JP2011148048A - Shot peening device and shot peening method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make shot material uniformly collide with all over the inner circumferential surface of a pipe, and recover the shot material after the collision without leaving them in the pipe. <P>SOLUTION: The shot peening device includes: a feed pipe 2 inserted into the pipe 102 from the opening at an end of the pipe 102; at least one jet hole 21 at the distal end of the feed pipe 2, directed outward of the circumference of the feed pipe 2; a rotating means 3 rotating the feed pipe 2 on an axis center R; a moving means 4 moving the feed pipe 2 along the axis center R; a shot material supply means 5 supplying the shot material into the feed pipe 2 and jetting it from the jet hole 21; a transfer means 6 helically provided on the outer circumference of the feed pipe 2 so as to transfer the jetted shot material to the proximal end side of the feed pipe 2, accompanied by the rotation of the feed pipe 2; and a recovery means 7 disposed at the opening portion of the pipe 102 so as to recover the shot material transferred by the transfer means 6. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a shot peening apparatus and a shot peening method.

  Shot peening is a kind of cold working, and shot material, which is a sphere of ferrous or non-ferrous metal, collides with the metal surface at a high speed to generate a compressive stress on the metal surface and to improve fatigue strength against repeated loads. Improve. For example, if tensile residual stress is applied to the pipe by welding or the like, stress corrosion cracking (SCC) may occur on the inner surface of the pipe. To do. Moreover, shot peening is applied to the welded portion in order to improve the fatigue strength of the joint.

  Conventionally, for example, in Patent Document 1, in order to uniformly perform shot peening on the inner surface of a pipe, a feed pipe inserted into the pipe, a nozzle provided on the distal end side of the feed pipe, and a proximal end of the feed pipe A bead feeding means for ejecting beads (shot material) from a nozzle via a feed pipe, a moving means for moving the feed pipe along the axial direction, and a rotating means for rotating the feed pipe in the circumferential direction And a shot peening apparatus including nozzle positioning means for positioning the nozzle so as to be coaxial with the pipe. In this shot peening apparatus, the ejected beads are vacuumed and collected from the collection adapter.

JP 10-71566 A

  By the way, in the existing steam generator in the nuclear power generation facility, the heat transfer tube is expanded to the tube plate at the upper part of the water chamber, and the edge portion is welded. When shot peening is applied to such a pipe expansion part or welded part, a nozzle is arranged upward from the water chamber side of an existing vertical steam generator, and the nozzle is inserted into the heat transfer pipe. On the other hand, in the case of newly installed or replaced steam generators, when shot peening is performed at the production stage in the factory, it is easier to perform the installation including the setup if the heat transfer tube is in the horizontal direction.

  However, if it is an existing vertical steam generator, the conventional shot peening device described above can be used for sufficient construction. The material accumulates on the lower side of the pipe, and it is difficult to collect the shot material by suction. Since the shot material remaining in the heat transfer tube becomes a foreign substance, it must be recovered.

  The present invention solves the above-described problem, and a shot peening apparatus and a shot capable of causing a shot material to uniformly collide with the entire inner periphery of the tube and collecting the shot material after the collision without remaining in the tube. An object is to provide a peening method.

  In order to achieve the above-mentioned object, the shot peening apparatus of the present invention is a shot peening apparatus that applies a compressive stress by causing a shot material to collide with an inner surface of a pipe whose end is welded to a tube plate and disposed laterally. A pipe to be inserted into the pipe from an opening at the end of the pipe, at least one ejection hole facing outward of the circumference of the pipe at the tip of the pipe, and the pipe Rotating means for rotating the shaft around the axis, moving means for moving the feed pipe along the axis, and shot material supply means for feeding the shot material into the feed pipe and ejecting it from the ejection hole. A transfer means for transferring the shot material spirally provided on the outer periphery of the feed pipe to the proximal end side of the feed pipe along with the rotation of the feed pipe; and an opening portion of the pipe. The shot transferred by the transfer means Characterized by comprising a recovery means for recovering the timber, the.

