JP2011112544A - High-temperature compression testing apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a high-temperature compression testing apparatus for accurately controlling the load applied to an object to be tested, by improving a resolution of the load applied to the object to be tested. <P>SOLUTION: The high-temperature compression tester includes: a high-temperature furnace 16; first and second pressurizing rods 21, 22 entering the high-temperature furnace 16, and pressurizing the object to be tested 23 accommodated in the high-temperature furnace 16 from both sides; a crosshead 11; a load cell 26 for detecting a pressure applied to the object to be tested 23; a displacement detection meter 25 for detecting a displacement of the object to be tested 23; and an elastic mechanism 13, disposed between the first pressurizing rod 21 and the crosshead 11. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a high-temperature compression test apparatus that performs a compression test of a specimen by applying pressure to the specimen at a high temperature.

  Such a high-temperature compression tester has a configuration in which a specimen made of a refractory or the like is maintained at a high temperature and a high pressure, and the characteristics are evaluated under conditions approximate to the actual use state of the refractory (for example, , See Patent Document 1).

JP 2007-155607 A

  Standards for performing a test using such a refractory as a test body include JIS (Japanese Industrial Standard) R2207: test method for thermal expansion of refractory, JIS R2209: test method for load softening point of refractory brick , JIS R2658: Refractory brick compression creep test method and the like are set, and a heating method, a temperature measurement method, a displacement measurement method and the like are defined for each standard.

  In such a standard, it is required to execute the test in a state where the test force applied to the specimen is maintained constant. For example, in JIS R2207-2, it is required to maintain a pressure of 0.01 MPa (megapascal) with a load accuracy of plus or minus 1 N (Newton). In JIS R2209 and JIS R2658, it is required to maintain the pressure with an accuracy of plus or minus 0.04 MPa with respect to 0.2 MPa. This holding of the test force needs to be continued even during heating. However, during heating, the heating rod that applies pressure to the specimen expands due to thermal expansion, so heating that applies pressure to the specimen. It is necessary to finely move the rod in the direction opposite to the pressing direction.

  By the way, in such a test apparatus, the position control resolution of the pressurizing mechanism for adding the test specimen is, for example, about 0.03 μm. The rigidity of the pressure mechanism is about 200 to 400 kN / mm, and the rigidity of the pressure bar that directly applies pressure to the test body is about 20 kN / mm. For this reason, the rigidity of the whole pressurizing mechanism in the test apparatus is about 20 kN / mm. Therefore, the amount of change in the load per position accuracy resolution is about 0.6N obtained by multiplying the rigidity of the entire pressure mechanism in the test apparatus by the position control resolution of the pressure mechanism.

  The amount of change in load is on the same order as the load accuracy of plus or minus 1N required by the standard. For this reason, even if the load is controlled using PID control or the like, the resolution of the pressurizing mechanism for controlling the load is not sufficient, so that the control of the load applied to the specimen is sufficiently accurate. It will be difficult to do.

  The present invention has been made to solve the above problems, and by increasing the resolution of the load applied to the test body, the high-temperature compression test can control the load applied to the test body with higher accuracy. An object is to provide an apparatus.

  The invention described in claim 1 is a high temperature compression test apparatus for performing a compression test of a test body by applying pressure to the test body at a high temperature, and a high temperature furnace capable of storing the test body, and the high temperature furnace. A first pressurizing member that presses the test body accommodated therein from both sides, a pressurizing mechanism that applies a pressing force to the first pressurizing member, and the second pressurizing member. A support member that supports the member, a load cell that detects pressure applied to the test body, a displacement detector that detects a displacement amount of the test body, and between the pressurizing mechanism and the test body, or An elastic mechanism disposed between the support member and the test body is provided.

  According to a second aspect of the present invention, in the first aspect of the invention, the first pressure member is composed of a first pressure rod that enters the high temperature furnace and presses the specimen. The pressurizing mechanism is a crosshead that moves in the direction in which a pressing force is applied to the specimen, and the elastic mechanism is disposed between the first pressurizing rod and the crosshead.

