Quality error analysis of The CNC grinder

Quality error analysis of The CNC grinder from Shenyang HermosCNC Machine Tool Co.,Ltd.

By: Shenyang HermosCNC Machine Tool Co.,Ltd.  10/20/2014
Keywords: CNC double surface grinding machines

"Grinding process is consisted of grinders, jig grinding, which constitutes the entire workpiece processing system. Grinding accuracy depends on the impact of precision grinding quality, which is mainly affected by the principle error, grinding error, jig error, wheel error and several other factors. 1. Principle error Error is due to the principle of the processing movement or contour approximation produced wheel. Exhibition into law by grinding teeth, should develop into a precise movement between the workpiece and the grinding wheel, but the tooth is actually obtained by the approximate involute many short segments, and thus has caused principle error. 2. CNC internal grinder error Error by manufacturing precision CNC internal grinder produced, called grinders error. Where the greatest impact on the processing of spindle rotation accuracy, headstock, tailstock and wheel frame and rails error and other high geometric precision grinder. 3. CNC internal grinder wheel error Wheel errors include error correction wheel and wheel wear and tear caused by errors. Since the contour of the wheel will result in an error corresponding to the error of the workpiece size and shape, it requires a fine grinding wheel dressing and has a certain degree of durability. 4. CNC internal grinder fixture error Manufacturing errors, positioning errors and the wear of the jig during use, will be the first machining accuracy of the workpiece. 5. Process system errors caused by thermal deformation Process systems are grinding heat, friction and heat, solar radiation effects, make the heat conduction. Such as CNC grinding, grinding spindle components, thermal deformation bed rail will cause changes in the relative positions of the components, thus affecting the machining accuracy. The workpiece is deformed mainly by caused by the grinding heat. 6. Force deformation process system Is an elastic system, process system, under the action of the grinding force, gravity, inertial force, the composition aspects of the system will result in an elastic deformation, such as bending deformation of the workpiece during the grinding shaft Xichang like? Meanwhile, the system because each element is deformed at the contact gap or displacement will. Ways to reduce the admissibility of the various parts of the deformation is to reduce the force and improve the process system stiffness. Ways to reduce the admissibility of the various parts of the deformation is to reduce the force and improve the process system stiffness. 7. The CNC internal grinder workpiece deformation stress fade And machining the workpiece in the heat treatment process, uneven shrinkage due to the cooling, the plastic deformation of the metal structure or uneven change and other reasons, the internal stress generated within the workpiece. Existence of internal stress of the workpiece during machining will produce distortion. 8. Measurement error Measurement error, including manufacturing errors gage itself into two parts and methods of measurement error. Testing the accuracy of the workpiece is achieved by the method of measurement, processing of the special attention to improving the accuracy of measurement."

Keywords: CNC double surface grinding machines

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