  According to this shot peening apparatus, even if the inner surface of the tube whose end is welded to the tube plate is arranged sideways, the entire circumference of the inner surface of the tube can be obtained by rotating the pipe having the ejection holes around the axis. It is possible to apply a compressive stress by uniformly colliding the shot material. Further, since the feed pipe is rotated around the axis, the shot material is concentrated at one point by using one ejection hole, so that a sufficient compressive stress is applied even if the air pressure to be delivered is lowered. Miniaturization can be achieved. In addition, the shot material that has been ejected is transferred to the proximal end side of the feed pipe as the feed pipe rotates, so that the shot material can be recovered without remaining in the pipe.

  In the shot peening apparatus of the present invention, the ejection hole is provided obliquely toward the tip of the feed pipe with respect to the axis of the feed pipe.

  According to this shot peening apparatus, the shot material collides with the welded portion of the opening of the pipe before inserting the pipe into the pipe. Therefore, when compressive stress is applied to the inner surface of the pipe, the compressive stress is also applied to the welded part. Is given.

  In order to achieve the above-mentioned object, the shot peening method of the present invention is a shot peening method in which a shot material is made to collide with an inner surface arranged laterally of a tube whose end is welded to a tube plate to give a compressive stress. Inserting the tip of the pipe from the opening at the end of the pipe, rotating the pipe around the axis and supplying the shot material into the pipe to the tip of the pipe A step of ejecting the shot material from an ejection hole facing outward of the circumference of the pipe, and rotation of the pipe by a transfer means provided spirally on the outer circumference of the pipe And a step of transferring the shot material transferred by the transfer means to the proximal end side of the pipe.

  According to this shot peening method, even if the inner surface of the tube whose end is welded to the tube plate is disposed sideways, the entire circumference of the inner surface of the tube can be obtained by rotating the pipe having the ejection holes around the axis. It is possible to apply a compressive stress by uniformly colliding the shot material. In addition, the shot material that has been ejected is transferred to the proximal end side of the feed pipe as the feed pipe rotates, so that the shot material can be recovered without remaining in the pipe.

  In the shot peening method of the present invention, the ejection hole is provided obliquely toward the distal end of the feed pipe with respect to the axial center of the feed pipe, and the distal end of the feed pipe extends from the opening of the pipe. Before insertion, the pipe is rotated about its axis, and a shot material is supplied into the pipe and ejected from the ejection hole.

  According to this shot peening method, the shot material collides with the welded portion of the opening of the tube before inserting the pipe into the tube. Therefore, when compressive stress is applied to the inner surface of the tube, the compressive stress is also applied to the welded portion. Is given.

  According to the present invention, the shot material can be uniformly collided with the entire inner circumference of the tube, and the shot material after the collision can be recovered without remaining in the tube.

FIG. 1 is a schematic configuration diagram of a shot peening apparatus according to an embodiment of the present invention. FIG. 2 is a schematic diagram showing the operation of the shot peening apparatus according to the embodiment of the present invention. FIG. 3 is a schematic diagram showing the operation of the shot peening apparatus according to the embodiment of the present invention. FIG. 4 is a schematic diagram showing the operation of the shot peening apparatus according to the embodiment of the present invention.

  Embodiments according to the present invention will be described below in detail with reference to the drawings. Note that the present invention is not limited to the embodiments. In addition, constituent elements in the following embodiments include those that can be easily replaced by those skilled in the art or those that are substantially the same.

  The shot peening apparatus described below is particularly suitable for applying compressive stress to a portion where a pipe has been welded in a nuclear facility by causing the shot material to collide with the inner surface of the pipe and the welded portion. The location is not limited to nuclear facilities.

  As shown in FIG. 1, the shot peening apparatus 1 according to the present embodiment is a pipe whose end is welded to a tube plate 101 in a manufacturing stage at a factory when a steam generator of a nuclear facility is newly installed or replaced ( This is suitable for performing shot peening on the inner surface of the tube 102 and the welded portion 103 in a state where the inner surface of the tube 102 is disposed sideways with the heat transfer tube 102 being placed horizontally. The tube 102 is expanded and fitted into the tube plate 101, and an end portion is welded to the tube plate 101.

