Segmented Flute Tap Geometry for Galling-Free Chip Withdrawal
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Solution Overview
Problem
Taps used for tapping materials like titanium alloys face issues with chip discharge and galling due to the low ductility of these materials, leading to clogging and damage during reverse rotation and withdrawal.
Innovation Solution
A tap design featuring a threaded portion with a cutting blade, a flute portion divided into multiple sections, and a shank portion with a specific geometry, including a first and second flute and a ridge line, where the distance from the central axis to the ridge line is longer than to the flute bottoms, and a clearance angle less than 2°, preventing chip entry into the threaded portion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a tap is used for tapping titanium alloy or other materials with relatively low ductility, then chip discharge performance is maintained, but chips enter the gap between the heel and work material causing galling and degradation of pull-out performance
Solution Approach 1:
The flute portion is divided into a first flute and a second flute that are continuous with each other, creating a ridge line portion. This segmentation prevents chips from entering the gap between the heel and work material by providing a continuous chip discharge path through both flutes, thereby preventing galling and improving pull-out performance.
Solution Approach 2:
The ridge line portion acts as an intermediary structure between the first and second flutes. It serves as a boundary that guides chips through the continuous flute path and prevents them from entering the harmful gap region, thus mediating between chip discharge requirements and galling prevention.
2Productivity
If the distance from the central axis to the ridge line portion is made longer than to the flute bottoms, then chip discharge performance is improved, but the structural complexity increases
Solution Approach 1:
The flute portion is segmented into two continuous flutes with a ridge line boundary. This segmentation naturally creates the geometric configuration where the ridge line is positioned farther from the central axis than the flute bottoms, optimizing chip discharge without requiring additional complex components.
Solution Approach 2:
The invention changes the geometric parameters of the flute portion by defining specific distance relationships: the distance from the central axis to the ridge line portion is made longer than the distances to the flute bottoms. This parameter change optimizes chip discharge performance while maintaining a relatively simple continuous flute structure.
Data Source
AI summary
A tap 1 has a threaded portion 2 including a cutting blade 5 on an outer circumferential surface, a flute portion 3 that divides the threaded portion 2 in a circumferential direction, and a shank portion 4 formed continuously from the threaded portion 2 and the flute portion 3 along a central axis O. The flute portion 3 includes, in a cross-sectional view, a first flute 31 formed continuously from the cutting blade 5 of the threaded portion 2, a second flute 32 formed continuously from the first flute 31, and a ridge line portion 33 being a boundary between the first and second flutes 31, 32. A distance “e” from the central axis O to the ridge line portion 33 is longer than a distance d1 and a distance d2, respectively.