JP2531517Y2 - Shot peening equipment - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shot peening apparatus for a weld bead of a pipe welded through a hemispherical or semi-elliptical spherical end plate constituting a pressure vessel such as a nuclear reactor vessel.

[0002]

2. Description of the Related Art For example, a pressure vessel such as a nuclear reactor vessel has a structure as shown in FIG. 4, and in manufacturing, a pipe 02 is passed through a hemispherical end plate 01. Welding is performed on the inner side of the end plate 01 of the pipe 02.
The welding bead 2 is attached to the end plate 01 and the pipe 02 by welding.
4 is formed, but the reliability and durability of the weld bead 24 are indispensable due to the use in the pressure vessel.
The quality of the welded portion can be greatly improved by controlling welding conditions and the like. On the other hand, measures to prevent stress corrosion cracking caused by residual stress due to welding are also desired from the viewpoint of further quality compensation.

As a method of removing residual stress, a shot peening method is more effective than before. However, in a pressure vessel or the like having a structure shown in FIG. 4, there is a problem that work is difficult to perform and shot peening is difficult to perform. is there. That is,
When the pipe 02 is penetrated and welded away from the axis of the end plate 01, the end plate 01 around the pipe 02 is inclined with respect to the pipe 02, and the center side of the end plate 01 around the pipe 02 becomes a wide bead and the opposite side becomes The result is a narrow bead. Also, when performing peening, since the pipe 02 becomes an obstacle,
It is necessary to perform the shot particle spraying nozzle while rotating around the pipe 02 and while changing the height and angle of the nozzle. Further, it is necessary to consider the prevention and collection of shot particles.

The present invention has been made in view of the above problems, and has as its object to provide a shot peening apparatus in which shot peening can be effectively performed and workability is good.

[0005]

Means for Solving the Problems The present invention for attaining the above object is as follows: (1) The surface of a weld bead between a hemispherical or semielliptical spherical end plate and a pipe penetrating in a direction parallel to the center axis of the end plate. In a device for shot peening, a rotating shaft that rotates coaxially and axially movably with the piping using the piping as a guide is provided with a nozzle that rotates integrally therewith, and a housing that rotatably supports the rotating shaft is provided. A template that can be adjusted to an inclination angle corresponding to an attachment angle between the end plate and the pipe, and a scanning roller that moves along the inclination of the template is attached to the rotating shaft so as to rotate integrally therewith, (2) A housing for rotatably supporting the rotating shaft includes a collection tray, bellows for guiding shot particles to the collection tray, and a bellows between the bellows and the end plate. Has a sealing member for preventing scattering of the shot particles, the pressing rod for pressing the sealing material on the bellows to the end plate, characterized in that the support in the housing.

[0006]

When a penetrating pipe is welded to a hemispherical head plate, the nozzle can be moved along the inclination of the inner surface of the head plate around this pipe, and shot particles can be blown out according to the shape of the weld bead. Further, the prevention and collection of the shot particles that have blown out can also be achieved by the structure of the tray, the bellows, and the sealing material.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will now be described with reference to FIGS. In FIG. 1, reference numeral 01 denotes a head plate, and 02 denotes a pipe penetrating the head plate 01. The pipe 02 is provided with a rotating shaft 04 via a guide pin 03 so as to be coaxial, and is integrally formed with a housing 09 for supporting the rotating shaft 04 rotatably and movably in the axial direction. The tray 17 is supported by the support 22.

[0008] The guide pin 03 inserted into the pipe 02
The guide pin 03 is fitted to the pipe 02 such that the flange of the guide pin 03 comes into contact with the end face of the pipe 02, and the tip of the rotating shaft 04 is inserted into the lower end. Guide pin 03 flange and rotating shaft 04
The compression spring 05 is interposed between the tip of the
The guide pin 03 is connected to the pipe 02
I always try to push it inside. Also, the compression spring 05
A seal material 06 is present around the inner periphery of the guide pin 03 to prevent the shot particles 20 from entering the sliding portion between the guide pin 03 and the rotating shaft 04.

The rotating shaft 04 into which the guide pin 03 is slidably inserted at the tip is hollow, and a hose 08 for supplying the shot particles 20 passes through the inside thereof.
Is led out of the hole at the tip of the rotating shaft 04. A nozzle 07 having a shape that allows the shot particles 20 to be blown out is connected to the tip of the hose 08. Also,
A gear 13 to which rotation is transmitted from a motor 15 is fixed to the rotating shaft 04.
The copying roller 16 pressed to 0 is fixed.

The housing 09 supporting the rotating shaft 04 includes:
A hollow disk-shaped template 10 is attached by a pin so as to be tiltable, and the tilt of the template 10 can be freely changed outside the housing 09 without touching the housing 09. The template 10 is fixed by the tilt angle adjuster 11 connected to the support 22. The tilt angle adjuster 11 is a combination of bolts and nuts or a small electric slide. The tilt of the template 10 is adjusted by adjusting the length of the tilt angle adjuster 11, and the tilt of the template 10 is fixed by fixing the position. You. This template 1
Since the copying roller 16 is brought into contact with 0 by the pressing force of the compression spring 12, the rotating shaft 04 fixed to the copying roller 16 moves in the axial direction along the inclination of the template 10 with its rotation.

