JPH11118691A - Calibration method for automatic indentation reader - Google Patents

Calibration method for automatic indentation reader

Info

Publication number
JPH11118691A
JPH11118691A JP29945397A JP29945397A JPH11118691A JP H11118691 A JPH11118691 A JP H11118691A JP 29945397 A JP29945397 A JP 29945397A JP 29945397 A JP29945397 A JP 29945397A JP H11118691 A JPH11118691 A JP H11118691A
Authority
JP
Japan
Prior art keywords
indentation
automatic
reading
indentations
diagonal length
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.)
Pending
Application number
JP29945397A
Other languages
Japanese (ja)
Inventor
Masaharu Tsujii
正治 辻井
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Akashi Corp
Original Assignee
Akashi Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Akashi Corp filed Critical Akashi Corp
Priority to JP29945397A priority Critical patent/JPH11118691A/en
Publication of JPH11118691A publication Critical patent/JPH11118691A/en
Pending legal-status Critical Current

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Abstract

PROBLEM TO BE SOLVED: To improve the accuracy in measuring the hardness of a test piece based on a read value of the diagonal length of an indentation formed in the test piece. SOLUTION: Four indentations with diagonal lengths of D1 =25 μm, D2 =50 μm, D3 =75 μm and D4 =100 μm are formed in a test piece varying a test load. A computer computes a function of Hv=f(D) indicating the relationship of an indicated value Hv and the diagonal length D based on the individual diagonal lengths D1 -D4 of indentations and indicated values a-d of an automatic indentation reader corresponding thereto to calibrate read values of the indentations by the function thus obtained thereby enabling higher accuracy of a hardness tester.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】本発明は、ビッカース硬さ試
験機やブリネル硬さ試験機などに付設されて、試験機の
圧子により試料に形成された圧痕の対角線長さを読取っ
て当該試料の硬さを表示する圧痕自動読取り装置に関
し、特にその校正方法に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a Vickers hardness tester, a Brinell hardness tester, or the like, which reads the diagonal length of an indentation formed on a sample by an indenter of the tester and reads the hardness of the sample. The present invention relates to an automatic indentation reading device for displaying the indentation, and particularly to a calibration method thereof.

【0002】[0002]

【従来の技術】従来、ビッカース硬さ試験機に付設され
た圧痕自動読取り装置の校正は、次のようにして行なわ
れている。
2. Description of the Related Art Conventionally, calibration of an automatic indentation reading device attached to a Vickers hardness tester is performed as follows.

【0003】すなわち、例えばビッカース硬さHv=5
00の基準硬さを有するテストピースに形成された圧痕
(なおこの圧痕は試験荷重wで圧子をテストピースに押
し付けて予め形成されている)の対角線長さD(図2の
例では50ミクロン)を自動読取り装置で読取らせ、読
取り値が50ミクロンのとき硬さ値としてHv500が
表示されるように、すなわち読取り値Dに対応する硬さ
としてHv500を表示するように圧痕自動読取り装置
の校正を行なっている。また、ブリネル硬さ試験機の自
動読取り装置の校正も上記と同じ要領で行なわれてい
る。
That is, for example, Vickers hardness Hv = 5
Diagonal length D (50 microns in the example of FIG. 2) of an indentation formed on a test piece having a reference hardness of 00 (the indentation is formed in advance by pressing an indenter against the test piece with a test load w). Is read by an automatic reader, and when the read value is 50 microns, Hv500 is displayed as a hardness value, that is, Hv500 is displayed as hardness corresponding to the read value D. Calibration of the automatic indentation reader Are doing. The calibration of the automatic reading device of the Brinell hardness tester is performed in the same manner as described above.

【0004】[0004]

【発明が解決しようとする課題】このように、従来の圧
痕自動読取り装置の校正では、校正ポイントを、例えば
圧痕の対角線長さD=50ミクロンの1点で行ない、そ
のほかの圧痕寸法については類推適用した所謂1点式
(これを図示すると図2のようになる)であるため、試
料硬さが校正ポイント付近の硬さの場合は読取り誤差は
少ないが、校正ポイントから離れたポイント(例えばD
=100ミクロン)での硬さ値は読取り誤差が多くなる
というおそれがある。本発明は、このような問題点を解
決しようとするものである。
As described above, in the calibration of the conventional indentation automatic reading apparatus, the calibration point is performed at one point, for example, at a diagonal length D of the indentation of D = 50 microns, and other indentation dimensions are analogized. Since this is a so-called one-point method (shown in FIG. 2 when this is illustrated), a reading error is small when the sample hardness is close to the calibration point, but a point far from the calibration point (for example, D
(= 100 microns) can lead to increased reading errors. The present invention is intended to solve such a problem.

