Method for setting up work piece based on vision

Patent metadata

Field	Value
Publication number	US-9766613-B2
Application number	US-201314374794-A
Country	US
Kind code	B2
Filing date	Jan 23, 2013
Priority date	Jan 26, 2012
Publication date	Sep 19, 2017
Grant date	Sep 19, 2017

Abstract

According to an exemplary embodiment of the present disclosure, a method of setting up a work piece based on a vision is present. The method of setting up a work piece based on a vision comprises: calculating a start point of a work piece from the image of a work piece within a vision screen formed by a camera; capturing an image when a tool is captured in the vision screen; and calculating an offset value of the tool from the captured image.

First claim

The invention claimed is:

1. A method of working a work piece based on a vision, comprising:
calculating a reference point of the work piece from an image of the work piece within a vision screen formed by a camera;
re-setting the calculated reference point as an operation start point; and
performing working according to a preset processing design based on the reset start point as a reference, wherein the performing of the working comprises:
detecting a position of an end point of a tool when the tool is captured in the vision screen;
calculating an offset value of the tool by using a distance between the start point of the work piece and the position of the end point of the tool; obtaining corrected coordinates of the tool by applying the offset; and performing the working based on the re-set start point and the corrected coordinates of the tool.

2. The method of claim 1 , wherein the re-setting of the calculated reference point as the operation start point comprises:
calculating pixel coordinates for the calculated reference point of the work piece; and
calculating pixel coordinates of the operation start point by using the pixel coordinates for the reference point of the work piece.

3. The method of claim 2 , wherein the calculating of the pixel coordinates of the operation start point comprises:
calculating a distance per pixel by using a scaler attached to the work piece; and
calculating pixel coordinates of the operation start point from a distance difference between the reference point of the work piece and the operation start point based on the pixel coordinates for the reference point of the work piece and the distance per pixel.

4. The method of claim 2 , wherein the calculating of the pixel coordinates of the operation start point from the distance difference between the reference point of the work piece and the operation start point comprises:
calculating the distance from the reference point of the work piece to the operation start point as first pixel displacement coordinates by using the distance per pixel; and
calculating pixel coordinates of the operation start point by adding the pixel coordinates for the reference point of the work piece and the first pixel displacement coordinates.

5. The method of claim 1 , wherein the calculating of the offset value of the tool comprises:
calculating the distance between the start point of the work piece and the position of the end point of the tool; and
calculating the offset value of the tool by using the calculated distance and a distance per pixel.

6. The method of claim 5 , wherein the calculating of the offset value of the tool comprises:
calculating a distance between the start point of the work piece and the position of the end point of the tool as second pixel displacement coordinates by using the distance per pixel; and
calculating pixel coordinates of the position of the end point of the tool by adding the second pixel displacement coordinates to the pixel coordinates of the start point.

7. A method of working a work piece based on a vision, comprising:
calculating a reference point of the work piece from an image of the work piece within a vision screen formed by a camera;
re-setting the calculated reference point as an operation start point;
capturing an image when a tool is captured in the vision screen;
obtaining corrected mechanical coordinates of the tool by applying an offset calculated by using screen coordinates of the tool calculated from the captured image; and
performing working according to a predefined processing design based on the reset operation start point and the corrected mechanical coordinates, wherein the offset of the tool is calculated by using:
detecting a position of an end point of the tool;
calculating a distance between a start point of the work piece and the position of the end point of the tool as pixel displacement coordinates by using the distance per pixel; and
calculating pixel coordinates of the position of the end point of the tool by adding the pixel displacement coordinates to the pixel coordinates of the start point.

8. The method of claim 7 , wherein calculating the reference point as the operation start point comprises:
calculating pixel coordinates for the calculated reference point of the work piece; and
calculating pixel coordinates of the operation start point by using the pixel coordinates for the reference point of the work piece.

9. The method of claim 8 , wherein calculating the pixel coordinates of the operation start point by using the pixel coordinates for the reference point of the work piece comprises:
calculating a distance per pixel by using a scaler attached to the work piece; and
calculating pixel coordinates of the operation start point from a distance difference between the reference point of the work piece and the operation start point based on the pixel coordinates for the reference point of the work piece and the distance per pixel.

10. The method of claim 9 , wherein calculating pixel coordinates of the operation start point from the distance difference between the reference point of the work piece and the operation start point comprises:
calculating the distance from the reference point of the work piece to the operation start point as first pixel displacement coordinates by using the distance per pixel; and
calculating pixel coordinates of the operation start point by adding the pixel coordinates for the reference point of the work piece and the first pixel displacement coordinates.

Assignees

• Doosan Infracore Co Ltd
• Doosan Machine Tools Co Ltd

Inventors

• Jang Gye Bong
• Kim Dong Hwan

Classifications

• B23Q17/2428

  for measuring existing positions of tools or workpieces · CPC title

• G05B19/402 Primary

  characterised by control arrangements for positioning, e.g. centring a tool relative to a hole in the workpiece, additional detection means to correct position (G05B19/19 takes precedence) · CPC title

• B23Q17/249

  using image analysis, e.g. for radar, infrared or array camera images · CPC title

• G05B19/4015

  going to a reference at the beginning of machine cycle, e.g. for calibration · CPC title

• G05B2219/50294

  Tool offset length by going to a reference and recording distance · CPC title