Milling Tool Coolant Sleeve for High-Speed Coolant Retention
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Solution Overview
Problem
Milling tools used in optical lens production face challenges with coolant distribution due to high rotational speeds, leading to reduced tool life and coolant loss, especially when using superhard cutting elements like PCD, which are less effective with traditional coolant delivery methods.
Innovation Solution
A coolant sleeve is designed to remain static relative to the rotating milling tool, with a close proximity and specific labyrinthine structures to minimize coolant loss and ensure effective coolant delivery to cutting elements, utilizing a unique coolant passageway design and obstruction arrangements to counteract centrifugal forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high rotational speeds are used for milling, then productivity increases, but coolant retention at cutting edges deteriorates due to centrifugal forces
Solution Approach 1:
The coolant delivery system adapts to the dynamic high-speed rotation by using centrifugal compensation features that adjust coolant flow paths and pressure distribution to counteract the outward centrifugal forces, ensuring coolant reaches cutting edges despite rotational speeds up to 35,000 RPM
Solution Approach 2:
The system changes physical parameters including coolant pressure, flow rate, and delivery timing to compensate for centrifugal effects at different rotational speeds, optimizing coolant retention across the full operating range from low to 35,000 RPM
2Duration of action of stationary object
If superhard cutting elements like PCD are used, then tool life should improve, but coolant effectiveness deteriorates because superhard materials benefit less from traditional coolant delivery
Solution Approach 1:
The coolant delivery system provides localized, concentrated coolant application directly at each cutting element's specific location, ensuring that each PCD cutting element receives adequate coolant despite the material's reduced coolant responsiveness, thereby maintaining tool life
Solution Approach 2:
The coolant delivery is segmented to provide individualized coolant supply to each cutting element rather than general cooling, with separate coolant channels and obstruction arrangements tailored to specific cutting element positions and loading conditions
3Productivity
If a static coolant sleeve is positioned close to the rotating tool, then coolant delivery efficiency improves, but unintended coolant loss through the gap worsens
Solution Approach 1:
The system converts the harmful centrifugal force that causes coolant loss into a beneficial element by using centrifugal compensation features that leverage the rotation to direct coolant inward toward cutting edges, transforming the outward centrifugal tendency into effective coolant delivery
Solution Approach 2:
Labyrinthine structures and obstruction arrangements act as intermediaries between the coolant supply and the gap, controlling and directing coolant flow to prevent unintended loss while maintaining efficient delivery to cutting edges
4Length of stationary object
If coolant pressure is increased to improve cooling, then coolant reach improves, but coolant loss through gaps worsens due to high rotational speeds
Solution Approach 1:
The system optimizes coolant pressure parameters in conjunction with centrifugal compensation features, using controlled pressure levels that work synergistically with the rotation to direct coolant to cutting edges without excessive loss through gaps
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 solution enhances coolant reach and retention at the cutting edges, improving tool life and coolant efficiency by directing coolant effectively despite high rotational speeds and reducing unintended coolant loss.
Implementation Method 1
it was conceived to provide a head coolant obstruction arrangement (or 'head labyrinth') to the milling tool which may further reduce unintended loss of coolant through the gap between the sleeve and milling tool
Implementation Method 2
directing the coolant to a desired part of the cutting element (in these embodiments, the desired part being a main cutting edge of the of the cutting element) was ineffective due to centrifugal forces causing the coolant to be redirected away from the desired part
Data Source
AI summary
A milling tool having a shank portion and a head portion extending from the shank portion. A head internal surface of the head portion is formed with a peripherally extending head coolant obstruction arrangement comprising a head ridge which extends in a rearward direction more than an adjacent head portion of the head internal surface located in a radially-inward direction more than the head ridge.