Turning – Pattern section
Patent
1984-02-17
1987-03-10
Larson, Lowell A.
Turning
Pattern section
82 13, 51 90, 51 97NC, B23B 100, B23B 544
Patent
active
046482954
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a method for producing workpieces having polygonal outer and/or inner contours preferably by machining, with the workpiece to be processed rotating at a constant rate around a stationary axis while the tool is guided on a closed curved path. The rate of rotation of the workpiece and the circumferential speed of the tool on its curved path are dependent upon one another and the tool is in engagement with the workpiece during the entire revolution.
DE-OS No. 2,355,036 discloses a method of the abovementioned type in which the tool is guided on an elliptical path with respect to the workpiece. By superposing the rotating motion of the workpiece and the movement of the tool traversing an elliptical path, corresponding polygonal structures can be produced, even those having sharply drawn corners. When reduced to practice, the known process has resulted in drawbacks, for example a considerable reduction of the operating speeds since the gear mechanisms for generating the elliptical movement of the tool permit only limited numbers of revolutions. A further drawback of the prior art method is that the gear mechanisms required to generate the law of motion must be designed to be relatively large and, consequently, the production of polygons having different diameters requires a step-down lever arrangement which is difficult to accomplish with the necessary rigidity.
It is now the object of the invention to provide a method which permits greater operating speeds and a larger number of possible variations.
This is accomplished according to the invention in that the traveling speed of the tool during its revolution is changed according to a law of motion which is determined by the in-place rotation of the workpiece, the path of movement of the tool and the desired polygonal contour. This method has the advantage that the superpositions required to generate the polygonal contours are effected--instead of by superposition of a circular movement directly at the tool and a different path traversed by the tool--by a respective change in the rate of movement of the tool guided on a circular path. This offers considerable advantages for practical construction.
In a preferred embodiment of the method it is provided that the tool is guided essentially in a translatory manner on a circular path which is eccentric to the rotation axis of the workpiece. Such guidance of the tool offers not only defined engagement conditions between workpiece and tool but also permits in a simple manner the compensation of mass forces and results in a much more compact and thus more rigid design which produces workpieces with greater precision. The circular path here is tangent on the incircle and on the circumcircle of the profile to be produced.
In another embodiment of the method, it is provided that the tool rotates on a circular path which is eccentric to the axis of rotation of the workpiece and encloses it, the circle again being tangent on the incircle and on the circumcircle of the profile. This results in reduced tool speeds and more favorable pressure angles for the tool. It is advantageous for the tool to be guided on a circularly cylindrical path since it is then possible to also use tools having a large cutting width, for example grinding wheels. According to this method, cross-sectional contours having an approximately elliptical cross section or a "triangular" cross section can be produced in the manner of a so-called "constant diameter member". In view of the great accuracy in dimensions that can be realized, such cross-sectional contours can be used, for example, for plug-in connections in shafts or the like. The shape of the contour is here determined by the ratio of the number of revolutions of the tool to the number of revolutions of the workpiece, hereinafter called the speed ratio.
While in the above-described method, an influence on the polygonal contour depends essentially only on the speed ratio between workpiece and tool and the diameter of the tool path, and no polygonal contours having linear s
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Berghaus Horst
Ley Hans
Neumock Udo
Schmidt Manfred
Scholz Peter
Kearns Jerry
Larson Lowell A.
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