Compared with lathes and milling machines, surface grinders adopt CNC systems later, because of their special requirements for CNC systems. In the past ten years, with the help of CNC technology, operation functions such as continuous dressing of grinding wheels, automatic compensation, automatic grinding wheel exchange, multi-table, automatic transfer and clamping of workpieces on grinding machines have been realized, and numerical control technology has gradually become popular on surface grinding machines.

In recent years, at large machine tool exhibitions in Hannover, Tokyo, Chicago, and China, CNC grinders have accounted for the majority of the entire grinder exhibits. For example, German BLOHM company, ELB company and other grinder manufacturers no longer produce ordinary grinders, and Japan's Okamoto , Nikko and other companies also produce full-featured CNC flat grinding in batches. While developing CNC surface grinding machines, they are actively developing medium and low-grade CNC flat grinding.

A few years ago, the BRILLIANT series two-coordinate CNC forming grinder produced by the German ELB company, its vertical and horizontal axes are CNC axes, and the longitudinal direction is hydraulic control. It is a three-coordinate CNC plane and forming grinding machine. The bed is made of granite with extremely high geometric accuracy. The guide rail is a linear rolling guide, and the mechanical drive has no recoil, so as to ensure the workpiece has a good surface finish; BRILLIANT-FUTURE is the above two A series of improved products, the bed is made of artificial granite, the longitudinal guide is static pressure, the toothed belt drive, the vertical and lateral guides are preloaded linear rolling guides, ball screw drive, three-axis CNC control AC servo motor, 0.5μm measurement resolution. At the same time, ELB has developed grinding machine products with the latest technology, namely CAM-MASTER series flexible grinding units based on electromechanical and computer technology, CAD-MASTER series and C OMPACT-MASTER series grinding and machining centers, control axis* It can reach up to 24 axes. In addition, due to the implementation of modular design, the manufacturing cycle of special grinding machines is shortened. ELB company has also developed a variety of special grinding machines, such as SFVG100/2 special grinding machine, which has tiltable grinding head, continuous dressing, slow feed, The oblique plunge grinding function uses eleven CNC-controlled axes, just like a grinding center. British JONES&SHIPMAN company and American AB company developed A-B8600 CNC system for FORMAT5 type CNC flat grinding, the hydraulic valve is controlled by CNC to drive longitudinal adjustable speed movement, ball screw pair for transverse and grinding head feeding, DC servo motor Drive, intermittent grinding wheel dressing, 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 has increased functions of remote communication, remote diagnosis, multi-machine networking, etc.; the operation interface is close to the WINDOWS system, Add mouse, remote controller and other operating parts. FANUC mainly launched 18I, 16I, 20I and 21I systems this year. SIEMENS 840D, 810D and 802D are all compact systems. There are also some manufacturers such as the PA8000NT series CNC controller developed by the Taiwan Precision Machinery Research and Development Center, which uses the WINDOWS NC operating system and the NT real-time multiplexing core. The number of read processing can reach 1000 pieces, with AART (pre-adaptive adjustment technology) and parameter optimization learning function, which can make the following error close to zero, and the software processing path filter can reduce the impact of excessive acceleration changes during the cutting process. The resulting mechanical resonance can improve the surface roughness; the servo is flexibly equipped with a -10V analog servo interface, and a standard SERCOS digital servo communication interface is provided; the PLC program is designed with ladder diagrams, structural statements, function blocks, instruction codes, Five syntaxes such as flow chart are convenient for design, communication and maintenance; with computer remote communication, instant remote maintenance function; control axis and spindle can be extended to 64 axes at most, I/O points can be extended to 792/528 points, using Pentium Processor, high-speed PLC processing speed up to 25K.

      In addition to the well-known CNC system factories such as SIEMENS, which have developed and produced many systems suitable for surface or profile grinding, some surface grinder manufacturers themselves have also actively developed CNC systems suitable for their grinding machines to produce CNC surface grinders. There are:

Siemens SINUMERIK 840D system, which has more than 20 servo axes, coordinate continuous travel control, manual data input or input through external computer, remote diagnosis, can change the travel with the reduction of the diameter of the grinding wheel, automatic compensation of the dressing amount of the grinding wheel, 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 inclined, linear and circular interpolation can also be performed. The running cycle that often occurs in grinding, such as The spindle swings, the execution program is interrupted by an external signal, the special preparation functions such as grinding wheel cut-in and grinding wheel dressing are used to compile fixed cycle programs. It is not only possible to use an external measuring device (switching signal), but also to directly control the device for comparison with the final dimensions when a suitable measuring head is connected.

   The 8400CNC and 8600CNC CNC series produced by ALLEY-BRANDLY in the United States are suitable for lathes, milling machines and grinding machines. The 8400CNC can control up to 6 servo axes, any 2 axes can be used for circular interpolation, and any 3 axes can be used for helical interpolation. Compensation, 6-axis linear interpolation. 8600CNC series can control up to 17 coordinates, including 8 axes involved in interpolation, 8 axes controlled by digit and 1 spindle, with graphic display, extended branch program, display processing time, high-speed program verification, tool life monitoring and other functions .

  In addition, there is the UNICON system jointly developed by the German ELB company and the university. Japan's Okuma Iron Works OSP5000G-G, OSP30-NF and other self-developed plane and form grinding CNC systems, its OSP5000G-G can control up to 9 coordinates, of which 6 coordinates can be linked, with 12-inch color display, human Machine dialogue programming, automatic determination of cutting coefficient, floppy disk input can be used, incorporated into the FMS system, the minimum pulse equivalent, moving equivalent and detection equivalent are all 0.1μm, and the full closed-loop method of induction synchronizer is also used on the flat grinding.

  Although some flat grinding factories use the system of the CNC host factory, they develop their own software, which is more suitable for plane and forming grinding. The programming language is used to shape and dress the grinding wheel, and it has the function of graphic auxiliary operation. Japan's Okamoto Company developed the OPL language for grinding processing on the CNC system hardware of FANUC Company, and so on.

Today's linear motor, dynamic balance and other technologies and processes are increasingly developed, and the work efficiency of the machine tool has been greatly improved. Appropriate measurement technology is applied to the development and utilization of the numerical control system, and the electrical automatic control function of the machine tool is enhanced.