US 12,472,599 B2
Sag compensation apparatus of machine tool and machine tool including same
Youngkun Jung, Changwon-si (KR)
Assigned to DN SOLUTIONS CO., LTD., Changwon-si (KR)
Appl. No. 17/920,580
Filed by DN SOLUTIONS CO., LTD., Changwon-si (KR)
PCT Filed Apr. 22, 2021, PCT No. PCT/KR2021/005104
§ 371(c)(1), (2) Date Oct. 21, 2022,
PCT Pub. No. WO2021/215848, PCT Pub. Date Oct. 28, 2021.
Claims priority of application No. 10-2020-0049667 (KR), filed on Apr. 23, 2020.
Prior Publication US 2023/0158625 A1, May 25, 2023
Int. Cl. B23Q 15/22 (2006.01); B23Q 11/00 (2006.01); B23Q 23/00 (2006.01)
CPC B23Q 15/22 (2013.01) [B23Q 11/0025 (2013.01); B23Q 23/00 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A sag compensation apparatus of a machine tool, the sag compensation apparatus comprising:
a base unit;
a housing unit having a hollow portion therein and coupled and installed onto the base unit;
a cylinder unit installed in the hollow portion and configured to be movable upward or downward;
a support unit extending while penetrating the cylinder unit and having one side coupled to a bed or a column and the other side coupled to the base unit;
a flow path unit having one side installed while penetrating a part of the housing unit; and
a compensation unit installed to communicate with the other side of the flow path unit and configured to recover or supply, through the flow path unit, hydraulic pressure between the housing unit and the cylinder unit in accordance with a load of the cylinder unit,
wherein,
the housing unit comprises a catching projection part formed to be stepped toward the inside of the hollow portion, and the cylinder unit comprises a flange part protruding to the outside of the cylinder unit and extending in a height direction,
a chamber part is provided in the hollow portion and formed between a lower end of the flange part and the catching projection part,
one side of the flow path unit is installed to communicate with the chamber part,
the compensation unit recovers hydraulic pressure in the chamber part through the flow path unit when the load of the cylinder unit increases, and
the compensation unit supplies the hydraulic pressure to the chamber part through the flow path unit when the load of the cylinder unit decreases.