Multi-Head CNC Toolpath Partitioning With Digital Twin Collision Checks

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Solution Overview

Problem

Existing part programming systems are inefficient for operating machines with multiple heads, leading to time-consuming operations and mismatches between CAM system calculations and actual machine parameters, affecting the predictability of CNC behavior.

Innovation Solution

A method and system for generating a work path for a CNC machine using a computer-aided manufacturing (CAM) system, which includes a CNC controller configured to receive CAD elements and generate precise tool trajectories, utilizing a digital twin model to emulate the machine's performance and distribute toolpaths among multiple heads, allowing for high-rate operation and reduced collision risks.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If multiple heads are used to increase production efficiency, then productivity increases, but programming complexity and collision detection difficulty increase

Engineering Contradiction:
Improveproduction efficiencyVSAvoidprogramming complexity
Core Design Contradiction:
ProductivityVSDevice complexity

Solution Approach 1:

The patent creates a digital twin (virtual copy) of the multi-head machine that includes accurate geometric models and kinematic parameters. This virtual model allows for offline simulation and verification of toolpaths without requiring complex real-time coordination programming, thus maintaining high productivity while reducing programming complexity.

Inventive Principle:
Principle #26Copying

Solution Approach 2:

The system performs preliminary collision detection and toolpath verification in the virtual environment before actual machining. By pre-simulating the behavior of multiple heads and detecting potential collisions offline, the system eliminates the need for complex real-time collision avoidance programming during production.

Inventive Principle:
Principle #10Preliminary action

2Speed

If multiple heads operate in close proximity to maintain high dynamic performance, then speed increases, but collision risk increases

Engineering Contradiction:
Improveoperating speedVSAvoidcollision risk
Core Design Contradiction:
SpeedVSReliability

Solution Approach 1:

The digital twin creates a virtual replica of the physical machine with precise geometric and kinematic models. This allows for safe, high-speed operation by pre-verifying toolpaths in the virtual environment, enabling heads to operate in close proximity without actual collision risk since conflicts are detected and resolved offline.

Inventive Principle:
Principle #26Copying

Solution Approach 2:

The system performs preliminary collision detection and prevents harmful interactions before they occur by simulating multi-head operations in the digital twin. Potential collisions are identified and resolved during offline programming, allowing high-speed operation with reduced collision risk during actual production.

Inventive Principle:
Principle #9Preliminary anti-action

3Loss of time

If CAM system calculations are simplified for faster processing, then programming speed increases, but accuracy of tool trajectory prediction decreases

Engineering Contradiction:
Improveprogramming timeVSAvoidtool trajectory accuracy
Core Design Contradiction:
Loss of timeVSManufacturing precision

Solution Approach 1:

The digital twin maintains accurate geometric models, kinematic parameters, and machining conditions in the virtual environment. This allows complex calculations to be performed offline on powerful computers without impacting production timing, thus maintaining high tool trajectory accuracy while enabling fast production cycles.

Inventive Principle:
Principle #26Copying

Solution Approach 2:

Accurate tool trajectory calculations and validations are performed preliminarily in the digital twin before production. By completing precise simulations offline, the system maintains manufacturing precision while enabling rapid production execution without repeated adjustments.

Inventive Principle:
Principle #10Preliminary action

Data Source

PatentEP4671887A1Methods and systems for operating a plurality of operating heads of an operating machine
Publication Date: 2025.12.31 PRIMA IND
  • EP4671887A1 patent drawingFigure 1
  • EP4671887A1 patent drawingFigure 2
  • EP4671887A1 patent drawingFigure 3

AI summary

A method of assigning a set of toolpaths (SCTFP) to a plurality of operating heads of an operating machine apparatus, the operating heads being displaceable within respective operating regions via a plurality of sub-systems of the operating machine apparatus (10). The method comprises: generating (400) a global toolpath (TP) based on a computerized object model (OB) provided via a computer-aided design, CAD processing stage (CP); based on respective operating regions and on a target travel time (CF), partitioning (402) the global toolpath (TP) and assigning toolpath partitions of a set of toolpath partitions (TP1, ..., TP4) to respective operating heads of the plurality of operating heads; providing a computerized machine model (DT) configured to emulate the dynamical behavior of the operating machine apparatus (10); emulating (402), via the computerized machine model (DT), the displacement of the operating heads according to the toolpath partitions (TP1, ..., TP4); based on the emulated displacement, detecting (404) collisions among operating heads; in response to detecting the presence of mutual collisions, adjusting and re-assigning toolpath partitions of the set of toolpath partitions (TP1, ..., TP4) to respective operating heads; in response to failing to detect the presence of mutual collisions, providing (406) the set of toolpath partitions (TP1, ..., TP4) as a set of collision-free toolpaths (CFTP1, ..., CFTP4; SCFTP) to the operating machine apparatus for driving the sub-systems to displace the plurality of operating heads accordingly.