Asymmetric Drill Margin Layout for Straight Running Stability
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Solution Overview
Problem
There is a demand for drills with higher straight running stability during the drilling process, particularly in metal workpieces, as existing drills with multiple margin surfaces do not consistently meet this requirement.
Innovation Solution
A drill design featuring a body with a first and second cutting edge, a thinning surface, a flute, and an outer peripheral surface with specific margin and clearance surfaces, which enhances stability by providing rotational symmetry and effective chip discharge, reducing friction, and improving cutting edge strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If multiple margin surfaces are provided on the drill, then straight running stability is improved, but device complexity increases
Solution Approach 1:
The patent applies asymmetry by providing only one margin surface (first margin surface) instead of multiple symmetric margin surfaces. This single margin surface is positioned at a specific location along the flute, creating an asymmetric configuration that still provides adequate straight running stability while reducing structural complexity compared to conventional drills with multiple margin surfaces distributed around the circumference.
2Manufacturing precision
If the second margin surface is positioned to intersect with the second straight line, then cutting performance is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent applies local quality by providing different surface configurations at different locations along the drill. Specifically, the first margin surface is provided with a specific inclination angle relative to the rotation axis, while the second margin surface is positioned to intersect with the second straight line (which is orthogonal to the first straight line connecting the rotation axis and the outer peripheral end of the first cutting edge). This localized optimization of surface geometry at critical positions improves cutting performance without requiring high precision throughout the entire drill structure.
Data Source
AI summary
A drill may include a body which is extended along a rotation axis from a first end to a second end. The body may include a first cutting edge, a second cutting edge, a thinning surface, a flute, and an outer peripheral surface. The outer peripheral surface may include a first margin surface, a clearance surface, and a second margin surface. In a plan view of the first end, an imaginary straight line connecting the rotation axis and an end part on a side of an outer periphery in the first cutting edge may be a first straight line, and an imaginary straight line which passes through a center of the first straight line and is orthogonal to the first straight line may be a second straight line. The second straight line may intersect with the second margin surface.