Parallelogram Cutting Insert Geometry for Rigid Drill-Turning Tools

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Multifunction cutting tools experience shifting cutting inserts and low tool rigidity during drilling and turning, compared to single-function tools, due to inadequate design and thickness distribution.

Innovation Solution

A cutting insert with a parallelogram-shaped main body, inclined hole, and parallel or nearly parallel peripheral side surfaces, which allows for increased insert thickness without compromising hole thickness, enhancing rigidity and fracture resistance by optimizing the arrangement of cutting edges and attachment geometry.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If the insert thickness is increased in a trapezoidal-shaped cutting insert, then the rigidity is improved, but the thickness around the hole becomes excessively small

Engineering Contradiction:

ImproverigidityVSAvoidthickness around hole

Core Design Contradiction:

StrengthVSLength of moving object

Solution Approach 1:

The cutting insert employs a parallelogram shape with parallel or nearly parallel opposing peripheral side surfaces, creating an asymmetric thickness distribution that maintains sufficient material around the hole while achieving the desired overall insert thickness for rigidity. This geometric asymmetry allows the thickness to vary strategically across the insert body.

Inventive Principle:

Principle #4Asymmetry

Solution Approach 2:

The solution transitions from a two-dimensional thickness parameter to a three-dimensional thickness distribution. By allowing thickness to vary across different locations and orientations of the insert, the design achieves both high rigidity and adequate hole clearance simultaneously through spatial optimization.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Reliability

If two cutting inserts are used in center edge and outer peripheral edge, then the fracture resistance is improved, but the rigidity of the tool main body excessively decreases

Engineering Contradiction:

Improvefracture resistanceVSAvoidrigidity of tool main body

Core Design Contradiction:

ReliabilityVSStrength

Solution Approach 1:

The cutting insert is designed with multiple cutting edges (center edge and outer peripheral edge) that can function independently or in combination, allowing a single insert to perform multiple cutting functions. This multi-functionality eliminates the need for separate inserts, maintaining tool body rigidity while providing fracture resistance through geometric redundancy.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The design merges multiple cutting functions into a single integrated insert structure. By combining center edge and outer peripheral edge cutting capabilities in one insert with optimized thickness distribution, the solution achieves both fracture resistance and rigidity without requiring multiple separate inserts.

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentUS11298749B2Cutting insert, holder, and cutting tool that includes cutting insert

Publication Date: 2022.04.12 TUNGALOY CORP

AI summary

There is provided a cutting insert used for both drilling and turning. The cutting insert includes an insert main body having a front surface and a rear surface, the outline shapes of which are parallelogram shapes, peripheral side surfaces disposed on four sides of the insert main body, cutting edges provided on respective intersecting ridge lines between the front surface and the peripheral side surface and between the rear surface and the peripheral side surface of the insert main body, and a hole provided in the insert main body to incline with respect to the front surface and the rear surface, the hole being usable for attachment.