JP6917437B2 - Fixing device, test piece manufacturing device, and test piece manufacturing method - Google Patents

Description

The present invention relates to a fixing device, a test piece manufacturing device, and a test piece manufacturing method.

The low alloy steel used for the reactor vessel is embrittled by irradiation with neutrons during the service period. Inside the reactor vessel, a monitoring test capsule containing a monitoring test piece of the same steel material (that is, low alloy steel) as the reactor vessel is installed. The monitoring test capsule is installed inside the reactor vessel when the plant is newly constructed and is regularly removed from the reactor vessel. By conducting a material test on the monitoring test piece taken out from the reactor vessel, the degree of embrittlement due to neutron irradiation is confirmed, and the soundness of the reactor vessel is evaluated.

The monitoring test capsule contains a fracture toughness test piece, a tensile test piece, a Charpy impact test piece, and the like as monitoring test pieces. There is a limit to the amount of monitoring test capsules that can be placed inside the reactor vessel. Therefore, it is necessary to efficiently use the monitoring test piece taken out from the reactor vessel.

In the evaluation of fracture toughness of a reactor vessel, a method is known in which a master curve showing the relationship between temperature and fracture toughness is created and the fracture toughness is evaluated from the master curve. In order to improve the evaluation accuracy of fracture toughness based on the master curve, it is desirable to expand the fracture toughness data by using a large number of fracture toughness test pieces. However, depending on the plant, the number of fracture toughness test pieces contained in the monitoring test capsule may be small. Therefore, a method has been proposed in which a minute fracture toughness test piece (miniature CT test piece) is produced from the residual material of the Charpy impact test piece after the completion of the Charpy impact test, and the Charpy impact test piece is effectively utilized.

In addition, Patent Document 1 discloses a technique relating to a minute sampling device for collecting a minute test piece from a metal surface.

Japanese Unexamined Patent Publication No. 9-218139

When manufacturing a miniature CT test piece, the residual material is processed with one end of the residual material of the Charpy impact test piece in the longitudinal direction fixed by a fixing device. When considering the fixing stability of the residual material during processing, it is preferable that the dimension of the portion of the residual material held by the fixing device is large. However, if the size of the portion held by the fixing device is large, the number of miniature CT test pieces that can be manufactured from the remaining material is small, which is not preferable from the viewpoint of effective utilization of the Charpy impact test piece. In some cases, it may not be possible to secure the number required for setting the master curve.

Further, the vicinity of the fracture surface of the Charpy impact test piece after the completion of the Charpy impact test is plastically deformed. When a miniature CT test piece is manufactured from a plastically deformed portion, the test result is affected by the test result, and the evaluation accuracy of fracture toughness using the miniature CT test piece may decrease. Therefore, it is not preferable to manufacture a miniature CT test piece from the plastically deformed portion. A technique capable of producing as many miniature CT test pieces as possible is expected even from a Charpy impact test piece having a plastically deformed portion.

An object of the present invention is to provide a test material fixing device, a test piece manufacturing device, and a test piece manufacturing method capable of manufacturing a large number of test pieces from a limited amount of test materials.

A first aspect of the present invention is a device for fixing a test material, which comprises a first member and a second member that sandwiches the test material between the first member. Provided is a fixing device having a support surface in contact with a first region of a first surface of the test material and a recess having an inner surface facing the second region of the first surface via a gap.

According to the first aspect of the present invention, since the test material is sandwiched and fixed between the support surface of the first member and the second member, the fixing stability of the test material during processing is improved. Since a gap is formed between the test material and the recess, a machining tool can be inserted into the gap to machine the part of the test material sandwiched between the first member and the second member. can. As a result, a large number of test pieces can be manufactured from the test material while the fixing stability is maintained.

In the first aspect of the present invention, it is preferable that the wire of the wire electric discharge machine is arranged in the gap between the test material and the recess.

The strength of the first member is maintained by setting the dimensions of the recesses to the dimensions necessary and sufficient for the wires to be arranged. Therefore, the deterioration of the fixing stability of the test material is suppressed. In addition, the test material is processed with high accuracy based on wire electric discharge machining.

In the first aspect of the present invention, it is preferable that the support surfaces are provided on both sides of the recess in a direction orthogonal to the extending direction of the wire.

Since the first surface of the test material is supported by at least two support surfaces of the first member, the fixing stability of the test material is improved. The first surface of the test material is accurately processed by the wire arranged in the recess.

In the first aspect of the present invention, the second member also has a recess forming a gap in which the wire is arranged with the second surface of the test material facing in the opposite direction of the first surface. You may.

By providing the recesses not only in the first member but also in the second member, it is possible to accurately process both the first surface and the second surface with a wire to produce test pieces having various shapes.

In the first aspect of the present invention, the first member faces a part of the first surface of the test material, and the second member faces the opposite direction of the first surface of the test material. It is preferable to face all of the second surface of the above.

Since the second member supports the entire second surface of the test material, the fixing stability of the test material is improved. Since the first member faces a part of the first surface of the test material and does not face the other part, the part of the first surface of the test material that does not face the first member can be smoothly processed. be able to.

In the first aspect of the present invention, it is preferable that the second member has a magnet for fixing the test material to the second member.

If the first member does not face the entire first surface of the test material, the holding force of the test material by the first member and the second member may be insufficient. By providing the second member with a magnet, the holding force can be improved by the magnetic force of the magnet. Therefore, the deterioration of the fixing stability of the test material is suppressed.

In the first aspect of the present invention, it is preferable that the first member and the second member sandwich at least a part of the tab material fixed to the test material.

By fixing the tab material to the test material and sandwiching the tab material between the first member and the second member, the fixing stability of the test material is improved. The first member and the second member can stably fix the test material by sandwiching the tab material without sandwiching the test material. Further, since the tab material is sandwiched between the first member and the second member, the portion of the test material that protrudes outward from the space between the first member and the second member increases, so that the test material can be smoothly used. Can be processed.

A second aspect of the present invention is a device for fixing a test material, in which at least a part of a tab material fixed to the test material is sandwiched between the first member and the first member. Provided is a fixing device including a member.

