Machine Tool-Holder Coupling With Radial Locking Against Detachment
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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 active safety and reliable operation.
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
Solution Approach 1:
The locking mechanism is divided into two independent parts: a magnetic fixing device for quick assembly/disassembly and a second axial locking element for secure positioning. This segmentation allows each component to perform its specialized function - the magnetic device provides ease of operation while the mechanical locking element ensures reliability under stress
Solution Approach 2:
The second axial locking element is preliminarily positioned to engage with the spindle before the tool-holder is fully assembled. This preliminary action creates a pre-locking mechanism that prevents detachment even when the magnetic fixing device is later removed or fails under high transverse stresses
2Device complexity
If only a magnetic fixing device is used, then the structure remains simple, but the tool-holder becomes unsafe under high transverse stresses
Solution Approach 1:
The second axial locking element serves as a preliminary safety cushion against tool detachment. It is positioned and configured to engage beforehand, creating a backup mechanism that cushions against the harmful effect of tool detachment under high transverse stresses, thereby reducing safety hazards without significantly increasing structural 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 stability and safety, even under sudden or increased transverse stresses, thereby ensuring accurate machining and reducing the risk of machinery and material damage.
Implementation Method 1
a magnetic coupling device provided with elements cooperating in abutment relationship to make the tool-holder and the spindle rotationally integral with each other
Implementation Method 2
at least a second axial locking element of the tool-holder, configured to removably lock in translation and in a substantially axial direction the tool-holder in the spindle
Data Source
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AI summary
The invention relates to a tool-holder unit (10) of a machine (100) for machining block or slab materials (200), the tool-holder unit (10) being moveable above a working plane (102) of said machine (100) on which the block or slab material (200) to be machined is laid, wherein the tool-holder unit (10) comprises: a spindle (12) on which a circular blade (11) can be mounted, and a coupling assembly (61) for removably coupling a second machining tool (28, 128) to a front free end (12a) of the spindle (12), comprising: a) a tool-holder (50) associated to the second machining tool (28, 128); b) at least one mechanical coupling device (63) provided with elements cooperating in abutment relationship (58, 68) to make the tool-holder (50) and the spindle (12) rotationally integral with each other; and c) a first axial locking element of the tool-holder (50) of the magnetic type, configured to removably lock in translation and in a substantially axial direction said tool-holder (50) on the spindle (12), d) a substantially cylindrical shank (57a) extending from said free end of the tool-holder (50); e) a substantially cylindrical housing seat (67a) of said shank (57a), axially positioned in said spindle (12) or, if present, in a tool-holder coupling element (60) associated to the front free end (12a) of the spindle (12); and f) at least a second axial locking element (70) of the tool-holder (50), configured to removably lock in translation and in a substantially axial direction the tool-holder (50) in the spindle (12), the axial locking element (70) being translationally movable in the radial direction to removably lock the shank (57a) in the respective housing seat (67a).