JPS60114742A - Hardness tester - Google Patents

Abstract

PURPOSE:To set a load and a loading speed easily and as desired in a hardness test by connecting an electric rotary driving means to an indenter support through a reversing gear and speed reduction gear while a means of detecting a load applied on a sample by an indenter is provided. CONSTITUTION:A sample 23 is placed on a table 2a and a program memory 21 is specified for a main control section 12 from a keyboard 20. According to the program, a servomotor 16 is driven or controlled with a motor control section 15 or the like and a spindle 3 is lowered through a rotary motion-linear motion converting/speed reduction gear 19. The tip of the indenter 5 abbuts against the sample 23 on the table 2a. Additionally, a load applied is detected with a strain sensor 9 and inputted into the main control section 12 through a transducer 6 and an A/D converter 11 to be brought down to the reference load. After this condition is maintained for a specified time, a test load is applied and the depth of a pressure liquid is measured to determine the hardness, which is shown on a display 22.

Description

[Detailed description of the invention] (Shun 00 invention technology field The present invention is a rigid system that allows accurate load control. Regarding the test machine.

(b) Background of the technology Hardness testing is a test method that can determine the mechanical properties of a specimen by only slightly damaging it, and is indispensable at various manufacturing sites. It has been implemented.

(C), Conventional technology and problems Conventionally, hardness testers generally use a weight reduction method using a weight or a spring and a dashbot.
Therefore, the mechanism was very important and heavy, making it extremely inconvenient to handle. Moreover, if you try to change the loading speed of the load, you will need to change the characteristics of the dashpot, and if you change the load, you will also need to replace the weight, making it difficult for flexible use. It's often Il.

(d) Object of the Invention The present invention does not eliminate the above-mentioned drawbacks, and provides a small and lightweight hardness testing machine that allows easy setting and changing of load and loading speed. The purpose is to

(e) Configuration of the 0 invention, that is, the present invention is such that an indenter is attached to an indenter support provided to be movable in the vertical direction, and an electric rotation drive means is applied to the indenter support as a load source, and the rotation drive connected via a motion direction conversion/deceleration mechanism that decelerates the rotation of the means and converts the rotational motion into linear motion;
Furthermore, a load detection means for detecting the load applied to the sample from the indenter is provided.

(The following is a blank space) (f) 9 Examples of the Invention Examples of the present invention will be specifically described below based on FIG. jlIi.

FIG. 1 is a control block diagram showing an embodiment of a hardness tester according to the present invention, and FIG. 2 is a diagram showing an example of a load curve of the hardness tester.

As shown in FIG. 1, the hardness tester 1 has a main body 2 provided with a table 2n, and the main body 2 has a spindle 3 that is driven to move in the vertical direction in the figure, that is, in the directions of arrows A and B. It is set freely. An indenter 5 is attached to the lower end of the spindle 3, and a strain sensor 9 is further attached to the spindle 3.

Further, a gap sensor 7 is provided beside the indenter 5 at the lower end of the spindle 3, and a transducer 6.10 is connected to the strain sensor 9 and the gap sensor 7. An A/D converter 11 is connected to the transducer 6.10, and a main control section 12 composed of a microcomputer or the like is connected to the A/D converter 11. Main control part 1
A keyboard 20, a program memory 21, and a display 22 are connected to the 2, and a D/A converter 13 is also connected to the 2.
The motor control section 15 is connected via the. The motor control unit 15 includes a DC servo motor 16 and a servo motor 16.
A tacho generator 17 is connected to the servo motor 16 to detect the rotation angle amount e of the servo motor 16. The servo motor 16 is also connected to the spindle 3 through a motion direction conversion/deceleration mechanism 19, which is composed of gears, racks, pin-ons, etc., and which decelerates the rotation of the motor 16 and converts the rotational motion into linear motion. is connected, therefore, by rotating the servo motor 16 in the forward and reverse directions, the spindle 3
can move up and down in the figure.

Since the hardness tester 1 has the above configuration, when performing a Rockwell hardness test using the hardness tester 1, first place the sample 23 whose hardness is to be measured on the table 2a, and then place the sample 23 on the keybold 20. to the main control unit 12,
Commands the number PNO of the test program EPR used in the hardness test. The main control unit 12 searches the program memory 21 from the number PNO, reads the test program EPR corresponding to the number PNO, and reads the test program EPR corresponding to the number PNO.
According to P It, the servo motor 16 is drive-controlled via the E)/A converter 13 and the motor control unit 15 to perform a predetermined hardness test. That is, the program memory 21- stores a control pattern for the servo motor 16 corresponding to the load amount and the load application speed as a test program EPR' (and the control pattern corresponding to the load amount and load application speed to be tested is stored from the keyboard 20). The main control unit 12 can immediately perform the hardness test according to the specification of 1] by manually inputting the program number f) NO of the test 11 grams EPR.

