5軸制御マシニングセンタの旋回軸と直進軸のサーボ特性の違いより生じる誤差と複雑形状の加工性能の考察

概要

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We monitored the influence of the difference of servo characteristics between straight axis and rotating axis on motion error in a circular interpolation motion with a servo guide software and discussed its result under DBB3 expression. Especially, we investigated the influence of feed speed and position loop gain on motion error. As a result, five axis machining center equipped with direct driving (DD) motors at the rotating axes was found to achieve the high accuracy motion because its servo characteristics between straight axis and rotating axis could be tuned almost same. Moreover, we attempted to machine the complex geometry workpices with a five axis machining center to compare the cuting performance by a conventional three axis machining center. As a result, it could be demonstrated that in the case of parts of simpler geometry, both accuracy and productivity were almost the same. On the other hand, for parts of more complex geometry, five-axis machining could produce superior accuracy and productivity.