IPC분류정보
| 국가/구분 |
United States(US) Patent
등록
|
| 국제특허분류(IPC7판) |
|
| 출원번호 |
US-0359275
(1989-05-31)
|
| 우선권정보 |
DE-3842209 (1988-12-15) |
|
발명자
/ 주소 |
- Bohnet Siegfried (Mssingen DEX) Grfe Werner (Reutlingen DEX)
|
| 출원인 / 주소 |
- Cubic Defense Systems Inc. (San Diego CA 02)
|
| 인용정보 |
피인용 횟수 :
33 인용 특허 :
0 |
초록
▼
To permit boring with replaceable cutter elements (10, 10a, 10b), particularly into materials where, upon withdrawal of the boring tool from a bore hole (40), grooves or scratches are to be avoided, two cutter elements are positioned on a fluted cylindrical body (1), the cutter elements being so loc
To permit boring with replaceable cutter elements (10, 10a, 10b), particularly into materials where, upon withdrawal of the boring tool from a bore hole (40), grooves or scratches are to be avoided, two cutter elements are positioned on a fluted cylindrical body (1), the cutter elements being so located that the inner cutter element (10b) is positioned on the body so that an effective cutting edge (19) thereof is radially inwardly of the theoretical circle (33) formed by the outer cutter element (10a) upon rotation of the tool, the cutting corner of each cutter element is formed as a relieved or chamfered corner (15) and forms a chopped corner cutting edge (22). Both cutter elements (10a, 10b) are so positioned on the body that the chopped corner cutting edges are located at least in part on a diametrical plane (34) passing through the axis of rotation (31) of the body, and the inner cutter element, additionally, is so located that its chopped corner cutting edge (22 ) is located in the immediate vicinity of, at, or intersects the axis of rotation (31) of the body. The outer cutter element is so positioned that a corner cutting edge portion (23) projects beyond the circumference of the boring tool and it is oriented such that the main cutting edge portion (19) thereof extends along a chord with respect to the theoretical circle (33).
대표청구항
▼
Rotary boring tool for boring into a workpiece having a fluted cylindrical body (1) having a central axis (31) of rotation and which, upon rotation of the tool, defines a circle, said body having an end face (8); at least two polygonal cutter elements (10a, 10b) fitted into said body adjacent the en
Rotary boring tool for boring into a workpiece having a fluted cylindrical body (1) having a central axis (31) of rotation and which, upon rotation of the tool, defines a circle, said body having an end face (8); at least two polygonal cutter elements (10a, 10b) fitted into said body adjacent the end face (8); one (10a) of said cutter elements being located on said body at the radially outer position, and a second one (10b) of said cutter elements being located on said body at a radially inner position; each cutter element having at least one cutting edge, which cutting edge includes at least one main cutting edge portion (19) extending along a side of the polygonal element and corner cutting edge portions (22) adjacent the ends of the main cutting edge portion, said outer cutter element (10a) being positioned on the body (1) with a radially outer corner cutting edge portion (22) projecting beyond the circumference of the boring tool, said outer corner cutting edge portion defining a theoretical circle (33) upon rotation of the tool about said axis (31) of rotation, wherein said boring tool comprises an arrangement to provide, in operation of the tool, a radially directed force against said tool body by reaction between the cutter elements and the workpiece, said arrangement being characterized in that the corner cutting edge portions (22) of the cutting edges of each cutter element (10a, 10b) are formed as relieved or chamfered chopped corner cutting edges (22); the outer cutter element (10a) is positioned on the body (1) with its main cutting edge portion (19) oriented along a chord with respect to said theoretical circle (33), and wherein said chord is in a plane which does not pass through said axis (31) of rotation or the center of said theoretical circle (33); the inner cutter element (10b) is positioned on the body with its main cutting edge portion (19) located radially inwardly of the theoretical circle (33); both said cutter elements (10a, 10b) are positioned on the body (1) with the radially outer corner cutting edge portion (22) of the radially outer cutter element (10a) and the radially inner corner cutting edge portion (22) of the radially inner cutter element (10b) located, at least in part, on a diametrical plane (34) passing through the axis of rotation (31) of the body (1); and wherein the inner cutter element (10b) is further positioned on the body (1) with its inner corner cutting edge portion (22) located in the immediate vicinity of, or at the axis of rotation (31) of the body (1), whereby, in operation of the tool and upon contact of the cutter elements with the workpiece, when boring a bore hole (40) therein, a radially outwardly, with respect to the axis of rotation (31), directed force component is generated in the tool body.
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