A study of online measurement and fuzzy control of a wood-planing process

This paper investigates online measurement of a workpiece?s surface roughness by a laser sensor and the fuzzy control of workpiece feed rate during a wood planing process on a CNC machine. The online measurement system consists of a personal computer, an analog to digital (A/D) converter, a laser displacement sensor, and a CNC machine. Under the control of the computer, a laser sensor carries out the signal sampling, the A/D converter converts data, and the computer calculates surface roughness. This system conducts the high-speed online measurement of surface roughness during machining. The experimental system for the fuzzy control of workpiece feed rate consists of an online measurement system and an output power drive board. According to the signal deviation of the workpiece?s surface roughness measured by the laser sensor, the fuzzy controller conducts the reason and decision, provides the control signal, and adjusts the workpiece?s feed rate to guarantee that surface roughness is within the required range. The final results indicate that the resulting surface roughness using online fuzzy control is better than that without online fuzzy control. The 10-point mean roughness parameter was used as the quality index. Douglas-fir (Pseudotsuga menziesii France), a coniferous tree, and beech (Fagus crenata Carr), a broadleaf tree, were the experimental materials.

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