Processing High-quality and long-life processing of CFRP by crystal diamond coated fiber mill

Technical Classification:
[ Processing ]
[ Jig ]
[ CFRP processing ] [ increase of life of tool ] [ reduction of uncut remnant or tear ]

Point of the Proposed Technology

・In the cutting process of carbon fiber reinforced resin (CFRP) by which the tool wears out very quickly, adoption of crystal diamond coating having an enhanced crystalline and an increased wear resistance greatly increases the life of tool.


Longer life of tool (over double the life of a general-purpose tool)
Reduction of uncut remnant or tear

Conventional Technology

【Application examples to end mil】

Problems in processing of CFRP (carbon fiber reinforced plastics)

CFRP = Carbon Fiber Reinforced Plastics
New material made by laminating carbon fiber fabrics and hardening them with resin

1) Quick wear
  ・Hard carbon fiber: 6,000 to 8,000 HV
   ⇒ When a general carbide tool is used, it wears out quickly and becomes short-lived
2) Delamination or uncut remnant easily occurs.
  ・When a dull cutting tool is used, laminated carbon fibers are not cut, and interlaminar delamination or uncut remnant occurs, resulting in defect in quality.
3) Low heat resistance
  ・Since the heat-resistant temperature of resin is about 200°C, the processing heat must be suppressed.
   ⇒Cutting edge having a low resistance and a good sharpness required.

New Technology

Technology Deployment and Cooperation

Development Stage
Commercialization Completed (already delivered: yes)
Intellectual Property Right
Joint Researchers (their role)
Nippon Institute of Technology (performance assessment for coating film)
Example of Application
Aircraft body parts using CFRP
Technical Problems
The shape of tool can be considered according to processing precision required by users.
Collaborator needed to Improve
Technical WEB page


Personnel / Department
Technology Development Round Tool Technology Development Section,Engineering Dept., Cutting Tool Division / Shinichirou Oono
1-1-1, Fujikoshi-Honmachi, Toyama, 930-8511, JAPAN
Inquiry Form

Outline of Company and Organization

Shiodome Sumitomo Bldg. 17F, 1-9-2 Higashi-Shinbashi, Minato-ku, Tokyo 105-0021,Japan
Capital / No. of Employees
16,000,000,000 yen / 3147 employees (Non-Consolidated)
Product Line
Cutting tools, bearings, hydraulic robots, steel products, etc.
Major Customers
Automobile manufacturers, heavy industries manufacturers
Overseas Base(s)
United States, China, Brazil, Thailand, etc.
Company/Organization WEB page

Update date: 2020/2/2

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