Semi-automatic multiple blade lathe control system based on PLC

Hydraulic semi-automatic multiple blade lathe C7632 ownership is more of a semi-automatic machine tools is machinery industry. It adopts the diode matrix sequence control device and relay logic control system, hydraulic drive tool post for vertical and horizontal movement in two directions, up and down is equipped with hydraulic chuck. Its processing automation and high production efficiency, suitable for bulk workpiece turning processing. But as a result of the machine tool system USES a discrete component, is out of order, and repair more troublesome, affect the normal play of machine tool performance. We according to the problem of the machine tool, the retrofit programmable controller to the control system, to overcome the above shortcomings, make the machine work reliable, convenient maintenance, greatly improving the efficiency of the machine tool, has achieved good economic benefit. 1. In the selection of PLC ( 1) Control object input and output points of the input point is working for machine tool control button, selector switch, trip switch, proximity switch, etc. Dots is the contactor to control motor, control the motion of hydraulic solenoid valve and indicator lights, etc. Considering the saving transformation change fees, should try to compress the input and output points. In some cases, the input point can be a little bit. As a travel switch only useful when automatic cycle, and a button only in manual adjustment, and when the input point is not enough, is the two input signals can be Shared a PLC input point, using PLC instruction label, will not confuse the two signals. Also, to save the output point, also has nothing to do with the automatic control can be output points, such as motor starting, stopping, still use high voltage loop control. ( 2) Control object of input, output, types of general machinery processing equipment, USES the switch quantity control, selection of dc input, relay output type PLC. Input ac type and TTL level, while the output is dc type transistor, thyristor and can adapt to different needs. There are various special types of modules, such as A/D, D/A module, external adjustable timer/counter module, high-speed counter module and so on. 2. The PLC controller program compilation step ( 1) Prepare a list of the switch of the machine tool components assigned to each input and output of PLC input and output point, namely the assigned address. C7532 lathe parts of the switch table, for example, see table. ( 2) According to process requirements, prepare a list of the action flow chart or switch action to C7632 lathe tool post under a process as an example, the action flow chart as shown in the figure below. ( 3) To formulate program block diagram block diagram can be reference to computer program block diagram of the preparation method. In the application of C7632 lathe as an example, the following figure. ( 4) Ladder diagram program according to the diagram, the switch table and table can be directly on the programmer of action on the keyboard key program. Program segments, to the automatic cycle program segment, manual adjustment program segment, the initialization section, subsection simulation run after together after debugging. Utilizing transfer, label instructions, can be complicated program decomposition can success, is advantageous to the programming and debugging. With semi-automatic lathe automatic cycle and manually adjust the program, for example, if the switch since 1127 for manual/selection switch, according to the following method program ( See image below) , 20, 40, and back to the beginning, perform manual adjustment program; , 40, and back to the beginning, the implementation of automatic cycle program. The automatic cycle working section of the program, recoverable this controller programming language specially designed for sequential control of step function. Ladder diagram are compiled, and through the simulation running, through the printer to print the ladder diagram text. When PLC controller is installed on the field devices can be programmed to implement its online, using the fault detection point to check the input and output components whether field devices are connected correctly, the work is normal. Under the online state, ladder diagram program operation, monitoring, modified, and the operation result until the program runs completely conform to the requirements, can make the PLC control equipment to work normally. 3. Conclusion after the retrofit PIC change C7632 lathe, lathe electrical failure to reduce more than 90%, the efficiency is greatly increased. As a result of the PLC control function is strong, raise the degree of automation of machine tools, is increasing the various protective functions for programming, make the machine tool will not damaged by wrong operation. The whole transformation process took less than a week, down time is only two days, cost less than 3000 yuan. So we think, PLC C7632 lathe and similar transformation of the machine tool, is completely feasible and easy effective technical shortcuts.
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