Laser Cutter Path Detouring Around Cut Features
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Solution Overview
Problem
Laser cutter heads often collide with large or irregularly shaped features that do not fall through the support structure during cutting, leading to costly interruptions and inefficiencies due to the need for slow head-up/down movements.
Innovation Solution
The laser cutter is moved along detours by evaluating locations to determine if they are interior or exterior to a feature, using modified rendering techniques like rasterization or ray casting to identify these locations, and constructing a hierarchical nesting tree to guide the cutting order and avoid collisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the cutter head is moved rapidly laterally to maximize cutting efficiency, then productivity is improved, but the risk of collision with previously cut features increases
Solution Approach 1:
The system performs preliminary analysis of the pattern to identify all features and their spatial relationships before cutting begins. This pre-computed information is stored and used to guide the cutter head along safe paths, allowing rapid lateral movement without collision risk by anticipating potential obstacles before they are encountered.
Solution Approach 2:
A computational intermediary (the system that generates and processes the pattern information) acts as a mediator between the cutting path planning and the actual cutter head movement. This intermediary computes safe lateral paths by analyzing the pattern data, enabling the cutter head to move rapidly without direct real-time collision detection, thus maintaining both speed and safety.
2Reliability
If slow head-up/down movements are used to avoid collisions, then collision risk is reduced, but production time increases significantly
Solution Approach 1:
The system pre-computes the entire cutting pattern and identifies all features that require head-up/down movements before cutting begins. By having this information available in advance, the system can plan the cutting sequence to minimize or eliminate slow head-up/down movements, allowing the cutter head to maintain rapid lateral movement throughout the process while still avoiding collisions.
Solution Approach 2:
The system dynamically adjusts the cutting sequence based on the pre-analyzed pattern information, optimizing the order in which features are cut to maximize the use of rapid lateral movements and minimize the use of slow head-up/down movements. This dynamic sequencing maintains collision avoidance while improving overall production speed.
3Reliability
If bounding boxes are used to ensure cutter head does not cross feature boundaries, then collision avoidance is achieved, but material utilization efficiency decreases
Solution Approach 1:
Instead of applying a uniform bounding box constraint to all features, the system analyzes the local geometry and spatial relationships of each feature individually. This allows the cutter head to follow precise safe paths that adapt to the local characteristics of each feature, avoiding unnecessary restrictions and maximizing material utilization while still ensuring collision avoidance.
Solution Approach 2:
The system pre-analyzes the pattern to identify the exact geometry and position of all features before cutting begins. This preliminary information is used to compute optimized cutting paths that respect feature boundaries without requiring conservative bounding boxes, thereby improving material utilization efficiency while maintaining collision avoidance.
Data Source
AI summary
A path of a cutter head of a laser cutting machine is modified to cut features according to a pattern from a material. A no-travel zone that the laser cutter avoids while performing lateral movements between cuts is specified. Locations of the path that cross the no-travel zones are also specified. The path is then modified such that all locations that violate the no-travel zone are removed so that the laser cutter detours around the no-travel zone when performing the lateral movements.