  The shot peening apparatus 1 includes a pipe 2, a rotation unit 3, a moving unit 4, a shot material supply unit 5, a transfer unit 6, and a collection unit 7.

  The tube 2 is inserted into the tube 102 through an opening at the end of the tube 102 welded to the tube plate 101. A jet hole 21 through which a shot material is jetted is provided at a distal end portion of the feed pipe 2 inserted into the pipe 102. It is sufficient that at least one ejection hole 21 is provided. Further, the ejection hole 21 is provided so as to open toward the outer periphery of the feed pipe, and preferably provided so as to open obliquely toward the distal end of the feed pipe 2 with respect to the axis of the feed pipe 2. It has been. The pipe 2 may be a hard straight pipe or a soft and bendable pipe.

  Further, the pipe 2 is provided with a seal member 22 at the tip thereof. The seal member 22 is made of rubber, felt, fiber, or the like, contacts the inner surface of the tube 102 in a state where the tube 2 is inserted into the tube 102, and moves the inner side of the tube 102 ahead of the tip of the tube 2. In addition to closing, the tip of the pipe 2 is positioned at the center of the pipe 102. A bearing (not shown) may be provided between the pipe 2 and the seal member 22.

  The rotating means 3 rotates the pipe 2 around the axis R. Although not clearly shown in the figure, the rotating means 3 includes, for example, a motor and a transmission mechanism that transmits the rotation of the motor to the pipe 2.

  The moving means 4 moves the pipe 2 in the direction along the axis R. Although not shown in the drawing, the moving means 4 has a configuration in which, for example, a rail is arranged along the axis R of the pipe 2 and the pipe 2 is slid along with the rotating means 3 along the rail.

  The shot material supply means 5 supplies the shot material to the inside of the feed tube 2 and ejects the shot material to the outside of the tip end portion of the feed tube 2 from the ejection hole 21. Although not clearly shown in the drawing, the shot material supply means 5 includes, for example, a storage portion that stores the shot material, a hopper that supplies a predetermined amount of shot material stored in the storage portion, and a shot material supplied from the hopper. And a sending unit for sending out. Reference numeral 51 denotes a joint that supplies the shot material to the inside of the pipe 2 without hindering the rotation of the pipe 2.

  The transfer means 6 is provided in a spiral shape on the outer periphery of the feed tube 2, and transfers the shot material ejected from the ejection hole 21 to the proximal end side of the feed tube 2 as the feed tube 2 rotates. . The transfer means 6 is preferably formed of fibers or the like.

  The collection means 7 has a chamber 71. The chamber 71 inserts the pipe 2 and surrounds the vicinity of the opening of the pipe 102 including the pipe 2 and through which the pipe 2 is inserted. The chamber 71 is connected via a suction pipe 73 to a suction portion 72 that sucks the shot material in the chamber 71 and the pipe 102 by a vacuum pump (not shown). In FIG. 1, the suction pipe 73 surrounds the outer periphery of the pipe 2 so that a double pipe is configured together with the pipe 2. Thus, by using a double tube, when the shot material is exposed to radiation, it becomes possible to collect the shot material without leaking the radiation. Reference numeral 74 denotes a joint that allows the shot material to pass through the suction pipe 73 without hindering the rotation of the pipe 2. Although not clearly shown in the drawing, the suction pipe 73 may be directly connected from the chamber 71 to the suction unit 72 without forming a double pipe. In this case, the joint 74 is unnecessary.

  Hereinafter, the operation (shot peening method) of the above-described shot peening apparatus 1 will be described.

  First, as shown in FIG. 2, the chamber 71 is disposed in the opening portion of the tube 102 to be shot peened, and surrounds the opening of the tube 102 and the welded portion 103 of the tube 102.

