Rotary Drill and Reamer Braking Geometry for Feed Control

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Solution Overview

Problem

Rotary drilling tools face high engagement with material during drilling, leading to risks of blocking or breaking, especially during manual operations, and stepped tools experience jerks that increase these risks, along with increased thrust forces and reduced service life.

Innovation Solution

Incorporation of braking means, such as additional cutting edges or surfaces positioned axially set back from the main cutting edge, with reduced cutting power, to control the axial advance of the tool during drilling.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the helix angle and clearance angle of cutting edges are reduced to lower engagement force, then the risk of blocking or breaking is decreased, but the thrust forces increase making manual operations time-consuming and reducing tool service life

Engineering Contradiction:

Improverisk of blocking or breakingVSAvoidthrust forces and operation time

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The tool is divided into multiple cutting stages with different functions: main cutting edges for material removal and braking means for controlling axial advance. This segmentation allows each part to optimize its function without compromise

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The braking means are positioned to engage the material before the main cutting edges fully engage, creating a preliminary resistance that controls the axial advance and prevents excessive engagement forces

Inventive Principle:

Principle #9Preliminary anti-action

2Adaptability or versatility

If the tool is stepped to drill large diameters in hard materials or achieve tight tolerances, then drilling capability is improved, but jerks in tool steps impact the material increasing risk of jamming or breakage

Engineering Contradiction:

Improvedrilling capability for large diameters and tight tolerancesVSAvoidrisk of jamming or breakage

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The braking means are positioned axially set back from the main cutting edges, so they engage the material first to prepare a controlled entry path, eliminating jerks and preventing jamming before the main cutting edges engage

Inventive Principle:

Principle #10Preliminary action

3Productivity

If manual drilling is performed with high engagement tools, then cutting efficiency is improved, but the operator has difficulty controlling feed and must hold the tool to oppose engagement force

Engineering Contradiction:

Improvecutting efficiencyVSAvoidcontrollability of feed

Core Design Contradiction:

ProductivityVSEase of operation

Solution Approach 1:

The braking means create preliminary resistance that counterbalances the engagement forces, allowing the operator to control feed without excessive opposing force while maintaining cutting efficiency

Inventive Principle:

Principle #9Preliminary anti-action

Data Source

PatentUS20250229345A1Rotary cutting tool, such as a drill or a reamer

Publication Date: 2025.07.17 DESGRANGES OUTILS COUPANTS

AI summary

The invention relates to a rotary cutting tool (1), such as a drill (2) or a reamer (3), extending longitudinally along an axis (4) and comprising at least one main cutting edge (5) so that when the tool (1) is rotated about the axis (4), the tool (1) advances axially to perform a cutting operation on a material.According to the invention, the tool (1) comprises means for braking (7) the axial advance of the tool (1) during the cutting operation.