押出し方式壁材製造ライン用コンベアへの予見制御の適用

抄録

Extrusion is a typical production method of siding used as a board for surfacing the outside wall of a building. The raw material is first extruded and then a pattern is put on the surface by a pattern roller. The pre-hardened boards thus produced are subjected to irregular forces caused by speed differences among the roller and three stages of conveyers when the boards are transferred downstream from the pattern roller. These forces damage the appearance of siding and significantly reduce values of products. The speed differences must be kept to a minimum where each conveyer is synchronized to track the pattern roller speed. A preview control is developed in this paper for the tracking control because the pattern roller speed as reference input fluctuates considerably and the conveyers to be controlled have large time delays. It is clarified that 1) the pattern roller speed can be made predictable, 2) the speed variation has a particular frequency, 3) the conveyer's time delays can be compensated by feeding a future roller speed as a reference value to each conveyer, and 4) the reference value can be determined from a Bode diagram of the conveyer.