According to the second aspect of the present invention, the tab material is fixed to the test material, and the tab material is sandwiched between the first member and the second member, so that the fixing stability of the test material is improved. The first member and the second member can stably fix the test material by sandwiching the tab material without sandwiching the test material. Since the tab member is sandwiched between the first member and the second member, the portion of the test material that protrudes outward from the space between the first member and the second member increases, so that the fixed stability is maintained. Therefore, a large number of test pieces can be smoothly manufactured from the test material.

In the second aspect of the present invention, the test material may be fixed to the tab material by a magnet.

The test material and the tab material are firmly fixed by the magnetic force of the magnet.

In the second aspect of the present invention, the suction device may be provided which sucks the test material through the tab material and causes the tab material to adsorb and hold the test material.

The test material and the tab material are firmly fixed by the suction force generated by the suction device.

In the second aspect of the present invention, one of the test material and the tab material may be provided with a groove, and the other of the test material and the tab material may be provided with a slide portion that fits into the groove.

By catching the slide portion in the groove portion, the test material and the tab material are firmly fixed.

A third aspect of the present invention includes a fixing device according to the first or second aspect, and a processing device for processing the test material fixed to the fixing device to produce a test piece. A piece manufacturing apparatus is provided.

According to the third aspect of the present invention, a large number of test pieces can be produced from the test material while maintaining the fixing stability of the test material during processing.

A fourth aspect of the present invention is a first member having a recess having a support surface in contact with the first region of the first surface of the test material and an inner surface facing the second region of the first surface via a gap. The test material is sandwiched between the second member facing the second surface of the test material facing the opposite direction of the first surface, and the gap between the test material and the recess. Provided is a method for manufacturing a test piece, including manufacturing a test piece by wire electric discharge machining of the test material with a wire arranged in the above.

According to the fourth aspect of the present invention, since the test material is sandwiched and fixed between the support surface of the first member and the second member, the fixing stability of the test material during processing is improved. Since a gap is formed between the test material and the recess, a wire is inserted into the gap, and the portion of the test material sandwiched between the first member and the second member is also subjected to wire electric discharge machining. Can be done. As a result, a large number of test pieces can be manufactured from the test material with high processing accuracy while the fixing stability is maintained.

A fifth aspect of the present invention is to fix the test material and the tab material, to sandwich at least a part of the tab material between the first member and the second member, and to sandwich the tab material through the tab material. Provided is a method for producing a test piece, which comprises processing the first member and the test material fixed to the second member to produce a test piece.

According to the fifth aspect of the present invention, the tab material is fixed to the test material, and the tab material is sandwiched between the first member and the second member, so that the fixing stability of the test material is improved. The first member and the second member can stably fix the test material by sandwiching the tab material without sandwiching the test material. Since the tab member is sandwiched between the first member and the second member, the portion of the test material that protrudes outward from the space between the first member and the second member increases, so that the fixed stability is maintained. Therefore, a large number of test pieces can be smoothly manufactured from the test material.

According to the present invention, there is provided a test material fixing device, a test piece manufacturing device, and a test piece manufacturing method capable of manufacturing a large number of test pieces from a limited amount of test materials.

FIG. 1 is a diagram schematically showing an example of a test piece manufacturing apparatus according to the first embodiment. FIG. 2 is a plan view showing an example of the fixing device according to the first embodiment. FIG. 3 is a flowchart showing an example of a method for manufacturing a test piece according to the first embodiment. FIG. 4 is a vertical cross-sectional view showing an example of a reactor vessel containing the monitoring test capsule according to the first embodiment. FIG. 5 is a diagram schematically showing an example of a monitoring test capsule according to the first embodiment. FIG. 6 is a diagram showing a part of the monitoring test capsule according to the first embodiment. FIG. 7 is a diagram showing an example of a Charpy impact test piece. FIG. 8 is a perspective view showing an example of the residual material of the Charpy impact test piece which is the test material. FIG. 9 is a plan view showing an example of the fixing device according to the first embodiment. FIG. 10 is a diagram schematically showing the relationship between the test material and the miniature CT test piece. FIG. 11 is a perspective view showing an example of a miniature CT test piece manufactured by the manufacturing apparatus. FIG. 12 is a diagram showing an example of a master curve used in the evaluation of fracture toughness of a reactor vessel. FIG. 13 is a diagram for explaining a problem of the prior art. FIG. 14 is a diagram for explaining a problem of the prior art. FIG. 15 is a diagram showing a modified example of the fixing device according to the first embodiment. FIG. 16 is a diagram for explaining an example of a method of fixing the test material according to the second embodiment. FIG. 17 is a diagram for explaining an example of a device for fixing the test material according to the second embodiment. FIG. 18 is a diagram for explaining an example of a method of fixing the test material according to the second embodiment. FIG. 19 is a diagram for explaining an example of a device for fixing the test material according to the second embodiment. FIG. 20 is a diagram showing an example of the test material according to the third embodiment. FIG. 21 is a diagram showing an example of the tab material according to the third embodiment. FIG. 22 is a diagram for explaining an example of a method of fixing the test material according to the third embodiment.

Hereinafter, embodiments according to the present invention will be described with reference to the drawings, but the present invention is not limited thereto. The components of the embodiments described below can be combined as appropriate. In addition, some components may not be used.

In the following description, a three-dimensional Cartesian coordinate system is set, and the positional relationship of each part will be described with reference to the three-dimensional Cartesian coordinate system. The direction parallel to the first axis in the horizontal plane is the X-axis direction, the direction parallel to the second axis in the horizontal plane orthogonal to the first axis is the Y-axis direction, and the direction parallel to the third axis orthogonal to the horizontal plane is. The Z-axis direction.

<First Embodiment>
The first embodiment will be described. FIG. 1 is a diagram schematically showing an example of a test piece manufacturing apparatus 100 according to the present embodiment. The manufacturing apparatus 100 includes a fixing device 10 for fixing the test material S, and a processing device 200 for processing the test material S fixed to the fixing device 10 to produce a test piece.

