JPS63295042A - Main body for butterfly valve and its production - Google Patents

Abstract

PURPOSE:To enable casting in vertical molding perpendicularly standing front and rear faces by crossing a stiffening rib forming on the outer peripheral face of a main body to parting plane for casting at right angle, to pull out a core print toward perpendicular direction at the time of casting. CONSTITUTION:Bearing parts 11, 12 for valve rod are provided at facing position of radius direction of a butterfly valve main body 10 having hollow cylindrical shape and the stiffening rib 13 is formed at outer peripheral face. The stiffening rib 13 is arranged at the right angle crossing direction to the parting plane 14 at the time of casting. As the stiffening rib 13 is formed at the right angle crossing direction to the parting plane 14 for casting as such a way, the core print 15 can be pulled out toward perpendicular direction. Therefore, the casting in the vertical molding perpendicularly standing the front and rear faces of the main body 10 can be executed, and the casting product has much vertical planes and casting flaw and the other flaw are difficult to develop. Further, as the pull-out of the core print 15 can be executed with only toward perpendicular direction, the working man-hour is reduced and development of the product having defect can be prevented.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a method for manufacturing a valve body of a butterfly valve, and firstly, the present invention relates to a method for manufacturing a valve body of a butterfly valve. The present invention relates to the prescribed structure of the main body and its manufacturing method.

(Prior Art) Conventionally, a butterfly valve has a disc-shaped valve body rotatably housed in a hollow cylindrical body, and the inner peripheral surface of the body and the outer circumferential surface of the valve body are brought into contact with and separated from each other to connect and disconnect a flow path. is well known, and various diameters have been put into practical use.

Among butterfly valves, medium to large diameter butterfly valves with a diameter of 300i+y or more generally have reinforcing ribs formed on the outer peripheral surface of the main body in order to satisfy the strength and weight reduction of the hollow cylindrical main body. . By the way, such reinforcing ribs are
Utility Model No. 45-31520 or Utility Model Application No. 59-144
As seen in Japanese Patent No. 262, it has a shape and directionality that extend radially toward the center of the valve.

(Problems to be Solved by the Invention) Such a hollow cylindrical main body (1) having reinforcing ribs (2).
) by the casting method, the front and rear surfaces of the main body are arranged horizontally as shown in Figures 9 to 11, and the baseboard (3) is divided into three parts and reinforced as shown in Figure 8. An initial method of pulling out along the direction of the ribs has been implemented.

The structure of the casting is 1 m denser in the lower part than in the upper part during II production.
The material is superior, with fewer cavities and other defects.The lower surface of the horizontal or sloped surface of the casting is cleaner than the upper surface, with no flaws such as young fruits or impurities.It is better to cast on the horizontal surface than on the vertical surface. Because it has characteristics such as being prone to scratches and other scratches,
Considering these characteristics, it is desirable that the butterfly valve body, which is a pressure vessel, be constructed using an IB construction method that increases vertical rigidity.

However, since the reinforcing ribs of the conventional butterfly valve body were formed in a radial manner, it was difficult to adopt an optimal casting method that takes such casting characteristics into consideration.

(Means for Solving the Problems) In order to solve the above problems, the structure of the butterfly valve main body adopted in the first invention is a hollow cylindrical butterfly valve main body, which is formed on the outer peripheral surface of the main body. The reinforcing rib is orthogonal to the gI cutting face.

Also, P for manufacturing the butterfly valve body of the first invention.
In the invention of t42, the reinforcing ribs formed on the outer peripheral surface of the main body are
When casting a hollow cylindrical butterfly valve body that is perpendicular to the casting face, the front and rear surfaces of the body are made perpendicular,
It is characterized by the use of a casting method in which the baseboard is pulled out in the vertical direction.

(Function) Since the reinforcing ribs are formed in a direction perpendicular to the cutout surface, the baseboard can be pulled out in the vertical direction during casting, and as a result, the butterfly valve body can be aligned vertically with the front and rear surfaces. It can be cast by making a hollow.

(Effects of the Invention) According to the present invention, the butterfly valve body having medium and large diameter reinforcing ribs can be cast by recessing.
It is possible to obtain a high-quality product with few scratches and other scratches, and the baseboard only needs to be pulled out in the vertical direction, which simplifies the casting method and reduces the number of steps.

(Embodiments) The structure of the butterfly valve body according to the present invention and the most preferred embodiment of the casting method therefor will be described in detail below with reference to FIGS. 1 to 6.

Figure 1.2 shows the butterfly valve body (10) according to the present invention.
It has a hollow cylindrical shape, has valve stem pongee receivers (11) and (12) at radially opposite positions, and has reinforcing ribs (
13) is formed. The reinforcing rib (13) extends in a direction perpendicular to the parting surface (14) during casting.

In the illustrated embodiment, the parting surface (14) coincides with the valve axis direction.

In this way, since the reinforcing ribs (13) are formed in the direction perpendicular to the side face (14), the baseboard (15) is formed in the vertical direction (upward direction) shown by the arrow, as shown in Fig. 3. ) can be extracted. Although Figure 3 shows only the upper half, the lower half also has the same baseboard and can be removed in the vertical direction (downward) in the same way, instead of using a three-part baseboard as in the past. (16) indicates the core.

In addition, in this invention, since the baseboard can be removed in the vertical direction, the main body (10) can be removed as shown in FIGS.
It became possible to adopt a casting method in which the front and rear surfaces of the cylinder were vertically positioned. In addition, due to the vertical vertical arrangement of maimono, maimono becomes more vertical and hard, making it difficult for dance wounds and other wounds to form. Furthermore, since the baseboard only needs to be removed in the vertical direction, the casting method is simplified, the number of steps is reduced, and the occurrence of defective products can be prevented.

[Brief explanation of drawings]

FIG. 1 is a perspective view of the butterfly valve main body according to the present invention, m
Figure 2 is a partially sectional front view, Figure fjS3 is a diagram showing the arrangement of baseboards and cores, Figures 4 to 6 are diagrams showing the slope method according to the present invention, and Figure 7 is a conventional butterfly valve. A partially sectional front view of the main body, FIG. 8 is a diagram showing the arrangement of baseboards and cores in the conventional casting, and FIGS. 9 to 11 are diagrams showing the conventional casting method. (10)...Butterfly valve body HB (12)...Valve stem pongee receiver (13)...Reinforcement rib (14)...Semi-finished face (15)...Width
Tree (16)...Nakako Figure 1 Figure 7 Figure 3 Ward Dou Ward

Claims (2)

[Claims] (1) A butterfly valve main body having a hollow cylindrical shape, characterized in that reinforcing ribs formed on the outer peripheral surface of the main body are orthogonal to a casting parting surface. (2) When casting a hollow cylindrical butterfly valve body in which the reinforcing ribs formed on the outer circumferential surface of the main body are perpendicular to the casting parting surface, the front and rear surfaces of the main body are made vertical, and the baseboard is placed vertically. A method of manufacturing a butterfly valve body, characterized by using a casting method in which the butterfly valve body is extracted.