The Requirements and Development of CNC Grinding Machine for CNC System Control

[Editor's note] The numerical control system is the abbreviation of the digital control system. It performs some or all of the numerical control functions according to the control program stored in the computer memory, and is equipped with a dedicated computer system of the interface circuit and the servo drive device. By using digital commands composed of numbers, words and symbols to realize the motion control of one or more mechanical devices, it usually controls the mechanical quantity and the switching amount such as position, angle and speed.
The unique requirements of the CNC grinding machine industry, the machine tool manufacturer is also actively developing the mechanical part, and put forward unique control requirements for the numerical control system of the grinding machine. There are:
(1) Oblique axis control: When tilting in the axial direction, linear and circular interpolation can also be performed.
(2) Spindle swing: In the running cycle that often occurs during grinding, use the external signal to interrupt the execution of the program, the grinding wheel cutting, the grinding wheel trimming and other special preparation functions, and prepare the fixed cycle program. Not only can it use an external measuring device, but it can also be directly compared to the final size when connecting a suitable measuring head.
(3) Strengthening the fixed grinding method: According to the different shapes of the grinding parts, there are four different grinding methods, with the inclination control function of the grinding wheel shaft angle, a complete set of grinding for rough grinding, coarse grinding, fine grinding and non-sparking grinding. Cycle, wheel dressing compensation function, trimmer control function relative to the normal direction of the wheel being trimmed, trimming wheel outer edge arc radius compensation function, system resolution can be set to 0.1μm, belonging to compact CNC system.
(4) CNC system for plane and profile grinding machine, flexible for axis control expansion; up to 9 coordinates can be controlled, 6 coordinates can be linked, minimum pulse equivalent, moving equivalent and detection equivalent are 0.1μm, flat grinding A full-closed approach to linear position sensors [grating scales, inductive synchronizers] is also used.
(5) The flat grinding manufacturer develops its own software, which is more suitable for plane and shape grinding. For example, JUNG Company of Germany uses the company's special software to form and repair the grinding wheel with JUNG?KONTUR? programming language, and has graphic assisted operation. Features. ?Okamoto Corporation of Japan developed the OPL language for grinding, and so on.
(6) The development of technologies and processes such as linear motors and dynamic balances has greatly improved the ergonomics of machine tools. The application of suitable measuring techniques to the development and utilization of numerical control systems, coordinate CNC forming grinding machines, whose vertical and horizontal directions are CNC axes, longitudinal For hydraulic control, the grinding wheel adopts the diamond roller mounted on the workbench, which has a wide application range; the three-axis CNC plane and the forming grinder, the bed is made of natural granite, the geometric precision is high, the guide rail is linear rolling guide, the mechanical drive is not Backflushing, thus ensuring a good surface finish of the workpiece; improved product, the bed is made of artificial granite, longitudinally driven by static pressure rail, vertical and horizontal rails are preloaded linear rolling guide, ball screw drive, three-axis CNC Control and all-digital AC servo motor with a resolution of 0.5μm. The latest technology of the grinding machine products has developed into a variety of high-efficiency special grinding machines, with tilting grinding head, continuous dressing, and oblique cutting into the grinding function.
At present, with the continuous improvement of semiconductor integration, the newly introduced system is more and more compact in structure, and features high-speed communication, remote diagnosis, multi-machine networking, etc.; the operation interface is simplified, and the system structure is progressing toward compactness. . Fast execution speed, up to 1000 blocks per read-ahead processing, AART (pre-adaptive adjustment technology) and parameter optimization learning function, the following error can be made to approach zero, and the software processing path filter can reduce the cutting process. The mechanical resonance generated by excessive acceleration changes to improve the surface roughness; with digital servo, with +, -10V analog servo interface, PLC programming has ladder diagram, structure statement, function block, instruction code, flow chart, etc. Grammar, easy to design and maintain; with computer remote communication, instant remote maintenance.
For the provider of the CNC system, it adopts a flexible and open mechanism to meet the needs of the industry to the greatest extent, and integrates various technical applications to enhance the automatic control function of the machine tool. At the same time, it is also the development direction of Zhongda CNC in the grinding machine industry. Modern manufacturing is progressing from reducing labor costs and product costs, improving the overall efficiency and quality of the company, to fully satisfying customer requirements and actively developing new products. Knowledge-technology--the product upgrade cycle is getting shorter and shorter, the product batch is getting smaller and smaller, the quality and performance requirements are higher, and the society's awareness of environmental protection and green manufacturing is continuously strengthened. Therefore, agile and advanced manufacturing technology will become an important way for enterprises to win competition. The combination of computer information technology and manufacturing automation technology is becoming more and more close, and the proportion of CNC machine tools, which are an important basis for automated flexible production, will increase in production machines.
The surface grinder is relatively late with the numerical control system compared to the lathe, milling machine, etc., because of its special requirements for the numerical control system. In the past ten years, with the help of CNC technology, the continuous dressing of the grinding wheel on the grinding machine, automatic compensation, automatic exchange of grinding wheels, multiple worktables, automatic transfer and clamping of workpieces and other operational functions have been realized, and numerical control technology has been gradually popularized on surface grinders. Recently, at the domestic large-scale machine tool exhibition, CNC grinding machines have occupied the majority of the whole grinding machine exhibits. The full-function CNC flat grinding has become the mainstream. At the same time of developing high-grade CNC flat grinding, it has begun to actively develop medium and low-grade CNC flat grinding.

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