Rotary Cutting Tool Rake Face for Coolant Retention at the Edge

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Solution Overview

Problem

Rotary cutting tools face challenges in retaining coolant near the cutting point due to centrifugal force, leading to stress concentration and potential breakage of the cutting edge, especially under high cutting resistance.

Innovation Solution

The rotary cutting tool features a rake face constituted of multiple straight line portions with a difference in angles between adjacent portions of at least 8°, allowing effective coolant transportation and retention through capillary action, reducing friction and stress on the cutting edge.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If coolant is transported to the cutting point, then lubrication is improved, but centrifugal force prevents coolant retention near the cutting point

Engineering Contradiction:

Improvecoolant transportationVSAvoidcoolant retention

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The rake face is provided with recesses that function as porous structures to retain coolant through capillary action. These recesses allow the coolant to be held against centrifugal force, ensuring continuous lubrication at the cutting point while maintaining effective coolant transportation along the rake face.

Inventive Principle:

Principle #31Porous materials

2Ease of operation

If recesses are provided in the rake face to retain coolant, then lubrication is improved, but stress concentration occurs leading to cutting edge breakage

Engineering Contradiction:

ImprovelubricationVSAvoidcutting edge strength

Core Design Contradiction:

Ease of operationVSStrength

Solution Approach 1:

The recesses are strategically positioned in specific regions of the rake face where coolant retention is most beneficial, rather than uniformly distributing them. This localized approach provides effective lubrication where needed while avoiding stress concentration in critical areas, preventing cutting edge breakage.

Inventive Principle:

Principle #3Local quality

3Productivity

If large cutting resistance is applied, then material removal is effective, but stress concentration in recesses causes cutting edge breakage

Engineering Contradiction:

Improvematerial removalVSAvoidcutting edge reliability

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The recesses are designed with appropriate dimensions and positioning to cushion the stress that occurs during high cutting resistance operations. By providing these stress-relief features in advance, the cutting edge can withstand the stresses of effective material removal without breaking, maintaining reliability under high productivity conditions.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

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

This design effectively suppresses cutting edge breakage by ensuring coolant reaches the cutting point, reducing friction and enhancing tool life by maintaining coolant presence and distributing stress more evenly.

Implementation Method 1

allowing effective coolant transportation and retention through capillary action

Methodology Applied

Scientific EffectCapillary action: Capillary Action

Data Source

PatentEP4066972B1Rotary cutting tool

Publication Date: 2024.09.25 SUMITOMO ELECTRIC HARDMETAL CORP

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AI summary

A rotary cutting tool according to the present disclosure is rotatable about an axial line and includes a rake face and a flank face. The flank face is contiguous to the rake face. A ridgeline between the rake face and the flank face constitutes a cutting edge. In a cross section perpendicular to the axial line, the rake face is constituted of a plurality of straight line portions.