Numerical control device inspecting screw holes

Patent metadata

Field	Value
Publication number	US-2016274576-A1
Application number	US-201615063540-A
Country	US
Kind code	A1
Filing date	Mar 8, 2016
Priority date	Mar 18, 2015
Publication date	Sep 22, 2016
Grant date	—

Abstract

A numerical control device of the present invention includes a control unit that controls a machining tool including a main axis having a screw-hole inspection gauge attached thereto in such a way that a feed-axis motor and a main-axis motor for the main axis perform operations for screw-hole inspection based on a machining program and a determining unit that determines acceptance/defect of inspection of a screw hole machined on a workpiece based on a condition of the feed-axis motor or the main-axis motor during control by the control unit.

First claim

1 . A numerical control device controlling a feed-axis motor and a main-axis motor that drive a main axis of a machining tool that performs screw-hole machining on a workpiece based on a machining program, wherein
a screw-hole inspection gauge is attachable to the main axis of the machining tool, and the numerical control device comprises: a control unit that performs control in such a way that the feed-axis motor and the main-axis motor that drive the main axis with the screw hole inspection gauge attached thereto perform a screw-hole inspection operation based on the machining program; and a determining unit that determines acceptance/defect of inspection of a screw hole machined on the workpiece based on a condition of the feed-axis motor or a condition of the main-axis motor during control by the control unit.

2 . The numerical control device according to claim 1 , wherein the screw-hole inspection gauge is a tool for Go side determination, and the inspection of the screw hole machined on the workpiece is Go side determination inspection.

3 . The numerical control device according to claim 1 , wherein the screw-hole inspection gauge is a tool for No Go side determination, and the inspection of the screw hole machined on the workpiece is No Go side determination inspection.

4 . The numerical control device according to claim 1 , wherein the screw-hole inspection gauge is a tool for main-axis torque cumulation determination, and the inspection of the screw hole machined on the workpiece is main-axis torque cumulation determination inspection.

5 . The numerical control device according to claim 1 , wherein
at least one of a torque lower limit and a torque upper limit for a warning of the main-axis motor is set in advance, and the determining unit performs warning display when a torque value of the main axis motor fails to satisfy at least one of the torque lower limit and the torque upper limit for a warning.

6 . The numerical control device according to claim 1 , wherein at least one of a main-axis torque cumulation lower limit and a main-axis torque cumulation upper limit for a warning of the main-axis motor is set in advance, and
the determining unit performs warning display when a torque cumulation value of the main axis of the main-axis motor fails to satisfy at least one of the main-axis torque cumulation lower limit and the main-axis torque cumulation upper limit for a warning.

7 . The numerical control device according to claim 1 , further comprising a soft floating setting unit that lowers a torque limit of the feed-axis motor and a torque limit of the main-axis motor before the screw-hole inspection gauge is inserted into the screw hole machined on the workpiece, and makes a limit of a positional deviation amount of the feed-axis motor changeable temporarily, wherein
in insertion of the screw-hole inspection gauge into the screw hole machined on the workpiece, the control unit drives the feed-axis motor in a direction that the screw-hole inspection gauge is inserted into the screw hole, and when the positional deviation amount of the feed-axis motor exceeds the limit of the positional deviation amount of the feed-axis motor, the control unit temporarily stops the feed-axis motor, rotates the main-axis motor in a screw-in direction, and re-drives the feed-axis motor at a time point at which the positional deviation of the feed-axis motor is eliminated.

8 . The numerical control device according to claim 1 , wherein the numerical control device operates in at least two modes that are a normal mode in which machining control is performed on a workpiece based on a machining program and a screw-hole inspection mode in which operation control for screw-hole inspection is performed based on a machining program, and
the control unit, when the numerical control device operates in the screw-hole inspection mode, performs control in such a way that the feed-axis motor and the main-axis motor perform an operation for screw-hole inspection based on the machining program.

9 . The numerical control device according to claim 8 , wherein
the numerical control device is switched to the screw-hole inspection mode by a signal or a G code.

10 . The numerical control device according to claim 2 , wherein
at least one of a torque lower limit and a torque upper limit for a warning of the main-axis motor is set in advance, and the determining unit performs warning display when a torque value of the main axis motor fails to satisfy at least one of the torque lower limit and the torque upper limit for a warning.

11 . The numerical control device according to claim 4 , wherein at least one of a main-axis torque cumulation lower limit and a main-axis torque cumulation upper limit for a warning of the main-axis motor is set in advance, and
the determining unit performs warning display when a torque cumulation value of the main axis of the main-axis motor fails to satisfy at least one of the main-axis torque cumulation lower limit and the main-axis torque cumulation upper limit for a warning.

Assignees

• Fanuc Corp

Inventors

• Fujiyama Jirou

Classifications

• G05B2219/36201

  Hole machining · CPC title

• G05B19/41875 Primary

  characterised by quality surveillance of production · CPC title

• G05B2219/49196

  Screw · CPC title

• G05B2219/37441

  Use nc machining program, cad data for measuring, inspection · CPC title

• G05B2219/33129

  Group spindles, axis into motion groups, nc channel structure · CPC title