Rotary Cutting Tool Recessed Groove Insert Alignment

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Solution Overview

Problem

Conventional rotary cutting tools face issues with precision and stability due to inaccuracies in the mounting of cutting inserts, leading to eccentric rotation and potential chipping, especially when using non-polished peripheral surface cutting inserts with lower precision and cost.

Innovation Solution

A rotary cutting tool design featuring a recessed insert attachment seat with radially extending grooves on the tool body, allowing elastic deformation to secure the cutting insert coaxially and distribute cutting resistance, thereby enhancing precision and stability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If a conventional mounting method without elastic deformation is used, then the structure is simpler, but the cutting insert cannot be precisely aligned coaxially, leading to eccentric rotation and reduced manufacturing precision

Engineering Contradiction:

Improvealignment precision of cutting insertVSAvoidstructure complexity of attachment seat

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The attachment seat incorporates elastic deformation capability through recessed grooves that allow the seat to dynamically adjust and deform under mounting pressure. This dynamic feature enables the seat to conform to the cutting insert and achieve precise coaxial alignment, resolving the contradiction between simplicity and precision by introducing controlled elasticity into the mounting mechanism.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The recessed grooves in the attachment seat enable parameter changes in the seat's physical state by allowing elastic deformation when the cutting insert is mounted. This deformation changes the seat's shape and positioning characteristics, enabling precise alignment of the cutting insert with the tool body's axis line, thereby improving manufacturing precision without requiring overly complex external alignment mechanisms.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If cutting resistance is concentrated at a single mounting point, then the mounting structure is simpler, but the cutting insert becomes unstable and prone to chipping

Engineering Contradiction:

Improvestability of cutting insert mountingVSAvoidstructure complexity of attachment seat

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The attachment seat is segmented with multiple recessed grooves distributed around its circumference. These grooves create multiple contact points and deformation zones that distribute the mounting stress and cutting resistance across several locations rather than concentrating it at a single point. This segmentation enhances the stability and reliability of the cutting insert mounting while maintaining structural simplicity.

Inventive Principle:

Principle #1Segmentation

3Ease of manufacture

If non-polished cutting inserts with lower precision are used, then the cost is reduced, but the alignment accuracy and cutting precision deteriorate

Engineering Contradiction:

Improvemanufacturing cost of cutting insertVSAvoidalignment accuracy of cutting insert

Core Design Contradiction:

Ease of manufactureVSManufacturing precision

Solution Approach 1:

The attachment seat with recessed grooves performs self-alignment by elastically deforming to match the position of the mounted cutting insert. This self-service mechanism automatically compensates for dimensional variations in non-polished, lower-precision inserts, ensuring accurate coaxial alignment without requiring high-precision manufacturing of the inserts themselves. This allows the use of cost-effective non-polished inserts while maintaining high alignment accuracy.

Inventive Principle:

Principle #25Self-service

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

The design ensures precise alignment and stable mounting of cutting inserts, preventing eccentric rotation and chipping, even with non-polished inserts, by securely attaching the cutting edge to the tool body and dispersing cutting resistance effectively.

Implementation Method 1

a plurality of recessed grooves which are recessed from the bottom surface to extend in the circumferential direction of the neck portion, with the both ends being opened to the outer peripheral surface of the neck portion from the wall surface, are formed on the bottom surface so as to travel around the insert attachment seat around the axis line. Each of these recessed grooves extends in such a manner that at least the both ends thereof move radially to the outer peripheral side with respect to the axis line toward the both end sides from a circle which is centered on the axis line in contact with the center between these both ends

Methodology Applied

Scientific EffectElastic deformation: Elasticity

Data Source

PatentUS8734069B2Rotary cutting tool

Publication Date: 2014.05.27 MITSUBISHI MATERIALS CORP

AI summary

A rotary cutting tool is provided with a tool body having a shank portion and a neck portion, an insert attachment seat formed at the tip of the neck portion, and a cutting insert detachably mounted on the insert attachment seat so as to be coaxial with the axis line of the shank portion. The insert attachment seat is provided with a bottom surface on which a side surface which serves as a seating surface of a cutting insert is seated and a wall surface in contact with a peripheral surface of the cutting insert. On the bottom surface, a plurality of recessed grooves which are recessed from the bottom surface to extend in the circumferential direction of the neck portion, with the both ends being opened on an outer peripheral surface of the neck portion.