Method of evaluating a machined surface of a workpiece, a controlling apparatus and a machine tool

Patent metadata

Field	Value
Publication number	US-10018989-B2
Application number	US-201314780943-A
Country	US
Kind code	B2
Filing date	Mar 29, 2013
Priority date	Mar 29, 2013
Publication date	Jul 10, 2018
Grant date	Jul 10, 2018

Abstract

A worked surface of a workpiece is evaluated on the basis of how the surface is actually perceived by a person's (observer's) eyes (vision) or fingers (touch), and a work process whereby a workpiece is worked is changed on the basis of the evaluation.

First claim

The invention claimed is:

1. A method comprising the steps of:
obtaining a shape of machined surface of a workpiece and shapes of cusps formed in the machined surface by simulation calculation based on a given set of machining conditions of the workpiece;
calculating luminance of reflecting light on the machined surface based on the obtained shape of the machined surface and the obtained shapes of the cusps;
calculating a contrast based on the luminance of reflecting light;
calculating a spatial frequency of the machined surface based on intervals between the cusps in the machined surface;
determining a position of the machined surface in a contrast sensitivity function diagram having a contrast axis and a spatial frequency axis and presenting a contrast sensitivity curve that separates a first region of the diagram from a second region of the diagram; and
not changing the machining conditions when the position of the machined surface in the diagram falls in the first region, and changing the machining conditions so as to reduce visibility of the cusps on the machined surface when the position of the machined surface in the diagram falls in the second region.

Assignees

• Makino Milling Machine

Inventors

• Oda Mitsunari

Classifications

• G01B11/30

  for measuring roughness or irregularity of surfaces · CPC title

• G05B2219/37402

  Flatness, roughness of surface · CPC title

• G05B19/4093 Primary

  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

• G01N21/4738

  Diffuse reflection (precedence is given to G01N21/55 - G01N21/57 if specular component is taken into consideration), e.g. also for testing fluids, fibrous materials · CPC title

• G05B2219/32215

  If detected shape not correct, simulate new machine, tool and adapt path · CPC title