The present invention relates to the technical field of automatic
machine tools, and particularly to a dual-spindle
machining center for a large-scale workpiece. The central architecture of the present invention comprises two opposing bases, two pillars respectively being provided on each of the two bases; cross beams are mounted the pillars on the same sides of the two opposing bases to form two, i.e. a front and a rear gantry structure; a three-axis mechanism is provided on the central architecture, and is provided with a spindle head which can move in X, Y and Z axial directions; additional Y-axis mechanisms are each provided on the inner sides of the lower parts of the two pillars of the same base, and are provided with a fixture; two chain-type tool
magazine and tool lifting device kits are symmetrically provided beside the pillars on the tops of the two bases; two ATC tool changing manipulators are symmetrically provided on tool
magazine supports on the two bases. The technical solution of the present invention solves the problems in the prior art that using gantry apparatuses to
machine large-scale workpieces has difficulty in
machining multiple sides by means of positioning one time, requires a long time to change tools, and requires spindles to lead in tools.