JPH0620129Y2 - Hardness tester - Google Patents
Hardness testerInfo
- Publication number
- JPH0620129Y2 JPH0620129Y2 JP4779887U JP4779887U JPH0620129Y2 JP H0620129 Y2 JPH0620129 Y2 JP H0620129Y2 JP 4779887 U JP4779887 U JP 4779887U JP 4779887 U JP4779887 U JP 4779887U JP H0620129 Y2 JPH0620129 Y2 JP H0620129Y2
- Authority
- JP
- Japan
- Prior art keywords
- sample
- indenter
- hardness
- sample table
- normal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Landscapes
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Description
【考案の詳細な説明】 ［産業上の利用分野］ 本発明は、硬度計に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a hardness tester.
［従来の技術］ 微小硬度測定においては、ビッカース圧子又はヌーブ圧
子を用い、これに微小荷重を加えて試料台上に載置され
た試料表面にくぼみを形成し、該くぼみの対角線長を測
定して試料の微小硬度を求めている。[Prior Art] In microhardness measurement, a Vickers indenter or Knob indenter is used, a minute load is applied to this to form a dent on the surface of a sample placed on a sample table, and the diagonal length of the dent is measured. To obtain the micro hardness of the sample.
この場合、正確な硬度測定を行なうには圧子軸心を試料
面法線と一致するように調整することが重要であり、こ
の圧子軸心と試料面法線の傾きの許容範囲は、例えばヌ
ーブ硬度測定において0.5°以内と規定されている。(JI
SZ-2251)。In this case, in order to perform accurate hardness measurement, it is important to adjust the indenter axis so that it coincides with the sample surface normal, and the allowable range of inclination between this indenter axis and the sample surface normal is It is specified within 0.5 ° in hardness measurement. (JI
SZ-2251).
［考案が解決しようとする問題点］ ヌーブ硬度測定においては、対角線長さを測定する方向
の対陵角が172°30′と直線（180°）に近いため、圧子
軸心と試料面法線との角度のズレが直線対角線長さの測
定に影響し、測定誤差を生じる原因となっている。上記
したようにヌーブ硬度測定では、該角度のズレの許容範
囲が0.5°以下と規定されており、圧子の軸心と試料面
法線の傾きをこの許容範囲内になるように調整すること
は、微妙な調整作業を要し、その調整如何が直接測定精
度を左右することから特にヌーブ試験を困難なものにし
ていた。また、試料表面のうねりや組織の変化のために
研磨面の凹凸があるものでは、測定点ごとに角度調節が
必要とされ、硬度測定が非効率的になるという問題点が
あった。[Problems to be solved by the device] In Knuve hardness measurement, the diagonal angle in the direction of diagonal length measurement is 172 ° 30 ', which is close to a straight line (180 °). The deviation of the angle between and affects the measurement of the length of the diagonal line, which causes a measurement error. As described above, in the Knube hardness measurement, the allowable range of deviation of the angle is specified to be 0.5 ° or less, and it is not possible to adjust the inclination of the axial center of the indenter and the normal to the sample surface to be within this allowable range. However, since the delicate adjustment work is required and the adjustment accuracy directly affects the measurement accuracy, the Neuve test is particularly difficult. Further, in the case where the polishing surface has irregularities due to the waviness of the sample surface or the change of the structure, it is necessary to adjust the angle at each measurement point, which causes a problem that the hardness measurement becomes inefficient.
そこで本考案は、圧子の軸心と試料面法線のズレを短時
間にかつ自動的に規定値以下に調整できる硬度計を提供
することを目的とする。Therefore, an object of the present invention is to provide a hardness tester capable of automatically adjusting the deviation between the axis of the indenter and the normal to the sample surface to a specified value or less in a short time.
［問題点を解決するための手段］ 上記問題点を解決するため次のような構成を採用した。[Means for Solving Problems] In order to solve the above problems, the following configuration is adopted.
すなわち、本考案にかかる硬度計は、試料上に載置され
た試料に圧子を押し込み、試料に生じたくぼみの大きさ
を測定して試料の硬度を求める硬度計において、試料台
の一端を水平軸回りに回転可能に支持する手段と、試料
台の他端を上下に昇降可能に支持する昇降手段と、くぼ
みの形状を画像処理する手段と、このくぼみの画像から
圧子軸心と試料表面の法線がなす角度を検出する制御手
段とを備え、前記制御手段で前記昇降手段を制御するこ
とを特徴としている。That is, in the hardness meter according to the present invention, the indenter is pushed into the sample placed on the sample, and the hardness of the sample is measured by measuring the size of the indentation formed in the sample, and one end of the sample table is set horizontally. A means for rotatably supporting the shaft, an elevating means for vertically moving the other end of the sample stand, a means for image-processing the shape of the indentation, and an image of the indentation for indenter axis and sample surface And a control means for detecting an angle formed by the normal, and the control means controls the elevating means.
