International Standard ISO 6508-2:2015(E)
Metallic materials — Rockwell hardness test —
Part 2:
Verification and calibration of testing machines and indenters
ISO 6508 consists of the following parts under the general title Metallic materials —— Rockwell hardness test:
ISO 6508-1Metallic materials —— Rockwell hardness test Part 1: Test method
ISO 6508-2 Metallic materials —— Rockwell hardness test Part 2: Verification and calibration of testing machines and indenters
ISO 6508-3 Metallic materials —— Rockwell hardness test Part 3: Calibration of refernce blocks
Content
Foreword
1 Scope
2 Normative references
3 General conditions
4 Direct verification of the testing machine
4.1 General
4.2 Calibration and verification of the test force.
4.3 Calibration and verification of the depth-measuring system
4.4 Calibration and verification of the testing cycle
4.5 Calibration and verification of the machine hysteresis
5 Indirect verification of the testing machine
5.1 General
5.2 Procedure
5.3 Repeatability
5.4 Bias
5.5 Uncertainty of measurement
6 Calibration and verification of Rockwell hardness indenters
6.1 General
6.2 Diamond indenter
6.2.1 General
6.2.2 Direct calibration and verification of the diamond indenter
6.2.3 Indirect verification of diamond indenters
6.3 Ball indenter
6.3.1 Direct calibration and verification of the ball indenter
6.3.2 Indirect verification of the ball holder assembly
6.4 Marking
7 Intervals between direct and indirect calibrations and verifications
8 Verification report
Annex A (normative) Repeatability of testing machines
Annex B (informative) Uncertainty of measurement of the calibration results of the
hardness testing machine
Bibliography
1 Scope
This part of ISO 6508 specifies two separate methods of verification of testing machines (direct and
indirect) for determining Rockwell hardness in accordance with ISO 6508-1:2015, together with a
method for verifying Rockwell hardness indenters.
The direct verification method is used to determine whether the main parameters associated with
the machine function, such as applied force, depth measurement, and testing cycle timing, fall within
specified tolerances. The indirect verification method uses a number of calibrated reference hardness
blocks to determine how well the machine can measure a material of known hardness.
The indirect method may be used on its own for periodic routine checking of the machine in service.
If a testing machine is also to be used for other methods of hardness testing, it shall be verified
independently for each method.
This part of ISO 6508 is applicable to stationary and portable hardness testing machines.
Attention is drawn to the fact that the use of tungsten carbide composite for ball indenters is considered
to be the standard type of Rockwell indenter ball. Steel indenter balls may continue to be used only
when complying with ISO 6508-1:2015, Annex A.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
ISO 376, Metallic materials — Calibration of force-
proving instruments used for the verification of uniaxial testing machines
ISO 6507-1, Metallic materials — Vickers hardness test — Part 1: Test method
ISO 6508-1:2015, Metallic materials — Rockwell hardness test — Part 1: Test method
ISO 6508-3:2015, Metallic materials — Rockwell hardness test — Part 3: Calibration of
reference blocks
相關(guān)標(biāo)準(zhǔn)
國(guó)家標(biāo)準(zhǔn)GB/T 230.2-2012《金屬材料 洛氏硬度試驗(yàn) 第2部分：硬度計(jì)的檢驗(yàn)與校準(zhǔn)》
本標(biāo)準(zhǔn)使用重新起草法修改采用國(guó)際標(biāo)準(zhǔn)ISO6508-2:2005《金屬材料 洛氏硬度試驗(yàn) 第2部分:硬度計(jì)(A、B、C、D、E、F、G、H、K、N、T標(biāo)尺)的檢驗(yàn)與校準(zhǔn)》(第二版),在文本結(jié)構(gòu)和技術(shù)內(nèi)容方面與ISO6508-2:2005一致。
本標(biāo)準(zhǔn)與ISO6508-2:2005的技術(shù)性差異及其原因如下:
—— 刪除了ISO6508-2:2005的前言,重新編寫了前言;
—— 關(guān)于規(guī)范性引用文件,本標(biāo)準(zhǔn)做了具有技術(shù)性差異的調(diào)整,以適應(yīng)我國(guó)的技術(shù)條件,調(diào)整的內(nèi)容集中反映在第2章“規(guī)范性引用文件”中,具體調(diào)整如下:
● 用修改采用國(guó)際標(biāo)準(zhǔn)的GB/T230.1代替ISO6508-1(見第1章、4.3.1.2、4.5、5.2.2和B.1.1);
● 用修改采用國(guó)際標(biāo)準(zhǔn)的GB/T230.3—2012代替ISO6508-3:2005(見4.3.1.2和5.1);
● 用修改采用國(guó)際標(biāo)準(zhǔn)的GB/T4340.1代替ISO6507-1(見4.3.2.3.2和4.3.2.3.3);
● 用等同采用國(guó)際標(biāo)準(zhǔn)的GB/T13634代替ISO376(見4.2.3)。
—— 修改了表1的內(nèi)容,并規(guī)范了表中所列“標(biāo)尺”和“洛氏硬度單位”的表示方式;修改了表5中、圖A.1和圖A.2的曲線上“示值相對(duì)重復(fù)性指標(biāo)”的表示方式;
—— 增加了公式(3)、符號(hào)“rrel”和“c”以及有關(guān)這些符號(hào)的說明;原公式(3)的序號(hào)改為公式(4);
—— 改正了附錄B中及表B.1、表B.5、表B.6、表B.8和表B.9中一些錯(cuò)誤的符號(hào)、計(jì)算結(jié)果和數(shù)據(jù),并在做過改正的地方用下劃線注明;
—— 規(guī)范了附錄B中向公式里代入數(shù)值的一些計(jì)算式的表達(dá)方法;
—— 將附錄B的公式(B.10)、公式(B.12)和表B.9中的符號(hào)“b”用符號(hào)“E”替換;
—— 刪除了參考文獻(xiàn)。
本標(biāo)準(zhǔn)與ISO6508-2:2005相比存在技術(shù)性差異,這些差異涉及的條款已通過在其外側(cè)頁邊空白位置的垂直單線(│)進(jìn)行了標(biāo)示。
本標(biāo)準(zhǔn)還做了下列編輯性修改:
—— 將“ISO6508的本標(biāo)準(zhǔn)”一詞改為“本標(biāo)準(zhǔn)”;
—— 用中文的小數(shù)點(diǎn)符號(hào)“.”代替英文的小數(shù)點(diǎn)符號(hào)“,”。
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