"刀尖圆弧半径" can be translated as "corner radius" or "nose radius" in English, depending on the context.
"Corner radius" is often used in general machining or engineering contexts to describe the radius at the corner or tip of a cutting tool.
"Nose radius" is more specific to cutting tools like turning inserts or milling cutters, referring to the radius at the cutting edge's tip.
Both terms are widely accepted and understood in the industry. Choose the one that best fits your specific context.