Metal deforming – By application of fluent medium – or energy field – With actuated tool engaging work
Patent
1996-10-03
1998-05-05
Jones, David
Metal deforming
By application of fluent medium, or energy field
With actuated tool engaging work
72 54, 72 55, B21D 915
Patent
active
057460795
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a method for the production of a valve housing with a metallic valve member.
Metallic valve members have so far overwhelmingly been produced by casting steel or aluminum and by pressing brass or forging valve blanks of steel, which are machined. In the case of cast valve blanks the homogeneity of the metal structure is unsatisfactory. There is a tendency toward carbide precipitation, intercrystalline corrosion, blowhole formation, inclusions and other structural flaws in the material. Such flaws may lead to contamination of process lines, leaks in a valve or damage thereof by corrosion. Moreover the welding properties of such valve members leave to be desired. In the case of valve members produced by pressing brass or forging steel such defects are substantially prevented, but however forging methods are extremely involved, since the entire internal space in the valve member must be produced by machining.
The U.S. Pat. No. 3,300,844 discloses producing a metallic valve housing by shaping a cylindrical tube section in an embossing mold. The shaping operation is however performed in a plurality of steps and can not be carried out while the material is cold. It requires the introduction of counter-stamps into the interior of the tube section for the formation of concave surfaces. This known method as well is complex.
The invention is to provide a method for the production of a valve housing comprising a metallic valve member, which may be implemented with a fraction of the effort or complexity of a conventional forging or shaping method and leads to valve members which are free of defects occurring with valve members produced by casting methods and furthermore only require minimum use of material.
In accordance with the method of the invention for the production of a valve housing having a metallic valve member a cylindrical tube section, which is charged with a filling material and at its ends is closed by obturating stamps, is placed in a pressing mold and deformed in the pressing mold by means of a stamp, which acts perpendicularly to the axis of the tube section from the outside and in the interior of the tube section produces the pressure necessary for shaping, which pressure is transmitted by the filling material to the internal wall surface of the tube section, the ends of the tube section remaining as tubular port connections and the center section intermediate the ends on one side of the tube section, which corresponds to the bottom of the valve member, being thrust inward with the formation of a concave surface, whereas on the oppositely placed side of the tube section an opposite surface of the pressing mold forms a flat in the wall of the tube section so that opposite to the flat two fluid guide surfaces are formed, which starting from the axial direction as defined by the port connections are directed axially inward and furthermore toward the flat and also converge in a common rib placed opposite to the flat; after removal of the filling material in the part, which corresponds to the flat, of the deformed wall surface of the tube section opposite to the rib at least one passage is produced, the part, remaining and surrounding the passage, of the flat forming a connection surface and the flow paths formed by the fluid guide surface opening into the passage.
Metal tubes of suitable quality and material composition are available for all imaginable valve applications. The deformation of a tube section by the action of pressure from the outside is without any disadvantageous effect on the nature of the material. A machining operation is unnecessary. The wall thickness of the valve member is nowhere greater than necessary so that there is an economy in weight and material. The valve members produced using the method of the invention possess similar advantages to those manufactured using conventional forging techniques, at the same time having costs of production which are only a small fraction of those involved on the application of forging methods.
There has already been a pro
REFERENCES:
patent: 3300844 (1967-01-01), Boteler
patent: 4580427 (1986-04-01), Akamatsu
patent: 5505068 (1996-04-01), Bartels
Hettinger Gerhard
Rutsch Walter
Burkert Werke GmbH & Co.
Jones David
Safran David S.
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