Coated Cutting Tool Crystal Orientation for Wear and Peeling Balance

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Solution Overview

Problem

Existing coated tools for cutting processes lack optimal durability and balance between hardness and peeling load, leading to insufficient wear resistance and fracture resistance.

Innovation Solution

A coated tool with a cubic crystal coating layer containing elements from Groups 4, 5, and 6, Al, Si, B, Y, and Mn, and C, N, O, featuring a specific orientation of the (111) plane with multiple peaks and valleys in X-ray intensity distribution, enhancing durability and balance between hardness and peeling load.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Duration of action of stationary object

If the coating film is made harder to improve durability, then durability is improved, but peeling load increases leading to coating detachment

Engineering Contradiction:

ImprovedurabilityVSAvoidpeeling load

Core Design Contradiction:

Duration of action of stationary objectVSForce

Solution Approach 1:

The invention changes the crystallographic orientation parameters of the coating film by controlling the deposition process to achieve specific pole figure characteristics (first peak at 45-60 degrees and second peak at 75-85 degrees). This parameter change in crystal orientation transforms the mechanical properties of the coating, achieving optimal balance between hardness for wear resistance and toughness for fracture resistance

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 exhibits improved durability, wear resistance, and fracture resistance due to the balanced hardness and peeling load, allowing for stable and long-lasting cutting processes.

Implementation Method 1

The coating layer includes a cubic crystal that includes one or more kinds of elements selected from Groups 4, 5 and 6 in the periodic table, Al, Si, B, Y and Mn, and one or more kinds of elements selected from C, N and O

Methodology Applied

Scientific EffectCubic crystal structure: Crystallisation

Implementation Method 2

a distribution of X-ray intensity indicated at α axis of a pole figure, the X-ray intensity regarding a (111) plane of the cubic crystal

Methodology Applied

Scientific EffectX-ray diffraction: X-Ray

Data Source

PatentUS11478859B2Coated tool, and cutting tool including same

Publication Date: 2022.10.25 KYOCERA CORP

AI summary

A coated tool according to the present disclosure includes a base member and a coating layer located on the base member. The coating layer includes a first peak located in a range of 0° to 90° and a second peak located at a higher angle side than the first peak in a distribution of X-ray intensity indicated at α axis of a pole figure, the X-ray intensity regarding a plane of the cubic crystal. The coating layer further includes a valley part between the first peak and the second peak, and the valley part includes the X-ray intensity smaller than the X-ray intensity at each of the first peak and the second peak.