Horizontal machine tool
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United States of America Patent
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Jun 16, 2015
Grant Date -
Oct 10, 2013
app pub date -
Dec 8, 2011
filing date -
Dec 24, 2010
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Abstract
Provided is a horizontal machine tool which achieves remarkable accuracy improvement by correcting spatial accuracy while stabilizing the swing of a main spindle. To this end, a horizontal machine tool (10) is provided with: a ram tension bar (20) which corrects the deflection of a ram (17); a lifting force correction mechanism (30) which corrects the inclination of a saddle (16) by adjusting lifting force at two positions where the saddle (16) is lifted; a column tension bar (40) which corrects the bend of a column (14); and a control device which controls the ram tension bar (20), the lifting force correction mechanism (30) and the column tension bar (40) and has a spatial accuracy correction function of correcting the spatial accuracy by numerical control. The control device corrects only the swing of the tip of a main spindle (18) using the ram tension bar (20), the lifting force correction mechanism (30) and the column tension bar (40), and corrects the deterioration of the spatial accuracy due to sinking of a bed (11) using the spatial accuracy correction function.
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