Plastic and nonmetallic article shaping or treating: processes – With step of making mold or mold shaping – per se
Patent
1993-08-23
1995-04-04
Woo, Jay H.
Plastic and nonmetallic article shaping or treating: processes
With step of making mold or mold shaping, per se
264153, 264220, 264284, 425299, 425363, 425385, B29C 5904, B29C 3338
Patent
active
054035325
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a process for the production of a gasket, in which at least on one side on at least all points bearing in the use case, prior to installation, a three-dimensional sealing surface complimentary to the deflection of the surfaces to be sealed is shaped, as well as to a tool for performing the process.
2. Description of Related Art
As is known, gaskets and in particular cylinder head gaskets, require at the sealing point a specific contact pressure to enable them to fulfill their function. In the case of larger sealing surfaces, such as, e.g., between a cylinder head and a cylinder block of internal combustion engines, this contact pressure is produced with the aid of screws, the forces of which have to be distributed in a planned manner over the surface.
Known gaskets comprise a material whose thickness can be deformed on installation, or are made from thickness-deformable elements. It is disadvantageous that, on installation or in certain operating states, said gaskets are irreversibly deformed, so that, subsequently, the sealing effect is limited.
However, unlike in the case of the aforementioned gaskets, other gaskets, details of which have not yet been published, are provided at the time of manufacture and on a permanent basis with a thickness distribution that is correct for the particular application. They have, prior to installation or assembly, a topography required for the necessary pressure distribution. Therefore, the screw forces are distributed in a planned manner over the bearing surfaces to be sealed.
SUMMARY OF THE INVENTION
The object of the invention is to provide a production process for gaskets of the initially mentioned type, as well as a tool for this purpose. This object is achieved in the manners indicated herein.
A preferred further development comprises the following process steps: deformable material is fixed between the surfaces to be sealed, with a thickness gauge and the measured data are stored in a data processor, measured values and which is optionally corrected or modified taking account of operating and material parameters of the sealing surfaces, material process on the outer surface of a stamping roller under the control of the data processor and
The invention offers the advantage that a linear pressure is exerted on the material to be stamped or impressed, so that relatively small working forces occur. As a result of the movement of the roller over the sealing material there is no reshaping of the already profiled surface through the instantaneously deformed material.
According to a preferred development of the invention the roller circumference corresponds to the gasket length and has the complete gasket topography.
Alternatively, it can be advantageous for a given topography to be distributed several times in succession on the circumference and that one gasket side is completely formed by a single roller revolution. By simply rolling the roller, the corresponding topography is repeated stagewise, which can simplify production in the case of gaskets for engines having several cylinders.
A gasket free from undesired reshaping and material flows is obtained in that the stamping roller faces a counterroller, accompanied by the formation of a drawing channel.
In order to produce a gasket provided with a topography on two sides, it is particularly advantageous for there to be two correspondingly profiled rollers in axially parallel, juxtaposed form and accompanied by the formation of a drawing channel. It can be appropriate to weaken, in locally planned manner by a mechanical or thermal pretreatment, the areas provided for deformation purposes.
According to another development of the invention the stamping is performed in a state of slight deformability of the sealing material, which is then hardened.
Very precise sealing surfaces are obtained by performing the stamping process in two steps. Firstly a pre-impression is produced, followed by the stamping of the final topography.
A preferred deve
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Friedrichs K. Gerd
Stecher Friedhelm
Smith Duane S.
Woo Jay H.
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