JP3127258B2 - Method of forming ball for ball valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for forming a ball for a ball valve, which is mounted on a pipe for water, oil, gas or the like and used for controlling a fluid.

[0002]

2. Description of the Related Art A ball 22 used in a ball valve 21 as shown in a vertical sectional view of FIG. 5 has conventionally been produced by various methods. FIG. 6 is a processing step diagram showing an example in the case of making a round bar material by cutting, in which a round bar cutting material 23a shown in (h) is replaced with a spherical outer shape 23b as shown in (i).
And a cylindrical channel hole 23c, and a concave groove 2 for connection with a stem as shown in (j).
3d is cut to make a ball 23 for a ball valve. The ball 23 is often plated with chrome or the like.

FIG. 7 shows an example 24 of a ball made by casting.
FIG. 4 is a longitudinal sectional view showing cutting and polishing of an outer shape 24a. In many cases, the passage holes 24b are also cut or polished. The hollow portion 24c is provided for weight reduction and material saving. 24d is a concave groove for connection with the stem, and 24e is a hole for sand removal. The ball 24 is often plated.

FIG. 8 is a longitudinal sectional view showing another example of a ball made by casting. This ball 25 also has an outer diameter 25a that has been subjected to cutting and polishing and has been plated. There are many. 25b is a concave groove for connection with the stem.

FIG. 9 is a working process diagram showing an example of a case of using a pipe material, and shows a pipe 26a cut to a required length shown in FIG. 26d having such entrances 26b and 26c
Then, a small-diameter pipe 26e cut to a required length as shown in (m) is inserted therein, and both ends are welded. Further, as shown in (n), the outer shape 26f is cut or polished. In addition, the concave groove 26g for connection with the stem is cut and plated to form the ball 26.

The spherical body 26d shown in the above (1)
In addition, as shown in (o), a concave groove 26h for connection to the stem may be formed by press working, and the outer shape 26i may be cut or polished and plated to form a ball 26j.

[0007]

In the above-mentioned conventional method of making a ball by cutting from a round bar as shown in FIG. 6, a large number of portions are to be cut off, wasteful material is required, and the processing time is long and the cost is high. Further, since there is no hollow portion, a large-diameter one becomes extremely heavy.

In the case of manufacturing by casting as shown in FIGS. 7 and 8, defects such as cavities are often found after spherical processing, and in this case, material and processing time are wasted. Further, in the case of casting, it is necessary to make the wall thickness thicker due to the molten metal flow and shape instability, so that the cutting allowance is large and the processing requires a lot of time. These are extremely expensive.

Although the shape shown in FIG. 8 can be made relatively light and the price can be somewhat reduced, the flow of the fluid flowing in the ball 25 is disturbed and the fluid resistance becomes large. Foreign matter may accumulate or accumulate inside the ball 25, which may flow out and adversely affect the ball valve and the piping system.

When the pipe is made using the pipe material shown in FIG. 9, the relationship between the pipe diameter and the wall thickness is limited, and the pipe is generally soft, easily deformed, and difficult to handle. Further, as shown in FIG. 9 (m), it is necessary to weld both ends of the pipe 26e to the spherical body 26d, which is troublesome because the welded portion is relatively thin and easily deformed by heat. It is.

When the shape shown in FIG. 9 (o) is used, the material is lightweight and both the material cost and the processing cost are low. However, as in the case of the ball 25 shown in FIG. Easy to wake up.

The ball valve ball of the present invention has been developed in order to solve the above-mentioned various problems of the ball valve balls manufactured by various conventional methods shown in FIGS. The purpose is to reduce material and processing costs, improve yield, and reduce weight and strength, and cause turbulence of fluids and accumulation or deposition of foreign matter in balls. And to improve the function of the valve.

[0013]

In order to achieve the above-mentioned object, the present invention provides forging a forging material made of a metal material, and arranges an outer cylinder and an inner cylinder in a double cylinder shape. Forming an intermediate body having a disk-shaped partition wall at a substantially central portion in a longitudinal direction, and then pressing the intermediate body to form the outer cylinder into a spherical shape; This is a ball forming method.

Another means is to forge a forging material made of a metal material to form an intermediate body which is a double cylindrical body of an outer cylinder and an inner cylinder with a bottom. A method for forming a ball for a ball valve, comprising: friction-welding the bottom of the intermediate body with the bottom; and then pressing the intermediate body to form the outer cylinder into a spherical shape.