In the present embodiment, the processing apparatus 200 includes a wire electric discharge machine. The processing apparatus 200 is arranged between the wire supply unit 202 including the supply bobbin for supplying the wire 201, the wire collection unit 203 including the collection bobbin for collecting the wire 201, and the wire supply unit 202 and the wire collection unit 203. , Includes support portions 204, 205 for supporting the wire 201. Supports 204, 205 include a rotatable pulley. The wire 201 extends in the Z-axis direction between the support portion 204 and the support portion 205. The test material S is wire electric discharge machined by the wire 201 between the support portion 204 and the support portion 205.

FIG. 2 is a plan view showing an example of the fixing device 10 according to the present embodiment. As shown in FIGS. 1 and 2, the fixing device 10 includes a first member 11, a second member 12 that sandwiches the test material S between the first member 11, and the first member 11 and the second member 12. A support device 13 for supporting the above is provided.

Each of the first member 11 and the second member 12 is a rod-shaped member extending in the X-axis direction. The first member 11 has an facing surface 14 that can face the second member 12. The second member 12 has an facing surface 15 that can face the first member 11. Each of the facing surface 14 and the facing surface 15 is a flat surface substantially parallel to the XZ plane.

The support device 13 supports the base end portion of the first member 11 and the base end portion of the second member 12. The first member 11 and the second member 12 are provided so as to project from the support device 13 in the + X direction. The position of the tip of the first member 11 and the position of the tip of the second member 12 in the X-axis direction are different. In the present embodiment, the tip end portion of the second member 12 is arranged on the + X side of the tip end portion of the first member 11. The dimension L2 of the second member 12 in the X-axis direction is larger than the dimension L1 of the first member 11.

The support device 13 movably supports one or both of the first member 11 and the second member 12 in the Y-axis direction. The support device 13 can adjust one or both of the first member 11 and the second member 12 in the Y-axis direction to adjust the distance between the facing surface 14 and the facing surface 15. One of the first member 11 and the second member 12 so that the distance between the facing surface 14 and the facing surface 15 becomes smaller in a state where the test material S is arranged between the first member 11 and the second member 12. Or both move in the Y-axis direction, so that the test material S is clamped by the first member 11 and the second member 12. Further, the support device 13 has a fixing mechanism for fixing the position of the first member 11 and the position of the second member 12. In a state where the test material S is clamped to the first member 11 and the second member 12, the position of the first member 11 and the position of the second member 12 are fixed by the fixing mechanism, so that the test material S is the first member. It is fixed in a state of being sandwiched between the first member 11 and the second member 12.

The test material S is a substantially rectangular parallelepiped member, and has a first surface S1 that can face the facing surface 14 of the first member 11 and a second surface S2 that can face the facing surface 15 of the second member 12. Has. The second surface S2 is a surface facing the opposite direction of the first surface S1. The first surface S1 is a substantially flat surface and is in contact with the facing surface 14. The second surface S2 is a substantially flat surface and is in contact with the facing surface 15.

The first member 11 has an inner surface that faces the support surface 16 that contacts the first region S1a of the first surface S1 of the test material S and the second region S1b of the first surface S1 of the test material S via a gap. It has a recess 18 having a 17 and a recess 18.

The first region S1a and the second region S1b are each a part of the first surface S1.

The support surface 16 is a part of the facing surface 14 and is flat. The recess 18 is provided in a part of the facing surface 14. The recess 18 is a groove-shaped recess that penetrates the + Z side side surface and the −Z side side surface of the first member 11, and extends in the Z-axis direction. Support surfaces 16 are provided on both sides of the recess 17 in the X-axis direction orthogonal to the Z-axis direction, which is the extending direction of the wire 201.

In the present embodiment, two recesses 18 are provided in the first member 11. The dimension W1 (width) of one recess 18A in the X-axis direction is different from the dimension W2 (width) of the other recess 18B in the X-axis direction. The dimension W1 of one recess 18A provided on the tip end side of the first member 11 is larger than the dimension W2 of the other recess 18B provided on the proximal end side of the first member 11. The dimension D1 (depth) of one recess 18A in the Y-axis direction is equal to the dimension D2 (depth) of one recess 18B in the Y-axis direction. The dimension W1 is larger than the dimension D1. The dimension W2 is larger than the dimension D2.

As described above, the dimension L2 of the second member 12 is larger than the dimension L1 of the first member 11. The first member 11 faces a part of the first surface S1 of the test material S and does not face the other part. The second member 2 faces the entire second surface S2 of the test material S.

The second member 12 has a magnet 20 for fixing the test material S to the second member 12. When the test material S is made of a metal such as low carbon steel, the test material S is held on the facing surface 15 of the second member 12 by the magnetic force generated by the magnet 20.

In the present embodiment, the wire 201 of the processing apparatus 200 is arranged in the gap between the test material S and the recess 18 of the first member 11. The wire 201 performs wire electric discharge machining on the first surface S1 of the test material S.

Next, a method of manufacturing a test piece using the manufacturing apparatus 100 according to the present embodiment will be described. In the present embodiment, a method of manufacturing a miniature CT test piece from the residual material of the Charpy impact test piece contained in the monitoring test capsule taken out from the reactor vessel will be described.

FIG. 3 is a flowchart showing an example of a method for manufacturing a test piece according to the present embodiment. As shown in FIG. 3, the test piece manufacturing method includes a step of taking out the monitoring test capsule from the reactor vessel (step SP1) and a step of taking out the Charpy impact test piece from the monitoring test capsule and performing a test (step SP2). , A step of sandwiching and fixing the test material S made of the residual material of the Charpy impact test piece after the completion of the Charpy impact test between the first member 11 and the second member 12 (step SP3), and the test material S and the first This includes a step (step SP4) of manufacturing a miniature CT test piece by wire electric discharge machining of the test material S with a wire 201 arranged in a gap between the member 11 and the recess 18.

FIG. 4 is a vertical cross-sectional view showing an example of the reactor vessel 300 containing the monitoring test capsule 1 according to the present embodiment. The reactor vessel 300 stores the fuel assembly 301. The reactor vessel 300 is made of low alloy steel. The reactor vessel 300 includes a reactor vessel body 300A and a reactor vessel lid 300B. By removing the reactor vessel lid 300B, the reactor internal structure including the fuel assembly 301 can be inserted into the reactor vessel main body 300A. Further, the reactor vessel 300 is provided with a control rod driving device 305 for driving the control rods.

