Normal-line detection device, processing device, and normal-line detection method

Patent metadata

Field	Value
Publication number	US-9903714-B2
Application number	US-201414761628-A
Country	US
Kind code	B2
Filing date	Jan 10, 2014
Priority date	Jan 18, 2013
Publication date	Feb 27, 2018
Grant date	Feb 27, 2018

Abstract

A normal-line detection device is provided with: four or more non-contacting distance sensors for measuring the distance to a processing surface of a work piece, the non-contacting distance sensors being arranged on the periphery of a drill body, in an arrangement plane orthogonal to an axis line of the drill body, and a distance measurement axis of each non-contacting distance sensor and the axis line intersecting; and a PC for calculating an approximation surface of a processing surface on the basis of measurement values from the non-contacting distance sensors and the angle of the non-contacting distance sensors with respect to the axis line, and determining the normal-line of the approximation surface as the normal-line of the processing surface.

First claim

The invention claimed is:

1. A normal-line detection device comprising:
four or more distance measurement means for measuring a distance to a processing surface of a work piece, in which the distance measurement means are arranged on a periphery of a processing machine on a plane orthogonal to an axis line of a processing shaft of the processing machine and a measurement axis of each distance measurement means and the axis line of the processing shaft intersect each other; and
calculation means for calculating an approximation surface of the processing surface based on a measurement value measured by each distance measurement means and an angle of each distance measurement means with respect to the axis line of the processing shaft and obtaining a normal-line of the approximation surface as a normal-line of the processing surface,
wherein the calculation means determines a measurement value, in which a distance between the approximation surface and the distance measurement means is deviated from a predetermined range, measured by the distance measurement means, as a measurement value which is not suitable for calculation of the approximation surface.

2. The normal-line detection device according to claim 1 ,
wherein the predetermined range is made larger as a curvature of the work piece is increased.

3. The normal-line detection device according to claim 1 ,
wherein the calculation means removes the measurement value which is not suitable for the calculation of the approximation surface and obtains the approximation surface again.

4. The normal-line detection device according to claim 1 ,
wherein the angle of each distance measurement means with respect to the axis line of the processing shaft is an intersection angle between the measurement axis of the respective distance measurement means and the axis line of the processing shaft, and an azimuth angle to the respective distance measurement means based on a predetermined axis configuring the plane.

5. A processing device, comprising:
a processing machine which processes a work piece; and
the normal-line detection device according to claim 1 ,
wherein the processing machine and the work piece move relative to each other so that an axis line of a processing shaft of the processing machine is matched to a normal-line detected by the normal-line detection device.

6. The processing device according to claim 5 ,
wherein after the axis line of the processing shaft is matched to the normal-line of the processing surface, in a state where a tip of the processing machine comes into contact with a processing point with respect to the work piece, measurement of the distance is performed by the distance measurement means, and when deviation in the measurement values of the distance measurement means, in which the measurement value which is not suitable for the calculation of the approximation surface is removed, and is within a predetermined allowable range, processing is performed by the processing machine.

7. A normal-line detection method, comprising:
a first step of arranging four or more distance measurement means on the periphery of a processing machine on a plane orthogonal to an axis line of the processing machine, intersecting a measurement axis of each distance measurement means and an axis line of a processing shaft, and measuring a distance to a processing surface of a work piece; and
a second step of calculating an approximation surface of the processing surface based on a measurement value measured by each distance measurement means and an angle of each distance measurement means with respect to the axis line of the processing shaft, and obtaining a normal-line of the approximation surface as a normal-line of the processing surface,
wherein in the second step, a measurement value, in which a distance between the approximation surface and the distance measurement means is deviated from a predetermined range, measured by the distance measurement means, is determined as a measurement value which is not suitable for calculation of the approximation surface.

Assignees

• Mitsubishi Heavy Ind Ltd
• Mitsubishi Heavy Ind Ltd

Inventors

• Nihei Tomohiro

Classifications

• B21J15/28

  Control devices specially adapted to riveting machines not restricted to one of the preceding subgroups · CPC title

• G01B21/20 Primary

  for measuring contours or curvatures, e.g. determining profile · CPC title

• G01B11/255

  for measuring radius of curvature {(measuring diameter G01B11/08)} · CPC title

• G01B11/245

  using a plurality of fixed, simultaneously operating transducers ({G01B11/2408 - G01B11/2425, } G01B11/255 take precedence) · CPC title

• G01B11/026 Primary

  by measuring distance between sensor and object (G01B11/0608 takes precedence) · CPC title