PLC application in the pipe bending machine

This paper introduces the use of PLC on the pipe bending machine. PLC floating point number and function of trigonometric function plays an important role in the device's control. Key words: pipe bending machine; PLC； One, the introduction of tube structure with high strength, good rigidity, save material and the characteristics of beautiful shape, the forming machining is also very good, so all kinds of metal tubing is given priority to the hollow section profiles are widely used in aerospace, automobile, petrochemical, furniture, transportation industry, etc. Tube bending is through the local deformation to produce continuous deformation of the whole pipe molding method. Many different kinds of tube bending method, according to the molding methods can be divided into roll bending, bending and bending die three; According to the bending, the whether the heat can be divided into cold bending and hot bending; When press bending without mandrel can be divided into core pipe bending and no core pipe bending. In recent years has also created a zero radius steel tube bending, heat stress bending and laser bending such as new pipe bending technique. With the development of economy and the improvement of processing technology, all walks of life rapidly growing demand for various types of bend, the pipe bending forming quality and precision of the tube type machining efficiency is higher and higher demands are proposed. Bend method from the original manual bending into now nc equipment automatic pipe bending, pipe quality and production efficiency have been greatly improved. Second, the project profile, 2. Introduction to industry this year, China's machine tool industry product structure level of continued ascension, will markedly enhance its capability of technological innovation, but when you see these achievements at the same time, a series of problems which restrict the development of the industry followed. Our pipe industry needs to promote development and progress, pipe bender hydraulic pipe bending machine, automatic pipe bending machine, CNC pipe bending machine, cutting machine, shrink machine, metal circular saw machine, more needs to be deepened and technology development in the industry. 2. 2 customer requirements in the parameter setting module to achieve the following functions: 1, provide the XYZ and YBC two coordinate ways of tubular parameter input, display, edit, and conversion function. 2, the reasonable organization of all kinds of parameters, provide a simple and convenient parameter input the man-machine interface. Examination, processing property of input parameters as input parameters of illegal tip as a warning. 3, calculated by the tubular parameters automatically, pipe length and the required length of pipe material processing. 4, can input under 14 bending and bending time limit tube 5, and other functions such as data save and load parameters. 2. Three solutions of pipe bender control by PLC, controlled by PLC output point electromagnetic valve to control the oil cylinder, indirect control oil system, drive actuator movement. High-speed pulse output control servo drive action. 2. 4 the solution context convenient PLC ladder diagram programming instructions, greatly improving the efficiency of programming, strengthened the readability of the program. Favored by the majority of small and medium-sized PLC users. For the commonly used two 3 way solenoid valve, PLC can control output directly through the contact. PLC support high-speed counter input, up to 920 KHZ. PLC controller single can have up to 4 groups hardware high-speed counter and 4 software high speed counter. PLC has the special NC positioning language, single most senior axis high-speed pulse output, the highest frequency of up to 920 KHZ, with multiple spindle with motion and the linear interpolation function. PLC is a powerful communication function, the highest communication rate of up to 921. 6 KHZ, support the Modbus communication protocol, for private use, such as common data communication protocol, the commonly used RS - any configuration And RS - 232 485 communication mouth. PLC are simple set of instructions, can be simple and convenient to complete the PLC host communications with other devices. Three, the design of the control system of 3. 1 the hardware configuration models of FBs - host 40 mct +的边后卫—— Choose the FT - 8 yt, touch screen 070ST- T41R, still need to choose and buy solenoid valve, photoelectric switch, servo motor and other equipment. The following is the equipment control system structure diagram ( As shown in figure 1) 3. Under 2 control process design is the flow chart of the device ( As shown in figure 2) 3. 3 electrical wiring design, the following is the PLC I/O point configuration diagram below is overall control cabinet ( As shown in figure 3) Four, software design, 4, 1, data transformation in the pipe bending machine, the operator input is XYZ data of cartesian coordinate system, motion mechanism to accept data in the control system for pipe bending machine dedicated lm-prb data. XYZ coordinate system with lm-prb relationship as shown in figure. So to simulate the movement of the pipe bending machine, you must first to convert the coordinates calculation. On the pipe bender, P is the linear distance between the two bending, R two bending Angle of the plane, namely B the bending Angle. Every time take four points to calculate in accordance with the order, as shown in figure, the point P1, P 2, P3, the coordinates of the 4 P ( x 1 , y 1, z 1) 、( x 2, y 2 , z 2 ) 、( x 3 , y 3, z3) 、( x 4 , y 4, z4) , bend the normal vector of n 2 P 2, P3 bending normal vector 5 for n3 five, equipment debugging. 1 encoder input debugging in the bent pipe bender, the requirements of the PLC of the encoder value, and comparing to set Angle, immediately interrupted when arrived. （ As shown in figure 4) 5. 2 equipment debugging of the whole through the bending part of debugging, can read to the correct encoder values, will be able to debug whole pipe bending machine. The following is the overall equipment figure ( As shown in figure 5) Six, analysis of the difficulties in the position of the tube in the space is more complex, with a number of points to describe the coordinates of the tubular, people is not easy to suppose the real shape of the tube. Pipe bending machine, the data is not used by the coordinate point data, but the pipe bending machine dedicated lm-prb data. , therefore, are stored in computer memory in the coordinates of the point data must also be through a series of vector operation, calculate the bend pipe bending machine dedicated lm-prb data you need.
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