Machine tool provided with tool post

Patent metadata

Field	Value
Publication number	US-9724760-B2
Application number	US-201615345664-A
Country	US
Kind code	B2
Filing date	Nov 8, 2016
Priority date	Aug 7, 2014
Publication date	Aug 8, 2017
Grant date	Aug 8, 2017

Abstract

A machine tool comprises a main spindle, a tool post body provided with a first tool mounting part and a second tool mounting part facing each other with a workpiece inbetween in a predetermined facing direction, and a tool post body driving unit for moving the tool post body in at least the facing direction. The tool post body comprises a first tool post unit provided with the first tool mounting part, a second tool post unit provided with a portion of the second tool mounting part with a relative interval with respect to the first tool post unit in the facing direction kept constant, a third tool post unit provided with the remaining portion of the second tool mounting part with a relative interval kept variable; and a relatively-driving unit for moving the third tool post unit in the facing direction with respect to the first tool post unit.

First claim

The invention claimed is:

1. A machine tool comprising:
a main spindle movable in a predetermined direction with a workpiece gripped thereby;
a tool post body provided with a first tool mounting part and a second tool mounting part facing each other with the workpiece inbetween in a predetermined facing direction different from the predetermined direction, the tool post body being movable in at least the facing direction; and
a tool post body driving unit configured to move the tool post body in at least the facing direction, wherein the tool post body comprising:
a first tool post unit provided with the first tool mounting part;
a second tool post unit provided with a portion of the second tool mounting part with a relative interval with respect to the first tool post unit in the facing direction kept constant;
a third tool post unit provided with the remaining portion of the second tool mounting part with a relative interval with respect to the first tool post unit in the facing direction kept variable; and
a relatively-driving unit configured to relatively move the third tool post unit in the facing direction with respect to the first tool post unit.

2. The machine tool of claim 1 , wherein the first tool mounting part has a tool arranged in a tool arrangement direction different from the facing direction;
the tool post body comprises a base unit configured to connect an end of the first tool post unit and an end of the second tool post unit in the tool arrangement direction; and
the third tool post unit is separated from the base unit in the tool arrangement direction with the second tool post unit inbetween.

3. The machine tool of claim 2 , wherein the base unit comprises a third tool mounting part on the side the first tool post unit and the second tool post unit are provided.

4. The machine tool of claim 1 , wherein the tool post body is provided on a tool post table movable in at least the facing direction;
a dovetail is secured to the tool post table, the dovetail being of a trapezoid cross sectional shape widened as far from the tool post table with its longitudinal direction oriented along the facing direction;
a dovetail groove is formed on a facing surface of the third tool post unit with respect to the tool post table, to which the dovetail groove being slidably inserted; and
the facing surface is a non-contact surface on the periphery of the dovetail groove.

5. The machine tool of claim 2 , wherein the tool post body is provided on a tool post table movable in at least the facing direction;
a dovetail is secured to the tool post table, the dovetail being of a trapezoid cross sectional shape widened as far from the tool post table with its longitudinal direction oriented along the facing direction;
a dovetail groove is formed on a facing surface of the third tool post unit with respect to the tool post table, to which the dovetail groove being slidably inserted; and
the facing surface is a non-contact surface on the periphery of the dovetail groove.

6. The machine tool of claim 3 , wherein the tool post body is provided on a tool post table movable in at least the facing direction;
a dovetail is secured to the tool post table, the dovetail being of a trapezoid cross sectional shape widened as far from the tool post table with its longitudinal direction oriented along the facing direction;
a dovetail groove is formed on a facing surface of the third tool post unit with respect to the tool post table, to which the dovetail groove being slidably inserted; and
the facing surface is a non-contact surface on the periphery of the dovetail groove.

7. The machine tool of claim 1 further comprising a control unit for the tool post driving unit and the relatively-driving unit; wherein,
the control unit controls the tool post driving unit to move the first tool post unit at a velocity V 1 in the facing direction and controls the relatively-driving unit to move the third tool post unit at a velocity V 2 −V 1 in the facing direction to simultaneously move the first tool post unit at the velocity V 1 and the third tool post unit at a velocity V 2 in the facing direction.

8. The machine tool of claim 2 further comprising a control unit for the tool post driving unit and the relatively-driving unit; wherein,
the control unit controls the tool post driving unit to move the first tool post unit at a velocity V 1 in the facing direction and controls the relatively-driving unit to move the third tool post unit at a velocity V 2 −V 1 in the facing direction to simultaneously move the first tool post unit at the velocity V 1 and the third tool post unit at a velocity V 2 in the facing direction.

9. The machine tool of claim 3 further comprising a control unit for the tool post driving unit and the relatively-driving unit; wherein,
the control unit controls the tool post driving unit to move the first tool post unit at a velocity V 1 in the facing direction and controls the relatively-driving unit to move the third tool post unit at a velocity V 2 −V 1 in the facing direction to simultaneously move the first tool post unit at the velocity V 1 and the third tool post unit at a velocity V 2 in the facing direction.

10. The machine tool of claim 4 further comprising a control unit for the tool post driving unit and the relatively-driving unit; wherein,
the control unit controls the tool post driving unit to move the first tool post unit at a velocity V 1 in the facing direction and controls the relatively-driving unit to move the third tool post unit at a velocity V 2 −V 1 in the facing direction to simultaneously move the first tool post unit at the velocity V 1 and the third tool post unit at a velocity V 2 in the facing direction.

11. The machine tool of claim 5 further comprising a control unit for the tool post driving unit and the relatively-driving unit; wherein,
the control unit controls the tool post driving unit to move the first tool post unit at a velocity V 1 in the facing direction and controls the relatively-driving unit to move the third tool post unit at a velocity V 2 −V 1 in the facing direction to simultaneously move the first tool post unit at the velocity V 1 and the third tool post unit at a velocity V 2 in the facing direction.

12. The machine tool of claim 6 further comprising a control unit for the tool post driving unit and the relatively-driving unit; wherein,
the control unit controls the tool post driving unit to move the first tool post unit at a velocity V 1 in the facing direction and controls the relatively-driving unit to move the third tool post unit at a velocity V 2 −V 1 in the facing direction to simultaneously move the first tool post unit at the velocity V 1 and the third tool post unit at a velocity V 2 in the facing direction.

Assignees

• Star Mfg Co

Inventors

• Kawasumi Masahiro

Classifications

• B23B3/167 Primary

  lathe with two or more toolslides carrying turrets · CPC title

• B23B3/065 Primary

  Arrangements for performing other machining operations, e.g. milling, drilling · CPC title

• B23Q15/013

  Control or regulation of feed movement (B23Q15/12 takes precedence) · CPC title

• B23B29/26

  Tool holders in fixed position · CPC title

• B23Q1/628

  followed parallelly by a single sliding pair · CPC title