Tool path display apparatus having display unit for acceleration or jerk of tool tip point

Patent metadata

Field	Value
Publication number	US-9304507-B2
Application number	US-201213532876-A
Country	US
Kind code	B2
Filing date	Jun 26, 2012
Priority date	Aug 25, 2011
Publication date	Apr 5, 2016
Grant date	Apr 5, 2016

Abstract

A tool path display apparatus ( 20 ) includes a tool coordinate value calculation unit ( 22 ) that calculates tool commanded coordinate values and tool actual coordinate values, based on commanded value time series data of position commands for a plurality of axes, detected value time series data of position detected values for the plurality of axes, and the structure of a machine tool, an acceleration calculation unit ( 23 ) that calculates accelerations of a tip point of a tool using the tool commanded coordinate values and the tool actual coordinate values, and a display format selection unit ( 24 ) that selects display formats of the accelerations of the tool commanded coordinate values and the tool actual coordinate values.

First claim

The invention claimed is:

1. A tool path display apparatus of a machine tool, the tool path display apparatus configured for displaying a path of a tip point of a tool of the machine tool, the machine tool configured for controlling a position and posture of at least one of the tool and a workpiece by a plurality of drive axes using a numerical control apparatus, the tool path display apparatus comprising:
a command generation unit configured to generate position commands for the plurality of drive axes per predetermined control cycle;
position detectors that are attached to each of the plurality of drive axes and configured to detect a position of each of the plurality of drive axes per predetermined control cycle;
a position data acquiring unit configured to
aquire the position commands generated by the command generation unit per predetermined control cycle, as commanded value time series data, and
aquire position detected values detected by the position detectors per predetermined control cycle, as detected value time series data;

a tool coordinate value calculation unit configured to
calculate a tool commanded coordinate value of the tip point of the tool, in association with the commanded value time series data, based on the commanded value time series data and a structure of the machine tool, and
calculate a tool actual coordinate value of the tip point of the tool, in association with the detected value time series data, based on the detected value time series data and the structure of the machine tool;

an acceleration calculation unit configured to
calculate an acceleration or a jerk of the tip point of the tool using at least three pieces of data of the tool commanded coordinate values, and
calculate the acceleration or the jerk of the tip point of the tool using at least three pieces of data of the tool actual coordinate values; and

a display format selection unit configured to select display formats of the accelerations or the jerks of the tool commanded coordinate values and the tool actual coordinate values constituting the path of the tip point of the tool, wherein
the display format selection unit is configured to perform at least one of:
vector display to display the accelerations or the jerks as acceleration vectors or jerk vectors on the path of the tip point of the tool; and
connection display to display a connection that connects between end points of neighboring acceleration vectors or jerk vectors, and

the tool path display apparatus further comprises a display unit configured to display the accelerations or the jerks, with the path of the tip point of the tool, in accordance with the display formats selected by the display format selection unit.

2. The tool path display apparatus as defined in claim 1 , wherein the acceleration calculation unit is configured to calculate tangential or normal accelerations using at least three consecutive pieces of data of the tool commanded coordinate values and the tool actual coordinate values.

3. The tool path display apparatus as defined in claim 1 , wherein the acceleration calculation unit is configured to calculate tangential or normal jerks using at least four consecutive pieces of data of the tool commanded coordinate values and the tool actual coordinate values.

4. The tool path display apparatus as defined in claim 1 , wherein the display format selection unit is configured to display, on the display unit, normal acceleration vectors or normal jerk vectors which have starting points and end points,
the starting points are defined by a plurality of predetermined points in a straight line or a curved line connecting between mutually neighboring pieces of data of the tool commanded coordinate values or the tool actual coordinate values, and
each of the end points is defined by an intersection of
a straight line that is perpendicular to a tangential line at a corresponding predetermined point among the plurality of predetermined points and that passes through said corresponding predetermined point, and
a connection of the normal acceleration vectors or a connection of the normal jerk vectors.

5. The tool path display apparatus as defined in claim 1 , wherein the display format selection unit is configured to enlarge or reduce at least one of the acceleration vectors, the jerk vectors, the connection of the acceleration vectors and the connection of the jerk vectors, in a direction of the acceleration vectors or the jerk vectors, by an arbitrary magnification.

Assignees

• Tezuka Junichi
• Ogawa Hajime
• Fanuc Corp

Inventors

• Tezuka Junichi
• Ogawa Hajime

Classifications

• G05B19/4069

  Simulating machining process on screen (G05B19/4068 takes precedence) · CPC title

• G05B2219/35349

  Display part, programmed locus and tool path, traject, dynamic locus · CPC title

• G05B19/408 Primary

  characterised by data handling or data format, e.g. reading, buffering or conversion of data · CPC title