  According to a third aspect of the present invention, in the second aspect of the present invention, the elastic mechanism includes a compression spring disposed between the first pressure bar and the crosshead.

  According to a fourth aspect of the present invention, in the first aspect of the invention, the second pressure member is composed of a second pressure rod that enters the high temperature furnace and presses the specimen. The support member is a base that supports the second pressure bar via the load cell, and the elastic mechanism is disposed between the second pressure bar and the base.

  The invention according to claim 5 is the invention according to claim 4, wherein the elastic mechanism includes a compression spring disposed between the second pressure bar and the base.

  According to the invention described in claim 1, by reducing the rigidity of the apparatus by the action of an elastic mechanism disposed between the pressurizing mechanism and the test body or between the support member and the test body, The resolution of the load applied to the test body can be increased, and the load applied to the test body can be controlled with higher accuracy.

  According to the second aspect of the present invention, when the first pressure rod having heat resistance is allowed to enter the high temperature furnace and the pressing force is applied to the first pressure rod by the cross head, the elastic mechanism Is disposed between the first pressure rod and the crosshead, the resolution of the load applied to the specimen can be increased.

  According to the invention described in claim 3, by selecting the elasticity of the compression spring, the resolution of the load applied to the specimen can be set to an appropriate value.

  According to the invention described in claim 4, when the second pressure rod having heat resistance is allowed to enter the high temperature furnace and the second pressure rod is supported by the base, the elastic mechanism is subjected to the second pressure. By disposing between the bar and the base, it becomes possible to increase the resolution of the load applied to the test body.

  According to the fifth aspect of the present invention, by selecting the elasticity of the compression spring, the resolution of the load applied to the specimen can be set to an appropriate value.

1 is a front view of a high temperature compression test apparatus according to the present invention. It is an enlarged view near the high temperature furnace 16 in the high temperature compression test apparatus according to the present invention. It is an enlarged view which shows the elastic mechanism 13 in the high temperature compression test apparatus based on this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a front view of a high-temperature compression test apparatus according to the present invention.

  This high-temperature compression test apparatus is for performing a compression test of a test body by applying pressure to the test body 23 at a high temperature. The high-temperature furnace 16 capable of storing the test body 23 and the high-temperature furnace A first pressure bar 21 and a second pressure bar 22 for entering the inside 16 and pressing the test body 23, and a crosshead 11 for applying pressure to the test body 23 via the first pressure bar 21 The load cell 26 for detecting the pressure applied to the test body 23, the displacement detector 25 for detecting the displacement amount of the test body 23, and the crosshead 11 and the first pressure rod 21 are disposed. And an elastic mechanism 13.

  The load cell 26 is fixed on the base 18 of the apparatus. Further, nut portions (not shown) that are screwed with a pair of screw rods disposed in the frame 12 erected on the left and right of the base 18 are disposed at both ends of the cross head 11. Then, as the pair of screw rods are rotated by driving a motor (not shown), the cross head 11 moves in the vertical direction. That is, the cross head 11 applies pressure to the test body 23 stored in the high temperature furnace 16 via the first pressure rod 21 by moving in the direction in which pressure is applied to the test body 23. Function as a pressurizing mechanism.

  Instead of using such a crosshead 11 to apply pressure to the first pressure rod, other actuators that directly press the first pressure rod 21 may be used.

  The high temperature furnace 16 includes a chamber 15 and a heating unit 14 formed around the chamber 15. The high temperature furnace 16 is provided with an inert gas supply unit 17 for introducing an inert gas such as argon into the chamber 15.

  FIG. 2 is an enlarged view of the vicinity of the test body 23 in the high-temperature compression test apparatus according to the present invention.

