JPH10267808A - Press device for manufacturing sample for metallographical test - Google Patents

Abstract

PROBLEM TO BE SOLVED: To discharge a heating pressurized gas generating in a chamber into the outside air so as to shorten manufacturing time and reduce error rate, when a metallic body is filled with a resin through hot press processing of organic resin made of thermoplastic grain and powder. SOLUTION: A metallic body 6 is placed upright on a piston 8 which can be moved freely vertically in a chamber 3 of a hot press 1, and a thermoplastic powder organic resin 7 made of thermoplastic grain and powder is put into it from the upside and an upper end opening 3a is covered with an upper lid 4. When the metallic body 6 is subject to press working by heating it by means of a heater 2 and pressing up the piston 8, a heating pressurized gas remaining in the chamber 3 is discharged into the outside air through a gas outlet port 9 provided in the upper lid 4, so that no influence is given to solidification of a heating melted liquid of the resin 7 and any defective product due to crack of resin, jumping out of the metallic body 6, etc., is hardly generated, resulting in improved production efficiency.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a fuel cladding tube constituting a PWR fuel assembly or the like, for example, which is one of various tests as to whether or not trouble-free combustion is performed when the cladding tube is adopted in a nuclear reactor. A corrosion test is performed on a metal body such as a fuel cladding tube, and the thickness of an oxide film formed on the metal body is measured by a metal phase test. The present invention relates to a press machine for producing a sample for a metal phase test, which is obtained by embedding a metal body in a thermoplastic granular organic resin by a press method in order to confirm the state of penetration of a member.

[0002]

2. Description of the Related Art As is well known, when a target measurement is to be performed on a metal body using a fuel cladding tube or the like described above, a metal phase test cannot be performed as it is. By embedding in a predetermined thermoplastic or granular organic resin by a resin method, a gold phase test sample that can be subjected to a gold phase test is formed. Then, the metal phase test sample obtained by polishing the edge surface of the buried metal body and then observing the polished surface with a metal microscope to achieve the measurement purpose of the metal phase test. I have to.

[0003] That is, in preparing a conventional metal phase test sample, a hot press machine a as shown in FIG. 5 is used. First, a required metal such as a tubular metal is placed on a piston c fitted in a chamber b. A metal body d such as a tube is placed upright, and a granular or powdery thermoplastic granular organic resin f made of bakelite, diallyl start, plastic, or the like is charged and deposited from an upper end opening e of the chamber b. . Next, after sealing the upper end opening e with the upper lid g,
By energizing the heater h and pushing up the piston c, pressure is applied for a predetermined time at a constant temperature, whereby the thermoplastic granular organic resin f is solidified to form the gold phase test sample S. In the same figure, S1 denotes an outer resin portion solidified on the outer periphery of the tubular metal tube d, S2 denotes an inner resin portion solidified in the tubular metal tube d,
The metal phase test sample S thus obtained is rubbed and polished on the metal structure observation surface using a polisher, and is inspected and confirmed by a metal microscope or the like.

However, when a sample S for a metal phase test is formed by the above-mentioned conventional hot press machine a, 10% or more of defective products which cannot be rubbed or polished as described above are produced, and the defective products are produced. As an embodiment, as shown in FIGS. 6A to 6E, the outer resin portion S
In example 1 there are cracks Sa, blisters Sb, and metal bodies d jumping out, and there are also resin blowings Sd and cracks Se.

[0005]

SUMMARY OF THE INVENTION As described above, the present invention focuses on the reason why such a high defect rate is caused when forming a sample for a metal phase test using a hot press machine a. The gas remaining in the chamber b before the operation of the press machine a is heated and pressurized after the operation, and the heated and pressurized gas enters the thermoplastic granular organic resin f to be solidified. It was possible to experimentally determine that this was caused by adversely affecting the formation of the homogeneous outer resin portion S1 and inner resin portion S2.

