JP2838714B2 - Valve body - Google Patents

Description

Description: Object of the Invention (Industrial Application Field) The present invention relates to a body of a valve used for controlling a fluid, and more particularly, to a substantially cylindrical valve having an annular projection in an inner hole. Is intended to be efficiently and inexpensively manufactured and supplied by using plastic working.

(Prior art and its problems) Regarding a body of a substantially cylindrical valve having an annular projection in an inner hole, conventionally, a casting material having an annular projection or a pipe-like material or a round bar material having a thickness including the annular projection is included. And polygon bars were machined.

However, the material made by casting has the advantage that the number of machining steps is small, but the casting material itself is expensive, and in addition to the potential for casting defects, many of them are found after machining, resulting in economical efficiency and There is a problem with lack of reliability.

When a pipe-shaped material having a thickness including the annular protrusions, a round bar or a polygonal bar is machined and made, there are almost no material defects, but there are many shaving allowances, so the number of processing steps increases, There are problems such as an increase in processing cost.

SUMMARY OF THE INVENTION As described above, the present invention has a problem that a material of a body of a substantially cylindrical valve having an annular projection in an inner hole is expensive and has a material defect, and requires a large number of processing steps and a high processing cost. An object of the present invention is to provide an inexpensive and high quality valve body by solving the problems.

Configuration of the Invention (Means for Solving the Problems) The present invention is configured as follows to solve the above-described problems.

A body of a substantially cylindrical valve having an annular projection in an inner hole, wherein the upper and lower dies facing the pipe material are moved in a direction approaching each other to the material of the body to press the pipe-shaped material in the axial direction. Then, a part thereof was plastically deformed so as to protrude in the direction of the inner hole, and the plastically deformed portion was joined to an annular material for an annular projection.

Further, the body material formed as described above may be further plastically deformed to form one or more pairs of parallel surfaces on the outer peripheral surfaces at both ends.

Further, a projection for connecting the drive unit may be provided on the outer surface of the central part of the body material by welding.

After the pipe-shaped material is pressed in the axial direction and the ring-shaped material is caulked, when the ring-shaped material is pressed at the bottom dead center of the press in the same process, it is possible to obtain higher joining points and airtightness.

(Operation) The body of the substantially cylindrical valve having an annular projection in the inner hole of the present invention presses the pipe-shaped material in the axial direction and plastically deforms a part of the material so as to project in the direction of the inner hole. The body material in which the annular material is joined by the plastic deformation part may be machined into a required body shape, and the plastic deformation for this may be a simple press working, and the mold may be a simple one. The joining of the joints has a certain strength and there is no danger of seepage leakage.

Also, the machining allowance can be minimized, and the machining cost is reduced.

For this reason, there is no material defect and processing cost is lower than when made from a casting, a pipe-like material, a round bar, a polygonal bar, or the like.

In addition to the above-described plastic deformation, when one or more pairs of parallel surfaces are formed on the outer peripheral surfaces of both ends of the pipe material at the same time or subsequently, the tool hook at the time of valve piping work can be formed extremely efficiently. Can be.

Further, if a projection for driving connection is required, it may be provided by welding to the outer peripheral surface of the central portion of the material of the body, which is extremely easy.

For these reasons, the present invention makes it possible to obtain an inexpensive and substantially cylindrical valve body having an annular projection in an inner hole of high quality.

(Example) An example of the present invention will be described with reference to the drawings.

FIG. 1 is a longitudinal sectional view of a body valve showing an embodiment of the body of the present invention.

In FIG. 1, 1 is a ball valve, and 2 and 3 are bodies. The body 2 has an annular projection 2b in an inner hole 2a, and the body 3 has an annular projection 3b in an inner hole 3a. I have.

In the figure, 4 is a pair of seats, 5 is a ball, 6 is a stem, 7 is a handle, 2c and 3c are female threads for piping, and bodies 2 and 3 are female threads 2d of the body 2.
And the external thread 3d of the body 3 are screwed together and assembled.

The ball valve 1 is opened and closed by rotating the handle 7 and rotating the ball 5 via the stem 6.

2a and 2b are cross-sectional views illustrating the shape of a raw material for machining the bodies 2 and 3, and each of the raw materials 8 and 9 has pipe-shaped portions 8a and 9a and annular projections 8b and 9b. have. When the raw materials 8 and 9 are manufactured by processing a pipe-shaped material, a round bar or a square bar having a thickness including the thickness of the annular projections 8b and 9b, a very large number of steps are required.

FIG. 3 is a partial cross-sectional view showing an example of press working for producing the body material of the present invention, where 10 is a pipe-like material, 11 is an annular material, and this annular material 11 is shown in FIG. It is a material of the annular projections 2b and 3b shown. 12 is an outer mold, 13 is an upper mold, and 14 is a lower mold.

From the state of FIG. 3, one or both of the upper mold 13 and the lower mold 14 are moved in a direction approaching each other, and the pipe-shaped material 10 is moved.
When is pressed, the pipe-shaped material 10 is plastically deformed so that portions not in contact with the outer mold 12, the upper mold 13, the lower mold 14, and the annular material 11 project.

