JPH0942468A - Manufacturing method of regulating valve, manufacturing device and regulating valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve roundness and parallelism of a seat ring and a valve main body and improve performance of a cutting-off property of the regulating valve, etc., by finish-cutting the seat ring after installing the seat ring on a seat ring installation part of the valve main body. SOLUTION: A seat ring 2 held on a click 14 is screwed on a seat ring installation part 1A of a valve main body 1 by moving a screwing tool 10 to the left on an axial line of a main spindle 7 while rotating the valve main body 1 clamped on the main spindle 7 with the main spindle 7 at the time of assembling the seat ring 2. Thereafter, as regards finish machining, the seat ring 2 installed on the valve main body 1 is finished by a machining means while rotating the main spindle 7 as the valve main body 1 is left clamped on the main spindle 7. Consequently, it is possible to improve roundness and parallelism of the seat ring 2 and the valve main body 1 and to heighten performance of a cutting-off property of a regulating valve, etc.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention adjusts the opening of a fluid passage by moving a plug close to and away from a seat ring attached to a seat ring attachment portion in a fluid passage in a valve body. The present invention relates to a possible control valve manufacturing method, a manufacturing apparatus, and a control valve.

[0002]

2. Description of the Related Art As a control valve for controlling the flow rate and pressure of various fluids, there is a control valve in which a seal ring is mounted as a maintenance part and is separately mounted from a valve body. Figure 6
FIG. 7 is a sectional view of such a control valve, and FIG. 7 is an enlarged view of a portion A in FIG.

In these drawings, reference numeral 1 denotes a valve body, and a thin-walled cylindrical seat ring 2 is detachably screwed to a seat ring mounting portion 1A thereof. The seat ring mounting portion 1A includes left and right flow path opening portions 1B and 1C.
Is formed in the fluid flow path between the flow path opening 1 and
Left and right outer flange portions 1D and 1E are provided on the outer circumferences of B and 1C. A plug 3 as a valve body is located above the seat ring 2, and the plug 3 is connected to a control valve controller (not shown) through the upper opening 1F. The distance between the plug 3 and the seat portion 2A of the seat ring 2, that is, the opening of the fluid passage can be adjusted according to the vertical movement position of the plug 3. The upper opening 1F is sealed so as to allow only the vertical movement of the valve shaft as a connecting member between the plug 3 and the regulating valve controller.

FIG. 8 is a flow chart for explaining the manufacturing process of a conventional control valve.
The outer flange portions 1D and 1E are processed and formed by the first and second flange processing steps (steps S1 and S2) on the processing line, and then the seat ring mounting portion 1A is turned by the central turning step (step S3). Step for tapping holes for stud bolts (Step S
After 4), enter the assembly line. On the other hand, for the seat ring 2, first, a stepwise turning process of turning 1 and turning 2 on a processing line different from the valve body 1 (steps S11 and S1).
After 2), finish turning including lapping is performed (step S13), and then the assembly line is entered.
In the assembly line, a stud bolt assembly process (step S21) is performed on the valve body 1, and then a seat ring 2 assembly process (step S22) is performed.

FIG. 9 is a cross-sectional view for explaining the assembling work of the seat ring 2. In the drawing, 4 is a stud bolt and 1G is a hole for the stud bolt. When assembling the seat ring 2, a seat wrench 5 of a dedicated tool is used, and by rotating the seat wrench 5 with a torque wrench 6, the seat ring 2 is screwed to the seat ring mounting portion 1A with a specified torque. The seat wrench 5 has a structure in which the valve body 1 receives a reaction force of the tightening torque of the seat ring 2 via the stud bolt 4.

By the way, in the leak test for measuring the leak when the fluid passage is completely closed by the plug 3, the smaller the leak amount is, the better the blocking property is.
Classified according to S standard. In order to secure the cutoff property, the circularity of the seat ring 2 and
The axis O1 of the valve body 1 and the axis O of the seat ring 2
The concentricity of the valve body 1 and the parallelism between the reference plane F1 of the valve body 1 and the reference plane F2 of the seat ring 2 are required to be highly accurate.

