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Method for calibrating Rockwell hardometer

A technology of Rockwell hardness tester and pure copper, which is applied in the direction of testing the hardness of materials, etc., can solve the problems of poor accuracy and large deviation of indication error value, achieve the effect of accurate calibration and avoid measurement error

Inactive Publication Date: 2017-10-13
安吉元融仪器仪表检测有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Under specified conditions, in order to determine the relationship between the quantity value indicated by the measuring instrument or measuring system, or the quantity value represented by the physical measuring tool or reference material, and the corresponding quantity value reproduced by the standard, currently The accuracy of the calibration method for the Rockwell hardness tester is poor, and the obtained indication error value has a large deviation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A method of calibrating a Rockwell hardness tester, comprising the steps of:

[0021] (1) Select a cylindrical pure copper test block, and use a grinding wheel to roughly grind the two ends of the pure copper test block. After rough grinding, use 200#, 400#, 600# and 800# dry sandpaper to polish the pure copper test piece in turn. At both ends of the block, polish the polished pure copper test block; (2) clean the top surface of the lead screw and the upper and lower end surfaces of the workbench; (3) place the workbench on the lead screw platform; (4) put the pure copper Place the test block horizontally on the workbench, rotate the handwheel to make the workbench rise slowly and squeeze the indenter until the small pointer in the indicator plate points to the red dot and then stop applying force to the handwheel; (5) Rotate the indicator shell to make the indication The big pointer in the disk completely coincides with the long engraved line between C and B; (6) Pull ...

Embodiment 2

[0023] A method for calibrating a Rockwell hardness tester, comprising the steps of: (1) rough grinding the two ends of a pure copper test block with an emery wheel, and using dry sandpapers of 200#, 400#, 600# and 800# after the rough grinding Grind both ends of the pure copper test block in turn, and polish the polished pure copper test block; (2) clean the top surface of the lead screw and the upper and lower end surfaces of the workbench; (3) place the workbench on the lead screw platform; ( 4) Place the pure copper test block horizontally on the workbench, rotate the handwheel to make the workbench rise slowly and squeeze the indenter until the small pointer in the indicator plate points to the red dot and stop applying force to the handwheel; (5) Rotate the indicator (6) Pull the loading handle to apply the main test force, and the large pointer of the indicator rotates counterclockwise. When the pointer rotates After stopping, the unloading handle can be pushed back to ...

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Abstract

The invention discloses a method for calibrating a Rockwell hardometer. The method comprises the following steps that firstly, a cylindrical fine copper test block is selected, the two ends of the fine copper test block are subjected to coarse grinding by using a grinding wheel, the two ends of the fine copper test block obtained after coarse grinding are sequentially polished with 200 # dry abrasive paper, 400 # dry abrasive paper, 600 # dry abrasive paper and800 # dry abrasive paper, and the fine copper test block after polishing is subjected to buffing; secondly, the top face of a lead screw and the upper and lower end faces of a working table are wiped up; thirdly, the working table is placed on a lead screw table; fourthly, the fine copper test block is horizontally placed on the working table, a hand wheel is rotated so that the working table slowly rise, a pressure head is extruded, and force application is stopped until a small pointer in an indicating dial points to a red dot. In the method, by preparing the fine copper test block, the hardness numbers on a plurality of measurement points on the fine copper test block are measured by using the Rockwell hardometer, the average value of the hardness numbers is calculated, the average value is compared with the standard hardness number of finer copper, and the indication error can be obtained; while the average value is calculated, the maximum value and the minimum value are removed, so that the measuring errors are effectively avoided, and calibration is more accurate.

Description

technical field [0001] The invention belongs to the technical field of instrument calibration, in particular to a method for calibrating a Rockwell hardness tester. Background technique [0002] Calibration refers to checking machines, instruments, etc. to make them accurate. Under specified conditions, in order to determine the relationship between the quantity value indicated by the measuring instrument or measuring system, or the quantity value represented by the physical measuring instrument or reference material, and the corresponding quantity value reproduced by the standard, currently The accuracy of the calibration method for the Rockwell hardness tester is poor, and the deviation of the indication error value obtained is relatively large. Contents of the invention [0003] In order to overcome the deficiencies of the prior art, the invention provides a method for calibrating a Rockwell hardness tester with high precision. [0004] In order to achieve the above o...

Claims

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Application Information

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IPC IPC(8): G01N3/44
CPCG01N3/44
Inventor 张明
Owner 安吉元融仪器仪表检测有限公司
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