Numerical control device

Patent metadata

Field	Value
Publication number	US-9417620-B2
Application number	US-201214425564-A
Country	US
Kind code	B2
Filing date	Dec 4, 2012
Priority date	Sep 4, 2012
Publication date	Aug 16, 2016
Grant date	Aug 16, 2016

Abstract

A numerical control device controls a machine tool having an X axis for moving a turret to which tools are attached, a Z axis for moving work, and a B axis for rotating the turret and having at least one of an H axis for rotating the turret around a center line perpendicular to the center line of rotation of the B axis and a C axis for rotating the work around a center line parallel to the Z axis. The numerical control device includes a unit that performs, during an virtual Y-axis inclined surface machining mode, virtual Y inclined surface machining for moving the tool along the Y axis relatively to the inclined surface in a state in which the tool is inclined such that a center axis is perpendicular to an inclined surface inclined from the X axis and the Z axis.

First claim

The invention claimed is:

1. A numerical control device that controls a machine tool
having
an X axis for moving a turret to which a tool is attached,
a Z axis for moving work, and
a B axis for rotating the turret around a center line perpendicular to the X axis and the Z axis,

having at least one of an H axis for rotating the turret around a center line perpendicular to a center line of rotation of the B axis and a C axis for rotating the work around a center line parallel to the Z axis, and
not having a Y axis orthogonal to the X axis and the Z axis,
the numerical control device comprising:
a unit that performs, during a virtual Y-axis inclined surface machining mode for controlling the tool to move along X-Y-Z axes relatively to the work according to an X-Y-Z axis movement command in a machining program, virtual Y inclined surface machining for moving the tool along the Y axis relatively to the inclined surface in a state in which the tool is inclined such that a center axis is perpendicular to an inclined surface inclined from the X axis and the Z axis, wherein
a center axis of the tool
extends in parallel to a rotation center line of the H axis, and
is apart from the rotation center line of the H axis.

2. The numerical control device according to claim 1 , wherein
the machine tool has the H axis, and
the unit that performs the virtual Y inclined surface machining includes
a unit that performs virtual Y inclined surface interpolation for
transforming the X-Y-Z axis movement command in the machining program into a command in an X-Z-H coordinate system and
driving the X axis, the Z axis, and the H axis in association with one another according to the transformed command.

3. The numerical control device according to claim 1 , wherein
the machine tool has the C axis, and
the unit that performs the virtual Y inclined surface machining includes
a unit that performs virtual Y inclined surface interpolation for
transforming the X-Y-Z axis movement command in the machining program into a command in an X-Z-C coordinate system and
driving the X axis, the Z axis, and the C axis in association with one another according to the transformed command.

4. The numerical control device according to claim 2 , wherein
the unit that performs the virtual Y inclined surface interpolation includes:
an X-Y-Z-axis interpolating unit that interpolates X-Y-Z axis positions in a program coordinate system on the basis of the X-Y-Z axis movement command in the machining program;
a polar-coordinate transforming unit that calculates, according to the interpolated X-Y-Z axis positions in the program coordinate system, a polar coordinate including a rotation center coordinate of the H axis and a rotation angle of the H axis in the program coordinate system; and
an X-Z-H-axis interpolating unit that interpolates X-Z-H axis positions in a machine coordinate system according to the calculated polar coordinate in the program coordinate system.

5. The numerical control device according to claim 3 , wherein
the unit that performs the virtual Y inclined surface interpolation includes:
an X-Y-Z-axis interpolating unit that interpolates X-Y-Z axis positions in a program coordinate system on the basis of the X-Y-Z axis movement command in the machining program;
a polar-coordinate transforming unit that calculates, according to the interpolated X-Y-Z axis positions in the program coordinate system, a polar coordinate including a rotation center coordinate of the C axis and a rotation angle of the C axis in the program coordinate system; and
an X-Z-C-axis interpolating unit that interpolates X-Z-C axis positions in a machine coordinate system according to the calculated polar coordinate in the program coordinate system.

6. The numerical control device according to claim 1 , wherein
the machine tool has the H axis, and
the unit that performs the virtual Y inclined surface machining includes
a unit that performs a startup operation for
transforming a movement start position corresponding to the X-Y-Z axis movement command in the machining program into a command in an X-Z-H-B coordinate system,
driving the X axis, the Z axis, the H axis, and the B axis in association with one another according to the transformed command, and
changing the tool to an inclined state such that a center axis is perpendicular to the inclined surface and moving the tool to a machining start position of the work.

7. The numerical control device according to claim 1 , wherein
the machine tool has the C axis, and
the unit that performs the virtual Y inclined surface machining includes
a unit that performs a startup operation for
transforming a movement start position corresponding to the X-Y-Z axis movement command in the machining program into a command in an X-Z-C-B coordinate system,
driving the X axis, the Z axis, the C axis, and the B axis in association with one another according to the transformed command, and
changing the tool to an inclined state such that a center axis is perpendicular to the inclined surface and moving the tool to a machining start position of the work.

8. The numerical control device according to claim 1 , wherein
the unit that performs the virtual Y inclined surface machining simultaneously performs, in parallel, during the virtual Y-axis inclined surface machining mode,
a first operation for moving the tool to a machining start position of the work and
at least one of a second operation for replacing the tool and a third operation for performing positioning of the work.

9. The numerical control device according to claim 6 , wherein
the unit that performs the startup operation repeatedly gives commands to the B axis during the virtual Y-axis inclined surface machining mode, and
the unit that performs the virtual Y inclined surface machining continuously machines inclined surfaces having different inclination angles.

10. The numerical control device according to claim 7 , wherein
the unit that performs the startup operation repeatedly gives commands to the B axis during the virtual Y-axis inclined surface machining mode, and
the unit that performs the virtual Y inclined surface machining continuously machines inclined surfaces having different inclination angles.

Assignees

• Terada Koji
• Sagasaki Masakazu
• Mitsubishi Electric Corp

Inventors

• Terada Koji
• Sagasaki Masakazu

Classifications

• G05B19/19 Primary

  characterised by positioning or contouring control systems, e.g. to control position from one programmed point to another or to control movement along a programmed continuous path · CPC title

• G05B2219/34015

  Axis controller · CPC title

• G05B19/4093

  characterised by part programming, e.g. entry of geometrical information as taken from a technical drawing, combining this with machining and material information to obtain control information, named part program, for the NC machine · CPC title

• B23Q2220/002

  Tool turrets · CPC title

• B23B3/162 Primary

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