JPH0624760Y2 - Hardness tester - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] This invention is designed to automatically determine the type of the indenter when the indenter of the hardness tester is exchanged, and to input it to the scale display. Sa test machine.

[Conventional technology]

In the conventional hardness tester in which an indenter is pressed against a sample for measurement, the indenter 1 is a sample 4 by a load from a load device including an indenter lever 2 and a weight 3 as shown in FIG.
Is pressed, and the hardness of the sample 4 is measured from the load of the indenter 1 and the amount of penetration of the indenter 1 into the sample 4. In this case, by selecting the type of the indenter 1 according to the physical properties of the sample 4 and further determining the reference load and the test load, the scale to be converted according to the selected indenter and load is determined. . In this case, the standard load and the test load are usually displayed on the display device 5 at the same time when the tester is operated to apply the load to the indenter 1. The signal of each load thus made was input to the display device 5.

[Problems to be solved by the invention] By the way, in such a conventional hardness tester, the indenter is generally selected and attached manually, and the type of indenter is displayed. You can also type
The operator had to confirm the type of indenter and manually input it. Therefore, there is a problem that the type of the indenter is often input incorrectly, and an incorrect measured value is displayed and recorded. For example, there is a case where a 1/16 ″ steel ball indenter is mistakenly installed with the intention of installing a diamond indenter and input it to the scale part as a diamond indenter for measurement. Then, the converted value is different, so the wrong value Will be a serious problem.

The present invention has been made by paying attention to such a conventional problem, and provides a hardness tester that prevents the operator from mistakenly inputting the type of the indenter attached to the display device due to a mistake. The purpose is to obtain.

[Means for solving problems]

In order to achieve this object, according to the present invention, the structure is such that an indenter is attached to an indenter mounting portion, the indenter is pressed against a sample by a separately provided load device, and the indenter load and indenter sample are In the hardness tester that measures the hardness of the sample by inputting the amount of intrusion into the scale display unit, the indenter detection device provided in the indenter peripheral part and the signal from the indenter detection device An indenter discriminator for discriminating the type of the indenter is provided, and the information of the indenter type of the indenter discriminator is input to the scale display unit together with the information of the reference load and the test load.

[Action]

Next, the operation of the present invention will be described. Since the indenter detection device is provided in the peripheral portion of the indenter, a signal that can identify the indenter is determined by the type of the indenter attached to the indenter attachment portion. It is automatically generated from the detection device.
The signal from the indenter detection device is input to the indenter discriminator that discriminates the indenter type, and the indenter type information output from the indenter type is input to the scale display unit together with the reference load and test load information. .

〔Example〕

 An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a configuration diagram showing an embodiment of the present invention. In a hardness tester 10, an indenter 11 presses a sample 14 by a load from an indenter lever 12 composed of a weight 13 and a sample 14 to press the indenter 1.
The hardness of the sample 14 is measured from the load applied to No. 1 and the amount of penetration of the indenter 11 into the sample 14. Sample 1
4 is mounted on the sample table 15, a screw 16 is attached to the lower part of the sample table 15, and it can be moved up and down by a nut 17.

In this case, the type of the indenter 11 is selected according to the physical properties of the sample 14, and the reference load and the test load are determined. Although the indenter 11 is attached to the indenter mounting portion 20, the indenter 11 has a large diameter portion 1
8 is provided, and the diameter of the indenter large-diameter portion 18 differs depending on the type of the indenter 11, and the indenter 11 is determined by the diameter of the indenter large-diameter portion 18. That is, as shown in FIG. 2, in the peripheral portion of the indenter 11, a mounting plate 2 serving as an indenter detection device 21 is provided in a portion close to the side surface portion of the indenter large diameter portion 18.
2 and 23 are provided, and the light emitting element 24 is attached to the mounting plate 22.
A light receiving element 25 is arranged on the mounting plate 23 so as to face it. As shown in FIG. 3, the light receiving element 25 includes a large number of elements 2.
5a, 25b ... Are provided at the same position as the horizontal position of the indenter large diameter portion 18, and the light emitting element 24 is also provided with a large number of elements 24a, 24b. When the diameter of the indenter large-diameter portion 18 is large, all the light receiving elements 25 do not receive light, and when the diameter is slightly smaller, only the outer light receiving element 25a receives light and the other light receiving elements 5
As the light to b, 25c ... Is blocked and the diameter of the indenter large-diameter portion 18 becomes smaller, the inner light-receiving elements 25c, 25d come to receive light. That is, the range of light received by the light receiving element 25 changes according to the diameter of the indenter large-diameter portion 18, and the diameter of the indenter large-diameter portion 18 is detected. The diameter of the indenter large-diameter portion 18 is different depending on the type of the indenter 11, and the type of the indenter 11 and the indenter large-diameter portion 18 are made to correspond to each other 1: 1. The type of the indenter 11 is detected to detect the diameter of. The indenter detection device 21 is formed in this manner.

As shown in FIG. 4, there is provided an indenter discriminator 27 that discriminates the type of indenter based on a signal from the indenter discrimination detection device 21. Since the indenter discriminator 27 stores a predetermined relationship between the type of indenter and the number of detections of the light receiving element 25, the number of detections of the light receiving element 25 changes due to replacement of the indenter 11, and the detected number is stored. The type of indenter is discriminated by comparing it with the value. Next, indenter discriminator 27
A scale display unit 30 is provided for inputting the information of No. 2 together with the reference load and test load information 28 and 29. The scale display unit 30 receives the scale signal of the scale display unit 30 and the reference load and test load information 28 and 29. There is a measuring unit 31 for converting the hardness value by using a hardness display unit 33 for displaying the hardness value of the measuring unit 31.

