Orientation method for workpieces

Patent metadata

Field	Value
Publication number	US-10466680-B2
Application number	US-201615748045-A
Country	US
Kind code	B2
Filing date	Jul 11, 2016
Priority date	Jul 27, 2015
Publication date	Nov 5, 2019
Grant date	Nov 5, 2019

Abstract

The invention relates to a method (100) for orientation of a workpiece (20) to be processed, comprising the steps of: a) providing a processing path (27) fixed on the workpiece for processing the workpiece (20); b) selecting a rigid transformation (30) of the positioning of the workpiece (20); c) simulating the processing path (27) taking account of the rigid transformation (30) of the positioning of the workpiece (20); d) determining at least one process variable (40) of the machining of the workpiece (20); wherein the steps b) to d) are repeated by modifying the at least one rigid transformation (30) of the positioning of the workpiece (20) until the at least one process variable (40) reaches a target value (43).

First claim

The invention claimed is:

1. A method for the orientation of a workpiece that is to be machined, comprising the steps:
a) providing a workpiece-fixed processing path for a machining of the workpiece;
b) selecting a rigid transformation of a positioning of the workpiece;
c) simulating the workpiece-fixed processing path taking account of the rigid transformation of the positioning of the workpiece;
d) determining a process variable of the machining of the workpiece;
e) determining a desired target value for the process variable;
f) modifying the rigid transformation of the positioning of the workpiece and simulating the workpiece-fixed processing path taking account of the rigid transformation of the positioning of the workpiece in an iterative manner until the process variable reaches the target value; and
g) orienting the workpiece,
wherein the process variable is a ratio of running times of respective driving means of at least two machine axes and the target value is selectable.

2. The method according to claim 1 , wherein the rigid transformation comprises as a parameter at least one selected from the group consisting of a translatory offset and an orientation angle of the workpiece.

3. The method according to claim 1 , wherein the ratio of the running times of the driving means of the at least two machine axes is essentially equal to one.

4. The method according to claim 1 , characterized in that the modifying and simulating of step f) is iteratively performed up to at least three times for a selectable parameter of the rigid transformation.

5. The method according to claim 1 , wherein the target value is a result selected from the group consisting of a non-linear optimization, a Newton method, and an optimum of a least-square polynomial.

6. The method according to claim 5 , wherein the process variable determined in step d) is interpolation nodes for the result.

7. The method according to claim 1 , wherein a first parameter of the rigid transformation is modified in a first run and when the difference in the values between the process variable and its target value exceed a threshold value, a second parameter of the rigid transformation is modified in a second run.

8. The method according to claim 3 , wherein step c) is performed taking account of a boundary condition of a production machine along the machine axis, wherein the boundary condition is selected from the group consisting of a maximum length of travel, a maximum acceleration, a maximum jolt, and a maximum cutting speed of the tool.

9. A program which runs in a memory of a control unit of a production machine and is configured to output control instructions to driving means of machine axes, said program configured to:
a) provide a workpiece-fixed processing path for a machining of the workpiece;
b) select a rigid transformation of a positioning of the workpiece;
c) simulate the workpiece-fixed processing path taking account of the rigid transformation of the positioning of the workpiece;
d) determine a process variable of the machining of the workpiece;
e) determine a desired target value for the process variable; and
f) modify the rigid transformation of the positioning of the workpiece and simulate the workpiece-fixed processing path taking account of the rigid transformation of the positioning of the workpiece in an iterative manner until the process variable reaches the target value,
wherein the process variable is a ratio of running times of the driving means of the machine axes and the target value is selectable.

10. A control unit for controlling a driving means of a production machine, comprising a memory and an arithmetic unit for storing and executing a program configured to:
a) provide a workpiece-fixed processing path for a machining of the workpiece;
b) select a rigid transformation of a positioning of the workpiece;
c) simulate the workpiece-fixed processing path taking account of the rigid transformation of the positioning of the workpiece;
d) determine a process variable of the machining of the workpiece;
e) determine a desired target value for the process variable; and
f) modify the rigid transformation of the positioning of the workpiece and simulate the workpiece-fixed processing path taking account of the rigid transformation of the positioning of the workpiece in an iterative manner until the process variable reaches the target value,
wherein the process variable is a ratio of running times of the driving means of the machine axes and the target value is selectable.

11. A production machine which comprises a tool that can be moved in each case by a driving means along at least two machine axes, and a control unit having a memory which is configured to store and execute a program, said program configured to:
a) provide a workpiece-fixed processing path for a machining of the workpiece;
b) select a rigid transformation of a positioning of the workpiece;
c) simulate the workpiece-fixed processing path taking account of the rigid transformation of the positioning of the workpiece;
d) determine a process variable of the machining of the workpiece;
e) determine a desired target value for the process variable; and
f) modify the rigid transformation of the positioning of the workpiece and simulate the workpiece-fixed processing path taking account of the rigid transformation of the positioning of the workpiece in an iterative manner until the process variable reaches the target value,
wherein the process variable is a ratio of running times of the driving means of the machine axes and the target value is selectable.

Assignees

• Siemens Ag

Inventors

• Pitz Thomas
• Spielmann Ralf

Classifications

• G05B19/4086 Primary

  Coordinate conversions; Other special calculations · CPC title

• G05B2219/50052

  Orienting workpiece relative to tool · CPC title

• G05B2219/39361

  Minimize time-energy cost · CPC title

• G05B2219/50149

  Find orientation workpiece which maximizes number of faces machined in one setup · CPC title

• G05B2219/50148

  Workpiece, setup of component, workpiece · CPC title