TiCN-Coated Cutting Tool Faces for Chipping and Wear Resistance

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Solution Overview

Problem

Existing surface-coated cutting tools often have coatings of the same quality on both the rake and flank faces, which can lead to insufficient performance on the flank face even if the rake face is improved, resulting in inadequate chipping and wear resistance.

Innovation Solution

A surface-coated cutting tool with a TiCN layer having a (311) orientation on the rake face and a (422) orientation on the flank face, manufactured using chemical vapor deposition and peening, where the TiCN layer is discontinuously supplied and the Al2O3 layer is optionally added for enhanced heat resistance and chemical stability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If a hard coating is applied to improve wear resistance, then the coating hardness increases, but the coating becomes more brittle and prone to chipping

Engineering Contradiction:

Improvecoating hardnessVSAvoidcoating chipping resistance

Core Design Contradiction:

StrengthVSReliability

Solution Approach 1:

The patent changes the crystal orientation parameters of the coating material to achieve the desired balance between hardness and chipping resistance. By controlling the deposition conditions and applying different orientations on different surfaces, the coating maintains high hardness for wear resistance while the specific crystal structures provide toughness to prevent chipping. This parameter optimization resolves the contradiction by finding the right balance point in the material properties.

Inventive Principle:

Principle #35Parameter changes

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 tool achieves excellent chipping resistance and wear resistance by optimizing the orientation of the TiCN layer on both faces, with the (311) orientation on the rake face and (422) orientation on the flank face, and additional Al2O3 layer for improved thermal and chemical stability.

Implementation Method 1

the TiCN layer covering step is performed by chemical vapor deposition

Methodology Applied

Scientific EffectChemical vapor deposition: Chemical Vapour Deposition

Implementation Method 2

a peening step of peening the TiCN layer in the rake face

Methodology Applied

Scientific EffectPeening: Shot Peening

Data Source

PatentUS11213894B2Surface-coated cutting tool and method of manufacturing the same

Publication Date: 2022.01.04 SUMITOMO ELECTRIC HARDMETAL CORP

AI summary

A surface-coated cutting tool includes a base material and a coating covering the base material. The base material includes a rake face and a flank face. The coating includes a TiCN layer. The TiCN layer has a (311) orientation in a region d1 in the rake face. The TiCN layer has a (422) orientation in a region d2 in the flank face.