The application of PLC in tire mold edm machine

1 the introduction with the rapid development of automobile industry, people is higher and higher requirement for the properties of the tire, which greatly promoted the development of the tire mold manufacturing technology. Simple tire mold surface decorative pattern in the past, and now the tire mold surface has many of the same shape or not of the same unit bump arranged according to certain rules, because the precision and quality of the decorative pattern on the tire mold will directly affect the quality and performance of the tire, so on edm machine processing tire mold, to make the arrangement of regular pattern, it must to the mold accurately dividing. 2 technical requirements the tire mold edm machine can produce tire mold inner diameter of 500 mm to 1200 mm, and the score is 2 ~ 500 pattern of all sorts of tire mold, precision rotary table is not less than 0. 017°。 In the model, Adjust the mold center and workbench coincides with the center of the circle) , the workbench turning speed of 0 ~ 0. 5rpm; In manual adjustment mode, the workbench turning speed of 0 ~ 0. 5rpm; In automatic machining mode, the workbench turning speed of 0 ~ 0. 25rpm。 All working parameters can be adjusted and set from the man-machine interface. Three automatic indexing system, hardware configuration and software and hardware design. 1 automatic indexing system in guarantee under the premise of meet the test requirements, as far as possible choose cost-effective, reliable operation, short development cycle. After comprehensive consideration, using touch screen as upper computer, PLC as lower machine design. Using RS - 232 serial port communication to complete data transmission. System block diagram is shown in figure 1: touch screen is dedicated to the application of PLC, it is different from some simple instrument type or other simple control equipment of the PLC, it is powerful, easy to use, strong anti-jamming capability, very suitable for modern industry more and more huge workload and function requirements, it has increasingly become one of the indispensable equipment of modern industry. A programmable controller is easy to extend, under control is simple, strong anti-jamming capability, price is low wait for an advantage. PLC as lower machine finish dividing control, processing control and encoder feedback data, and other functions. 3. 2 hardware configuration of the control system according to the performance requirements, from an economic perspective, choose the main components: ( 1) Touch screen with EASYVIEW MT508S. This series of man-machine interface in addition to having the general function of man-machine interface, also provides many unique features: a) Six pop-up window can be open at the same time. b) Can have as Windows95/98 task bar and quick selection window. c) Using powerful 32-bit RISC processor ( Intel StrongARM) , make MT508 has faster processing speed. ( 2) Rotary encoder adopts NEMICON Japan precision for 5400 p/R products of the company, it will be the workbench position feedback signal to the PLC, then by the PLC after data processing, control stepping motor movement, so as to achieve the purpose of precise control table position. ( 3) PLC used FB series of FBE - of the company 20MC。 By using this series PLC is mainly for two reasons: a) The hardware circuit is adopted to form the hardware of high speed counter ( HHSC) The supreme count frequency 20 KHZ, and is a 32-bit high speed counters. B) PLC counter with four times the frequency circuit, the encoder signal 4 segments, improve the system accuracy. Using a set of hardware high-speed counter for counting pulse encoder feedback. FB - Each group of hardware of PLC high-speed counter counting has eight kinds of patterns to choose from, we chose MD7, namely the input signal to the pulse signal of the phase difference of 90 °, the two-way signal along the rising or falling count respectively, so the high-speed counter will count four pulse, as shown in figure 2. The precision of the original encoder feedback signal is 360 ° present 5400 = 0. 067 °, which obviously can not meet the requirement, but after a subsequent circuit level four times the frequency conversion and PLC circuit after segmentation, without adding any hardware under the premise of making the resolution of the encoder to 360 ° present 5400 present 4 = 0. 017°。 In dividing control system, we will be the number of pulses encoder feedback compared with PLC to calculate the target pulse number, if the feedback value less than or greater than the target, then workbench haven't reached the target position, if two values are equal, then the workbench has reached the target location. Using this method to realize the workbench position closed-loop control. ( 4) 领域, 20 MC is the core of the control system device, the input and output signal distribution as shown in figure 3:3. 3 PLC controller program flow chart of PLC program flow chart as shown in figure 4:4 rationality and reliability of control system design of this tire mold edm machine although there aren't many measurement and control object, and the mechanical structure is not complicated, but workbench is big, the moment of inertia is big, edm when interference is very big. To make it can finish high precision and high reliability of control tasks, in order to can bring convenience to the operator at the same time, we made the following concerns: ( 1) Mechanical parts for the reasonable design of mechanical parts is the controlled object control system, control system is the premise of reliable work. We have adopted a suitable interference fit of worm gear and worm drive structure, offers high precision rotary table and self-locking conditions. ( 2) Constitute a good man-machine interface touch screen man-machine interface from the picture, tips statement, color gives a person with relaxed, the striking feeling; The control of the frame design is based on the centralized control functions for the principle, easy operation; Touch screen shows various setting parameters and system running status, operator is easy to understand the status of the system, operation is convenient.
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