Gear cutting – milling – or planing – Milling – Cutter spindle or spindle support
Patent
1998-11-05
2000-03-14
Briggs, William
Gear cutting, milling, or planing
Milling
Cutter spindle or spindle support
384 99, 408239R, B23C 900, B23B 3900, F16C 1700
Patent
active
060364149
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to the field of machine tools and more particularly to modifications with which high-speed machining of parts can be achieved under the best conditions.
2. Discussion of the Background
High-speed machining of parts in a machine tool generally takes place using a tool driven rotationally by the motor shaft of an electric spindle installed in a slide, which itself is mounted to be movable by translation along three axes X, Y and Z.
A machine tool is classically provided with three main working stations, to wit: the motor shaft of the electric spindle and shaping the part to be machined, an assembly of mechanisms that ensure in particular the X, Y and Z displacements of the slide of the electric spindle as well as the supply of power to the electric spindle for rotation of its tool-carriage shaft, of a program of instructions preestablished to take charge of the different phases of machining of the said part.
The Applicant has observed, during high-speed machining, that the rotation of the drive shaft of the electric spindle at extremely high speed, the contacts between the tool and the part to be machined, and the translational displacements of the slide of the electric spindle in the X, Y and Z directions are responsible in combination or individually for substantial vibrations of the assembly comprising slide and electric spindle. These vibrations are due in part to the fact that the operation of insertion of the electric spindle into the slide necessitates some mounting play between their contact surfaces, since clamping is takes place only on the front portion of the electric spindle, while the rear body of the electric spindle is not held directly in position. During the machining operations, therefore, vibrations develop which have harmful consequences for the internal elements of the electric spindle, resulting in shorter service life thereof.
SUMMARY OF THE INVENTION
The field of the invention relates more particularly to the process for mounting an electric spindle in a slide of a machine tool, said process comprising interposing an intermediate filling material between the contact surfaces of the electric spindle and the carriage slide thereof, for the purpose of damping the vibrations caused by high-speed rotation of the drive shaft of the said electric spindle and/or by the translational movements of the said slide and/or by the contacts of the tool with the part to be machined. The purpose of this intermediate material is to absorb the kinetic energy associated with the vibrations created by the high-speed movements of the shaft of the electric spindle and/or of the slide in order to limit the contacts and especially impacts between the electric spindle and the slide that can be harmful for the internal elements of those mechanisms.
The said intermediate material interposed between the contact surfaces of the said electric spindle and the said slide comprises oil which: mechanisms, minimum size, necessary for assembly of the electric spindle,
Another advantage of interposing an oil film between the zones of contacts between the electric spindle and the slide is that, during the micro movements that are always present in a cylinder inserted into a bore, it prevents the development of "contact" corrosion, which would be extremely detrimental to the quality of the nested joint defined between the slide and the electric spindle.
The oil is trapped in a sealed chamber confined between the contact surfaces of the electric spindle and slide on the one hand and between two O-rings which seal the space separating the two contact surfaces on the other hand. Thus the electric spindle can be mounted in the slide without modification thereof, so that a standard electric spindle can be used. This characteristic makes it possible to use two O-rings, or in other words standard elements which, while suitable for ensuring sealing at the cylindrical surfaces, also provide initial damping between the contact surfaces of the elec
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Briggs William
Renault Automation
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