Application of PLC in electrical control of gear processing machine
Unlike many other bearings, Integral Shaft Bearings do not have an inner ring and instead work off of an inner race that is machined directly into the internal shaft. So what exactly makes up an integrated shaft bearing? Product specifications include: Integral Shaft Bearings Integral Shaft Bearings,Integral Shaft Bearing Catalog,Integral Shaft Water Pump Bearings,Precision Integral Shaft Bearing Ningbo Ritbearing Imp & Exp Co.,Ltd. , https://www.nbbearing.de
Application of PLC in Electrical Control of Gear Processing Machine Zheng Zheng 1 Fu Sufang 2 (Plain University, Xinxiang, Henan 453003, China; Henan Vocational and Technical Teachers College, Xinxiang, Henan 453003, China) Application of electrical control in machine tools.
1 The status quo of gear processing machines in China The gear manufacturing industry is a supporting industry subordinate to the mainframe manufacturing industry. It has risen and fallen with the development of the mainframe industry. At present, there are more than a thousand gear production factories in China, with about 300,000 employees, and the annual output value of gear products exceeds 20 billion yuan. 11. The scale and number of employees in the gear manufacturing industry are among the highest in the world.
There are currently 9 gear machine tool factories in China, with an annual output of about 1,500 gear machine tools such as gear hobbing machine, gear shaping machine, gear grinding machine, internal twisting machine and bevel gear milling machine. From the number of gears in China, it is second only to Germany. In the country of machine tool production, the localization rate of gear machine tools has reached 94%. However, gear machines with a service age of more than 20 years account for 53%, and the numerical control rate of machine tools is extremely low (only 1%). A variety of high-performance gear and gear processing equipment, from 1990 to 2000, the annual average import value of numerical control equipment reached more than 2 million US dollars. 1, becoming the world's largest gear manufacturing enterprise, the largest industry, the largest imported equipment, However, the country's production efficiency, per capita output value, manufacturing process level, product quality is very low. Therefore, the update task of gear machine tools in China is very urgent and arduous. Actively develop new CNC products for small and medium-sized gear machine tools, and carry out numerical control transformation of existing equipment is the future direction of China Gear Machine Tool Factory.
2 PLC control system and relay control system comparison relay control system has played an irreplaceable role in traditional industrial production. With the gradual expansion of production scale and fierce competition in the market economy, relay control systems have become increasingly difficult to adapt to the needs of products. Because the relay control circuit is usually designed for a fixed sequence of operations or production process, its control functions are limited to simple control such as logic control, timing, and counting. Once the sequence of actions or production processes change, it must be redesigned, routed, assembled, and commissioned. Obviously, such a control system cannot fully meet the needs of the ever-changing and highly competitive market economy. This forced people to abandon the already dominant relay control and replace it with a new control system.
PLC (programmable controller) is a new type of universal automatic control device that integrates computer technology, automatic control technology and communication technology. It is designed for industrial environment and is an industrial control computer. It uses a type of programmable memory for its internal memory program, which performs user-oriented instructions such as logic operations, sequence control, timing, counting, and arithmetic operations, and controls each by digital or analog input and output. Various types of mechanical or production processes 12. And programmable controllers and their associated external equipment are designed in a manner that is easy to integrate with the industrial control system and is easy to expand.
Compared with the relay control system, the PLC control system has the following characteristics: high reliability and strong anti-interference ability. Due to the use of microprocessor as the core and various anti-interference measures, PLC reliability is very high (PLC's average time between failures can reach more than 300,000 hours) and long service life.
The control function is strong and the versatility is good. PLC has functions such as logic judgment, counting, timing, stepping, jump, shifting, memory, four arithmetic and data transmission, which can realize sequential control, logic control, position control and process control. The PLC has various interfaces and it is very convenient to connect with external devices. Since the PLC adopts software programming to realize the control function, when the control requirements are changed and the function of the control system needs to be changed, it is not necessary to change the hardware device of the PLC, and only the software program needs to be adapted accordingly. When the same PLC is used for different control objects, only the input and output devices are different, and the application software is different.
Therefore, PLC has great versatility.
Simple programming, easy to use and maintain. The PLC adopts ladder diagram programming similar to the relay circuit. It is intuitive and easy to understand and is very popular among electrical technicians and electricians. Moreover, PLC has fault detection, self-diagnosis and other functions to detect its own faults and alarm display in time, so that operators can quickly check, judge and troubleshoot. It has strong online programming ability and is very convenient to maintain.
Small size, light weight and low power consumption. The PLC uses a semiconductor integrated circuit that is small in size, light in weight, and low in power consumption, making it easy to fit inside a mechanical device. It can be seen from the above-mentioned series of characteristics of PLC that PLC is an ideal control device for achieving mechatronics. In recent years, it has become more and more widely used in industrial automation, mechatronics, and traditional industrial technology transformation, and has become one of the three pillars of modern industrial control. The use of PLC control system to transform existing gear processing equipment is undoubtedly a good way.
3 Application examples Gear hobbing machine is a widely used equipment in gear processing machine tools, mainly used for hobbing straight and helical gears and worm gears. The YC3180 hobbing machine can process a maximum workpiece diameter of 800mm, a maximum modulus of 10mm, and a minimum number of teeth of 8. This hobbing machine can also use a hard alloy hob to harden the hardened hardness in addition to the full function of the ordinary gear hobbing machine. (50~60HRC) The toothed gear is semi-finished or finished, partially replacing the grinding teeth. For this reason, the main motor power of the machine tool is large, and the rigidity and vibration resistance requirements of the machine tool are also high. Taking the processing of spur gears as an example, the application of PLC in its electrical control system is briefly introduced. 3.1 Selection of PLC model and I/O wiring The PLC produced by Mitsubishi Corporation of Japan is widely used in China's mechanical equipment and industrial control because of its small size, flexible control, and good performance and price ratio. According to the needs of the input and output points of the YC3180 hobbing machine control system, the control system adopts the F1-40MR programmable controller manufactured by Mitsubishi Corporation. Its PLC's I/O devices and I/O assignments and numbers are as shown.
Ladder diagram
• Chrome or stainless steel spindle shaft
• Thorough hardened chrome steel for outer race
• Chrome steel balls
• Steel or nylon cage designs available
• Steel shields closures as well as synthetic rubber, metal encased rubber, and metal encased labyrinth seals
• Soft shaft and engineered specials available
INTEGRAL SHAFT BEARING FEATURES
Due to their design, integral shaft bearings are very compact, allowing for either two rows of balls or a row of balls and a row of rollers. Our bearings are pre-packed with lubricant to ensure a long lifespan and are sealed to resist contamination.