The Application of PLC-controlled Stepper Motors in Milling Machines for Agricultural Vehicles Song Jian Yuan Chi 2, Du Guochen 2, Sun Xueyan 2 (1. China Agricultural University, Beijing 100083, China; 2. Weifang University, Weifang 261IM1, Shandong Province) China is a machine tool Big country, with more than 3 million ordinary machine tools and a large number of special machine tools, the number of the world's forefront. However, most of them use relay contactor control, equipment is backward, old technology, manual operation, low efficiency and poor quality. The use of advanced control technology to transform existing old equipment to varying degrees is an important way to improve China's manufacturing level. To this end, the author of the agricultural vehicle clutch teeth milling machine transformation, retained the basic part of the original machine tool, the use of PLC and stepper motor control system has been transformed. 1 The problem is presented as a sketch of parts of a dog clutch body. The number of teeth of such a triangular-toothed clutch body is various, such as 30, 45, 60, and 75, according to different use requirements. The original has been using horizontal milling machines, using indexing head processing. During processing, the worker cranks the handle of the longitudinal table and mills one tooth, which is then indexed by a manual indexing head. Repeat this until all teeth are milled. With this method of processing, an error in the indexing will cause the entire part to be scrapped, and the efficiency is low, and the workers are nervous and labor-intensive. For this reason, it was decided to transform it to automate the entire process. When working, press the automatic processing switch: Longitudinal table fast-forward work feed a rewind a graduated head index until the processing is completed. For the overall structure diagram. 1. Milling cutter 2. Indexing head 3. Stepping motor 4. Longitudinal workbench Stepping electric feeder 5. Lifting table The overall structure of the machine tool Simple overall design plan The entire transformation work was performed on the original X62W milling machine. In order to improve the reliability and flexibility of the control system and reduce the workload of system design, the control system uses PLC control. The stepping motor is installed on the hand-shaft of the original indexing head and is automatically controlled by the PLC. According to the needs of the processing process, the feed motion only retains the longitudinal movement. The original mechanical transmission chain is used to send the control signal from the limit switch. The PLC control realizes the automatic processing. 3 stepping motor selection and control According to the processing requirements of the indexing, comprehensive consideration of the performance of the stepper motor, select the five-phase ten 90BC536 stepper motor. Because the gear ratio of the indexing head is > 40, that is, the indexing head handle rotates 1 turn, and the indexing head spindle rotates 1/40 turns. Therefore, it can be converted that a tooth should be input to the stepping motor because the PLC has a better real-time refresh function, can generate a pulse signal with a certain frequency, and PLC has a high-power transistor output interface to meet the stepper motor Winding voltage and current requirements. In order to reduce the workload of system design and improve reliability, PLC control system is selected. The angular displacement of the stepper motor is proportional to the number of input pulses; the rotation speed is proportional to the pulse frequency; the direction of rotation is related to the phase sequence of the pulses distributed to the phase windings of the stepper motor. The use of PLC to generate a certain period of control pulses, shift register shift, resulting in ten beat timing, through the five-phase ten-shot circular distributor to make five output relays by single and double ten shot energized way to turn on, work-in Brake retreat and rewind spindle motor emergency stop work table fast retreat overload protection work table. Overload Protection Workbench Fast Forward Overload Protection Stepper Motor Winding A Phase Cooling Pump Start Stepper Motor Winding B Phase Auto/Adjust Stepping Motor Winding C Phase Forward Brake Stepper Motor Winding D Reverse Brake Stepping Motor Winding E Phase table in-situ adjustment instructions Work-in-process switch automatic indication 5 PLC control system programming PLC control connection diagram According to the control requirements of the machine tool processing process, according to the step-by-step motor winding power sequence, analyze the relationship between the input output, Design PLC control program. For the overall structure of the program, it consists of three program segments: common program, manual adjustment program, and automatic machining program. The common program sets the status indication, spindle start brake, shift jog, cooling pump start, and inhibit output. Manual operation does not require any complicated sequence control. The normal track relay circuit design method can be used to program basic logic instructions. 6 Concluding remarks After the PLC machine controlled the automation of the stepper motor, the production efficiency was improved, and the labor intensity and reject rate of the workers were reduced. In particular, under the condition of not changing the structure of the original machine tool, PLC is used to directly control the stepping motor, which is simple and reliable, less investment, and reduces the work experience of the system design, greatly shortens the development cycle, and has high promotion and practicality. value. 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