Method of producing an undercut, concave, self-contained bearing

Details Method of producing an undercut, concave, self-contained bearing Method of producing an undercut, concave, self-contained bearing

1996-10-21

1998-10-20

Pitts, A. L.

Gear cutting, milling, or planing

Milling

Process

29898048, 409143, 409165, 409199, 409201, B23C 900

Patent

active

058237216

DESCRIPTION:

BRIEF SUMMARY
The invention relates to a method of producing an undercut, concave and self-contained bearing surface in accordance with the preamble of claim 1.
This method is known as so-called spinner method, which is employed in the manufacture of axial and radial piston machines for forming hollow sphere segments in stroke-generating bodies intended for mounting ball end pins at displacement bodies or slippers, which stroke-generating bodies are for example the drive disks of bent axis machines, slippers or displacement bodies, such as for example pistons. The concave bearing surface of each hollow sphere segment extends beyond the equator of the sphere; its region located above the equator thus being undercut and assuming, for example in the case of the mounting of a piston, the necessary piston return function.
The diameter of the tool cutting edge orbit is equal to the length of a chord which extends from the upper limiting edge of the rounded indentation-like concave bearing surface to its lower apex. By feeding the tool, introduced into the indentation, along its obliquely set tool axis of rotation, set at the same angle of inclination to the vertical axis as the chord to the upper limiting edge or sphere equator, so far that the cutting edge orbit impinges upon the upper limiting edge of the bearing surface and therewith also on its lower apex, the desired hollow sphere segment is formed.
As a consequence of the angle of inclination of greater than 45.degree., determined through the size of the undercut, which the tool axis of rotation encloses with the vertical axis, there is required a relatively thin tool mounting shaft which allows only a correspondingly small loading and feed speed of the tool, since otherwise the necessary high working precision cannot be ensured. This means that the manufacturing times are undesirable long and it is not certain that the necessary dimensional exactitude of the bearing surface can be attained.
It is the object of the invention to so further develop the method mentioned in the introduction that the manufacturing time can be reduced and the dimensional exactitude of the undercut bearing surface can be increased.
This object is achieved in that the chord, which determines the diameter of the cutting edge orbit, extends from the sphere equator, and in that the region of the indentation below the sphere equator and that above the sphere equator are machined one after the other with two separate feed movements.
In this way, when determining the diameter of the cutting edge orbit, the undercutting of the bearing surface is not taken into consideration, so that the tool axis of rotation is, during the feed, obliquely set with an angle of inclination with respect to the vertical axis which is equal to or smaller than 45.degree.. Correspondingly, the tool mounting shaft can be formed more strongly so that it can withstand greater loading and thus higher feed speeds of the tool and therewith makes possible shorter manufacturing times with higher dimensional accuracy. The diameter of the cutting edge orbit determined in accordance with the invention, not taking into account the undercutting of the bearing surface, makes it necessary to produce the two bearing surface regions below and above the sphere equator in two separate feed movements which are preferably carried out with the tool axis of rotation in the same disposition, that is along the same feed axis, in opposite directions. The extra time needed for these two feed movements is, in comparison with the prior art, very small and is more than compensated for by the time gain afforded by the higher feed speeds.
For the production of the two bearing surface regions to the two sides of the sphere equator with the same radius R, the tool introduced into the indentation is expediently moved more deeply into the indentation with one the two feed movements along the inclined tool axis of rotation until it takes up an end position, upon completion of the bearing surface region below the sphere equator, in which end position the plane o

REFERENCES:
patent: 2499842 (1950-03-01), Armitage
patent: 3212405 (1965-10-01), Smith
patent: 4245939 (1981-01-01), Sear
patent: 4593444 (1986-06-01), Kavthekar
patent: 4625377 (1986-12-01), Kavthekar
patent: 4813828 (1989-03-01), Beck et al.
patent: 5031303 (1991-07-01), Orain
patent: 5197228 (1993-03-01), Sharkey, III et al.

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