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Method for testing steel forgings superficial hardening layer distribution

A hardened layer and steel technology, applied in the field of detection, can solve the problems of large surface damage and limited range of steel forgings, and achieve the effect of comprehensive detection range

Active Publication Date: 2008-11-12
CRRC QISHUYAN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has great damage to the surface of steel forgings, and can only partially detect the surface of steel forgings, and the scope is limited

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] This embodiment is to detect the distribution of the hardened layer on the surface of the gear, and the method is as follows:

[0015] ①Put the quenched gear into the first cleaning tank equipped with steel cleaning agent as the previous cleaning solution, and soak it at 80°C for 5 minutes, so as to remove the sludge and oil stains on the surface of the gear. Described steel cleaning agent is the QW-122 steel cleaning agent produced by Guangzhou Qiwei Chemical Co., Ltd.

[0016] ②Place the soaked gear on the workbench and spray it with water to remove the steel cleaning agent remaining on the gear surface.

[0017] ③Spray nitrous acid with a mass fraction of 6% on the washed gear surface to make the nitrous acid react with the gear surface to blacken the gear surface.

[0018] If the entire gear surface turns black, no soft spots were found in this step.

[0019] If there are portions of the gear surface that are not blackened, these are soft spots, and these soft spo...

Embodiment 2

[0026] This embodiment is to detect the distribution of the hardened layer on the surface of the camshaft, the method is as follows:

[0027] ①Put the quenched camshaft into the first cleaning tank filled with steel cleaning agent as the previous cleaning solution, and soak it at 50°C for 12 minutes to remove the sludge and oil stains on the surface of the camshaft.

[0028] ②Place the soaked camshaft on the workbench and spray and rinse it with water to remove the steel cleaning agent remaining on the surface of the camshaft.

[0029] ③Spray nitric acid with a mass fraction of 5% on the surface of the flushed camshaft to make the nitric acid react with the surface of the camshaft to blacken the surface of the camshaft.

[0030] If the entire camshaft surface turns black, no soft spots were found in this step.

[0031] If there are portions of the camshaft surface that are not blackened, these are soft spots, and these soft spots are marked.

[0032] ④ Then spray hydrochlori...

Embodiment 3

[0038] This embodiment is to detect the distribution of the hardened layer on the surface of the pin shaft, the method is as follows:

[0039] ① Put the quenched pin shaft into the first cleaning tank equipped with steel cleaning agent as the previous cleaning solution, and soak it at 40°C for 15 minutes to remove the sludge and oil stains on the surface of the pin shaft.

[0040] ②Place the soaked pin shaft on the workbench, spray and rinse with water, so as to remove the steel cleaning agent remaining on the pin shaft surface.

[0041] ③Spray hydrochloric acid with a mass fraction of 5% on the surface of the washed pin shaft to make the hydrochloric acid react with the surface of the pin shaft to blacken the surface of the pin shaft.

[0042] If the entire pin surface turns black, no soft spots were found in this step.

[0043] If there are portions of the pin surface that do not turn black, these are soft spots, and these soft spots are marked.

[0044] ④Subsequently spra...

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PUM

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Abstract

The invention discloses a method for detecting distribution of the hardening layer on the surface of an iron forge piece, comprising the steps of 1) immersing the quenched iron forge piece into a first cleaning tank, 2) showering the iron forge piece with water after the immersion, 3) spraying an inorganic acid (A) onto the surface of the iron forge piece for a reaction to blacken the surface, and determining unblackened portiona as soft points, 4) spraying an inorganic acid (B) onto the surface again for another reaction to change the color of the surface into grey, and determining portions unchanged into grey as soft points, wherein the inorganic aid (B) is different from the inorganic acid (A), 5) immersing the iron forge piece into a second cleaning tank, and finally showering the piece with water. The detection is comprehensive, and has no harm to the surface of the iron forge piece.

Description

technical field [0001] The invention relates to a detection method, in particular to a method for detecting the distribution of a hardened layer on the surface of a steel forging. Background technique [0002] After the steel forging is quenched, it is necessary to detect the distribution of the hardened layer on the surface to detect whether there is a soft spot (that is, the part whose hardness does not meet the requirements). At present, the hardness test method or the file cutting method are used to detect the distribution of the surface hardened layer. [0003] The hardness test method refers to using a hardness tester to test the hardness on the surface of the steel forging, so as to test the hardness value of this part. Although this method can intuitively obtain the hardness value of each part of the surface, so as to find out whether there are soft spots, but This method will leave a hardened depression on the surface of the steel forging, which will damage the sur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/78G01N1/32
Inventor 潘晓松
Owner CRRC QISHUYAN CO LTD
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