Circular-Shank Tool Holder Centering via Segmented Stamped Edges
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Solution Overview
Problem
Existing round shank chisels with chisel holders face issues with axial play and centering, leading to hindered rotational movement due to insufficient guide faces and play in the circumferential groove.
Innovation Solution
The clamping sleeve features holding elements with punched edges oriented transversely, extending over a portion of the circumference, forming coaxial concave centering sections that match the groove width, reducing axial play and optimizing centering for smooth rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If holding elements are pushed inward in a point-like or strip-like manner, then the clamping sleeve can be manufactured simply, but axial play increases and centering is insufficient
Solution Approach 1:
The holding elements are segmented into multiple discrete elements distributed around the circumference of the clamping sleeve, each engaging with the circumferential groove of the shank. This segmentation allows each element to be punched or pressed inward independently through the wall thickness, providing both manufacturing simplicity and improved centering through distributed contact points that reduce axial play while maintaining ease of manufacture.
2Manufacturing precision
If holding elements are distributed over the circumference, then centering is improved, but the number of holding elements increases complexity
Solution Approach 1:
Multiple holding elements are merged into a single integrated clamping sleeve structure, where the holding elements are formed as integral parts of the sleeve wall rather than separate components. This combining approach provides distributed circumferential contact for improved centering while reducing overall device complexity by eliminating the need for separate holding element components and their associated assembly steps.
3Manufacturing precision
If holding elements engage the circumferential groove, then the shank is centered, but rotational movement is hampered due to insufficient guide faces
Solution Approach 1:
The holding elements exhibit local quality differentiation with distinct functional zones: one surface provides engagement with the circumferential groove for centering, while another surface provides smooth guide faces for rotational movement. This local quality variation allows the same holding element structure to simultaneously achieve precise centering through groove engagement while facilitating free rotation through smooth guiding surfaces that minimize friction.
Data Source
AI summary
A circular-shank tool including a tool holder for improving the centering of the shank of the circular-shank tool in the locking sleeve by a configuration of the retaining elements and to improve an ability of the shank to rotate in the sleeve. To achieve this, the retaining elements are distributed between two stamped edges that lie transversely with respect to a longitudinal axis of the locking sleeve and are stamped inwards or indented, the stamped edges extend over part of the circumference of the locking sleeve and are interspaced at a distance that corresponds to the width of the peripheral groove in the shank of the circular-shank tool and the retaining elements form a coaxial concave centering section facing the convex groove base of the peripheral groove.