After reading out the target test program EPR, the main control section 12 drives the servo motor 16 via the motor faJ943 section 15 and the like according to the program EPR, as described above. When the servo motor 16 is rotationally driven, the spindle 3 moves downward in FIG. The spindle 3 is driven until contact is made and the reference load Wl is further applied to the sample 23. That is, sample 23
The load applied to the spindle 3 is detected by a strain sensor 9 attached to the spindle 3 as strain generated in the spindle 3, and is input to the main control unit 12 via the transducer 6 and A/D conversion @11. The main control unit 12 calculates the load applied to the sample 23 via the indenter 5 from the amount of strain on the spindle 3, and lowers the spindle 3 in the entry direction until the load reaches the reference load W1. When the load applied from the indenter 5 to the sample 23 reaches the reference load W1, the C1 main control unit 12
is the motor control unit 15+, as shown in FIG.
of! command to enter a load maintenance operation to maintain the reference load riWl.

After the reference load W1 is maintained for a time of 1°1, the C1 main control unit 12 instructs the motor control unit 15 to enter the test/load operation of the load W2 based on the program E IJ tt. , the motor control unit 15 uses the program EPR
A predetermined test load W2 is applied to the sample 23 by moving the servo motor 16 to 11i1JNj according to the load speed shown in The output can be easily adjusted by controlling the drive motor 16 so that the output becomes a predetermined value.

After the test load W2 has been applied to the sample 23 as shown in FIG.
2, and then the servo motor 16 is reversed (B) to raise the spindle 3 in the direction B, and the load from the indenter 5 to the sample is returned to the initial reference load W1.

Incidentally, an indentation by the indenter 5 remains on the sample 23 on the table 2a, but since the spindle 3 is equipped with a gap sensor 7 that measures the distance between the spindle 3 and the sample, the AXB direction of the spindle 3 is The amount of movement, and therefore the depth of indentation of the indenter 5 into the sample 23, is determined by the transducer 10. Main control unit 12 via A/D conversion glue 11
It is calculated immediately by That is, the position of the spindle 3 at the time when the reference load w1 was applied and held for a time TJ was set as the reference origin ZP, the test load W2 was applied and held for a time 1゛2, and then it was returned to the reference tube MW1 again. If we set the position of the spindle 3 at that point in time with respect to the reference origin ZP, this is the movement of the spindle 3 in the entry direction! tilt
, tIJ + the depth of the indentation in sample 231, which is 1
．． j Tsukwell hardness will be displayed. The hardness determined in this way is displayed on the 1 display 22 J:.

When the hardness is determined, the spindle 3 is moved upward in the direction B, and the indenter 5 is moved away from the top of the sample 23.
The hardness test for the sample 23+ζ is completed.

In the above embodiment, the hardness tester 1 according to the present invention was used for a Rockwell hardness test, but the present invention also provides an electric indenter 5 such as a servo motor 16 as a load source. Of course, it can be used for any hardness test as long as it is configured to be moved and driven by a rotational drive means.

That is, it can also be used for indentation in Brinell hardness tests, Vickers hardness tests, etc.

(Margin (g) below) Effects of the Invention As explained above, according to the present invention, the indenter 5 is attached to the indenter support such as the spindle 3 which is provided to be movable in the vertical direction, and the indenter support Electric rotational drive means such as a servo motor 16 as a source of load on the body is controlled via a motion direction conversion/deceleration mechanism 19 that decelerates the rotation of the rotational drive means and converts the rotational motion into linear motion. A strain sensor 9 and a transducer 6 are connected to each other and further detect the load applied to the sample 23 from the indenter 5.
With this, it is possible to easily and arbitrarily set the load and loading speed of the load in the hardness test by controlling the rotation amount and rotation speed of the rotation drive means, and the hardness Testing machine 1 can be used flexibly.

Furthermore, since electric rotation drive means is used as the load loading source (means), the load loading is much faster than the conventional weaving load loading method using weights, dashpots, springs, etc. : It can be made lighter, smaller, and easier to handle.

[Brief explanation of the drawing]

FIG. 1 is a control block diagram showing an embodiment of the hardness tester according to the present invention, and FIG. 2 is a diagram showing an example of the load curve of the hardness tester. 1. Hardness tester ' 3... Indenter support (spindle) 5... Indenter 6... Thin detection means (transducer) 9... (1" Heavy detection means (strain sensor) 16...
Electric rotation drive means (servo motor) 19... Interlocking direction change/deceleration mechanism 23... Sample applicant Nishihara Public agent Patent attorney Phase 1) Oki 22 Procedures Amendment (Method) Commissioner of the Japan Patent Office Mr. Kazuo Wakasugi 1 Indication of the case Patent Application No. 223879 of 1983 2 Name of the invention Hardness tester 3 Relationship with the case by the person making the amendment Patent applicant address 800 Hatsutomi, Kamagaya City, Chiba Prefecture Name: Ko Nishihara 4 , Agent address: 3-12-21 Shimoai, Shinjuku-ku, Tokyo 161
Item 6 Full text of the specification subject to amendment 7 Contents of amendment

Claims (1)

[Scope of Claims] In a hardness tester that measures the hardness of a sample by pressing an indenter into the sample, the indenter is mounted on an indenter support provided vertically movably, and the indenter is inserted into the sample. An electric rotational drive means as a load source is connected to the support via a movement direction conversion/deceleration mechanism that decelerates the rotation of the rotational drive means and converts the rotational motion into linear motion, and further A hardness testing machine equipped with a load detection means to detect the load applied to the sample from the indenter.