"刀尖圆弧半径" can be translated as "corner radius" or more specifically, in the context of cutting tools, "tool nose radius".
"Corner radius" is a general term that can be used in various contexts to describe the radius of a rounded corner.
"Tool nose radius" is more specific to cutting tools and refers to the radius at the tip or nose of the tool, which is crucial for determining the tool's cutting performance and the finish of the machined surface.
In engineering or manufacturing documentation, "tool nose radius" would be the more accurate and precise term.