[0007]

Since the conventional method for manufacturing a control valve is constructed as described above, since the thin cylindrical seat ring 2 is processed separately from the valve body 1,
For example, when turning the seat ring 2 with a lathe, the seat ring is chucked and turned.
If you remove the chucking, the seat ring will be distorted, so it was difficult to process it with high roundness. Further, in the leak test after the seat ring 2 is attached to the valve body 1, when the required specifications are not met,
Improve performance by wrapping work. However, this wrapping work involves repeated disassembly, wrapping material application, wrapping, reassembly, and leak testing, so that there is the problem that the experience and intuition of the operator and a great deal of time are required to carry out the wrapping work.

Further, since the processed seat ring 2 is mounted on the valve body 1, the mounting accuracy of the seat ring 2 is immediately O.
It affects the concentricity of 1, O2 and the parallelism of the reference planes F1, F2. However, due to the deviation of the mounting position of the seat ring 2 due to the screw tolerance of the screwed portion of the seat ring 2 and the inclination of the seat ring 2, and the distortion of the seat ring 2 that may occur when the torque wrench 6 is tightened, It was difficult to meet the required concentricity and parallelism because the mounting accuracy deteriorated.

Further, when the valve body 1 is machined by a lathe, the valve body 1 is clamped on the lathe so that the diameter side or the central portion of the valve body 1 is sandwiched.
Therefore, a large face plate is required, high-speed processing cannot be expected, and the clamping force tends to weaken as the rotation speed increases. In addition, when the diameter side of the valve body 1 is clamped, there is a problem that the discharge property of chips is extremely deteriorated.

According to the first aspect of the invention, the control valve is excellent in the processing accuracy of the seat ring, and the circularity and parallelism between the seat ring and the valve body are enhanced without being affected by the mounting accuracy of the seat ring. It is an object of the present invention to obtain a method for manufacturing a control valve capable of enhancing the performance such as the shutoff property of the above.

It is another object of the present invention to provide a method of manufacturing a control valve which is turned with a good chip discharging property and which has a good workability in attaching a seat ring and finishing turning.

It is an object of the present invention to provide a control valve manufacturing apparatus which is excellent in discharge of chips during turning of the valve body and has good workability in seat ring mounting and finish turning. .

It is an object of the invention of claim 4 to obtain a control valve capable of enhancing the roundness and parallelism between the seat ring and the valve body to enhance the performance such as the shutoff property.

[0014]

According to a first aspect of the present invention, there is provided a method of manufacturing a control valve, which comprises mounting a seat ring on a seat ring mounting portion of a valve body and then finishing grinding the seat ring.

According to a second aspect of the present invention, there is provided a method for manufacturing a control valve, wherein before the seat ring is attached to the seat ring attachment portion of the valve body, between the facing surfaces of the left and right outer flange portions provided on the valve body. The valve body is held on the double-opening jig by opening the left and right claws of the double-opening jig, and then the seat ring attachment portion is turned while rotating the double-opening jig together with the valve main body. From the above, the seat ring is screwed to the seat ring mounting portion while rotating the double opening jig together with the valve body, and then the seat ring is finish-turned while rotating the double opening jig together with the valve body. is there.

A control valve manufacturing apparatus according to a third aspect of the present invention has left and right claw portions that can be opened left and right, and the left and right claw portions are opposed to the left and right outer flange portions provided on the valve body. A double-opening jig that can hold the valve body by opening between the surfaces, a rotation driving unit that rotates the double-opening jig, and a seat mounting portion of the valve body that is rotated together with the double-opening jig can be turned. Turning means and screwing means capable of screwing the seat ring onto the seat mounting portion by pressing the seat ring against the seat mounting portion of the valve body rotated together with the double opening jig, and the double opening jig. And a finishing turning means capable of finishing turning the seat ring attached to a seat ring mounting portion of the valve body rotated together with the valve body.

