In the production process of low-pressure aluminum alloy wheel, the size and shape of the mold used are complicated. These molds are manufactured without the need for electric machine tools. In the 1970s, the electric machine tools and control systems consisted of discrete electronic components. Over time, electronic components are seriously aging, machine tools are frequently faulty, and cannot meet production needs. Using modern computer technology to transform the control system, it has three-axis digital display one-axis numerical control, automatic selection of processing parameters, single-pulse real-time detection fuzzy control and other functions, not only improve the automation level of the machine tool and increase 1.
Coordinate display and keyboard management system This electric machining machine is mainly used to process the circular top and bottom molds used in the production of the wheel. Before machining, first adjust the position of the tool electrode to ensure that the tool electrode is concentric with the workpiece. Moreover, no offset can occur during processing. To this end, the tool electrode is designed to be a manual servo digital display in the horizontal left and right direction (set to the X axis), and the front and rear direction (set to the Y axis), and has a lock switch. The important direction (defined as Z-axis) is designed for automatic servo closed-loop control and digital display. A measuring tape of 50 lines/mm is selected from the Z direction. The raster output signal drives the optical scramble device via the buffer stage (7407). The use of light scattering devices is to minimize external interference with the microprocessor. The raster signal is processed using a raster ASIC SJ20001'1. The dragon's direction grating is long, and each uses two. The state oil grating is shorter and uses one piece. Similarly, the output signal of the microprocessor is optically isolated, and a relay is driven by a triode to amplify. The normally closed contact of the relay is connected in series to the machine start logic ring, so that the microprocessor can control the start and stop of the machine tool and complete the closed loop control. The keyboard consists of 20 buttons, which are divided into numeric keys and function keys. The number keys include 0-9 digit keys and decimal point, clear key CE; the function keys 5 are depth setting keys, running keys, group by coordinate single/bidirectional display switching keys, regular/fuzzy working mode switching keys and Electrode fast rise button. Both logic and timing logic have solidified. In actual operation, the microprocessor outputs the discharge pulse according to the processing parameters and the processing state, and outputs it to the power output circuit via the photoelectric failure.
The system solves these two problems better. (l) Selection of processing parameters During the electrical machining process, the parameters of the discharge pulse (peak voltage pulse width, waveform, high voltage advance, etc.) and servo feed system parameters (servo voltage, electrode lift cycle, etc.) all affect the discharge state. Different discharge states correspond to different processing properties, so the optimum processing parameters must be determined according to the material and processing requirements of the tool and the workpiece. According to the previous work experience, the system stores them in EPROM27C128, and the user can select the group processing parameters through the band switch according to the material processing requirements. It avoids the operator's personal experience and affects the quality of processing. The selected processing parameters are stored in the RAM memory HK1225 with battery, so that the machine can be restarted after the machine is stopped. Moreover, the selected parameters can also be modified on site by pressing the button (+/1) on the panel.
(2) Discharge pulse generation and single-pulse real-time detection circuit ATV250O is a logic programmable device <2J. In the system design, various combinations of discharge pulses may be required according to different processing parameters. The system has a unique single-pulse real-time detection circuit and Protection logic implemented at sensitivity level. Can effectively identify abnormal discharge. Generally, discharge pulses can be classified into four types: normal discharge pulses, abnormal discharge pulses, short circuits, and open circuit pulses. According to this, different discharge states can be distinguished. The results show that the pulse voltage is related to the material during normal discharge, and the pulse voltage of different materials is between 16V and 20V. The microprocessor selects the pulse voltage for normal discharge according to the material of the tool used. The O/A conversion, the amplification circuit amplifies the discharge pulse, and the discharge pulse between the electrode and the workpiece is detected by the polarity conversion circuit and the voltage divider circuit, and the logic state of the result is different. The normal discharge is distinguished from the abnormal discharge.
Depending on the logic state, the ATV2500 can output different discharge pulses. In the normal discharge, the pulse output is selected directly according to the processing parameters; when the discharge state is abnormal, the software will change the pulse output of the ATV250O according to the set sensitivity to achieve automatic protection. In the fuzzy working mode, the software statistically analyzes the discharge state, and adopts measures such as accelerating the tool electrode lifting frequency and reducing the current output according to the fuzzy principle, gradually eliminating the bad discharge, and once the state recovery is detected, the original parameter will be operated. If the bad condition reaches a certain level, the machine will stop the discharge pulse output, the tool electrode stops moving, and the window displays C-C-C alarm.
(Finish)
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