JPH02226042A - Material tester - Google Patents

Abstract

PURPOSE:To handle a tester with ease by providing a punch for a plurality of sample holders arranged with a distance from each other on the same outer periphery on a rotary table, pressing said holders upwards at a predetermined position, applying a load to said holders via said punch, and detecting the added load and displacement of a sample. CONSTITUTION:A rotary table 6 which is placed in a chamber 4 fixed to a frame 1 is rendered rotatable by a motor 10, and a punch is provided slidably in a plurality of sample holders 11 arranged on the same circumference on the table 6. Moreover, a push-up mechanism B and a push-down mechanism C are provided at a station A in the chamber, so that a push-up rod 23 having a displacement detecting rod 24 inserted into a front end thereof can be pushed up by a motor 30 through a lift rod 27 or the like. A push-down 37 is inserted into a rod 32 fixed to the frame 1, with a screw rod 38 rigidly secured to an upper part of the rod 37 through a punch load cell 37, so that the rod 37 can be pressed down by a motor 41. The deformation of a sample in the holder 11, and the load when the sample is deformed are respectively detected by differential transformers 43, 43, and cell 37.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a material testing machine, and in particular, it applies a dent to the approximate center of a sample made of an extremely thin flat plate, and measures the load and displacement at that time. This invention relates to a material testing machine designed to perform measurements.

[Conventional technology and its issues]

In general, changes in the irradiation characteristics of materials used in the technical field of nuclear power, etc., and in a radiation environment, are
There is a known material testing method in which a dent is made in the center of a sample made of an extremely thin plate, etc., and the load and displacement at that time are made to be n1 constant. . Conventionally, the material testing machine used for this type of testing method is a normal tension-compression type material testing machine, and when testing with this tension-compression type testing machine, a special device for holding the sample is used. A jig is prepared and set in the material testing machine.

By the way, with this type of conventional dedicated jig, the sample is once set inside and then screwed to hold it, so handling this special jig is extremely troublesome. In particular, in the field of nuclear power, etc., tests are conducted in a radiation environment, so samples are handled remotely using a manipulator or the like, but this remote control makes handling the above-mentioned specialized jigs extremely cumbersome.

However, until now, no material testing machine has been proposed that is easy to handle and can efficiently, accurately, and easily measure changes in the irradiation characteristics of samples under the severe conditions required in the nuclear power field. It has not been.

Therefore, an object of the present invention is to provide a material testing device that solves the problems of the conventional techniques described above and that enables efficient, accurate, and easy measurement of changes in the irradiation characteristics of a sample under severe conditions. Our goal is to provide the following.

[Means for Solving the Three Problems] In order to achieve the above object, the present invention includes a rotary table, and a plurality of rotary tables arranged on the same circumference on the rotary table at intervals in the circumferential direction to hold samples. a sample holder; a punch provided on the sample holder for deforming the sample;
a push-up mechanism that pushes the sample holder upward at a predetermined position on the same circumference; a push-down mechanism that applies a load to the sample holder pushed up by the push-up mechanism to deform the sample via the punch; The present invention is characterized in that it includes a detector for detecting the magnitude of the load applied by the push-down mechanism and a detector for detecting the amount of displacement of the sample deformed by this load. , the push-down mechanism has a push-down rod slidably arranged inside a hollow fixed rod, and the sample holder is pushed up by the push-up mechanism until it comes into contact with the fixation rod, and then is pushed up by the push-down rod. It is characterized in that it is configured to be loaded with a load.

[For production]

According to the present invention, after setting the sample in the sample holder,
This sample holder is set on a rotary table, the push-up mechanism pushes up the sample holder at a predetermined position on the rotary table, the push-down mechanism applies a load to the sample holder, and this load pushes the sample through the punch. is deformed, and the load and deformation amount at this time are measured using a load cell and a differential transformer, respectively, to measure the strength of the sample. Then, by rotating the rotary table at predetermined angles and repeatedly applying a load to the sample holder that reaches the predetermined position, tests can be performed continuously.

According to another invention, a sample holder is fixed between a fixing rod and a push-up mechanism, thereby applying a predetermined load to the sample holder to prevent wrinkles from forming on the sample held by the sample holder. , Then, a load is applied to the sample holder using the push-down rod, the sample is deformed by this load via the punch, the load and the amount of deformation at this time are each determined n1 by a differential transformer, and the strength of the sample is measured. do. In this way, it is possible to accurately test a sample made of an extremely thin flat plate.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a material testing machine according to the present invention will be described below with reference to the accompanying drawings.