In a control valve according to a fourth aspect of the present invention, the seat ring is constructed by screwing the seat ring to the seat ring mounting portion and then finishing grinding.

[0018]

The method of manufacturing the control valve according to the first aspect of the invention is
After the seat ring is mounted on the seat ring mounting portion, the seat ring is subjected to finish grinding, so that the seat ring is excellent in processing accuracy, and the seat ring and the valve body are not affected by the seat ring mounting accuracy. It improves roundness and parallelism, and improves performance such as shutoff of the control valve.

In the method of manufacturing a control valve according to the second aspect of the present invention, the valve body is held by opening the left and right claw portions of the double-opening jig between the facing surfaces of the left and right outer flange portions of the valve body. The valve body is turned with good chip discharge, and the workability of seat ring mounting and finishing turning is improved.

In the control valve manufacturing apparatus according to the third aspect of the present invention, the valve main body is held by opening the left and right claw portions of the double-opening jig between the facing surfaces of the left and right outer flange portions of the valve main body. Since the valve body is configured to perform turning of the seat mounting portion, screwing of the seat ring, and finishing turning of the seat ring, it excels in chip discharge during turning of the valve body Workability of ring mounting and finish turning is improved.

In the control valve according to the invention of claim 4, as the seat ring, there is provided a seat ring which is mounted on the seat ring mounting portion of the valve body and then subjected to finish grinding, so that the roundness between the seat ring and the valve body is improved. The parallelism is increased, and the performance such as barrier property is improved.

[0022]

【Example】

Embodiment 1 FIG. An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a flow chart for explaining working steps of the method for manufacturing a control valve according to the present embodiment, and FIG.
FIG. 3 is a cross-sectional view of a screw-in tool used during the working process of FIG. 1, and FIG. 3 is a side view for explaining the usage status of the screw-in tool. Corresponding parts are designated by the same reference numerals, and description thereof will be omitted.

In the flow chart of the manufacturing process shown in FIG. 1, the valve body 1 is centered after the outer flange portions 1D and 1E are processed and formed by the first and second flange processing steps (steps S1 and S2) in the processing line. In the turning step (step S3), the seat ring attachment portion 1A is turned by a turning means (not shown), and then the step of assembling the seat ring 2 (step S22) is started. On the other hand, the seat ring 2 is assembled to the valve body 1 in the machining line in step S22 after the lathe 1 in the machining line and the step-wise lathe turning process (steps S11 and S12). After that, the seat ring 2 assembled to the valve body 1 is subjected to finish turning including lapping (step S13), and the valve body 1 is tapped with a hole 1G for a stud bolt (step S4). Enter the assembly line and insert stud bolt 4 into hole 1G.
Are assembled (step S21).

In the step of assembling the seat ring 2 to the valve body 1 (step S22), the screwing tool 10 as a screwing means as shown in FIG. 2 is used. In this screw-in tool 10, a holder 12 is connected to a shaft portion 11 having the same specifications as a drill holder of an NC lathe so that the holder 12 can expand and contract in the left-right direction in FIG. 2, and the shaft portion 11 and the holder 12 are prevented from rotating. The shaft portion 11 is provided with a spring 13 for urging the holder 12 to the left in FIG. 2, and a pawl 14 capable of holding the seat ring 2 is replaceably attached to the tip of the holder 12. . Further, the holder 12 is provided with a clutch 15 so that the transmission of the rotational force between the shaft portion 11 side and the claw 14 side can be interrupted.

