Two-Sleeve Shrink-Fit Chuck for Vibration-Resistant Clamping
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Clamping feed systems, particularly those used in high-speed metal machining, face challenges in applying large clamping forces while minimizing vibrations, which can impair machining quality due to the rigidity of the tool and its interaction with the workpiece.
Innovation Solution
A tool span feed system featuring a two-layer sleeve area composed of an inner and outer sleeve made of different metals, connected without play, which reduces vibration transmission through frictional contact and axial support, enhancing damping and stiffness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a shrink-fit chuck applies high clamping forces to hold the tool rigidly, then the tool stability and machining precision are improved, but harmful vibrations and torsional oscillations increase
Solution Approach 1:
The sleeve area is divided into an inner sleeve and an outer sleeve that are pressed together to form a composite structure. This segmentation allows the system to maintain high clamping forces while introducing damping characteristics through the interaction between the two sleeve components, thereby reducing vibrations during high-speed machining.
2Manufacturing precision
If the tool shaft is designed with high bending stiffness to ensure accurate geometry, then the geometric accuracy is improved, but the tool becomes more susceptible to vibrations during operation
Solution Approach 1:
The shrink-fit chuck employs a composite structure consisting of an inner sleeve and an outer sleeve made of different materials. This composite design combines the high stiffness required for geometric accuracy with the damping properties of the material combination, effectively reducing vibrations while maintaining the tool shaft's ability to produce accurate geometry.
3Strength
If the inner sleeve and outer sleeve are pressed together tightly to increase clamping force, then the tool holding strength is improved, but the vibration transmission between components increases
Solution Approach 1:
The interface between the inner sleeve and outer sleeve acts as an intermediary damping element. The frictional contact and potential micro-slipping at this interface serve to dissipate vibrational energy while still maintaining the necessary clamping force for secure tool holding, thus converting harmful vibration transmission into useful damping action.
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
Significantly reduces the inclination of the tool span feed to harmful vibrations, ensuring precise geometry and improved machining quality by effectively damping torsional and operational vibrations during high-speed metal cutting.
Implementation Method 1
Not least when metal meets metal, damping or reduced ability to transfer vibrations occurs.
Implementation Method 2
This design makes a significant reduction in the inclination of the tool span feed to harmful vibrations.
Implementation Method 3
Furthermore, an axial support of the outer sleeve on the tensioning feed base can also be carried out, which can be realized, for example, by a fastening flange on the outer sleeve and a complementary ring shoulder on the tensioning feed base
Data Source
Figure 1
Figure 2
Figure 3~3a
AI summary
The invention relates to chucks for clamping tools having a tool shank. This chuck provides a sleeve section (4) open at its free end, preferably made of an electrically conductive material, which forms a tool receptacle (5) for frictionally securing the tool shank in a press fit by shrinking. The chuck is characterized in that the sleeve section (4) – preferably at least over the entire axial length of the tool receptacle (5) – consists of an inner sleeve (7) and an outer sleeve (8) which receives the inner sleeve in the ready-for-use state and is joined to it without play. The outer sleeve (8) is preferably also made of an electrically conductive material.