Interference Checking Device

• US 20050283270A1
• Filed: 06/16/2005
• Published: 12/22/2005
• Est. Priority Date: 06/17/2004
• Status: Active Grant

• Current Assignee: MORI Seiki Company Limited
• Original Assignee: MORI Seiki Company Limited
• Inventors: Nakamura, Takayuki
• Granted Patent: US 7,251,543 B2
• Time in Patent Office: Days
• US Class Current: 700/178
• CPC Class Codes: G05B 19/4069 Simulating machining process on screen G05B19/4068 takes precedence
• CPC Class Codes: G05B 2219/35314 Display workpiece and machine, chuck, jig, clamp, tool
• CPC Class Codes: G05B 2219/35316 Interference checking between tool, machine, part, chuck, machining range
• CPC Class Codes: G05B 2219/35318 3-D display of workpiece, workspace, tool track
• CPC Class Codes: G05B 2219/35324 Two, more pictures separated on screen, display
• CPC Class Codes: G05B 2219/35333 Display raw material, blank, tool locus, workpiece, alarm if error

Abstract

Interference checking device including: a modeling database that stores data for three-dimensional modeling of tools, workpieces, and machine-tool constituting structures; an interference data memory for storing interference data defining inter-component interference relationships among the tool, the workpiece, and the structures; and an interference checking processor that, based on structure movement commands sent from a program analyzer for the machine tool, and on data stored in the modeling database and interference data memory, determines whether the tool, the workpiece, and the structures will interfere with each other. Movement commands in a block at least one block succeeding the block being executed in order to control the drive mechanisms that move the structures are sent from the program analyzer to the interference checking processor.

Claims

1. For a machine tool furnished with a plurality of structures including at least tool- and workpiece-holding structures, with drive mechanisms for driving structures, among said plurality of structures, equipped to be movable, and with a controller having an analytical processor for sequentially analyzing a machining program block by block and extracting at least movement commands involving the movable structures, and having a control execution processor for executing the machining program blocks by generating control signals based on the movement commands sequentially extracted by the analytical processor and controlling operation of the drive mechanisms based on the generated control signals, an interference checking device for ascertaining whether, due to movement by the movable structures when driven by the drive mechanisms and operationally controlled by the controller, the movable structures themselves, the other structures apart from the movable structures, or tools and workpieces held by the tool- and workpiece-holding structures, will interfere with each other, the interference checking device comprising:

a modeling data memory for storing three-dimensional modeling data constituted to include at least shape data defining the three-dimensional shape of each structure in the plurality of structures and the three-dimensional shapes of the tools and workpieces held by the tool- and workpiece-holding structures, and storing information related to axes of travel and/or axes of rotation established for said structures, tools, and workpieces;

an interference data memory for storing interference data defining inter-component interference relationships among said structures, tools, and workpieces; and

an interference determination processor for

sequentially receiving from the analytical processor movement commands in a block at least one block succeeding the block being executed in the control execution processor of the controller,

generating, based on the received movement commands and the three-dimensional modeling data stored in the modeling data memory, data three-dimensionally modeling the states into which the structures involving the movement commands in said succeeding block would be moved;

determining, based on the generated three-dimensional modeling data and on the interference data stored in the interference data memory, whether, by the movement of said structures involving said succeeding-block movement commands, said structures themselves, other structures apart from said structures, or the tools and workpieces held by the tool- and workpiece-holding structures will interfere with each other; and

updating the three-dimensional modeling data stored in the modeling data memory with the generated three-dimensional modeling data.

3. An interference checking device according to claim 1, wherein said interference determination processor outputs an alarm if said interference determination processor has determined that any of said structures or the tools and workpieces held by the tool- and workpiece-holding structures will interfere with each other.

5. The interference checking device according to claim 1, further comprising an image display device, wherein:

based on the movement commands, and on the three-dimensional modeling data stored in the modeling data memory, the interference determination processor sequentially generates data three-dimensionally modeling the states into which said structures involving said succeeding-block movement commands would be moved in a graduated manner, and sequentially generates corresponding three-dimensional image data; and

the three-dimensional images generated from the start to the end of the movement based on said succeeding-block movement commands are displayed sequentially on the image display device.

2. For a machine tool furnished with a plurality of structures including at least tool- and workpiece-holding structures, with drive mechanisms for driving structures, among said plurality of structures, equipped to be movable, and with a controller having an analytical processor for sequentially analyzing a machining program block by block and extracting at least movement commands involving the movable structures, and having a control execution processor for executing the machining program blocks by generating control signals based on the movement commands sequentially extracted by the analytical processor and controlling operation of the drive mechanisms based on the generated control signals, an interference checking device for ascertaining whether, due to movement by the movable structures when driven by the drive mechanisms and operationally controlled by the controller, the movable structures themselves, the other structures apart from the movable structures, or tools and workpieces held by the tool- and workpiece-holding structures, will interfere with each other, the interference checking device comprising:

a modeling data memory for storing three-dimensional modeling data constituted to include at least shape data defining the three-dimensional shape of each structure in the plurality of structures and the three-dimensional shapes of the tools and workpieces held by the tool- and workpiece-holding structures, and storing information related to axes of travel and/or axes of rotation established for said structures, tools, and workpieces;

an interference data memory for storing interference data defining inter-component interference relationships among said structures, tools, and workpieces; and

an interference determination processor for

sequentially analyzing the machining program block by block and extracting movement commands in a block at least one block succeeding the block being executed in the control execution processor of the controller;

generating, based on the received movement commands and the three-dimensional modeling data stored in the modeling data memory, data three-dimensionally modeling the states into which the structures involving the movement commands in said succeeding block would be moved;

determining, based on the generated three-dimensional modeling data and on the interference data stored in the interference data memory, whether, by the movement of said structures involving said succeeding-block movement commands, said structures themselves, other structures apart from said structures, or the tools and workpieces held by the tool- and workpiece-holding structures will interfere with each other; and

updating the three-dimensional modeling data stored in the modeling data memory with the generated three-dimensional modeling data.

4. An interference checking device according to claim 2, wherein said interference determination processor outputs an alarm if said interference determination processor has determined that any of said structures or the tools and workpieces held by the tool- and workpiece-holding structures will interfere with each other.

6. The interference checking device according to claim 2, further comprising an image display device, wherein:

based on the movement commands, and on the three-dimensional modeling data stored in the modeling data memory, the interference determination processor sequentially generates data three-dimensionally modeling the states into which said structures involving said succeeding-block movement commands would be moved in a graduated manner, and sequentially generates corresponding three-dimensional image data; and

the three-dimensional images generated from the start to the end of the movement based on said succeeding-block movement commands are displayed sequentially on the image display device.