According to the present invention, based on the above-described idea, as a result of the examination, when the press apparatus for producing a sample for a metal phase test according to claim 1 is used, the heated pressurized gas in the chamber is placed in an appropriate place of a hot press machine. By forming an escape opening for the gas that is released to the piston, the push-up operation by the piston can be accelerated to shorten the working time, and there is no occurrence of defective products due to the heated pressurized gas, The aim is to make it possible to improve the yield.

[0007] According to a second aspect of the present invention, the gas release passage of the first aspect is provided with an upper lid, an upper peripheral wall of a chamber,
By providing each between the upper lid and the chamber, the object of claim 1 is surely achieved.

Further, in the manufacturing press apparatus according to the third aspect, not only the gas release port is opened as in the above-mentioned claim 1, but also the heated molten liquid of the thermoplastic granular organic resin is supplied to the gas release port. By providing a shut-off valve for preventing intrusion and overflow to the outside air, in addition to the first aspect, it is possible to prevent occurrence of danger and promote improvement in yield. According to a fourth aspect of the present invention, the object of the third aspect can be reliably achieved by providing the gas release port and the closing valve in the third aspect in the upper lid or the upper peripheral wall of the chamber.

[0009]

In order to achieve the above object, according to the present invention, there is provided a hot chamber comprising a heatable chamber and an upper lid having a freely openable upper end opening. The press body and the above-mentioned chamber are internally fitted so as to be able to move up and down, and a metal body is placed upright,
A piston capable of charging and depositing a thermoplastic particulate organic resin in the chamber, wherein the hot press body includes a heated pressurized gas in the chamber when the piston is raised. The present invention is intended to provide a press machine for producing a sample for a metal phase test, characterized in that a gas release port is formed so that the gas can be released to the outside air.

According to a second aspect of the present invention, when the piston is moved up in the first aspect, the gas release port which allows the heated and pressurized gas in the chamber to be released to the outside air is provided in the upper cover or the hot press body. The content is that it is formed between the upper peripheral wall or upper lid of the chamber and the peripheral edge of the upper opening of the chamber.

According to a third aspect of the present invention, there is provided a hot press body comprising a heatable chamber, an upper lid capable of closing an upper end opening of the chamber, and a metal body which is fitted in the chamber so as to be movable up and down and stands up. And a piston capable of loading and depositing a thermoplastic granular organic resin in the chamber in the hot press machine. A gas release port that allows the heated pressurized gas inside to be released to the outside air is formed, and the gas release port is provided at the end of the upward movement of the piston, and is a heated molten liquid of the thermoplastic granular organic resin. The present invention is intended to provide a press machine for producing a sample for a metal phase test, which is provided with a shut-off valve which is operated by the gas release port to prevent the gas from flowing out from the gas release port.

According to a fourth aspect of the present invention, when the piston is moved up in the third aspect, a gas release port for releasing the heated and pressurized gas in the chamber to the outside air is provided in the upper cover or the chamber of the hot press body. The gas escape passage formed at the upper peripheral wall is operated by the heated molten liquid of the thermoplastic granular organic resin at the final stage of the movement of the piston at the end of the movement of the piston, thereby preventing the gas from flowing out from the gas escape passage. A shutoff valve is provided.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIGS. 1 and 2A and 2B, the hop press according to the prior art illustrated in FIG. 5 will be described in detail with reference to FIGS. It has the same configuration as the machine a in the following points. That is, the hot press machine 1 includes a hot press body 5 including a chamber 3 that can be heated by a heat source such as a heater 2 and an upper lid 4 that allows the upper end opening 3a of the chamber 3 to be closed. Then, the metal body 6 which is further fitted inside the chamber 3 so as to be able to move up and down and which is to be subjected to the metal phase test is placed upright, and the thermoplastic granular organic resin 7 is put into the chamber 3 and deposited. A possible piston 8 is provided.

