JPH0545964Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Industrial application field] This invention relates to a loading device for a microhardness tester.

[Prior Art] Microhardness meters are widely used, which include an indenter, a loading device that applies a predetermined test load to the indenter, and an optical device that observes the test surface. In this type of microhardness meter, when changing the test load, the weight must be manually removed from the testing machine and replaced.

[Problems to be solved by the invention] However, as with the loading device of the conventional microhardness tester mentioned above, it is generally inefficient to manually replace the weight every time the test load is changed, and the weight There was a problem that management was cumbersome. In addition, there was a high possibility that the weight would be lost during handling, or that it would corrode due to manual contact.

The purpose of the present invention is to incorporate a plurality of weights into the main body of the hardness tester, and to make it possible to appropriately select these weights to switch the test load.

[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 microhardness tester according to the present invention has a U-shaped cross section, and has a plurality of weights of different sizes with a through hole in the center, and a small weight inside the large weight. The weights are sequentially fitted and stacked one on top of the other, and a vertically movable shaft capable of lifting the weights is inserted into the through hole of the plurality of stacked weights, and the lower side of the weights is inserted. The apparatus is characterized in that it is provided with a pair of receiving plates that can approach and separate from each other around the axis and that support a weight located thereon.

[Function] When changing the test load, lift the entire weight on the shaft,
When a pair of receiving plates is moved to a position where a predetermined load value is obtained and the weight is lowered, the weight located on the receiving plate is supported by the receiving plate, and the corresponding load is not applied to the indenter. It disappears. Any test load can be obtained by adjusting the moving position of this receiving plate.

[Examples] Examples shown in the drawings will be described below.

This microhardness meter 1 consists of a base 5 provided with an elevating handle 3 for raising and lowering the sample stage 2, and a measuring section 9 supported by a column 7 erected on the base. The sample stage 2 has a micrometer head 8,
A stage 10 that moves back and forth and left and right is attached by 8', and a sample is mounted on this stage 10.

The measurement unit 9 is provided with a loading device A and an optical device B.

The loading device A includes a plurality of large and small weights 15, 15a,
15b,... The weights 15 are formed into a cylindrical shape that opens downward, and have a through hole 16 bored in the core, and are stacked one on top of the other with smaller weights sequentially fitted inside the larger weight. .

A hollow shaft 20 is inserted through a through hole 16 in the core of the stacked bowl-shaped weights 15, 15, .
Flange-like protrusions 21 and 22 are formed on the outer circumference of the hollow shaft 20 at two upper and lower locations, and a telescoping tube 23 for size adjustment is screwed onto the lower end. The protrusion 22 on the lower side of the hollow shaft 20 engages with the inside of the innermost weight 15h.

In the illustrated example, the weight has a cylindrical shape, but it may also have a prismatic shape. Further, the weight can be made into a U-shaped frame having a certain width, and the frames can be stacked on top of each other. In this case as well, the through hole 16 can be bored in the center.

The lower end of the hollow shaft 20 is located on the upper end flange 25a of the load transmission shaft 25, and is placed on the load transmission shaft 25 when a load is applied. This load transmission shaft 25 is slidably fitted into a guide hole 28 provided in a load case 27, and has a conical tip 25a formed at its lower end.

An indenter holder 29 that holds an indenter 30 is provided below the load transmission shaft 25 . Indenter holder 2
9 is attached to one tip of a lever 33 that is supported to be vertically rotatable by a fulcrum 32 provided on the load case 27, and a pin 34 is attached to the opposite end of the lever 33 in a horizontal direction. It is installed protrudingly.
A rotating arm 37 pivotally connected to the load case 27 via a shaft 36 comes into contact with this pin 34 .

The load case 27, which is generally U-shaped when viewed from the side, is rotatable within a predetermined angular range within a horizontal plane by a support shaft 43 on the main case 9a side that is supported by bearings 41, 41 in a bearing hole 40 provided at the center thereof. Supported. A measurement objective lens 45 and an observation objective lens 46 are provided on the lower surface side of the load case 27 at positions concentric with the indenter holder 29 and sandwiching the indenter holder.By rotating the load case 27, both lenses can be removed. 45 and 46 can be positioned at the position of the indenter holder shown in the figure, that is, at the test position directly below the hollow shaft 20. Note that the load case 27 is provided with a micro switch 35 for detecting its position.

The support shaft 43 is formed as a hollow shaft having a through hole in its core, and is attached to the machine frame 50 in the main body case 9a.
is attached to. A transmission shaft 52 of the load removal device C is slidably fitted into the through hole of the support shaft 43, and the transmission shaft 52 is urged upward by a spring 53. A ball is fitted to the lower end of the transmission shaft 52, and the ball comes into contact with the upper surface of the rotating arm 37.

