Numerical Control Transformation of Ordinary Milling Machine for Machining Cam

1 CNC circular table Considering the rotation of the disc cam profile, a circular table is designed, which can rotate around the center of rotation or move radially. The rotation and movement are driven by two stepping motors respectively, the models are 0BF(1)3, the step angle is 0.75. The output torque is 0N.m, and the driving mode is phase six-stepping stepper motor controlled by digital system. Set the parent stepping motor to achieve circumferential rotation, +, and the direction is counterclockwise. In order to eliminate the transmission gap of the positive and negative rotation, the double worm worm gear transmission is adopted, and the rotation pulse amount is driven by the 3-way stepping machine to drive the radial movement. The ball screw nut is driven by the nut, and the nut and gasket pre-tightening method is used to eliminate the transmission backlash. The gear transmission mechanism adopts two thin gears to eliminate the gap. The radial movement pulse equivalent is used to improve the friction performance, and a rolling guide is used.

The round type is mounted on a 21-inch milling machine. It is bolted to the butt groove of the bed table, and there is no damage to the original function of the milling machine when the CNC is installed on the milling machine. It is necessary to ensure that the radial moving rail and the machine's å“š longitudinal rail are in the hall. Also ensure that the spindle axis of the machine tool spindle rotary axis 4 CNC table rotation axis is flat.

The plane where the latter is located must be flush with the radial movement direction of the CNC table.

To reduce machining errors. In the CNC machining process, the original feed mechanism of the milling machine + works. It should be deadlocked like a knife before machining. It must be adjusted using the original feeding mechanism.

2 CNC system hardware is considered from the performance price ratio. In the transformation, the digital control system of the single-chip computer with 80321 as the core is adopted, and 1 is the hardware structure frame of the system.

Used to store processed data, 2716 is used to store control programs. 3 also 5 through the decoder 74 has been used as a multi-way switch signal, 1 control the main motor start and stop, 6 output alarm signal. 23 separately control, forward and reverse to the stepper motor. 5 respectively control the inversion 1.7 output feed pulse to the stepper motor, 133.31 accepts the external interrupt signal, the start column scan can input the cam type surface plus the data remaining circuit + then repeat the 3 numerical control system software system. The system software mainly includes 1 minute in the system, and the column control program is actually a keyboard operation program.

Booting, the whole system work is controlled by the keyboard, each function key replaces the corresponding function + press the button and enter the control, key value, into each corresponding function, block 1 count value scan for the keyboard line. r order. Master program box 2.

It mainly includes functional procedures such as interpolation feed speed control. The interpolation program controls the circumferential and radial feed pulse number spleen, the 30 local ship 172 control 10 controls the general application, the 0 control controls the system, and the parameters are optimized and compared with the fuzzy controller. Results The response of the system under 56.6 interference is clear. The fuzzy controller is better than the control, whether it is shortening the adjustment time of the speed or the same interference of the system.

1 Li Benwei and so on. The application of stepper motors in aeroengine numerical control systems. Mathematical model and algorithm analysis of the micro 2 Song Dahe controller. Fuzzy mathematics. The 1983 method of connecting to page 161 is to use the old internal timer interrupt function. By giving Ding, the preset time + the same time is the first time to make the interrupt frequency different, and the interrupt frequency is used as the frequency of the feed pulse, thereby realizing the feed speed control. The speed control function runs through the interpolation program. The machining control program box, such as the 3 interrupt service program, considers that there may be a fault such as a broken machine power failure during the machining process, and the interrupt protection function interrupt number is set. The port input, the content of the interrupt service program mainly includes the current data storage of the shutdown alarm, etc. . After the fault is processed, press the continue function key to proceed with the machining. = 4 Conclusion The milling machine retrofit solution has low cost and can (1) process small disc cams with a diameter accuracy of 01. With the machine tool, after the circular workbench is removed, the function of the original ordinary milling machine can be restored, so it is an economical and practical numerical control transformation method.

1 Lu Jingui. Cam manufacturing technology. Beijing Machinery Industry Press. 1986 2 Liao effect. Digitally controlled machine tools. Wuhan Huazhong University of Science and Technology Press, 1991 3 Cao Qiaoyuan. The principle and application of single chip microcomputer. Beijing Electronic Industry Press. The adoption of 1997.1 is the same. 17 colleagues. The absolute value is the smallest integer equal to 1+ and 1. The above formula satisfies the responsiveness of the 2 controller. The effect in the above equation is equivalent to the effect of the slope of the switching line in 2, and the degree of weighting of the pair. In this way, different control zones can select different values. It is only necessary to change the parameters to quickly obtain the actual control law, which makes the computer's optimization of the fuzzy model fast and possible. 3, the application of control algorithm research and conclusions After using the switch design method to obtain the actual control law, first use the cloth program to store the control law in the computer memory. In the real-time control of the engine speed system, the symbols and values ​​calculated for each sampling can be used to find the output of the final control actuator stored in the computer memory. This control of 8 inches in real time is very beneficial to reduce the response time of the system, which is unmatched by many control theories.

The school paste control program designed by Lee has a dynamic small deviation from the simulation system. 1 in. The mathematical model of the stepper motor system stepper motor and the drive part takes into account the dynamic characteristics of the motor itself. , describes the connection between the microcomputer 4 motor and research.

The transfer function of the stepper motor system can be a series connection of the S-order holder and an integral link.

Learning description 3, the oil supply amount and the number of pulses are basically similar to a proportional relationship.

When the door switch is fully closed, the relationship between the IK1 and the number of pulses in the engine maximum or rated state experiment may not be considered. Since the motor drive shaft of the digital constant oil supply device is connected to the motor + to avoid gaps. When the motor is positive and reverse. There is a small gap nonlinearity in the relationship between the amount of supply and the number of pulses. It has been determined that the time constant of the wood supply device is negligible compared with the engine. Therefore, the mathematical model of the numerical control constant oil supply device can be approximated as a combination of the proportional link and the gap nonlinearity. The scale factor can be obtained from the results of 3.

The experimental conclusions are as follows: (1) After using the potentiometer instead of the numerical control constant quantity oil supply device to obtain the fuzzy control law, the dynamic simulation experiment is carried out with the real numerical control constant quantity oil supply device. If the fuzzy control law is constant, the output has equal amplitude oscillation instability. This is mainly due to the non-linearity of the gap. For this reason, by using the superiority of the fuzzy control switch design, it is only necessary to change the value to quickly obtain the ideal control law of the energy index. The speed change curve 4. At the same time, the fuzzy control is on the line of the system.

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