In FIG. 1, reference numeral 1 denotes a box-shaped frame, which is placed on a foundation 3 via anti-vibration pads 2.2. A chamber 4 is fixed approximately at the center of the frame 1, and the chamber 4 is provided with a front door 5 that can be opened and closed. A rotary table 6 that rotates in a horizontal plane is disposed within the chamber 4 . The rotary table 6 has a rotary shaft 7, and a motor 10 for rotating the table is connected to the rotary shaft 7 via a gear 8.9.

Further, on the rotary table 6, a plurality of sample holders 11, 11, . . . 11 for sample placement are arranged on the same circumference.
is located. As shown in FIG. 2, this sample holder 11 consists of an upper holder 12 and a lower holder 13.
It is embedded in 4. The upper holder 12 has a through hole 12a in the center thereof, and a punch support rod 16 is fitted into this through hole 12a. A punch 17 is attached to the tip of the punch support rod 16, and the punch 17 is adapted to slide up and down in a hole 18a of an upper die 18 fixed to the lower part of the upper holder 12. The lower holder 13 is the upper die 18
It has a lower die 19 at the upper part facing the lower die 1.
A through hole 1 is located in the center of the overlapping lower holder 13.
3a is bored. The upper die 18 and one lower die have shapes that fit into each other, and the clamping surface 1 of the upper die 18
A rectangular sample 20 (FIG. 3) made of an extremely thin flat plate is interposed between the sample 8b and the clamping surface 19b of the lower die 19. Note that the upper holder 12 and the lower holder 13 have shapes that fit into each other, and for this purpose, an annular flange 21 is provided on the upper surface of the lower holder 13 in a protruding manner.

Also, in the chamber 4, there is a station A for performing the test.
is provided. In this station A, a push-up mechanism B and a push-down mechanism C are provided so that a load can be applied from above and below to the sample holder 11 located there.

The push-up mechanism B has a push-up rod 23 that moves up and down, and the tip of the push-up rod 23 is formed to engage with four parts of the lower surface of the lower holder 13 (FIG. 2). Further, the push-up rod 23 is hollow, and a displacement detection rod 24 projecting upward is inserted into the hollow. The tip of this detection rod 24 is connected to the tip of the push-up rod 23 that is attached to the lower holder 1.
When the four parts of the lower surface of the sample 3 are engaged with each other, the lower holder 13 enters the through hole 13a (FIG. 2) and comes into contact with the lower surface of the sample 20 located above the through hole 13a. Furthermore, a differential transformer 25 that directly detects the amount of displacement of the lower surface of the sample 20 is connected to the displacement detection rod 24 . The push-up rod 23 is fixed to an elevating head 27, and both ends of the elevating head 27 are screwed into a pair of threaded rods 28, and these threaded rods 28 are connected via a plurality of gears 29, 29...29 for elevating and lowering. It is connected to a motor 30. That is, when the motor 30 rotates, the lifting head 27 moves up and down via the gear 29 and the screw stud 28, and the push-up rod 23 moves up and down integrally with this.

The push-down mechanism C has a fixed rod 32.

This fixed rod 32 is fixed to the frame 1 via a bar 33 and also fixed to a hanging frame 35 via a load cell 34. This hanging frame 35 is fixed to the frame 1.

Also, a push rod 36 that moves up and down is provided inside the fixed rod 32.
is inserted, and an upper threaded rod 38 is fixed to the upper end of this push-down rod 36 via a punch load cell 37 that detects punch force. The upper threaded rod 38 is screwed into a gear 39, and a punch motor 41 is connected to these three gears via a gear 40. Further, a horizontally projecting bar 42 is fixed to the upper end of the push-down rod 36, and this bar 42
A pair of differential transformers 43 and 43 are interposed between the suspension frame 35 and the suspension frame 35 to detect the amount of deformation caused by the punch force.

Moreover, an environmental tank 45 for creating various test environments is provided inside the chamber 4, and this environment pa45 has an opening 45a at the bottom. 46 is a vibrator that circulates gas such as nitrogen, and 47 is a heater. Also,
An exhaust pipe 48 is connected to the chamber 4 accommodating the environmental bath 45 .

49, 50, and 51 are bellows for maintaining airtightness within the chamber 4.

Next, the operation of this embodiment will be explained.

First, the front door 5 of the chamber 4 is opened and the sample holders 1 are inserted into the plurality of setting holes 14 drilled in the rotary table 6.
1.11...Set 11. At this time, the sample 20 is set in the sample holder 11 as shown in FIG.

Next, the lifting motor 30 is rotated to raise the lifting head 27 and the push-up rod 23 together. Then, the tip of the push-up rod 23 pushes up the sample holder 11, and the sample holder 11 enters the environmental bath 45 through the opening 45a. When the upper surface of the upper holder 12 (FIG. 2) comes into contact with the lower surface of the fixed rod 32, at that point the motor 30
rotation is stopped, and the sample holder 11 is fixed between the push-up rod 23 and the fixing rod 32.

