Anticorrosive wear-resistant spiral dog nail and its production process

A technology of spiral spikes and production process, which is applied to metal material coating process, roads, tracks, etc., can solve the problems of labor, high cost, time-consuming, etc., and achieve the effect of saving labor, good anti-corrosion performance and reducing cost.

Inactive Publication Date: 2004-11-24
福建郭坑铁路工务设备有限公司
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  • Abstract
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AI Technical Summary

Problems solved by technology

Although this method of replacing spikes is relatively labor-saving and does not damage the sleepers, it still requires railway patrol workers to check frequently and replace them in time. With power supply and special equipment
Therefore, there are still problems such as laborious, time-consuming, and high cost, and it is not suitable for places without power supply

Method used

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  • Anticorrosive wear-resistant spiral dog nail and its production process

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Experimental program
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Effect test

Embodiment

[0033] The heat treatment process of the anti-corrosion and wear-resistant spiral road stud of the present invention is as follows: spiral road stud blank-blank cleaning treatment-into the furnace-heat treatment-cooling out of the furnace-oiling:

[0034] Spiral spike blanks: several spiral spikes and matching nuts are made of Q235A carbon structural steel. High .25 special thread;

[0035] Blank cleaning treatment: clean up the oil and impurities on the surface of spiral spikes and nut blanks to avoid affecting the heat treatment layer;

[0036] Furnace entry: Hang clean spiral spikes and nuts in a closed heat treatment furnace. The gas composition and ratio in the heat treatment furnace are: ammonia: carbon dioxide: air = 100:5:15; the temperature is 590°C; the furnace pressure : 700Pa; then keep warm for heat treatment for 2.5 hours.

[0037] Cool down and take out of the furnace; when the power is turned off and the furnace temperature is lowered to 500°C, the ammonia ga...

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Abstract

The anticorrosive wear-resistant spiral dog nail is made of Q235A carbon steel and has composite surface infiltration layer of Fe3O4 and Fe2-3(N-C) in thickness over 18 micron and surface hardness of HV660-HV834. The production process includes the steps of machining dog nail blank, cleaning the blank, heat treatment in furnace and cooling in the furnace, and the atmosphere inside the furnace including ammonia, CO2 and N2 in certain proportion. After the surface treatment, the dog nail has continuous, compact and homogeneous surface protecting layer, excellent anticorrosive capacity and greatly prolonged service life similar to that of sleeper.

Description

technical field [0001] The invention relates to a screw spike suitable for railway concrete sleepers, which belongs to the production field of railway construction accessories. Background technique [0002] At present, the reinforced concrete sleepers laid on my country's railway lines have accounted for a considerable proportion (about 70%). A large number of railway lines use reinforced concrete sleepers, sleeper boards and concrete integral track beds, especially the lines in tunnels have all adopted integral track beds. However, due to long-term exposure, wear and other reasons, the rails and their accessories are seriously corroded, especially in tunnels and other humid places, the corrosion is more serious, and the spiral spikes anchored by sulfur cement slurry are the first to bear the brunt. Therefore, in order to ensure driving safety, corroded spiral spikes need to be replaced at any time. However, the existing methods or equipment for extracting spiral spikes cann...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C8/26E01B9/06
Inventor 江勇黄新民郑荣琰
Owner 福建郭坑铁路工务设备有限公司
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