A case of measuring hardness using this hardness tester will be described. The indenter 11 is a diamond indenter, 1/16 ″, 1 /
There are various types of steel ball indenters of 8 ″, 1/4 ″ and 1/2 ″, and one of them is selected and attached to the indenter mounting portion 20, but indenter 1
Since the difference in type 1 is the difference in diameter of the indenter large-diameter portion 18, some of the light-receiving elements 25 forming the indenter-discriminating detection device 21 receive light. The detection signal from the light receiving element 25 is the indenter discriminator 27.
Is compared with the stored value, and the type of the indenter 11 is determined by the number of detections of the light receiving element 25. The indenter type information from the indenter discriminator 27 is the reference load information 2 and the test load information 2.
8 and 29 are input to the scale display unit 30 and the scale determined by the input is displayed. After the test load is applied, the measuring unit 31 receives the scale signal from the scale display unit 30 to convert the hardness value, and the hardness display unit 33 displays the hardness value.

In this embodiment, the arrangement of the light receiving elements 25 in the indenter detection device 21 is set as shown in FIG.
As shown in the drawing, the positions of the light receiving elements 25 may be slightly changed to the left and the right, and the diameters of the indenter large diameter portion 18 may be detected.

Further, as shown in FIG. 6, there is also one in which the length of the shaft portion of the indenter is changed according to the type of the indenter, and this is detected to determine the type of the indenter. That is, the shaft portion 42 of the indenter 41 is adapted to be fitted into the cylindrical indenter mounting portion 43, but the cylindrical indenter mounting portion 43 is provided with the vertically long holes 44 and 45 as shown in the drawing. A light emitting element 46 is provided in the vicinity of the vertically long hole 44 of
Light-receiving elements 47 are vertically mounted near the other vertical hole 45, and the light-emitting element 46 and the light-receiving element 47 face each other. Therefore, since the length of the shaft portion 42 of the indenter 41 is different, the number of detections of the light receiving elements 47 is different, and the indenter 41 is different.
The type of can be determined.

Further, in order to detect the length of the shaft portion 42 of the indenter 41, the seventh
As shown in the figure, a large number of through holes 49 are provided in the cylindrical indenter mounting portion 48, and the light emitting element 46 and the light receiving element 47 are respectively mounted near the through holes 49 as in the case of FIG. Good. Further, as shown in FIG. 8, instead of vertically arranging the through holes as shown in FIG. 7 in the cylindrical indenter mounting portion 50, the through holes 51 are obliquely arranged, and in accordance therewith, the light emitting element and the light receiving element are arranged. 8 may be arranged, and in the case of FIG. 8, it becomes the same as the arrangement of the through holes 49 of FIG. 7 so densely that the through holes overlap each other. It is possible to detect a change in height, and it is possible to increase the number of types of indenters to be detected.

Incidentally, after the type of the indenter 41 is discriminated as the number of detections of the light receiving element 47, the subsequent processing can be similarly performed by the indenter discriminator 27 and the like in the same manner as the above-mentioned embodiment.

As described above, the types of the indenters 11 and 41 are detected in a non-contact state from the information such as the change in the diameter of the indenter large diameter portion 18 or the change in the length of the indenter shaft portion 42, and the indenter discriminator 27 determines the type. The information on the type of the indenter thus obtained is automatically converted on the scale display unit 30 and the correct value is displayed on the hardness display unit 33. Therefore, human error does not occur and correct measurement is always performed.

[Effect of device]

Since the present invention has the above-described configuration and operation, the type of the attached indenter will not be erroneously input to the display device due to an operator's mistake, and the type of indenter can be detected without contact. Since it is performed in a state and the signal of the type of the indenter is taken out without affecting the characteristics such as the pressing force of the indenter at all, a hardness tester capable of always performing a correct measurement can be obtained. Furthermore, since the signal of the indenter type is automatically input by the attachment of the indenter, the time required for measurement can be shortened.

Further, by connecting the device of the present invention to an automatic indenter exchange device, it is possible to perform hardness tests using multiple types of indenters, and to perform multiple types of hardness tests with one hardness tester. You can

[Brief description of drawings]

FIG. 1 is a side view showing a partial cross section of a hardness tester of an embodiment of the present invention, FIG. 2 is a cross sectional view of an indenter detection device, and FIG.
FIG. 4 is a side view of the light receiving element for indenter detection and the mounting plate, FIG. 4 is a block diagram showing the flow of signals from the indenter detection device,
FIG. 5 is a side view showing another embodiment of the light receiving element, FIG. 6 is a sectional view of another embodiment of the indenter detecting device, and FIG. 7 is a light emitting element of the indenter detecting device of FIG. And FIG. 8 is a sectional view of another embodiment of the light receiving element, FIG. 8 is a side view of another embodiment of the light receiving element of FIG. 7, and FIG. 9 is a partial cross section of a conventional hardness tester. FIG. 11 ... indenter 14 ... sample 20 ... indenter mounting part 21 ... indenter detection device 27 ... indenter discriminator 30 ... scale display section

Claims (1)

[Scope of utility model registration request] 1. An indenter is attached to an indenter mounting portion, the indenter is pressed against a sample by a separately provided load device, and the load of the indenter and the amount of indentation of the indenter into the sample are input to a scale display section. In a hardness tester that measures the hardness of the sample,
An indenter detection device provided in the indenter peripheral portion, and an indenter discriminator that discriminates the type of the indenter by a signal from the indenter discrimination detection device, and information of the indenter type of the indenter discriminator,
A hardness tester characterized by inputting information on a standard load and a test load into the scale display section.