Abrading – Precision device or process - or with condition responsive... – Computer controlled
Patent
1996-01-26
1999-02-16
Morgan, Eileen P.
Abrading
Precision device or process - or with condition responsive...
Computer controlled
451 9, 451 11, 451242, 451246, B24B 4900
Patent
active
058713891
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention concerns machine tools particularly apparatus for grinding piece parts and other components to a very high accuracy, particularly but not exclusively components which have complex shapes and forms.
BACKGROUND OF THE INVENTION
Due to forces exerted on a workpiece, the worktable and workpiece supporting structures of such machines, distortions and misalignments occur. These result in inaccuracies in the dimensions and shape of the final machined article.
Where the dimensional errors are of the same order as the accuracy to which the article is to be machined it is impossible reliably to machine the article.
Distortions misalignments and other error producing effects which can arise amd tend to be cumulative must therefore be reduced to a level which is such that the magnitude of the cummulative error in the final article is much less than the error which can be permitted therein.
One of the primary controlling parameters in a machining operation is the accuracy with which the workpiece position relative to a machining tool is known. This parameter has been addressed and solutions proposed in our co-pending applications No (our references C421.01/L, C422.01/L,) filed concurrently herewith.
It is an object of the present invention to provide a system and method of operation of such a machine by which complex shapes and forms can be machined (typically by way of grinding) thereby to take advantage of the high accuracy now available when using such a machine.
The invention is of particular relevance to a cylindrical grinding machine.
SUMMARY OF THE INVENTION
This invention relates to a machine tool comprising a machine frame, a workpiece carrier on the frame, a workhead assembly carried by the workpiece carrier and including a tailstock drive, said workhead assembly and said tailstock assembly being carried by said workpiece carrier for coaction with each other to mount therebetween workpieces for machining and to drive such workpieces about a predetermioned work axis, a worktool carried by said machine frame for movement towards and away from said work axis and so as to coact with a workpiece when disposed thereat, to machine said workpiece, a worktool drive for said worktool, and control means for controlling said workhead drive, said tailstock drive and said worktool drive to effect machining of predetermined forms.
In particular the invention concerns a CNC cylindrical grinding machine comprising a bed, a worktable movable relative to the bed along a linear path, a wheelhead movable in a direction generally perpendicular to the direction of worktable travel, a rotatable grinding wheel mounted thereon for engagement with a workpiece mounted on the worktable, wheel drive means on the wheelhead for rotating the grinding wheel, headstock and tailstock means carried by the worktable for supporting a workpiece at its opposite ends, drive means associated with the headstock and tailstock means for rotating the workpiece, worktable drive means for effecting movement of the worktable relative to the bed and therefore the wheelhead, wheelhead drive means for effecting movement of the wheelhead and therefore the grinding wheel towards and away from the workpiece, control means by which all of the drive means and particularly the worktable and wheelhead drive means, are controlled, thereby to enable the workpiece to be positioned axially and rotationally relative to the grinding wheel, and to move the grinding wheel into engagement with the workpiece, further comprising transducer means for generating position and speed of rotation signals from at least the worktable and the wheelhead, and the headstock drive, for supply to the said control means, thereby to enable complex shapes and forms to be ground in the surface of the workpiece.
Preferably the transducer means for determining the linear position of the worktable along its traverse comprises a linear scale and a reading head associated therewith.
Preferably the transducer for determining the linear position of the wheelh
REFERENCES:
patent: 4219974 (1980-09-01), Schmidt
patent: 4512110 (1985-04-01), Stump
patent: 4686796 (1987-08-01), Giebmanns
Bartlett Christopher David
Laycock Michael
Leadbeater Peter Brian
Morgan Eileen P.
Pollack Morris I.
LandOfFree
Control of 2-axis machine tool does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Control of 2-axis machine tool, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Control of 2-axis machine tool will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2057716