Control method for the movement of a tool and control device

Patent metadata

Field	Value
Publication number	US-2018239337-A1
Application number	US-201615754730-A
Country	US
Kind code	A1
Filing date	Jun 17, 2016
Priority date	Aug 24, 2015
Publication date	Aug 23, 2018
Grant date	—

Abstract

In a control method for the movement of a tool with a machine tool, the machine tool involves a numerically controlled machine tool, in order to produce an arbitrary required surface of a workpiece by machining. A numeric path program is created which describes the machining of the workpiece with the tool at machining points and which controls the control device. The numeric path program produces a path with respect to the geometric nature of the surface of the workpiece to be machined, with the path including a plurality of sample points and individual paths, with each individual path connecting a pair of the sample points to each other. The numeric path program is evaluated and selected on the basis of a geometric quality criterion, with the geometric quality criterion having continuity as at least one criterion.

First claim

What is claimed is:

1 .- 19 . (canceled)

20 . A control method for the movement of a tool with a machine tool, the machine tool being controlled by a control device, in order to produce an arbitrary required surface of a workpiece by machining, comprising:
creating a numeric path program which describes the machining of the workpiece with the tool at machining points and which controls the control device; producing by the numeric path program a path with respect to the geometric nature of the surface of the workpiece to be machined, the path consisting of a plurality of sample points and individual paths, each individual path connecting a pair of these sample points to each other, and the path comprising different individual paths; evaluating each individual path according to a geometric quality criterion; selecting the individual paths, which have a preferred direction, according to the geometric quality criterion; selecting the path according to the preferred directions of the individual paths; calculating, evaluating and selecting by a combination tool the numeric path program for the control of the machine tool on the basis of the geometric quality criterion, the geometric quality criterion comprising a suitable combination of curvature continuity, tangency continuity and characteristics of the machine tool; producing the path; and controlling the machine tool to produce the required surface of the workpiece in accordance with the produced path.

21 . The control method of claim 20 , wherein a plurality of path programs is produced for the arbitrary required surface and are evaluated and selected with respect to the geometric quality criterion.

22 . The control method of claim 20 , wherein the machine tool is a cutting machine tool, in particular a milling machine.

23 . A control device for the movement of a tool with a machine tool, the machine tool being controlled by a control device, in order to produce an arbitrary required surface of a workpiece by machining, the control device comprising a numerically controlled machine tool configured to:
create a numeric path program which describes the machining of the workpiece with the tool at machining points and which controls the control device; produce by the numeric path program a path with respect to the geometric nature of the surface of the workpiece to be machined, the path consisting of a plurality of sample points and individual paths, each individual path connecting a pair of these sample points to each other, and the path comprising different individual paths; evaluate each individual path according to a geometric quality criterion; select the individual paths, which have a preferred direction, according to the geometric quality criterion; calculate, evaluate and select by a combination tool the numeric path program for the control of the machine tool on the basis of the geometric quality criterion, the geometric quality criterion comprising a suitable combination of curvature continuity, tangency continuity and characteristics of the machine tool; produce the path; and control the machine tool to produce the required surface of the workpiece in accordance with the produced path.

24 . The control device of claim 23 , wherein a plurality of path programs is produced for the arbitrary required surface and are evaluated and selected with respect to the geometric quality criterion.

25 . The control device of claim 23 , wherein the machine tool is a cutting machine tool.

26 . The control device of claim 23 , wherein the machine tool is a milling machine.

Assignees

• Siemens Ag

Inventors

• Hamm Carsten
• Lorenz Florian Nikolaus

Classifications

• G05B2219/45145

  Milling · CPC title

• G05B2219/45165

  Laser machining · CPC title

• G05B19/40937 Primary

  concerning programming of machining or material parameters, pocket machining · CPC title

• G05B2219/35121

  Generate connection between two paths · CPC title

• B23Q15/08

  Control or regulation of cutting velocity (B23Q15/12 takes precedence) · CPC title