Step S in the processing line of the valve body 1
In S22, S13 and S4, the valve body 1 is clamped to the main shaft 7 of the NC lathe as the rotation driving means by the double opening jig 20 as shown in FIG. FIG. 3 shows a state where the valve body 1 having a cross section as shown in FIG. 1 is held by the double-opening jig 20. In FIG. 3, the double-opening jig 20 has a configuration in which a face plate 21 on the spindle 7 side of an NC lathe is provided with left and right claw portions 22 and 23. The claw portions 22 and 23 are located between the left and right outer flange portions 1D and 1E of the valve body 1 and are opened in a direction in which the valve body 1 is separated from each other by N.
It is designed to be clamped on the main shaft 7 of a C-lathe. In the case of this example, the claw portions 22 and 23 move by the same distance in the direction of approaching or separating from each other around the axis of the main shaft 7 according to the direction of relative rotation between the main shaft 7 and the face plate 21, and When the 7 are rotationally driven, they move in directions away from each other to increase the clamping force of the valve body 1. And when the valve body 1 is clamped,
The axis O1 (see FIG. 6) and the axis of the main shaft 7 coincide with each other. Further, a torque sensor 8 is provided on the spindle 7 side of the NC lathe.

Assembly of the seat ring 2 (step S2
2) In that case, the valve body 1 clamped to the main shaft 7
3 is rotated together with the main shaft 7, the screwing tool 10 is moved to the left in FIG. 3 on the axis of the main shaft 7, and the seat ring 2 held by the claw 14 is screwed to the seat ring mounting portion 1A of the valve body 1. . The screwing torque is detected by the torque sensor 8, and when it reaches the specified torque, the rotation of the main shaft 7 is stopped and the clutch 1
In order to turn off 5, the rotation stop signal and the clutch release signal are output, and the attachment of the seat ring 2 is completed.

In the subsequent final turning (step S13), the seat ring 2 attached to the valve body 1 is not shown while rotating the spindle 7 while the valve body 1 is clamped on the spindle 7 as shown in FIG. Finish processing by turning means. At that time, since the seat ring 2 is attached to the valve body 1 and its form is restricted,
The seat ring 2 is not distorted, and high roundness can be obtained. Moreover, since the seat ring 2 is finished by using the valve body 1 as a reference, the concentricity of the shaft cores O1 and O2 and the reference plane F regardless of the mounting accuracy of the seat ring 2 to the valve body 1.
The parallelism of 1 and F2 can be increased, and the performance such as the shutoff property of the control valve is also improved.

In the processing line of the valve body 1, the valve body 1 is NC by the double-opening jig 20.
Since the left and right flow path openings 1B, 1C of the valve body 1 are opened by being clamped by the main shaft 7 of the lathe, cutting chips are unlikely to remain on the screw portion or the plug seat portion of the seat ring mounting portion 1A, Its dischargeability is good. Therefore, it is possible to solve the problem of cutting chips in automating the processing work. For example, central turning (step S3), seat ring assembly (step S22), and finish turning (step S13) can be continuously performed without stopping the machine.

Example 2. FIG. 4 is a side view for explaining a usage state of the screwing tool 10 according to another embodiment of the present invention. The screwing tool 10 of this example has a torque sensor (not shown) built in its holder 12,
The torque sensor detects the screwing torque of the seat ring 2, and when the torque reaches a specified torque, a rotation stop signal of the main shaft 7 and a clutch release signal of the clutch 15 are output.

Example 3. FIG. 5 is a side view for explaining a usage state of the screwing tool 10 according to still another embodiment of the present invention. The screwing tool 10 of this example is
The holder 12 has a hexagonal cross section, and after the spindle 7 and the screwing tool 10 are coaxially positioned, the holder 12 is manually rotated once or twice while the spindle 7 is stopped to move the seat ring 2 After being lightly screwed, the seat ring 2 is screwed by applying a specified torque to the holder 12 with the torque wrench 9.

[0031]

As described above, according to the invention of claim 1, since the seat ring is finished and ground after the seat ring is attached to the seat ring attaching portion, the seat ring is excellent in processing accuracy, and (EN) A control valve manufacturing method capable of improving the roundness and parallelism between a seat ring and a valve body to improve performance such as shutoff property of the control valve without being affected by seat ring mounting accuracy. There is an effect that can be.

