Rotatable cutting head having a tip portion with three radially extending cutting edges that form a linear rotation profile.

JP7874104B2Active Publication Date: 2026-06-15ISCAR LTD
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Patent Information

Application Number
JP2023553592
Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
Priority Date
2021-03-29
Filing Date
2022-03-07
Publication Date
2026-06-15
Estimated Expiration
2042-03-07

AI Technical Summary

Technical Problem

Existing rotatable cutting heads with radially extending cutting edges often struggle with forming precise linear rotation profiles, inadequate chip evacuation, and the ability to machine flat shoulder surfaces between holes of different diameters.

Method used

A cutting head with three radially extending cutting edges and three circumferentially spaced chip evacuation passages, featuring a concave first cutting edge portion and a straight second cutting edge portion, configured to form a linear rotation profile and enhance chip evacuation.

Benefits of technology

The cutting head achieves precise linear rotation profiles, efficient chip evacuation, and the capability to machine flat shoulder surfaces between coaxial holes of varying diameters, improving drilling efficiency and tool longevity.

✦ Generated by Eureka AI based on patent content.

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Patent Text Reader

Abstract

A cutting head (20) rotatable about a central axis (A1), the cutting head (20) having a tip portion (22) and an intermediate portion (24). The tip portion (22) has an axially forward-most tip point (NT) contained within the central axis (A1) and three axially forward facing front faces (26) defining three chisel edges (28) extending axially rearward away from the tip point (NT), each front face (26) having a radially extending cutting edge with a second cutting edge portion (32) extending radially outward from one of the chisel edges (28) and a first cutting edge portion (34) extending radially outward therefrom. Each first cutting edge portion (34) is contained within an imaginary annular ring surface having an annular ring width spanning at least its radially inner and outer radial end points. In a front end view of the cutting head, each first cutting edge portion (34) is concave and the radial plane intersects an imaginary annular plane to form imaginary straight lines each having a length equal to the annular ring width.
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Citation Information

Patent Citations

  • Cutting head having tip portion with radially extending front cutting edges provided with both negative and positive rake angles, and rotary cutting tool

    US20200108449A1

  • Drill

    WO2019224862A1

  • Drill

    WO2021038841A1