Generating optimized tool paths and machine commands for beam cutting tools
View Patent ↗A facility for automated modelling of the cutting process for a particular material to be cut by a beam cutting tool, such as a waterjet cutting system, from empirical data to predict aspects of the waterjet's effect on the workpiece across a range of material thicknesses, across a range of cutting geometries, and across a range of cutting quality levels, all of which may be broader than, and independent of the actual requirements for a target workpiece, is described.
1. One or more computer memories collectively storing:
a waterjet cutting model data structure comprising information specifying a cutting model for a distinguished workpiece material that, for each of one or more aspects of a waterjet's effect on a workpiece of the distinguished material, specifies a relation adapted to predict the value of the aspect based on the value of one or more independent variables across a range of at least one of material thicknesses, cutting geometries, and cutting quality levels, wherein one of the aspects is jetlag distance, wherein the information further comprises:
for each of the one or more aspects of a waterjet's effect on a workpiece:
values of each of a plurality of function coefficients that, together with a functional form established for the aspect, constitutes a relation adapted to predict the value of the aspect based on the value of one or more independent variables, wherein the functional form established for the jetlag distance aspect is parabolic; and
contents whose execution by one or more processors causes the one or more processors to:
cause generation of at least one of waterjet cutting tool paths and waterjet cutting tool machine commands for waterjet cutting projects cutting the distinguished material based, at least in part, on the data structure; and
cause the generated at least one of waterjet cutting tool paths and waterjet cutting tool machine commands to be used to perform a cutting project.
2. The computer memories of claim 1 wherein the information specifying a cutting model specifies, for each of the one or more aspects of a waterjet's effect on a workpiece of the distinguished material, a relation adapted to predict the value of the aspect based on the value of one or more independent variables across a range of each of material thicknesses, cutting geometries, operation parameters, and cutting quality levels.
3. A method in a computing system for generating a tool path to cause a waterjet cutting tool to plan a first cutting project on a workpiece of a distinguished material and a second cutting project on a workpiece of the distinguished material, the method comprising:
accessing a definition of the first cutting project specifying a workpiece thickness, a cutting geometry, and a cutting quality level;
accessing a definition of the second cutting project specifying a workpiece thickness, a cutting geometry, and a cutting quality level, wherein at least one of the workpiece thickness, cutting geometry, and cutting quality level specified by the definition of the second cutting project differs from the workpiece thickness, cutting geometry, and cutting quality level specified by the definition of the first cutting project;
accessing a cutting model for the distinguished material that, for each of one or more aspects of a waterjet's effect on a workpiece of the distinguished material, specifies a relation adapted to predict the value of the aspect based on the value of one or more independent variables;
using the accessed cutting model to generate a tool path for the first cutting project;
using the accessed cutting model to generate a tool path for the second cutting project, wherein the accessed cutting model is unchanged between generating the tool path for the first cutting project in generating the tool path for the second cutting project;
causing the tool path generated for the first cutting project to be used to perform the first cutting project; and
causing the tool path generated for the second cutting project to be used to perform the second cutting project.
4. The method of claim 3 , further comprising interpolating the tool path generated for the first cutting project to obtain waterjet cutting tool machine commands for the first cutting project.
5. The method of claim 3 , wherein the workpiece thickness specified by the definition of the second cutting project differs from the workpiece thickness specified by the definition of the first cutting project.
6. The method of claim 3 , wherein the cutting geometry specified by the definition of the second cutting project differs from the cutting geometry specified by the definition of the first cutting project.
7. The method of claim 3 , wherein the quality level specified by the definition of the second cutting project differs from the quality level specified by the definition of the first cutting project.
8. The computer memories of claim 1 wherein one of the independent variables is depth.
9. The computer memories of claim 1 wherein one of the independent variables is cutting speed.
10. The computer memories of claim 1 wherein one of the aspects is taper distance.
11. The computer memories of claim 1 wherein one of the aspects is separation speed.
12. The computer memories of claim 1 wherein one of the aspects is a function of separation speed.
13. The computer memories of claim 1 wherein at least one of the aspects depends on one or more operating parameters of the waterjet, and is independent of any details of a cutting project other than material type.
14. The computer memories of claim 1 wherein at least one of the aspects depends on one or more details of a cutting project beyond material type.
15. A computer-readable medium having contents configured to cause a computing system to perform a method for generating a tool path to cause a waterjet cutting tool to plan a first cutting project on a workpiece of a distinguished material and a second cutting project on a workpiece of the distinguished material, the method comprising:
accessing a definition of the first cutting project specifying a workpiece thickness, a cutting geometry, and a cutting quality level;
accessing a definition of the second cutting project specifying a workpiece thickness, a cutting geometry, and a cutting quality level, wherein at least one of the workpiece thickness, cutting geometry, and cutting quality level specified by the definition of the second cutting project differs from the workpiece thickness, cutting geometry, and cutting quality level specified by the definition of the first cutting project;
accessing a cutting model for the distinguished material that, for each of one or more aspects of a waterjet's effect on a workpiece of the distinguished material, specifies a relation adapted to predict the value of the aspect based on the value of one or more independent variables;
using the accessed cutting model to generate a tool path for the first cutting project;
using the accessed cutting model to generate a tool path for the second cutting project, wherein the accessed cutting model is unchanged between generating the tool path for the first cutting project in generating the tool path for the second cutting project;
causing the tool path generated for the first cutting project to be used to perform the first cutting project; and
causing the tool path generated for the second cutting project to be used to perform the second cutting project.
16. The computer-readable medium of claim 15 , the method further comprising interpolating the tool path generated for the first cutting project to obtain waterjet cutting tool machine commands for the first cutting project.
17. The computer-readable medium of claim 15 , wherein the workpiece thickness specified by the definition of the second cutting project differs from the workpiece thickness specified by the definition of the first cutting project.
18. The computer-readable medium of claim 15 , wherein the cutting geometry specified by the definition of the second cutting project differs from the cutting geometry specified by the definition of the first cutting project.
19. The computer-readable medium of claim 15 , wherein the quality level specified by the definition of the second cutting project differs from the quality level specified by the definition of the first cutting project.