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Hardness test method

A detection method and hardness technology, applied in the direction of testing material hardness, etc., can solve the problems of serious temperature drift, small linear working range, unsatisfactory, etc., and achieve the effect of expanding the detection range and improving the detection accuracy

Inactive Publication Date: 2010-11-24
BAOSHAN IRON & STEEL CO LTD
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Problems solved by technology

But even so, according to the theory and application results, the linear compensation range of this compensation method is still quite narrow, and the actual effective compensation range is at most about 60HB, which cannot meet the requirement of a working range of more than 100 HB in production. , the linear working range of the whole set of instruments is too small;
[0018] 3.2) Serious temperature drift

Method used

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Embodiment

[0066] First, calibrate the working curve of the hardness tester (that is, the indentation depth-hardness value curve, HB=f(t)): After the force system generates a force of 3000 kg, it is applied to the probe of the hardness tester. Under the action of 3000 kg force, the corresponding indentation is produced on the tested test block. The depth of the indentation varies according to the hardness value. Generally, eight test blocks with different hardness values ​​are used to form the working curve of the hardness tester. In this example, the hardness value of the hardness test block is HB592 to HB186, the working range of the hardness tester is 406HB, the corresponding indentation depth is 0.16mm-0.51mm, and the variation is 0.35mm. The corresponding parameters are listed in Table 1 below.

[0067] Table 1. Parameter relationship between the components of the hardness tester

[0068]

[0069]

[0070] These signals detected by the hardness probe can be amplified by the p...

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Abstract

The invention discloses a hardness test method. The hardness test method comprises the following steps of: firstly, demarcating and drawing a hardometer working curve (namely an indentation depth-hardness value curve) by using test blocks with different hardness and using a VB software program; secondly, testing a workpiece to be tested; and substituting a tested indentation depth value into the hardometer working curve to obtain the hardness value of the workpiece to be tested. The technical scheme has the advantages of greatly improving the test precision and the stability, enlarging the test range and effectively monitoring the whole working process of equipment in a dynamic state to ensure that a hardometer can meet actual needs of automated large-scale production.

Description

technical field [0001] The invention relates to the relevant technical field of hardness detection, especially for the hardness tester with high precision and large detection range. The electrical signal of the indentation depth is converted into a digital signal by analog-to-digital conversion, and then the digital signal is subjected to nonlinear conversion processing to obtain the indentation depth value, and the hardness value of the standard test block is obtained through calculation. Background technique [0002] The hardness tester used in the steel production line is an instrument for online measurement of the hardness value of the product on the drill pipe production line. Since the hardness value reflects an important physical parameter of the pipe after a series of previous processes such as heat treatment, it directly affects the resistance to hydrogen sulfide. The quality of high-grade steel products such as corrosion pipes, anti-oxidation pipes, and high-resist...

Claims

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Application Information

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IPC IPC(8): G01N3/42
Inventor 吴吉华林培奋韩莉王品华
Owner BAOSHAN IRON & STEEL CO LTD
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