Current situation and main CNC systems of the hott

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The current situation of CNC surface grinder and its main CNC system

compared with lathes, milling machines, etc., surface grinder adopts CNC system later, because of its special requirements for CNC system. In recent ten years, with the help of CNC technology, the continuous dressing of grinding wheels on grinding machines, automatic compensation, automatic exchange of grinding wheels, multiple worktables, automatic transmission and clamping of workpieces and other operating functions have been realized, and numerical control technology has been gradually popularized on surface grinding machines. In recent years, at large machine tool exhibitions in Hannover, Tokyo, Chicago, and China, CNC grinding machines have accounted for the majority of the whole grinding machine exhibition. Famous grinding machine manufacturers such as German Blohm company and ELB company no longer produce ordinary grinding machines. Japanese companies such as Okamoto and Nikko also produce full-function CNC flat grinding in batches. While developing high-grade CNC flat grinding, they actively develop medium and low-grade CNC flat grinding

the brilliant series two-axis CNC forming grinding machine produced by German ELB company a few years ago, its vertical and horizontal are CNC axes, and its longitudinal is hydraulically controlled. The grinding wheel dressing adopts diamond rollers installed on the workbench, which has a wide range of applications; Super-brilliant series is a three-dimensional CNC plane and forming grinder. The bed is made of natural granite, with high geometric accuracy. The guide rail is a linear rolling guide rail, which is mechanically driven without recoil, so as to ensure that the workpiece has a good surface finish; Brilliant-future is the improved product of the above two series. The bed is made of artificial granite, and the longitudinal is made of static pressure guide rail, toothed belt transmission. The vertical and horizontal guide rails are preloaded linear rolling guide rail, ball screw transmission, three-axis CNC controlled AC servo motor, 0.5 μ M. At the same time, ELB company has developed grinding machine products with the latest contemporary technology, that is, cam-master series flexible grinding processing units based on electromechanical integration and computer technology, cad-master series and compact should be stopped for inspection; In case of failure during operation, it is necessary to check the t-master series grinding machining center, and the control shaft can reach 24 shafts at most. In addition, due to the full implementation of modular design, the manufacturing cycle of special grinding machines is shortened. ELB company has also developed a variety of high-efficiency special grinding machines, such as sfvg100/2 special grinding machines, which have the functions of tilting grinding head, continuous trimming, jogging, oblique cutting grinding, and 11 CNC control shafts, Like a grinding center. British jones&shipman company and American A-B company have developed a-b8600 numerical control system for format5 numerical control flat grinding. The hydraulic valve is controlled by CNC to drive the longitudinal adjustable speed movement, the ball screw pair is used for horizontal and grinding head feeding, the DC servo motor is driven, the intermittent grinding wheel dressing, and the CRT graphic simulation display. At the same time, it can also be equipped with other types of CNC systems to meet the requirements of different users

at present, with the continuous improvement of semiconductor integration, the newly launched system is getting smaller and smaller in appearance, more and more compact in structure, and remote communication is added in function. 2. What backup data diagnosis must be done for mobile phone software reinstallation, multi machine connection, etc; The operation interface is close to the windows system, and the mouse, remote controller and other operation parts are added. Fanuc mainly launched 18i, 16i, 20i and 21i systems this year. Siemens 840D, 810D and 802D are all compact systems. Another profit structure has been significantly improved. Some manufacturers, such as the pa8000nt series CNC controller developed by Taiwan precision machinery research and development center, use the windows NC operating system and NT real-time multiplex processing core. The processing speed of a single section of program is up to 2000 blocks/s, and the number of pre reading processing of a single section is up to 1000 blocks. It has AART (pre adaptation adjustment technology) and parameter optimization learning functions, which can make the following error close to zero, The software machining path filter can reduce the mechanical resonance caused by the excessive change of acceleration in the cutting process, so as to improve the surface roughness; Flexible servo, with +, -10v analog servo interface, and international standard SERCOS digital servo communication interface; PLC program design has five Grammars: ladder diagram, structure statement, function block, instruction code and flow chart, which are convenient for design, communication and maintenance; It has the functions of computer remote communication and instant remote maintenance; The control axis and spindle can be extended to 64 axes at most, and the i/o points can be extended to 792/528 points. Pentium processor is adopted, and the processing speed of high-speed PLC reaches 25K