The core tank 302 is arranged inside the reactor vessel main body 300A. A core 304 including a plurality of fuel assemblies 301 is arranged in the core tank 302. The core tank 302 has a cylindrical shape and is arranged so that a gap is formed between the core tank 302 and the inner wall surface of the reactor vessel main body 300A.

A storage container 303 for accommodating the monitoring test capsule 1 is arranged between the core tank 302 and the reactor container main body 300A. A plurality of storage containers 303 are provided around the core tank 302 at intervals. The monitoring test capsule 1 housed in the storage container 303 is arranged radially outside the core 304.

The low alloy steel used in the reactor vessel 300 is embrittled by irradiation with neutrons from the core 304. The monitoring test capsule 1 is taken out from the reactor vessel 300 in order to confirm the degree of embrittlement of the reactor vessel 300 due to neutron irradiation (step SP1).

The monitoring test capsule 1 taken out from the reactor vessel 300 is transported to a hot cell and then handled by a remotely controlled manipulator.

FIG. 5 is a diagram schematically showing an example of the monitoring test capsule 1 according to the present embodiment. FIG. 6 is a diagram showing a part of the monitoring test capsule 1 according to the present embodiment, and corresponds to the part A of FIG.

The monitoring test capsule 1 contains the monitoring test piece 2. The monitoring test piece 2 is made of the same steel material (that is, low alloy steel) as the reactor vessel 300. The monitoring test capsule 1 has a holding member 3, a stay member 4, a capsule container 5, and a tip member 6.

The holding member 3 is a member held by a manipulator in handling the monitoring test capsule 1. The stay member 4 is a member that adjusts the length of the monitoring test capsule 1. A plurality of capsule containers 5 are arranged in the longitudinal direction of the monitoring test capsule 1. A plurality of monitoring test pieces 2 are housed inside the capsule container 5. The tip member 6 guides the insertion of the monitoring test capsule 1 into the storage container 303.

As shown in FIG. 6, the monitoring test capsule 1 contains a fracture toughness test piece 7, a tensile test piece 8, and a Charpy impact test piece 9 as the monitoring test piece 2. The monitoring test piece 2 housed in the monitoring test capsule 1 is not limited to the fracture toughness test piece 7, the tensile test piece 8, and the Charpy impact test piece 9.

The monitoring test piece 2 is taken out from the monitoring test capsule 1 by a remotely controlled manipulator (step SP2). Monitoring test A material test is carried out on the monitoring test piece 2 taken out from the capsule 1 to evaluate the soundness of the reactor vessel 300. As described above, in the reactor vessel 300, the monitoring test capsule 1 is arranged radially inside the reactor vessel body 300A. Therefore, the irradiation amount of neutrons irradiated to the monitoring test piece 2 is larger than the irradiation amount of neutrons irradiated to the reactor vessel body 300A. Therefore, by carrying out the material test for the monitoring test piece 2, it is possible to perform advance monitoring for changes in the material properties due to neutron irradiation of the reactor vessel 300.

FIG. 7 is a diagram showing an example of a Charpy impact test piece 9 taken out from the reactor vessel 300 and taken out from the monitoring test capsule 1. The Charpy impact test piece 9 is a substantially rectangular parallelepiped member, and its external dimensions are standardized. The dimension E in the longitudinal direction is about 55 [mm], and the dimension F in the lateral direction is about 10 [mm]. By performing the Charpy impact test on the Charpy impact test piece 9, the Charpy impact test piece 9 is divided into two residual materials 9D and 9D with the notch portion 9N as a boundary.

FIG. 8 is a perspective view showing an example of the residual material 9D of the Charpy impact test piece 9 after the completion of the Charpy impact test. The residual material 9D generated by the fracture of the Charpy impact test piece 9 with the notch portion 9N as a boundary has a fracture surface 9S.

A miniature CT test piece 50 is manufactured from the residual material 9D of the Charpy impact test piece 9. According to the Charpy impact test, a part of the residual material 9D near the fracture surface 9S is plastically deformed. If the miniature CT test piece 50 is manufactured from the plastically deformed portion of the residual material 9D, the evaluation accuracy of the fracture toughness using the miniature CT test piece 50 may decrease. Therefore, the miniature CT test piece 50 is manufactured from the portion of the residual material 9D that is unlikely to be plastically deformed. The dimension G in the longitudinal direction of the portion of the residual material 9D that is unlikely to be plastically deformed and can be used is about 24 [mm].

Next, the residual material 9D of the Charpy impact test piece 9, which is the test material S, is fixed to the fixing device 10 (step SP3). FIG. 9 is a diagram schematically showing a state in which the residual material 9D is fixed to the fixing device 10. The residual material 9D is fixed by being sandwiched between the first member 11 and the second member 12. In the following description, the residual material 9D is appropriately referred to as a test material S.

Next, the wire 201 is arranged in the gap between the test material S (residual material 9D) and the recess 18 of the first member 11. The processing apparatus 200 manufactures a miniature CT test piece 50 by wire electric discharge machining of the test material S with a wire 201 (step SP4).

In FIG. 9, the dotted line shows the outer shape of the miniature CT test piece 50 scheduled to be processed. The miniature CT test piece 50 has a recess 51 formed on the first surface S1, a groove 52 formed to connect to the recess 51, and a hole 53 penetrating in the Z-axis direction. The manufacturing apparatus 100 relatively moves the test material S fixed to the fixing device 10 and the wire 201 so that the wire 201 moves along the outer shape (scheduled machining line) of the miniature CT test piece 50 shown by the dotted line. ..

In the test material S, two miniature CT test pieces 50 are manufactured in the X-axis direction. A miniature CT test piece 50A is manufactured from a portion of the test material S near the tip end portion of the second member 12, and a miniature CT test piece 50B is manufactured from a portion close to the base end portion of the second member 12.

