US 2024/0198470 A1 · APPARATUS FOR COOLING AND LOAD-COMPENSATING RAM SPINDLE AND MACHINE TOOL INCLUDING SAME

Abstract

The present disclosure relates to an apparatus for cooling a ram spindle and compensating for a load and a machine tool including the same, in which a cooling unit cools a friction part between a ram spindle and a saddle when the ram spindle, which is transferred by means of the box guideway, is thermally deformed, and a hydraulic pressure closed circuit automatically compensates for a load applied to a plurality of gibs, which is provided inside the saddle and installed between the saddle and the ram spindle, except for a reference surface with which the ram spindle is in close contact, so as to correspond to the reference surface in a horizontal direction or a vertical direction in case that a load applied to the gib is changed by thermal deformation of the ram spindle even though the cooling unit is used, such that the surface pressure applied to the gib is automatically and constantly maintained, which makes it possible to improve machining precision of the machine tool, reduce machining costs by preventing a waste of resources, improve productivity by increasing a non-machining time, and improve stability and reliability of the machine tool.

Claims14

Dependent claims

An apparatus for cooling a ram spindle and compensating for a load, the apparatus comprising:

a saddle installed to be transferred along a cross rail;
a ram spindle installed to be transferred along the saddle;
a transfer unit configured to transfer the ram spindle relative to the saddle by means of a box guideway;
a cooling unit configured to cool the ram spindle;
and
a load compensation unit including gibs and configured to adjust a load applied from the ram spindle to the saddle,
wherein the gibs are provided as a plurality of gibs provided inside the saddle, disposed between the saddle and the ram spindle, except for a reference surface with which the ram spindle is in close contact, and installed to correspond to the reference surface in a horizontal direction or a vertical direction.

4 more elements

A machine tool comprising an apparatus for cooling a ram spindle and compensating for a load, the machine tool comprising:

a bed;
a pair of columns installed at two opposite sides of the bed and extending in a height direction;
a cross rail installed to be transferred along the pair of columns;
a saddle installed to be transferred along the cross rail;
a ram spindle installed to be transferred along the saddle;
and
an apparatus for cooling the ram spindle and compensating for a load configured to cool the ram spindle and compensate for a load when the ram spindle is thermally expanded,
wherein the apparatus for cooling a ram spindle and compensating for a load comprises:
a transfer unit having a driving unit and configured to transfer the ram spindle relative to the saddle by means of a box guideway;
a cooling unit configured to cool the ram spindle;
and
a load compensation unit including a plurality of gibs provided inside the saddle, disposed between the saddle and the ram spindle, except for a reference surface with which the ram spindle is in close contact, and installed to correspond to the reference surface in a horizontal direction or a vertical direction, the load compensation unit being configured to automatically compensate for a load applied from the ram spindle to the saddle,
wherein the cooling unit cools the ram spindle when the ram spindle is thermally deformed, and
wherein when a load applied to the gib is changed by the thermal deformation of the ram spindle, the load is automatically compensated so that surface pressure applied to the gib is constantly maintained.

11 more elements

Dependencies are inferred from the claim text.

Apparatus for cooling and load-compensating ram spindle and machine tool including same

Life of this patent

Apparatus for cooling and load-compensating ram spindle and machine tool including same

Life of this patent

Abstract

Claims14