JP3400941B2 - Lug type valve body and its casting mold production type - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a body of a lug type valve having a plurality of lugs projecting from an outer peripheral surface of a body and a die suitable for producing a casting die thereof.

[0002]

2. Description of the Related Art In a conventional lug type valve body (1), a plurality of lugs (3) are provided on the outer peripheral surface of a body (2) as shown in FIG. As described above, the lug portions (3) are individually coupled to the body portion (2).
In the case where a plurality of independent lugs (3) are provided on the outer peripheral surface of the body (2) as described above, a cavity is formed in the thick lug (3) during casting of the valve body (1). easy.

Further, since the connecting position of the body portion (2) and the lug portion (3) is limited to only the base end of the lug portion (2), it is provided in the manufacturing die used for producing the casting die. The lug is easy to fall down,
Alternatively, the valve body is easily distorted, so the valve body
It was difficult to improve the dimensional accuracy of (1).

Further, a conventionally known split mold is used for casting the valve body (1), but since the joint portion of the casting mold is located at the center portion between the faces of the body (1), the split mold shown in FIGS. As shown in, the burr (4) is formed in the center part between the faces of the body (1)
Will occur. Therefore, in general, the burr (4) is shaved off manually by a grinder (5) or the like. However, since the lug portion (3) becomes an obstacle during such a deburring work, it takes a long working time and the valve as a whole. There was a problem that the production efficiency of the body (1) was reduced.

[0005]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems of the conventional valve body and improves the joint structure of the body portion and the lug portion, thereby improving the production efficiency. The present invention provides a shaped valve body and a mold for casting the same.

[0006]

[Means for Solving the Problems] The means adopted by the present invention in order to solve the above-mentioned problems is to reduce the number of bolts on the outer circumference of the body.
A plurality of corresponding lugs are provided in a projecting manner, and bolt insertion holes are provided in the lugs.
In a cast body of a lug-shaped valve with a perforated hole, a thin flange-shaped substrate is provided in the vicinity of the center of the outer circumference of the body part, and adjacent lugs are joined through the substrate to cast the substrate.
It is characterized by using chilled money at the time of manufacturing .

It should be noted that the protruding height of the substrate can be made substantially the same as the protruding height of the lug portion, or the protruding height of the substrate can be gradually lowered as the distance from the lug portion increases.

Further, according to the present invention, there is provided a die for manufacturing a casting die for a lug type valve body, in which a thin flange-shaped substrate for connecting between adjacent lug portions is provided near the center of the outer periphery of the body portion in the inter-plane direction.
It is composed of a body part component provided with a thin flange-shaped substrate in the center portion between the outer peripheral surfaces of the body part and a lug component movably attached to the surface of the substrate formed on the body part component. Characterize.

[0009]

DETAILED DESCRIPTION OF THE INVENTION Referring to FIGS.
A preferred embodiment of the present invention will be described in detail. still,
Portions having substantially the same functions as those of the conventional example shown in FIGS. 9 to 12 are designated by the same reference numerals, and detailed description thereof will be omitted.

In FIG. 1, a thin flange-like substrate (6) is provided in the vicinity of the center of the outer peripheral surface of the body (2) having a plurality of lugs (3) protruding in the center of the outer peripheral surface. By providing
Adjacent lugs (3) are connected via the substrate (6). In the embodiment shown in FIG. 1, a circular outer diameter substrate (6) connecting the tops of the lugs (3) is provided.
The height of (6) does not have to be the same over the entire circumference, and as the protruding height of the substrate (6) is separated from the lug portion (3) as in the embodiment shown in FIG. 2, for example. By gradually lowering, the board is more than the straight line connecting the vertices of the adjacent lugs (3).
It is possible to prevent (6) from protruding, and thereby prevent damage to the substrate (6) when the valve body (1) is placed on the floor or the like.

A valve body (1) having the above structure
Is a lug portion adjacent to the thin flange through the substrate (6).
(3) is combined. Therefore, during casting of the valve body (1), since the substrate (6) functions as a chiller for the lug portion (3), the molten metal is injected from the portion of the substrate (6) so that the lug portion ( It is possible to avoid the generation of the nest of 3). Also, the base plate (6) has a body (2) and an adjacent lug (3).
Since it functions as a reinforcing plate connected to, the distortion of the body portion (2) and the collapse of the lug portion (3) are prevented, and the dimensional accuracy is improved.

The substrate (6) does not necessarily have to be located at the center of the body portion (2) in the inter-plane direction, but is located within the thickness range of the lug portion (3) and is adjacent to the lug portion (3). The intended purpose can be achieved by contacting us.

Further, the valve body having the above structure
When (1) is produced by casting using a split mold, burrs (4) are formed on the substrate (6) as shown in FIGS. 3 and 4.
However, since such a burr (4) is formed on the tip portion of the substrate (6), the burr (4) can be easily scraped off even by a manual work such as a grinder (not shown). The production efficiency of (1) can be increased.

