Fluid handling – Processes
Patent
1997-07-29
1998-12-29
Lee, Kevin
Fluid handling
Processes
25112915, 2989013, F16K 3106
Patent
active
058530177
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a closing device for closing pressure fluid conveying channels in a housing, the outside periphery of the closing member including at least one indentation into which, during press fitting the closing member into the channel, basic material of the housing is deformed to provide a form lock.
BACKGROUND OF THE INVENTION
German utility model No. 87 16 060 discloses a closing device for closing bores or channels in which pressure fluid is conveyed. The closing device has a positive connection with the housing by a closing member pressed into a stepped bore. The basic material of the stepped bore, which provides the form lock, is plastically deformed into an indentation between two piston portions on the closing member which correspond to the two bore portions. The closing member is thereby fastened and sealed in the housing bore.
OBJECT OF THE INVENTION
Therefore, an object of the present invention is to provide a closing device of the generic type so that a particularly reliable attachment and sealing of the closing member in the housing is achieved by incurring low manufacturing costs. Another object is to indicate a suitable method of monitoring the press-in operation of the closing member into the housing.
SUMMARY OF THE INVENTION
According to the present invention, this object is generally achieved by a housing which is made of a malleable aluminum alloy and a closure member which is made of steel, wherein with respect to the method of monitoring the closing of a pressure fluid connection by such a closing member, the press-in force applied when the closing member is forced into the housing is measured, monitored and evaluated as a function of the travel covered by the component that is forced in.
The material composites silicon, iron, copper, manganese, magnesium, chrome, zinc and titanium take great influence on the material properties of the housing. A certain quantity of each of these chemical elements is provided in a mass ratio which determines the deformability and machineability of the housing.
To permit ease of machining the steel by turning, milling, drilling and chip detaching operations, to render the steel mechanically resistant, and to provide a durable hydraulic seal-tightness of the steel, a chemical compound is proposed which determines the above mentioned material properties in the steel within defined quantity limits.
To satisfy the requirements imposed on the materials of the housing and the closing member, the steel is specified in terms of its necessary physical properties by tension tests. To this end, the appropriate characteristic quantities of the materials used are a yield strength of at least 520N/mm.sup.2 for the steel and at least 230 to 330N/mm.sup.2 for the aluminum, a tensile strength of at least 520N/mm.sup.2 to 650N/mm.sup.2 for the steel, and at least 310 to 380N/mm.sup.2 for the aluminum.
To judge whether the material values of the chosen closing device are appropriate for the desired deformability and machineability, which are attained by rather soft to medium-hard materials, a Brinell test of hardness is applied.
Preferably the malleable square bar of aluminum alloy which is hot-pressed, thermally treated and straightened. This permits qualities of use of the semifinished products which are in conformity with the demands of manufacture and performance.
In a favorable aspect of the present invention, the material structure of the steel is made up of a ferritic basic material in which perlite is laminated. Mechanical treatment of the steel to achieve the shape of the closing member is thereby facilitated.
An appropriate method of monitoring the operation of forcing the closing member into the housing is represented by measuring the press-in force as a function of the travel covered by the component which is press fitted. This method permits a simple monitoring and documentation, reduced in terms of cost and time, of manufacture and permits reliably determining dimension errors, physical properties and the press
REFERENCES:
patent: 4460541 (1984-07-01), Singleton et al.
patent: 4489916 (1984-12-01), Stevens
patent: 4631095 (1986-12-01), von Hagen et al.
patent: 5333836 (1994-08-01), Fukuyo et al.
patent: 5626326 (1997-05-01), Goossens et al.
patent: 5653249 (1997-08-01), Reinartz et al.
Burgdorf Jochen
Volkmar Werner
Volz Peter
Weisbrod Helmut
ITT Manufacturing Enterprises Inc.
Lee Kevin
Lewis J. Gordon
Twomey Thomas N.
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