Gear cutting – milling – or planing – Milling – Process
Patent
1997-10-14
2000-06-06
Howell, Daniel W.
Gear cutting, milling, or planing
Milling
Process
29DIG50, 29DIG77, 82 111, 82901, 210168, 210171, 407 11, 408 56, 408 61, 409136, 409137, 451449, B23Q 1110
Patent
active
060710470
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a method and apparatus for feeding a coolant liquid and separating and recovering it in a cutting machine and a grinding machine, particularly a method and apparatus for feeding a flow of coolant liquid to a region of contact between a cutter or the like and a workpiece and it also relates to a method and apparatus for automatically separating and recovering the coolant liquid subsequent to the supply thereof.
BACKGROUND ART
In machining, the factor which plays a major role in shortening the processing time and minimizing the strain due to processing is to enhance contact lubrication between a cutting tool or grinding tool and a workpiece and promote dissipation of heat of friction or cooling. That is, from the standpoint that the cutting conditions can be improved by slightly weakening the surface layer, if the coolant liquid is allowed to flow in all directions into the main cutting shear region and to be adsorbed by the created macroscopic cracks or voids, this results in lowering the surface energy and preventing re-adhesion. Such effect of brittleness in the shear region is very useful in providing an increased shear angle and a decrease in the thickness of chips and also in the cutting force. On the other hand, since tools transiently create a field of plastic deformation and shear in the surface of a workpiece, it is of utmost importance that effective cooling and lubrication be effected for each transient field of plastic deformation and shear with which the tool comes in contact.
However, in conventional machine tools, a coolant liquid fed directly to such transient field (tool contact region) through a nozzle is flung away by the rotation of the tool or workpiece and only superficially passes along the tool and workpiece surfaces; therefore, it can hardly be said that the coolant liquid contributes to effective cooling and lubrication.
SUMMARY OF THE INVENTION
In order to ensure that a coolant liquid in machine tools finds its way to a tool/workpiece contact region in a film-formed flow with desirable fluidity against the centrifugal force from a rotating surface and satisfactorily enters the shear region, I have experimentally created phase conditions of various coolant liquids for investigation.
As a result, I have found that continuous mixing of air in a coolant liquid decreases the liquid phase mass, thereby making it difficult for the liquid coolant to be flung away because of the decreased centrifugal force when impinging on a rotating body adjacent the tool contact region, that of the liquid particles which are splashed in all directions upon the bursting of air bubbles, those which are heading for the tool contact region also enter the narrow shear region, thereby providing improved lubrication, and that the remaining air bubbles adhere to foreign matters, such as chips, to enhance the fluidity and buoyancy thereof, thereby contributing to the separation and recovery of the coolant liquid.
Accordingly, an aspect of the present invention provides a method for feeding a coolant liquid to a cutting machine or grinding machine, which is characterized by feeding a coolant liquid, with bubbles caused to form continuously therein, for cutting or grinding operation to a region under machining, expediting the splashing of air bubbles in all directions when the air bubbles impinge on the region under machining and burst, and also expediting the entry of accelerated splashed liquid particles into a cutter/workpiece pressure contact plane, thereby improving the cooling and lubrication of said region under machining, whereby the air bubbles in the coolant liquid which has failed to reach the region under machining or which, though reaching there, has left there for the recovery channel are allowed to adhere to suspended foreign matters in said liquid, thereby expediting the surfacing of the foreign matters.
Then, in order to allow the coolant liquid to be affluently fed to the region under machining, I have tried, not to directly spout it against
REFERENCES:
patent: 2837972 (1958-06-01), Knowles
patent: 3605551 (1971-09-01), Stewert
patent: 3868195 (1975-02-01), Anderson et al.
patent: 4325663 (1982-04-01), Lee
patent: 4733999 (1988-03-01), Kitamura
patent: 4946322 (1990-08-01), Colligan
patent: 5245152 (1993-09-01), McCall
patent: 5458770 (1995-10-01), Fentz
patent: 5800104 (1998-09-01), Miyano
Howell Daniel W.
Zeta Heiwa Ltd.
LandOfFree
Method and apparatus for feeding coolant liquid and separating a does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and apparatus for feeding coolant liquid and separating a, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for feeding coolant liquid and separating a will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2208989