Modular Tool-Changing Arm for Machining Centre
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Solution Overview
Problem
Existing tool-changing systems in machining centers for wood are inefficient, requiring excessive time for tool changes and being inflexible with various tool magazines, occupying valuable space, and having a high mass due to integration with the operating unit.
Innovation Solution
A modular tool-changing system that operates independently of the operating unit, allowing tool changes during normal operation, with a tool-changing arm and shuttle that can rotate and move vertically to access tools from different orientations, reducing stress on guide means and adapting to various tool magazine types.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the tool-changing system is integrated with the operating unit, then the system is compact, but the mass increases and occupies crosspiece zone
Solution Approach 1:
The tool-changing system is divided into separate components: the tool-changing arm is mounted on the crosspiece while the operating unit remains independent. This segmentation allows the tool-changing function to be performed without integrating the entire system, reducing the mass that must be moved with the operating unit while maintaining compact space utilization through coordinated movement of separate components.
2Device complexity
If the tool-changing system operates only when the operating unit stops, then the system is simple, but the tool change time increases
Solution Approach 1:
The tool-changing arm can preliminarily prepare the next tool by positioning it in readiness during the time the operating unit is still processing the current workpiece. When the operating unit completes its operation and moves to the tool-changing position, the tool change can occur rapidly because the tool is already prepared and positioned, thus reducing overall tool change time without requiring complex synchronized control systems.
3Stress or pressure
If the tool magazine is positioned far from the guide means, then the guide means experiences less stress, but the tool-changing system occupies more space
Solution Approach 1:
The tool magazine is positioned at the end of the crosspiece along the Y-axis, utilizing the longitudinal dimension of the crosspiece structure. This arrangement allows the tool magazine to be located far from the guide means (reducing stress on guides) while maintaining compact overall footprint by efficiently using the available longitudinal space of the crosspiece rather than expanding the lateral footprint.
4Adaptability or versatility
If the tool-changing arm can access magazine from various orientations, then the system is versatile, but the mechanism becomes more complex
Solution Approach 1:
The tool-changing arm is designed with rotational capability around a vertical axis, making it a dynamic mechanism that can orient itself toward the tool magazine from different directions. This dynamic positioning ability allows the system to work with various tool magazine configurations and orientations without requiring multiple fixed-position tool-changing mechanisms, achieving versatility through controlled movement rather than mechanical complexity.
Data Source
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AI summary
A machining centre (1), for machining wood or material similar to wood, comprises a movable operating unit (5), which can use various tools interchangageably, and a tool-changing system having a shuttle (15) that removes a tool from a tool magazine (6) and brings the tool to a tool-changing arm (10) that is reachable by the operating unit.