That is, in the present embodiment, the miniature CT test piece 50B is manufactured from the portion of the test material S sandwiched between the first member 11 and the second member 12. The miniature CT test piece 50A is manufactured from a portion of the test material S that is not sandwiched between the first member 11 and the second member 12 but is supported by the second member 12.

When forming the recess 51 and the groove 52 of the miniature CT test piece 50B, as shown in FIG. 9, the first surface S1 of the test material S and the first member 11 of the two recesses 18 of the first member 11 The wire 201 is arranged in the gap between the recess 18A and the recess 18A near the tip. After the wire 201 is arranged in the gap between the first surface S1 and the recess 18A, the wire 201 is fixed to the fixing device 10 so as to move along the scheduled machining line of the recess 51 and the groove 52 shown by the dotted line. By the relative movement of the test material S and the wire 201, the recess 51 and the groove 52 of the miniature CT test piece 50B are formed.

The dimension W1 of the recess 18 in the X-axis direction is larger than the dimension of the recess 51 in the X-axis direction. The end of the opening of the recess 51 in the X-axis direction is arranged inside the recess 18. Therefore, the test material S is smoothly processed by the wire 201 without processing the first member 11.

Further, when the end face on the −X side of the test material S is cut to form the end face on the −X side of the miniature CT test piece 50B, the base of the first member 11 out of the two recesses 18 of the first member 11. The wire 201 is arranged in the gap between the recess 18B and the recess 18B near the end. After the wire 201 is arranged in the gap between the first surface S1 and the recess 18B, the fixing device is moved so that the wire 201 moves along the scheduled machining line on the −X side end surface of the miniature CT test piece 50B indicated by the dotted line. By the relative movement of the test material S fixed to 10 and the wire 201, the end face on the −X side of the miniature CT test piece 50B is formed.

Since the recess 18 is provided in the first member 11 in this way, the miniature CT test piece 50B can be manufactured from the portion of the test material S sandwiched between the first member 11 and the second member 12. can.

When the recess 51 and the groove 52 of the miniature CT test piece 50A are formed, the first surface S1 of the portion of the test material S on which the miniature CT test piece 50A is formed does not face the first member 11. After the wire 201 and the first surface S1 of the portion where the miniature CT test piece 50A is formed are brought into contact with each other, the wire 201 moves along the scheduled machining line of the recess 51 and the groove 52 of the miniature CT test piece 50A shown by the dotted line. As a result, the test material S fixed to the fixing device 10 and the wire 201 are relatively moved so that the recess 51 and the groove 52 of the miniature CT test piece 50A are smoothly formed. Further, the end face on the + X side of the test material S is cut by the wire 201 to form the end face on the + X side of the miniature CT test piece 50A.

Further, the portion of the test material S on which the miniature CT test piece 50A is formed and the portion on which the miniature CT test piece 50B is formed are cut by the wire 201, so that the portion of the miniature CT test piece 50A on the −X side is cut. Each of the end face and the end face on the + X side of the miniature CT test piece 50B is formed.

Although the portion of the test material S on which the miniature CT test piece 50A is formed is not sandwiched between the first member 11 and the second member 12, the test material S is fixed to the second member 12 by the magnet 20. Therefore, the miniature CT test piece 50A can be smoothly manufactured.

In the present embodiment, the pilot hole 53P is formed in the test material S by drilling before fixing the test material S to the fixing device 10. When the hole 53 is formed by wire electric discharge machining, the wire 201 is arranged in the pilot hole 53P of the test material S fixed to the fixing device 50. After the wire 201 is arranged in the pilot hole 53P, the test material S fixed to the fixing device 10 so that the wire 201 moves along the scheduled machining line of the hole 53 of the miniature CT test piece 50 shown by the dotted line. By relatively moving the wire 201 and the wire 201, the hole 53 of the miniature CT test piece 50 is formed.

In the present embodiment, the manufacturing apparatus 100 can perform wire electric discharge machining on the test material S fixed to the fixing device 10 without carrying out the work of changing the holding of the test material S by the fixing device 10.

FIG. 10 is a diagram schematically showing the relationship between the test material S and the miniature CT test piece 50. As shown in FIG. 10, in the present embodiment, four miniature CT test pieces 50 are manufactured from the test material S (residual material 9D). In the test material S, two miniature CT test pieces 50 are manufactured in the X-axis direction, and two miniature CT test pieces 50 are manufactured in the Y-axis direction. In the description with reference to FIG. 9, a case where two miniature CT test pieces 50 arranged in the X-axis direction are manufactured has been described. The manufacturing apparatus 100 changes the positional relationship between the wire 201 and the test material S by causing the fixing device 10 to change the test material S from the fixed state of the test material S by the fixing device 10 shown in FIG. Thereby, two miniature CT test pieces 50 can be manufactured in the Y-axis direction by wire electric discharge machining.

FIG. 11 is a perspective view showing an example of a miniature CT test piece 50 manufactured by the manufacturing apparatus 100. As shown in FIG. 11, the miniature CT test piece 50 has a recess 51, a groove 52, and a hole 53. The miniature CT test piece 50 is a substantially rectangular parallelepiped member. The external dimensions of the miniature CT test piece 50 are standardized. The height dimension H of the miniature CT test piece 50 is about 10 [mm], the width dimension P is about 10 [mm], and the depth dimension Q is about 4 [mm].

A fracture toughness test is performed using a plurality of manufactured miniature CT test pieces 50. The fracture toughness of the reactor vessel 300 is evaluated using the results of the fracture toughness test.

FIG. 12 is a diagram showing an example of a master curve used in the evaluation of the fracture toughness of the reactor vessel 300. As shown in FIG. 12, the master curve shows the relationship between temperature and fracture toughness. A master curve is created from the test results of the fracture toughness test performed using each of the plurality of miniature CT test pieces 50. In order to improve the evaluation accuracy of fracture toughness based on the master curve, it is preferable to obtain a large number of fracture toughness test pieces and expand the fracture toughness data. According to this embodiment, four miniature CT test pieces 50 can be manufactured from the residual material 9D which is the test material S. Therefore, a large number of miniature CT test pieces 50 used for the fracture toughness test can be produced from the residual material 9D whose number or amount is limited, and the fracture toughness data can be expanded.