A ball similar to the lower end of the transmission shaft 52 is fitted at the upper end, and the tip of a rotating body 55, which has a hook shape in side view, is in contact with the upper end. The rotating body 55 is rotatably supported by a shaft 56, and an eccentric cam 57 is in contact with the back surface of the rising portion 55a.

Eccentric cam 57 is mounted on a rotating shaft 60 supported by bearings 59, 59'. A pair of rotary plates 62, 62' are attached to the rotary shaft 60, and a pawl 63 is protruded from the rotary plate at a position eccentric to the rotary shaft.

Rotational power of a motor 67 is transmitted to the rotating shaft 60 via a pulley and a belt 65. When the rotating shaft 60 rotates and the long diameter portion of the eccentric cam 57 presses the rising portion of the rotating body 55, the rotating body rotates and its horizontal portion 55b pushes the transmission shaft 52 downward. Therefore, the rotating arm 37 rotates downward and presses the rear end of the lever 33, so the lever 33 rotates about the fulcrum 32 and the indenter holder 29 is lifted. When the short diameter portion of the eccentric cam 57 is in contact with the rotating body 55, the indenter holder 29 is in a lowered state.

A weight cover 69 is provided above the weight 15, and the upper end of the hollow shaft 20 protrudes above the weight cover, and a pair of shafts 70, 70' are arranged to sandwich the hollow shaft. They are installed in parallel. The shafts 70, 70' are rotatably supported, and engaging members 71 are provided on both sides of the hollow pipe 20 in the middle thereof to engage with the upper protrusion 21 of the hollow pipe from below. There is. shaft 70,
The claws 6 of the rotary plates 62, 62' are located at the rear end of the rotary plate 70'.
3 is provided with an arm 73 in contact with the arm 73,
The shafts 70, 70' are connected to the hollow shaft 20 by the engaging member 71.
A spring 74 is provided that biases the upper protrusion 21 so that the upper protrusion 21 is not engaged with the lower protrusion 21 . The rotating shaft 60 rotates, and the claws 63, 6 of the rotating plates 62, 62'
3 presses the arms 73, 73, respectively, the shafts 70, 70' rotate against the tension of the springs 74, 74, and the engaging member 71 presses the upper protrusion 21 of the hollow shaft 20.
Since the hollow shaft 20, which is normally placed on the load transmission shaft 25, moves upward while lifting the weight group. Therefore, no load is applied to the indenter. The shafts 70, 70', the engaging member 71, the arm 73, the spring 74, etc. constitute a load lifting device D that temporarily suspends the load function of the weight.

Note that since the rotating plates 62, 62' and the eccentric cam 57 are attached to the common rotating shaft 60, the load adding/removing device C and the load lifting device D are interlocked with each other, and when the indenter 30 is lifted, the The weight is also lifted at the same time.

This loading device A is provided with a load switching device E for switching the magnitude of the load applied to the indenter 30. The load switching device E includes a pair of receiving plates 77, 77 that move back and forth to support the loads under the stacked load groups 15, . . . . The receiving plate 77 has a curved notch 78 formed in the center along the outer circumference of the cylindrical load 15, and both ends are fixed to nut members 80, 80.
The nut members 80, 80 are screwed into a pair of threaded rods 81, 81 having threads in opposite directions on both sides of the center. When both the threaded rods 81, 81 are simultaneously rotated in the same direction by the rotational power transmitted from the drive motor 83 via the belts 84, 84', the nut members 80, . The receiving plates 77, 77 are the motor 83
move toward or away from each other depending on the direction of rotation. a pair of receiving plates 77,
77 move toward each other, that is, toward the hollow shaft 20 that suspends the load, the number of weights supported by the receiving plates 77 increases when the hollow shaft 20 descends, and the load is applied to the indenter 30. The applied load value becomes smaller. Conversely, when the receiving plates 77, 77 move away from each other, the weight located in the center is no longer supported, so the load applied to the indenter 30 increases. When the receiving plates 77, 77 move to the outermost positions, all the weights become free and the maximum load (for example, 2000 grf) is applied to the indenter 30. In addition, when the receiving plates 77, 77 are closest to each other, all the weights up to the smallest weight 15h are supported by the receiving plates, so only the weight of the hollow shaft 20 is loaded on the load transmission shaft 25. will be done. That is, the hollow shaft 20 itself acts as a weight. The indenter 30 also has an indenter holder 2.
9. Since the weight of the load transmission shaft 25, lever 33, etc. is also added, these also constitute one of the separately provided weights. In this case, it is preferable that the sum of the weight of the hollow shaft 20 and the weight of the indenter holder 29, etc. be lighter than the weight of the minimum weight 15h.
For example, if the minimum test load is 5 g, the load of the indenter holder 29, load transmission shaft 25, lever 33, etc. should be 5 g, and the weight of the hollow shaft 20 should be 5 g. Since the weight of the weight group is applied to the hollow shaft 20, it must have sufficient strength to support the weight. Therefore, it is preferable that the hollow shaft 20 be made of a light alloy or the like.
In this loading device, for example, the load range is 5~
It is also possible to switch 11 steps at 2000grf.

