CUTTING INSERT, TIP EXCHANGING TYPE BALL END MILL, END MILL BODY OF TIP EXCHANGING TYPE BALL END MILL

• Main Authors: NAGABUCHI KENJI, KIUCHI YASUHIRO, KOBAYASHI YOSHIYUKI
• Format: Patent
• Language: English; Japanese
• Published: 04.07.2019
• Subjects: BORING; MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR; MILLING; PERFORMING OPERATIONS; TRANSPORTING; TURNING

To reliably prevent displacement movement at a cutting time without damaging a strength of a cutting insert.SOLUTION: A cutting insert 1 comprises: a rake face; a seating surface 3 which is directed to a side opposite to the rake face, and is seated on an insert attachment seat; and a flank 4 which extends around the rake face and the seating surface 3. Two cutting blades 5, 6, which comprise circular arc-shaped cutting edge parts 5a, 6a which extend in a circular arc-shape, and linear cutting edge parts 5b, 6b which contact the circular arc-shaped cutting edge parts 5a, 6a, are formed at an intersection ridge line part between the rake face and the flank 4. A groove part 8 having a wall surface 8b, which can contact a protrusion which projects from a bottom surface of the insert attachment seat, is formed on the seating surface 3, and the groove part 8 has a width narrow part 9 in which a groove width becomes gradually narrow as going from one end side toward the other end side in an extension direction of said groove part 8.SELECTED DRAWING: Figure 3 【課題】切削インサートの強度を損なうことなく、切削加工時のずれ動きを確実に防止する。【解決手段】この切削インサート１では、すくい面と、すくい面とは反対側を向いてインサート取付座に着座される着座面３と、すくい面と着座面３との周囲に延びる逃げ面４とを備え、すくい面と逃げ面４との交差稜線部には、円弧状に延びる円弧状切刃部５ａ、６ａと、円弧状切刃部５ａ、６ａに接する直線状切刃部５ｂ、６ｂとを備えた２つの切刃５、６が形成され、着座面３には、インサート取付座の底面から突出する凸部に当接可能な壁面８ｂを有する溝部８が形成され、溝部８は、この溝部８が延びる方向の一端側から他端側に向かうに従い溝幅が狭くなる幅狭部９を有している。【選択図】図３