in the world, in addition to the famous professional CNC systems factories such as Siemens and Fanuc, which have developed and produced many systems suitable for surface or forming grinding, some flat grinding factories themselves have actively developed CNC systems suitable for their grinding machines. It mainly includes:

Siemens' SINUMERIK 840D system, which has more than 20 servo axes, coordinate continuous stroke control, manual data input or input through external computer, remote diagnosis, travel can be changed with the reduction of wheel diameter, automatic compensation of wheel dressing amount, ball screw clearance error compensation, etc

Siemens 3G system is specially developed for grinding. It is equipped with an operation prompt device for man-machine dialogue. When the axis is tilted, it can also carry out straight-line and arc interpolation. The operation cycle that often occurs in grinding, such as spindle swing, interrupt the execution program with external signals, cut in the grinding wheel, dressing the grinding wheel and other special preparation functions, compile the fixed cycle program. It can not only use the external measuring device (switch signal), but also directly control the device to compare with the final size when a suitable measuring head is connected

8400cnc and 8600cnc numerical control series produced by American alley-brandly company are suitable for lathes, milling machines and grinders. Its 8400cnc can control up to 6 servo axes. Any 2 axes can be used for arc interpolation, any 3 axes can be used for spiral interpolation, and 6 axes can be used for linear interpolation. 8600cnc series can control up to 17 coordinates, including 8 participating interpolation axes, 8 bit control axes and 1 spindle. It has the functions of graphic display, expanding branch program, displaying processing time, high-speed program verification, tool life monitoring, etc

FANUC company of Japan has developed og high-speed and high-performance numerical control system, in which o-gsg is suitable for surface grinding machines. According to different shapes of grinding parts, there are four different grinding methods. It has the function of grinding wheel axis angle tilt control, a whole set of grinding cycles of raw grinding, rough grinding, fine grinding and non sparking grinding, the function of position compensation after grinding wheel rolling and dressing, and the function of dresser relative to the normal direction of the wheel being dressed, The compensation function of the arc radius of the outer edge of the dressing roller, the graphic display function of the grinding wheel shape and the display of grinding parameters, etc., and the minimum setting unit of the system is 0.1 μ m. It is a "compact" CNC system with low price

in addition, there is UNICON system jointly developed by German ELB company and universities. The osp5000g-g, osp30-nf and other self-developed CNC systems for plane and forming grinding of Okuma iron Institute in Japan can control up to 9 inflatable seat marks with avant-garde design and unique style, of which 6 coordinates can be linked, with 12 inch color display, man-machine dialogue programming, automatic determination of cutting coefficient, floppy disk input can be used, and incorporated into FMS system. The minimum pulse equivalent, moving equivalent and detection equivalent are 0.1 μ m. The full closed-loop mode of inductosyn is also adopted in the flat grinding

although other flat grinding manufacturers use the system of the CNC host factory, they develop their own software, which is more suitable for surface and forming grinding. For example, German Jung company, based on Siemens SINUMERIK 810, adopts the company's special software, uses Jung kontur programming language to form and repair the grinding wheel, and has the function of graphic auxiliary operation. Okamoto company of Japan has developed OPL language on the CNC system hardware of FANUC company for grinding, etc

nowadays, the increasing development of linear motor, dynamic balance and other technologies and processes has greatly improved the efficiency of machine tools. The application of appropriate measurement technology to the development and utilization of numerical control system enhances the electrical automatic control function of machine tools. (end)

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