FIG. 4 is a longitudinal sectional view of the raw material 15 formed by the method shown in FIG. 3, and the overhang portion 10a of the pipe-shaped material 10 is firmly joined to the annular material 11.

The cross-sectional shape of the ring-shaped material 11 is arbitrarily selected in consideration of the strength of bonding and the final shape of the ring-shaped projection and the portion to be cut off by machining.

FIG. 5 is a partial cross-sectional view showing examples of the cross-sectional shape of the annular material 11, and the shape of the annular material 11 is not limited thereto.

FIG. 6 is a partial sectional view showing another example of the press working, and the reference numerals shown in FIG. 6 indicate the same reference numerals as in FIGS. 3 and 4.

In the method of FIG. 6, the upper mold 13 and the lower mold 14 are guided directly, not through the outer mold 12, so that the movement of the mold is smooth, and furthermore, the inner end 10b of the overhang 10a. Is compressed, so that the connection between the overhang portion 10a and the annular material 11 becomes more reliable and stronger.

Next, in FIGS. 3 and 6, the outer mold 12 has inner surfaces 12, 12a facing the outer peripheral surfaces 10c and 10d at both ends of the pipe-shaped material 10.
And the inner surface above and below 12b and the upper die 13 in contact with it.
If the outer peripheral surface 13a of the lower die 14 and the outer peripheral surface 14a of the lower die 14 have a shape having at least one pair of parallel surfaces, the upper die 13 and the lower die 14
And when moving closer, 10 of the pipe-like material
One or more pairs of parallel surfaces can be formed on the outer peripheral surfaces 10c and 10d at both ends.

FIG. 7 is a cross-sectional view of the pipe-shaped material 10 in the AA cross-sectional view of FIGS. 4 and 6 in this case.

In FIG. 1, reference numeral 16 denotes a gland member welded to the outer peripheral surface 2e of the central portion of the body 2, and similarly, a projection for connecting the drive unit is welded and provided to provide various drive devices. be able to.

 Next, the operation of the above embodiment will be described.

As shown in FIG. 1, the body 2 and 3 of the substantially cylindrical valve having the annular projections 2b and 3b in the inner holes 2a and 3a,
The pipe-shaped material 10 is pressed in the axial direction and plastically deformed so that a part thereof projects in the direction of the inner hole.
What is necessary is just to mechanically process the material 15 to which the annular material is joined into a required body shape, and the plastic deformation for this can be a simple press working, the dies 12 to 14 can be simple, and the pipe The connection between the joints of the annular material 10 and the annular material 11 is firm and firm, and there is no danger of leakage.

Also, the machining allowance can be minimized, and the machining cost is reduced.

For this reason, there is no material defect and processing cost is lower than when made from a casting, a pipe-like material, a round bar, a polygonal bar, or the like.

Further, in addition to the above-described plastic deformation, when one or more pairs of parallel surfaces are formed on both end outer peripheral surfaces 10c and 10d of the pipe-shaped material 10 simultaneously or subsequently, it is extremely efficient to use a tool during valve piping work. Can be formed.

Effects of the Invention As is apparent from the above, the present invention has the following excellent effects.

That is, the body of the valve of the present invention requires little material and is extremely economical.

Easy plastic working and low plastic working cost.

Easy machining and low mechanical processing cost.

The drive device connection projection can be easily provided by welding.

From the above, an extremely economical and highly reliable valve can be provided.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a ball valve showing one embodiment of the present invention, FIG. 2 is a sectional view showing examples of a shape of a material for machining a body, and FIG. FIG. 4 is a partial longitudinal sectional view showing an example of press working for making a body material, FIG. 4 is a longitudinal sectional view of a material formed by the method shown in FIG. 3, and FIGS. FIG. 6 is a partial longitudinal sectional view showing an example of press working, and FIG. 7 is a cross sectional view of a pipe-shaped material taken along line AA of FIGS. 4 and 6. 2, 3, ... body, 2a, 3a ... inner hole 2b, 3b ... tubular projection, 2e ... central outer surface 8, 9, 15 ... material, 10 ... pipe-shaped material 10c, 10d ... both ends outer circumference Surface 11 ... An annular material.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-61-242732 (JP, A) JP-A-62-155280 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) F16K 27/00-27/12 F16K 5/06

Claims (3)

(57) [Claims] 1. A substantially cylindrical valve body having an annular projection in an inner hole, the upper and lower dies facing the pipe material are moved in a direction approaching each other to a material of the body, so that the pipe-shaped material is moved. A body for a valve, wherein the body is plastically deformed so as to be pressed in the axial direction so that a part of the valve is extended in the direction of an inner hole, and the plastically deformed portion is joined to an annular material for an annular projection. 2. A valve body according to claim 1, wherein the body material is further plastically deformed to form at least one pair of parallel surfaces on the outer peripheral surfaces at both ends. 3. The body of a valve according to claim 1, wherein a projection for connecting the driving portion is provided by welding on an outer surface of a central portion of the material of the body.