As described above, according to the present embodiment, the test material S is sandwiched and fixed between the support surface 16 of the first member 11 and the second member 12, so that the test material S during processing Fixed stability is improved. Since a gap is formed between the test material S and the recess 18 of the first member 11, the wire 201 is inserted into the gap, and the first member 11 and the second member 12 of the test material S are inserted. The part sandwiched between the wires can also be processed. As a result, a large number (4) of miniature CT test pieces 50 can be manufactured from the test material S while the fixing stability is maintained.

13 and 14 are diagrams for explaining problems in the prior art. In FIGS. 13 and 14, the first member 11J and the second member 12J are not provided with the recess 18. As shown in FIG. 13, when the miniature CT test piece 50 is manufactured from the residual material 9D of the Charpy impact test piece 9 after the completion of the Charpy impact test, the remaining material 9D is sandwiched between the first member 11J and the second member 12J. The length of the portion to be processed is required to be about 5 [mm] in consideration of the fixing stability of the residual material 9D during processing.

As described with reference to FIG. 8, the dimension G in the longitudinal direction of the portion of the residual material 9D that is unlikely to be plastically deformed and can be used is about 24 [mm]. Further, the dimension F of the residual material 9D in the lateral direction is 10 [mm]. Further, as described with reference to FIG. 12, the external dimensions of the miniature CT test piece 50 are standardized, the dimension H of the miniature CT test piece 50 is about 10 [mm], and the dimension P is about 10. It is [mm], and the dimension Q is about 4 [mm]. Therefore, four miniature CT test pieces 50 can be manufactured from the remaining material 9D.

However, as shown in FIG. 14, when trying to manufacture four miniature CT test pieces 50 from the residual material 9D, in the prior art, the portion of the residual material 9D sandwiched between the first member 11J and the second member 12J. It is necessary to make the length of the lumber shorter than 5 [mm]. In that case, it becomes difficult to secure the fixing stability of the residual material 9D during processing.

According to the present embodiment, the length of the portion of the residual material 9D sandwiched between the first member 11 and the second member 12 is set to about 5 [mm] or more, and the first member 11 and the second member 12 are combined with each other. A miniature CT test piece 50 can be manufactured from the portion sandwiched between the two. Therefore, four miniature CT test pieces 50 can be manufactured from the portion of the residual material 9D that is unlikely to be plastically deformed and can be used while ensuring the fixing stability of the residual material 9D during processing. ..

Further, in general, the wire electric discharge machine has a function of automatically inserting the wire 201 into the hole and a function of automatically connecting the wire 201 cut during processing. In addition, the wire electric discharge machine can automatically process the shape of a miniature CT test piece by numerical control by programming. Therefore, by providing a recess 18 in the first member 11 and providing a gap (hole) between the first member 11 and the test material S, the function of the wire electric discharge machine is utilized and the wire 201 is inserted in the gap. By inserting the miniature CT test piece 50, wire electric discharge machining can be performed efficiently and with high machining accuracy.

Further, according to the present embodiment, the support surfaces 16 are provided on both sides of the recess 18 in the X-axis direction. Therefore, the first surface S1 of the test material S is supported by at least two support surfaces 16 of the first member 11. Therefore, the fixing stability of the test material S is improved, and the first surface S1 of the test material S is accurately processed by the wire 201 arranged in the recess 18.

Further, in the present embodiment, unlike the dimension L1 of the first member 11 and the dimension L2 of the second member 12, the first member 11 faces a part of the first surface S1 of the test material S, and is the first member. The 2 member 12 faces the entire second surface S2 of the test material S. When the second member 12 supports the entire second surface S2 of the test material S, the fixing stability of the test material S is improved. Since the first member 11 faces a part of the first surface S1 of the test material S and does not face the other part, the portion of the first surface S1 of the test material S that does not face the first member 11 Processing, that is, processing of the miniature CT test piece 50A can be smoothly performed. For example, the miniature CT test piece 50A may be machined by a machining method such as cutting, instead of wire electric discharge machining.

Further, in the present embodiment, the second member 12 has a magnet 20 for fixing the test material S to the second member 12. If the first member 11 does not face all of the first surfaces S1 of the test material S, the holding force of the test material S by the first member 11 and the second member 12 may be insufficient. By providing the magnet 20 on the second member 12 as the fixing auxiliary means, the holding force can be improved by the magnetic force of the magnet 20. Therefore, a decrease in the fixing stability of the test material S is suppressed.

In this embodiment, the magnet 20 may be omitted. Even without the magnet 20, four miniature CT test pieces 50 can be manufactured by processing the test material S so that the miniature CT test piece 50B is manufactured after the miniature CT test piece 50A is manufactured. can.

In this embodiment, the recess 18 is provided in the first member 11. As shown in FIG. 15, the second member 12 may also have a recess 18 that forms a gap in which the wire 201 is arranged with the second surface S2 of the test material S.

By providing the recess 18 not only in the first member 11 but also in the second member 12, both the first surface S1 and the second surface S2 of the test material S can be accurately processed by the wire 201 to have various shapes. Test pieces can be manufactured. Further, when the miniature CT test piece 50 is manufactured, the miniature CT test piece 50 can be manufactured by passing the wire 201 through either the recess 18 of the first member 11 or the recess 18 of the second member 12.

As shown in FIG. 15, the dimensions of the first member 11 and the dimensions of the second member 12 in the X-axis direction may be equal to each other. Not only the part where the miniature CT test piece 50B is manufactured, but also the part where the miniature CT test piece 50A is manufactured is provided with the recess 18, so that the test is sandwiched between the first member 11 and the second member 12. A miniature CT test piece 50A and a miniature CT test piece 50B can be manufactured from the material S by wire electric discharge machining.

In this embodiment, the recess 18 may be provided on at least one of the first surface S1 and the second surface S2 of the test material S. Before the wire electric discharge machining is performed, the test material S is provided with a recess 18 in advance, and the test material S provided with the recess 18 is sandwiched between the first member 11 and the second member 12, and then the test material S is provided. The sample material S may be wire electric discharge machined.

