Maru Xiaofeng Wang Hualong tooth; ship, ãœ, æ®´, ç—‰ 23. Yangzhou 2250 paragraph theory. Point out the method and steps of designing the numerical control system, and explain the control module of the control system of the stepping motor. The introduction of the 06332 lathe is mainly used for the processing of small and medium-sized shaft discs and threaded parts. These machining processes require the machine to complete the work, control the spindle forward and reverse and emergency stop; the tool holder can realize the vertical and horizontal feed motion, and can automatically change the four stations at the tool change point to select the tool; Start and stop of the pump; lubrication of the pump switch. When machining the thread, the spindle is rotated, and the tool holder can move the lead of the machined thread to realize linear and circular arc interpolation. The main transformation part is to remove the feed ç˜ slide box light rod, replace it with the gap gear and the stepping motor; remove the original screw and replace it with the ball screw nut pair; replace the manual square tool holder with the CNC turret in the seven axis Add 1 encoder to introduce the numerical control transformation of 6132 boring machine. 1 Design and calculation of longitudinal feed system 1.1 Calculate the total efficiency of cutting force, take 65; especially feed system power, take 52.7676.381; transverse cutting force The design of the factory 1.2 ball screw calculates the axial force of the screw of the comprehensive guide rail lathe. Factory = 76.38; for the friction on the guide rail, the coefficient is 0.17; the brother is the main cutting 9 feet = 15276 1 is the scene of the table acting on the guide rail. Approximately 5 is the pitch of the ball screw. 5=6, then take the life time 7=15 0001. Then the life value 1 is the most fire-bearing plant 0 1.25 hardness coefficient do = number is 83263.5 watt 2. That is the intubation type external circulation displacement lead single nut self-pre- tight. Right-handed. The pitch is 6, the rated load is 689, so the strength is sufficient. 1 The efficiency is calculated. The screw angle of the selected ball screw is 325, the friction angle is 7=325, and the transmission efficiency of the ball screw is the torque required for rapid feed. Since the diameter of the original screw of the machine tool is milk, the diameter of the screw used now is the same as that of the milk 25, so there is no question about the rigidity and stability, so it is not checked.
The design of the transverse feed system is similar to the design of the longitudinal feed system. The juice calculation is omitted. The selection of 2 gears and stepper motors is related to the gear calculation of the gear ratio.
Taking into account the structure of the machine tool ==
Feng experience takes 12, horizontal, and wheel design from slightly.
2.2 Selection of stepping motor 3 Calculation of moment of inertia The mass of the table is converted to the moment of inertia of the rotating inertia screw on the motor shaft. The moment of inertia of the gear is negligible. Then the calculation of the required rotational torque of the total rotational inertia 1 is the torque required for the rapid no-load start. The maximum friction torque required for the crankshaft 1 when cutting the load is the acceleration torque that is converted to the motor shaft. For the cutting load torque on the motor shaft, the required torque for fast no-load start-up is the maximum torque required for the cutting load. Therefore, the maximum torque required occurs from the fast-starting, for the stepping motor with the working mode of six-shot. Its torque rc = Mmax0.866 = 31.6kgfcm.
The highest working frequency of the stepping motor is selected by the 0BF003 type DC stepping motor. The maximum static torque is 800Ncm=81.6kgfcm. According to its torque frequency characteristics, the motor is seen in the 3 199425. Artemisia, forbearance, dish view, r power amplifier circuit, and speed control subroutine in the program design, so as to avoid out-of-step phenomenon when starting and stopping.
2.3 Gear gap adjustment link CNC machine feed system is often in a state of change. In the reverse direction, if there is a gap between the gears of the drive chain, the reverse of the feed motion will lag behind the command signal, thus affecting the driving accuracy. Therefore, the gears of the 3240 must also be taken to eliminate the gap between the gears. spring. To improve the driving precision of the CNC machine feed system.
The adjustment of the gear gap is realized by the cylindrical sheet gear adjustable pull 25 wrong tooth method, and the structure 1 is not.
The lugs 4 and 8 of the thread are hooked at the end of the lug 4 at the end of the lug 4, and the extension length of the screw 5 is adjusted by the nut 7 and the nut 7 is locked.
3 CNC system hardware and software design The system mainly includes the central processing unit 280, the memory selects 3 pieces of 218 bits of 2716 1 foot 0 and 2 pieces of 218 bits of 66 recognition, the monitoring program is solidified in 1 piece of 2716 redundancy 1 , each function module The program is stored in a single piece of 2716 only 0 cubits, leaving the program. The advantage of this arrangement is when replacing the part processing program. Just replace one chip. Two pieces of 66 are added as intermediate data storage for the debugger to store and run the program.
The chip selects 280 sub 10. Its mouth serves as the output port of the stepping pulse of the feed system. Among them, the output port is a position control mode, which means that the ugly line is the 6-input and the 35 is the emergency stop number input. 87 for the system work normal alarm signal output select 2801 counter timer chip 1 piece display consists of 6 bits.
Two small optical isolation circuits are connected between the interface circuit and the power amplifier. The power amplifier amplifier circuit uses a dual power supply type. slightly.
2 The optical isolation circuit software design adopts modular design. It mainly includes the main module subroutine module and the timing interrupt module. The åž module is smashed into milk and initialized and monitored. The initialization should include the anti-initialization of 01, and also includes the initialization of the original keyboard buffer and the explicit buffer. The monitoring mainly includes keyboard management and display management, and both the keyboard management and the explicit management subroutine in the original monitoring program can be called. The function sub-modules include + and + and 310 function sub-modules, and can call many sub-programs in the original monitoring program. The interrupt module includes an emergency stop interrupt module alarm interrupt module and the like.
4 Conclusion After the transformation of the machine tool, the production efficiency is 34 times, the price is only the full-function CNC machine tool 13 14 machine tool positioning orange degree reaches 0.0330, å©, 屯 4 positioning accuracy reaches 0.015, 1 Lin Qijun machine tool CNC system Beijing China Science Technology out 2 Zhao Changde. Microcomputer principle and interface technology. Beijing Science and Technology Press, 1990
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