  Next, as shown in FIG. 3, the feed pipe 2 is rotated by the rotating means 3, the shot material S is ejected from the ejection hole 21 by the shot material supply means 5, and the feed pipe 2 is opened by the moving means 4. Move to the vicinity. As a result, the shot material S ejected from the ejection hole 21 collides with the welded portion 103 of the pipe 102 and applies a compressive stress to the welded portion 103. At this time, the ejected shot material S does not reach the inside of the pipe 102 by the seal member 22 but reaches the suction portion 72 from the chamber 71 through the suction pipe 73. When a double pipe is constituted by the feed pipe 2 and the suction pipe 73, the shot material S inside the suction pipe 73 is transferred by the transfer means 6.

  Next, as shown in FIG. 4, the pipe 2 is inserted into the pipe 102 by the moving means 4. As a result, the shot material S ejected from the ejection hole 21 collides with the inner surface of the tube 102 and gives a compressive stress to the tube 102. At this time, the ejected shot material S does not reach the back of the tube 102 by the seal member 22, reaches the chamber 71 outside the tube 102 by the transfer means 6, and reaches the suction unit 72 from the chamber 71 through the suction tube 73. .

  As described above, the shot peening apparatus 1 according to the present embodiment includes the pipe 2 that is inserted into the pipe 102 from the opening at the end of the pipe 102, and the periphery of the pipe 2 at the tip of the pipe 2. At least one ejection hole 21 facing outward, a rotating means 3 for rotating the feed pipe 2 around the axis R, a moving means 4 for moving the feed pipe 2 along the axis R, and a shot material Shot material supply means 5 for supplying the inside of the pipe 2 and ejecting it from the ejection hole 21, and the shot material spirally provided on the outer periphery of the feed pipe 2 and ejected along with the rotation of the feed pipe 2 A transfer means 6 for transferring to the base end side, and a recovery means 7 for recovering the shot material transferred by the transfer means 6 disposed at the opening of the tube 102.

  According to the shot peening apparatus 1, the tube 102 having the end welded to the tube plate 101 is placed horizontally, and the feed tube 2 having the ejection holes 21 is axially centered even when the inner surface of the tube 102 is disposed sideways. By rotating around R, the shot material can uniformly collide with the entire inner surface of the tube 102 to apply a compressive stress. In addition, since the feed pipe 2 is rotated around the axis R, the shot material can be concentrated at one point by using one ejection hole 21, so that a sufficient compressive stress can be applied even if the delivered air pressure is lowered. The material supply means 5 can be downsized. In addition, by transferring the ejected shot material to the proximal end side of the feed pipe 2 with the rotation of the feed pipe 2, the shot means can be recovered without remaining in the pipe 102. It becomes possible.

  Further, the shot peening apparatus 1 according to the present embodiment is provided with the ejection holes 21 obliquely toward the distal end of the feed pipe 2 with respect to the axis R of the feed pipe 2.

  According to this shot peening apparatus 1, since the shot material collides with the welded portion 103 of the opening portion of the tube 102 before inserting the feeding pipe 2 into the tube 102, when compressive stress is applied to the inner surface of the tube 102, It becomes possible to give a compressive stress also to the welding part 103. FIG.

  Moreover, the shot peening apparatus 1 according to the present embodiment is provided with a seal member 22 that closes the tube 102 at the tip of the tube 2.

  According to this shot peening apparatus 1, the seal member 22 can block the back side of the pipe 102 ahead of the tip of the pipe 2, and can prevent the shot material from entering the back side of the pipe 102. become. Moreover, the distal end portion of the pipe 2 can be positioned at the center of the pipe 102 by the seal member 22 and the rotation of the pipe 2 can be supported.

  In the shot peening apparatus 1 according to the present embodiment, a bearing is provided between the pipe 2 and the seal member 22.

  According to the shot peening apparatus 1, it is possible to support the pipe 2 so that the rotation of the pipe 2 is smooth.