<Second Embodiment>
The second embodiment will be described. In the following description, the same or equivalent components as those in the above-described embodiment are designated by the same reference numerals, and the description thereof will be simplified or omitted.

16 and 17 are diagrams schematically showing an example of a fixing method and fixing device 10B of the test material S according to the present embodiment. In the present embodiment, the first member 11 and the second member 12 of the fixing device 10B sandwich at least a part of the tab member 30 fixed to the test material S. The tab member 30 is an additional member fixed to the end portion of the test material S on the −X side. The tab material 30 functions as an extension member for extending the length of the test material S, and by being fixed to the tab material S, the length of the test material S is substantially increased. In the YZ plane, the outer shape (shape and dimensions) of the test material S and the outer shape (shape and dimensions) of the tab material 30 are equal. In the present embodiment, the YZ plane is a plane orthogonal to the axes of the test material S and the tab material 30 extending in the X-axis direction.

Although the first member 11 and the second member 12 do not have the recess 18 in the present embodiment, they may have the recess 18 as in the above-described embodiment.

The tab material 30 has a magnet 31. When the test material S is made of a magnetic metal such as low alloy steel, the test material S is fixed to the tab material 30 by the magnetic force of the magnet 31.

In the present embodiment, as shown in FIG. 16, the tab material 30 and the test material S are mounted on the surface plate 32, and the tab material 30 and the test material S are kept parallel to each other. The fixing work of 30 and the test material S is carried out. After the tab material 30 and the test material S are fixed by the magnetic force of the magnet 31, the first member 11 and the second member 12 of the fixing device 10B sandwich the tab material 30 as shown in FIG. In the example shown in FIG. 17, the entire tab material 30 and a part of the test material S are sandwiched between the first member 11 and the second member 12. The tab material 30 may be sandwiched between the first member 11 and the second member, and the test material S may not be sandwiched. The first member 11 and the second member 12 do not have to sandwich the entire tab member 30, or may sandwich a part of the tab member 30.

With the tab member 30 sandwiched between the first member 11 and the second member 12, the portion of the test material S that protrudes outward from the space between the first member 11 and the second member 12 is processed. Then, a plurality of miniature CT test pieces 50 are manufactured. The processing apparatus 200 including the wire electric discharge machine manufactures a miniature CT test piece 50 by wire electric discharge machining of the test material S fixed to the first member 11 and the second member 12 via the tab material 30. In the present embodiment, the test material S may be machined by wire electric discharge machining or by a machining method such as cutting.

As described above, according to the present embodiment, by fixing the test material S and the tab material 30, the first member 11 and the second member 12 do not have to sandwich the test material S. By sandwiching the tab material 30, the test material S can be stably fixed. Since the tab member 30 is sandwiched between the first member 11 and the second member 12, the portion of the test material S that protrudes outward from the space between the first member 11 and the second member 12 increases, so that the tab member 30 is fixed and stable. A large number of miniature CT test pieces 50 can be smoothly manufactured from the test material S while maintaining the properties.

Further, in the present embodiment, the test material S and the tab material 30 are fixed by the magnetic force of the magnet 31 provided on the tab material 30. As a result, the test material S and the tab material 30 are firmly fixed.

As a method of fixing the test material S and the tab material 31, a fixing method by welding or a fixing method by an adhesive may be adopted. On the other hand, in the fixing method by welding, the material properties of the test material S may change due to heat input. Further, in the fixing method using an adhesive, the electrical conduction between the test material S and the tab material 30 may be cut off. Further, when wire electric discharge machining is adopted as the processing method of the test material S, it is considered that the adhesive force is lowered by the processing liquid in the fixing method using an adhesive. Therefore, it is preferable to adopt a fixing method using a magnetic force as in the present embodiment.

As a fixing method of the test material S and the tab material 30, a fixing method using suction by negative pressure may be adopted. 18 and 19 are views showing an example of a fixing method and a fixing device 10C using suction by negative pressure. As shown in FIGS. 18 and 19, the tab member 30C is a tubular member and has an internal space 33. The + X side end of the tab material 30C is connected to the test material S via a sealing material 34 such as an O-ring. The −X side end of the tab member 30C is connected to the connector 36 via a sealing material 35 such as an O-ring. The connector 36 is a tubular member and has an internal space 37 connected to the internal space 33 of the tab member 30C.

As shown in FIG. 18, the tab material 30C and the test material S are mounted on the surface plate 32, and the internal space 33 of the tab material 30C is provided in a state where the parallelism between the tab material 30C and the test material S is ensured. It is made negative pressure. The internal space 37 of the connector 36 is connected to a suction device 38 such as a vacuum pump. When the suction device 38 operates, the pressures in the internal space 37 and the internal space 33 decrease, and the test material S is sucked and held by the tab material 30C. As a result, the tab material 30C and the test material S are fixed.

Next, as shown in FIG. 19, the tab member 30C fixed to the test material S is sandwiched between the first member 11 and the second member 12 of the fixing device 10C. The fixing device 10C includes a suction device 39 that sucks the test material S through the tab material 30C and causes the tab material 30C to suck and hold the test material S. The suction device 39 includes a vacuum pump and is connected to the internal space 37 of the connector 36. When the suction device 39 is activated, the pressures in the internal space 37 and the internal space 33 are reduced, and the test material S is sucked and held by the tab material 30C.

The internal space 37 and the internal space 33 are made negative pressure by the suction device 39, and the tab member 30C is sandwiched between the first member 11 and the second member 12, and the first member 11 and the first member S of the test material S are in a state of being sandwiched between the first member 11 and the second member 12. A portion protruding outward from the space between the two members 12 is processed to manufacture a plurality of miniature CT test pieces 50. The test material S may be machined by wire electric discharge machining, or may be machined by a machining method such as cutting.

<Third Embodiment>
The third embodiment will be described. 20, FIG. 21, and FIG. 22 are diagrams showing an example of the test material S and the tab material 30D according to the present embodiment.