According to the second aspect of the invention, the valve body is held by opening the left and right claw portions of the double-opening jig between the facing surfaces of the left and right outer flange portions of the valve body. There is an effect that it is possible to obtain a manufacturing method of a control valve which has good workability in turning of the valve body, seat ring attachment and finish turning.

According to the third aspect of the present invention, the valve body is held by opening the left and right claw portions of the opening jig between the facing surfaces of the left and right outer flange portions of the valve body, and the valve body is held against the valve body. Since the seat mounting part is turned, the seat ring is screwed, and the seat ring is finished ground, it excels in chip discharge during turning of the valve body, and the seat ring mounting and There is an effect that it is possible to obtain a control valve manufacturing apparatus having good workability in finish turning.

According to the fourth aspect of the present invention, the seat ring is configured so that it is mounted on the seat ring mounting portion of the valve body and then finish-ground, so that the roundness between the seat ring and the valve body is round. And increase the parallelism,
There is an effect that it is possible to obtain a control valve that can improve performance such as shutoff property.

[Brief description of drawings]

FIG. 1 is a flow chart for explaining a manufacturing process of a control valve according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a screwing tool used in the seat ring assembling process of FIG.

FIG. 3 is a side view for explaining a usage state of the screwing tool in FIG.

FIG. 4 is a side view for explaining a usage state of a screwing tool according to another embodiment of the present invention.

FIG. 5 is a side view for explaining a usage state of a screwing tool according to still another embodiment of the present invention.

FIG. 6 is a sectional view of a conventional control valve.

FIG. 7 is an enlarged view of a portion A in FIG. 6;

FIG. 8 is a flow chart for explaining a manufacturing process of a conventional control valve.

9 is a cross-sectional view for explaining a usage state of a seat spanner used in the seat ring assembling process of FIG. 8. FIG.

[Explanation of symbols]

 1 Valve body 1A Seat ring mounting part 1D, 1E Outer flange part 2 Seat ring 3 Plug 10 Screwing tool (screwing means) 20 Double opening jig 22, 23 Claw part

Claims (4)

[Claims] 1. A manufacturing method of a control valve in which an opening of a fluid passage can be adjusted by moving a plug close to and away from a seat ring attached to a seat ring attachment portion in a fluid passage in a valve body. A method for manufacturing a control valve according to the method, wherein after the seat ring is attached to a seat ring attachment portion of the valve body, the seat ring is finish ground. 2. Before the seat ring is attached to the seat ring attachment portion of the valve body, the left and right claw portions of the double opening jig are opened between the facing surfaces of the left and right outer flange portions provided on the valve body. Hold the valve main body on the double-opening jig, and then rotate the double-opening jig together with the valve main body while turning the seat ring attachment part, and then rotate the double-opening jig together with the valve main body. The seat ring is screwed to the seat ring attachment portion while being made to rotate, and then the seat ring is finish-turned while rotating the double opening jig together with the valve body. Production method. 3. A manufacturing method of a control valve in which the degree of opening of the fluid passage can be adjusted by moving a plug close to and away from a seat ring attached to a seat ring attachment portion in a fluid passage in a valve body. The device has left and right claw portions that can be opened left and right, and the valve body can be held by opening the left and right claw portions between opposed surfaces of left and right outer flange portions provided on the valve body. Double-opening jig, rotation driving means for rotating the double-opening jig, turning means capable of turning the seat mounting portion of the valve body which is rotated together with the double-opening jig, and the valve which is rotated together with the double-opening jig By pressing the seat ring against the seat mounting portion of the main body, the seat ring is rotated together with the screwing means capable of screwing the seat ring onto the seat mounting portion and the double-opening jig. And a finishing turning means capable of finishing turning the seat ring attached to the seat ring mounting portion of the valve body. 4. A control valve in which the opening of the fluid passage can be adjusted by moving a plug closer to and away from a seat ring attached to a seat ring attachment portion in a fluid passage in a valve body, The control valve, wherein the seat ring is screwed to the seat ring mounting portion and then ground.