［作用］ 試料台の一端が水平軸回りに回転するように軸支され、
他端が昇降手段によって上下に昇降自在に保持されてい
るので、圧子側を調整することなく、試料台の端部を上
下させることで試料台表面の角度が調節できる。しか
も、圧子によって形成した試料表面のくぼみ形状を画像
処理する手段を備えているので、くぼみの中心から各頂
点までの距離を測定して圧子軸心と試料面法線との傾き
のズレを検出でき、このズレが許容値を越える場合は、
制御手段によって昇降手段を駆動し試料台を昇降するこ
とにより、圧子軸心と試料面法線との傾きを規定値以下
に自動的に調整できる。[Operation] One end of the sample table is pivotally supported so as to rotate around the horizontal axis,
Since the other end is held by the elevating means so as to be able to move up and down, the angle of the sample table surface can be adjusted by moving the end of the sample table up and down without adjusting the indenter side. In addition, because it is equipped with a means to image-process the dent shape of the sample surface formed by the indenter, the distance from the center of the dent to each apex is measured to detect the deviation between the indenter axis and the sample surface normal. Yes, if this deviation exceeds the allowable value,
By driving the elevating means by the control means to elevate the sample table, the inclination between the indenter axis and the normal to the sample surface can be automatically adjusted to a specified value or less.
［実施例］ 第１図は本考案の実施例の構成を示す図で、試料台１
は、その一端部２に回転軸３が設けられ水平軸回りに回
転可能に軸支されている。試料台１の他端５にはパルス
モータ８によって回転するねじ棹７に螺合するナット板
６が設けられている。パルスモータ８を駆動することに
よって駆動パルス数に応じてねじ棹７が回転し、その回
転ピッチに応じてナット板６が上下し、試料台１の端部
５が昇降する。[Embodiment] FIG. 1 is a view showing the arrangement of an embodiment of the present invention, which is a sample table 1
A rotary shaft 3 is provided at one end portion 2 thereof and is rotatably supported around a horizontal axis. The other end 5 of the sample table 1 is provided with a nut plate 6 screwed into a screw rod 7 rotated by a pulse motor 8. By driving the pulse motor 8, the screw rod 7 rotates according to the number of drive pulses, the nut plate 6 moves up and down according to the rotation pitch, and the end 5 of the sample stand 1 moves up and down.
また、試料台１に載置された試料10には、微小硬度計本
体側に設けた圧子12が押し込まれる。試料表面に形成さ
れたくぼみは、圧子12と切換的に試料上に配置される光
学系13によって観察される。光学系13によって採取され
た試料10表面の画像はＣＰＵ15を介して画像処理装置16
に入力される。Further, the indenter 12 provided on the main body of the micro hardness tester is pushed into the sample 10 placed on the sample table 1. The indentation formed on the sample surface is observed by the indenter 12 and the optical system 13 arranged on the sample in an alternating manner. The image of the surface of the sample 10 collected by the optical system 13 is processed by the image processing device 16 via the CPU 15.
Entered in.
画像処理装置16は、第２図に示すように試料表面に形成
されたくぼみ画像から、対角線長さ１′と対角中心から
対角点までのそれぞれの距離11′，12′を算出するとと
もに、11′と12′の比11′/12′も算出する。The image processing device 16 calculates the diagonal length 1 ′ and the respective distances 1 1 ′ and 1 2 ′ from the diagonal center to the diagonal point from the hollow image formed on the sample surface as shown in FIG. as well as, also calculated 1 1 'and 1 2' ratio 1 1 '/ 1 2'.
同図(a)は圧子軸心と試料面法線のズレがない場合の正
常なくぼみ形状を示し(b)は試料が傾いている時のくぼ
み形状を示す。例えば正常なくぼみ形状のときは距離11
と12の比は１となるが、圧子軸心と試料面法線のズレが
0.5°の時にはこの比11/12や約1.268となる。ビッカー
ス圧子の場合は対陵角２°以下が規定値であって、これ
に対応する11/12の値は約1.303になる。The figure (a) shows the normal concave shape when there is no deviation between the indenter axis and the sample surface normal, and (b) shows the concave shape when the sample is tilted. For example, the distance is 1 1 when the shape is normal.
When 1 2 ratio is a 1, the displacement of the indenter axis and the specimen surface normal is
When the 0.5 ° becomes the ratio 1 1/1 2 and about 1.268. For Vickers indenter a 2 ° or less pairs ridge angle specified value, 1 1/1 2 value corresponding thereto is about 1.303.
