Drill Body Chip Flute Geometry for Stiff Long-Hole Drilling
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Drills face challenges in efficiently removing cutting chips during long hole drilling, requiring minimal radial deflection to maintain hole quality, which existing designs fail to adequately address.
Innovation Solution
A drill body with a central and peripheral chip flute configuration, featuring a central chip flute with a maximum depth and width range of 0.75 to 0.90 times the hole diameter, and a peripheral chip flute with specific lateral side dimensions, providing high bending and torsional stiffness to efficiently guide and remove cutting chips, along with coolant channels for enhanced chip transport.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the central chip flute cross section is made larger to improve chip removal, then chip evacuation efficiency is improved, but drill body stiffness decreases
Solution Approach 1:
The patent applies parameter changes by precisely defining the central chip flute cross-section dimensions as Dp=0.75×D/2 to Dp=0.90×D/2 for depth and W=0.75×D/2 to W=0.90×D/2 for width. These optimized parameters enable the chip flute to be large enough for effective chip evacuation while maintaining sufficient drill body stiffness for high-quality hole drilling.
2Manufacturing precision
If the drill body is made stiffer to reduce radial deflection, then hole quality is improved, but chip removal capability is reduced
Solution Approach 1:
The patent resolves this contradiction through parameter optimization, setting the central chip flute cross-section dimensions within specific ranges (Dp=0.75×D/2 to Dp=0.90×D/2 and W=0.75×D/2 to W=0.90×D/2) that balance structural stiffness with chip evacuation efficiency, enabling both high hole quality and effective chip removal.
Solution Approach 2:
The patent employs segmentation by dividing chip removal into two separate functions: the central chip flute for removing chips from the central cutting insert and the peripheral chip flute for removing chips from the peripheral cutting insert. This segmentation allows each flute to be optimized for its specific function without compromising overall drill performance.
Data Source
AI summary
A drill body and a drill are disclosed. The drill body has a rotational axis and comprises a central chip flute extending along a periphery of the drill body. A central chip flute cross-section has a centre line extending in a plane extending perpendicularly to the rotational axis, and through the rotational axis. The central chip flute cross-section has a depth, as seen along the centre line, and a width as seen perpendicularly to the centre line. The central chip flute cross-section has a maximum depth Dp within a range of Dp=0.75×D/2 to Dp=0.90×D/2, and a maximum width W within a range of W=0.75×D/2 to W=0.90×D/2, and wherein the maximum width W extends symmetrically about the centre line.