JPH0615533A - Method for manufacturing valve body of butterfly type valve device - Google Patents

Abstract

(57) [Summary] [Purpose] To easily and efficiently manufacture a valve body for a butterfly type valve device. [Structure] A plurality of valve work pieces 1'of an ingot 11 are connected to each other with a runner 12 so as to be parallel to each other and inclined at a predetermined angle. ) If the outer peripheral surface 1'a is finished and ground by rotating it around 12, the ingot 11 rotates in a perfect circle, so the most troublesome machining of the inclined surface of the outer peripheral surface of the long diameter portion is required for a large number of valve work pieces 'Can be done simultaneously and efficiently.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for easily and efficiently manufacturing a valve body of a butterfly type valve device.

[0002]

2. Description of the Related Art FIGS. 4 to 6 show a valve body (1), a valve drive shaft (2) and a support shaft (3) of a butterfly type valve device.
As shown in FIG. 5, the valve drive shaft (2) and the support shaft (3) are press-fitted into mounting holes (5) formed in the left and right bulges (4).

When the valve body (1) is incorporated in a valve shaft (not shown) and the valve is closed, a predetermined angle (for example, 60 °) is formed with respect to the axis of the valve box.
An inclined elliptical plate shape, the outer peripheral surface of the long diameter part
(1a) is formed on an inclined surface parallel to the central axis so as to be in close contact with the inner surface of the valve box when the valve is closed.

FIG. 2 shows a cast ingot (6) for producing a valve body (1) by a conventional method. The runners (7) aligned in a straight line are connected to the runners (7). A large number of valve disc works (1 ') are formed in parallel with each other at predetermined intervals orthogonally to each other, and the outer peripheral surface (1'a) thereof has an elliptical shape in a front view.

After dividing the ingot (6) into each valve disc work (1 ') and finishing grinding both side surfaces, as shown in FIG. Predetermined angle
It is sandwiched by a pair of jigs (8) that incline (for example, 60 °), and while the jig (8) is rotated around the axis, the peripheral surface (1a) is finish ground to an inclined surface shape, and finally expanded. A valve body (1) is formed by forming a mounting hole (5) in the projecting portion (4).

[0006]

In the above method, when the outer peripheral surface (1'a) of the long diameter portion of the valve work (1 ') is ground into an inclined surface, the valve work (1') is viewed from the front. Since it has an elliptical shape, it is necessary to separate the valve body works (1 ') one by one and incline and grind them by a special jig (8) so that they rotate in a perfect circle. It was very troublesome and inefficient.

It is an object of the present invention to provide a method of manufacturing a valve body which can be manufactured easily and efficiently by processing each valve work in an ingot state immediately after casting.

[0008]

In order to achieve the above object, the present invention is a method for manufacturing a valve body having an elliptical shape and the outer peripheral surfaces of both long diameter portions being inclined surfaces. A plurality of valve bodies having substantially the same shape as the valve body to be parallel to each other so as to be parallel to each other and inclined at a predetermined angle, and cast an ingot continuous with each other with an appropriate runner, It is characterized in that the outer peripheral surface is finished and ground to a predetermined diameter by being rotated to a predetermined angle and then cut into individual valve work pieces.

[0009]

According to the present invention, the valve work of the ingot is
Since the runners are connected to each other so that they are parallel to each other and inclined, if the ingot after casting is rotated around the central axis as it is and the outer peripheral surface is cut, the ingot will rotate in a perfect circle. Therefore, the outer peripheral surfaces of the long diameter portions of many valve work pieces of the ingot are necessarily inclined surfaces.

Since it is only necessary to divide this into individual valve work pieces and finish grinding the runners on both sides, it is extremely efficient as compared with the conventional individual processing method.

[0011]

FIG. 1 shows an ingot (11) cast to manufacture a valve body (1) according to the method of the present invention. In the double channel (12) that doubles as a conduit, a large number of valve work pieces that are parallel to each other at predetermined intervals
(1 ') is formed continuously obliquely.

Each valve body work (1 ') has an inclination angle (for example, 60) with respect to the central axis when the valve body (1) after fabrication is incorporated into a valve box (not shown) and the valve is closed. Angle).

The ingot (11) is chucked on a lathe or the like, rotated around the runner (12), and the outer peripheral surface (1 ') of each valve work (1') is rotated by the cutting tool (B) until it has a predetermined diameter. Grind'a).

Then, the ingot (11) is divided into individual valve body works (1 '), the runners (12) on both sides are finish ground, and finally both mounting holes (5) are drilled. A desired valve body (1) in which the outer peripheral surface of the long diameter portion has a predetermined inclined surface is obtained.

[0015]

According to the method of the present invention, it is possible to grind the outer peripheral surfaces of a large number of valve work pieces into correct shapes and dimensions at once without using a special jig. It can be manufactured and productivity is significantly improved. If the runner is connected to the center of the valve work, centering during ingot processing becomes easy.

[Brief description of drawings]

FIG. 1 is a side view of an ingot used in the method of the present invention.

FIG. 2 is a side view of an ingot used in a conventional method.

FIG. 3 is a side view schematically showing a procedure for grinding a peripheral surface of a valve body work by a conventional method.

FIG. 4 is an exploded front view of a valve body, a valve shaft, and a support shaft.

5 is a cross-sectional view taken along the line AA of FIG.

6 is a view taken along the line BB of FIG.

[Explanation of symbols]

(1) Disc (1a) Outer surface (1 ') Disc work (1'a)
Outer peripheral surface (2) Valve drive shaft (3) Support shaft (4) Bulging part (5) Mounting hole (6) Ingot (7) Runway (8) Jig (11) Ingot (12) Runway (B) Part-Time Job

Claims (2)

[Claims] 1. A method of manufacturing a valve body having an elliptical shape and outer peripheral surfaces of both long diameter portions being inclined surfaces, wherein a plurality of valve body workpieces having substantially the same shape as the valve body to be manufactured are provided. After casting ingots that are parallel to each other and are inclined at a predetermined angle and that are continuous with each other with an appropriate runner, after rotating the ingots about the central axis and finishing grinding the outer peripheral surface to a predetermined diameter A method for manufacturing a valve body of a butterfly type valve device, which is characterized in that the valve body is divided into individual valve body works. 2. The method for manufacturing a valve body of a butterfly valve device according to claim 1, wherein the runner is continuously provided at the center of the valve work.