Replaceable Cutting Head Coupling to Reduce Clamping Surface Wear
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Solution Overview
Problem
The internal clamping surfaces on the coupling legs of rotary cutting tools experience deformation and wear due to the press fit engagement with harder cutting heads, leading to reduced clamping force and necessitating premature tool body replacement.
Innovation Solution
A method involving a force-applying implement that presses the coupling legs radially outward before rotating the cutting head into or out of engagement, reducing contact forces and allowing for increased elastic deflection, thereby minimizing deformation and extending the tool body's lifespan.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the cutting head is made of harder material than the tool body, then the cutting head becomes more wear-resistant, but the internal clamping surfaces on the coupling legs experience deformation and wear, reducing tool body lifespan
Solution Approach 1:
The method applies preliminary action by pressing the coupling legs radially outward before the cutting head engagement rotation occurs. This pre-positioning of the coupling legs reduces contact forces during the subsequent engagement process, thereby minimizing deformation of the internal clamping surfaces while maintaining the wear-resistant properties of the harder cutting head material.
2Manufacturing precision
If the coupling legs are pressed radially outward during cutting head replacement, then deformation of internal clamping surfaces is reduced, but additional force-applying implement is required
Solution Approach 1:
The force-applying implement utilizes the existing coolant channels in the coupling legs as pathways for force transmission. By inserting force transmitting members through these already-present coolant channels, the system leverages its own structural features to deliver the necessary pressing force, avoiding the need for separate dedicated mechanisms while achieving precise deformation control.
3Ease of operation
If conventional press fit engagement is used, then attachment process is simple, but contact forces cause deformation and wear of internal clamping surfaces
Solution Approach 1:
The method maintains operational simplicity by performing the pressing action as a preliminary step before the rotation-based engagement. The coupling legs are pressed radially outward first, then the cutting head is rotated into engagement while the pressed position is maintained. This sequence preserves the simplicity of the rotational attachment process while eliminating the harmful contact forces that would otherwise occur during conventional press fit 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 method reduces deformation of internal clamping surfaces, allowing for more wear-resistant tool body use and simplifies the attachment/release process without additional tools, enhancing tool longevity and reducing tolerance requirements.
Implementation Method 1
the coupling legs are subjected to a slight elastic deflection radially outwards, i.e. a slight elastic bending in relation to the centre axis of the tool body, which in its turn implies that the coupling legs will exert a resilient clamping force on the coupling portion of the cutting head
Data Source
Figure 1~3a
Figure 3b~5
Figure 6~8d
AI summary
A method for attaching a replaceable cutting head (30) to or releasing it from a tool body (2) of a rotary cutting tool, wherein the cutting head has a coupling portion that is rotatable in relation to coupling legs (12) on the tool body into press fit engagement with internal clamping surfaces on the coupling legs. In order to facilitate the rotation of the cutting head in relation to the coupling legs between a disengagement position and an engagement position, the upper ends (12a) of the coupling legs are pressed radially outwards in opposite directions by means of a force-applying implement (50) and the pressing force on the coupling legs is maintained during the rotation of the cutting head. The force-applying implement is connected to the coupling legs by inserting male-shaped force transmitting members (51a, 51b) into a coolant channel in a respective coupling leg through a coolant channel outlet opening (8a) of the coolant channel.