Machine tool provided with clamping jig for rotationally-symmetrical body

Patent metadata

Field	Value
Publication number	US-9884395-B2
Application number	US-201514744167-A
Country	US
Kind code	B2
Filing date	Jun 19, 2015
Priority date	Jun 20, 2014
Publication date	Feb 6, 2018
Grant date	Feb 6, 2018

Abstract

Provided is a machine tool which performs a cutting work on a workpiece, in which holes are provided at three or more points in a circumferential direction of a jig in the vicinity of a point at which the jig comes into contact with the workpiece when the workpiece is placed on the jig, and the workpiece is moved toward a rotation center of the jig by blowing air from an air supply unit toward the workpiece through the holes.

First claim

The invention claimed is:

1. A machine tool, comprising:
a jig configured to fix a workpiece to perform a cutting work on the workpiece;
an arm configured to press the workpiece against the jig;
a rotating table configured to rotate the workpiece; and
an air supply unit configured to supply air,
wherein
the arm includes holes at three or more points on a circumference in the vicinity of a point at which the arm comes into contact with the workpiece when the workpiece is fixed to the jig,
the air supply unit is configured to supply the air through the holes,
wherein
the arm includes an arm protrusion configured to be inserted into a center hole of the workpiece wherein the arm protrusion projects into only a part of the center hole of the workpiece,
the holes are provided in the arm protrusion,
the machine tool further comprises a pressure adjusting unit configured to control a pressure of the air which is discharged from each of the holes and is blown toward the workpiece placed on the jig,
the holes are disposed at intervals which are not equal to each other, and
the pressure adjusting unit is configured to control the pressure of the air from the holes which are closer to each other to be lower than the pressure of the air from the holes which are farther from each other.

2. The machine tool according to claim 1 , wherein
the arm has a width and a length greater than the width,
the length of the arm is oriented in a radial direction of the rotating table, and
the arm protrusion extends from an end of the arm downwardly, along a rotational axis of the rotating table, toward the jig.

3. A machine tool, comprising:
a jig configured to fix a workpiece to perform a cutting work on the workpiece;
an arm configured to press the workpiece against the jig;
a rotating table configured to rotate the workpiece; and
an air supply unit configured to supply air,
wherein
the arm includes holes at three or more points on a circumference in the vicinity of a point at which the arm comes into contact with the workpiece when the workpiece is fixed to the jig,
the air supply unit is configured to supply the air through the holes,
the arm includes an arm center hole portion into which a protrusion of the workpiece is to be inserted,
the holes are provided in the arm center hole portion,
a pressure adjusting unit configured to control a pressure of the air which is discharged from each of the holes and is blown toward the workpiece placed on the jig,
the holes are disposed at intervals which are not equal to each other, and
the pressure adjusting unit is configured to control the pressure of the air from the holes which are closer to each other to be lower than the pressure of the air from the holes which are farther from each other.

4. A machine tool, comprising:
a jig configured to fix a workpiece to perform a cutting work on the workpiece;
an arm configured to press the workpiece against the jig;
a rotating table configured to rotate the workpiece; and
an air supply unit configured to supply air,
wherein
the arm includes holes at three or more points on a circumference in the vicinity of a point at which the arm comes into contact with the workpiece when the workpiece is fixed to the jig,
the air supply unit is configured to supply the air through the holes,
the arm includes an arm center hole portion into which a protrusion of the workpiece is to be inserted,
the holes are provided in the arm center hole portion,
the arm has a width and a length greater than the width,
the length of the arm is oriented in a radial direction of the rotating table,
the arm protrusion extends from an end of the arm downwardly, along a rotational axis of the rotating table, toward the jig, and
the holes are oriented radially inwardly toward an interior of the arm center hole portion, and are configured to blow the air supplied from the air supply unit radially inwardly toward the protrusion of the workpiece.

Assignees

• Fanuc Corp

Inventors

• Okuda Shinji

Classifications

• B23Q3/062

  adapted for holding workpieces having a special form or being made from a special material · CPC title

• B23Q3/069

  for pressing workpieces against a work-table · CPC title

• B23Q3/183 Primary

  Centering devices · CPC title

• B23Q3/002

  Means to press a workpiece against a guide · CPC title

• B23Q3/08 Primary

  other than mechanically-actuated {(B23Q3/061, B23Q3/066, and B23Q3/067 take precedence)} · CPC title