Drill Body Cage Sealing for Liquid Duct Leakage
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Solution Overview
Problem
Conventional drill bodies face issues with liquid leakage and inferior precision due to the need for assembling two parts with intersecting threaded bores, leading to poor machining results and varying tolerances.
Innovation Solution
The solution involves forming female threads within cages that are seated against the inside surfaces, ensuring a leak-proof connection with male threads or plugs, allowing for flexible hose connections without intersecting the liquid ducts, enabling the drill body to be manufactured in a single solid piece with improved dimensional accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If threaded bores are used to create inlets in the drill body, then hose connections can be made, but liquid leakage occurs through the threads intersecting the liquid ducts
Solution Approach 1:
A threaded cage is introduced as an intermediary component between the liquid duct and the hose connection. The cage contains the female thread and is positioned such that the threaded bore does not intersect the liquid duct, while the cage itself seals against the duct. This mediator allows threading functionality without creating leakage paths through the liquid duct.
Solution Approach 2:
The female thread is moved from a radial orientation (intersecting the duct) to an axial orientation (parallel to the duct axis) by placing it in a cage that extends along the duct. This dimensional repositioning allows the thread to be formed without compromising the integrity of the liquid duct.
2Ease of manufacture
If the drill body is assembled from two parts with intersecting threaded bores, then inlets can be formed, but manufacturing precision deteriorates due to assembly tolerances
Solution Approach 1:
The drill body is manufactured as a single integrated piece rather than assembling two separate parts. The liquid ducts and threaded cages are formed directly in the monoblock during machining, eliminating assembly interfaces and associated tolerance accumulation. This merging of parts preserves manufacturing precision while still allowing threaded inlet formations.
3Adaptability or versatility
If threaded bores are created to allow hose connections, then flexibility in connection is improved, but the structure becomes more complex with intersecting bores
Solution Approach 1:
The threaded connection functionality is segmented into a separate cage component rather than being integrated directly into the drill body structure. This segmentation allows the thread to be formed in a dedicated element that can be precisely positioned without complicating the overall drill body structure, maintaining simplicity while providing connection flexibility.
Data Source
Figure 1~2
Figure 3~6
AI summary
Generally, this invention relates to a basic body intended for cutting tools of the type that comprises an internal duct (10) and an inlet (12, 13) surrounded by a female thread (22) for the supply of liquid to the duct. According to the invention, the female thread (22) of the inlet is formed in a cage (16), which is inserted in a seating (17, 18) delimited by an endless inner wall (23) as well as a bottom (24), in which seating the duct (10) mouths. The invention is particularly applicable to drill bodies.