Machine Tool-Holder Coupling With Secondary Axial Locking
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Solution Overview
Problem
Existing machine tool-holder units for machining block or slab materials, such as stone, face issues with tool detachment due to high transverse stresses during operations like milling, leading to eccentric rotation, vibrations, and potential safety hazards.
Innovation Solution
The tool-holder unit incorporates a second axial locking element that is translationally movable in a radial direction to securely lock the tool-holder onto the spindle, preventing detachment even under high transverse stresses, ensuring safe and accurate machining operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a magnetic fixing device is used to couple the tool-holder to the spindle, then the tool-holder can be quickly assembled and disassembled, but the tool-holder may detach under high transverse stresses during machining operations
Solution Approach 1:
The coupling assembly is divided into multiple independent locking elements: a first axial locking element (magnetic fixing device) for quick assembly/disassembly, and a second axial locking element (mechanical locking device) for preventing detachment under stress. These segmented locking mechanisms work together to resolve the contradiction between ease of operation and reliability.
Solution Approach 2:
The mechanical locking device is pre-configured with locking surfaces and locking elements that engage before machining operations begin. This preliminary mechanical engagement ensures the tool-holder is securely attached before transverse stresses occur during milling operations, preventing detachment while maintaining easy assembly through the magnetic device.
2Reliability
If the tool-holder is securely locked to prevent detachment, then operational safety is improved, but the complexity of the coupling assembly increases
Solution Approach 1:
The coupling assembly merges two different locking mechanisms (magnetic and mechanical) into a single integrated system. The magnetic fixing device and mechanical locking device are combined in the tool-holder, allowing both easy assembly and secure attachment without requiring separate systems. This merging reduces overall system complexity while maintaining high reliability.
Solution Approach 2:
The coupling assembly is designed with multi-functionality: the first axial locking element provides magnetic fixing for quick assembly, while the second axial locking element provides mechanical locking for stress resistance. This universal design allows a single coupling assembly to perform multiple functions (easy assembly, secure attachment, detachment prevention) without increasing complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively prevents accidental detachment of the tool-holder during machining, maintaining operational safety and precision by securely locking the tool-holder in place under various stress conditions, including sudden transverse forces.
Implementation Method 1
a first axial locking element of the tool-holder configured to removably lock in translation and in a substantially axial direction said tool-holder on the spindle, said first axial locking element comprising a magnetic fixing device of the tool-holder to the spindle
Data Source
AI summary
A tool-holder unit for machining block or slab materials is moveable above a working plane on which the block or slab material is laid. The tool-holder unit includes a spindle with a circular blade and a coupling assembly that couples a second machining tool with the spindle. The tool-unit further includes a tool-holder; a mechanical coupling device configured to rotationally integrate the tool-holder and the spindle; a first axial locking element configured to removably lock the tool-holder on the spindle; a substantially cylindrical shank extending from the tool-holder; a substantially cylindrical housing seat axially positioned in the spindle or a tool-holder coupling element; and a second axial locking element configured to removably lock the tool-holder in the spindle, the axial locking element being configured to removably lock the shank in the respective housing seat.