# US 5,349,888 A · Method for machining surfaces or revolution at workpieces and disk-shaped tool for performing same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,349,888 A - Document ID: US5349888A - Status: Granted - Kind: A - Application number: 07/896,836 - Filed: 1992-06-11 - Granted: 1994-09-27 - Earliest claimed: 1991-06-11 - Assignees: Gebr. Heller Maschinenfabrik GmbH - Inventors: Karlheinz Schmid - Web page: https://patentgrep.com/patent/US5349888A ## CPC - B23D 37/005: {for cylindrical workpieces, e.g. crankshafts (takes precedence over other subgroups)} - B23B 5/18: for turning crankshafts, eccentrics, or cams, e.g. crankpin lathes - B23D 2043/063: {with cutters mounted externally} - Y10T 82/10: Process of turning - Y10T 82/19: Lathe for crank or crank pin - Y10T 407/23: including tool having plural alternatively usable cutting edges - B23D: PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR (making toothed gears or the like B23F; cutting metal by applying heat locally B23K; arrangements for copying or controlling B23Q) - B23B: TURNING; BORING (arrangements for copying or controlling B23Q) - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract A method for machining surfaces of revolution at workpieces comprises the eps of: rotating the workpiece during machining; roughing the workpiece with a disk-shaped tool having at its circumferential edge cutting elements with cutting edges; and, for finishing the workpiece, plunge-cutting by turning the workpiece with the disk-shaped tool, wherein the step of plunge-cutting by turning is divided into a sequence of individual plunge-cutting by turning steps so that material of overlapping portions of the workpiece is removed sequentially. The tool comprises a disk-shaped base body with a circumferential edge and a first set and a second set of cutting elements that are connected to and distributed over the circumferential edge of the disk-shaped base body. The first set is used in the roughing process, and the second set is used in the finishing process by plunge-cutting by turning. The cutting elements of the second set are spaced at a distance from one another in the circumferential direction of the tool and axially staggered such that, when viewed in the circumferential direction, the working areas of the cutting elements overlap. ## Claims ### Claim 1 A method for machining surfaces of revolution at workpieces, comprising the steps of: rotating the workpiece during machining; roughing by turning the workpiece with a disk-shaped tool having at its circumferential edge cutting elements with cutting edges; and, for finishing the surfaces of revolution of the workpiece, plunge-cutting by turning the workpiece with the disk-shaped tool wherein said step of plunge-cutting by turning is divided into a sequence of individual plunge-cutting by turning steps so that in an axial direction of the surfaces of revolution material of overlapping portions of the workpiece is removed sequentially. ### Claim 2 (depends on 1) A method according to claim 1, wherein said sequence of individual plunge-cutting by turning steps further comprises the steps of: positioning the cutting element for the individual plunge-cutting by turning step with its cutting edge on an imaginary connecting line between the axis of rotation of the workpiece and the axis of rotation of the disk-shaped tool; and radially moving the cutting element into engagement with the workpiece. ### Claim 3 (depends on 2) A method according to claim 2, wherein said sequence of individual plunge-cutting by turning steps further comprises the steps of: after completion of each said individual plunge-cutting by turning step, radially removing the disk-shaped tool from engagement with the workpiece; and subsequently, rotating the disk-shaped tool about its axis of rotation until a further one the cutting elements reaches said connecting line, followed by said step of radially moving the cutting element into engagement. ### Claim 4 (depends on 2) A method according to claim 2, wherein said sequence of individual plunge-cutting by turning steps further comprises the steps of: after completion of each said individual plunge-cutting by turning step, radially removing the disk-shaped tool from engagement with the workpiece; and simultaneously, rotating the disk-shaped tool about its axis of rotation until a further one the cutting elements reaches said connecting line, followed by said step of radially moving the cutting element into engagement. ### Claim 5 A disk-shaped tool for machining surfaces of revolution at workpieces, wherein the workpiece is rotated during machining, is roughed by turning with a disk-shaped tool having at its circumferential edge cutting elements with cutting edges, and, for finishing the workpiece, is plunge-cut by turning with the disk-shaped tool, and wherein plunge-cutting by turning comprises a sequence of individual plunge-cutting by turing steps so that in an axial direction of the surfaces of revolution material of overlapping portions of the workpiece is removed sequentially, said tool comprising: a disk-shaped base body with a circumferential edge; and a first set and a second set of cutting elements, connected to and distributed over said circumferential edge, said first set for a roughing process and said second set for a finishing process by plunge-cutting by turning, with said cutting elements of said second set being spaced at a distance from one another in the circumferential direction of said tool and axially staggered such that, when viewed in the circumferential direction of said tool, the working areas of said cutting elements overlap. ### Claim 6 (depends on 5) A tool according to claim 5, wherein said cutting elements have cutting edges extending parallel to the axis of rotation of said tool. ### Claim 7 (depends on 5) A tool according to claim 5, wherein aid cutting elements are turnplates. ### Claim 8 (depends on 5) A tool according to claim 5, wherein each said cutting element has at least two cutting edges. ### Claim 9 (depends on 5) A tool according o claim 5, further comprising flat contact surfaces at said circumferential edge for receiving said cutting elements.