Cutting by use of rotating axially moving tool – Means to drive tool – Including means to move tool along tool-axis
Reexamination Certificate
1999-12-03
2001-08-28
Bishop, Steven C. (Department: 3722)
Cutting by use of rotating axially moving tool
Means to drive tool
Including means to move tool along tool-axis
C408S124000, C310S012060
Reexamination Certificate
active
06280124
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention relates to the field of machine tools which carry out machining by the removal of swarf, and more particularly those of them which require rotary working motion of the tool as well as further linear axial forward and backward motion (to carry out the working travel and then return to the initial position).
According to the present state of the art the said axial motion is normally provided by either a linear motor or mechanical movement systems of similar effect which act on the slide which supports the tool-bearing chuck as a whole. (Both these systems are well-known to those skilled in the art).
The main disadvantages resulting from such systems are the relative slowness with which they operate, structural complexity and relatively large dimensions for the tool-holding stations, factors which obviously have adverse repercussions on costs.
SUMMARY OF THE INVENTION
The inventor of this invention has conceived a solution which avoids all the abovementioned disadvantages and which essentially comprises causing forward and backward movements of the tool to be performed by a linear motor comprising a stator with electromagnetic induction windings housed in the body of the spindle and a moving part provided by permanent magnets (the fields from which interact with those created by the said windings) integrally attached the tool.
If the current passing through the said stator windings is suitably directed and if the said permanent magnets are orientated suitably and in an appropriate way, it is then readily possible to move the tool axially with appreciable speed as a result of the low mass of the moving parts, including the tool.
Tests performed by the inventor on prototype spindles according to the invention have in fact shown the possibility that a tool can be moved axially in both directions, imparting to it an acceleration which is up to six times the acceleration of gravity g.
This means that a tool can be moved by imparting an acceleration of approximately 59 M/s
2
to it; this fact provides a clear idea of the speed of operation of a spindle according to the invention.
REFERENCES:
patent: 4869626 (1989-09-01), Kosmowski
patent: 5598044 (1997-01-01), Satomi et al.
patent: 5734209 (1998-03-01), Hallidy
patent: 5997223 (1999-12-01), Kosmowski
Ballado Investments Inc.
Bishop Steven C.
Young & Thompson
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