US3988863A — Structure for and method of total form abrasion m…

Claim 1

Independent Claim 192 words

Structure for total form abrasion machining comprising a cutting master having an abrasive mirror image surface of an exact size form to be machined in a friable workpiece which is different in size than the form to be machined by an exact predetermined amount, means for supporting the cutting master over the friable workpiece, means operable between the cutting master and workpiece for imparting a relative rotary, orbital motion between the cutting master and workpiece, means also operable between the cutting master and workpiece for moving the cutting master and workpiece toward each other to engage the abrasive mirror image surface of the cutting master with the friable workpiece, means for flushing between the abrasive surface of the cutting master and workpiece to remove particles of the workpiece abraded from the workpiece by the cutting master in the absence of a difference in electrical potential between the cutting master and workpiece and means operable between the cutting master and workpiece for pulsing at least one of the cutting master and workpiece to move them away from each other periodically during machining to aid the flushing between the cutting master and the workpiece.

Claim 2

Dependent Claim 192 words

Structure for total form abrasion machining comprising a cutting master having an abrasive mirror image surface of an exact size form to be machined in a friable workpiece which is different in size than the form to be machined by an exact predetermined amount, means for supporting the cutting master over the friable workpiece, means operable between the cutting master and workpiece for imparting a relative rotary, orbital motion between the cutting master and workpiece, means also operable between the cutting master and workpiece for moving the cutting master and workpiece toward each other to engage the abrasive mirror image surface of the cutting master with the friable workpiece, means for flushing between the abrasive surface of the cutting master and workpiece to remove particles of the workpiece abraded from the workpiece by the cutting master in the absence of a difference in electrical potential between the cutting master and workpiece and means operable between the cutting master and workpiece for pulsing at least one of the cutting master and workpiece to move them away from each other periodically during machining to aid the flushing between the cutting master and the workpiece.

Claim 3

Dependent Claim 43 words

Structure as set forth in claim 1 and further including means operable between the cutting master and workpiece for repeating a periodic pulse exactly to provide a stutter effect for precision machining a workpiece which may deflect under pressure from the master cutter.

Claim 4

Dependent Claim 32 words

Structure as set forth in claim 1 and further including means operable between the cutting master and workpiece for providing a variable predetermined pressure between the cutting master and workpiece during machining.

Claim 5

Dependent Claim 48 words

Structure as set forth in claim 1 further including means operable between the cutting master and workpiece for locking the cutting master and workpiece in one position relative to each other in their movement toward each other in response to the desired form being abraded into the workpiece.

Claim 6

Dependent Claim 59 words

Structure as set forth in claim 1 wherein the means for imparting relative rotary, orbital motion between the cutting master and workpiece comprises at least one eccentric structure operably located between a table carrying one of the workpiece and cutting master and a fixed support, bearing means supporting the table and drive train means for rotating the eccentric structure.

Claim 7

Dependent Claim 125 words

Structure as set forth in claim 5 wherein the eccentric structure comprises a sleeve, a spindle rotatably mounted in the sleeve having a recess in one end thereof concentric with the axis of rotation of the spindle, an eccentric member comprising a disc having a first cylindrical portion on one side thereof received within the recess of the spindle which has an axis of generation concentric with the axis of rotation of the spindle and an eccentric cylinder on the other side of the disc which has an axis of generation which is offset with respect to the axis of generation of the first cylindrical portion, and second bearing means secured to the table and engaged with the eccentric cylindrical portion of the eccentric member.

Claim 8

Dependent Claim 31 words

Structure as set forth in claim 6 wherein the eccentric member is rotatable angularly about the axis of rotation of the spindle to adjust the rotary, orbital movement of the table.

Claim 9

Dependent Claim 41 words

Structure as set forth in claim 5 wherein the drive train means comprises a shaft having a drive gear one one end thereof, means for rotating the shaft, and pinion means engaged with the drive gear for rotating the eccentric structure.

Claim 10

Dependent Claim 41 words

Structure as set forth in claim 5 wherein the bearing means comprises at least on cylindrical support having an annular bearing race at the top thereof and a plurality of ball bearings in the bearing race on which the table rests.

Claim 11

Dependent Claim 51 words

Structure as set forth in claim 1 wherein the means for moving the cutting master toward the workpiece comprises an upper platen, a lower platen and a hydraulic ram positioned between the two platens for moving one of the platens toward and away from one of the workpiece and cutting master.

Claim 12

Dependent Claim 30 words

Structure as set forth in claim 10 wherein guide posts are secured to the movable platen for movement therewith which are guided at their opposite ends to prevent misalignment thereof.

Claim 13

Dependent Claim 30 words

Structure as set forth in claim 10 wherein hangers are secured to one of the platens for limiting the relative movement of the other of the platens in one direction.

Claim 14

Independent Claim 121 words

The method of total form abrasion machining comprising moving a cutting master having a mirror image abrasive surface thereon of an exact size form to be machined and which is different in size than the form to be machined by an exact predetermined amount toward an into engagement with a friable workpiece, imparting a rotary, orbital motion between the cutting master and workpiece with the mirror image surface in contact with the workpiece while flushing between the workpiece and cutting master in the absence of a difference in electrical potential between the cutting master and workpiece and pulsing at least one of the cutting master and workpiece to periodically move the cutting master and workpiece out of engagement during abrasion machining.

Claim 15

Independent Claim 121 words

The method of total form abrasion machining comprising moving a cutting master having a mirror image abrasive surface thereon of an exact size form to be machined and which is different in size than the form to be machined by an exact predetermined amount toward an into engagement with a friable workpiece, imparting a rotary, orbital motion between the cutting master and workpiece with the mirror image surface in contact with the workpiece while flushing between the workpiece and cutting master in the absence of a difference in electrical potential between the cutting master and workpiece and pulsing at least one of the cutting master and workpiece to periodically move the cutting master and workpiece out of engagement during abrasion machining.

Claim 16

Dependent Claim 44 words

The method as set forth in claim 13, and further including the step of locking the cutting master and workpiece in one position relative to each other in their movement toward each other in response to the desired form being abraded into the workpiece.

Claim 17

Dependent Claim 31 words

The method as set forth in claim 13 and further including repeating a predetermined pulsing step to provide a stutter effect and improve tolerance in abrasion machining of a deflecting workpiece.

Claim 18

Dependent Claim 25 words

The method as set forth in claim 13 and further including providing a variable predetermined pressure between the workpiece and cutting master during abrasion machining.

Claim 19

Dependent Claim 31 words

The method as set forth in claim 13 and further including preventing further relative movement between the cutting master and workpiece after the desired form has been abraded into the workpiece.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1979-11-02	1980-05-03	1980-11-02	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1983-11-02	1984-05-03	1984-11-02	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1987-11-02	1988-05-03	1988-11-02	$7700.00	Window Closed / Lapsed

Structure for and method of total form abrasion machining

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