JPH0585019B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a loading device for an ultra-fine material testing machine.

[Conventional technology]

The ultra-fine materials testing device is equipped with an electromagnetic force generating means at one end of a balance-shaped bar and an indenter at the other end, and the balance is unbalanced by supplying a load current to the electromagnetic force generating means. There is one that pushes an indenter into the sample surface. As shown in FIG. 3, this type of conventional loading device generates an upward force by energizing an electromagnetic force generating section 30 composed of an electromagnetic coil 29 and a core, and generates a force connected to the generating section. One end of the transmission lever 31 is pushed up around the fulcrum 32, and the other end is pushed down. One end of a leaf spring 33 for generating force transmission is connected to the other end of the lever 31, and the other end of the leaf spring 33 is
It is connected to a connecting piece 36 provided on a vertical holder 34 that holds the indenter 35. Therefore, when the lever 31 on the electromagnetic force generation section 30 side is pushed up, the indenter holder 34 is pushed down via the generated force transmission leaf spring 33, and the indenter is pushed into the sample.

[Problem to be solved by the invention]

In the conventional loading device described above, when a test load is applied to the indenter, a compressive load is applied to the generated force transmitting leaf spring, so that when the test load becomes large, the leaf spring may buckle. Therefore, there was a problem that the load was limited to about 50 gf. In addition, the leaf springs had a high rate of damage, so parts had to be replaced quite frequently. In order to solve this problem, attempts were made to increase the strength of the leaf spring by making it thicker, but this was not desirable because the sensitivity would decrease.

Therefore, an object of the present invention is to provide a loading device that can increase the test load and reduce the failure rate of the leaf spring even if a leaf spring similar to the conventional one is used.

[Means to solve the problem]

In order to solve the above problems, the present invention employs the following configuration.

In other words, the loading device of the ultra-fine materials testing machine according to the present invention has an indenter attached to the lower end of an indenter holder that is movable in the vertical direction, and a fulcrum that is provided in the middle of the indenter and rotates up and down. The load transmission lever includes a freely adjustable load transmission lever, and a load generation section that is provided at one end of the load transmission lever and applies an upward load to the end, the end of the load transmission lever opposite to the load generation section. is characterized in that it is connected to the indenter holder above the end portion via a leaf spring.

[Effect]

When the load of the load generator is applied upward to the end of the balance-type load transmission lever, the opposite end of the lever applies a downward force to the indenter holder via the leaf spring, so that the indenter is pushed against the sample surface. pushed into. At this time, a tensile load is applied to the leaf spring, so buckling or bending does not occur.

〔Example〕

FIG. 1 is a sectional view showing the structure of an apparatus according to an embodiment of the present invention, in which a self-balancing electronic balance type loading device 1 is provided within a frame 20. As shown in FIG. This loading device 1 unbalances an electronic balance by supplying a load current to an electromagnetic coil 3 and applies a test load using an indenter 6. FIG. 2 schematically shows the configuration of this loading mechanism. That is, the cup-shaped electromagnetic coil 3 of this loading device 1 has its open portion facing downward, and a balance type load transmission lever 21 is provided below the electromagnetic coil 3. When a DC load current is supplied from the measurement control device 12 to the electromagnetic coil 3, an electromagnetic force is generated that pulls up the lever 21, and a force that pushes down the other end of the lever 21 acts around a fulcrum 22 provided in the middle. . The lower end of a leaf spring 23 provided in the vertical direction is connected to the other end of the lever 21, and the upper end of this leaf spring is connected to a connecting piece of a vertically movable holder 25 that holds the indenter 6. It is connected to 24. In the load transmission mechanism configured in this way, when the end of the load transmission lever 21 on the electromagnetic force generating section side is pulled up,
Since the load transmission lever 21 rotates and pulls the leaf spring 23 downward, the indenter holder 2 is
5 is pushed down, and the indenter 6 is pushed into the sample surface.

A differential transformer-type displacement detector 5 is provided above the indenter 6, and detects the displacement (indentation depth) on the surface of the sample 7 pressed by the indenter 6 while a load is applied. . The amount of displacement detected by the displacement detector 5, that is, the amount of movement of the indenter 6, is quantitatively captured by a displacement measuring device (amplifier) 10 and stored in a measurement control device 12. Since the load generated by the loading device 1 is input to the measurement control device 12, displacement under a certain load can be measured in real time. The measurement control device 12 performs arithmetic processing on the obtained data and outputs necessary measurement results to a recording device 13 such as a recorder (not shown).

The embodiment device is provided with an optical monitor 15 as an auxiliary device. The optical monitor 15 includes an objective lens 17, an eyepiece 16, etc., and is used by an operator to measure the position on the surface of the sample 7 to be tested and to observe the state of the depression formed by the indenter 6. It will be done. Note that the sample stage 8 has a structure that can be raised and lowered, and a stage 9 that can be moved in the X-Y direction and rotational direction is detachably provided, and a vice for fixing the sample 7 is attached to the upper surface of the stage 9. . By operating the sample stage 8, the indenter 6 and the sample 7 can be brought closer together or moved to an arbitrary test position.

Since this embodiment apparatus is constructed as described above, the load is transmitted to the indenter while a tensile load is applied to the leaf spring that transmits the test load. Therefore, buckling of the leaf spring can be avoided, and the test load can be increased. For this reason, the leaf spring can be shortened, which is advantageous in making the entire testing machine more compact. Furthermore, since tension is always applied to the leaf spring, the breakage rate of the leaf spring can be reduced, and there is no bending at the start of loading, which improves the indenter's indentation accuracy. Furthermore, since the coil of the electromagnetic force generating section is installed with the open part facing downward, dust and the like will not accumulate in the electromagnetic force generating section, and malfunctions due to dirt can be prevented.

〔Effect of the invention〕

As is clear from the above description, according to the loading device of the ultra-fine material testing device according to the present invention, a tensile load is applied to the leaf spring that transmits the test load, so it is possible to increase the test load and It has become possible to reduce the risk of damage.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing the configuration of an embodiment of the present invention;
FIG. 2 is a diagram schematically showing the configuration of main parts, and FIG. 3 is a diagram schematically showing the configuration of a conventional device. DESCRIPTION OF SYMBOLS 1... Loading device, 6... Indenter, 21... Load transmission lever, 23... Leaf spring, 24... Connection piece, 25... Indenter holder.

Claims (1)

[Claims] 1. An indenter attached to the lower end of an indenter holder that is movable in the vertical direction, a scale-shaped load transmission lever that is vertically rotatable around a fulcrum provided in the middle, and one end of the load transmission lever. a load generating section that applies an upward load to the end of the load transmitting lever; A loading device for an ultra-fine materials testing machine, characterized in that it is connected to a holder.