IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0214532
(1980-12-09)
|
우선권정보 |
DE-2834083 (1978-08-03) |
발명자
/ 주소 |
- Grfe Werner (Reutlingen DEX) Held Paul (Sonnenbhl-Willmandingen DEX)
|
출원인 / 주소 |
- Montanwerke Walter GmbH (Tbingen DEX 03)
|
인용정보 |
피인용 횟수 :
36 인용 특허 :
7 |
초록
▼
To provide for self-centering of boring tools, particularly of larger diameter boring tools having replaceable rotatable cutter bits, the cutter bit closest to the central axis of the tool holder or tool shank, i.e. the radially innermost bit is formed with auxiliary cutting surfaces adjacent the co
To provide for self-centering of boring tools, particularly of larger diameter boring tools having replaceable rotatable cutter bits, the cutter bit closest to the central axis of the tool holder or tool shank, i.e. the radially innermost bit is formed with auxiliary cutting surfaces adjacent the corners of a square or parallelogram-shaped bit, for example by chamfering the corner, with a relief surface therebehind, and positioning the auxiliary cutting surface to intersect the central axis of the boring tool so that, in operation, a small conical tip will be left which is continuously reduced in size and cut; and wherein the cutter bits are positioned on the tool bodies to present cutting edges at the end face which overlap with respect to workpiece removal, so that each cutter bit will independently cut into the workpiece, at least the inner cutter bit being guided in its cutting circle by the radially outer corner fitting against the surface cut in the workpiece.
대표청구항
▼
Boring tool to cut a hole in a workpiece having a tool body (1, 2) having a longitudinal central axis (9); at least two radially staggered recesses (4) at the end face of the tool body; a cutter bit (5) located in each recess (4) at the end face of the tool body, said cutter bits having positive axi
Boring tool to cut a hole in a workpiece having a tool body (1, 2) having a longitudinal central axis (9); at least two radially staggered recesses (4) at the end face of the tool body; a cutter bit (5) located in each recess (4) at the end face of the tool body, said cutter bits having positive axial angles (ga) with respect to said axis and each being located at different radial distances from the central axis (9); said cutter bits (5) being, in plan view, generally square or parallelogram-shaped defining sides and corners and of truncated pyramidal shape, having main cutting edge (7) along sides of the large base of the truncated pyramid; and means (6) to removably secure said cutter bits to the tool body and to permit presentation, selectively, of different cutting edges to a workpiece in accordance with the position of the cutter bits on the tool body; wherein at least the radially innermost cutter bit is formed with auxiliary cutting edges (10, 10a, 10b) at the corners adjacent the main cutting edges and connecting said main cutting edges at an obtuse angle with respect to said main cutting edges; wherein: said radially innermost cutter bit is located on the body with the radially inner auxiliary cutting edge (10, 10a, 10b) intersecting said central axis (9); wherein said cutter bits (5) are positioned on the tool body in radially overlapped position such that the main cutting edges (7) thereof will form with the central axis (9) of the tool, and taken in the direction of the cut or feed of the tool, lead angles (b1, b2) of less than 90°to locate the auxiliary cutting edges (10, 10a, 10b) at the radially outer corners of the respective bits axially in advance of the radially inner corners of the respective bit, and such that at least a portion of the radially outer auxiliary cutting edge (10, 10a, 10b) of a radially inner bit is located axially in advance of the main cutting edge (7) of the next radially outer bit at the radial position of said radially outer auxiliary cutting edge, so that the main edges of said bits will cut shallow conical surfaces in the workpiece, the outer auxiliary cutting edges (10, 10a, 10b) will cut stepped grooves concentric with said central axis (9) and the radially inward auxiliary cutting edge of the radially innermost cutter bit will additionally cut across the central axis, the overlap position of said cutter bits on the tool body (1) relieving the auxiliary cutting edges at the radially inner corner of the outer cutter bit or bits from cutting action due to removal of workpiece material at the respective radial position by the radially outer portion of the main cutting edge and the adjacent radially outer auxiliary cutting edge (10, 10a, 10b) of the adjacent radially inner cutter bit; wherein the cutting action of the radially innermost cutter bit effects cutting into the workpiece with its main cutting edge in accordance with the cutting edge lead angle (b1, b2) and its radial position on the tool body, the auxiliary cutting edge (10, 10a, 10b) at the radially outer corner of the innermost cutter bit, of which at least a portion is positioned axially in advance of, and radially outwardly with respect to, the auxiliary cutting edge of the radially inner corner of the adjacent radially outer cutter bit, cuts said stepped groove concentric with said control axis (9) to provide for self-centering of the tool within the bore; and wherein the cutting action of a cutter bit adjacent a radially inner cutter bit effects cutting of the workpiece with its main cutting edge in accordance with its cutting edge lead angle (b1, b2) and its radial position on the tool body, and the auxiliary cutting edge (10, 10a, 10b) of the radially outer corner of said radially outer cutter bit and being positioned axially in advance of the auxiliary cutting edge at the radially inner corner thereof additionally cuts a stepped groove concentric with said central axis to further enhance and support said self-centering of the tool.
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