High-speed production unit for machining operations

A production unit for machining operations, comprising means for supporting a piece being machined in a fixed position, and a spindle with a horizontal axis which carries a machining tool and is mounted in a spindle-headstock structure that is displaceable along a horizontal axis (Z) parallel to the axis of the spindle, along a horizontal axis (X) perpendicular to the axis of the spindle, and along a vertical axis (Y),

• said production unit comprising:
• a fixed supporting structure;
• a first slide mounted for sliding on said fixed supporting structure along a first of said three identified axes;
• a second slide mounted for sliding on said first slide along a second of said three identified axes;
• and
• a third slide mounted for sliding on said second slide along a third of said three identified axes, and that is connected to the spindle-headstock structure,
• wherein
• the fixed supporting structure comprises a machine bed and a portal frame connected to the machine bed and comprising two side uprights and a top structure that connects the uprights together;
• said first slide is a cross member mounted for sliding along said vertical axis (Y) between the two uprights of the fixed portal frame;
• said second slide is a carriage mounted for sliding underneath the cross member along said horizontal axis (X) orthogonal to the axis of the spindle;
• and
• said third slide, which is rigidly connected to the spindle-headstock structure, is mounted for sliding underneath said second slide along said horizontal axis (Z) parallel to the axis of the spindle;
• and
• wherein said cross member is provided with a central column having at least one vertically-extending planar side and being rigidly connected to the cross member and extending upwards starting from the cross member, said central column being mounted in a sliding manner through said top structure of the fixed portal frame.