Metal treatment – Process of modifying or maintaining internal physical... – Producing or treating layered – bonded – welded – or...
Patent
1998-06-08
2000-09-19
Wyszomierski, George
Metal treatment
Process of modifying or maintaining internal physical...
Producing or treating layered, bonded, welded, or...
148656, 298883, 277355, F16J 1544
Patent
active
061206229
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND AND SUMMARY OF THE INVENTION
The invention relates to a process for manufacturing brush-type seals, for example, particularly brush-type metal seals. Furthermore, the invention relates to an arrangement for manufacturing such brush-type seals.
In the manufacture of brush-type seals, particularly those made of metal having inclined bristles, their inclination must be caused and the brushes must be densified or packed. In the manufacturing processes currently used in practice, this is achieved by means of two annealing processes. The first annealing process is used for placing the metal bristles in a sloped position; and the second process has the purpose of densifying the rounded brush which will then be ground at the inside diameter.
Thus a process for manufacturing a brush-type seal is known from European Patent Document EP 0 211 275 B1 whose bristles are fastened in a mounting preferably constructed as a holding ring. For this purpose, in a step A), a thread consisting of bristle material is first wound by way of two elongated spindles, which are spaced in parallel from one another, to form a dense thread stack which has an approximately oval cross-section. Then, in a step B), the thread seal is gripped on the two spindles by the fitting-on of clamping strips at the crowns. In a step C), the thread seal is severed by a cut in parallel to the spindles so that two mutually opposite, straight, semifinished brushes are created which are preferably equipped with bristles having the same length. Finally, in a step D), these semifinished brushes are bent to the desired brush contour, particularly to a circular arc contour, and are joined to form a closed ring.
For achieving an inclination of the bristles in their mounting, before process step B), the spindles which are wound with the thread seal are offset with respect to one another in the longitudinal direction. In this connection, when, for example, metal bristles are used, it is known to a person who is skilled in the art to carry out a recrystallization annealing for conserving the inclination of these metal bristles. This first annealing step before the severing of the thread seal for producing-semifinished brushes is carried out as a function of the material, for example, at 720.degree. C.
After step D), if metal bristles are used in practice, a second annealing step is required for compacting the brushes produced so far and adjusting their axial dimensional accuracy.
This state of the art basically already requires high expenditures because two separate annealing steps must be carried out. In addition, particularly the resetting of the wound thread seal to an annealing device, which is required for the first annealing step, is complicated, cumbersome and requires high mechanical expenditures.
It is an object of the present invention to simplify the manufacturing process for brush-type metal seals.
This object is achieved by a manufacturing process for brush-type seals characterized by a) providing at least one ring-shaped brush-type seal having radially extending bristles of a length which, by way of the inclining of the bristles with respect to the radii of the ring-shaped brush-type seal leads at least essentially to the endeavored brush diameter; b) 1) positioning the at least one brush-type seal and at least one heatable annealing wall of an annealing device relative to one another so that the free bristle ends, while the bristles are bent, rest against the annealing wall; 2) rotating the at least one brush-type seal and at least the heatable annealing wall relative to one another until the bristles are inclined with respect to the radii of the ring-shaped brush-type seal in its ring plane by a definable angle; c) heating the annealing wall to a definable temperature; d) maintaining the temperature of the heated annealing wall for a definable time period; and e) removing of the at least one brush-type seal from the annealing device.
A brush-type seal having a brush is therefore produced first without any inclination of the wires or brist
REFERENCES:
patent: 4202554 (1980-05-01), Snell
patent: 4267476 (1981-05-01), Lee
patent: 4730876 (1988-03-01), Werner et al.
patent: 4809990 (1989-03-01), Merz
patent: 4858304 (1989-08-01), Weldon et al.
patent: 5165758 (1992-11-01), Howe
patent: 5183197 (1993-02-01), Howe
patent: 5732466 (1998-03-01), Bouchard
Hagg Dieter
Mayr Alfred
MTU Motoren - und Turbinen-Union Muenchen GmbH
Wyszomierski George
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