Further, when the bottom of the disk-shaped partition or the double cylindrical body with the bottom is formed by removing the inner diameter portion from the inner cylinder, the subsequent processing is facilitated. Further, it is preferable to form the ball by performing a required cutting process or the like after forming the outer cylinder into a spherical shape by press working the intermediate shape body.

When the forging material made of the above metal material is a brass material, it is easy to forge, press, etc., and the production effect of the present invention is large.

The ball for a ball valve according to the present invention comprises:
Hot forging of the forging material to form an outer cylinder that becomes the outer shell of the ball and an inner cylinder that becomes the flow path. You can make economic balls that are not.

Further, since the cylindrical flow path is formed, the flow of the fluid is not disturbed and the fluid resistance is not increased, and foreign matter accumulates or deposits in the ball. And the piping system is not adversely affected.

Further, a portion outside the inner cylinder of the partition wall remains in the ball, which serves as a reinforcing member for preventing deformation of the ball. Even if the body cavity of the ball valve abnormally rises in pressure due to temperature rise or the like. This ball is hardly deformed.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a processing step diagram showing an example of manufacturing a ball for a ball valve of the present invention.
1 is a ball for a ball valve, 2 is a forging material made of a metal material, 3 is an intermediate body, 4 is an outer cylinder, 5 is an inner cylinder, 6 is a disk-shaped partition wall, and 7 is a double cylinder with a bottom. 4a is its outer cylinder, 5a is its inner cylinder, and 6a is its bottom.

FIG. 1A shows a forging material 2 made of a metal material. In this embodiment, a brass rod having a required thickness is cut to a required length. (B) has shown the intermediate | middle shape body 3 which shape | molded the forging raw material 2 by hot forging, and this intermediate | middle shape body 3 has the outer cylinder 4 and the inner cylinder 5 arranged in a double cylinder shape, A disk-shaped partition wall 6 is provided at the center in the longitudinal direction.

(C) shows a spherical body 8 in which the intermediate body 3 is cold-pressed to form the outer cylinder 4 into a spherical shape and the inner diameter portion 6b is punched out of the inner cylinder 5 of the partition wall 6. In this embodiment, both ends of the outer cylinder 4 deformed by press working are pressed against both ends of the inner cylinder 5. This crimped portion may be welded or brazed, or the outer shape 9 and the through hole 10 described later may be cut or polished as it is.

(D) shows a case in which a concave groove 11 for connection with a stem is cut in the spherical body 8 and the outer shape 9 and the flow path hole 1 after that are cut.
1 shows a ball 1 for a ball valve which is completed by performing required processing such as cutting, polishing, plating, and the like.

FIGS. 1 (e), 1 (f) and 1 (g) show another method for producing the above-mentioned intermediate shaped body 3, and FIG.
Shows the forging material 12 in this case, and two of them are half the length of the forging material 2. (F)
The figure shows a double cylindrical body 7 with a bottom formed by hot forging a material 12 for forging. The double cylindrical body 7 with a bottom has an outer cylinder 4a and an inner cylinder 5a on a bottom 6a. And have a double cylindrical shape.

(G) shows an intermediate body 13 formed by friction-welding the bottoms 6a and 6a of the two cylindrical bodies 7 with bottoms. The intermediate shape body 3 shown in (b) has the same shape.

The intermediate body 3 formed by hot forging the forging material 2 shown in (a) has a partition 6 extending from the inner cylinder 5 to the inner diameter portion 6b as shown in (b). However, when hot forging is performed on the intermediate body 13 having a shape in which the inner diameter portion 6b is missing from the inner cylinder 5 of the partition wall 6 as shown in the cross-sectional view of FIG.

Similarly, the double cylindrical body 7 having a bottom formed by hot forging the forging material 12 shown in FIG.
Although the bottom 6a extends from the inner cylinder 5a to the inner diameter portion 6c as shown in FIG. 1F, the inner diameter portion 6c is missing from the inner cylinder 5a of the bottom 6a as shown in the sectional view of FIG. When hot forging is performed on the double cylindrical body 14 with a bottom having the above-described shape, subsequent processing is facilitated.

