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Diamond-Coated End Mill Increased Carbon Fiber Watch Dial Tool Life by 10×

A customer machining carbon fiber watch dials struggled with extremely short tool life when using conventional carbide end mills. After switching to our diamond-coated end mill for CFRP, the improvement was initially limited. Our engineers then reviewed the customer's cutting parameters and optimized the spindle speed and feed rate. The result was remarkable: machining efficiency increased by 10×, and a single tool successfully machined up to 60 watch dials.
Diamond-Coated End Mill Increased Carbon Fiber Watch Dial Tool Life by 10×,Zhuzhou Century Tool Co., Ltd
Case Details

Our Zhuzhou factory specializes in diamond-coated solid carbide end mills tailored for CFRP carbon fiber composite processing. This customer case shares how we helped a precision watch dial manufacturer overcome rapid tool wear problems. Our technical team optimized both diamond coating formula and cutting parameters, achieving 10 times longer tool life to reduce production downtime and tool replacement costs for carbon fiber watch part mass production. We support OEM custom milling cutters for all composite material machining scenarios.

A precision watch component manufacturer contacted Zhuzhou Century Tool after experiencing serious tool life problems while machining carbon fiber watch dials.

The customer was using a conventional solid carbide end mill to machine CFRP (Carbon Fiber Reinforced Polymer). However, the cutting edge became dull after machining only a few workpieces, resulting in:

  • Extremely short tool life
  • Poor edge quality
  • Frequent tool replacement
  • High production cost
  • Low machining efficiency

The customer was looking for a more durable solution without sacrificing machining quality.


Initial Solution

Based on the application, our engineers recommended our Diamond-Coated End Mill specifically designed for carbon fiber machining.

The tool features:

  • Ultra-fine grain carbide substrate
  • High-adhesion diamond coating
  • Excellent abrasion resistance
  • Optimized cutting edge geometry for composite materials
  • Reduced delamination and burr formation

Although the customer immediately noticed better wear resistance than with the previous carbide tool, the overall machining result still did not meet expectations.


Technical Investigation

Instead of simply replacing the tool, our engineering team reviewed the customer's complete machining process.

After analyzing the machining conditions, we discovered that the cutting parameters were not suitable for diamond-coated tools.

The spindle speed and feed rate had been set according to the customer's previous carbide end mill, preventing the diamond coating from achieving its full performance.

Our application engineers optimized the following parameters:

  • Spindle speed
  • Feed rate
  • Feed per tooth
  • Cutting engagement
  • Tool path strategy

No changes to the machine or fixture were required.


Final Results

After implementing the optimized machining parameters, the machining performance improved dramatically.

Before Optimization

  • Conventional carbide end mill
  • Tool failed after only a few workpieces
  • Frequent tool changes
  • Low production efficiency

After Optimization

  • Zhuzhou Century Tool Diamond-Coated End Mill
  • Optimized cutting parameters
  • Stable machining process
  • One tool successfully machined approximately 60 carbon fiber watch dials
  • Overall machining efficiency increased by approximately 10 times

Why the Improvement Was So Significant

Many users believe that simply changing to a better cutting tool will automatically improve machining performance.

In reality, tool performance depends on both the cutting tool and the machining parameters.

This successful application demonstrates two important advantages of Zhuzhou Century Tool products:

Excellent Carbide Substrate

The high-quality ultra-fine carbide substrate provides excellent rigidity and edge strength, ensuring dimensional stability even under high-speed machining conditions.

High-Performance Diamond Coating

Our premium diamond coating offers:

  • Outstanding wear resistance
  • Low friction coefficient
  • Excellent adhesion
  • Superior performance when machining highly abrasive composite materials such as carbon fiber

Combined with optimized cutting parameters, the tool delivers maximum productivity and significantly longer service life.


Engineering Support Creates Additional Value

At Zhuzhou Century Tool, we do more than manufacture cutting tools.

Our application engineers work closely with customers to optimize:

  • Tool selection
  • Cutting parameters
  • Machining strategy
  • Tool life
  • Production efficiency

Sometimes, a simple adjustment of machining parameters can unlock the full potential of a high-performance cutting tool.


Customer Benefits

✔ Tool life increased dramatically

✔ Machining efficiency improved by 10×

✔ Stable machining of approximately 60 carbon fiber watch dials per tool

✔ Lower tooling cost per component

✔ Reduced downtime for tool replacement

✔ Improved production consistency


Conclusion

This project demonstrates that tool performance is the result of both advanced tool technology and correct machining parameters.

By combining our high-quality carbide substrate, premium diamond coating, and professional application engineering support, Zhuzhou Century Tool helped the customer transform an unstable machining process into a highly efficient production solution.

If you are experiencing rapid tool wear when machining carbon fiber, CFRP, GFRP, graphite, or other composite materials, our engineering team can help you optimize both the cutting tool and the machining process to achieve maximum productivity.


About Zhuzhou Century Tool

Zhuzhou Century Tool specializes in high-performance carbide cutting tools, PCD tools, diamond-coated end mills, carbide inserts, and custom machining solutions for aerospace, automotive, electronics, medical, and precision manufacturing industries.

Need help optimizing your carbon fiber machining process? Contact our engineering team today for professional tooling recommendations and cutting parameter support.

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