Hardened Microrelief Clamping Surface for High Torque Transmission
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing force-fitting clamping connections experience a reduction in friction coefficient value during dynamic stress or re-clamping, leading to potential slippage and the need for post-machining or component replacement, especially under high loads.
Innovation Solution
A clamping connection with a first metal clamping surface featuring a hardened fine surface structure with microreliefs and microdepressions, and a second metal clamping surface of lower hardness, maintaining a high friction coefficient value by forming microtoothing upon clamping, which is resistant to surface roughness reduction and sticking effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If sand-blasting or friction-increasing coatings are applied to clamping surfaces, then the friction coefficient value increases, but the friction coefficient value is reduced in the event of release and re-clamping or dynamic stress
Solution Approach 1:
The invention changes the physical state of the clamping surface by hardening it through heat treatment or cold working, creating a hardened layer with microreliefs that permanently maintains high friction coefficient values even after release and re-clamping operations
Solution Approach 2:
The clamping surface is preliminarily treated by hardening and forming microreliefs before the actual clamping operation, ensuring that the high friction coefficient is already established and will be maintained throughout the service life of the connection
2Reliability
If the first clamping surface is hardened to maintain microreliefs, then the friction coefficient is permanently maintained, but the second clamping surface must have lower hardness to allow microtoothing formation
Solution Approach 1:
The invention applies different hardness properties to different clamping surfaces - the first clamping surface is hardened to maintain microreliefs while the second clamping surface remains softer to allow microtoothing formation, with each surface optimized for its specific function
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
Permanently maintains a high friction coefficient value between 0.20 to 0.5, enabling reliable transmission of high transverse forces and torques without the need for post-machining or component replacement, suitable for applications like flange connections.
Implementation Method 1
the microreliefs of the first clamping surface sink into the second clamping surface, thereby producing a so-called microtoothing
Implementation Method 2
a high friction coefficient value in the range from 0.20 to 0.5 can be permanently maintained
Data Source
AI summary
A force-fitting clamping connection includes a first metal clamping surface, a second metal clamping surface, and a clamping element for clamping the clamping surfaces against one another. The first clamping surface forms a hardened fine surface structure with microreliefs and microdepressions. The second clamping surface has a lower hardness than the first clamping surface. Preferably, the first clamping surface is surface-treated by sand-blasting, shot-blasting or embossing before the hardening operation. This allows permanently high friction coefficient values between the clamping surfaces. A flange connection includes such a clamping connection for transmitting high torques.