Method for machining a workpiece in a machine tool with optimized machining time

Patent metadata

Field	Value
Publication number	US-10558193-B2
Application number	US-201715459830-A
Country	US
Kind code	B2
Filing date	Mar 15, 2017
Priority date	Mar 16, 2016
Publication date	Feb 11, 2020
Grant date	Feb 11, 2020

Abstract

To optimize an automatically optimized machining time for machining a workpiece in a machine tool, an original parts program is loaded into a machine tool controller. The machining of the workpiece using the original parts program is simulated, where a motion path generated by the original parts program in the machine tool is determined. The motion path is classified into at least one area of potential optimization in which there is no workpiece contact. The at least one area of potential optimization is assigned a tolerance space. An optimized motion path is determined within the tolerance space. The machining of the workpiece using the modified parts program is simulated. The optimized motion path is displayed and marked. Once a user has approved the modification in the parts program, machining of the workpiece takes place using the modified parts program.

First claim

What is claimed as new and desired to be protected by Letters Patent is set forth in the appended claims and includes equivalents of the elements recited therein:

1. A method for machining a workpiece in a numerically controlled machine tool with an optimized machining time, comprising:
connecting the numerically controlled machine tool to a machine tool controller;
loading an original parts program into the machine tool controller;
determining an original motion path generated in the machine tool controller by the original parts program;
simulating machining of the workpiece using the original parts program;
classifying the motion path into at least one area of a potential optimization with no workpiece contact;
assigning to the at least one area of the potential optimization a tolerance space having a first tolerance sub-space with a geometric extent defined by geometry values of the machine tool and the workpiece in which the motion path is unobstructed, and
a second tolerance sub-space having a geometric extent defined by dynamic values of the machine tool, wherein at least one of the dynamic values comprises a machine speed;
determining an optimized tolerance space as the tolerance space having the smaller geometric extent of the first and second tolerance sub-space;
determining an optimized motion path within the optimized tolerance space having a movement time along the optimized motion path between entering the optimized tolerance space and exiting the optimized tolerance space that is less than a movement time along the motion path in the original parts program;
simulating machining of the workpiece using a modified parts program that incorporates the optimized motion path;
displaying and marking the optimized motion path;
approving by a user the modified parts program; and
machining of the workpiece with the optimized machining time using the modified parts program.

2. The method of claim 1 , further comprising storing the modified parts program for machining at least one other workpiece.

3. The method of claim 1 , further comprising:
limiting the speed to a value less than a highest permissible speed of the machine tool.

4. The method of claim 1 , wherein at least one of the dynamic values further comprises an acceleration and/or jerk along the motion path.

5. The method of claim 4 , further comprising limiting the acceleration and/or the jerk to a value less than a highest permissible acceleration and/or jerk of the machine toot.

6. The method of claim 1 , further comprising displaying the at least one area of the potential optimization together with a section of the original parts program which predefines a path movement in the at least one area of the potential optimization.

7. The method of claim 1 , wherein the classifying of the at least one area of the potential optimization is limited to steps of the parts program involving rapid-traverse tool movements.

8. The method of claim 1 , wherein the classifying of the at least one area of the potential optimization includes instructions for auxiliary functions in the parts program.

9. The method of claim 1 , wherein the modified parts program comprises polynomial, spline or NURBS (non-uniform rational B-splines) blocks.

Assignees

• Siemens Ag

Inventors

• Pitz Thomas
• Spielmann Ralf

Classifications

• G05B2219/36289

  Cutting, machining conditions by optimisation of time, cost, accuracy · CPC title

• G05B2219/36068

  Change program at allowed point of time or program step · CPC title

• G05B13/021

  in which a variable is automatically adjusted to optimise the performance · CPC title

• G05B2219/31443

  Keep track of nc program, recipe program · CPC title

• G05B19/21 Primary

  using an incremental digital measuring device · CPC title