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Mitsui Seiki introduces new series of VMCs

Posted on 23 Sep 2020 and read 464 times
Mitsui Seiki introduces new series of VMCsMitsui Seiki, which is represented in the UK by Market Harborough-based Kyal Machine Tools Ltd, has launched a new series of CNC vertical machining centres.

Called the ‘J series’ (for Jig), they have been designed for machining medical, optical, mould and die, and aerospace parts.

These machines provide a positioning accuracy and repeatability of ±1µm and incorporate a thermal compensation system with sensors on the machine faceplate and inside the spindle to minimise the effects of temperature changes on part accuracy and cut temperature-generated displacement by 60%.

This system also reduces Z-axis thermal growth and deflection by 30%, while cooling systems for slideway lubrication and ball screw cores stabilise axis-feed precision.

Meanwhile, mechanical design features that maximise machine rigidity and accuracy include hardened and ground box slideways, as well as ‘contact elements’ that enhance acceleration and reduce stick-slip.

Furthermore, the Z-axis has been engineered to offer a level of static rigidity that is six-times greater than that of a conventional Z-axis arrangement.

There are four basic machines in this new series: the PJ812 (PJ for Profile Jig) has a work envelope of 1,200 x 800 x 500mm, a maximum workpiece size 1,200 x 800mm, a table load of 1,500kg, spindle speeds from 10,000 to 30,000rev/min and ATC capacities of 60, 90 or 120 tools; the J1220 has a work envelope of 2,000 x 1,250mm x 500mm, a maximum table load of 3,000kg and spindle speeds from 10,000 to 15,000rev/min; the J1230 has a similar specification but a larger X axis (3,000mm), while the J1625 has a work envelope of 2,500 x 1,600 x 500mm and a maximum table load of 6,500kg.

All of the machines feature a full enclosure and various coolant system options.