By fixing the sample holder 11 in this manner, the sample 20 held between the clamping surfaces 18b, 19b (FIG. 2) of the sample holder 11 is held taut, that is, without wrinkles. This is particularly effective when the sample 20 is extremely thin. At this time, the wrinkle suppressing load is applied by the motor 30, and the magnitude of this load is detected via the load cell 34 described above.

On the other hand, rotate the punch motor 41 to
8 and the push rod 36 are lowered together. At this time, since the protrusion of the punch support rod 16 (FIG. 2) has already entered the hole of the fixed rod 32, the punch support rod 16 and the punch 17 are integrally pushed downward by the push-down blade of the push-down rod 36. With this punch 17, the sample 20 (second
Figure) is recessed.

As a result, the center of the sample 20 is displaced, but the magnitude of the load applied at this time and the amount of deformation are determined by the punch load cell 37 that detects the load and the differential sensor that detects the amount of deformation of the sample 20. Detected by transformer 25. Note that the differential transformer 43 described above detects the amount of pushing into the sample 20 by the punch 17.

Next, when the test on the sample 20 is completed, the push-down rod 36 is raised, the push-up rod 23 is lowered, and the rotary table motor 10 is rotated to rotate the rotary table 6 by a predetermined angle. Then, when the next sample 20 reaches test station A, the same test as described above is performed on this sample 20 that has arrived. This test is repeated one after another, and when the test on all the samples 20 is completed, the front door 5 of the chamber 4 is opened and all the sample holders 11, 11, . . . , 11 are replaced with new ones.

As described above, according to this embodiment, it is possible to test the sample 20 extremely easily, automatically, and continuously, and moreover, the test can be performed with high accuracy even under harsh environments. Particularly in the field of nuclear energy, etc., it is necessary to handle samples with a manipulator due to radioactivity, but this greatly simplifies test setups. That is, the sample 20 is set in the sample holder 11 in advance, and the sample holder 11 is then placed on the rotary table 6 using a manipulator or the like, so the test setup is extremely simple and safe. can improve sex.

Further, FIG. 4 shows another embodiment, in which the sample holder 11 can set a circular sample 55 as shown in FIG.

Other configurations are the same as described above. Furthermore, FIG. 6 shows another embodiment, according to which the upper die is not provided on the upper holder 12 side, and when this sample holder 11 is used, the sample is supported at both ends. A bending load of 100 lbs. is applied and a bending test is conducted.

Therefore, this material testing machine can set samples of various shapes by simply changing the shape of the sample holder 11, making it extremely versatile.

Although the present invention has been described above based on one embodiment, it goes without saying that this principle can be applied to various tests such as tension, compression, bending, and punching tests.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, a plurality of sample holders holding samples are arranged on a rotary table, and while the rotary table is rotated at a predetermined angle, a push-up mechanism and a push-down mechanism are used to Load the sample holder,
The sample is deformed by this load, and the magnitude of the load and the amount of deformation of the sample are detected using a load cell and a differential transformer, allowing easy and continuous testing with high accuracy. It can be carried out.

[Brief explanation of the drawing]

FIG. 1 is a front view showing an embodiment of the material testing machine according to the present invention, FIG. 2 is a cross-sectional view showing an embodiment of the sample holder, and FIG. FIG. 4 is a cross-sectional view showing another example of the sample holder, FIG. 5 is a plan view showing a sample set in the sample holder of FIG. 4, and FIG. FIG. 7 is a sectional view showing another embodiment. DESCRIPTION OF SYMBOLS 1... Frame, 4... Chamber, 6... Rotating table, 11... Sample holder, 20... Sample, 23
... Push-up rod, 25.43... Differential transformer for detecting displacement amount, 32... Fixed rod, 36... Push-down rod, 37... Punch load cell, B... Push-up mechanism, C...Press mechanism.

Claims (1)

[Claims] 1. A rotary table, a plurality of sample holders arranged on the same circumference on the rotary table at intervals in the circumferential direction and holding the samples, and a plurality of sample holders provided on the sample holder and holding the samples. A punch for deforming, a push-up mechanism for pushing the sample holder upward at a predetermined position on the same circumference, and a load for deforming the sample is applied to the sample holder pushed up by the push-up mechanism via the punch. A material testing machine comprising: a push-down mechanism; a detector that detects the magnitude of the load applied by the push-down mechanism; and a detector that detects the amount of displacement of a sample deformed by the load. 2. The push-down mechanism has a push-down rod slidably arranged inside a hollow fixed rod, and the sample holder is pushed up by the push-up mechanism until it comes into contact with the fixation rod, and then the push-down rod is pushed up. 2. The material testing machine according to claim 1, wherein the material testing machine is configured to be subjected to a load by.