Constant-Lead Barrel Tool Geometry for Multiple Regrinds
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Solution Overview
Problem
Existing tooling with variable helix geometry, such as taper ball nose tools, are difficult to regrind as the cutting edge is not parallel, leading to changes in lead (pitch) during regrinding, which reduces cutting performance and limits the number of regrinds.
Innovation Solution
Implementing a constant lead geometry in barrel tools and circle segment cutters allows for multiple regrinds while maintaining the original geometry, as minimal material needs to be removed from the end face during each regrind.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If variable helix geometry is used in taper ball nose tools, then cutting performance is improved, but the tool becomes difficult to regrind and requires complete removal of previous fluting
Solution Approach 1:
The patent changes the geometric parameters of the cutting edges from variable helix to constant lead geometry. This parameter change allows the cutting edges to maintain a consistent pitch throughout their length, enabling them to be reground multiple times without requiring complete removal of previous fluting, thus resolving the contradiction between cutting performance and regrindability
2Ease of repair
If material is removed from the end face during regrind, then the tool can be reground, but the lead changes and cutting performance reduces
Solution Approach 1:
The constant lead geometry is designed such that the lead (axial distance between corresponding points on adjacent cutting edges) remains constant along the entire length of the cutting edge. This parameter consistency ensures that when material is removed during regrinding, the lead relationship is maintained, preserving cutting performance across multiple regrinds
3Manufacturing precision
If complete removal of previous fluting is done during regrind, then original geometry can be replicated, but tool length is significantly reduced
Solution Approach 1:
The constant lead geometry allows for partial removal of material during regrinding while maintaining geometric accuracy. Because the lead is constant throughout the cutting edge length, even a portion of the cutting edge can be reground without compromising the overall geometry, thus preserving tool length while achieving multiple regrinds
Data Source
AI summary
A constant lead barrel tool that may be reground multiple times.