  The second pressurizing rod 22 is fixed on the support base 46, and the upper end portion thereof enters the high temperature furnace 16. Similarly, the lower end portion of the first pressure rod 21 enters the high temperature furnace 16. As the material of the first pressure rod 21 and the second pressure rod 22, for example, graphite is used so as not to be affected even in an atmosphere of about 1500 degrees Celsius in the high temperature furnace 16. As described above, the inside of the high-temperature furnace 16 is purged with an inert gas, thereby preventing the first and second pressurizing bars 21 and 22 from being affected by oxidation at a high temperature.

  The support base 46 is disposed on the load cell 26. For this reason, it is possible to measure the pressure applied to the specimen 23 by measuring the pressing force applied to the load cell 26 from the support base 46 by the load cell 26.

  A convex portion 43 is formed on the first pressure rod 21, and an L-shaped member 45 that extends through the support base 46 extends from the convex portion 43. Similarly, a convex portion 44 is formed on the second pressure rod 22, and an L-shaped member 47 that extends through the support base 46 extends from the convex portion 44. And between these L-shaped members 45 and 47, the displacement detector 25 for detecting the displacement amount of the test body 23 by measuring the distance between these L-shaped members 45 and 47 is arrange | positioned. Has been. A temperature sensor 24 for measuring the temperature in the high temperature furnace 16 is disposed on the side of the second pressure rod 22.

  FIG. 3 is an enlarged view showing the elastic mechanism 13 in the high-temperature compression test apparatus according to the present invention.

  The elastic mechanism 13 is disposed between the cross head 11 and the first pressure rod 21, and includes a pressing member 32 having a contact portion 31 that contacts the upper end of the first pressure rod 21. Prepare. The pressing member 32 is disposed so as to be movable with respect to the cross head 11 via a guide member 41 and a slide member 42 fixed to the cross head 11.

  The pressing member 32 is connected to a pair of support rods 37 via a connecting member 36. A stop member 38 is attached to the upper end of the support rod 37, and a spring 39 is disposed in a region between the stop member 38 and the crosshead 11 on the outer peripheral portion of the support rod 37. For this reason, the pressing member 32 is supported by the cross head 11 by the action of the support rod 37 and the spring 39.

  Furthermore, a fixed plate 35 is fixed to the cross head 11 via a fixed shaft 34, and a compression spring 33 is interposed between the pressing member 32 slidable with respect to the cross head 11 and the fixed plate 35. It is arranged. For this reason, the pressing force applied by the cross head 11 is applied to the test body 23 via the compression spring 33, the pressing member 32, and the first pressing rod 21 in the elastic mechanism 13.

  In the high-temperature compression test apparatus having the above-described configuration, the test body 23 is disposed between the first pressure rod 21 and the second pressure rod 22 in the high-temperature furnace 16, and the crosshead 11 is not shown in the motor. , The test body 23 is compressed under high temperature heating. Then, the displacement amount of the test body 23 at that time is measured by the displacement detector 25, and the pressing force applied to the test body 23 at that time is measured by the load cell 26. Further, the temperature in the high temperature furnace 16 at that time is measured by the temperature sensor 24.

  At this time, as described above, the rigidity of the entire pressurizing mechanism in a general high-temperature pressurizing test apparatus is determined by the rigidity of the first and second pressurizing bars 21 and 22 in the conventional case. However, in the high-temperature compression test apparatus according to the present invention, since the elastic mechanism 13 is disposed between the first pressure bar 21 and the crosshead 11, by adjusting the elasticity of the compression spring 33, This rigidity can be changed.

  As described above, the position control resolution of the pressurizing mechanism that imparts addition to the test body in a general high-pressure compression test apparatus is the rigidity of the first and second pressure bars that directly apply pressure to the test body 23. It is about 20 kN / mm. For this reason, the amount of change in the load per position accuracy resolution is about 0.6 N obtained by multiplying this rigidity, 20 kN / mm, by 0.03 μm, which is the position control resolution of the pressure mechanism.

