Turning – Process of turning
Patent
1989-04-21
1991-06-11
Schmidt, Frederick B.
Turning
Process of turning
82 18, 82 19, B23B 544
Patent
active
050222937
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a method for producing workpieces with surfaces of non-circular but regular cross sections with a working tool, wherein the workpiece is rotated around its own axis and the axis of the workpiece is rotated around an axis being eccentric to the axis of the workpiece and the two rotations are brought into a certain relationship according to the surface to be generated. The invention also relates to a working machine for producing workpieces with surfaces of non-circular but regular cross sections including an eccentric spindle being rotationally driven, a main spindle arranged rotationally within the eccentric spindle and being rotationally driven around its own axis and a working tool driven for its feed motion. The invention can preferably be used for inner and outer surfaces which are rotationally symmetrical and have closed, broken-lined circumferences.
BACKGROUND OF THE INVENTION
Workpieces having limiting surfaces as mentioned above can be produced with lathes as described in GB-PS 1.222.986 or on griding machines as described in HU-PS 167 643. In these solutions, the limiting surfaces being non-cylindrical ones are manufactured by rotating the workpiece around its own axis as well as the axis of the workpiece around a second axis which is eccentrical to that of the workpiece. The brake points of the broken line of the limiting surfaces i.e. the number of corners of the produced surface profil are determined by the ratio between the numbers of revolutions of the respective axes. Further to this, the feed motion of the working tool must also be brought into harmony with the rotation of the axes.
In the known methods, these taks are solved by a mechanical control mechanism. Therein, the parts of the mechanism, i.e. also the main spindle and the eccentric spindle of the known working machines in a constant mechanical forced coupling or interlocking with one another. Therefore, a fine adjustment or a fine correction in the pre-set values of the control can not be carried out. This disadvantage results in the smaller accuracy of the parts produces according to the known solutions. This will be made understandable also by the fact that the known control mechanism of the known solutions are built from a great number of gear wheels and other constructional parts having forced interconnections between one another. As it is well known, a connection between two gear wheels has a certain accuracy in transfering the angular displacement from one wheel to the other. If a more than one connection of such wheels are arranged in series one after the other, the errors of motion transfer of the interconnections will sum up to a considerable difference between the prescribed or set angle position and the real or actual angle position of the spindles of the working machine.
Nevertheless, the above mentioned mechanism is quite noisy, its efficiency of power transfer is low as well as its duration is short. The main spindle of the working machine can be driven only slowly since the mechanical control mechanism don't allow a higher rotational speed.
The above mentioned defficiencies are of higher importance when the up-to-date control systems such as the numerically controlled working machines are also taken into consideration. In the machine industry, it is a common thing to solve all control problems by electronical methods and devices. However, the known solutions for producing these surfaces with broken-line circumferences are not adapted for applying the known electronical procedures and devices.
A further shortcoming of the known solutions is in that they are not suitable for producing workpieces with outer or inner limiting surfaces with polygonal profils generated by spiral-formed generatrix. The surfaces of the workpieces produced by the previous solutions can have only straight-lined generatrix.
ESSENCE OF THE INVENTION
The main object of this invention is to provide a method and a working machine for producing any kind of polygonal profiles with which the defic
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patent: 3593603 (1971-07-01), Gellert
patent: 3595108 (1971-07-01), Prescsak
patent: 3978766 (1976-09-01), Brennon
patent: 4564914 (1986-06-01), Ballough
patent: 4648295 (1987-03-01), Ley et al.
patent: 4651599 (1987-03-01), Ley
patent: 4653360 (1987-03-01), Compton
Csovak Erno
Farkas Jozsef
Fodor Sandor
Vekony Sandor
Vekony Sandorne
INNOFINANCE Altalanos Innovacios Penzintezet
Schmidt Frederick B.
Shideler Blynn
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