Drill Flute with Variable Helix Angle for Chip Clogging
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Solution Overview
Problem
Conventional drills experience chip clogging issues due to a decrease in helix angle towards the rear end, leading to ineffective chip discharge during the cutting process.
Innovation Solution
A drill design featuring a first region with a larger helix angle θ1 and a second region with a smaller helix angle θ2, along with an elongated protruding part in the second region, to enhance chip flow and reduce contact area, thereby preventing chip clogging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the helix angle is decreased toward the rear end to shorten chip flow distance, then the chip flow distance is reduced, but chip clogging occurs due to weaker chip carrying force and increased contact area
Solution Approach 1:
The drill flute is divided into two regions with different helix angles: a first region with a larger helix angle for effective chip discharge, and a second region with a smaller helix angle for shorter chip flow distance. This local differentiation allows each region to optimize for its specific function, resolving the contradiction between chip flow distance and chip carrying capability
Solution Approach 2:
The continuous flute structure is segmented into distinct regions (first region and second region) with different geometric characteristics. The first region handles chip evacuation with larger helix angle, while the second region provides structural support and reduced chip flow distance with smaller helix angle, eliminating the need for a single compromised design
2Length of moving object
If the helix angle is decreased toward the rear end, then the chip flow distance is shortened, but the contact area between chips and helical flute increases leading to chip clogging
Solution Approach 1:
Different regions of the flute are assigned different helix angles to optimize local functions: the first region uses larger helix angle to minimize contact area during chip evacuation, while the second region uses smaller helix angle to reduce overall chip flow distance, thereby resolving the contradiction between contact area and chip flow distance
Data Source
AI summary
A drill according to an embodiment includes a bar-shaped drill body extending along a rotation axis, a cutting edge located at a front end of the drill body, and a first flute extending spirally from the cutting edge toward a rear end of the drill body. The first flute includes a first region which is located close to the front end and has a helix angle θ1, and a second region which is located closer to the rear end than the first region and has a helix angle θ2 smaller than the helix angle θ1. The second region includes an elongated protruding part along the first flute.