Expansion Chucking Device Thin Wall Pressure Reinforcement
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Solution Overview
Problem
Existing expansion clamping devices face issues with soldering points breaking due to alternating loads, and while form-fitting connections can absorb radial forces, they increase processing effort and may not provide a secure connection without additional engagement.
Innovation Solution
The expansion sleeve features a radially outward collar soldered to a base body shoulder with a radial depression forming a thin wall that is pressed against the soldered connection area by pressure, creating a secure connection without form-fitting engagement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the expansion sleeve is soldered to the base body at axial end regions to form a closed pressure chamber, then a firm connection is established, but the soldering points are subjected to severe stresses from alternating loads which can lead to breaking
Solution Approach 1:
The patent introduces a radial depression with a thin wall structure localized adjacent to the soldered connection area. This thin wall is pressed elastically against the connection area by pressure chamber pressure, creating a localized reinforcement zone that protects the soldering point from radial stresses without requiring form-fitting engagement throughout the entire connection area.
2Reliability
If form-fitting connections are added to the soldered areas to absorb radial forces, then connection security is improved, but processing effort and complexity increase
Solution Approach 1:
The patent extracts the force-absorbing function from the main connection area and relocates it to the thin wall structure formed by the radial depression. This separate, localized structure handles radial forces independently, allowing the primary soldered connection to remain simple while still achieving secure force absorption without complex form-fitting engagement.
3Ease of manufacture
If the expansion sleeve is designed without form-fitting engagement to simplify manufacturing, then ease of manufacture is improved, but connection security may be insufficient under alternating loads
Solution Approach 1:
The thin wall structure formed by the radial depression acts as an intermediary element between the pressure chamber pressure and the soldered connection area. It mediates the transmission of forces by being pressed elastically against the connection area, thereby reinforcing the simple soldered connection without requiring complex form-fitting engagement.
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 the security of the connection between the expansion sleeve and base body, protecting the soldering points from damage by distributing pressure forces effectively, thus ensuring a reliable clamping mechanism.
Implementation Method 1
the pressure chamber can be acted upon by a hydraulic medium with elastic deformation of the expansion sleeve in order to achieve a clamping effect
Implementation Method 2
a thin wall is formed between the depression and the connection area, which at least at its end on the pressure chamber side passes through a pressure prevailing in the depression is pressed elastically against the soldered connection area
Data Source
Figure 1~5
Figure 6~10
AI summary
The tool e.g. expansion chuck, has an expanding bushing (5) including a radially outwardly extending flange at an end region of the bushing in proximity of a work spindle of a machine tool. A recess (13) is formed adjacent to a connection region (L) in a base body (2) and radially opens towards a pressure chamber. The recess is formed and/or positioned such that a thin wall (14) is formed between the recess and the connection region. An end of the thin wall at a pressure chamber side is elastically compressed against the connection region by pressure obtained in the recess.