Hydraulic Chuck Expansion Sleeve to Prevent Brazing Joint Cracks
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Solution Overview
Problem
Hydraulic chucks experience catastrophic failure due to pressure-induced cracks in soldering joints, leading to unreliable tool holding and potential tool damage.
Innovation Solution
The introduction of an expansion sleeve with a pressurized fluid chamber enclosed between integral inner and outer walls, which eliminates direct pressure on brazing joints and uses a front flange for secure attachment to a tool support member, allowing for pressure adjustment without compromising the integrity of the joint.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the sleeve is soldered in place to hold tool shanks, then the tool holding is secure, but pressure-induced cracks develop in the soldering over time causing catastrophic failure
Solution Approach 1:
The chuck is divided into separate functional components: the expansion sleeve (which contacts the tool shank) and the body (which contains the soldering joint). The expansion sleeve can be removed and replaced independently without affecting the permanent soldering joint in the body, thus preventing crack propagation to the critical soldered connection.
Solution Approach 2:
The expansion sleeve is extracted as a separate removable component from the body. The sleeve receives the tool shank and can be removed when cracks develop, while the body with its permanent soldering joint remains intact. This separates the wear-prone expansion element from the critical joint.
2Ease of repair
If the expansion sleeve is made as a separate removable component, then ease of repair is improved, but device complexity increases due to additional connection interfaces
Solution Approach 1:
The front flange and expansion sleeve are merged into a single integrally formed component. This simplifies the overall structure by reducing the number of separate parts and connection interfaces, while still allowing the entire flange-sleeve assembly to be removed and replaced as one unit when needed.
Solution Approach 2:
Instead of making the body removable from the sleeve, the invention inverts the approach by making the sleeve (with front flange) removable from the body. This inversion simplifies the design because the sleeve is the component that experiences wear and needs replacement, while the body contains the permanent soldering joint.
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 durability and reliability of hydraulic chucks by preventing pressure-induced cracking and allowing for easier replacement or repair of the expansion sleeve, thereby reducing the risk of tool failure and improving clamp stability.
Implementation Method 1
A pressurized member, such as a screw, communications with the oil to pressurize the oil when the screw is advanced. When the oil is pressurized, the sleeve clamps a tool shank.
Implementation Method 2
The expansion sleeves may be secured to the tool support member by brazing, mechanical fasteners, threading, or combinations thereof.
Data Source
AI summary
Expansion sleeves are disclosed comprising a body and a flange. The body may be generally cylindrical and includes an inner wall, an outer wall integrally formed with the inner wall, and a pressurized fluid chamber located radially between and encapsulated in the inner wall and the outer wall. The front flange extends radially outward from the outer wall of the body. The front flange may comprise a tool support connection structured and arranged to fasten the front flange to a tool support member. The tool support member may include a pressurized fluid system that communicates with the pressurized fluid chamber of the expansion sleeve. The expansion sleeves may be secured to the tool support member by mechanical fasteners, threading, or combinations thereof. During operation, pressurized fluid in the tool support member communicates with the pressurized fluid chamber of the expansion sleeve to clamp a tool shank.