NEW DEVELOPMENTS IN HIGH SPEED MACHINING TECHNOLOGY

摘要

The worldwide market for milling and drilling machines is shown in Figure 1. Today the machining center market constitutes at least 60% of the total market, the remainder being taken up by special purpose & transfer machines for large volume manufacturing and by milling and drilling machines for small batch and one-off manufacturing. Within this market are high speed machining centers used in small, medium and large batch production. High speed machining centers for large batch manufacturing are mainly in the automotive field and may be more strictly called high speed positioning machines. The aim is to be able to move from point A to point B in the shortest possible time. The machines typically are horizontal machining centers with linear motor drives which offer rapid traverse rates of 100～120 m/min and accelerations of 2 to 3g. Linear motors with their high feedrates and accelerations offer the benefits of higher productivity which outweigh the drawbacks of higher energy consumption, higher heat generation and a higher cost of up to 30% compared to their ballscrew counterparts.