【0005】[0005]

【課題を解決するための手段】本発明は、対角線長さD
の圧痕を形成された硬さHのテストピースの上記圧痕の
対角線長さの読取り値に対応する硬さとしてHを表示す
るように自動読取り装置を校正する校正方法において、
上記校正を、上記テストピースに形成された対角線長さ
の異なる複数の圧痕を対象として行なうようにして課題
解決の手段としている。
SUMMARY OF THE INVENTION The present invention provides a diagonal length D
A calibration method for calibrating an automatic reader so as to display H as hardness corresponding to a read value of the diagonal length of the indentation of a test piece having hardness H formed with indentations,
The calibration is performed on a plurality of indentations having different diagonal lengths formed on the test piece as a means for solving the problem.

【0006】また、上記テストピースに形成された対角
線長さの異なる複数の圧痕の各対角線長さを読取らせる
とともに、各対角線長さと、同各対角線長さに対応した
各硬さ表示値とに基づいて、当該圧痕自動読取り装置の
固有読取り特性を同自動読取り装置に内蔵したマイクロ
コンピュータにおいて演算し、同固有読取り特性を上記
マイクロコンピュータのメモリ部に記憶させて課題解決
の手段としている。
In addition, each diagonal length of a plurality of indentations having different diagonal lengths formed on the test piece is read, and each diagonal length and each hardness display value corresponding to each diagonal length are read. On the basis of the above, an inherent reading characteristic of the indentation automatic reading apparatus is calculated by a microcomputer built in the automatic reading apparatus, and the inherent reading characteristic is stored in a memory section of the microcomputer to solve the problem.

【0007】さらに、上記固有読取り特性を函数 H=
f(D) としてマイクロコンピュータで演算するよう
にして課題解決の手段としている。
Further, the characteristic reading characteristic is calculated by a function H =
f (D) is calculated by a microcomputer as means for solving the problem.

【0008】本発明では、校正ポイントが複数(2カ所
以上)となるため、従来の1点式校正方法に比べて圧痕
自動読取り装置の校正精度が向上する。
In the present invention, since the number of calibration points is plural (two or more), the calibration accuracy of the automatic indentation reading device is improved as compared with the conventional one-point calibration method.

【0009】また、対角線長さの異なる複数の圧痕の各
対角線長さと、同各圧痕に対応する各硬さ表示値とに基
づいて、当該圧痕自動読取り装置の固有読取り特性を自
動読取り装置に内蔵したマイクロコンピュータで演算す
るとともに、同固有読取り特性を上記マイクロコンピュ
ータのメモリ部に記憶させておき、このメモリ部に記憶
された固有読取り特性により当該圧痕自動読取り装置の
自動校正を行なうようにしたため、校正精度ひいては硬
さ計測の精度を大幅に向上させることができる。
[0009] Further, based on each diagonal length of a plurality of indentations having different diagonal lengths and respective hardness display values corresponding to the indentations, a unique reading characteristic of the indentation automatic reader is incorporated in the automatic reader. In addition to calculating by the microcomputer, the unique reading characteristics are stored in the memory unit of the microcomputer, and the automatic indentation reading device is automatically calibrated by the unique reading characteristics stored in the memory unit. The accuracy of calibration and thus the accuracy of hardness measurement can be greatly improved.

【0010】さらに、固有読取り特性を函数化してマイ
クロコンピュータのメモリ部に記憶させておくことによ
り、メモリ部の簡素化,硬さ計測の迅速化が可能とな
る。
[0010] Further, by storing the intrinsic read characteristics as a function and storing them in the memory of the microcomputer, the memory can be simplified and the hardness measurement can be speeded up.

【0011】[0011]

【発明の実施の形態】以下、図面により本発明の一実施
形態としての圧痕自動読取り装置の校正方法について説
明すると、図1はその原理説明用のグラフである。
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A method for calibrating an automatic indentation reading apparatus according to an embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a graph for explaining the principle.

【0012】この実施形態は、ビッカース硬さ試験機に
付設の圧痕自動読取り装置を対象としており、図1に示
すように、校正を圧痕の対角線長さが25ミクロン,5
0ミクロン,75ミクロンおよび100ミクロンの4点
で行なうようにしている。
This embodiment is directed to an automatic indentation reading device attached to a Vickers hardness tester. As shown in FIG. 1, calibration is performed on an indentation having a diagonal length of 25 microns and 5 microns.
The measurement is performed at four points of 0 micron, 75 micron, and 100 micron.

