Tool Holder Clamping Structure for Concentricity and Axial Retention
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Solution Overview
Problem
Existing tool holders face challenges in achieving high concentricity and stable fastening of tools while preventing axial and radial movements, often leading to tool deformation or damage due to frictional clamping, and are complex to produce.
Innovation Solution
A tool holder with a deformable receptacle featuring two clamping sections and a blocking element arranged between them, positioned on a radially offset support surface, which engages with corresponding counter-elements on the tool to prevent unwanted movement without direct contact, allowing for frictional clamping and simplified manufacturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If blocking elements are arranged within the clamping sections of the receptacle, then axial migration of the tool is prevented, but the tool shank or receptacle opening is damaged due to repeated pressure during clamping
Solution Approach 1:
The blocking elements are relocated from the radial dimension (within clamping sections) to the axial dimension (between clamping sections on a radially offset support surface). This dimensional shift allows the blocking elements to prevent axial migration without interfering with the radial clamping force application, thereby eliminating damage to the tool shank or receptacle opening.
2Strength
If frictional clamping is achieved by narrowing the receptacle opening, then the tool is clamped securely, but blocking elements are forced against the tool causing deformation and tilting
Solution Approach 1:
The receptacle is segmented into distinct functional zones: clamping sections for applying radial clamping force and a radially offset support surface for housing blocking elements. This segmentation separates the clamping function from the positioning function, allowing each to operate independently without causing deformation to the tool or blocking elements.
3Reliability
If blocking elements are positioned within the clamping surfaces, then axial movement is prevented, but the chuck membrane or sensitive locations are damaged
Solution Approach 1:
The radially offset support surface acts as an intermediary structure that houses the blocking elements separately from the clamping surfaces. This intermediary positioning allows the blocking elements to perform their axial prevention function while being isolated from the sensitive chuck membrane and other sensitive locations, preventing damage.
4Reliability
If the receptacle design includes blocking elements within clamping sections, then tool fastening is achieved, but the manufacturing complexity increases
Solution Approach 1:
By positioning blocking elements on a radially offset support surface rather than within the clamping sections, the design simplifies manufacturing. The offset positioning allows for easier integration of blocking elements during production and eliminates the need for complex internal features within the clamping sections, reducing overall manufacturing complexity while maintaining tool fastening stability.
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
This design enhances tool concentricity and stability by preventing axial and radial movements without tool deformation, while being easier to produce and maintain, and reduces vibration through the offset support surface.
Implementation Method 1
The tool can be tightened particularly firmly relative to being introduced in the receptacle via the two spaced clamping sections of the receptacle in the form of a force-fit
Implementation Method 2
at least one blocking element which is designed to engage in a corresponding counter-element on the tool to prevent axial migration of the tool
Data Source
AI summary
A tool holder includes a main body, a deformable receptacle for clamping a tool, and at least one blocking element which, in order to prevent axial migration of the tool out of the tool holder, is configured to engage in a corresponding counterpart element on the tool and is arranged at the receptacle. In order to allow particularly high concentricity of the tool holder and stable fastening of the clamped-in tool, and at the same time to ensure easy production, the receptacle has two spaced-apart clamping portions, between which the at least one blocking element is arranged.