Method for detecting hardened layer shape and hardness distribution condition of heavy rail end head

A technology of hardness distribution and detection method, which is applied in the direction of specific gravity measurement, measuring device, and analysis of materials, etc. It can solve the problems of complex operation, inability to meet the rapid production of the production line, and long time consumption, and achieve simple operation, shortened debugging time, and high accuracy Effect

Inactive Publication Date: 2009-04-22
武钢集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

And each inspection requires at least 50 Vickers hardness tests to obtain the hardness distribution. The operation is complicated and time-consuming, which cannot meet the needs of rapid production on the production line.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A method for detecting the shape and hardness distribution of a hardened layer at the end of a heavy rail, the steps of which are:

[0022] 1) Polish the heavy rail end sample, and its surface roughness is 1.6 μm;

[0023] 2) Put the sample at the end of the heavy rail into a nitric alcohol solution with a concentration of 5% and wipe it for 12 seconds;

[0024] 3) Take out the sample at the end of the heavy rail, and put it into alkaline water at a temperature of 50°C for cleaning until the surface is clean;

[0025] 4) Use hot air to dry the surface of the sample at the end of the heavy rail from top to bottom, the sample is inclined at 60°, and the blowing time is 10 seconds;

[0026] 5) Obtain the image of the sample at the end of the heavy rail, and process the image with a computer.

Embodiment 2

[0028] A method for detecting the shape and hardness distribution of a hardened layer at the end of a heavy rail, the steps of which are:

[0029] 1) Polish the heavy rail end sample to a surface roughness of 0.8 μm;

[0030] 2) Put the sample at the end of the heavy rail into a nital solution with a concentration of 5% and wipe it for 13 seconds;

[0031] 3) Take out the sample at the end of the heavy rail, and put it into alkaline water at a temperature of 60°C for cleaning until the surface is clean;

[0032] 4) Use hot air to dry the surface of the sample at the end of the heavy rail from top to bottom, the sample is inclined at 75°, and the blowing time is 12 seconds;

[0033] 5) Obtain the image of the sample at the end of the heavy rail, and process the image with a computer.

Embodiment 3

[0035] A method for detecting the shape and hardness distribution of a hardened layer at the end of a heavy rail, the steps of which are:

[0036] 1) Polish the heavy rail end sample to a surface roughness of 1.0 μm;

[0037] 2) Put the sample at the end of the heavy rail into a nitric alcohol solution with a concentration of 5% and wipe it for 14 seconds;

[0038] 3) Take out the sample at the end of the heavy rail, and put it into alkaline water with a temperature of 70°C for cleaning until the surface is clean;

[0039] 4) Use hot air to dry the surface of the sample at the end of the heavy rail from top to bottom, the sample is inclined at 80°, and the blowing time is 14 seconds;

[0040] 5) Obtain the image of the sample at the end of the heavy rail, and process the image with a computer.

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Abstract

The invention relates to a method for detecting the shape of a heavy rail tip hardening layer and the distribution situation of hardness. The invention aims at solving the existing problems of complex operation and long consuming time. The method includes the steps as follows: the heavy rail tip specimen is polished to the surface roughness not more than 1.6mum; the specimen is put into 5% of nital to clean for 12-14 seconds; then the specimen is taken out and put into water containing soda at the temperature of 50 to 70 DEG C, so as to be washed until the surface is clean; and then the surface of the specimen is blow-dried from above down by hot blast for 10-15 seconds while the specimen leans for 60-90 degrees; a stereoscope and a surface source halogen lamp are used for obtaining the image of the heavy rail tip specimen; and the image is processed by a computer. The invention has the advantages of simple operation, high accuracy and detection period of only one hour, shortens the heavy rail heat treatment line debug time, and improves the heat treatment work efficiency.

Description

technical field [0001] The invention relates to a detection method, in particular to a detection method for the shape and hardness distribution of a hardened layer at the end of a heavy rail. Background technique [0002] At present, the measurement of the shape of the hardened layer at the end of the heavy rail is mainly through visual inspection and calipers, and the measurement speed is slow and the accuracy is low. Hardness distribution requires continuous Vickers hardness test on the entire sample to measure the hardness value of each point, and then obtain the hardness distribution of the entire sample after heat treatment. In order to ensure accurate Vickers hardness measurement, the sample must be polished. Moreover, each inspection requires at least 50 Vickers hardness tests to obtain the hardness distribution. The operation is complicated and time-consuming, which cannot meet the needs of rapid production on the production line. Contents of the invention [000...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/24G01N9/00
Inventor 毛传军唐因尹屈青高鹏董如泉宋木清李小杰沈克单凯军郭芳
Owner 武钢集团有限公司
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