On the other hand, as described above, the casting die (7) for the valve body (1) having the substrate (6) connecting the adjacent lugs (3) to the outer peripheral surface of the body (2) is manufactured. The mold (8) is composed of a wooden mold or a metal mold.

Further, as shown in FIGS. 5 and 6, the manufacturing die (8) has a body formed by forming only a body (2) of the valve body (1) and a portion corresponding to the substrate (6). Parts (9) and lugs
It is composed of a lug component (10) corresponding to a portion which does not overlap with the substrate (6) in (3), and this lug component (10) is moved to the surface of the body equivalent component (9) corresponding to the substrate. It is installed and configured as possible. The lug part (10) can be attached to the body part (9) by inserting or fitting.

Therefore, when the number of bolts changes in the valve body (1) having the same diameter, for example, as shown in FIGS. 7 and 8, the number of lug parts corresponding to the number of bolts is increased.
Since it is sufficient to attach the (10) to a position corresponding to the base plate portion of the body part component (9), it is possible to produce the casting molds (7) of different standards by using the common parts. The production cost can be reduced.

Although the present invention is applied to the valve body of the lag type butterfly valve in the embodiments, the present invention can also be applied to the valve body of a gate valve or a ball valve.

[0018]

As described above, according to the lug type valve body of the present invention, it is possible to avoid the distortion of the body and the collapse of the lug due to the reinforcing action of the substrate provided on the outer peripheral surface of the body. Get higher Further, since the substrate functions as a chiller for the lug portion, pouring of the molten metal from the portion of the substrate can prevent generation of cavities in the lug portion having a large thickness. Further, the burr generated during casting can be easily removed only by moving the grinder or the like along the outer circumference of the substrate, so that the production efficiency of the valve body can be increased.

On the other hand, according to the invention described in claim (4),
In order to obtain casting molds of different standards despite using common parts, such as changing the number or positions of lug parts attached to the surface of the body equivalent part of the board, The production cost of the casting mold can be reduced.

[Brief description of drawings]

FIG. 1 is an external perspective view showing an embodiment of a lug type valve body according to the present invention.

FIG. 2 is an external perspective view showing another embodiment of the lug type valve body according to the present invention.

FIG. 3 is a partially enlarged front view of the valve body shown in FIG. 1 during production.

FIG. 4 is a side view of FIG.

FIG. 5 is a front view showing an example of a casting die for a lug type valve body and a die for producing the same according to the present invention.

6 is a side view of FIG.

FIG. 7 is a front view showing another example of a casting mold for a lug type valve body according to the present invention and a mold for manufacturing the same.

8 is a side view of FIG.

FIG. 9 is an external perspective view showing a conventional example of a lug type valve body.

10 is an enlarged front view of a lug portion of the valve body shown in FIG.

FIG. 11 is a partially enlarged front view showing a burr formed on a conventional lug type valve body.

FIG. 12 is a side view of FIG.

[Explanation of symbols]

(1) Valve body (2) Body (3) Rug part (4) Bali (5) Grinder (6) Substrate (7) Casting mold (8) Casting die manufacturing die (9) Body parts (10) Parts for lugs

Continuation of the front page (56) References JP-A-8-303610 (JP, A) JP-A-10-153266 (JP, A) JP-A-63-295042 (JP, A) Actual Kaihei 6-80072 (JP , U) Actual Kai 61-101152 (JP, U) Japanese Patent Sho 59-39630 (JP, B1) Actual Kohei 3-2063 (JP, Y2) Actual Kohei 3-2062 (JP, Y2) (58) Fields investigated (Int.Cl. ⁷ , DB name) F16K 27/00-27/12 F16K 1/16-1/226 B22C 7/02 B22C 21/00

Claims (4)

(57) [Claims] 1. A cast body of a flag-shaped valve, wherein a plurality of lug portions corresponding to the number of bolts are provided on the outer periphery of the body portion, and bolt insertion holes are formed in the lug portions. A thin-walled flange-shaped substrate is provided near the center of the outer peripheral surface, and adjacent lugs are joined through the substrate to cool the substrate during casting.
The lug type valve body is characterized by 2. The lug type valve body according to claim 1, wherein the protruding height of the substrate is substantially the same as the protruding height of the lug portion. 3. The lug type valve body according to claim 2, wherein the protruding height of the base plate is gradually reduced as the distance from the lug portion is increased. 4. A mold for producing a casting mold for a lug-shaped valve body, wherein a thin flange-shaped substrate for connecting between adjacent lugs is provided near the center of the outer circumference of the body in the direction of the surfaces. Manufacture of a lug type valve body casting mold including a body part component provided with a thin flange-shaped base plate in the central portion in the direction and a lug part component movably attached to the surface of the base plate formed on the body part component Type.