Deburring Cutter With Segmented Edge For Wear-Resistant Chamfering

Solution Overview

Problem

Existing deburring cutters struggle to maintain accurate chamfer or countersink geometry of drilled holes as they wear out, leading to variable and uneven chamfer diameters, and fail to effectively remove large burrs without compromising the precision of the cutting action.

Innovation Solution

A novel deburring cutter design featuring a first cutting edge followed by a second inclined cutting edge, with a non-cutting free edge recessed radially toward the rotation axis, and a control edge positioned behind the free edge to prevent further cutting after the desired chamfer is achieved, ensuring precise control and maintaining the chamfer geometry independent of wear.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If a single cutting edge is used to deburr drilled holes, then large burrs can be removed effectively, but the chamfer diameter becomes variable and uneven as the cutter wears

Engineering Contradiction:

Improvebur removal capabilityVSAvoidchamfer diameter consistency

Core Design Contradiction:

ProductivityVSManufacturing precision

Solution Approach 1:

The cutting edge is divided into multiple sections: a first cutting section for aggressive burr removal, a non-cutting free edge section for control, and a second cutting section for precise chamfer formation. This segmentation allows each section to perform its specific function independently, resolving the contradiction between effective burr removal and consistent chamfer diameter.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The non-cutting free edge acts as an intermediary element between the first and second cutting sections. It provides a control surface that limits the cutting action of the first cutting edge, preventing over-cutting and ensuring consistent chamfer diameter while allowing the second cutting edge to maintain precision even as the cutter wears.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Manufacturing precision

If an inclined control edge is added to control the cutting action, then chamfer accuracy is improved, but the cutting action becomes less aggressive and cannot remove large burrs effectively

Engineering Contradiction:

Improvechamfer accuracyVSAvoidburr removal effectiveness

Core Design Contradiction:

Manufacturing precisionVSProductivity

Solution Approach 1:

The cutting edge is divided into multiple sections: a first cutting section for aggressive burr removal, a non-cutting free edge section for control, and a second cutting section for precise chamfer formation. This segmentation allows each section to perform its specific function independently, resolving the contradiction between effective burr removal and consistent chamfer diameter.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different sections of the cutting edge have different properties: the first cutting section has aggressive cutting geometry for burr removal, the free edge has non-cutting geometry for control, and the second cutting section has precise geometry for chamfer formation. This local differentiation allows each section to optimize its specific function without compromising the others.

Inventive Principle:

Principle #3Local quality

3Device complexity

If the control edge is omitted to simplify the cutter design, then the cutter can achieve large forward feed, but the chamfer becomes variable and uneven

Engineering Contradiction:

Improvecutter geometry simplicityVSAvoidchamfer uniformity

Core Design Contradiction:

Device complexityVSManufacturing precision

Solution Approach 1:

The cutting edge is divided into multiple sections: a first cutting section for aggressive burr removal, a non-cutting free edge section for control, and a second cutting section for precise chamfer formation. This segmentation allows each section to perform its specific function independently, resolving the contradiction between effective burr removal and consistent chamfer diameter.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The non-cutting free edge acts as an intermediary element between the first and second cutting sections. It provides a control surface that limits the cutting action of the first cutting edge, preventing over-cutting and ensuring consistent chamfer diameter while allowing the second cutting edge to maintain precision even as the cutter wears.

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS7273334B2Deburring cutter for deburring edges of drilled holes

Publication Date: 2007.09.25 HEULE WERKZEUG

AI summary

The first cutting edge can advantageously remove a large burr from the edge of a drilled hole with high effectiveness, because of the particularly aggressive cutting action of the first cutting edge. The following inclined second cutting edge advantageously allows precise chamfers to be cut, i.e., the surface and the angle of the counter bore can be precisely maintained, independent of the wear on the cutting edges. A control surface located adjacent to the cutting edge in the forward region enables a precise control of the cutter.