Bayonet Cutting Head Coupling With Axial Support for High Torque
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing cutting tools with bayonet connections suffer from bending stress due to the lever-like effect, which can lead to material failure and are not suitable for transmitting high torques.
Innovation Solution
A cutting tool design featuring axially undercut protrusion sections on both the cutting head and the cutting head driver, allowing for a positive bayonet closure that reduces bending stress through axial support and frictional forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a bayonet connection is used to connect the cutting head and cutting head driver, then the connection provides torque transmission and axial fixation, but bending stress is induced due to the lever-like effect which can lead to material failure
Solution Approach 1:
The invention introduces a new dimension to the connection by adding axial undercutting to the bayonet connection's radial engagement. The undercutting creates axial interference that generates friction forces and normal forces perpendicular to the original lever arm, effectively adding a dimensional constraint that reduces bending stress in the radial plane.
Solution Approach 2:
The invention introduces friction forces as an intermediary mechanism between the cutting head and cutting head driver. The axial undercutting creates contact surfaces that generate friction forces, which act as a mediator to distribute and reduce the bending stress that would otherwise concentrate at the bayonet connection points.
2Reliability
If the cutting head and cutting head driver are made of different materials (hard metal and steel), then wear resistance and strength are optimized, but the bayonet connection becomes more susceptible to damage due to material incompatibility under bending stress
Solution Approach 1:
The invention changes the connection parameters by introducing axial undercutting depth and angle as new design variables. This modification alters the stress distribution parameters at the interface between different materials, reducing the bending stress concentration that would otherwise cause damage at the material junction.
3Ease of manufacture
If traditional bayonet connection geometry is used, then the structure is simple and easy to manufacture, but the connection cannot withstand high torques without inducing excessive bending stress
Solution Approach 1:
The invention segments the connection function into two distinct mechanisms: the bayonet connection provides torque transmission through radial engagement, while the axial undercutting provides stress reduction through friction and normal forces. This segmentation allows each mechanism to optimize its specific function without compromising the other.
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
The design effectively reduces bending stress and enhances the cutting tool's ability to withstand high forces without risking damage or premature wear, while maintaining a secure connection.
Implementation Method 1
reduces bending stress through axial support and frictional forces
Data Source
AI summary
A cutting tool (2) for machining workpieces includes a cutting head (10) and a cutting head driver (12) which can be connected to the cutting head (10). The cutting head (10) and the cutting head driver (12) have respective main parts (14, 24), from the end face of which a protruding section (16, 26) that has an undercut in the axial direction protrudes axially, each protruding section having a torque-transmitting surface (18, 28) which are designed to complement each other, are positioned in a preferably axial manner, and rest against each other in the connected state, wherein the protruding sections (16, 26) are dimensioned such that the end face (20) of the protruding section (16) of the cutting head (10) rests against the end face (32) of the main part (24) of the cutting head driver (12) in the axial direction in the connected state.