A housing 09 supported by the support 22
Is provided with a cover 25 to prevent the shot particles 20 from entering the sliding portion between the rotating shaft 04 and the housing 09, and a tray 17 for the shot particles 20 is provided on the outer periphery thereof. The hole for mounting the collection hose 21 is machined. A lower end of an elastic bellows 18 made of leather or rubber material, which covers a part of the rotating shaft 04 and the pipe 02, is attached to the receiving tray 17. A disk 26 formed by processing a steel plate into a ring shape is fixed to the upper end of the bellows 18. Further, on the disk 26, there is provided a sealing material 19 processed into an elastic ring shape with a rubber material or a sponge material. The sealing material 19 is formed so as to be in contact with the inner surface of the end plate 01. Bellows 18, disc 26, sealing material 19
Is supported by a pressing rod 23 provided on the outer periphery of the tray 17 so as to be adjustable, and presses the sealing material 19 against the inner surface of the end plate 01. In this case, the tip of the pressing rod 23 is fixed to the disk 26. Note that the pressing rod 23 may be replaced with an air cylinder.

The supporting member 22 includes a tray 17, a housing 0
9, which supports the rotating shaft 04 and the nozzle 07.
It supports a compression spring 12 for pushing to zero, and a tilt angle adjuster 11, respectively, and also supports a motor 15 for rotating a gear 14 meshing with a gear 13 mounted on a rotating shaft 04. The gear 13 and the gear 14 mesh with each other so that the gear 1 and the gear 14 are not disengaged by the axial movement of the rotating shaft 04.
I made 3 long.

In the above configuration, when performing the shot peening, the support 22 is placed near the pipe 02, the guide pin 03 is inserted into the pipe 02, and the compression spring 05 and the sealing material 06 are arranged and rotated. The shaft 04 is inserted into the guide pin 03, and the sealing member 19 located around the pipe 02 is pressed against the inner surface of the end plate 01 by the pressing rod 23. As a result, the pipe 02 including the weld bead 24 is covered with the sealing material 19, the bellows 18, and the tray 17. On the other hand, the template 10 is inclined so as to have an inclination of θ / 2 with respect to the inclination θ of the end plate 01, and is fixed by the inclination angle adjuster 11.

After such preparation, the motor 5 is driven to rotate the rotating shaft 04, and at the same time, air pressure is supplied to the hose 08 to cause the shot grains 20 to collide against the welding bead 24 to perform shot peening. At this time, the nozzle 07 is fixed to the rotating shaft 04 toward the welding bead 24. In addition, since the mounting position of the copying roller and the nozzle 07 are oriented in the same direction, the nozzle 07 rotates similarly to the movement of the copying roller 16 and moves in the axial direction along the inclination of the template 1. In this way, the nozzle 07 moves along the inclined welding bead 24 while blowing out the shot particles 20. Here, if the rotation speed and the air pressure for feeding the shot particles 20 are set to 4 to 8 divisions around the circumference, uniform stress removal can be performed with almost all changes in the bead shape.

FIGS. 2 and 3 show that the same welded portion of the head plate 01 is shot peened from both the far side (steep inclination) (FIG. 2) and the near side (FIG. 3) from the axis. This is a comparison of the cases. In the shot peening state shown in FIG. 2, the weld bead width is narrow, and the shot particles 20 coming out of the nozzle 07 collide with the weld bead 24 so as to sufficiently cover the bead width. FIG. 3 shows a case where when the nozzle 07 rotates by 180 degrees, the rotating shaft 04 moves upward by the copying roller 16 and the nozzle 07 rises from the state of FIG. For this reason, the positional change between the head plate 01 and the nozzle 07 is relatively small. The shot particles 20 are the sealing material 1
The shot grains 20 can be collected without being scattered by the bellows 9 and the bellows 18.

[0016]

As described above, according to the present invention, shot peening can be automated, man-hours can be reduced, workability can be improved, and the quality of a nuclear container can be improved.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of an embodiment apparatus.

FIG. 2 is an explanatory diagram of a certain processing state.

FIG. 3 is an explanatory diagram of another processing state.

FIG. 4 is a configuration diagram of an example of a workpiece.

[Explanation of symbols]

 Reference Signs List 01 end plate 02 piping 03 guide pin 04 rotation axis 05 compression spring 06 sealing material 07 nozzle 08 hose 09 housing 10 template 11 inclination angle adjusting tool 12 compression spring 13 gear 14 gear 15 motor 16 copying roller 17 receiving plate 18 bellows 19 sealing material 20 shot Particles 21 Collection hose 22 Supporting tool 23 Pressing rod 24 Weld bead 25 Cover 26 Disk

Claims (2)

(57) [Scope of request for utility model registration] 1. An apparatus for shot peening the surface of a weld bead between a hemispherical or semi-elliptical head plate and a pipe penetrating in a direction parallel to the center axis of the head plate, wherein the pipe is used as a guide and coaxial with the pipe. A rotary shaft that rotates so that it can move in the axial direction, and a nozzle that rotates integrally with the rotary shaft. A housing that rotatably supports the rotary shaft can be adjusted to a tilt angle corresponding to the mounting angle between the end plate and the pipe. A shot peening apparatus comprising: a template; and a copying roller that moves along the inclination of the template and is attached to the rotating shaft so as to rotate integrally with the rotating shaft. 2. A housing for rotatably supporting a rotating shaft includes a collecting tray, a bellows for guiding shot particles to the collecting tray, and a seal member between the bellows and the end plate for preventing the shot particles from scattering. 2. The shot peening apparatus according to claim 1, wherein a pressing rod for pressing the sealing material on the bellows against the end plate is supported by the housing.