JPH0389136A - Load apparatus for microscopic material tester - Google Patents

Abstract

PURPOSE:To enable the lowering of a breakage rate of a plate spring by making an end on the opposite side of a lever apply a downward force to an indenter holder through the plate spring when a load of a load generating section is applied upward to an end of a load transmitting lever to increase a test load. CONSTITUTION:When a load current is supplied to an electromagnetic coil 3 from a measurement controller 12, an electromagnetic force tending to pull up a lever 21 is generated to pull a plate spring 23 downward, which causes an indenter holder 25 to lower through a connecting piece 24 to force an indenter 6 into the surface of a sample. A displacement detector 5 detects a displacement of the surface of the sample 7. A displacement detected 5 is caught with a displacement measuring device 10 to be held into the device 12. As a load to be generated with a load device 1 is inputted into the device 12, a displacement under a certain load can be measured in real time. The device 12 performs a computation processing based on these data to output the results to a memory 13. Thus, a load is transmitted to the indenter with a tension load working on the plate spring 23 thereby enabling the avoiding of the buckling of the plate spring 23.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a loading device for an ultra-fine material testing machine.

[Prior Art] An ultra-fine material 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 operated by supplying a load current to the electromagnetic force generating means. There is a method in which the indenter is pushed into the sample surface by destroying the balance of the indenter. 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 connected to a connecting piece 36 provided on a vertical holder 34 that holds an indenter 35. is connected to. Therefore, when the lever 31 on the side of the electromagnetic force generating section 30 is pushed up, the indenter holder 34 is pushed down via the generated force transmission plate spring 33, and the indenter is pushed into the sample.

[Problems to be Solved by the Invention] In the conventional loading device described above, when applying a test load to the indenter, a compressive load is applied to the leaf spring for transmitting the generated force, so when the test load increases, the leaf spring buckles. Something happened. 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 undesirable because the sensitivity decreased.

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 for Solving the Problems] 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.

[Function] When the load of the load generating section 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. is pushed into the sample surface. At this time, a tensile load is applied to the leaf spring, so buckling or bending does not occur.

[Embodiment] FIG. 1 is a sectional view showing the configuration 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. This loading device 1 unbalances the electronic balance by supplying a load current to the electromagnetic coil 3 and applies a test load with 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 is arranged with 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, the lever 2
An electromagnetic force is generated that pulls the lever 21 upward, and a force that pushes down the other end of the lever 21 acts around a fulcrum 22 provided at the intermediate portion. The other end of the lever 21 is connected to the lower end of a leaf spring 23 provided in the vertical direction, and the upper end of this leaf spring is attached to a vertically movable holder 25 that holds the indenter 6.
It is connected to the connecting piece 24 of. In the load transmission mechanism configured in this manner, when the end of the load transmission lever 21 on the Nfa force generating section side is pulled up, the load transmission lever 21 rotates and pulls the leaf spring 23 downward, so that the connecting piece 24 is pulled up. The indenter holder 25 is pushed down through the indenter holder 25, 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 being 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 incorporated into the 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. 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 sample 7 can be brought closer together or moved to any desired 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. Further, 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, and the indenter's indentation accuracy can be improved. 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.

[Effects 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 that the test load is increased. This makes it possible to reduce the risk of damage.

[Brief explanation of drawings]

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. 1... Loading device 6... Indenter 21-- Load transmission lever 23-- Leaf spring 24-... Connection piece 2
5-...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 the load transmission lever a load generating section provided at one end and applying an upward load to the end; the end of the load transmission lever opposite to the load generating section is arranged above the end through a leaf spring; A loading device for an ultra-fine material testing machine, characterized in that it is connected to the indenter holder.