【0013】すなわち、Hv=500のテストピースに
試験荷重を変えて、対角線長さD1〜D4がそれぞれD1
=25ミクロン,D2=50ミクロン,D3=75ミクロ
ンおよびD4=100ミクロンの4個の圧痕を形成し、
このテストピースの上記4個の圧痕を自動読取り装置で
順次読取らせる。
[0013] That is, by changing the test load to the test piece of Hv = 500, the diagonal length D 1 to D 4 are each D 1
= 25 microns, to form a D 2 = 50 microns, D 3 = 75 microns and D 4 = 100 microns four indentations,
The four indentations of the test piece are sequentially read by an automatic reading device.

【0014】なお、4個の圧痕は同一のテストピース上
に試験荷重を変えて形成することができる。また、異な
る複数のテストピース(基準硬さは同じ)に圧痕寸法の
異なる圧痕を形成するようにしてもよい。図1中の符号
a〜dは当該圧痕自動読取り装置のHv表示値を示して
いる。
The four indentations can be formed on the same test piece by changing the test load. Indentations having different indentation dimensions may be formed on a plurality of different test pieces (having the same reference hardness). Symbols a to d in FIG. 1 indicate Hv display values of the indentation automatic reading device.

【0015】圧痕の各対角線長さD1〜D4とこれらに対
応するHv表示値a〜dとに基づいて、HvとDとの関
係を示す函数 Hv=f(D) を自動読取り装置に内蔵
したマイクロコンピュータで演算する。HvとDとの関
係は、例えば図1に示すような蛇行曲線となる。この函
数 Hv=f(D) がこの自動読取り装置の固有読取り
特性である。
Based on the diagonal lengths D 1 to D 4 of the indentation and the corresponding Hv display values a to d, a function Hv = f (D) indicating the relationship between Hv and D is sent to the automatic reader. The calculation is performed by a built-in microcomputer. The relationship between Hv and D is a meandering curve as shown in FIG. 1, for example. This function Hv = f (D) is a characteristic reading characteristic of the automatic reader.

【0016】圧痕自動読取り装置による試料上の圧痕の
自動読取りの際、読取られたD値に対して上記固有読取
り特性に基づいた補正が行なわれて、Hv表示がなされ
る。すなわち、試料上の圧痕の自動読取り時に、マイコ
ロコンピュータにおいて、読取りD値に対するHv表示
が Hv=−f(D) 式で演算されて自動表示される。
At the time of automatic reading of the indentation on the sample by the indentation automatic reading device, the read D value is corrected on the basis of the above inherent reading characteristic, and the Hv is displayed. That is, when the indentation on the sample is automatically read, the Hv display for the read D value is calculated by the formula Hv = −f (D) and is automatically displayed in the micro computer.

【0017】このようにして、この実施形態では、圧痕
自動読取り装置の校正を4つの校正ポイントで行なうよ
うにしたため、従来の1点式の校正方法に比べて、計測
される硬さの値の広い範囲にわたって読取り誤差を少な
くすることができる。
As described above, in this embodiment, the calibration of the indentation automatic reading device is performed at four calibration points, so that the hardness value to be measured is smaller than the conventional one-point calibration method. Reading errors can be reduced over a wide range.

【0018】なお校正ポイントは4つに限定するもので
はなく、複数(2つ以上)ポイントであればよい。校正
ポイント数が多いほど読取り精度を高くできることはい
うまでもない。
Note that the number of calibration points is not limited to four, but may be a plurality (two or more) points. Needless to say, the reading accuracy can be increased as the number of calibration points increases.

【0019】ブリネル硬さ試験機に付設の圧痕自動読取
り装置の校正も、これと同じ要領で行なわれる。
The calibration of the automatic indentation reading device attached to the Brinell hardness tester is performed in the same manner.

【0020】[0020]

【発明の効果】以上詳述したように、本発明の圧痕自動
読取り装置の校正方法によれば、次のような効果ないし
利点が得られる。 (1) 校正ポイントが複数(2カ所以上)となるため、従
来の1点式校正方法に比べて圧痕自動読取り装置の校正
精度が向上する。 (2) 対角線長さの異なる複数の圧痕の各対角線長さと、
同各圧痕に対応する各硬さ表示値とに基づいて、当該圧
痕自動読取り装置の固有読取り特性を演算し、同固有読
取り特性により当該圧痕自動読取り装置の校正を行なう
ようにしたため、校正精度ひいては硬さ計測の精度を大
幅に向上させることができる。 (3) 固有読取り特性を函数化してマイクロコンピュータ
のメモリ部に記憶させておくことにより、メモリ部の簡
素化,硬さ計測の迅速化が可能となる。
As described above, according to the method of calibrating an automatic indentation reading apparatus of the present invention, the following effects and advantages can be obtained. (1) Since there are a plurality of (two or more) calibration points, the calibration accuracy of the automatic indentation reading apparatus is improved as compared with the conventional one-point calibration method. (2) Each diagonal length of a plurality of indentations having different diagonal lengths,
Based on the respective hardness display values corresponding to the respective indentations, the unique reading characteristics of the indentation automatic reading device are calculated, and the indentation automatic reading device is calibrated based on the inherent reading characteristics. The accuracy of hardness measurement can be greatly improved. (3) The function of the unique reading characteristic is stored in the memory of the microcomputer, and the memory can be simplified and the hardness can be quickly measured.

