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  • The development trend of CNC machine tool technology
    Time: 2017-04-25 17:10:27Copyfrom: Jiangsu Shengong Jingji machinery Co.,Ltd

          In order to meet the needs of the market and the development of science and technology, in order to achieve the modern manufacturing technology of numerical control technology is put forward higher request, at present, the development trend of numerical control technology and equipment mainly embodied in the following aspects:


          (1) high speed, high efficiency, high accuracy and high reliability


          To improve the efficiency of processing, the cutting and feed speed must be raised first, and the processing time should be shortened.In order to ensure the quality of processing, the accuracy of the movement trajectory of the machine parts must be improved, and the reliability is the basic guarantee of the above target.To do this, there must be a high performance numerical control device.


          Fast and efficient To develop in the direction of high speed machine tool, can give full play to the performance of modern cutting tool material, not only can greatly improve the machining efficiency, reduce processing costs, but also can improve the surface quality and machining precision of parts.Ultra-high speed processing technology has wide applicability to high efficiency, high quality and low cost production in manufacturing.


          The new CNC machine tool (including machining center) can further improve its productivity only by using high speed to shorten cutting hours.Ultra-high speed machining, especially ultra-high speed milling, is closely related to the development of new generation of high-speed CNC machine tools, especially high-speed machining centers.Since the 1990s, countries in Europe, the United States and Japan have been scrambling to develop new generation of high-speed CNC machine tools to accelerate the development of machine tools.High-speed spindle unit, motorized spindle rotational speed (15000-100000 r/min), high speed and high speed plus/minus the feed movement of parts (fast moving speed of 60 ~ 120 m/min, cutting feed rate is as high as 60 m/min), high performance CNC and servo system and nc tool system is a new breakthrough, reached a new technical level.With ultra high speed cutting mechanism, hard abrasive resistant long life of cutting tool materials and abrasive abrasive, high power high speed motorized spindle, high speed feed unit driven by linear motor plus/minus and high-performance control system (including monitoring and control system) and protective device and a series of the solution of the key technologies in technical areas, should lose no time in development and application of a new generation of high speed nc machine tools.

          The rapid and accurate digital transmission technology for the high performance machine tool execution parts with high precision, high response speed, real-time processing of the adoption of new type cutting tools, turning and milling cutting speed has reached more than 5000 m ~ 5000 m/min;The number of spindle turns is over 30,000 RPM (up to 100, 000 revolutions per minute);Workbench movement speed: (feeding speed), at a resolution of 1 micron, in the 100 m/min (some to over 200 m/min), the resolution of 0.1 micrometers, in more than 24 m/min;The automatic knife changing speed is within 1 second;The small segment is inserted into the speed of 12 meters per minute.According to the requirements of high efficiency, mass production and the rapid development of electrical drive technology, the application of the linear motor, developed a batch of high speed and high speed response of nc machine tool efficiently and to meet the needs of automobile, agricultural machinery and other industries.As the new product upgrade cycle speed up, the processing parts of die, aviation, military and other industries are not only complicated but also the variety of varieties.


          Low and high precision From precision processing to ultra-precision processing, it is the direction of development of the world's industrial powers.Its accuracy ranges from micron to submicron and nano-scale (< 10nm).Ultra-precision machining mainly includes the ultra-precision cutting (vehicles, milling), super precision grinding and super precision grinding and polishing and super precision special processing (three beams with fine processing and micro electrical discharge machining, electrochemical machining and various composite processing, etc.).With the development of modern science and technology, new requirements have been put forward for ultra-precision processing technology.The emergence of new materials and new components, such as higher accuracy requirement put forward need to be super precision processing technology, development of new type of ultra precision machine tools, improve the modern ultra-precision machining technology, so as to adapt to the development of modern science and technology.


          At present, the requirements for machining precision are as follows: the average machining accuracy has doubled, to 5 microns;Precision machining accuracy increased two orders of magnitude, the ultra precision machining into the nanoscale precision (0.001 microns), the accuracy of spindle is 0.01 ~ 0.05 microns, machining roundness 0.1 microns, processing surface roughness Ra = 0.003 microns.


          Motors is in order to meet the needs of the development of high and new technology, but also to improve the performance of common mechanical and electrical products, quality and reliability, reduce its assembly work and to improve the efficiency of assembly needs.With the development of high and new technology and the improvement of the performance and quality of mechanical and electronic products, the demand of machine tool users for machining precision of machine tool is getting higher and higher.In order to meet the needs of users, nearly 10 years, common to the machining accuracy of nc machine tool is not the + 10 microns to + / - 5 microns, level precision machining accuracy of machining center is from plus or minus 3 ~ 5 microns, increase to + / - 1 ~ 1.5 microns.