  As described above, the shot peening method according to the present embodiment includes the step of inserting the tip of the pipe 2 through the opening at the end of the pipe 102, rotating the pipe 2 around the axis R, and feeding the shot material. Supplying the inside of the pipe 2 and ejecting the shot material from the ejection holes 21 facing the outer periphery of the circumference of the feeding pipe 2 at the tip of the feeding pipe 2, and the ejected shot material on the outer circumference of the feeding pipe 2 It includes a step of transferring to the base end side of the feed tube 2 with the rotation of the feed tube 2 by the transfer unit 6 provided in a spiral shape, and a step of collecting the shot material transferred by the transfer unit 6.

  According to this shot peening method, even if the tube 102 whose end is welded to the tube plate 101 is placed horizontally, the inner surface of the tube 102 is rotated by rotating the feed tube 2 having the ejection holes 21 around the axis R. It is possible to apply a compressive stress by causing the shot material to collide uniformly. In addition, by transferring the ejected shot material to the proximal end side of the feed pipe 2 with the rotation of the feed pipe 2, the shot means can be recovered without remaining in the pipe 102. It becomes possible.

  Further, in the shot peening method of the present embodiment, the ejection hole 21 is provided obliquely toward the distal end of the feed tube 2 with respect to the axis of the feed tube 2, and the distal end of the feed tube 2 is arranged on the tube 102. Before inserting from the opening, the feed tube 2 is rotated around the axis R and the shot material is supplied into the feed tube 2 to be ejected from the ejection hole 21.

  According to this shot peening method, the shot material can be made to collide with the welded portion 103 of the opening portion of the tube 102 before the feeding pipe 2 is inserted into the tube 102, and a compressive stress is applied to the inner surface of the tube 102. The compressive stress can be applied to the welded portion 103 as well.

  As described above, the shot peening apparatus and the shot peening method according to the present invention are suitable for causing the shot material to uniformly collide with the entire inner circumference of the tube and collecting the shot material after the collision without remaining in the tube. ing.

DESCRIPTION OF SYMBOLS 1 Shot peening apparatus 2 Pipe 21 Jet hole 22 Seal member 3 Rotating means 4 Moving means 5 Shot material supply means 51 Joint 6 Transfer means 7 Recovery means 71 Chamber 72 Suction part 73 Suction pipe 74 Joint 101 Tube plate 102 Pipe 103 Welding part R axis center S shot material

Claims (4)

A shot peening apparatus that applies a compressive stress by causing a shot material to collide with an inner surface arranged sideways of a pipe whose end is welded to a tube plate,
A tube that is inserted into the tube through an opening at an end of the tube;
At least one ejection hole facing outward of the circumference of the pipe at the tip of the pipe;
A rotating means for rotating the pipe around the axis;
Moving means for moving the pipe along the axis;
Shot material supply means for supplying the shot material to the inside of the feed pipe and ejecting the shot material from the ejection hole;
A transfer means for transferring the shot material ejected spirally on the outer periphery of the pipe to the proximal end side of the pipe along with the rotation of the pipe;
A recovery means for recovering the shot material transferred by the transfer means arranged at the opening of the tube;
A shot peening apparatus comprising:   2. The shot peening apparatus according to claim 1, wherein the ejection hole is provided obliquely toward the distal end of the feed pipe with respect to the axis of the feed pipe. A shot peening method in which a shot material is made to collide with an inner surface arranged in a lateral direction of a pipe whose end is welded to a tube sheet to give a compressive stress,
Inserting the tip of the tube from the opening at the end of the tube;
The pipe is rotated about its axis and the shot material is supplied to the inside of the pipe to cause the shot material to be ejected from a jet hole directed outward of the circumference of the pipe at the tip of the pipe. Process,
A step of transferring the ejected shot material to a proximal end side of the pipe along with the rotation of the pipe by a transfer means provided spirally on the outer periphery of the pipe; and
Recovering the shot material transferred by the transfer means;
A shot peening method comprising:   The ejection hole is provided obliquely toward the distal end of the feed tube with respect to the axial center of the feed tube, and before the distal end of the feed tube is inserted from the opening of the tube, the feed tube is pivoted. The shot peening method according to claim 3, wherein the shot peening method is configured to rotate around a center and supply a shot material to the inside of the feed pipe to be ejected from the ejection hole.

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