  On the other hand, for example, when the rigidity of the compression spring 33 is set to about 100 N / mm, the change amount of the load per position accuracy resolution is 100 N / mm, which is the rigidity, and the position control resolution of the pressure mechanism. It becomes possible to make it fine to about 0.003N which multiplied by 0.03 μm. The amount of change in the load is much smaller than the load accuracy of plus or minus 1N required by the standard, so that the resolution of the pressurizing mechanism for controlling the load is sufficiently good, and is applied to the specimen 23. The load control to be performed can be made sufficiently accurate.

  In the above-described embodiment, the elastic mechanism 13 is disposed between the cross head 11 and the first pressure rod 21 constituting the pressure mechanism. However, the elastic mechanism 13 may be disposed at any position between the crosshead 11 and the test body 23. For example, by using an elastic body as the first pressure bar 21, the first pressure bar 21 can be used as an elastic mechanism disposed between the crosshead 11 and the test body 23.

  Next, another embodiment of the present invention will be described.

  In the first embodiment described above, the elastic mechanism 13 is disposed between the crosshead 11 that functions as a pressurizing mechanism and the test body 23. In the second embodiment, the elastic mechanism 13 functions as a support member. An elastic mechanism similar to the elastic mechanism 13 described above is disposed between the base 18 and the test piece 23. More specifically, it is described above at any position between the base 18 and the load cell 26, between the load cell 26 and the support base 46, or between the support base 46 and the second pressure rod 22. Similar to the elastic mechanism 13, an elastic mechanism including a compression spring is provided. Even when such a configuration is adopted, it is possible to sufficiently control the load applied to the specimen 23 by sufficiently improving the resolution of the pressurizing mechanism for controlling the load. .

  In the embodiment described above, an elastic mechanism provided with a compression spring is used. However, for example, a spring other than a compression spring such as a leaf spring may be used. Further, for example, an elastic member other than a spring having a predetermined elastic force such as rubber may be used.

DESCRIPTION OF SYMBOLS 11 Crosshead 13 Elastic mechanism 14 Heating part 15 Chamber 16 High temperature furnace 17 Inert gas supply part 18 Base 21 1st pressurization bar 22 2nd pressurization bar 23 Test body 24 Temperature sensor 25 Displacement detector 26 Load cell 32 Pressing member 33 Compression spring 35 Fixed plate 37 Support rod 46 Support base

Claims (5)

In a high-temperature compression test apparatus that performs a compression test of a test specimen by applying pressure to the test specimen at a high temperature,
A high-temperature furnace capable of storing the specimen,
First and second pressure members for pressing the test body stored in the high-temperature furnace from both sides thereof;
A pressure mechanism for applying a pressing force to the first pressure member;
A support member for supporting the second pressure member;
A load cell for detecting the pressure applied to the specimen;
A displacement detector for detecting the amount of displacement of the specimen;
An elastic mechanism disposed between the pressurizing mechanism and the test body, or between the support member and the test body;
A high-temperature compression test apparatus comprising: In the high-temperature compression test apparatus according to claim 1,
The first pressure member is composed of a first pressure rod that enters the high temperature furnace and presses the specimen,
The pressurizing mechanism is a crosshead that moves in a direction in which a pressing force is applied to the test body,
The elastic mechanism is a high-temperature compression test apparatus disposed between the first pressure bar and the crosshead. The high-temperature compression test apparatus according to claim 2,
The high temperature compression test apparatus, wherein the elastic mechanism includes a compression spring disposed between the first pressure bar and the cross head. In the high-temperature compression test apparatus according to claim 1,
The second pressure member is composed of a second pressure rod that enters the high temperature furnace and presses the specimen,
The support member is a base that supports the second pressure rod via the load cell,
The elastic mechanism is a high-temperature compression test apparatus disposed between the second pressure bar and the base. The high-temperature compression test apparatus according to claim 4,
The high-temperature compression test apparatus, wherein the elastic mechanism includes a compression spring disposed between the second pressure bar and the base.

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