In the present embodiment, as shown in FIG. 20, a groove 41 is provided in the test material S. The groove portion 41 is formed at the end portion of the test material S on the −X side so as to penetrate the side surface on the + Y side and the side surface on the −Y side of the test material S. The inner surface of the groove portion 41 includes an facing surface 41A capable of facing the slide portion 42 and an engaging surface 41B. The angle θ formed by the facing surface 41A and the engaging surface 41B is smaller than 90 [°]. The groove 41 can be formed by, for example, wire electric discharge machining.

As shown in FIG. 21, a slide portion 42 is provided on the tab member 30D. The slide portion 42 is provided so as to fit into the groove portion 41 of the test material S. The slide portion 42 has a facing surface 42A that can contact the facing surface 41A of the groove portion 41 and an engaging surface 42B that can contact the engaging surface 41B of the groove portion 41. The slide portion 42 can be formed by, for example, wire electric discharge machining.

The slide portion 42 is inserted into the groove portion 41 through the opening on the −Y side or the + Y side of the groove portion 41. The slide portion 42 is arranged in the groove portion 41 by relatively moving (sliding) the slide portion 42 and the groove portion 41 in the Y-axis direction. The test material S and the tab material 30D are fixed by the engaging surface 41B and the engaging surface 42B coming into contact with each other and the slide portion 42 being hooked on the groove portion 41.

After the slide portion 42 is arranged in the groove portion 41, the fixing plate 30D is applied to the −Y side side surface of the test material S and the −Y side side surface of the tab material 30D as shown in FIG. Similarly, the fixing plate 30D is applied to the + Y side surface of the test material S and the + Y side surface of the tab material 30D. The fixed plate 30D is applied to a part of the test material S so that four miniature CT test pieces 50 are produced from the test material S. The fixing plate 30D is fixed to the tab member 30D by a fastening member 44 such as a bolt or a screw. As a result, the relative movement of the slide portion 42 and the groove portion 41 in the Y-axis direction is restricted, and the test material S and the tab material 30D are fixed.

After the test material S and the tab material 30D are fixed, the tab material 30D is sandwiched between the first member 11 and the second member 12 as in the above-described embodiment. A plurality of miniature CT test pieces 50 are manufactured by processing the test material D fixed to the first member 11 and the second member 12 via the tab material 30D.

As described above, also in the present embodiment, the test material S and the tab material 30D are firmly fixed, and a large number of miniature CT test pieces 50 can be manufactured from the test material S.

In the present embodiment, the groove portion 41 may be formed in the tab material 30D, and the slide portion 42 may be formed in the test material S.

In addition, for example, by cooling and fitting the groove portion 41 and the slide portion 42, the test material S and the tab material 30D can be fixed even if the fixing plate 44 is omitted.

In each of the above-described embodiments, the test material S is the residual material 9D of the Charpy impact test piece 9, and the test piece manufactured from the test material S is the miniature CT test piece 50. The test material S may be, for example, the residual material of the tensile test piece 8, or the test piece to be manufactured may not be the miniature CT test piece 50. The techniques described in each of the above embodiments are widely applicable in the field of producing test pieces from test materials.

1 Monitoring test capsule 2 Monitoring test piece 3 Holding member 4 Stay member 5 Capsule container 6 Tip member 7 Breaking toughness test piece 8 Tensile test piece 9 Charpy impact test piece 9D Remaining material 9N Notch 9S Fracture surface 10 Fixing device 11 First member 12 Second member 13 Support device 14 Facing surface 15 Facing surface 16 Support surface 17 Inner surface 18 Recess 20 Magnet 30 Tab material 30C Tab material 30D Tab material 31 Magnet 32 Plate 33 Internal space 34 Seal material 35 Seal material 36 Connector 37 Internal space 38 Suction device 39 Suction device 41 Groove 41A Facing surface 41B Engaging surface 42 Sliding part 42A Facing surface 42B Engaging surface 43 Fixing plate 44 Fastening member 50 Miniature CT test piece 51 Recess 52 Groove 53 Hole 53P Pilot hole 100 Manufacturing device 200 Processing equipment 201 Wire 202 Wire supply unit 203 Wire recovery unit 204, 205 Support unit 300 Reactor vessel 300A Reactor vessel body 300B Reactor vessel lid 301 Fuel assembly 302 Core tank 303 Containment vessel 304 Core 305 Control rod drive device S Sample material S1 1st surface S1a 1st area S1b 2nd area S2 2nd surface

Claims (7)

It is a fixing device for the test material,
A first member and a second member that sandwiches at least a part of the tab material fixed to the test material between the first member and the first member are provided .
The test piece is fixed devices that will be fixed to the tub member by the magnet. It is a fixing device for the test material,
A first member and a second member that sandwiches at least a part of the tab material fixed to the test material between the first member and the first member are provided.
The tab material has a cylindrical shape and has a cylindrical shape.
Fixed device that includes a suction device for attracting and holding the test piece in the tub member by sucking the sample material through the tab member. It is a fixing device for the test material,
A first member and a second member that sandwiches at least a part of the tab material fixed to the test material between the first member and the first member are provided.
A groove is provided on one of the test material and the tab material.
The test material and the other on the circle slide portion fixed device that is provided with fit in the groove of the tub material. The fixing device according to any one of claims 1 to 3,
A test piece manufacturing device including a processing device for manufacturing a test piece by processing the test material fixed to the fixing device. Fixing the test material and the tab material,
At least a part of the tab material is sandwiched between the first member and the second member, and
See contains and a possible to manufacture the processed test piece a fixed the test specimen in the first member and the second member via the tab member,
The test material is a method for manufacturing a test piece fixed to the tab material by a magnet. Fixing the test material and the tab material,
At least a part of the tab material is sandwiched between the first member and the second member, and
Includes processing the test material fixed to the first member and the second member via the tab material to produce a test piece.
The tab material has a cylindrical shape and has a cylindrical shape.
A method for producing a test piece in which the test material is sucked through the tab material and the test material is adsorbed and held on the tab material. Fixing the test material and the tab material,
At least a part of the tab material is sandwiched between the first member and the second member, and
Includes processing the test material fixed to the first member and the second member via the tab material to produce a test piece.
A groove is provided on one of the test material and the tab material.
A method for manufacturing a test piece in which a slide portion fitted in the groove portion is provided on the other side of the test material and the tab material.

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