This study implements a high-precision camshaft profile grinding system by retrofitting the C-axis and X-axis structures of an existing cylindrical grinding machine and integrating CNC variable monitoring and control functions based on the manufacturer-provided Programming Package. The original inverter-driven C-axis was replaced with a servo motor to enable precise angular positioning, while a linear scale was additionally applied to the X-axis to establish a closed-loop system capable of high-precision infeed control. Changes in the grinding wheel diameter due to dressing are compensated by real-time monitoring of internal CNC variables, enabling regeneration of the profile grinding program to prevent degradation of form accuracy. Perfomance evaluation showed that the camshaft profile accuracy was maintained within ±4 μm, and the consistency of the profile was sustained within ±2.5 μm over repeated grinding cycles. This study presents a practical technological foundation for converting cylindrical grinding machines into profile grinders capable of precision machining of non-circular components such as camshafts.

This study aims to evaluate the effectiveness of adding CNC parameter monitoring functionality using OPC UA to the existing HMI for CNC grinding machines, specifically focusing on maintaining machining precision for ferrous materials despite changes in grinding wheel diameter post-dressing. Three workpieces, each ground with different wheel diameters (WD162.24, WD162.22, WD162.20), were subjected to profile error measurements at various angles within a ±4.0μm tolerance range. The elliptical shape of the workpieces required diameter measurements across a 90-degree section. Results indicated that, despite slight deviations, all workpieces remained within the specified tolerance range, demonstrating that the OPC UA-based monitoring system effectively maintains machining precision after wheel dressing. This suggests significant potential for improving grinding processes for ferrous materials using OPC UA-integrated CNC systems.

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