Layered-Material Drill Structure for Ring Swarf Cutting

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Solution Overview

Problem

When drilling through layered bodies consisting of fiber reinforced plastic (FRP) and metal layers, existing drills often generate ring-shaped swarf in the metal layer, which is difficult to manage and can lead to processing issues.

Innovation Solution

A drill design featuring a first cutting edge and a second cutting edge, where the second cutting edge is positioned to intersect and cut the ring-shaped swarf generated by the first cutting edge, with a helical flute and recess structure that facilitates the removal of swarf, preventing its adherence and ensuring efficient swarf removal.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If a single cutting edge is used to drill through layered bodies, then the drilling process is simple, but ring-shaped swarf is generated and adheres to the workpiece

Engineering Contradiction:

Improvedrill structureVSAvoidring-shaped swarf generation

Core Design Contradiction:

Device complexityVSObject-generated harmful factors

Solution Approach 1:

The single cutting edge is divided into two separate cutting edges (first cutting edge and second cutting edge) positioned at different locations. The first cutting edge drills the initial hole while the second cutting edge intersects and cuts the ring-shaped swarf generated by the first cutting edge, preventing its adherence to the workpiece.

Inventive Principle:

Principle #1Segmentation

2Object-generated harmful factors

If the second cutting edge is positioned to cut the ring-shaped swarf, then swarf removal is improved, but the drill structure becomes more complex

Engineering Contradiction:

Improveswarf removalVSAvoiddrill structure

Core Design Contradiction:

Object-generated harmful factorsVSDevice complexity

Solution Approach 1:

Two cutting edges and their associated flutes are merged into a single integrated drill body. The first cutting edge with its helical flute and the second cutting edge with its recess are combined in one tool, allowing simultaneous swarf generation and interruption functions without requiring multiple separate tools or complex mechanisms.

Inventive Principle:

Principle #5Merging (Combining)

3Productivity

If ring-shaped swarf is generated in the metal layer, then the drilling process continues, but processing issues arise due to swarf adherence

Engineering Contradiction:

Improvedrilling continuityVSAvoidprocessing quality

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The ring-shaped swarf, which initially causes harmful adherence and processing issues, is converted into a beneficial target for the second cutting edge. By positioning the second cutting edge to specifically intersect and cut this swarf, the harmful adherence problem is transformed into a controlled swarf removal mechanism that improves processing quality while maintaining drilling continuity.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Data Source

PatentUS11229959B2Drill

Publication Date: 2022.01.25 SUMITOMO ELECTRIC HARDMETAL CORP

AI summary

A drill includes a body. The body includes a first cutting edge, and a second cutting edge apart from the first cutting edge to the back end side relative to the first cutting edge and formed in a recess traversing an outer peripheral portion of the body. In a side view of the body in a first direction in which a distance between a center axis of the body and a first outer end of the first cutting edge is seen the longest, a second outer end of the second cutting edge is located at the center axis side relative to the first outer end of the first cutting edge.