In the hot press machine 1 as described above, according to the first aspect, when the piston 8 is moved upward, the hot pressurized gas due to the residual gas existing in the chamber 3 is supplied to the hot press body 5. A gas release port 9 that can be released to the outside air is provided. As set forth in claim 2, the set position of the gas release passage 9 is as follows.
FIG. 1 shows an example in which the upper cover 4 which is a component of the hot press body 5 is penetrated, and FIG. As shown in FIG. 2A, FIG. 2B discloses a structure formed between the upper lid 4 and the chamber 3.

In FIG. 1, the upper cover 4 has a gas escape port 9 having an upper end 9a open to the outside and a lower end 9b opening the chamber 3 to the outside.
In FIG. 2A, a gas escape port 9 is provided in the upper peripheral wall 3b of the chamber 3 in a lateral direction, and in FIG. 4 and a concave groove 3 notched in the upper peripheral edge 3c of the chamber 3
A gas release passage 9 is formed between the gas discharge port 9 and the gas discharge port 9.

Next, in the press apparatus for producing a sample for a metal phase test according to the third aspect, not only the gas release port 9 is provided in the hot press machine 1 but also the gas release. At the end of the above-described upward movement of the piston 8 into the passage 9, the heated melt is blown out from the gas release passage 9 by being operated by the heated melt of the thermoplastic granular organic resin 7. Shut-off valve 1
0 is provided as shown in FIGS. And, as shown in claim 4, the shut-off valve 10 is provided for the gas release passage 9 penetrating through the upper lid 4 or the upper peripheral wall 3b of the chamber 3.

In the embodiment shown in FIG.
0 is a gas escape passage 9 vertically penetrating the upper cover 4
The gas release passage 9 is provided with an upper cylindrical hole 9c whose upper end port 9a opens to the outside air, and a lower flared valve seat 9d which is formed to expand from the lower end to the lower end port 9b. And is constituted by. The illustrated closing valve 10 has an insertion rod-shaped portion 10a which is loosely fitted and penetrated into the upper cylindrical hole 9c, and a truncated cone-shaped valve portion formed continuously from the lower end thereof and formed to have a large diameter downward. 10b and a retaining portion 10c provided at a portion where the insertion rod-shaped portion 10a extends upward from the upper lid 4.

The shut-off valve 10 is in a normal state, and the retaining portion 10c is supported by the upper lid 4. At this time, the frusto-conical valve portion 10b is connected to the gas outlet 9
Of the above, and of course, the heating and pressurizing gas in the chamber 3 is:
The gas can be discharged to the outside air through the gas gap G formed between the gas release port 9 and the shutoff valve 10.

However, when the piston 8 is moved upward and is in the heated molten liquid of the thermoplastic granular organic resin 7 and its liquid level rises, the liquid level becomes higher than that of the frustoconical valve portion 10b of the closing valve 10. The lower end surface is pushed upward, and as a result, the frustoconical valve portion 10b is pressed against the lower trapezoidal valve seat 9d of the gas release passage 9. As a result, the above-mentioned heated molten liquid is prevented from flowing out to the outside air from the gas release passage 9, so that no accidents occur due to blowing of the heated molten liquid and the thermoplastic granular organic resin The problem of undesired consumption of 7 is also solved.

Next, the shut-off valve 10 is connected to the chamber 3 as described above.
FIG. 4 shows a case in which a gas release port 9 provided in the upper peripheral wall 3b is provided to prevent the flow of the heated melt.
This will be described in detail. In this embodiment, the liquid level detecting element 10d provided in the chamber 3 detects that the liquid level of the heated molten liquid by the thermoplastic granular organic resin 7 has reached a predetermined height, and a detection signal obtained thereby. Is input to the electric controller 10e, and the output signal is input to the electrically openable and closable shut-off valve 10 provided with the gas release port 9 so that the gas release port 9 is closed. It is configured to be able to. Of course, it is also possible to adopt such a configuration for the gas release port 9 in the upper lid 4 described above.

