Drill Rake Face Grooves for Lower Wear and Longer Lubrication
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing drills face significant wear issues on the rake face due to excessive contact area with swarf, leading to rapid wear and loss of surface coating film irregularity, which compromises cutting efficiency and tool longevity.
Innovation Solution
Incorporating a groove on the rake face with a depth of at least 1.5 μm, angled relative to the drill axis, reduces contact area with swarf, maintains lubrication, and alternates coating film and substrate exposure to minimize wear, while maintaining sufficient coating film thickness to ensure prolonged lubrication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the rake face is made smooth with a surface coating film, then the cutting tool has good initial lubrication, but the contact area with swarf becomes large leading to rapid wear
Solution Approach 1:
The patent applies local quality by creating grooves with specific depth (1.5-5.0 μm) and width (5-20 μm) at specific locations on the rake face. These grooves concentrate the irregularity in localized regions rather than distributing it uniformly, allowing the rake face to maintain good lubrication where needed while reducing contact area in groove regions to minimize wear.
Solution Approach 2:
The patent changes the surface topology parameter by introducing grooves with controlled depth (1.5-5.0 μm) and width (5-20 μm) into the surface coating film. This parameter change transforms the rake face from a uniformly smooth surface to one with controlled irregularities, reducing the contact area with swarf while maintaining sufficient coating thickness for lubrication.
2Duration of action of moving object
If the surface coating film is made thick to maintain lubrication, then lubrication is prolonged, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent optimizes the coating film thickness parameter to a specific range (5-20 μm) that balances lubrication duration with manufacturability. This parameter change allows the coating to be thick enough to provide prolonged lubrication while remaining thin enough to be applied using conventional coating methods without excessive complexity.
Data Source
AI summary
The drill has a rake face, a flank face, and an outer circumferential surface. The flank face is continuous to the rake face. The outer circumferential surface is continuous to both the rake face and the flank face. A ridgeline between the rake face and the flank face constitutes a cutting edge. A ridgeline between the rake face and the outer circumferential surface constitutes an outer circumferential end. A groove is provided cyclically in the rake face to extend at an angle relative to an axis of the drill, the angle being larger than a helix angle of the drill. The groove has a depth of more than or equal to 1.5 μm.