Abrading – Precision device or process - or with condition responsive... – With indicating
Patent
1997-06-06
1999-01-12
Scherbel, David A.
Abrading
Precision device or process - or with condition responsive...
With indicating
451 5, 451 25, B24B 4900, B24B 5100
Patent
active
058578951
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
1. Technical Field
The present invention relates to a device for checking dimensional characteristics of a surface with rotational symmetry of a workpiece, in the course of the machining in a microfinishing machine that comprises two movable shoes and at least an abrasive belt, arranged between one of the shoes and the workpiece, with at least one pair of gauging heads with associated movable feelers for contacting diametrically opposite portions of the cylindrical surface to be checked at a cross-section of the cylindrical surface, each gauging head comprising a transducer for providing electrical signals depending on the position of the associated movable feeler and a processing unit, electrically connected to the gauging heads, for receiving and processing said electrical signals.
The invention also relates to a microfinishing machine tool for machining cylindrical surfaces of a workpiece, comprising means for supporting and for driving the workpiece, adapted for defining a longitudinal axis of rotation and causing rotational displacements of the workpiece about said axis, at least an abrasive belt for machining the surface of the workpiece, a machining structure, with two oppositely arranged shoes bearing surfaces for providing a mechanical reference for the surface to be machined, the shoes being adapted to symmetrically approach to, and displace away from, each other for pressing the abrasive belt against the surface to be machined, and control means with a control and processing unit for controlling the displacements of the shoes and the workpiece, and a detecting device.
2. Background Art
Microfinishing machine tools can be utilized for machining external surfaces of workpieces, like crankshafts or camshafts, subsequently to the machining in grinding machines, for removing any after-grinding defects, like surface imperfections, and obtaining particularly accurate finishing. At times, some of the aforementioned machines can be used in the place of grinding machines.
The specific structure of a microfinishing machine comprises, generally, in respect of every surface to be machined, two oppositely arranged shoes for clamping and for reference purposes, and abrasive tools that are pressed against the surface by the shoes, while the workpiece is undergoing rotation for machining purposes.
The tools can consist of, for example, abrasive stones mounted upon at least one of the shoes or one or more abrasive belts pressed against areas of the surface to be machined by portions of the shoes.
The possibility of controlling a "microfinishing" cycle in an automatic way depends on the possibility of accomplishing an "in-process" gauging cycle of the "microfinishing" cycle; in other terms, checking, in a substantially uninterrupted way during the machining operation, the diametral dimensions and the geometrical characteristics of the involved surface, and consequently controlling the stopping of the machining and/or the adjustment of parts of the machine for compensating, for example, any detected shape errors.
According to a possible application, during automatic machining of the crankpins of a crankshaft any taper error on the cylindrical surfaces of the crankpins can be automatically corrected.
The difficulties in performing the in-process gauging derive from the specific structure of the machine, that limits in a considerable way access to the surface to be checked, the latter being narrow and enclosed between the shoes. The difficulties increase in the case of belt microfinishing machines, owing to the tool surrounding part of the surface.
DISCLOSURE OF THE INVENTION
Object of the invention is to overcome the foregoing difficulties and performing a particularly reliable automatic checking of the machining in microfinishing machines, in particular belt microfinishing machines for cylindrical surfaces.
A further object is to carry out an in-process gauging of the geometrical characteristics of cylindrical surfaces, comprising, for example, the automatic detecting of possible taper errors on sai
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Banks Derris H.
MARPOSS Societa' per Azioni
Scherbel David A.
LandOfFree
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