonic milling machine uses a pressure sensor to detect the machining pressure between the tool and the workpiece in real time, and uses this pressure signal to achieve constant control of the 2-axis pressure. The position signal fed back by the servo motor photoelectric encoder and the signal fed back by the pressure sensor make the entire 2-axis servo system form a double closed-loop control. When the pressure sensor detection value is lower than the preset value of the machining pressure, the 2-axis workpiece feeds a displacement; if the detection pressure during machining is larger than the set value, the 2-axis appropriately retracts the displacement. By real-time control of the processing pressure, the online compensation of the 2-axis simple shape tool is realized, thus ensuring the machining of the parts. 3 CNC system hardware system, ultrasonic milling machine tool numerical control system hardware, industrial control computer position control device pressure detecting device servo mechanism and The mechanical execution system is composed of several parts. 2. Among them, the industrial control machine is the core of the whole CNC system. The position control module mainly completes the pulse distribution and fine interpolation of each feed axis, so as to control the work of the servo motor according to the numerical control command. This CNC system adopts Taiwan Advantech, and the 0832 intelligent axis servo motor control completes this function, which can realize precise axis position control. The core of the data acquisition module is to convert the analog voltage signal of the pressure sensor into a digital signal that can be read by the computer. In, convert the device. In the ultrasonic numerical control system, we use the 1818. Multi-function data acquisition card produced by Taiwan Advantech. The function of the servo mechanism is to convert the command signal from the position control device into the movement of the moving parts of the machine tool, so that the table and the spindle head move according to a predetermined trajectory. The servo mechanism includes two parts, a driving device and an actuator. In the ultrasonic milling machine, the drive of the servo mechanism is selected, three volumes of 80-degree digital AC servo motor, and the actuator is a precision ball screw pair. 4 CNC system software 4.1 software function super-heart-cutting CNC software to complete data processing CNC process control and other functions. Software structure box 3. The specific functions completed by each module are: processing the input ±, completing the data generation and preprocessing. The interpolation data operation is performed using the slice data file matched with the numerical control system, and a data file for automatic processing is generated for the interrupt program call. The CNC machining system includes manual adjustment and dynamic machining functions, manual adjustment of the dry click and origin (1) in the machine position adjustment and test operation. The automatic processing reads the data file generated in the data processing stage, and processes according to the program. The parameter setting sets the machine parameter operating parameters and processing parameters to help provide the use of the ultrasonic milling machine. 4.2 Key technology of CNC software implementation When designing software, the key technology involved in CNC system is the heart. The development of real-time position control and pressure collection system under 98 needs to solve the problem of real-time interrupt processing, solving technology or virtual equipment turbulence program technology. This CNC system realizes the use of real-time interrupts, technology. The following is a description of the interruption of the ultrasonic milling CNC system. The ultrasonic milling CNC system uses 832 as the position servo controller. It has two interrupt sources, namely interrupt sum, 1 pray, 1 call 7 and 1 call 3. To give the platform, call the interrupt service program. The implementation framework, the dynamic connection framework, including the top part 1. The module definition file is compiled to provide input information for defining library attributes, including, identification, information copyright declaration library code segment attribute library data segment attribute local stacking and guidance. 1 number statement, etc. The header file implements the declaration of the function prototype. , 1 source code file top 1 team. Real function. The description of the number of 1 number 31. The sequence of code segments and the number of non-abandonable statements 1 off 00 people 拈 1. Stone 6400 interrupt end function declaration, header file 10 frame extemCr! The following is the export function below the open interrupt. Interrupt function prototype declaration, function function file top, let, file connection entry main function function rlumDDA disconnect interrupt function program real-time task processing outportb0xm0x20; avoid interrupts are repeatedly called enableO at lower priority; system open interrupt other The function is slightly 5 knot art language ultrasonic milling machine numerical control system development 仵 hardware adopts the popular open modular structure, with industrial control computer and special control card to form the control core, this structure has a short development cycle, low cost, safe and reliable system The advantages. The software uses dynamic link technology to handle real-time interrupts. This treatment method is highly transplantable. Can be applied to 05 environment 1 development of most real-time systems The entire CNC software uses surface object programming technology, in the 1C6.0 integrated development environment to complete the ultrasonic milling machine based on the idea of ​​removal. It solves the problem that the tool loss in the traditional ultrasonic machining is serious and can not be compensated online, so that the complex surface of the processing belt, the sharp corner and the sharp edge can be repaired, and the ceramic parts become possible, which provides powerful technical support for the wide application of engineering ceramics. 2 Zhao Fuling, Feng Dongju, Shi Juncai and so on. Ultrasonic rotary processing technology for ceramic materials. Electromechanical 3-way shovel and other dynamic gastric exchange program design Beijing Beijing Aerospace University Press, 1995. 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