Eccentric Reamer Layout for Lower Surface Roughness
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Solution Overview
Problem
Conventional reamers fail to effectively reduce surface roughness of workpieces.
Innovation Solution
A reamer design with a core and outer-circumference cutting edges made of hard tool material, featuring a margin on the rear side of each cutting edge with a specific eccentricity range (0.01 mm to 0.5 mm) and unevenly spaced cutting edges, which enhances the burnishing effect and reduces surface roughness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional reamer design with minimal eccentricity is used, then rotational balance is maintained, but surface roughness reduction capability is insufficient
Solution Approach 1:
The patent applies parameter changes by optimizing the eccentricity value to a specific range (0.01 mm to 0.5 mm) rather than using minimal or zero eccentricity. This controlled parameter modification enables the margin to produce sufficient burnishing effect for surface roughness reduction while preventing excessive centrifugal force that would harm rotational balance.
Solution Approach 2:
The patent applies local quality by creating an asymmetric distribution of cutting edges around the reamer circumference. The cutting edges are positioned at different angular intervals rather than being uniformly spaced, which generates the necessary eccentricity for surface finishing while maintaining overall tool functionality through localized functional differentiation.
2Manufacturing precision
If cutting edges are evenly spaced, then manufacturing simplicity is maintained, but burnishing effect is insufficient
Solution Approach 1:
The patent applies asymmetry by deliberately positioning cutting edges at non-uniform angular intervals around the reamer circumference. This asymmetric arrangement creates the necessary eccentricity between the rotation axis and the center of gravity, enabling the margin to contact the workpiece surface and produce the burnishing effect required for surface roughness reduction.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The reamer achieves improved surface roughness reduction by optimizing eccentricity and cutting edge spacing, resulting in a smaller surface roughness Ra of the workpiece.
Implementation Method 1
the burnishing effect owing to the margin increases
Data Source
AI summary
A reamer includes a core, a plurality of outer-circumference cutting edges provided on an outer circumference of the core and made of a hard tool material, and a margin provided on a rear side of each the plurality of outer-circumference cutting edges in a rotational direction. A distance from an axis of rotation to a position of a center of gravity of the reamer is greater than 0.01 mm and not greater than 0.5 mm.