Differential-Pitch Milling Tool Layout for Vibration and Strength Balance
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Solution Overview
Problem
Existing metal cutting milling tools with differential pitch face issues related to balancing and strength, leading to potential tool failure, despite effectively reducing vibrations in most applications.
Innovation Solution
A metal cutting milling tool design featuring a body with varying seat pitch angles and arc lengths between land portions, ensuring balanced distribution of material and strength, while maintaining differential pitch to reduce vibrations, with identical cutting inserts and optimized screw hole configurations for improved stability and manufacturing simplicity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If differential pitch is implemented by positioning cutting inserts at different radial distances, then vibration reduction is achieved, but balancing problems and strength issues occur leading to tool failure
Solution Approach 1:
The patent applies local quality by making each land portion unique with specific arc lengths and seat pitch angles tailored to its position. This allows differential pitch for vibration reduction while maintaining balanced material distribution and strength across all land portions, preventing tool failure.
2Object-affected harmful factors
If differential pitch is implemented with varying arc lengths between land portions, then vibration reduction is achieved, but manufacturing complexity increases
Solution Approach 1:
The patent changes geometric parameters (arc lengths and seat pitch angles) of land portions to achieve differential pitch. By carefully selecting these parameters within specific ranges, the patent reduces vibrations while maintaining manufacturability through systematic parameter optimization.
3Adaptability or versatility
If land portions have considerably different arc lengths, then differential pitch is achieved, but strength distribution becomes uneven leading to weaker land portions
Solution Approach 1:
The patent uses asymmetry by giving each land portion a unique arc length and seat pitch angle configuration. This asymmetric design achieves differential pitch for vibration reduction while ensuring that no single land portion becomes excessively weak by balancing the asymmetry across all portions.
Data Source
AI summary
A metal cutting milling tool includes a body having a front end, a plurality of land portions extending axially rearwards from the front end, and a plurality of chip rooms extending axially rearwards from the front end. Each chip room is positioned between two adjacent land portions and each land portion is delimited by a leading and a trailing surface. Each land portion as part of the leading surface in a radially outer and forward region, includes an insert seat for receiving a cutting insert. At the front end of the milling tool, in a plane perpendicular to the central axis, an angle between a radius intersecting a radially outer point in the insert seat of a first land portion and a radius intersecting a corresponding point in the insert seat of a second land portion defines a seat pitch angle for the first land portion.