Mitsui Seiki's jig milling/boring accurate machining center
Mitsui Seiki’s PJ812 VMC travels X-1200mm, Y-800mm, Z-500mm. Max work size is 1200mm x 800mm x 450mm. Table load accommodates 1500kg. The VMC provides positioning accuracy and repeatability of +/- 1µm. A thermal compensation system employs sensors on the machine faceplate and inside the spindle to minimize 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%. Cooling systems for slide way lubrication and ball screw cores stabilize axis feed precision.
Mechanical design features maximize machine rigidity and accuracy including hardened and ground tool steel box slideways as well as contact elements that enhance acceleration, reduce stick-slip, and allow for feed accuracy of 0.1 µm. Another proprietary engineering detail drastically improves the static rigidity of the Z-axis to more than six times that of conventional Z-axis arrangements.
The ultra-precision machine allows more complete machining of precision components including precision boring, milling, drilling, and tapping. Machining center technology and jig borer precision in one machine. The machine features a full enclosure and various coolant system options. The model at the show will have a 690-liter cooling tank, a 40-tool ATC, and the advanced Fanuc F31i-B5 control with the i-H Pro panel.