Note that the threaded rods 81, 81 for changing the load may be provided with knobs and turned manually instead of using the power of a motor.

Next, optical device B will be explained. This microhardness meter is provided with a pipe 90 serving as an optical path in the front-rear direction, and a lamp 91 serving as a light source is provided at the rear end. A half mirror 93 is attached to the front end of a pipe 90 passing through the upper part of the loading device A, and a prism 95 is disposed above the half mirror 93. The front end of the prism 95 faces an optical path tube 99 of a measuring instrument 98 to which an eyepiece 97 is attached.

A hollow shaft 20 is provided directly below the half mirror 93.
are located so that the optical axes to the objective lenses 45 and 46 pass through the hollow shaft 20. light source 9
The illumination light from 1 passes through the pipe 90 and the half mirror 93 along the optical axis L, and is guided to the specimen surface along the optical axis M inside the hollow shaft 20. Further, the reflected light from the surface of the specimen passes from the objective lenses 45 and 46 through the optical axis M of the hollow shaft 20, passes through the half mirror 93, and reaches the prism 95. Then, it is bent and guided to the eyepiece lens 97 along the optical axis S.

If you explain how to use this microhardness tester,
First, the test piece, which is the specimen, is placed on stage 1 of sample stage 2.
0, adjust the vertical position with the handle 3, and select the test location by operating the micrometer heads 8, 8'. At this time, the observation objective lens 46 is positioned directly below the hollow shaft 20.

After determining the test location, the load case 27 is rotated to set the indenter 30 at the test position directly below the hollow shaft 20. At this time, the load adding/removing device C is operated in advance to rotate the rotating body 55 downward by the long diameter portion of the eccentric cam 57, and the transmission shaft 52 is pushed down to lift the indenter from the surface of the test piece. Since the load adding/removing device C and the load lifting device D are designed to interlock with each other, in this state, the hollow shaft 20 moves upward to lift and support the group of weights.

Next, the load switching device E is driven so that the load applied to the indenter becomes a desired load. After that, when the load adding/removing device C and the load lifting device D are released, the loads of the weights 15, ... are transferred to the hollow shaft 2.
0, the force is transmitted to the force application point 25a of the indenter holder 29 via the load transmission shaft 25, and the indenter 30 is pushed into the test surface.

When the pressing of the indenter is completed, the load adding/removing device C and the load lifting device D are operated again to lift the indenter 30 and the weight 15, etc., and the load case 27 is rotated to position the objective lens 46 at the test position. While observing the image of the indentation with an eyepiece 97, the size of the indentation is measured with a measuring device 98.

[Effects of the invention] As is clear from the above explanation, the loading device according to the invention allows multiple weights of different sizes to be compactly stored within the main body of the hardness tester, and also allows the weight to be directly attached to the weight by hand. It is now possible to select the desired test load without touching the Although the illustrated example shows a cylindrical weight, the outer shape of the weight can be any shape such as a circle or a polygon.

[Brief explanation of the drawing]

Fig. 1 is an external view of a microhardness tester representing an embodiment of the present invention, Fig. 2 is a side sectional view thereof, Fig. 3 is a sectional view of its indenter holder, Fig. 4 is a plan view of the measuring section, and Fig. 5 The figure is its front view. DESCRIPTION OF SYMBOLS 1...Microhardness meter, 9...Measurement part, 15... Weight, 20... Hollow shaft, 25... Load transmission shaft, 29
...Indenter holder, 30...Indenter, 33...Lever, 45, 46...Objective lens, 77...Receiver plate,
97...Eyepiece lens, A...Loading device, B...Optical device.

Claims (1)

[Scope of utility model registration request] A plurality of weights of different sizes, which are formed into a U-shape in cross section and have a through hole in the center, are stacked one on top of the other with smaller weights sequentially fitted inside the larger weight, and A vertically movable shaft capable of lifting the plurality of weights is inserted into the through hole of the plurality of superimposed weights, and the lower side of the plurality of weights is capable of approaching and separating from each other around the axis, A loading device for a microhardness tester, characterized in that a pair of receiving plates are provided to support a weight positioned above the receiving plate.