【図面の簡単な説明】[Brief description of the drawings]

【図1】本発明の一実施形態としての圧痕自動読取り装
置の校正方法の原理説明用グラフ。
FIG. 1 is a graph for explaining the principle of a method of calibrating an automatic indentation reading apparatus as one embodiment of the present invention.

【図2】従来の圧痕自動読取り装置の校正方法の原理説
明用グラフ。
FIG. 2 is a graph for explaining the principle of a conventional calibration method for an indentation automatic reading device.

【符号の説明】[Explanation of symbols]

D 圧痕の対角線長さ Hv ビッカース硬さ D Diagonal length of indentation Hv Vickers hardness

Claims (3)

【特許請求の範囲】[Claims] 【請求項1】 対角線長さDの圧痕を形成された硬さH
のテストピースの上記圧痕の対角線長さの読取り値に対
応する硬さとしてHを表示するように自動読取り装置を
校正する校正方法において、上記校正を、上記テストピ
ースに形成された対角線長さの異なる複数の圧痕を対象
として行なうことを特徴とする、圧痕自動読取り装置の
校正方法。
1. Hardness H formed with indentations of diagonal length D
In a calibration method for calibrating an automatic reader so as to display H as hardness corresponding to a reading of the diagonal length of the indentation of the test piece, the calibration is performed by measuring the diagonal length formed on the test piece. A method for calibrating an automatic indentation reading device, wherein the method is performed for a plurality of different indentations.
【請求項2】 上記テストピースに形成された対角線長
さの異なる複数の圧痕の各対角線長さを読取らせるとと
もに、各対角線長さと、同各対角線長さに対応した各硬
さ表示値とに基づいて、当該圧痕自動読取り装置の固有
読取り特性を同自動読取り装置に内蔵したマイクロコン
ピュータにおいて演算し、同固有読取り特性を上記マイ
クロコンピュータのメモリ部に記憶させるようにしたこ
とを特徴とする、請求項1に記載の圧痕自動読取り装置
の校正方法。
2. A diagonal length of a plurality of indentations having different diagonal lengths formed on the test piece is read, and each diagonal length and each hardness display value corresponding to the diagonal length are read. Based on the above, the unique reading characteristics of the indentation automatic reading device is calculated by a microcomputer built in the automatic reading device, and the unique reading characteristics are stored in a memory unit of the microcomputer. A method for calibrating an automatic indentation reader according to claim 1.
【請求項3】 上記固有読取り特性が函数 H=f
(D) として上記マイクロコンピュータで演算される
ことを特徴とする、請求項2に記載の圧痕自動読取り装
置の校正方法。
3. The characteristic reading characteristic is H = f
The method according to claim 2, wherein (D) is calculated by the microcomputer.
JP29945397A 1997-10-16 1997-10-16 Calibration method for automatic indentation reader Pending JPH11118691A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP29945397A JPH11118691A (en) 1997-10-16 1997-10-16 Calibration method for automatic indentation reader

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP29945397A JPH11118691A (en) 1997-10-16 1997-10-16 Calibration method for automatic indentation reader

Publications (1)

Publication Number Publication Date
JPH11118691A true JPH11118691A (en) 1999-04-30

Family

ID=17872780

Family Applications (1)

Application Number Title Priority Date Filing Date
JP29945397A Pending JPH11118691A (en) 1997-10-16 1997-10-16 Calibration method for automatic indentation reader

Country Status (1)

Country Link
JP (1) JPH11118691A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006145467A (en) * 2004-11-24 2006-06-08 Mitsutoyo Corp Repulsion type portable hardness meter
JP2014035236A (en) * 2012-08-08 2014-02-24 Shimadzu Corp Hardness testing device
CN111982728A (en) * 2020-09-21 2020-11-24 北京北方车辆集团有限公司 Calibration method of full-automatic Brinell indentation measurement system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006145467A (en) * 2004-11-24 2006-06-08 Mitsutoyo Corp Repulsion type portable hardness meter
JP2014035236A (en) * 2012-08-08 2014-02-24 Shimadzu Corp Hardness testing device
CN111982728A (en) * 2020-09-21 2020-11-24 北京北方车辆集团有限公司 Calibration method of full-automatic Brinell indentation measurement system

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