Dynamic Milling vs. Conventional Milling

You've already learned about the KOR5™ for aluminum, but we’re proud to announce that the KOR™ family is growing. Kennametal now offers a King of Roughing for aluminum, a King of Roughing for steel and stainless steel, and a King of Roughing for titanium as well.

King of Roughing End Mills

King of Roughing end mills are designed specifically to utilize CAD/CAM tool software, taking into account the shape of the workpiece, more so than the tool itself. Using dynamic milling techniques, these tools deliver the highest metal removal rates, worthy of the throne. Let’s take a quick look at the members of the royal family:

  • The KOR5 DA, as you know, is a five-flute end mill, with or without through coolant, and chip breakers designed for dynamic milling in aluminum.
  • The KOR5 DS is a five-flute end mill designed for dynamic milling in steel and stainless steel.
  • The KOR6 DT is a six-flute end mill designed for dynamic milling in titanium. 

Dynamic Milling vs. Conventional Milling

What we’re going to do is a comparison between dynamic milling tool design and tool design for conventional milling. Because flood coolant impairs the visibility of these applications, we’re going to focus on steel. For maximum visibility, we’re machining this block of steel dry. We’re going to machine the same part twice, once with the HARVI™ II five-flute end mill using conventional milling and 1xD and 70% radial engagement, and then once more with KOR5 DS using dynamic milling at 3xD and 15% radial engagement.

In conventional milling, end mills need to run at lower axial engagement and higher radial engagement. This requires machining the workpiece in multiple steps and also requires the tool to run slower. 

See how we had to add a second step here.

Now, let’s move on to dynamic milling. With dynamic milling, we can eliminate these extra steps and speed up the process by decreasing the radial engagement and increasing the axial engagement and increasing velocity. Due to the higher axial engagement, the stability of the tool is also much higher. 

In this case, we see four active contact points on the KOR5 DS versus the HARVI™ II with only one active contact point. With dynamic milling, we achieve higher feeds and speeds, lower cutting forces, less vibrations, lower temperatures, lower pressure on the tool– leading to higher productivity and higher tool life.  

If conventional milling is your only option, the HARVI II, HARVI III, and MaxiMet™ end mills deliver great productivity in aluminum, steel and stainless steel, and titanium.

Learn more about our KOR product line.

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