Further, the intermediate body 3 shown in FIG.
When forming into a spherical body 8 shown in FIG. 1 (c) by cold pressing, the inner portion 6b is not punched out from the inner cylinder 5 as shown in the sectional view of FIG. It may be done by a later cutting process, so that
Cold pressing becomes simple and easy.

As described above with reference to FIGS. 1 to 4, the ball 1 for a ball valve according to the present embodiment is obtained by hot forging a forging material 2 or 12 into an outer cylinder 4 which becomes an outer shell of the ball 1.
Alternatively, since the 4a and the inner cylinder 5 or 5a serving as a flow path are formed, an economical ball 1 having an optimum thickness, being strong, not too heavy, and not requiring excessive material and processing can be produced.

Further, since the flow path is formed by the inner cylinder 4 or 4a, the flow of the fluid is not disturbed and the fluid resistance is not increased, and foreign matter accumulates or deposits in the ball 1 and flows out. This does not adversely affect the ball valve or the piping system.

Further, a portion of the partition wall 6 or the bottom 6a outside the inner cylinder 5 or 5a remains in the ball 1, which serves as a reinforcing member for preventing the deformation of the ball 1, and causes the body cavity of the ball valve to increase in temperature. This ball 1 hardly deforms even if the pressure is abnormally increased due to the above.

[0032]

As described above, the ball for a ball valve according to the present invention can reduce material costs, processing costs, etc., is optimal in thickness, is strong, is lightweight, and is extremely economical. It is. In addition, since a cylindrical flow path is formed, the fluid resistance is small, foreign matter does not accumulate or deposit in the ball, and the outflow of these does not adversely affect the ball valve or the piping system. . Furthermore, even if the ball is strong due to the presence of the partition wall and the body cavity of the ball valve is abnormally pressurized due to a rise in temperature, the ball hardly deforms.

[Brief description of the drawings]

FIG. 1 is a processing step diagram showing one embodiment of manufacturing a ball for a ball valve of the present invention.

FIG. 2 is a cross-sectional view showing another example of the intermediate body in the process of manufacturing the ball for a ball valve of the present invention.

FIG. 3 is a cross-sectional view showing another example of a double cylindrical body with a bottom in the process of manufacturing the ball for a ball valve of the present invention.

FIG. 4 is a cross-sectional view showing another example of a spherical body in the process of manufacturing the ball for a ball valve of the present invention.

FIG. 5 is a longitudinal sectional view showing an example of a ball valve.

FIG. 6 is a processing step diagram showing a conventional example of a method of making a ball by cutting a round bar.

FIG. 7 is a longitudinal sectional view showing a conventional example of a ball made by casting.

FIG. 8 is a longitudinal sectional view showing a conventional example of a ball made by casting.

FIG. 9 is a processing step diagram showing a conventional example of a method of making a ball using a pipe material.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Ball for ball valve 2, 12 Material for forging 3, 13 Intermediate body 4, 4a Outer cylinder 5, 5a Inner cylinder 6 Partition wall 6a Bottom 6b Inner diameter part from inner cylinder 7, 14 Double cylinder

Continuation of the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B21D 51/08 B21D 51/16 B21K 1/24 F16K 5/06

Claims (5)

(57) [Claims] 1. An intermediate shape having a forging material made of a metal material, an outer cylinder and an inner cylinder arranged in a double cylinder, and a disk-shaped partition wall at a substantially central portion in a longitudinal direction thereof. A method for molding a ball for a ball valve, comprising: molding a body; and press-forming the intermediate body to form the outer cylinder into a spherical shape. 2. A forging material made of a metal material is forged to form an intermediate body which is a double cylindrical body of an outer cylinder and an inner cylinder with a bottom. And a bottom being friction-welded, and then pressing the intermediate body to form the outer cylinder into a spherical shape. 3. The method for forming a ball for a ball valve according to claim 1, wherein an inner diameter portion is removed from an inner cylinder at a bottom of the disc-shaped partition wall or the bottomed double cylindrical body. . 4. The ball according to any one of claims 1 to 3, wherein the intermediate shape body is pressed to form the outer cylinder into a spherical shape, and then subjected to a required cutting process or the like to form a ball. The method for forming a ball for a ball valve according to the above item. 5. The method for forming a ball for a ball valve according to claim 1, wherein the forging material made of a metal material is a brass material.