Process for producing a substantially tubular housing substantia

Details Process for producing a substantially tubular housing substantia Process for producing a substantially tubular housing substantia

1997-01-12

1999-12-28

Young, Lee

Metal working

Method of mechanical manufacture

Valve or choke making

29890124, 2989013, 29412, 294211, 251310, 138120, B23P 1100

Patent

active

060064315

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

1. Field of the Invention
The invention relates to a process for producing a substantially tubular housing substantially closed on all sides, particularly a valve housing, which has at least two housing parts detachably connected together.
2. Description of Relevant Art
When manufacturing such housings, which have to be pressure-tight in the case of valve housings, the two housing parts are usually made separately from blanks, e.g. castings, which are then provided with the necessary connecting means by mechanical machining, in order to be able to connect the housing parts together in a pressure-medium-tight manner after the internal parts of the valve have been installed.
Although such housings meet high quality demands they are expensive to make. For valves produced in large quantities it would be desirable to be able to make the valve housing more cheaply without compromises as regards the security of the connection of the housing parts.


SUMMARY OF THE INVENTION

To achieve this object the invention provides a process for producing a substantially tubular housing substantially closed on all sides, particularly a valve housing, which has at least two housing parts detachably connected together comprising a) producing an intermediate product, which corresponds to the form of the first housing part in a first section thereof and to the form of at least one further housing part in at least one further section thereof by internal high-pressure forming from a substantially sleeve-shaped blank; b) cutting through the intermediate product at least one separating surface (T) lying between said at least two sections to form said at least two housing parts; and c) joining the housing parts in pressure-tight manner.
In the process according to the invention, the per se known internal high-pressure forming process is used to produce the housing contour. With this process it is also possible to produce relatively complicated deviations from the precisely tubular basic geometry of the housing inexpensively and with a constant wall thickness. As the forming takes place by flow of material and not by metal removal, the housing has good mechanical strength.
Advantageous further developments of the invention are quoted in sub-claims.
The further development of the invention makes it possible to allow the connection sections of the two housing parts to overlap in axial direction which is of advantage in respect of a simple mechanically loadable and flow-medium-tight connection of the two housing parts.
Preferably the two housing parts are connected by means of a thread connection which can be simply produced according to the invention.
The invention will be described in greater detail below with the aid of an embodiment with reference to the drawings, in which:


BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 shows an axial section through an intermediate product which is used in the manufacture of a two-part valve housing;
FIG. 2 shows a transverse section through the intermediate product according to FIG. 1 along the line II--II therein;
FIG. 3 shows an angled transverse section through the intermediate product according to FIG. 1 along the line III--III therein; and
FIG. 4 shows a similar view to FIG. 1, but in which the two housing parts of the valve housing are reproduced after cutting of the intermediate product of FIG. 1 and after slight mechanical finish-machining.


DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS

FIG. 1 shows an intermediate product, denoted by 10 overall, which is later cut through at a separating plane T to produce two screw-connectable housing parts of a valve housing. The intermediate product 10 has two front walls 12, 14, each of which carries a connection piece 16 and/or 18.
At the bottom end of the intermediate product 10 a transverse connection piece 22, which later represents the outlet connection piece of the valve housing, is moulded on in the vicinity of the connection piece 18 which later represents the inlet connection piece of the valve housing.
The intermed

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