Rotating Tool Coating Uniformity for Flute and Cutting Edge Wear
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Solution Overview
Problem
Conventional rotating tools with coating films formed using arc ion plating (AIP) or magnetron sputtering (MS) methods exhibit insufficient wear resistance due to uneven film thickness distribution, particularly in the flute and cutting edge portions, leading to increased wear and reduced tool life.
Innovation Solution
The use of High Power Impulse Magnetron Sputtering (HiPIMS) method to form a coating film with a higher ionization ratio and controlled film thickness, ensuring a ratio of film thickness at the flute portion to cutting edge portion of at least 0.8, enhancing wear resistance and adhesion between the coating and base member.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If arc ion plating (AIP) or magnetron sputtering (MS) methods are used to form a coating film on a rotating tool, then a coating film can be provided on the base member, but the wear resistance improvement is insufficient due to uneven film thickness distribution
Solution Approach 1:
The patent employs High Power Impulse Magnetron Sputtering (HiPIMS) which uses periodic pulsed power delivery instead of continuous DC power. This periodic action creates distinct plasma phases (growth phase and decay phase) that enable better ionization and more uniform coating deposition across the substrate surface, resolving the film thickness uniformity issue while maintaining wear resistance
Solution Approach 2:
The patent changes the fundamental parameter of power delivery from continuous DC to pulsed high-power impulses. By controlling pulse width, duty cycle, and peak power density, the process achieves superior film thickness uniformity and wear resistance that cannot be obtained with conventional AIP or MS methods
2Manufacturing precision
If conventional coating methods are used, then a coating film is formed on the base member, but the film thickness ratio between flute portion and cutting edge portion is insufficient (less than 0.8)
Solution Approach 1:
The periodic pulsed power delivery in HiPIMS creates controlled plasma conditions that ensure uniform ionization and deposition across different tool surfaces. This results in a film thickness ratio between flute portion and cutting edge portion of 0.8 or more, significantly improving wear resistance compared to conventional methods
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 HiPIMS method achieves a significant improvement in wear resistance, leading to longer tool life and improved cutting precision with a more uniform film thickness distribution, suitable for high-precision machining.
Implementation Method 1
a magnetron sputtering (MS) method has been known
Implementation Method 2
a coating film is provided on a surface of a base member by an arc ion plating (AIP) method
Implementation Method 3
a coating film is provided on a surface of a base member by an arc ion plating (AIP) method
Data Source
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AI summary
It is an object to provide a rotating tool (10) having an excellent wear resistance. The rotating tool (10) includes: a base member (11) including a cutting edge portion and a flute portion (4); and a coating film (12) that coats a surface of the base member (11), a ratio B/A of a film thickness B of the coating film (12) coating a surface of the flute portion (4) to a film thickness A of the coating film (12) coating a surface of the cutting edge portion being not less than 0.8.