Face Milling Cutter Insert Layout for Lower Vibration Cutting

Solution Overview

Problem

Conventional cutting tool assemblies for face milling experience uneven protrusion lengths of cutting inserts, leading to excessive cutting force, shortened tool lifespan, and surface roughness issues due to vibration.

Innovation Solution

A cutting tool assembly with a combination of fixed and stepped cutting inserts, where fixed inserts have identical lengths from the rotational axis and bottom surface, and stepped inserts have varying lengths, arranged in a zigzag pattern to minimize gaps and distribute cutting forces evenly.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If cutting inserts are disposed with gradual protrusion from periphery and axial end, then cutting tool assembly can machine workpiece step by step, but large difference in protrusion lengths causes excessive cutting force and shortened lifespan

Engineering Contradiction:

Improvestep-by-step machining capabilityVSAvoidcutting insert lifespan

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent applies local quality by differentiating the protrusion lengths of cutting inserts based on their specific positions. Fixed cutting inserts have uniform protrusion lengths, while stepped cutting inserts have progressively varying protrusion lengths. This localized differentiation ensures that each cutting insert group performs its specific function optimally, preventing excessive cutting forces on any single insert and thereby extending overall tool lifespan.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent employs asymmetry by creating an asymmetric arrangement of cutting inserts with different protrusion lengths. The stepped cutting inserts are specifically designed with asymmetric protrusion patterns relative to the fixed cutting inserts, allowing for controlled chip thickness distribution and reduced cutting forces while maintaining step-by-step machining capability.

Inventive Principle:

Principle #4Asymmetry

2Productivity

If cutting inserts have large difference in protrusion lengths, then step-by-step cutting is enabled, but vibration occurs and surface roughness deteriorates

Engineering Contradiction:

Improvestep-by-step cutting capabilityVSAvoidsurface roughness

Core Design Contradiction:

ProductivityVSManufacturing precision

Solution Approach 1:

The patent applies local quality by differentiating the protrusion lengths of cutting inserts based on their specific positions. Fixed cutting inserts have uniform protrusion lengths, while stepped cutting inserts have progressively varying protrusion lengths. This localized differentiation ensures that each cutting insert group performs its specific function optimally, preventing excessive cutting forces on any single insert and thereby extending overall tool lifespan.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent employs periodic action through the alternating arrangement of fixed and stepped cutting inserts around the cutter body. This periodic pattern creates regular, controlled variations in cutting depth that reduce vibration and improve surface finish while maintaining the step-by-step machining capability.

Inventive Principle:

Principle #19Periodic action

3Productivity

If first-mounted cutting insert protrudes more than last-mounted, then step-by-step cutting is achieved, but excessive cutting force is exerted on first-mounted insert

Engineering Contradiction:

Improvestep-by-step cutting progressionVSAvoidcutting force on cutting insert

Core Design Contradiction:

ProductivityVSForce

Solution Approach 1:

The patent applies local quality by differentiating the protrusion lengths of cutting inserts based on their specific positions. Fixed cutting inserts have uniform protrusion lengths, while stepped cutting inserts have progressively varying protrusion lengths. This localized differentiation ensures that each cutting insert group performs its specific function optimally, preventing excessive cutting forces on any single insert and thereby extending overall tool lifespan.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent employs equipotentiality by designing the fixed and stepped cutting inserts to work in a balanced manner. The uniform protrusion of fixed inserts and the progressive variation of stepped inserts create a balanced cutting force distribution, ensuring that no single insert group is overloaded while maintaining the step-by-step cutting progression.

Inventive Principle:

Principle #12Equipotentiality

Data Source

PatentUS12280438B2Cutting tool assembly

Publication Date: 2025.04.22 TAEGUTEC

AI summary

A cutting tool assembly includes: a cutter body extending perpendicularly from a bottom surface and including a cylindrical portion with a rotational axis; insert pockets disposed and formed concavely in the bottom surface and the cylindrical portion to be spaced apart from each other along a circumferential direction; fixed cutting inserts mounted within the insert pockets and disposed at the outermost portion of the cutter body in a radial direction; and stepped cutting inserts mounted within the insert pockets, the stepped cutting insert being disposed between two adjacent fixed cutting inserts. The fixed cutting insert is disposed to have an identical length from the rotational axis and an identical length from the bottom surface. At least one stepped cutting insert is disposed to have a different length from the rotational axis and a different length from the bottom surface compared to the remaining stepped cutting inserts.