Built-in type vision based inspection tool for autonomous setting of initial origin

Patent metadata

Field	Value
Publication number	US-9841748-B2
Application number	US-201414497871-A
Country	US
Kind code	B2
Filing date	Sep 26, 2014
Priority date	Oct 2, 2013
Publication date	Dec 12, 2017
Grant date	Dec 12, 2017

Abstract

The present invention relates to a vision based inspection tool for setting of an initial origin of an automation machine tool, and more particularly, to a built-in type of vision based inspection tool for setting of an initial origin capable of improving setting precision of a current automation machine tool that depends on initial setting and increasing productivity depending on individual automatic setting by automatically sensing a machining origin in order to perform initial machining and re-machining of an existing workpiece using an automation machine tool and compensating for the machining origin to eliminate a time required for setting machining origins for various shapes in a jog mode.

First claim

What is claimed is:

1. A built-in type of vision based inspection tool for autonomous setting of an initial origin provided in a chuck used in an automatic tool changer (ATC) of a machine tool, comprising:
a docking part provided at one side of the chuck and mounted on the machine tool;
an image part provided at one side of the docking part and obtaining an image of a workpiece seated on the machine tool; and
an embedded part provided between the docking part and the image part and performing auto-focusing through the image and machining origin setting depending on the auto-focusing, and
wherein the embedded part includes:
a housing coupled to one side of the docking part and having a hollow inner portion; and
an embedded module buried in the hollow inner portion of the housing, and including: a digital signal processor (DSP) board; a wireless communication part disposed at one side of the DSP board so as to be spaced apart from the DSP board; and power supply parts disposed between the DSP board and the wireless communication part, and
wherein the DSP board and the wireless communication part are formed in a disk shape in which they have a predetermined diameter based on an axial direction of the chuck, and a plurality of power supply parts are installed on one surface of the DSP board and are radially disposed based on the axial direction of the chuck.

2. The built-in type vision based inspection tool for autonomous setting of an initial origin of claim 1 ,
wherein the image part includes:
a camera determining an image size of a machining origin portion of the workpiece and a focal length and irradiating analog type workpiece shape information to a charge coupled device (CCD) cell to digitize the analog type workpiece shape information;
a camera fixing part fixing the camera; and
an illuminating part providing light to the workpiece.

3. The built-in type of vision based inspection tool for autonomous setting of an initial origin of claim 2 , wherein the embedded part performs workpiece determining work using an image signal output from the image part and machining origin detecting work in a thickness direction of the workpiece through sharpness of the image and transfers the detected machining origin to a controller of the machine tool, and transfers the detected machining origin to the controller of the machine tool using RS-232 or Bluetooth wireless communication.

4. The built-in type vision based inspection tool for autonomous setting of an initial origin of claim 1 , wherein the DSP board includes:
a trigger interface part synchronized with a trigger signal using a machine origin completion signal of the machine tool as the trigger signal to obtain the image;
a buffer part storing and processing the previous image in order to prepare for the case of machining the same workpiece as the previous workpiece;
a filter part detecting an edge line of the workpiece through the image obtained by the buffer part in order to process the image;
an auto-focusing part performing auto-focusing based on sharpness of the image obtained by the trigger interface part so as to detect a machining origin in a thickness direction of the workpiece; and
a machining origin detecting part detecting a machining origin using information transferred from the trigger interface part, the buffer part, the filter part, and the auto-focusing part, and
the machining origin detected by the machining origin detecting part is transferred to a controller of the machine tool through the wireless communication part.

Assignees

• Korea Inst Mach & Materials

Inventors

• Kim Dong-Hoon
• Song Joonyub

Classifications

• G05B2219/50042

  Return to origin, reference point, zero point, homing · CPC title

• G05B2219/37555

  Camera detects orientation, position workpiece, points of workpiece · CPC title

• G01N21/8806

  Specially adapted optical and illumination features · CPC title

• G05B19/401 Primary

  characterised by control arrangements for measuring, e.g. calibration and initialisation, measuring workpiece for machining purposes (G05B19/19 takes precedence) · CPC title

• G06T7/0004

  Industrial image inspection · CPC title