As a key equipment in steel rolling production lines, the machining accuracy of CNC roll grinders directly determines the quality of the rolls, which in turn affects the dimensional accuracy and surface quality of products such as plates and strips. The precision assurance system is based on the core principle of "error source control", which achieves stable output of rolling mill grinding accuracy through measures such as mechanical structure optimization, precise control of CNC system, and process management.
The core principle of precision assurance stems from the precise suppression of various errors during the grinding process. From the perspective of mechanical transmission, a precision control logic of "dynamic static combination" is adopted: in static state, geometric errors are reduced through structural design, and in dynamic state, operational errors are offset through real-time compensation. As the "brain", the numerical control system achieves precise micro displacement control of the feed mechanism through pulse equivalent control, and forms a closed-loop feedback with detection components such as grating rulers to control position errors within a very small range. At the same time, the principle of parameter matching in grinding technology is essential. By reasonably matching the grinding wheel speed, feed rate, and grinding depth, precision deviation caused by vibration and thermal deformation can be avoided.
Mechanical structure optimization is a fundamental measure for ensuring accuracy. The bed is made of high-strength cast iron and undergoes aging treatment to eliminate deformation caused by internal stress; The guide rail adopts static pressure guide rail or rolling guide rail to reduce the friction coefficient and improve the smoothness of motion. The spindle system adopts an electric spindle integrated design, combined with high-precision angular contact ball bearings, to control the radial runout and axial displacement of the spindle at the micrometer level. The support structure of the grinding wheel frame and the workpiece frame adopts a symmetrical design, which enhances the overall rigidity and reduces deformation caused by grinding force.
The integration of numerical control system and detection technology is the key to improving accuracy. Adopting high-precision CNC system, supporting nanometer level interpolation operation, achieving precise synchronization of feed axis; Configure position detection components such as grating rulers and ball grating rulers to perform real-time detection of the feed axis and workpiece rotation, forming a fully closed-loop control. For grinding thermal deformation, the system has a built-in temperature compensation module that automatically adjusts the feed rate by detecting temperature changes in key areas. Some equipment also integrates online measuring devices to detect the size of the rolling mill in real time and provide feedback for adjustment, achieving the integration of "processing detection compensation".
Process control and maintenance guarantee are the support for stable accuracy. Optimize process parameters such as wheel selection and grinding fluid ratio based on roll material and precision requirements; Establish a regular maintenance system to conduct periodic inspections of guide rail lubrication, spindle accuracy, and calibration of detection components. Through multi-dimensional collaboration of machinery, electrical control, and technology, CNC roll grinders can stably achieve micrometer level machining accuracy, meeting the needs of steel rolling production.