Spiral Conical Countersink for Smoother Running and Lower Wear

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Conical countersinks face challenges in maintaining smooth running and tool lifetime due to vibrations and wear, particularly because traditional main cutting edges run rectilinearly, leading to uneven cutting forces and increased rattling.

Innovation Solution

The conical countersink features main cutting edges that run in an arc or spiral shape around the axis of rotation, distributing cutting forces over a longer length and reducing wear, with optional rectilinear edges for balanced loading, and varying arc radii and twist angles for enhanced stability and smooth operation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If main cutting edges run rectilinearly from central to outer-circumferential-side corner, then the structure is simple and easy to manufacture, but cutting forces are unevenly distributed leading to vibrations and reduced tool lifetime

Engineering Contradiction:

Improvesimplicity of cutting edge geometryVSAvoidtool lifetime and smooth running

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The main cutting edges are designed to run in an arc shape instead of a straight line, following a curved path from the central cutting-edge corner to the outer-circumferential-side corner. This curvature distributes the cutting forces more evenly along the cutting edge, reducing vibrations and improving tool lifetime while maintaining manufacturability through standard grinding processes.

Inventive Principle:

Principle #14Spheroidality (Curvature)

Solution Approach 2:

The cutting edge geometry is modified by changing the path from linear to arc-shaped, with specific parameters including arc radius (0.5-150 mm) and twist angle (10°-70°). These parameter changes optimize the distribution of cutting forces and improve the overall performance of the countersink.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If main cutting edges are arranged with unequal angle distribution, then vibrations are reduced and surface quality improves, but the complexity of tool design increases

Engineering Contradiction:

Improvesmooth running and surface qualityVSAvoidcomplexity of cutting edge arrangement

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The cutting edges are arranged with unequal angle distribution around the axis of rotation, creating an asymmetric pattern that balances the cutting forces and reduces vibrations. This asymmetric arrangement improves surface quality while the symmetry of the arc-shaped edges themselves maintains manufacturing simplicity.

Inventive Principle:

Principle #4Asymmetry

3Stability of the object's composition

If main cutting edges have greater length through arc shape, then cutting forces are distributed over longer intervention length improving stability, but the manufacturing precision requirements increase

Engineering Contradiction:

Improvestability and smooth runningVSAvoidprecision of arc shape and twist angle

Core Design Contradiction:

Stability of the object's compositionVSManufacturing precision

Solution Approach 1:

The arc-shaped cutting edges with defined radius and twist angle provide greater cutting edge length, distributing cutting forces more evenly. The curvature is designed within specific parameter ranges (arc radius 0.5-150 mm, twist angle 10°-70°) that balance the benefits of force distribution with the capabilities of standard grinding manufacturing processes.

Inventive Principle:

Principle #14Spheroidality (Curvature)

Data Source

PatentUS11185934B2Conical countersink

Publication Date: 2021.11.30 GUEHRING KG

AI summary

The invention relates to a conical countersink (10) having at least one main cutting edge (16-1, 16-2, 16-3) extending in an arc-shaped, in particular spiral-shaped manner.