          High reliability Is index of the reliability of the control system is higher than the reliability of the control equipment in more than one order of magnitude, but it is not the higher reliability, the better, is still a reasonably reliable, because it is a commodity, of the price performance ratio.For unmanned factory work two shifts a day, and if required within 16 hours of continuous work, no failure rate P (t) = 99%, the average trouble-free operation time MTBF of the nc machine tool is must be greater than 3000 hours.MTBF is more than 3000 hours, for composed of different number of nc machine tools no one chemical plant difference mostly, we just for a CNC machine tools, such as the host and the ratio of the numerical control system failure rate of 10:1 (nc reliable) an order of magnitude higher than the host.The MTBF of the numerical control system is greater than 33333.3 hours, and the MTBF, which has numerical controls, mainshafts and drivers, must be more than 100,000 hours.


          Currently, the MTBF value of the foreign numerical control device is more than 6000 hours, and the driving device reaches more than 30,000 hours.


          (2) modularity, intelligence, flexibility and integration


          Modularity, specialization and personalization The machine tool structure modularity, the numerical control function is specialized, the machine tool performance ratio is greatly improved and the optimization is accelerated.In order to adapt to the characteristics of the nc machine tool many varieties, small batch, modular machine tool structure and CNC functional specialization, significantly higher price performance ratio and speed up the optimization of machine tool.Personalization is a particularly significant trend in recent years.



          Low intelligence Smart content includes all aspects of the digital control system:


          A.To be intelligent in the pursuit of processing efficiency and processing quality, such as adaptive control, process parameters automatically generated;


          B. to improve the driving performance and the use of intelligent connection is convenient, such as feedforward control, motor parameter adaptive computing, automatic identification model of load automatically selected, self-tuning, etc;


          C. Simplified programming, simplifying operational intelligence, such as intelligent automatic programming, intelligent computer interface, etc.


          D. intelligent diagnosis, intelligent monitoring, convenient system diagnosis and maintenance.


          Flexibility and integration Nc machine tools to the flexible automation system is the trend of development: from the point (CNC single machine, machining center and nc machine tools), line (FMC, FMS, FTL, FML) to the surface (section workshop independent manufacturing island, FA), body (CIMS, distributed network integrated manufacturing system) in the direction of development, on the other hand to pay attention to the applicability and economy development.Flexible automation technology is the manufacturing industry to adapt to the dynamic market demand and product quickly update the main means, is the mainstream trend of manufacturing development, is the foundation of advanced manufacturing technology.The emphasis is on improving the reliability and practicality of the system to facilitate networking and integration.Focus on strengthening the development and improvement of the unit technology;CNC single machine for high accuracy, high speed and high flexibility.The CNC machine and its forming flexible manufacturing system can easily be connected with CAD, CAM, CAPP, MTS, and to the information integration.Network systems evolve toward openness, integration, and intelligence.


          (3) openness


          In order to adapt to the numerical control into line, connected to the Internet, affordable, many varieties, small batch, flexible and personalized CNC rapid development request, is the most important trend of the development of the openness of the system structure, design and manufacture of open CNC system, such as the United States, the European Union and Japan's development of open numerical control program, etc.


          (4) there is a new generation of CNC processing technology and equipment


          A. in order to adapt to the development of manufacturing automation, to provide FMC, FMS and CIMS based equipment, digital control system can not only complete the usual processing function, but also has the automatic measurement, automatic feeding, automatic tool change, up and down automatically replace the spindle head (sometimes with coordinate transformation), automatic error compensation, automatic diagnosis, into the line and connected to the Internet, and other functions, widely used robots, logistics system;


          B. FMC, FMS web-based manufacturing and non-drawing manufacturing technology;


          C. on numerical control technology, manufacturing process technology in rapid prototyping, parallel machine tools, machine humanization, multifunction machine and machine aspects, such as high speed motorized spindle, linear motor unit and precision of software compensation technology has been a breakthrough.The new nc machine tool of parallel bar system is practical.This kind of virtual shaft nc machine tool USES the complexity of the software to replace the complexity of the traditional machine tool, and opens up new areas of nc machine tool development.


          D. computer aided management and engineering database, Internet and other manufacturing information support technology and intelligent decision-making system.The large amount of information stored and processed in the machine processing.The application of digital network technology enables the mechanical processing of the whole system to be rationally and efficiently.


          Due to the use of neural network control technology, fuzzy control technology, digital network technology, mechanical processing to the virtual manufacturing direction.

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