Cemented Carbide End Mill Curved Rake Ridge Heat Dissipation

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Solution Overview

Problem

Existing corner radius end mills face challenges when machining difficult materials like Inconel, experiencing degradation due to heat transfer, which affects finish quality and tool longevity.

Innovation Solution

A cemented carbide corner radius end mill with a continuously curved rake ridge from the bisector line to at least an axial location rearward of the corner relief surface, eliminating discontinuities in the rake ridge and incorporating a helical flute design with specific angle conditions, enhances machining performance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If a discontinuous rake ridge design is used at the corner relief surface location, then the manufacturing process is simpler, but the workpiece finish quality deteriorates and tool longevity decreases due to increased heat transfer

Engineering Contradiction:

Improverake ridge manufacturing simplicityVSAvoidtool longevity

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The rake ridge is designed with a continuously curved profile that smoothly transitions from the bisector line through the corner relief surface location to the radial tangent line, eliminating discontinuities. This curvature prevents stress concentration and heat buildup at the previously discontinuous location, thereby extending tool longevity while maintaining manufacturing feasibility through standard grinding processes

Inventive Principle:

Principle #14Spheroidality (Curvature)

2Ease of manufacture

If a discontinuous rake ridge design is used, then the manufacturing process is simpler, but the workpiece finish quality deteriorates

Engineering Contradiction:

Improverake ridge manufacturing simplicityVSAvoidworkpiece finish quality

Core Design Contradiction:

Ease of manufactureVSManufacturing precision

Solution Approach 1:

The continuous curved rake ridge eliminates the discontinuity at the corner relief surface, creating a smooth surface that produces superior workpiece finish quality. The curved geometry prevents chip snagging and ensures consistent cutting action, thereby improving finish quality without significantly complicating the manufacturing process

Inventive Principle:

Principle #14Spheroidality (Curvature)

3Device complexity

If traditional end mill design is used, then the device complexity is lower, but heat transfer to the end mill increases causing degradation

Engineering Contradiction:

Improveend mill geometry complexityVSAvoidheat transfer to end mill

Core Design Contradiction:

Device complexityVSTemperature

Solution Approach 1:

The continuously curved rake ridge design creates a smooth thermal path that reduces heat concentration at the tool-workpiece interface. The curved geometry promotes better heat dissipation along the rake face, reducing overall heat transfer to the end mill body and preventing thermal degradation

Inventive Principle:

Principle #14Spheroidality (Curvature)

Data Source

PatentEP3380264B1Cemented carbide corner radius end mill with continuously curved rake ridge and helical flute design

Publication Date: 2020.02.26 ISCAR LTD

Figure 1A~1B
Figure 2A~2C
Figure 3A~3C

AI summary

A corner radius end mill (10) includes a tooth (24) adjacent a helically extending flute (26). The tooth (24) includes axial (28A) and radial (28B) relief surfaces connected by a corner relief surface (28C), as well as rake surface (30) having a rake ridge (30C). The rake ridge (30C) is continuously curved from a bisector line (LB) until at least an axial location rearward of the corner relief surface (28C).