したがって、この比11′/12′をチェックすることによ
り問題となるズレが規定範囲以内にあるか否かが判定で
きる。そこで、11′/12′を画像処理装置16によって求
め、この値を比較回路17へ入力させ、あらかじめ設定さ
れた許容範囲を示す設定値と比較させている。比較回路
17には、上記したように例えばヌーブ圧子の場合は比11
/12の許容値を1.268、ビッカース圧子の場合は1.303と
してあらかじめ設定されており、これら設定値と画像処
理装置16から入力される11′/12′の値を比較し、設定
値を越える時はＣＰＵ15に信号が出力される。Therefore, whether or not shift in question by checking the ratio 1 1 '/ 1 2' is within the prescribed range can be determined. Therefore, 1 1 ′ / 12 2 ′ is obtained by the image processing device 16, and this value is input to the comparison circuit 17 to be compared with a preset value indicating the allowable range. Comparison circuit
As described above, in the case of the Neuve indenter, the ratio 1
The permissible value of / 1 2 is preset as 1.268, and in the case of Vickers indenter it is set as 1.303.Compare these set values with the 1 1 ′ / 1 2 ′ value input from the image processing device 16, and set the set value. When it exceeds, a signal is output to the CPU 15.
ＣＰＵ15はこの信号によりパルスモータ８の駆動信号を
出力して、11′/12′の値が設定値を越えないように試
料台１の端部５を昇降して試料台１の傾き角度を調節す
る。The CPU 15 outputs a drive signal for the pulse motor 8 based on this signal, and moves up and down the end 5 of the sample table 1 so that the value of 1 1 ′ / 12 2 ′ does not exceed the set value. Adjust.
このように試料台側の傾きを角度を調節して圧子の軸心
と試料面法線とのズレを規定値以下に調節するので、短
時間に自動的に調整することができる。In this way, the inclination of the sample table side is adjusted by adjusting the angle to adjust the deviation between the axial center of the indenter and the sample surface normal to the specified value or less, so that the adjustment can be automatically performed in a short time.
［考案の効果］ 上記説明から明らかなように、本考案にかかる硬度計に
よれば、圧子軸心と試料表面の法線がなす角度を検出
し、この角度が許容範囲以下にない場合には、制御手段
により昇降手段を制御して試料台の傾きを調節できるの
で、試料面法線と圧子軸心とのズレを自動的に正確に規
定値以下に調整でき、硬度測定精度の向上を図ることが
できるようになった。[Effect of the Invention] As is apparent from the above description, the hardness meter according to the present invention detects the angle formed by the indenter axis and the normal line to the sample surface, and when this angle is not within the allowable range, Since the control means can control the elevating means to adjust the tilt of the sample table, the deviation between the normal to the sample surface and the indenter axis can be automatically and accurately adjusted to the specified value or less, and the hardness measurement accuracy is improved. I was able to do it.
第１図は本考案の実施例の構成を示す図、第２図(a),
(b)は圧子の圧痕画像を示す図である。 １…試料台、３…回転軸、６…ナット板、７…ねじ棹、
８…パルスモータFIG. 1 is a diagram showing the configuration of an embodiment of the present invention, and FIG. 2 (a),
(b) is a figure which shows the indentation image of an indenter. 1 ... Sample stand, 3 ... Rotating shaft, 6 ... Nut plate, 7 ... Screw rod,
8 ... Pulse motor
Claims (1)
み、試料に生じたくぼみの大きさを測定して試料の硬度
を求める硬度計において、試料台の一端を水平軸回りに
回転可能に支持する手段と、試料台の他端を上下に昇降
可能に支持する昇降手段と、くぼみの形状を画像処理す
る手段と、このくぼみの画像から圧子軸心と試料表面の
法線がなす角度を検出する制御手段とを備え、前記制御
手段で前記昇降手段を制御することを特徴とする硬度
計。1. A hardness meter that presses an indenter into a sample placed on the sample table to measure the size of a recess formed in the sample to determine the hardness of the sample. One end of the sample table is rotated around a horizontal axis. Means for supporting the sample table, lifting means for vertically lifting the other end of the sample table, means for image-processing the shape of the dent, and the image of the dent forms the indenter axis and the normal to the sample surface. A hardness meter comprising: a control unit for detecting an angle, wherein the control unit controls the elevating unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4779887U JPH0620129Y2 (en) | 1987-03-30 | 1987-03-30 | Hardness tester |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4779887U JPH0620129Y2 (en) | 1987-03-30 | 1987-03-30 | Hardness tester |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63155050U JPS63155050U (en) | 1988-10-12 |
| JPH0620129Y2 true JPH0620129Y2 (en) | 1994-05-25 |
Family
ID=30868745
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4779887U Expired - Lifetime JPH0620129Y2 (en) | 1987-03-30 | 1987-03-30 | Hardness tester |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0620129Y2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008122164A (en) * | 2006-11-09 | 2008-05-29 | Niigata Univ | Single sensor indentation test system |
| CN116499908A (en) * | 2023-05-17 | 2023-07-28 | 安徽聚锦精密科技有限公司 | A metal material surface hardness testing equipment |
-
1987
- 1987-03-30 JP JP4779887U patent/JPH0620129Y2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63155050U (en) | 1988-10-12 |
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