[0021]

According to the first aspect of the present invention, since the present invention is constructed as described above, the liquid level of the heated molten liquid by the thermoplastic granular organic resin rises, and the heating and pressurizing in the chamber is performed. Even if gas is generated, it is released from the chamber through the gas release port to the outside air, so when the heated molten liquid is going to solidify, the heated pressurized gas enters and cracks or swells. This prevents the occurrence of defective products in the metal test sample, forms a uniform resin part, reduces the time required to produce the metal phase test sample by about 75%, and obtains a 0% result in the defect rate. Was done. According to the second aspect, the above-mentioned effect is guaranteed by specifying the position of the gas release opening in the first aspect.

According to a third aspect of the present invention, a shut-off valve is provided at the gas release passage, so that not only the heating and pressurizing gas is released but also the heat-melted liquid of the thermoplastic granular organic resin is removed.
Flowing out of the chamber is also prevented in a timely manner, thereby preventing danger from occurring and improving the yield. According to the fourth aspect, the above effects can be ensured by specifying the positions of the gas release passage and the shutoff valve of the third aspect.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional front view of an essential part showing one embodiment of a press machine for producing a sample for a metal phase test according to claim 1 of the present application.

FIGS. 2A and 2B are longitudinal sectional front views of essential parts showing different embodiments according to the first aspect.

FIG. 3 is a vertical sectional front view showing a main part of the press machine according to the third embodiment.

FIG. 4 is a longitudinal sectional front view of an essential part showing another embodiment according to claim 3;

FIG. 5 is an explanatory view showing the steps of a method for producing a metal phase test sample using a conventional hot press machine.

6 (a) to 6 (e) are front views showing examples of various defective product aspects of a sample for a metal phase test produced by the hot press machine of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hot press machine 3 Chamber 3a Upper opening 3b Upper peripheral wall 3c Upper opening peripheral edge 4 Top lid 5 Hot press body 6 Metal body 7 Thermoplastic granular organic resin 8 Piston 9 Gas escape passage 10 Closing valve

Claims (4)

[Claims] 1. A hot press body comprising a heatable chamber, an upper lid capable of closing an upper end opening of the chamber, and a metal body which is fitted inside the chamber so as to be movable up and down, and on which a metal body is mounted. And a piston capable of depositing and depositing thermoplastic granular organic resin in the chamber, wherein the hot press body includes a piston inside the chamber when the piston is raised. A press machine for producing a sample for a metal phase test, wherein a gas release port is formed to allow a heated and pressurized gas to be released to the outside air. 2. A gas escape opening for allowing the heated and pressurized gas in the chamber to be released to the outside air when the piston is moved upward, is provided with an upper lid or an upper peripheral wall of the chamber or an upper peripheral wall of the chamber and an upper peripheral edge of the upper opening of the chamber. 2. The press apparatus for producing a sample for a metal phase test according to claim 1, wherein the apparatus is formed between the two. 3. A hot press body comprising a heatable chamber, an upper lid capable of closing an upper end opening of the chamber, and a metal body which is fitted inside the chamber so as to be movable up and down, and on which a metal body is mounted. And a piston capable of charging and depositing a thermoplastic granular organic resin in the chamber, wherein the hot press body includes: A gas release port capable of releasing heated and pressurized gas to the outside air is formed, and the gas release port is operated by a heated molten liquid of a thermoplastic granular organic resin at the end of the rising of the piston. A press valve for producing a sample for a metal phase test, wherein a closing valve is provided to prevent the gas from flowing out from the gas release port. 4. A gas outlet for allowing the heated and pressurized gas in the chamber to be released to the outside air when the piston is moved upward is formed in the upper lid of the hot press body or the upper peripheral wall of the chamber. 4. The closing valve according to claim 3, further comprising: a closing valve that is operated at the end of the ascent of the piston by a heated melt of the thermoplastic granular organic resin to prevent the gas from flowing out from the gas outlet. Press machine for producing samples for metal phase test.